diff options
Diffstat (limited to 'src/civetweb/src/third_party/duktape-1.8.0/src-separate/duk_js_executor.c')
| -rw-r--r-- | src/civetweb/src/third_party/duktape-1.8.0/src-separate/duk_js_executor.c | 4515 |
1 files changed, 4515 insertions, 0 deletions
diff --git a/src/civetweb/src/third_party/duktape-1.8.0/src-separate/duk_js_executor.c b/src/civetweb/src/third_party/duktape-1.8.0/src-separate/duk_js_executor.c new file mode 100644 index 000000000..86b0ae0bd --- /dev/null +++ b/src/civetweb/src/third_party/duktape-1.8.0/src-separate/duk_js_executor.c @@ -0,0 +1,4515 @@ +/* + * Ecmascript bytecode executor. + */ + +#include "duk_internal.h" + +/* + * Local declarations. + */ + +DUK_LOCAL_DECL void duk__js_execute_bytecode_inner(duk_hthread *entry_thread, duk_size_t entry_callstack_top); + +/* + * Arithmetic, binary, and logical helpers. + * + * Note: there is no opcode for logical AND or logical OR; this is on + * purpose, because the evalution order semantics for them make such + * opcodes pretty pointless: short circuiting means they are most + * comfortably implemented as jumps. However, a logical NOT opcode + * is useful. + * + * Note: careful with duk_tval pointers here: they are potentially + * invalidated by any DECREF and almost any API call. It's still + * preferable to work without making a copy but that's not always + * possible. + */ + +DUK_LOCAL duk_double_t duk__compute_mod(duk_double_t d1, duk_double_t d2) { + /* + * Ecmascript modulus ('%') does not match IEEE 754 "remainder" + * operation (implemented by remainder() in C99) but does seem + * to match ANSI C fmod(). + * + * Compare E5 Section 11.5.3 and "man fmod". + */ + + return (duk_double_t) DUK_FMOD((double) d1, (double) d2); +} + +DUK_LOCAL void duk__vm_arith_add(duk_hthread *thr, duk_tval *tv_x, duk_tval *tv_y, duk_small_uint_fast_t idx_z) { + /* + * Addition operator is different from other arithmetic + * operations in that it also provides string concatenation. + * Hence it is implemented separately. + * + * There is a fast path for number addition. Other cases go + * through potentially multiple coercions as described in the + * E5 specification. It may be possible to reduce the number + * of coercions, but this must be done carefully to preserve + * the exact semantics. + * + * E5 Section 11.6.1. + * + * Custom types also have special behavior implemented here. + */ + + duk_context *ctx = (duk_context *) thr; + duk_double_union du; + + DUK_ASSERT(thr != NULL); + DUK_ASSERT(ctx != NULL); + DUK_ASSERT(tv_x != NULL); /* may be reg or const */ + DUK_ASSERT(tv_y != NULL); /* may be reg or const */ + DUK_ASSERT_DISABLE(idx_z >= 0); /* unsigned */ + DUK_ASSERT((duk_uint_t) idx_z < (duk_uint_t) duk_get_top(ctx)); + + /* + * Fast paths + */ + +#if defined(DUK_USE_FASTINT) + if (DUK_TVAL_IS_FASTINT(tv_x) && DUK_TVAL_IS_FASTINT(tv_y)) { + duk_int64_t v1, v2, v3; + duk_int32_t v3_hi; + duk_tval *tv_z; + + /* Input values are signed 48-bit so we can detect overflow + * reliably from high bits or just a comparison. + */ + + v1 = DUK_TVAL_GET_FASTINT(tv_x); + v2 = DUK_TVAL_GET_FASTINT(tv_y); + v3 = v1 + v2; + v3_hi = (duk_int32_t) (v3 >> 32); + if (DUK_LIKELY(v3_hi >= -0x8000LL && v3_hi <= 0x7fffLL)) { + tv_z = thr->valstack_bottom + idx_z; + DUK_TVAL_SET_FASTINT_UPDREF(thr, tv_z, v3); /* side effects */ + return; + } else { + /* overflow, fall through */ + ; + } + } +#endif /* DUK_USE_FASTINT */ + + if (DUK_TVAL_IS_NUMBER(tv_x) && DUK_TVAL_IS_NUMBER(tv_y)) { + duk_tval *tv_z; + + du.d = DUK_TVAL_GET_NUMBER(tv_x) + DUK_TVAL_GET_NUMBER(tv_y); + DUK_DBLUNION_NORMALIZE_NAN_CHECK(&du); + DUK_ASSERT(DUK_DBLUNION_IS_NORMALIZED(&du)); + + tv_z = thr->valstack_bottom + idx_z; + DUK_TVAL_SET_NUMBER_UPDREF(thr, tv_z, du.d); /* side effects */ + return; + } + + /* + * Slow path: potentially requires function calls for coercion + */ + + duk_push_tval(ctx, tv_x); + duk_push_tval(ctx, tv_y); + duk_to_primitive(ctx, -2, DUK_HINT_NONE); /* side effects -> don't use tv_x, tv_y after */ + duk_to_primitive(ctx, -1, DUK_HINT_NONE); + + /* As a first approximation, buffer values are coerced to strings + * for addition. This means that adding two buffers currently + * results in a string. + */ + if (duk_check_type_mask(ctx, -2, DUK_TYPE_MASK_STRING | DUK_TYPE_MASK_BUFFER) || + duk_check_type_mask(ctx, -1, DUK_TYPE_MASK_STRING | DUK_TYPE_MASK_BUFFER)) { + duk_to_string(ctx, -2); + duk_to_string(ctx, -1); + duk_concat(ctx, 2); /* [... s1 s2] -> [... s1+s2] */ + duk_replace(ctx, (duk_idx_t) idx_z); /* side effects */ + } else { + duk_double_t d1, d2; + + d1 = duk_to_number(ctx, -2); + d2 = duk_to_number(ctx, -1); + DUK_ASSERT(duk_is_number(ctx, -2)); + DUK_ASSERT(duk_is_number(ctx, -1)); + DUK_ASSERT_DOUBLE_IS_NORMALIZED(d1); + DUK_ASSERT_DOUBLE_IS_NORMALIZED(d2); + + du.d = d1 + d2; + DUK_DBLUNION_NORMALIZE_NAN_CHECK(&du); + DUK_ASSERT(DUK_DBLUNION_IS_NORMALIZED(&du)); + + duk_pop_2(ctx); + duk_push_number(ctx, du.d); + duk_replace(ctx, (duk_idx_t) idx_z); /* side effects */ + } +} + +DUK_LOCAL void duk__vm_arith_binary_op(duk_hthread *thr, duk_tval *tv_x, duk_tval *tv_y, duk_idx_t idx_z, duk_small_uint_fast_t opcode) { + /* + * Arithmetic operations other than '+' have number-only semantics + * and are implemented here. The separate switch-case here means a + * "double dispatch" of the arithmetic opcode, but saves code space. + * + * E5 Sections 11.5, 11.5.1, 11.5.2, 11.5.3, 11.6, 11.6.1, 11.6.2, 11.6.3. + */ + + duk_context *ctx = (duk_context *) thr; + duk_tval *tv_z; + duk_double_t d1, d2; + duk_double_union du; + + DUK_ASSERT(thr != NULL); + DUK_ASSERT(ctx != NULL); + DUK_ASSERT(tv_x != NULL); /* may be reg or const */ + DUK_ASSERT(tv_y != NULL); /* may be reg or const */ + DUK_ASSERT_DISABLE(idx_z >= 0); /* unsigned */ + DUK_ASSERT((duk_uint_t) idx_z < (duk_uint_t) duk_get_top(ctx)); + +#if defined(DUK_USE_FASTINT) + if (DUK_TVAL_IS_FASTINT(tv_x) && DUK_TVAL_IS_FASTINT(tv_y)) { + duk_int64_t v1, v2, v3; + duk_int32_t v3_hi; + + v1 = DUK_TVAL_GET_FASTINT(tv_x); + v2 = DUK_TVAL_GET_FASTINT(tv_y); + + switch (opcode) { + case DUK_OP_SUB: { + v3 = v1 - v2; + break; + } + case DUK_OP_MUL: { + /* Must ensure result is 64-bit (no overflow); a + * simple and sufficient fast path is to allow only + * 32-bit inputs. Avoid zero inputs to avoid + * negative zero issues (-1 * 0 = -0, for instance). + */ + if (v1 >= -0x80000000LL && v1 <= 0x7fffffffLL && v1 != 0 && + v2 >= -0x80000000LL && v2 <= 0x7fffffffLL && v2 != 0) { + v3 = v1 * v2; + } else { + goto skip_fastint; + } + break; + } + case DUK_OP_DIV: { + /* Don't allow a zero divisor. Fast path check by + * "verifying" with multiplication. Also avoid zero + * dividend to avoid negative zero issues (0 / -1 = -0 + * for instance). + */ + if (v1 == 0 || v2 == 0) { + goto skip_fastint; + } + v3 = v1 / v2; + if (v3 * v2 != v1) { + goto skip_fastint; + } + break; + } + case DUK_OP_MOD: { + /* Don't allow a zero divisor. Restrict both v1 and + * v2 to positive values to avoid compiler specific + * behavior. + */ + if (v1 < 1 || v2 < 1) { + goto skip_fastint; + } + v3 = v1 % v2; + DUK_ASSERT(v3 >= 0); + DUK_ASSERT(v3 < v2); + DUK_ASSERT(v1 - (v1 / v2) * v2 == v3); + break; + } + default: { + DUK_UNREACHABLE(); + goto skip_fastint; + } + } + + v3_hi = (duk_int32_t) (v3 >> 32); + if (DUK_LIKELY(v3_hi >= -0x8000LL && v3_hi <= 0x7fffLL)) { + tv_z = thr->valstack_bottom + idx_z; + DUK_TVAL_SET_FASTINT_UPDREF(thr, tv_z, v3); /* side effects */ + return; + } + /* fall through if overflow etc */ + } + skip_fastint: +#endif /* DUK_USE_FASTINT */ + + if (DUK_TVAL_IS_NUMBER(tv_x) && DUK_TVAL_IS_NUMBER(tv_y)) { + /* fast path */ + d1 = DUK_TVAL_GET_NUMBER(tv_x); + d2 = DUK_TVAL_GET_NUMBER(tv_y); + } else { + duk_push_tval(ctx, tv_x); + duk_push_tval(ctx, tv_y); + d1 = duk_to_number(ctx, -2); /* side effects */ + d2 = duk_to_number(ctx, -1); + DUK_ASSERT(duk_is_number(ctx, -2)); + DUK_ASSERT(duk_is_number(ctx, -1)); + DUK_ASSERT_DOUBLE_IS_NORMALIZED(d1); + DUK_ASSERT_DOUBLE_IS_NORMALIZED(d2); + duk_pop_2(ctx); + } + + switch (opcode) { + case DUK_OP_SUB: { + du.d = d1 - d2; + break; + } + case DUK_OP_MUL: { + du.d = d1 * d2; + break; + } + case DUK_OP_DIV: { + du.d = d1 / d2; + break; + } + case DUK_OP_MOD: { + du.d = duk__compute_mod(d1, d2); + break; + } + default: { + DUK_UNREACHABLE(); + du.d = DUK_DOUBLE_NAN; /* should not happen */ + break; + } + } + + /* important to use normalized NaN with 8-byte tagged types */ + DUK_DBLUNION_NORMALIZE_NAN_CHECK(&du); + DUK_ASSERT(DUK_DBLUNION_IS_NORMALIZED(&du)); + + tv_z = thr->valstack_bottom + idx_z; + DUK_TVAL_SET_NUMBER_UPDREF(thr, tv_z, du.d); /* side effects */ +} + +DUK_LOCAL void duk__vm_bitwise_binary_op(duk_hthread *thr, duk_tval *tv_x, duk_tval *tv_y, duk_small_uint_fast_t idx_z, duk_small_uint_fast_t opcode) { + /* + * Binary bitwise operations use different coercions (ToInt32, ToUint32) + * depending on the operation. We coerce the arguments first using + * ToInt32(), and then cast to an 32-bit value if necessary. Note that + * such casts must be correct even if there is no native 32-bit type + * (e.g., duk_int32_t and duk_uint32_t are 64-bit). + * + * E5 Sections 11.10, 11.7.1, 11.7.2, 11.7.3 + */ + + duk_context *ctx = (duk_context *) thr; + duk_tval *tv_z; + duk_int32_t i1, i2, i3; + duk_uint32_t u1, u2, u3; +#if defined(DUK_USE_FASTINT) + duk_int64_t fi3; +#else + duk_double_t d3; +#endif + + DUK_ASSERT(thr != NULL); + DUK_ASSERT(ctx != NULL); + DUK_ASSERT(tv_x != NULL); /* may be reg or const */ + DUK_ASSERT(tv_y != NULL); /* may be reg or const */ + DUK_ASSERT_DISABLE(idx_z >= 0); /* unsigned */ + DUK_ASSERT((duk_uint_t) idx_z < (duk_uint_t) duk_get_top(ctx)); + +#if defined(DUK_USE_FASTINT) + if (DUK_TVAL_IS_FASTINT(tv_x) && DUK_TVAL_IS_FASTINT(tv_y)) { + i1 = (duk_int32_t) DUK_TVAL_GET_FASTINT_I32(tv_x); + i2 = (duk_int32_t) DUK_TVAL_GET_FASTINT_I32(tv_y); + } + else +#endif /* DUK_USE_FASTINT */ + { + duk_push_tval(ctx, tv_x); + duk_push_tval(ctx, tv_y); + i1 = duk_to_int32(ctx, -2); + i2 = duk_to_int32(ctx, -1); + duk_pop_2(ctx); + } + + switch (opcode) { + case DUK_OP_BAND: { + i3 = i1 & i2; + break; + } + case DUK_OP_BOR: { + i3 = i1 | i2; + break; + } + case DUK_OP_BXOR: { + i3 = i1 ^ i2; + break; + } + case DUK_OP_BASL: { + /* Signed shift, named "arithmetic" (asl) because the result + * is signed, e.g. 4294967295 << 1 -> -2. Note that result + * must be masked. + */ + + u2 = ((duk_uint32_t) i2) & 0xffffffffUL; + i3 = (duk_int32_t) (((duk_uint32_t) i1) << (u2 & 0x1fUL)); /* E5 Section 11.7.1, steps 7 and 8 */ + i3 = i3 & ((duk_int32_t) 0xffffffffUL); /* Note: left shift, should mask */ + break; + } + case DUK_OP_BASR: { + /* signed shift */ + + u2 = ((duk_uint32_t) i2) & 0xffffffffUL; + i3 = i1 >> (u2 & 0x1fUL); /* E5 Section 11.7.2, steps 7 and 8 */ + break; + } + case DUK_OP_BLSR: { + /* unsigned shift */ + + u1 = ((duk_uint32_t) i1) & 0xffffffffUL; + u2 = ((duk_uint32_t) i2) & 0xffffffffUL; + + /* special result value handling */ + u3 = u1 >> (u2 & 0x1fUL); /* E5 Section 11.7.2, steps 7 and 8 */ +#if defined(DUK_USE_FASTINT) + fi3 = (duk_int64_t) u3; + goto fastint_result_set; +#else + d3 = (duk_double_t) u3; + goto result_set; +#endif + } + default: { + DUK_UNREACHABLE(); + i3 = 0; /* should not happen */ + break; + } + } + +#if defined(DUK_USE_FASTINT) + /* Result is always fastint compatible. */ + /* XXX: Set 32-bit result (but must then handle signed and + * unsigned results separately). + */ + fi3 = (duk_int64_t) i3; + + fastint_result_set: + tv_z = thr->valstack_bottom + idx_z; + DUK_TVAL_SET_FASTINT_UPDREF(thr, tv_z, fi3); /* side effects */ +#else + d3 = (duk_double_t) i3; + + result_set: + DUK_ASSERT(!DUK_ISNAN(d3)); /* 'd3' is never NaN, so no need to normalize */ + DUK_ASSERT_DOUBLE_IS_NORMALIZED(d3); /* always normalized */ + + tv_z = thr->valstack_bottom + idx_z; + DUK_TVAL_SET_NUMBER_UPDREF(thr, tv_z, d3); /* side effects */ +#endif +} + +/* In-place unary operation. */ +DUK_LOCAL void duk__vm_arith_unary_op(duk_hthread *thr, duk_tval *tv_x, duk_idx_t idx_x, duk_small_uint_fast_t opcode) { + /* + * Arithmetic operations other than '+' have number-only semantics + * and are implemented here. The separate switch-case here means a + * "double dispatch" of the arithmetic opcode, but saves code space. + * + * E5 Sections 11.5, 11.5.1, 11.5.2, 11.5.3, 11.6, 11.6.1, 11.6.2, 11.6.3. + */ + + duk_context *ctx = (duk_context *) thr; + duk_double_t d1; + duk_double_union du; + + DUK_ASSERT(thr != NULL); + DUK_ASSERT(ctx != NULL); + DUK_ASSERT(opcode == DUK_EXTRAOP_UNM || opcode == DUK_EXTRAOP_UNP); + DUK_ASSERT(tv_x != NULL); + DUK_ASSERT(idx_x >= 0); + +#if defined(DUK_USE_FASTINT) + if (DUK_TVAL_IS_FASTINT(tv_x)) { + duk_int64_t v1, v2; + + v1 = DUK_TVAL_GET_FASTINT(tv_x); + if (opcode == DUK_EXTRAOP_UNM) { + /* The smallest fastint is no longer 48-bit when + * negated. Positive zero becames negative zero + * (cannot be represented) when negated. + */ + if (DUK_LIKELY(v1 != DUK_FASTINT_MIN && v1 != 0)) { + v2 = -v1; + DUK_TVAL_SET_FASTINT(tv_x, v2); /* no refcount changes */ + return; + } + } else { + /* ToNumber() for a fastint is a no-op. */ + DUK_ASSERT(opcode == DUK_EXTRAOP_UNP); + return; + } + /* fall through if overflow etc */ + } +#endif /* DUK_USE_FASTINT */ + + if (!DUK_TVAL_IS_NUMBER(tv_x)) { + duk_to_number(ctx, idx_x); /* side effects, perform in-place */ + tv_x = DUK_GET_TVAL_POSIDX(ctx, idx_x); + DUK_ASSERT(tv_x != NULL); + DUK_ASSERT(DUK_TVAL_IS_NUMBER(tv_x)); + } + + d1 = DUK_TVAL_GET_NUMBER(tv_x); + if (opcode == DUK_EXTRAOP_UNM) { + du.d = -d1; + } else { + /* ToNumber() for a double is a no-op. */ + DUK_ASSERT(opcode == DUK_EXTRAOP_UNP); + du.d = d1; + } + DUK_DBLUNION_NORMALIZE_NAN_CHECK(&du); /* mandatory if du.d is a NaN */ + + DUK_ASSERT(DUK_DBLUNION_IS_NORMALIZED(&du)); + +#if defined(DUK_USE_FASTINT) + /* Unary plus is used to force a fastint check, so must include + * downgrade check. + */ + DUK_TVAL_SET_NUMBER_CHKFAST(tv_x, du.d); /* no refcount changes */ +#else + DUK_TVAL_SET_NUMBER(tv_x, du.d); /* no refcount changes */ +#endif +} + +DUK_LOCAL void duk__vm_bitwise_not(duk_hthread *thr, duk_tval *tv_x, duk_uint_fast_t idx_z) { + /* + * E5 Section 11.4.8 + */ + + duk_context *ctx = (duk_context *) thr; + duk_tval *tv_z; + duk_int32_t i1, i2; +#if !defined(DUK_USE_FASTINT) + duk_double_t d2; +#endif + + DUK_ASSERT(thr != NULL); + DUK_ASSERT(ctx != NULL); + DUK_ASSERT(tv_x != NULL); /* may be reg or const */ + DUK_ASSERT_DISABLE(idx_z >= 0); + DUK_ASSERT((duk_uint_t) idx_z < (duk_uint_t) duk_get_top(ctx)); + +#if defined(DUK_USE_FASTINT) + if (DUK_TVAL_IS_FASTINT(tv_x)) { + i1 = (duk_int32_t) DUK_TVAL_GET_FASTINT_I32(tv_x); + } + else +#endif /* DUK_USE_FASTINT */ + { + duk_push_tval(ctx, tv_x); + i1 = duk_to_int32(ctx, -1); + duk_pop(ctx); + } + + i2 = ~i1; + +#if defined(DUK_USE_FASTINT) + /* Result is always fastint compatible. */ + tv_z = thr->valstack_bottom + idx_z; + DUK_TVAL_SET_FASTINT_I32_UPDREF(thr, tv_z, i2); /* side effects */ +#else + d2 = (duk_double_t) i2; + + DUK_ASSERT(!DUK_ISNAN(d2)); /* 'val' is never NaN, so no need to normalize */ + DUK_ASSERT_DOUBLE_IS_NORMALIZED(d2); /* always normalized */ + + tv_z = thr->valstack_bottom + idx_z; + DUK_TVAL_SET_NUMBER_UPDREF(thr, tv_z, d2); /* side effects */ +#endif +} + +DUK_LOCAL void duk__vm_logical_not(duk_hthread *thr, duk_tval *tv_x, duk_tval *tv_z) { + /* + * E5 Section 11.4.9 + */ + + duk_bool_t res; + + DUK_ASSERT(thr != NULL); + DUK_ASSERT(tv_x != NULL); /* may be reg or const */ + DUK_ASSERT(tv_z != NULL); /* reg */ + + DUK_UNREF(thr); /* w/o refcounts */ + + /* ToBoolean() does not require any operations with side effects so + * we can do it efficiently. For footprint it would be better to use + * duk_js_toboolean() and then push+replace to the result slot. + */ + res = duk_js_toboolean(tv_x); /* does not modify tv_x */ + DUK_ASSERT(res == 0 || res == 1); + res ^= 1; + DUK_TVAL_SET_BOOLEAN_UPDREF(thr, tv_z, res); /* side effects */ +} + +/* + * Longjmp and other control flow transfer for the bytecode executor. + * + * The longjmp handler can handle all longjmp types: error, yield, and + * resume (pseudotypes are never actually thrown). + * + * Error policy for longjmp: should not ordinarily throw errors; if errors + * occur (e.g. due to out-of-memory) they bubble outwards rather than being + * handled recursively. + */ + +#define DUK__LONGJMP_RESTART 0 /* state updated, restart bytecode execution */ +#define DUK__LONGJMP_RETHROW 1 /* exit bytecode executor by rethrowing an error to caller */ + +#define DUK__RETHAND_RESTART 0 /* state updated, restart bytecode execution */ +#define DUK__RETHAND_FINISHED 1 /* exit bytecode execution with return value */ + +/* XXX: optimize reconfig valstack operations so that resize, clamp, and setting + * top are combined into one pass. + */ + +/* Reconfigure value stack for return to an Ecmascript function at 'act_idx'. */ +DUK_LOCAL void duk__reconfig_valstack_ecma_return(duk_hthread *thr, duk_size_t act_idx) { + duk_activation *act; + duk_hcompiledfunction *h_func; + duk_idx_t clamp_top; + + DUK_ASSERT(thr != NULL); + DUK_ASSERT_DISABLE(act_idx >= 0); /* unsigned */ + DUK_ASSERT(DUK_ACT_GET_FUNC(thr->callstack + act_idx) != NULL); + DUK_ASSERT(DUK_HOBJECT_IS_COMPILEDFUNCTION(DUK_ACT_GET_FUNC(thr->callstack + act_idx))); + DUK_ASSERT_DISABLE(thr->callstack[act_idx].idx_retval >= 0); /* unsigned */ + + /* Clamp so that values at 'clamp_top' and above are wiped and won't + * retain reachable garbage. Then extend to 'nregs' because we're + * returning to an Ecmascript function. + */ + + act = thr->callstack + act_idx; + h_func = (duk_hcompiledfunction *) DUK_ACT_GET_FUNC(act); + + thr->valstack_bottom = thr->valstack + act->idx_bottom; + DUK_ASSERT(act->idx_retval >= act->idx_bottom); + clamp_top = (duk_idx_t) (act->idx_retval - act->idx_bottom + 1); /* +1 = one retval */ + duk_set_top((duk_context *) thr, clamp_top); + act = NULL; + + (void) duk_valstack_resize_raw((duk_context *) thr, + (thr->valstack_bottom - thr->valstack) + /* bottom of current func */ + h_func->nregs + /* reg count */ + DUK_VALSTACK_INTERNAL_EXTRA, /* + spare */ + DUK_VSRESIZE_FLAG_SHRINK | /* flags */ + 0 /* no compact */ | + DUK_VSRESIZE_FLAG_THROW); + + duk_set_top((duk_context *) thr, h_func->nregs); +} + +DUK_LOCAL void duk__reconfig_valstack_ecma_catcher(duk_hthread *thr, duk_size_t act_idx, duk_size_t cat_idx) { + duk_activation *act; + duk_catcher *cat; + duk_hcompiledfunction *h_func; + duk_idx_t clamp_top; + + DUK_ASSERT(thr != NULL); + DUK_ASSERT_DISABLE(act_idx >= 0); /* unsigned */ + DUK_ASSERT(DUK_ACT_GET_FUNC(thr->callstack + act_idx) != NULL); + DUK_ASSERT(DUK_HOBJECT_IS_COMPILEDFUNCTION(DUK_ACT_GET_FUNC(thr->callstack + act_idx))); + DUK_ASSERT_DISABLE(thr->callstack[act_idx].idx_retval >= 0); /* unsigned */ + + act = thr->callstack + act_idx; + cat = thr->catchstack + cat_idx; + h_func = (duk_hcompiledfunction *) DUK_ACT_GET_FUNC(act); + + thr->valstack_bottom = thr->valstack + act->idx_bottom; + DUK_ASSERT(cat->idx_base >= act->idx_bottom); + clamp_top = (duk_idx_t) (cat->idx_base - act->idx_bottom + 2); /* +2 = catcher value, catcher lj_type */ + duk_set_top((duk_context *) thr, clamp_top); + act = NULL; + cat = NULL; + + (void) duk_valstack_resize_raw((duk_context *) thr, + (thr->valstack_bottom - thr->valstack) + /* bottom of current func */ + h_func->nregs + /* reg count */ + DUK_VALSTACK_INTERNAL_EXTRA, /* + spare */ + DUK_VSRESIZE_FLAG_SHRINK | /* flags */ + 0 /* no compact */ | + DUK_VSRESIZE_FLAG_THROW); + + duk_set_top((duk_context *) thr, h_func->nregs); +} + +/* Set catcher regs: idx_base+0 = value, idx_base+1 = lj_type. */ +DUK_LOCAL void duk__set_catcher_regs(duk_hthread *thr, duk_size_t cat_idx, duk_tval *tv_val_unstable, duk_small_uint_t lj_type) { + duk_tval *tv1; + + DUK_ASSERT(thr != NULL); + DUK_ASSERT(tv_val_unstable != NULL); + + tv1 = thr->valstack + thr->catchstack[cat_idx].idx_base; + DUK_ASSERT(tv1 < thr->valstack_top); + DUK_TVAL_SET_TVAL_UPDREF(thr, tv1, tv_val_unstable); /* side effects */ + + tv1 = thr->valstack + thr->catchstack[cat_idx].idx_base + 1; + DUK_ASSERT(tv1 < thr->valstack_top); + + DUK_TVAL_SET_FASTINT_U32_UPDREF(thr, tv1, (duk_uint32_t) lj_type); /* side effects */ +} + +DUK_LOCAL void duk__handle_catch(duk_hthread *thr, duk_size_t cat_idx, duk_tval *tv_val_unstable, duk_small_uint_t lj_type) { + duk_context *ctx; + duk_activation *act; + + DUK_ASSERT(thr != NULL); + DUK_ASSERT(tv_val_unstable != NULL); + ctx = (duk_context *) thr; + + duk__set_catcher_regs(thr, cat_idx, tv_val_unstable, lj_type); + + duk_hthread_catchstack_unwind(thr, cat_idx + 1); + duk_hthread_callstack_unwind(thr, thr->catchstack[cat_idx].callstack_index + 1); + + DUK_ASSERT(thr->callstack_top >= 1); + DUK_ASSERT(DUK_ACT_GET_FUNC(thr->callstack + thr->callstack_top - 1) != NULL); + DUK_ASSERT(DUK_HOBJECT_IS_COMPILEDFUNCTION(DUK_ACT_GET_FUNC(thr->callstack + thr->callstack_top - 1))); + + duk__reconfig_valstack_ecma_catcher(thr, thr->callstack_top - 1, cat_idx); + + DUK_ASSERT(thr->callstack_top >= 1); + act = thr->callstack + thr->callstack_top - 1; + act->curr_pc = thr->catchstack[cat_idx].pc_base + 0; /* +0 = catch */ + act = NULL; + + /* + * If entering a 'catch' block which requires an automatic + * catch variable binding, create the lexical environment. + * + * The binding is mutable (= writable) but not deletable. + * Step 4 for the catch production in E5 Section 12.14; + * no value is given for CreateMutableBinding 'D' argument, + * which implies the binding is not deletable. + */ + + if (DUK_CAT_HAS_CATCH_BINDING_ENABLED(&thr->catchstack[cat_idx])) { + duk_hobject *new_env; + duk_hobject *act_lex_env; + + DUK_DDD(DUK_DDDPRINT("catcher has an automatic catch binding")); + + /* Note: 'act' is dangerous here because it may get invalidate at many + * points, so we re-lookup it multiple times. + */ + DUK_ASSERT(thr->callstack_top >= 1); + act = thr->callstack + thr->callstack_top - 1; + + if (act->lex_env == NULL) { + DUK_ASSERT(act->var_env == NULL); + DUK_DDD(DUK_DDDPRINT("delayed environment initialization")); + + /* this may have side effects, so re-lookup act */ + duk_js_init_activation_environment_records_delayed(thr, act); + act = thr->callstack + thr->callstack_top - 1; + } + DUK_ASSERT(act->lex_env != NULL); + DUK_ASSERT(act->var_env != NULL); + DUK_ASSERT(DUK_ACT_GET_FUNC(act) != NULL); + DUK_UNREF(act); /* unreferenced without assertions */ + + act = thr->callstack + thr->callstack_top - 1; + act_lex_env = act->lex_env; + act = NULL; /* invalidated */ + + (void) duk_push_object_helper_proto(ctx, + DUK_HOBJECT_FLAG_EXTENSIBLE | + DUK_HOBJECT_CLASS_AS_FLAGS(DUK_HOBJECT_CLASS_DECENV), + act_lex_env); + new_env = DUK_GET_HOBJECT_NEGIDX(ctx, -1); + DUK_ASSERT(new_env != NULL); + DUK_DDD(DUK_DDDPRINT("new_env allocated: %!iO", (duk_heaphdr *) new_env)); + + /* Note: currently the catch binding is handled without a register + * binding because we don't support dynamic register bindings (they + * must be fixed for an entire function). So, there is no need to + * record regbases etc. + */ + + DUK_ASSERT(thr->catchstack[cat_idx].h_varname != NULL); + duk_push_hstring(ctx, thr->catchstack[cat_idx].h_varname); + duk_push_tval(ctx, thr->valstack + thr->catchstack[cat_idx].idx_base); + duk_xdef_prop(ctx, -3, DUK_PROPDESC_FLAGS_W); /* writable, not configurable */ + + act = thr->callstack + thr->callstack_top - 1; + act->lex_env = new_env; + DUK_HOBJECT_INCREF(thr, new_env); /* reachable through activation */ + + DUK_CAT_SET_LEXENV_ACTIVE(&thr->catchstack[cat_idx]); + + duk_pop(ctx); + + DUK_DDD(DUK_DDDPRINT("new_env finished: %!iO", (duk_heaphdr *) new_env)); + } + + DUK_CAT_CLEAR_CATCH_ENABLED(&thr->catchstack[cat_idx]); +} + +DUK_LOCAL void duk__handle_finally(duk_hthread *thr, duk_size_t cat_idx, duk_tval *tv_val_unstable, duk_small_uint_t lj_type) { + duk_activation *act; + + DUK_ASSERT(thr != NULL); + DUK_ASSERT(tv_val_unstable != NULL); + + duk__set_catcher_regs(thr, cat_idx, tv_val_unstable, lj_type); + + duk_hthread_catchstack_unwind(thr, cat_idx + 1); /* cat_idx catcher is kept, even for finally */ + duk_hthread_callstack_unwind(thr, thr->catchstack[cat_idx].callstack_index + 1); + + DUK_ASSERT(thr->callstack_top >= 1); + DUK_ASSERT(DUK_ACT_GET_FUNC(thr->callstack + thr->callstack_top - 1) != NULL); + DUK_ASSERT(DUK_HOBJECT_IS_COMPILEDFUNCTION(DUK_ACT_GET_FUNC(thr->callstack + thr->callstack_top - 1))); + + duk__reconfig_valstack_ecma_catcher(thr, thr->callstack_top - 1, cat_idx); + + DUK_ASSERT(thr->callstack_top >= 1); + act = thr->callstack + thr->callstack_top - 1; + act->curr_pc = thr->catchstack[cat_idx].pc_base + 1; /* +1 = finally */ + act = NULL; + + DUK_CAT_CLEAR_FINALLY_ENABLED(&thr->catchstack[cat_idx]); +} + +DUK_LOCAL void duk__handle_label(duk_hthread *thr, duk_size_t cat_idx, duk_small_uint_t lj_type) { + duk_activation *act; + + DUK_ASSERT(thr != NULL); + + DUK_ASSERT(thr->callstack_top >= 1); + act = thr->callstack + thr->callstack_top - 1; + + DUK_ASSERT(DUK_ACT_GET_FUNC(act) != NULL); + DUK_ASSERT(DUK_HOBJECT_HAS_COMPILEDFUNCTION(DUK_ACT_GET_FUNC(act))); + + /* +0 = break, +1 = continue */ + act->curr_pc = thr->catchstack[cat_idx].pc_base + (lj_type == DUK_LJ_TYPE_CONTINUE ? 1 : 0); + act = NULL; /* invalidated */ + + duk_hthread_catchstack_unwind(thr, cat_idx + 1); /* keep label catcher */ + /* no need to unwind callstack */ + + /* valstack should not need changes */ +#if defined(DUK_USE_ASSERTIONS) + DUK_ASSERT(thr->callstack_top >= 1); + act = thr->callstack + thr->callstack_top - 1; + DUK_ASSERT((duk_size_t) (thr->valstack_top - thr->valstack_bottom) == + (duk_size_t) ((duk_hcompiledfunction *) DUK_ACT_GET_FUNC(act))->nregs); +#endif +} + +/* Called for handling both a longjmp() with type DUK_LJ_TYPE_YIELD and + * when a RETURN opcode terminates a thread and yields to the resumer. + */ +DUK_LOCAL void duk__handle_yield(duk_hthread *thr, duk_hthread *resumer, duk_size_t act_idx, duk_tval *tv_val_unstable) { + duk_tval *tv1; + + DUK_ASSERT(thr != NULL); + DUK_ASSERT(resumer != NULL); + DUK_ASSERT(tv_val_unstable != NULL); + DUK_ASSERT(DUK_ACT_GET_FUNC(resumer->callstack + act_idx) != NULL); + DUK_ASSERT(DUK_HOBJECT_IS_COMPILEDFUNCTION(DUK_ACT_GET_FUNC(resumer->callstack + act_idx))); /* resume caller must be an ecmascript func */ + + tv1 = resumer->valstack + resumer->callstack[act_idx].idx_retval; /* return value from Duktape.Thread.resume() */ + DUK_TVAL_SET_TVAL_UPDREF(thr, tv1, tv_val_unstable); /* side effects */ + + duk_hthread_callstack_unwind(resumer, act_idx + 1); /* unwind to 'resume' caller */ + + /* no need to unwind catchstack */ + duk__reconfig_valstack_ecma_return(resumer, act_idx); + + /* caller must change active thread, and set thr->resumer to NULL */ +} + +DUK_LOCAL +duk_small_uint_t duk__handle_longjmp(duk_hthread *thr, + duk_hthread *entry_thread, + duk_size_t entry_callstack_top) { + duk_size_t entry_callstack_index; + duk_small_uint_t retval = DUK__LONGJMP_RESTART; + + DUK_ASSERT(thr != NULL); + DUK_ASSERT(entry_thread != NULL); + DUK_ASSERT(entry_callstack_top > 0); /* guarantees entry_callstack_top - 1 >= 0 */ + + entry_callstack_index = entry_callstack_top - 1; + + /* 'thr' is the current thread, as no-one resumes except us and we + * switch 'thr' in that case. + */ + DUK_ASSERT(thr == thr->heap->curr_thread); + + /* + * (Re)try handling the longjmp. + * + * A longjmp handler may convert the longjmp to a different type and + * "virtually" rethrow by goto'ing to 'check_longjmp'. Before the goto, + * the following must be updated: + * - the heap 'lj' state + * - 'thr' must reflect the "throwing" thread + */ + + check_longjmp: + + DUK_DD(DUK_DDPRINT("handling longjmp: type=%ld, value1=%!T, value2=%!T, iserror=%ld", + (long) thr->heap->lj.type, + (duk_tval *) &thr->heap->lj.value1, + (duk_tval *) &thr->heap->lj.value2, + (long) thr->heap->lj.iserror)); + + switch (thr->heap->lj.type) { + + case DUK_LJ_TYPE_RESUME: { + /* + * Note: lj.value1 is 'value', lj.value2 is 'resumee'. + * This differs from YIELD. + */ + + duk_tval *tv; + duk_tval *tv2; + duk_size_t act_idx; + duk_hthread *resumee; + + /* duk_bi_duk_object_yield() and duk_bi_duk_object_resume() ensure all of these are met */ + + DUK_ASSERT(thr->state == DUK_HTHREAD_STATE_RUNNING); /* unchanged by Duktape.Thread.resume() */ + DUK_ASSERT(thr->callstack_top >= 2); /* Ecmascript activation + Duktape.Thread.resume() activation */ + DUK_ASSERT(DUK_ACT_GET_FUNC(thr->callstack + thr->callstack_top - 1) != NULL && + DUK_HOBJECT_IS_NATIVEFUNCTION(DUK_ACT_GET_FUNC(thr->callstack + thr->callstack_top - 1)) && + ((duk_hnativefunction *) DUK_ACT_GET_FUNC(thr->callstack + thr->callstack_top - 1))->func == duk_bi_thread_resume); + DUK_ASSERT(DUK_ACT_GET_FUNC(thr->callstack + thr->callstack_top - 2) != NULL && + DUK_HOBJECT_IS_COMPILEDFUNCTION(DUK_ACT_GET_FUNC(thr->callstack + thr->callstack_top - 2))); /* an Ecmascript function */ + DUK_ASSERT_DISABLE((thr->callstack + thr->callstack_top - 2)->idx_retval >= 0); /* unsigned */ + + tv = &thr->heap->lj.value2; /* resumee */ + DUK_ASSERT(DUK_TVAL_IS_OBJECT(tv)); + DUK_ASSERT(DUK_TVAL_GET_OBJECT(tv) != NULL); + DUK_ASSERT(DUK_HOBJECT_IS_THREAD(DUK_TVAL_GET_OBJECT(tv))); + resumee = (duk_hthread *) DUK_TVAL_GET_OBJECT(tv); + + DUK_ASSERT(resumee != NULL); + DUK_ASSERT(resumee->resumer == NULL); + DUK_ASSERT(resumee->state == DUK_HTHREAD_STATE_INACTIVE || + resumee->state == DUK_HTHREAD_STATE_YIELDED); /* checked by Duktape.Thread.resume() */ + DUK_ASSERT(resumee->state != DUK_HTHREAD_STATE_YIELDED || + resumee->callstack_top >= 2); /* YIELDED: Ecmascript activation + Duktape.Thread.yield() activation */ + DUK_ASSERT(resumee->state != DUK_HTHREAD_STATE_YIELDED || + (DUK_ACT_GET_FUNC(resumee->callstack + resumee->callstack_top - 1) != NULL && + DUK_HOBJECT_IS_NATIVEFUNCTION(DUK_ACT_GET_FUNC(resumee->callstack + resumee->callstack_top - 1)) && + ((duk_hnativefunction *) DUK_ACT_GET_FUNC(resumee->callstack + resumee->callstack_top - 1))->func == duk_bi_thread_yield)); + DUK_ASSERT(resumee->state != DUK_HTHREAD_STATE_YIELDED || + (DUK_ACT_GET_FUNC(resumee->callstack + resumee->callstack_top - 2) != NULL && + DUK_HOBJECT_IS_COMPILEDFUNCTION(DUK_ACT_GET_FUNC(resumee->callstack + resumee->callstack_top - 2)))); /* an Ecmascript function */ + DUK_ASSERT_DISABLE(resumee->state != DUK_HTHREAD_STATE_YIELDED || + (resumee->callstack + resumee->callstack_top - 2)->idx_retval >= 0); /* idx_retval unsigned */ + DUK_ASSERT(resumee->state != DUK_HTHREAD_STATE_INACTIVE || + resumee->callstack_top == 0); /* INACTIVE: no activation, single function value on valstack */ + DUK_ASSERT(resumee->state != DUK_HTHREAD_STATE_INACTIVE || + (resumee->valstack_top == resumee->valstack + 1 && + DUK_TVAL_IS_OBJECT(resumee->valstack_top - 1) && + DUK_HOBJECT_IS_COMPILEDFUNCTION(DUK_TVAL_GET_OBJECT(resumee->valstack_top - 1)))); + + if (thr->heap->lj.iserror) { + /* + * Throw the error in the resumed thread's context; the + * error value is pushed onto the resumee valstack. + * + * Note: the callstack of the target may empty in this case + * too (i.e. the target thread has never been resumed). The + * value stack will contain the initial function in that case, + * which we simply ignore. + */ + + resumee->resumer = thr; + resumee->state = DUK_HTHREAD_STATE_RUNNING; + thr->state = DUK_HTHREAD_STATE_RESUMED; + DUK_HEAP_SWITCH_THREAD(thr->heap, resumee); + thr = resumee; + + thr->heap->lj.type = DUK_LJ_TYPE_THROW; + + /* thr->heap->lj.value1 is already the value to throw */ + /* thr->heap->lj.value2 is 'thread', will be wiped out at the end */ + + DUK_ASSERT(thr->heap->lj.iserror); /* already set */ + + DUK_DD(DUK_DDPRINT("-> resume with an error, converted to a throw in the resumee, propagate")); + goto check_longjmp; + } else if (resumee->state == DUK_HTHREAD_STATE_YIELDED) { + act_idx = resumee->callstack_top - 2; /* Ecmascript function */ + DUK_ASSERT_DISABLE(resumee->callstack[act_idx].idx_retval >= 0); /* unsigned */ + + tv = resumee->valstack + resumee->callstack[act_idx].idx_retval; /* return value from Duktape.Thread.yield() */ + DUK_ASSERT(tv >= resumee->valstack && tv < resumee->valstack_top); + tv2 = &thr->heap->lj.value1; + DUK_TVAL_SET_TVAL_UPDREF(thr, tv, tv2); /* side effects */ + + duk_hthread_callstack_unwind(resumee, act_idx + 1); /* unwind to 'yield' caller */ + + /* no need to unwind catchstack */ + + duk__reconfig_valstack_ecma_return(resumee, act_idx); + + resumee->resumer = thr; + resumee->state = DUK_HTHREAD_STATE_RUNNING; + thr->state = DUK_HTHREAD_STATE_RESUMED; + DUK_HEAP_SWITCH_THREAD(thr->heap, resumee); +#if 0 + thr = resumee; /* not needed, as we exit right away */ +#endif + DUK_DD(DUK_DDPRINT("-> resume with a value, restart execution in resumee")); + retval = DUK__LONGJMP_RESTART; + goto wipe_and_return; + } else { + duk_small_uint_t call_flags; + duk_bool_t setup_rc; + + /* resumee: [... initial_func] (currently actually: [initial_func]) */ + + duk_push_undefined((duk_context *) resumee); + tv = &thr->heap->lj.value1; + duk_push_tval((duk_context *) resumee, tv); + + /* resumee: [... initial_func undefined(= this) resume_value ] */ + + call_flags = DUK_CALL_FLAG_IS_RESUME; /* is resume, not a tail call */ + + setup_rc = duk_handle_ecma_call_setup(resumee, + 1, /* num_stack_args */ + call_flags); /* call_flags */ + if (setup_rc == 0) { + /* Shouldn't happen but check anyway. */ + DUK_ERROR_INTERNAL_DEFMSG(thr); + } + + resumee->resumer = thr; + resumee->state = DUK_HTHREAD_STATE_RUNNING; + thr->state = DUK_HTHREAD_STATE_RESUMED; + DUK_HEAP_SWITCH_THREAD(thr->heap, resumee); +#if 0 + thr = resumee; /* not needed, as we exit right away */ +#endif + DUK_DD(DUK_DDPRINT("-> resume with a value, restart execution in resumee")); + retval = DUK__LONGJMP_RESTART; + goto wipe_and_return; + } + DUK_UNREACHABLE(); + break; /* never here */ + } + + case DUK_LJ_TYPE_YIELD: { + /* + * Currently only allowed only if yielding thread has only + * Ecmascript activations (except for the Duktape.Thread.yield() + * call at the callstack top) and none of them constructor + * calls. + * + * This excludes the 'entry' thread which will always have + * a preventcount > 0. + */ + + duk_hthread *resumer; + + /* duk_bi_duk_object_yield() and duk_bi_duk_object_resume() ensure all of these are met */ + + DUK_ASSERT(thr != entry_thread); /* Duktape.Thread.yield() should prevent */ + DUK_ASSERT(thr->state == DUK_HTHREAD_STATE_RUNNING); /* unchanged from Duktape.Thread.yield() */ + DUK_ASSERT(thr->callstack_top >= 2); /* Ecmascript activation + Duktape.Thread.yield() activation */ + DUK_ASSERT(DUK_ACT_GET_FUNC(thr->callstack + thr->callstack_top - 1) != NULL && + DUK_HOBJECT_IS_NATIVEFUNCTION(DUK_ACT_GET_FUNC(thr->callstack + thr->callstack_top - 1)) && + ((duk_hnativefunction *) DUK_ACT_GET_FUNC(thr->callstack + thr->callstack_top - 1))->func == duk_bi_thread_yield); + DUK_ASSERT(DUK_ACT_GET_FUNC(thr->callstack + thr->callstack_top - 2) != NULL && + DUK_HOBJECT_IS_COMPILEDFUNCTION(DUK_ACT_GET_FUNC(thr->callstack + thr->callstack_top - 2))); /* an Ecmascript function */ + DUK_ASSERT_DISABLE((thr->callstack + thr->callstack_top - 2)->idx_retval >= 0); /* unsigned */ + + resumer = thr->resumer; + + DUK_ASSERT(resumer != NULL); + DUK_ASSERT(resumer->state == DUK_HTHREAD_STATE_RESUMED); /* written by a previous RESUME handling */ + DUK_ASSERT(resumer->callstack_top >= 2); /* Ecmascript activation + Duktape.Thread.resume() activation */ + DUK_ASSERT(DUK_ACT_GET_FUNC(resumer->callstack + resumer->callstack_top - 1) != NULL && + DUK_HOBJECT_IS_NATIVEFUNCTION(DUK_ACT_GET_FUNC(resumer->callstack + resumer->callstack_top - 1)) && + ((duk_hnativefunction *) DUK_ACT_GET_FUNC(resumer->callstack + resumer->callstack_top - 1))->func == duk_bi_thread_resume); + DUK_ASSERT(DUK_ACT_GET_FUNC(resumer->callstack + resumer->callstack_top - 2) != NULL && + DUK_HOBJECT_IS_COMPILEDFUNCTION(DUK_ACT_GET_FUNC(resumer->callstack + resumer->callstack_top - 2))); /* an Ecmascript function */ + DUK_ASSERT_DISABLE((resumer->callstack + resumer->callstack_top - 2)->idx_retval >= 0); /* unsigned */ + + if (thr->heap->lj.iserror) { + thr->state = DUK_HTHREAD_STATE_YIELDED; + thr->resumer = NULL; + resumer->state = DUK_HTHREAD_STATE_RUNNING; + DUK_HEAP_SWITCH_THREAD(thr->heap, resumer); + thr = resumer; + + thr->heap->lj.type = DUK_LJ_TYPE_THROW; + /* lj.value1 is already set */ + DUK_ASSERT(thr->heap->lj.iserror); /* already set */ + + DUK_DD(DUK_DDPRINT("-> yield an error, converted to a throw in the resumer, propagate")); + goto check_longjmp; + } else { + duk__handle_yield(thr, resumer, resumer->callstack_top - 2, &thr->heap->lj.value1); + + thr->state = DUK_HTHREAD_STATE_YIELDED; + thr->resumer = NULL; + resumer->state = DUK_HTHREAD_STATE_RUNNING; + DUK_HEAP_SWITCH_THREAD(thr->heap, resumer); +#if 0 + thr = resumer; /* not needed, as we exit right away */ +#endif + + DUK_DD(DUK_DDPRINT("-> yield a value, restart execution in resumer")); + retval = DUK__LONGJMP_RESTART; + goto wipe_and_return; + } + DUK_UNREACHABLE(); + break; /* never here */ + } + + case DUK_LJ_TYPE_THROW: { + /* + * Three possible outcomes: + * * A try or finally catcher is found => resume there. + * (or) + * * The error propagates to the bytecode executor entry + * level (and we're in the entry thread) => rethrow + * with a new longjmp(), after restoring the previous + * catchpoint. + * * The error is not caught in the current thread, so + * the thread finishes with an error. This works like + * a yielded error, except that the thread is finished + * and can no longer be resumed. (There is always a + * resumer in this case.) + * + * Note: until we hit the entry level, there can only be + * Ecmascript activations. + */ + + duk_catcher *cat; + duk_hthread *resumer; + + cat = thr->catchstack + thr->catchstack_top - 1; + while (cat >= thr->catchstack) { + if (thr == entry_thread && + cat->callstack_index < entry_callstack_index) { + /* entry level reached */ + break; + } + + if (DUK_CAT_HAS_CATCH_ENABLED(cat)) { + DUK_ASSERT(DUK_CAT_GET_TYPE(cat) == DUK_CAT_TYPE_TCF); + + duk__handle_catch(thr, + cat - thr->catchstack, + &thr->heap->lj.value1, + DUK_LJ_TYPE_THROW); + + DUK_DD(DUK_DDPRINT("-> throw caught by a 'catch' clause, restart execution")); + retval = DUK__LONGJMP_RESTART; + goto wipe_and_return; + } + + if (DUK_CAT_HAS_FINALLY_ENABLED(cat)) { + DUK_ASSERT(DUK_CAT_GET_TYPE(cat) == DUK_CAT_TYPE_TCF); + DUK_ASSERT(!DUK_CAT_HAS_CATCH_ENABLED(cat)); + + duk__handle_finally(thr, + cat - thr->catchstack, + &thr->heap->lj.value1, + DUK_LJ_TYPE_THROW); + + DUK_DD(DUK_DDPRINT("-> throw caught by a 'finally' clause, restart execution")); + retval = DUK__LONGJMP_RESTART; + goto wipe_and_return; + } + + cat--; + } + + if (thr == entry_thread) { + /* not caught by anything before entry level; rethrow and let the + * final catcher unwind everything + */ +#if 0 + duk_hthread_catchstack_unwind(thr, (cat - thr->catchstack) + 1); /* leave 'cat' as top catcher (also works if catchstack exhausted) */ + duk_hthread_callstack_unwind(thr, entry_callstack_index + 1); + +#endif + DUK_D(DUK_DPRINT("-> throw propagated up to entry level, rethrow and exit bytecode executor")); + retval = DUK__LONGJMP_RETHROW; + goto just_return; + /* Note: MUST NOT wipe_and_return here, as heap->lj must remain intact */ + } + + DUK_DD(DUK_DDPRINT("-> throw not caught by current thread, yield error to resumer and recheck longjmp")); + + /* not caught by current thread, thread terminates (yield error to resumer); + * note that this may cause a cascade if the resumer terminates with an uncaught + * exception etc (this is OK, but needs careful testing) + */ + + DUK_ASSERT(thr->resumer != NULL); + DUK_ASSERT(thr->resumer->callstack_top >= 2); /* Ecmascript activation + Duktape.Thread.resume() activation */ + DUK_ASSERT(DUK_ACT_GET_FUNC(thr->resumer->callstack + thr->resumer->callstack_top - 1) != NULL && + DUK_HOBJECT_IS_NATIVEFUNCTION(DUK_ACT_GET_FUNC(thr->resumer->callstack + thr->resumer->callstack_top - 1)) && + ((duk_hnativefunction *) DUK_ACT_GET_FUNC(thr->resumer->callstack + thr->resumer->callstack_top - 1))->func == duk_bi_thread_resume); /* Duktape.Thread.resume() */ + DUK_ASSERT(DUK_ACT_GET_FUNC(thr->resumer->callstack + thr->resumer->callstack_top - 2) != NULL && + DUK_HOBJECT_IS_COMPILEDFUNCTION(DUK_ACT_GET_FUNC(thr->resumer->callstack + thr->resumer->callstack_top - 2))); /* an Ecmascript function */ + + resumer = thr->resumer; + + /* reset longjmp */ + + DUK_ASSERT(thr->heap->lj.type == DUK_LJ_TYPE_THROW); /* already set */ + /* lj.value1 already set */ + + duk_hthread_terminate(thr); /* updates thread state, minimizes its allocations */ + DUK_ASSERT(thr->state == DUK_HTHREAD_STATE_TERMINATED); + + thr->resumer = NULL; + resumer->state = DUK_HTHREAD_STATE_RUNNING; + DUK_HEAP_SWITCH_THREAD(thr->heap, resumer); + thr = resumer; + goto check_longjmp; + } + + case DUK_LJ_TYPE_BREAK: /* pseudotypes, not used in actual longjmps */ + case DUK_LJ_TYPE_CONTINUE: + case DUK_LJ_TYPE_RETURN: + case DUK_LJ_TYPE_NORMAL: + default: { + /* should never happen, but be robust */ + DUK_D(DUK_DPRINT("caught unknown longjmp type %ld, treat as internal error", (long) thr->heap->lj.type)); + goto convert_to_internal_error; + } + + } /* end switch */ + + DUK_UNREACHABLE(); + + wipe_and_return: + /* this is not strictly necessary, but helps debugging */ + thr->heap->lj.type = DUK_LJ_TYPE_UNKNOWN; + thr->heap->lj.iserror = 0; + + DUK_TVAL_SET_UNDEFINED_UPDREF(thr, &thr->heap->lj.value1); /* side effects */ + DUK_TVAL_SET_UNDEFINED_UPDREF(thr, &thr->heap->lj.value2); /* side effects */ + + just_return: + return retval; + + convert_to_internal_error: + /* This could also be thrown internally (set the error, goto check_longjmp), + * but it's better for internal errors to bubble outwards so that we won't + * infinite loop in this catchpoint. + */ + DUK_ERROR_INTERNAL_DEFMSG(thr); + DUK_UNREACHABLE(); + return retval; +} + +/* Handle a BREAK/CONTINUE opcode. Avoid using longjmp() for BREAK/CONTINUE + * handling because it has a measurable performance impact in ordinary + * environments and an extreme impact in Emscripten (GH-342). + */ +DUK_LOCAL void duk__handle_break_or_continue(duk_hthread *thr, + duk_uint_t label_id, + duk_small_uint_t lj_type) { + duk_catcher *cat; + duk_size_t orig_callstack_index; + + DUK_ASSERT(thr != NULL); + + /* + * Find a matching label catcher or 'finally' catcher in + * the same function. + * + * A label catcher must always exist and will match unless + * a 'finally' captures the break/continue first. It is the + * compiler's responsibility to ensure that labels are used + * correctly. + */ + + /* Note: thr->catchstack_top may be 0, so that cat < thr->catchstack + * initially. This is OK and intended. + */ + cat = thr->catchstack + thr->catchstack_top - 1; + DUK_ASSERT(thr->callstack_top > 0); + orig_callstack_index = thr->callstack_top - 1; + + DUK_DDD(DUK_DDDPRINT("handling break/continue with label=%ld, callstack index=%ld", + (long) label_id, (long) cat->callstack_index)); + + while (cat >= thr->catchstack) { + if (cat->callstack_index != orig_callstack_index) { + break; + } + DUK_DDD(DUK_DDDPRINT("considering catcher %ld: type=%ld label=%ld", + (long) (cat - thr->catchstack), + (long) DUK_CAT_GET_TYPE(cat), + (long) DUK_CAT_GET_LABEL(cat))); + + if (DUK_CAT_GET_TYPE(cat) == DUK_CAT_TYPE_TCF && + DUK_CAT_HAS_FINALLY_ENABLED(cat)) { + duk_size_t cat_idx; + duk_tval tv_tmp; + + cat_idx = (duk_size_t) (cat - thr->catchstack); /* get before side effects */ + + DUK_TVAL_SET_FASTINT_U32(&tv_tmp, (duk_uint32_t) label_id); + duk__handle_finally(thr, cat_idx, &tv_tmp, lj_type); + + DUK_DD(DUK_DDPRINT("-> break/continue caught by 'finally', restart execution")); + return; + } + if (DUK_CAT_GET_TYPE(cat) == DUK_CAT_TYPE_LABEL && + (duk_uint_t) DUK_CAT_GET_LABEL(cat) == label_id) { + duk_size_t cat_idx; + + cat_idx = (duk_size_t) (cat - thr->catchstack); + duk__handle_label(thr, cat_idx, lj_type); + + DUK_DD(DUK_DDPRINT("-> break/continue caught by a label catcher (in the same function), restart execution")); + return; + } + cat--; + } + + /* should never happen, but be robust */ + DUK_D(DUK_DPRINT("-> break/continue not caught by anything in the current function (should never happen), throw internal error")); + DUK_ERROR_INTERNAL_DEFMSG(thr); + return; +} + +/* Handle a RETURN opcode. Avoid using longjmp() for return handling because + * it has a measurable performance impact in ordinary environments and an extreme + * impact in Emscripten (GH-342). Return value is on value stack top. + */ +DUK_LOCAL duk_small_uint_t duk__handle_return(duk_hthread *thr, + duk_hthread *entry_thread, + duk_size_t entry_callstack_top) { + duk_tval *tv1; + duk_tval *tv2; + duk_hthread *resumer; + duk_catcher *cat; + duk_size_t new_cat_top; + duk_size_t orig_callstack_index; + + /* We can directly access value stack here. */ + + DUK_ASSERT(thr != NULL); + DUK_ASSERT(entry_thread != NULL); + DUK_ASSERT(thr->valstack_top - 1 >= thr->valstack_bottom); + tv1 = thr->valstack_top - 1; + DUK_TVAL_CHKFAST_INPLACE(tv1); /* fastint downgrade check for return values */ + + /* + * Four possible outcomes: + * + * 1. A 'finally' in the same function catches the 'return'. + * It may continue to propagate when 'finally' is finished, + * or it may be neutralized by 'finally' (both handled by + * ENDFIN). + * + * 2. The return happens at the entry level of the bytecode + * executor, so return from the executor (in C stack). + * + * 3. There is a calling (Ecmascript) activation in the call + * stack => return to it, in the same executor instance. + * + * 4. There is no calling activation, and the thread is + * terminated. There is always a resumer in this case, + * which gets the return value similarly to a 'yield' + * (except that the current thread can no longer be + * resumed). + */ + + DUK_ASSERT(thr != NULL); + DUK_ASSERT(thr->callstack_top >= 1); + DUK_ASSERT(thr->catchstack != NULL); + + /* XXX: does not work if thr->catchstack is NULL */ + /* XXX: does not work if thr->catchstack is allocated but lowest pointer */ + + cat = thr->catchstack + thr->catchstack_top - 1; /* may be < thr->catchstack initially */ + DUK_ASSERT(thr->callstack_top > 0); /* ensures callstack_top - 1 >= 0 */ + orig_callstack_index = thr->callstack_top - 1; + + while (cat >= thr->catchstack) { + if (cat->callstack_index != orig_callstack_index) { + break; + } + if (DUK_CAT_GET_TYPE(cat) == DUK_CAT_TYPE_TCF && + DUK_CAT_HAS_FINALLY_ENABLED(cat)) { + duk_size_t cat_idx; + + cat_idx = (duk_size_t) (cat - thr->catchstack); /* get before side effects */ + + DUK_ASSERT(thr->valstack_top - 1 >= thr->valstack_bottom); + duk__handle_finally(thr, cat_idx, thr->valstack_top - 1, DUK_LJ_TYPE_RETURN); + + DUK_DD(DUK_DDPRINT("-> return caught by 'finally', restart execution")); + return DUK__RETHAND_RESTART; + } + cat--; + } + /* If out of catchstack, cat = thr->catchstack - 1; + * new_cat_top will be 0 in that case. + */ + new_cat_top = (duk_size_t) ((cat + 1) - thr->catchstack); + cat = NULL; /* avoid referencing, invalidated */ + + DUK_DDD(DUK_DDDPRINT("no catcher in catch stack, return to calling activation / yield")); + + if (thr == entry_thread && + thr->callstack_top == entry_callstack_top) { + /* Return to the bytecode executor caller which will unwind stacks. + * Return value is already on the stack top: [ ... retval ]. + */ + + /* XXX: could unwind catchstack here, so that call handling + * didn't need to do that? + */ + DUK_DDD(DUK_DDDPRINT("-> return propagated up to entry level, exit bytecode executor")); + return DUK__RETHAND_FINISHED; + } + + if (thr->callstack_top >= 2) { + /* There is a caller; it MUST be an Ecmascript caller (otherwise it would + * match entry level check) + */ + + DUK_DDD(DUK_DDDPRINT("return to Ecmascript caller, idx_retval=%ld, lj_value1=%!T", + (long) (thr->callstack + thr->callstack_top - 2)->idx_retval, + (duk_tval *) &thr->heap->lj.value1)); + + DUK_ASSERT(DUK_HOBJECT_IS_COMPILEDFUNCTION(DUK_ACT_GET_FUNC(thr->callstack + thr->callstack_top - 2))); /* must be ecmascript */ + + tv1 = thr->valstack + (thr->callstack + thr->callstack_top - 2)->idx_retval; + DUK_ASSERT(thr->valstack_top - 1 >= thr->valstack_bottom); + tv2 = thr->valstack_top - 1; + DUK_TVAL_SET_TVAL_UPDREF(thr, tv1, tv2); /* side effects */ + + DUK_DDD(DUK_DDDPRINT("return value at idx_retval=%ld is %!T", + (long) (thr->callstack + thr->callstack_top - 2)->idx_retval, + (duk_tval *) (thr->valstack + (thr->callstack + thr->callstack_top - 2)->idx_retval))); + + duk_hthread_catchstack_unwind(thr, new_cat_top); /* leave 'cat' as top catcher (also works if catchstack exhausted) */ + duk_hthread_callstack_unwind(thr, thr->callstack_top - 1); + duk__reconfig_valstack_ecma_return(thr, thr->callstack_top - 1); + + DUK_DD(DUK_DDPRINT("-> return not intercepted, restart execution in caller")); + return DUK__RETHAND_RESTART; + } + + DUK_DD(DUK_DDPRINT("no calling activation, thread finishes (similar to yield)")); + + DUK_ASSERT(thr->resumer != NULL); + DUK_ASSERT(thr->resumer->callstack_top >= 2); /* Ecmascript activation + Duktape.Thread.resume() activation */ + DUK_ASSERT(DUK_ACT_GET_FUNC(thr->resumer->callstack + thr->resumer->callstack_top - 1) != NULL && + DUK_HOBJECT_IS_NATIVEFUNCTION(DUK_ACT_GET_FUNC(thr->resumer->callstack + thr->resumer->callstack_top - 1)) && + ((duk_hnativefunction *) DUK_ACT_GET_FUNC(thr->resumer->callstack + thr->resumer->callstack_top - 1))->func == duk_bi_thread_resume); /* Duktape.Thread.resume() */ + DUK_ASSERT(DUK_ACT_GET_FUNC(thr->resumer->callstack + thr->resumer->callstack_top - 2) != NULL && + DUK_HOBJECT_IS_COMPILEDFUNCTION(DUK_ACT_GET_FUNC(thr->resumer->callstack + thr->resumer->callstack_top - 2))); /* an Ecmascript function */ + DUK_ASSERT_DISABLE((thr->resumer->callstack + thr->resumer->callstack_top - 2)->idx_retval >= 0); /* unsigned */ + DUK_ASSERT(thr->state == DUK_HTHREAD_STATE_RUNNING); + DUK_ASSERT(thr->resumer->state == DUK_HTHREAD_STATE_RESUMED); + + resumer = thr->resumer; + + /* Share yield longjmp handler. */ + DUK_ASSERT(thr->valstack_top - 1 >= thr->valstack_bottom); + duk__handle_yield(thr, resumer, resumer->callstack_top - 2, thr->valstack_top - 1); + + duk_hthread_terminate(thr); /* updates thread state, minimizes its allocations */ + DUK_ASSERT(thr->state == DUK_HTHREAD_STATE_TERMINATED); + + thr->resumer = NULL; + resumer->state = DUK_HTHREAD_STATE_RUNNING; + DUK_HEAP_SWITCH_THREAD(thr->heap, resumer); +#if 0 + thr = resumer; /* not needed */ +#endif + + DUK_DD(DUK_DDPRINT("-> return not caught, thread terminated; handle like yield, restart execution in resumer")); + return DUK__RETHAND_RESTART; +} + +/* + * Executor interrupt handling + * + * The handler is called whenever the interrupt countdown reaches zero + * (or below). The handler must perform whatever checks are activated, + * e.g. check for cumulative step count to impose an execution step + * limit or check for breakpoints or other debugger interaction. + * + * When the actions are done, the handler must reinit the interrupt + * init and counter values. The 'init' value must indicate how many + * bytecode instructions are executed before the next interrupt. The + * counter must interface with the bytecode executor loop. Concretely, + * the new init value is normally one higher than the new counter value. + * For instance, to execute exactly one bytecode instruction the init + * value is set to 1 and the counter to 0. If an error is thrown by the + * interrupt handler, the counters are set to the same value (e.g. both + * to 0 to cause an interrupt when the next bytecode instruction is about + * to be executed after error handling). + * + * Maintaining the init/counter value properly is important for accurate + * behavior. For instance, executor step limit needs a cumulative step + * count which is simply computed as a sum of 'init' values. This must + * work accurately even when single stepping. + */ + +#if defined(DUK_USE_INTERRUPT_COUNTER) + +#define DUK__INT_NOACTION 0 /* no specific action, resume normal execution */ +#define DUK__INT_RESTART 1 /* must "goto restart_execution", e.g. breakpoints changed */ + +#if defined(DUK_USE_DEBUGGER_SUPPORT) +DUK_LOCAL void duk__interrupt_handle_debugger(duk_hthread *thr, duk_bool_t *out_immediate, duk_small_uint_t *out_interrupt_retval) { + duk_context *ctx; + duk_activation *act; + duk_breakpoint *bp; + duk_breakpoint **bp_active; + duk_uint_fast32_t line = 0; + duk_bool_t process_messages; + duk_bool_t processed_messages = 0; + + DUK_ASSERT(thr->heap->dbg_processing == 0); /* don't re-enter e.g. during Eval */ + + ctx = (duk_context *) thr; + act = thr->callstack + thr->callstack_top - 1; + + /* It might seem that replacing 'thr->heap' with just 'heap' below + * might be a good idea, but it increases code size slightly + * (probably due to unnecessary spilling) at least on x64. + */ + + /* + * Breakpoint and step state checks + */ + + if (act->flags & DUK_ACT_FLAG_BREAKPOINT_ACTIVE || + (thr->heap->dbg_step_thread == thr && + thr->heap->dbg_step_csindex == thr->callstack_top - 1)) { + line = duk_debug_curr_line(thr); + + if (act->prev_line != line) { + /* Stepped? Step out is handled by callstack unwind. */ + if ((thr->heap->dbg_step_type == DUK_STEP_TYPE_INTO || + thr->heap->dbg_step_type == DUK_STEP_TYPE_OVER) && + (thr->heap->dbg_step_thread == thr) && + (thr->heap->dbg_step_csindex == thr->callstack_top - 1) && + (line != thr->heap->dbg_step_startline)) { + DUK_D(DUK_DPRINT("STEP STATE TRIGGERED PAUSE at line %ld", + (long) line)); + + DUK_HEAP_SET_PAUSED(thr->heap); + } + + /* Check for breakpoints only on line transition. + * Breakpoint is triggered when we enter the target + * line from a different line, and the previous line + * was within the same function. + * + * This condition is tricky: the condition used to be + * that transition to -or across- the breakpoint line + * triggered the breakpoint. This seems intuitively + * better because it handles breakpoints on lines with + * no emitted opcodes; but this leads to the issue + * described in: https://github.com/svaarala/duktape/issues/263. + */ + bp_active = thr->heap->dbg_breakpoints_active; + for (;;) { + bp = *bp_active++; + if (bp == NULL) { + break; + } + + DUK_ASSERT(bp->filename != NULL); + if (act->prev_line != bp->line && line == bp->line) { + DUK_D(DUK_DPRINT("BREAKPOINT TRIGGERED at %!O:%ld", + (duk_heaphdr *) bp->filename, (long) bp->line)); + + DUK_HEAP_SET_PAUSED(thr->heap); + } + } + } else { + ; + } + + act->prev_line = line; + } + + /* + * Rate limit check for sending status update or peeking into + * the debug transport. Both can be expensive operations that + * we don't want to do on every opcode. + * + * Making sure the interval remains reasonable on a wide variety + * of targets and bytecode is difficult without a timestamp, so + * we use a Date-provided timestamp for the rate limit check. + * But since it's also expensive to get a timestamp, a bytecode + * counter is used to rate limit getting timestamps. + */ + + process_messages = 0; + if (thr->heap->dbg_state_dirty || thr->heap->dbg_paused || thr->heap->dbg_detaching) { + /* Enter message processing loop for sending Status notifys and + * to finish a pending detach. + */ + process_messages = 1; + } + + /* XXX: remove heap->dbg_exec_counter, use heap->inst_count_interrupt instead? */ + thr->heap->dbg_exec_counter += thr->interrupt_init; + if (thr->heap->dbg_exec_counter - thr->heap->dbg_last_counter >= DUK_HEAP_DBG_RATELIMIT_OPCODES) { + /* Overflow of the execution counter is fine and doesn't break + * anything here. + */ + + duk_double_t now, diff_last; + + thr->heap->dbg_last_counter = thr->heap->dbg_exec_counter; + now = DUK_USE_DATE_GET_NOW(ctx); + + diff_last = now - thr->heap->dbg_last_time; + if (diff_last < 0.0 || diff_last >= (duk_double_t) DUK_HEAP_DBG_RATELIMIT_MILLISECS) { + /* Negative value checked so that a "time jump" works + * reasonably. + * + * Same interval is now used for status sending and + * peeking. + */ + + thr->heap->dbg_last_time = now; + thr->heap->dbg_state_dirty = 1; + process_messages = 1; + } + } + + /* + * Process messages and send status if necessary. + * + * If we're paused, we'll block for new messages. If we're not + * paused, we'll process anything we can peek but won't block + * for more. Detach (and re-attach) handling is all localized + * to duk_debug_process_messages() too. + * + * Debugger writes outside the message loop may cause debugger + * detach1 phase to run, after which dbg_read_cb == NULL and + * dbg_detaching != 0. The message loop will finish the detach + * by running detach2 phase, so enter the message loop also when + * detaching. + */ + + act = NULL; /* may be changed */ + if (process_messages) { + DUK_ASSERT(thr->heap->dbg_processing == 0); + processed_messages = duk_debug_process_messages(thr, 0 /*no_block*/); + DUK_ASSERT(thr->heap->dbg_processing == 0); + } + + /* Continue checked execution if there are breakpoints or we're stepping. + * Also use checked execution if paused flag is active - it shouldn't be + * because the debug message loop shouldn't terminate if it was. Step out + * is handled by callstack unwind and doesn't need checked execution. + * Note that debugger may have detached due to error or explicit request + * above, so we must recheck attach status. + */ + + if (DUK_HEAP_IS_DEBUGGER_ATTACHED(thr->heap)) { + act = thr->callstack + thr->callstack_top - 1; /* relookup, may have changed */ + if (act->flags & DUK_ACT_FLAG_BREAKPOINT_ACTIVE || + ((thr->heap->dbg_step_type == DUK_STEP_TYPE_INTO || + thr->heap->dbg_step_type == DUK_STEP_TYPE_OVER) && + thr->heap->dbg_step_thread == thr && + thr->heap->dbg_step_csindex == thr->callstack_top - 1) || + thr->heap->dbg_paused) { + *out_immediate = 1; + } + + /* If we processed any debug messages breakpoints may have + * changed; restart execution to re-check active breakpoints. + */ + if (processed_messages) { + DUK_D(DUK_DPRINT("processed debug messages, restart execution to recheck possibly changed breakpoints")); + *out_interrupt_retval = DUK__INT_RESTART; + } + } else { + DUK_D(DUK_DPRINT("debugger became detached, resume normal execution")); + } +} +#endif /* DUK_USE_DEBUGGER_SUPPORT */ + +DUK_LOCAL duk_small_uint_t duk__executor_interrupt(duk_hthread *thr) { + duk_int_t ctr; + duk_activation *act; + duk_hcompiledfunction *fun; + duk_bool_t immediate = 0; + duk_small_uint_t retval; + + DUK_ASSERT(thr != NULL); + DUK_ASSERT(thr->heap != NULL); + DUK_ASSERT(thr->callstack != NULL); + DUK_ASSERT(thr->callstack_top > 0); + +#if defined(DUK_USE_DEBUG) + thr->heap->inst_count_interrupt += thr->interrupt_init; + DUK_DD(DUK_DDPRINT("execution interrupt, counter=%ld, init=%ld, " + "instruction counts: executor=%ld, interrupt=%ld", + (long) thr->interrupt_counter, (long) thr->interrupt_init, + (long) thr->heap->inst_count_exec, (long) thr->heap->inst_count_interrupt)); +#endif + + retval = DUK__INT_NOACTION; + ctr = DUK_HTHREAD_INTCTR_DEFAULT; + + /* + * Avoid nested calls. Concretely this happens during debugging, e.g. + * when we eval() an expression. + * + * Also don't interrupt if we're currently doing debug processing + * (which can be initiated outside the bytecode executor) as this + * may cause the debugger to be called recursively. Check required + * for correct operation of throw intercept and other "exotic" halting + * scenarios. + */ + +#if defined(DUK_USE_DEBUGGER_SUPPORT) + if (DUK_HEAP_HAS_INTERRUPT_RUNNING(thr->heap) || thr->heap->dbg_processing) { +#else + if (DUK_HEAP_HAS_INTERRUPT_RUNNING(thr->heap)) { +#endif + DUK_DD(DUK_DDPRINT("nested executor interrupt, ignoring")); + + /* Set a high interrupt counter; the original executor + * interrupt invocation will rewrite before exiting. + */ + thr->interrupt_init = ctr; + thr->interrupt_counter = ctr - 1; + return DUK__INT_NOACTION; + } + DUK_HEAP_SET_INTERRUPT_RUNNING(thr->heap); + + act = thr->callstack + thr->callstack_top - 1; + + fun = (duk_hcompiledfunction *) DUK_ACT_GET_FUNC(act); + DUK_ASSERT(DUK_HOBJECT_HAS_COMPILEDFUNCTION((duk_hobject *) fun)); + + DUK_UNREF(fun); + +#if defined(DUK_USE_EXEC_TIMEOUT_CHECK) + /* + * Execution timeout check + */ + + if (DUK_USE_EXEC_TIMEOUT_CHECK(thr->heap->heap_udata)) { + /* Keep throwing an error whenever we get here. The unusual values + * are set this way because no instruction is ever executed, we just + * throw an error until all try/catch/finally and other catchpoints + * have been exhausted. Duktape/C code gets control at each protected + * call but whenever it enters back into Duktape the RangeError gets + * raised. User exec timeout check must consistently indicate a timeout + * until we've fully bubbled out of Duktape. + */ + DUK_D(DUK_DPRINT("execution timeout, throwing a RangeError")); + thr->interrupt_init = 0; + thr->interrupt_counter = 0; + DUK_HEAP_CLEAR_INTERRUPT_RUNNING(thr->heap); + DUK_ERROR_RANGE(thr, "execution timeout"); + } +#endif /* DUK_USE_EXEC_TIMEOUT_CHECK */ + +#if defined(DUK_USE_DEBUGGER_SUPPORT) + if (!thr->heap->dbg_processing && + (thr->heap->dbg_read_cb != NULL || thr->heap->dbg_detaching)) { + /* Avoid recursive re-entry; enter when we're attached or + * detaching (to finish off the pending detach). + */ + duk__interrupt_handle_debugger(thr, &immediate, &retval); + act = thr->callstack + thr->callstack_top - 1; /* relookup if changed */ + DUK_UNREF(act); /* 'act' is no longer accessed, scanbuild fix */ + } +#endif /* DUK_USE_DEBUGGER_SUPPORT */ + + /* + * Update the interrupt counter + */ + + if (immediate) { + /* Cause an interrupt after executing one instruction. */ + ctr = 1; + } + + /* The counter value is one less than the init value: init value should + * indicate how many instructions are executed before interrupt. To + * execute 1 instruction (after interrupt handler return), counter must + * be 0. + */ + DUK_ASSERT(ctr >= 1); + thr->interrupt_init = ctr; + thr->interrupt_counter = ctr - 1; + DUK_HEAP_CLEAR_INTERRUPT_RUNNING(thr->heap); + + return retval; +} +#endif /* DUK_USE_INTERRUPT_COUNTER */ + +/* + * Debugger handling for executor restart + * + * Check for breakpoints, stepping, etc, and figure out if we should execute + * in checked or normal mode. Note that we can't do this when an activation + * is created, because breakpoint status (and stepping status) may change + * later, so we must recheck every time we're executing an activation. + * This primitive should be side effect free to avoid changes during check. + */ + +#if defined(DUK_USE_DEBUGGER_SUPPORT) +DUK_LOCAL void duk__executor_recheck_debugger(duk_hthread *thr, duk_activation *act, duk_hcompiledfunction *fun) { + duk_heap *heap; + duk_tval *tv_tmp; + duk_hstring *filename; + duk_small_uint_t bp_idx; + duk_breakpoint **bp_active; + + DUK_ASSERT(thr != NULL); + DUK_ASSERT(act != NULL); + DUK_ASSERT(fun != NULL); + + heap = thr->heap; + bp_active = heap->dbg_breakpoints_active; + act->flags &= ~DUK_ACT_FLAG_BREAKPOINT_ACTIVE; + + tv_tmp = duk_hobject_find_existing_entry_tval_ptr(thr->heap, (duk_hobject *) fun, DUK_HTHREAD_STRING_FILE_NAME(thr)); + if (tv_tmp && DUK_TVAL_IS_STRING(tv_tmp)) { + filename = DUK_TVAL_GET_STRING(tv_tmp); + + /* Figure out all active breakpoints. A breakpoint is + * considered active if the current function's fileName + * matches the breakpoint's fileName, AND there is no + * inner function that has matching line numbers + * (otherwise a breakpoint would be triggered both + * inside and outside of the inner function which would + * be confusing). Example: + * + * function foo() { + * print('foo'); + * function bar() { <-. breakpoints in these + * print('bar'); | lines should not affect + * } <-' foo() execution + * bar(); + * } + * + * We need a few things that are only available when + * debugger support is enabled: (1) a line range for + * each function, and (2) access to the function + * template to access the inner functions (and their + * line ranges). + * + * It's important to have a narrow match for active + * breakpoints so that we don't enter checked execution + * when that's not necessary. For instance, if we're + * running inside a certain function and there's + * breakpoint outside in (after the call site), we + * don't want to slow down execution of the function. + */ + + for (bp_idx = 0; bp_idx < heap->dbg_breakpoint_count; bp_idx++) { + duk_breakpoint *bp = heap->dbg_breakpoints + bp_idx; + duk_hobject **funcs, **funcs_end; + duk_hcompiledfunction *inner_fun; + duk_bool_t bp_match; + + if (bp->filename == filename && + bp->line >= fun->start_line && bp->line <= fun->end_line) { + bp_match = 1; + DUK_DD(DUK_DDPRINT("breakpoint filename and line match: " + "%s:%ld vs. %s (line %ld vs. %ld-%ld)", + DUK_HSTRING_GET_DATA(bp->filename), + (long) bp->line, + DUK_HSTRING_GET_DATA(filename), + (long) bp->line, + (long) fun->start_line, + (long) fun->end_line)); + + funcs = DUK_HCOMPILEDFUNCTION_GET_FUNCS_BASE(thr->heap, fun); + funcs_end = DUK_HCOMPILEDFUNCTION_GET_FUNCS_END(thr->heap, fun); + while (funcs != funcs_end) { + inner_fun = (duk_hcompiledfunction *) *funcs; + DUK_ASSERT(DUK_HOBJECT_IS_COMPILEDFUNCTION((duk_hobject *) inner_fun)); + if (bp->line >= inner_fun->start_line && bp->line <= inner_fun->end_line) { + DUK_DD(DUK_DDPRINT("inner function masks ('captures') breakpoint")); + bp_match = 0; + break; + } + funcs++; + } + + if (bp_match) { + /* No need to check for size of bp_active list, + * it's always larger than maximum number of + * breakpoints. + */ + act->flags |= DUK_ACT_FLAG_BREAKPOINT_ACTIVE; + *bp_active = heap->dbg_breakpoints + bp_idx; + bp_active++; + } + } + } + } + + *bp_active = NULL; /* terminate */ + + DUK_DD(DUK_DDPRINT("ACTIVE BREAKPOINTS: %ld", (long) (bp_active - thr->heap->dbg_breakpoints_active))); + + /* Force pause if we were doing "step into" in another activation. */ + if (thr->heap->dbg_step_thread != NULL && + thr->heap->dbg_step_type == DUK_STEP_TYPE_INTO && + (thr->heap->dbg_step_thread != thr || + thr->heap->dbg_step_csindex != thr->callstack_top - 1)) { + DUK_D(DUK_DPRINT("STEP INTO ACTIVE, FORCE PAUSED")); + DUK_HEAP_SET_PAUSED(thr->heap); + } + + /* Force interrupt right away if we're paused or in "checked mode". + * Step out is handled by callstack unwind. + */ + if (act->flags & (DUK_ACT_FLAG_BREAKPOINT_ACTIVE) || + thr->heap->dbg_paused || + (thr->heap->dbg_step_type != DUK_STEP_TYPE_OUT && + thr->heap->dbg_step_csindex == thr->callstack_top - 1)) { + /* We'll need to interrupt early so recompute the init + * counter to reflect the number of bytecode instructions + * executed so that step counts for e.g. debugger rate + * limiting are accurate. + */ + DUK_ASSERT(thr->interrupt_counter <= thr->interrupt_init); + thr->interrupt_init = thr->interrupt_init - thr->interrupt_counter; + thr->interrupt_counter = 0; + } +} +#endif /* DUK_USE_DEBUGGER_SUPPORT */ + +/* + * Ecmascript bytecode executor. + * + * Resume execution for the current thread from its current activation. + * Returns when execution would return from the entry level activation, + * leaving a single return value on top of the stack. Function calls + * and thread resumptions are handled internally. If an error occurs, + * a longjmp() with type DUK_LJ_TYPE_THROW is called on the entry level + * setjmp() jmpbuf. + * + * Ecmascript function calls and coroutine resumptions are handled + * internally (by the outer executor function) without recursive C calls. + * Other function calls are handled using duk_handle_call(), increasing + * C recursion depth. + * + * Abrupt completions (= long control tranfers) are handled either + * directly by reconfiguring relevant stacks and restarting execution, + * or via a longjmp. Longjmp-free handling is preferable for performance + * (especially Emscripten performance), and is used for: break, continue, + * and return. + * + * For more detailed notes, see doc/execution.rst. + * + * Also see doc/code-issues.rst for discussion of setjmp(), longjmp(), + * and volatile. + */ + +/* Presence of 'fun' is config based, there's a marginal performance + * difference and the best option is architecture dependent. + */ +#if defined(DUK_USE_EXEC_FUN_LOCAL) +#define DUK__FUN() fun +#else +#define DUK__FUN() ((duk_hcompiledfunction *) DUK_ACT_GET_FUNC((thr)->callstack + (thr)->callstack_top - 1)) +#endif +#define DUK__STRICT() (DUK_HOBJECT_HAS_STRICT((duk_hobject *) DUK__FUN())) + +/* Reg/const access macros: these are very footprint and performance sensitive + * so modify with care. + */ +#define DUK__REG(x) (*(thr->valstack_bottom + (x))) +#define DUK__REGP(x) (thr->valstack_bottom + (x)) +#define DUK__CONST(x) (*(consts + (x))) +#define DUK__CONSTP(x) (consts + (x)) +#if 0 +#define DUK__REGCONST(x) ((x) < DUK_BC_REGLIMIT ? DUK__REG((x)) : DUK__CONST((x) - DUK_BC_REGLIMIT)) +#define DUK__REGCONSTP(x) ((x) < DUK_BC_REGLIMIT ? DUK__REGP((x)) : DUK__CONSTP((x) - DUK_BC_REGLIMIT)) +#define DUK__REGCONST(x) *((((x) < DUK_BC_REGLIMIT ? thr->valstack_bottom : consts2) + (x))) +#define DUK__REGCONSTP(x) (((x) < DUK_BC_REGLIMIT ? thr->valstack_bottom : consts2) + (x)) +#endif +/* This macro works when a regconst field is 9 bits, [0,0x1ff]. Adding + * DUK_LIKELY/DUK_UNLIKELY increases code footprint and doesn't seem to + * improve performance on x64 (and actually harms performance in some tests). + */ +#define DUK__RCISREG(x) (((x) & 0x100) == 0) +#define DUK__REGCONST(x) (*((DUK__RCISREG((x)) ? thr->valstack_bottom : consts2) + (x))) +#define DUK__REGCONSTP(x) ((DUK__RCISREG((x)) ? thr->valstack_bottom : consts2) + (x)) + +#ifdef DUK_USE_VERBOSE_EXECUTOR_ERRORS +#define DUK__INTERNAL_ERROR(msg) do { \ + DUK_ERROR_INTERNAL(thr, (msg)); \ + } while (0) +#else +#define DUK__INTERNAL_ERROR(msg) do { \ + goto internal_error; \ + } while (0) +#endif + +#define DUK__SYNC_CURR_PC() do { \ + duk_activation *act; \ + act = thr->callstack + thr->callstack_top - 1; \ + act->curr_pc = curr_pc; \ + } while (0) +#define DUK__SYNC_AND_NULL_CURR_PC() do { \ + duk_activation *act; \ + act = thr->callstack + thr->callstack_top - 1; \ + act->curr_pc = curr_pc; \ + thr->ptr_curr_pc = NULL; \ + } while (0) + +DUK_LOCAL void duk__handle_executor_error(duk_heap *heap, + duk_hthread *entry_thread, + duk_size_t entry_callstack_top, + duk_int_t entry_call_recursion_depth, + duk_jmpbuf *entry_jmpbuf_ptr) { + duk_small_uint_t lj_ret; + + /* Longjmp callers are required to sync-and-null thr->ptr_curr_pc + * before longjmp. + */ + DUK_ASSERT(heap->curr_thread != NULL); + DUK_ASSERT(heap->curr_thread->ptr_curr_pc == NULL); + + /* XXX: signalling the need to shrink check (only if unwound) */ + + /* Must be restored here to handle e.g. yields properly. */ + heap->call_recursion_depth = entry_call_recursion_depth; + + /* Switch to caller's setjmp() catcher so that if an error occurs + * during error handling, it is always propagated outwards instead + * of causing an infinite loop in our own handler. + */ + heap->lj.jmpbuf_ptr = (duk_jmpbuf *) entry_jmpbuf_ptr; + + lj_ret = duk__handle_longjmp(heap->curr_thread, entry_thread, entry_callstack_top); + + if (lj_ret == DUK__LONGJMP_RESTART) { + /* Restart bytecode execution, possibly with a changed thread. */ + ; + } else { + /* Rethrow error to calling state. */ + DUK_ASSERT(lj_ret == DUK__LONGJMP_RETHROW); + + /* Longjmp handling has restored jmpbuf_ptr. */ + DUK_ASSERT(heap->lj.jmpbuf_ptr == entry_jmpbuf_ptr); + + /* Thread may have changed, e.g. YIELD converted to THROW. */ + duk_err_longjmp(heap->curr_thread); + DUK_UNREACHABLE(); + } +} + +/* Outer executor with setjmp/longjmp handling. */ +DUK_INTERNAL void duk_js_execute_bytecode(duk_hthread *exec_thr) { + /* Entry level info. */ + duk_hthread *entry_thread; + duk_size_t entry_callstack_top; + duk_int_t entry_call_recursion_depth; + duk_jmpbuf *entry_jmpbuf_ptr; + duk_jmpbuf our_jmpbuf; + duk_heap *heap; + + DUK_ASSERT(exec_thr != NULL); + DUK_ASSERT(exec_thr->heap != NULL); + DUK_ASSERT(exec_thr->heap->curr_thread != NULL); + DUK_ASSERT_REFCOUNT_NONZERO_HEAPHDR((duk_heaphdr *) exec_thr); + DUK_ASSERT(exec_thr->callstack_top >= 1); /* at least one activation, ours */ + DUK_ASSERT(DUK_ACT_GET_FUNC(exec_thr->callstack + exec_thr->callstack_top - 1) != NULL); + DUK_ASSERT(DUK_HOBJECT_IS_COMPILEDFUNCTION(DUK_ACT_GET_FUNC(exec_thr->callstack + exec_thr->callstack_top - 1))); + + entry_thread = exec_thr; + heap = entry_thread->heap; + entry_callstack_top = entry_thread->callstack_top; + entry_call_recursion_depth = entry_thread->heap->call_recursion_depth; + entry_jmpbuf_ptr = entry_thread->heap->lj.jmpbuf_ptr; + + /* + * Note: we currently assume that the setjmp() catchpoint is + * not re-entrant (longjmp() cannot be called more than once + * for a single setjmp()). + * + * See doc/code-issues.rst for notes on variable assignment + * before and after setjmp(). + */ + + for (;;) { + heap->lj.jmpbuf_ptr = &our_jmpbuf; + DUK_ASSERT(heap->lj.jmpbuf_ptr != NULL); + +#if defined(DUK_USE_CPP_EXCEPTIONS) + try { +#else + DUK_ASSERT(heap->lj.jmpbuf_ptr == &our_jmpbuf); + if (DUK_SETJMP(our_jmpbuf.jb) == 0) { +#endif + /* Execute bytecode until returned or longjmp(). */ + duk__js_execute_bytecode_inner(entry_thread, entry_callstack_top); + + /* Successful return: restore jmpbuf and return to caller. */ + heap->lj.jmpbuf_ptr = entry_jmpbuf_ptr; + + return; +#if defined(DUK_USE_CPP_EXCEPTIONS) + } catch (duk_internal_exception &exc) { +#else + } else { +#endif +#if defined(DUK_USE_CPP_EXCEPTIONS) + DUK_UNREF(exc); +#endif + DUK_DDD(DUK_DDDPRINT("longjmp caught by bytecode executor")); + + duk__handle_executor_error(heap, + entry_thread, + entry_callstack_top, + entry_call_recursion_depth, + entry_jmpbuf_ptr); + } +#if defined(DUK_USE_CPP_EXCEPTIONS) + catch (std::exception &exc) { + const char *what = exc.what(); + if (!what) { + what = "unknown"; + } + DUK_D(DUK_DPRINT("unexpected c++ std::exception (perhaps thrown by user code)")); + try { + DUK_ASSERT(heap->curr_thread != NULL); + DUK_ERROR_FMT1(heap->curr_thread, DUK_ERR_API_ERROR, "caught invalid c++ std::exception '%s' (perhaps thrown by user code)", what); + } catch (duk_internal_exception exc) { + DUK_D(DUK_DPRINT("caught api error thrown from unexpected c++ std::exception")); + DUK_UNREF(exc); + duk__handle_executor_error(heap, + entry_thread, + entry_callstack_top, + entry_call_recursion_depth, + entry_jmpbuf_ptr); + } + } catch (...) { + DUK_D(DUK_DPRINT("unexpected c++ exception (perhaps thrown by user code)")); + try { + DUK_ASSERT(heap->curr_thread != NULL); + DUK_ERROR_API(heap->curr_thread, "caught invalid c++ exception (perhaps thrown by user code)"); + } catch (duk_internal_exception exc) { + DUK_D(DUK_DPRINT("caught api error thrown from unexpected c++ exception")); + DUK_UNREF(exc); + duk__handle_executor_error(heap, + entry_thread, + entry_callstack_top, + entry_call_recursion_depth, + entry_jmpbuf_ptr); + } + } +#endif + } + + DUK_UNREACHABLE(); +} + +/* Inner executor, performance critical. */ +DUK_LOCAL DUK_NOINLINE void duk__js_execute_bytecode_inner(duk_hthread *entry_thread, duk_size_t entry_callstack_top) { + /* Current PC, accessed by other functions through thr->ptr_to_curr_pc. + * Critical for performance. It would be safest to make this volatile, + * but that eliminates performance benefits; aliasing guarantees + * should be enough though. + */ + duk_instr_t *curr_pc; /* bytecode has a stable pointer */ + + /* Hot variables for interpretation. Critical for performance, + * but must add sparingly to minimize register shuffling. + */ + duk_hthread *thr; /* stable */ + duk_tval *consts; /* stable */ + duk_tval *consts2; /* stable; precalculated for faster lookups */ + duk_uint_fast32_t ins; + /* 'funcs' is quite rarely used, so no local for it */ +#if defined(DUK_USE_EXEC_FUN_LOCAL) + duk_hcompiledfunction *fun; +#else + /* 'fun' is quite rarely used, so no local for it */ +#endif + +#ifdef DUK_USE_INTERRUPT_COUNTER + duk_int_t int_ctr; +#endif + +#ifdef DUK_USE_ASSERTIONS + duk_size_t valstack_top_base; /* valstack top, should match before interpreting each op (no leftovers) */ +#endif + + /* + * Restart execution by reloading thread state. + * + * Note that 'thr' and any thread configuration may have changed, + * so all local variables are suspect and we need to reinitialize. + * + * The number of local variables should be kept to a minimum: if + * the variables are spilled, they will need to be loaded from + * memory anyway. + * + * Any 'goto restart_execution;' code path in opcode dispatch must + * ensure 'curr_pc' is synced back to act->curr_pc before the goto + * takes place. + * + * The interpreter must be very careful with memory pointers, as + * many pointers are not guaranteed to be 'stable' and may be + * reallocated and relocated on-the-fly quite easily (e.g. by a + * memory allocation or a property access). + * + * The following are assumed to have stable pointers: + * - the current thread + * - the current function + * - the bytecode, constant table, inner function table of the + * current function (as they are a part of the function allocation) + * + * The following are assumed to have semi-stable pointers: + * - the current activation entry: stable as long as callstack + * is not changed (reallocated by growing or shrinking), or + * by any garbage collection invocation (through finalizers) + * - Note in particular that ANY DECREF can invalidate the + * activation pointer, so for the most part a fresh lookup + * is required + * + * The following are not assumed to have stable pointers at all: + * - the value stack (registers) of the current thread + * - the catch stack of the current thread + * + * See execution.rst for discussion. + */ + + restart_execution: + + /* Lookup current thread; use the stable 'entry_thread' for this to + * avoid clobber warnings. Any valid, reachable 'thr' value would be + * fine for this, so using 'entry_thread' is just to silence warnings. + */ + thr = entry_thread->heap->curr_thread; + DUK_ASSERT(thr != NULL); + DUK_ASSERT(thr->callstack_top >= 1); + DUK_ASSERT(DUK_ACT_GET_FUNC(thr->callstack + thr->callstack_top - 1) != NULL); + DUK_ASSERT(DUK_HOBJECT_IS_COMPILEDFUNCTION(DUK_ACT_GET_FUNC(thr->callstack + thr->callstack_top - 1))); + + thr->ptr_curr_pc = &curr_pc; + + /* Relookup and initialize dispatch loop variables. Debugger check. */ + { + duk_activation *act; +#if !defined(DUK_USE_EXEC_FUN_LOCAL) + duk_hcompiledfunction *fun; +#endif + + /* Assume interrupt init/counter are properly initialized here. */ + /* Assume that thr->valstack_bottom has been set-up before getting here. */ + + act = thr->callstack + thr->callstack_top - 1; + fun = (duk_hcompiledfunction *) DUK_ACT_GET_FUNC(act); + DUK_ASSERT(fun != NULL); + DUK_ASSERT(thr->valstack_top - thr->valstack_bottom == fun->nregs); + consts = DUK_HCOMPILEDFUNCTION_GET_CONSTS_BASE(thr->heap, fun); + DUK_ASSERT(consts != NULL); + consts2 = consts - DUK_BC_REGLIMIT; + +#if defined(DUK_USE_DEBUGGER_SUPPORT) + if (DUK_HEAP_IS_DEBUGGER_ATTACHED(thr->heap) && !thr->heap->dbg_processing) { + duk__executor_recheck_debugger(thr, act, fun); + act = thr->callstack + thr->callstack_top - 1; /* relookup after side effects (no side effects currently however) */ + } +#endif /* DUK_USE_DEBUGGER_SUPPORT */ + +#ifdef DUK_USE_ASSERTIONS + valstack_top_base = (duk_size_t) (thr->valstack_top - thr->valstack); +#endif + + /* Set up curr_pc for opcode dispatch. */ + curr_pc = act->curr_pc; + } + + DUK_DD(DUK_DDPRINT("restarting execution, thr %p, act idx %ld, fun %p," + "consts %p, funcs %p, lev %ld, regbot %ld, regtop %ld, catchstack_top=%ld, " + "preventcount=%ld", + (void *) thr, + (long) (thr->callstack_top - 1), + (void *) DUK__FUN(), + (void *) DUK_HCOMPILEDFUNCTION_GET_CONSTS_BASE(thr->heap, DUK__FUN()), + (void *) DUK_HCOMPILEDFUNCTION_GET_FUNCS_BASE(thr->heap, DUK__FUN()), + (long) (thr->callstack_top - 1), + (long) (thr->valstack_bottom - thr->valstack), + (long) (thr->valstack_top - thr->valstack), + (long) thr->catchstack_top, + (long) thr->callstack_preventcount)); + + /* Dispatch loop. */ + + for (;;) { + DUK_ASSERT(thr->callstack_top >= 1); + DUK_ASSERT(thr->valstack_top - thr->valstack_bottom == DUK__FUN()->nregs); + DUK_ASSERT((duk_size_t) (thr->valstack_top - thr->valstack) == valstack_top_base); + + /* Executor interrupt counter check, used to implement breakpoints, + * debugging interface, execution timeouts, etc. The counter is heap + * specific but is maintained in the current thread to make the check + * as fast as possible. The counter is copied back to the heap struct + * whenever a thread switch occurs by the DUK_HEAP_SWITCH_THREAD() macro. + */ +#if defined(DUK_USE_INTERRUPT_COUNTER) + int_ctr = thr->interrupt_counter; + if (DUK_LIKELY(int_ctr > 0)) { + thr->interrupt_counter = int_ctr - 1; + } else { + /* Trigger at zero or below */ + duk_small_uint_t exec_int_ret; + + /* Write curr_pc back for the debugger. */ + DUK_ASSERT(thr->callstack_top > 0); + { + duk_activation *act; + act = thr->callstack + thr->callstack_top - 1; + act->curr_pc = (duk_instr_t *) curr_pc; + } + + /* Force restart caused by a function return; must recheck + * debugger breakpoints before checking line transitions, + * see GH-303. Restart and then handle interrupt_counter + * zero again. + */ +#if defined(DUK_USE_DEBUGGER_SUPPORT) + if (thr->heap->dbg_force_restart) { + DUK_DD(DUK_DDPRINT("dbg_force_restart flag forced restart execution")); /* GH-303 */ + thr->heap->dbg_force_restart = 0; + goto restart_execution; + } +#endif + + exec_int_ret = duk__executor_interrupt(thr); + if (exec_int_ret == DUK__INT_RESTART) { + /* curr_pc synced back above */ + goto restart_execution; + } + } +#endif /* DUK_USE_INTERRUPT_COUNTER */ +#if defined(DUK_USE_INTERRUPT_COUNTER) && defined(DUK_USE_DEBUG) + /* For cross-checking during development: ensure dispatch count + * matches cumulative interrupt counter init value sums. + */ + thr->heap->inst_count_exec++; +#endif + +#if defined(DUK_USE_ASSERTIONS) || defined(DUK_USE_DEBUG) + { + duk_activation *act; + act = thr->callstack + thr->callstack_top - 1; + DUK_ASSERT(curr_pc >= DUK_HCOMPILEDFUNCTION_GET_CODE_BASE(thr->heap, DUK__FUN())); + DUK_ASSERT(curr_pc < DUK_HCOMPILEDFUNCTION_GET_CODE_END(thr->heap, DUK__FUN())); + DUK_UNREF(act); /* if debugging disabled */ + + DUK_DDD(DUK_DDDPRINT("executing bytecode: pc=%ld, ins=0x%08lx, op=%ld, valstack_top=%ld/%ld, nregs=%ld --> %!I", + (long) (curr_pc - DUK_HCOMPILEDFUNCTION_GET_CODE_BASE(thr->heap, DUK__FUN())), + (unsigned long) *curr_pc, + (long) DUK_DEC_OP(*curr_pc), + (long) (thr->valstack_top - thr->valstack), + (long) (thr->valstack_end - thr->valstack), + (long) (DUK__FUN() ? DUK__FUN()->nregs : -1), + (duk_instr_t) *curr_pc)); + } +#endif + +#if defined(DUK_USE_ASSERTIONS) + /* Quite heavy assert: check valstack policy. Improper + * shuffle instructions can write beyond valstack_top/end + * so this check catches them in the act. + */ + { + duk_tval *tv; + tv = thr->valstack_top; + while (tv != thr->valstack_end) { + DUK_ASSERT(DUK_TVAL_IS_UNDEFINED(tv)); + tv++; + } + } +#endif + + ins = *curr_pc++; + + /* Typing: use duk_small_(u)int_fast_t when decoding small + * opcode fields (op, A, B, C) and duk_(u)int_fast_t when + * decoding larger fields (e.g. BC which is 18 bits). Use + * unsigned variant by default, signed when the value is used + * in signed arithmetic. Using variable names such as 'a', 'b', + * 'c', 'bc', etc makes it easier to spot typing mismatches. + */ + + /* XXX: the best typing needs to be validated by perf measurement: + * e.g. using a small type which is the cast to a larger duk_idx_t + * may be slower than declaring the variable as a duk_idx_t in the + * first place. + */ + + /* XXX: use macros for the repetitive tval/refcount handling. */ + + switch ((int) DUK_DEC_OP(ins)) { + /* XXX: switch cast? */ + + case DUK_OP_LDREG: { + duk_small_uint_fast_t a; + duk_uint_fast_t bc; + duk_tval *tv1, *tv2; + + a = DUK_DEC_A(ins); tv1 = DUK__REGP(a); + bc = DUK_DEC_BC(ins); tv2 = DUK__REGP(bc); + DUK_TVAL_SET_TVAL_UPDREF_FAST(thr, tv1, tv2); /* side effects */ + break; + } + + case DUK_OP_STREG: { + duk_small_uint_fast_t a; + duk_uint_fast_t bc; + duk_tval *tv1, *tv2; + + a = DUK_DEC_A(ins); tv1 = DUK__REGP(a); + bc = DUK_DEC_BC(ins); tv2 = DUK__REGP(bc); + DUK_TVAL_SET_TVAL_UPDREF_FAST(thr, tv2, tv1); /* side effects */ + break; + } + + case DUK_OP_LDCONST: { + duk_small_uint_fast_t a; + duk_uint_fast_t bc; + duk_tval *tv1, *tv2; + + a = DUK_DEC_A(ins); tv1 = DUK__REGP(a); + bc = DUK_DEC_BC(ins); tv2 = DUK__CONSTP(bc); + DUK_TVAL_SET_TVAL_UPDREF_FAST(thr, tv1, tv2); /* side effects */ + break; + } + + case DUK_OP_LDINT: { + duk_small_uint_fast_t a; + duk_int_fast_t bc; + duk_tval *tv1; +#if defined(DUK_USE_FASTINT) + duk_int32_t val; +#else + duk_double_t val; +#endif + +#if defined(DUK_USE_FASTINT) + a = DUK_DEC_A(ins); tv1 = DUK__REGP(a); + bc = DUK_DEC_BC(ins); val = (duk_int32_t) (bc - DUK_BC_LDINT_BIAS); + DUK_TVAL_SET_FASTINT_I32_UPDREF(thr, tv1, val); /* side effects */ +#else + a = DUK_DEC_A(ins); tv1 = DUK__REGP(a); + bc = DUK_DEC_BC(ins); val = (duk_double_t) (bc - DUK_BC_LDINT_BIAS); + DUK_TVAL_SET_NUMBER_UPDREF(thr, tv1, val); /* side effects */ +#endif + break; + } + + case DUK_OP_LDINTX: { + duk_small_uint_fast_t a; + duk_tval *tv1; + duk_double_t val; + + /* LDINTX is not necessarily in FASTINT range, so + * no fast path for now. + * + * XXX: perhaps restrict LDINTX to fastint range, wider + * range very rarely needed. + */ + + a = DUK_DEC_A(ins); tv1 = DUK__REGP(a); + DUK_ASSERT(DUK_TVAL_IS_NUMBER(tv1)); + val = DUK_TVAL_GET_NUMBER(tv1) * ((duk_double_t) (1L << DUK_BC_LDINTX_SHIFT)) + + (duk_double_t) DUK_DEC_BC(ins); +#if defined(DUK_USE_FASTINT) + DUK_TVAL_SET_NUMBER_CHKFAST(tv1, val); +#else + DUK_TVAL_SET_NUMBER(tv1, val); +#endif + break; + } + + case DUK_OP_MPUTOBJ: + case DUK_OP_MPUTOBJI: { + duk_context *ctx = (duk_context *) thr; + duk_small_uint_fast_t a; + duk_tval *tv1; + duk_hobject *obj; + duk_uint_fast_t idx; + duk_small_uint_fast_t count; + + /* A -> register of target object + * B -> first register of key/value pair list + * C -> number of key/value pairs + */ + + a = DUK_DEC_A(ins); tv1 = DUK__REGP(a); + DUK_ASSERT(DUK_TVAL_IS_OBJECT(tv1)); + obj = DUK_TVAL_GET_OBJECT(tv1); + + idx = (duk_uint_fast_t) DUK_DEC_B(ins); + if (DUK_DEC_OP(ins) == DUK_OP_MPUTOBJI) { + duk_tval *tv_ind = DUK__REGP(idx); + DUK_ASSERT(DUK_TVAL_IS_NUMBER(tv_ind)); + idx = (duk_uint_fast_t) DUK_TVAL_GET_NUMBER(tv_ind); + } + + count = (duk_small_uint_fast_t) DUK_DEC_C(ins); + +#if defined(DUK_USE_EXEC_INDIRECT_BOUND_CHECK) + if (DUK_UNLIKELY(idx + count * 2 > (duk_uint_fast_t) duk_get_top(ctx))) { + /* XXX: use duk_is_valid_index() instead? */ + /* XXX: improve check; check against nregs, not against top */ + DUK__INTERNAL_ERROR("MPUTOBJ out of bounds"); + } +#endif + + duk_push_hobject(ctx, obj); + + while (count > 0) { + /* XXX: faster initialization (direct access or better primitives) */ + + duk_push_tval(ctx, DUK__REGP(idx)); + DUK_ASSERT(duk_is_string(ctx, -1)); + duk_push_tval(ctx, DUK__REGP(idx + 1)); /* -> [... obj key value] */ + duk_xdef_prop_wec(ctx, -3); /* -> [... obj] */ + + count--; + idx += 2; + } + + duk_pop(ctx); /* [... obj] -> [...] */ + break; + } + + case DUK_OP_MPUTARR: + case DUK_OP_MPUTARRI: { + duk_context *ctx = (duk_context *) thr; + duk_small_uint_fast_t a; + duk_tval *tv1; + duk_hobject *obj; + duk_uint_fast_t idx; + duk_small_uint_fast_t count; + duk_uint32_t arr_idx; + + /* A -> register of target object + * B -> first register of value data (start_index, value1, value2, ..., valueN) + * C -> number of key/value pairs (N) + */ + + a = DUK_DEC_A(ins); tv1 = DUK__REGP(a); + DUK_ASSERT(DUK_TVAL_IS_OBJECT(tv1)); + obj = DUK_TVAL_GET_OBJECT(tv1); + DUK_ASSERT(obj != NULL); + + idx = (duk_uint_fast_t) DUK_DEC_B(ins); + if (DUK_DEC_OP(ins) == DUK_OP_MPUTARRI) { + duk_tval *tv_ind = DUK__REGP(idx); + DUK_ASSERT(DUK_TVAL_IS_NUMBER(tv_ind)); + idx = (duk_uint_fast_t) DUK_TVAL_GET_NUMBER(tv_ind); + } + + count = (duk_small_uint_fast_t) DUK_DEC_C(ins); + +#if defined(DUK_USE_EXEC_INDIRECT_BOUND_CHECK) + if (idx + count + 1 > (duk_uint_fast_t) duk_get_top(ctx)) { + /* XXX: use duk_is_valid_index() instead? */ + /* XXX: improve check; check against nregs, not against top */ + DUK__INTERNAL_ERROR("MPUTARR out of bounds"); + } +#endif + + tv1 = DUK__REGP(idx); + DUK_ASSERT(DUK_TVAL_IS_NUMBER(tv1)); + arr_idx = (duk_uint32_t) DUK_TVAL_GET_NUMBER(tv1); + idx++; + + duk_push_hobject(ctx, obj); + + while (count > 0) { + /* duk_xdef_prop() will define an own property without any array + * special behaviors. We'll need to set the array length explicitly + * in the end. For arrays with elisions, the compiler will emit an + * explicit SETALEN which will update the length. + */ + + /* XXX: because we're dealing with 'own' properties of a fresh array, + * the array initializer should just ensure that the array has a large + * enough array part and write the values directly into array part, + * and finally set 'length' manually in the end (as already happens now). + */ + + duk_push_tval(ctx, DUK__REGP(idx)); /* -> [... obj value] */ + duk_xdef_prop_index_wec(ctx, -2, arr_idx); /* -> [... obj] */ + + /* XXX: could use at least one fewer loop counters */ + count--; + idx++; + arr_idx++; + } + + /* XXX: E5.1 Section 11.1.4 coerces the final length through + * ToUint32() which is odd but happens now as a side effect of + * 'arr_idx' type. + */ + duk_hobject_set_length(thr, obj, (duk_uint32_t) arr_idx); + + duk_pop(ctx); /* [... obj] -> [...] */ + break; + } + + case DUK_OP_NEW: + case DUK_OP_NEWI: { + duk_context *ctx = (duk_context *) thr; + duk_small_uint_fast_t c = DUK_DEC_C(ins); + duk_uint_fast_t idx; + duk_small_uint_fast_t i; + + /* A -> unused (reserved for flags, for consistency with DUK_OP_CALL) + * B -> target register and start reg: constructor, arg1, ..., argN + * (for DUK_OP_NEWI, 'b' is indirect) + * C -> num args (N) + */ + + /* duk_new() will call the constuctor using duk_handle_call(). + * A constructor call prevents a yield from inside the constructor, + * even if the constructor is an Ecmascript function. + */ + + /* Don't need to sync curr_pc here; duk_new() will do that + * when it augments the created error. + */ + + /* XXX: unnecessary copying of values? Just set 'top' to + * b + c, and let the return handling fix up the stack frame? + */ + + idx = (duk_uint_fast_t) DUK_DEC_B(ins); + if (DUK_DEC_OP(ins) == DUK_OP_NEWI) { + duk_tval *tv_ind = DUK__REGP(idx); + DUK_ASSERT(DUK_TVAL_IS_NUMBER(tv_ind)); + idx = (duk_uint_fast_t) DUK_TVAL_GET_NUMBER(tv_ind); + } + +#if defined(DUK_USE_EXEC_INDIRECT_BOUND_CHECK) + if (idx + c + 1 > (duk_uint_fast_t) duk_get_top(ctx)) { + /* XXX: use duk_is_valid_index() instead? */ + /* XXX: improve check; check against nregs, not against top */ + DUK__INTERNAL_ERROR("NEW out of bounds"); + } +#endif + + duk_require_stack(ctx, (duk_idx_t) c); + duk_push_tval(ctx, DUK__REGP(idx)); + for (i = 0; i < c; i++) { + duk_push_tval(ctx, DUK__REGP(idx + i + 1)); + } + duk_new(ctx, (duk_idx_t) c); /* [... constructor arg1 ... argN] -> [retval] */ + DUK_DDD(DUK_DDDPRINT("NEW -> %!iT", (duk_tval *) duk_get_tval(ctx, -1))); + duk_replace(ctx, (duk_idx_t) idx); + + /* When debugger is enabled, we need to recheck the activation + * status after returning. This is now handled by call handling + * and heap->dbg_force_restart. + */ + break; + } + + case DUK_OP_REGEXP: { +#ifdef DUK_USE_REGEXP_SUPPORT + duk_context *ctx = (duk_context *) thr; + duk_small_uint_fast_t a = DUK_DEC_A(ins); + duk_small_uint_fast_t b = DUK_DEC_B(ins); + duk_small_uint_fast_t c = DUK_DEC_C(ins); + + /* A -> target register + * B -> bytecode (also contains flags) + * C -> escaped source + */ + + duk_push_tval(ctx, DUK__REGCONSTP(c)); + duk_push_tval(ctx, DUK__REGCONSTP(b)); /* -> [ ... escaped_source bytecode ] */ + duk_regexp_create_instance(thr); /* -> [ ... regexp_instance ] */ + DUK_DDD(DUK_DDDPRINT("regexp instance: %!iT", (duk_tval *) duk_get_tval(ctx, -1))); + duk_replace(ctx, (duk_idx_t) a); +#else + /* The compiler should never emit DUK_OP_REGEXP if there is no + * regexp support. + */ + DUK__INTERNAL_ERROR("no regexp support"); +#endif + + break; + } + + case DUK_OP_CSREG: + case DUK_OP_CSREGI: { + /* + * Assuming a register binds to a variable declared within this + * function (a declarative binding), the 'this' for the call + * setup is always 'undefined'. E5 Section 10.2.1.1.6. + */ + + duk_context *ctx = (duk_context *) thr; + duk_small_uint_fast_t b = DUK_DEC_B(ins); /* restricted to regs */ + duk_uint_fast_t idx; + + /* A -> target register (A, A+1) for call setup + * (for DUK_OP_CSREGI, 'a' is indirect) + * B -> register containing target function (not type checked here) + */ + + /* XXX: direct manipulation, or duk_replace_tval() */ + + /* Note: target registers a and a+1 may overlap with DUK__REGP(b). + * Careful here. + */ + + idx = (duk_uint_fast_t) DUK_DEC_A(ins); + if (DUK_DEC_OP(ins) == DUK_OP_CSREGI) { + duk_tval *tv_ind = DUK__REGP(idx); + DUK_ASSERT(DUK_TVAL_IS_NUMBER(tv_ind)); + idx = (duk_uint_fast_t) DUK_TVAL_GET_NUMBER(tv_ind); + } + +#if defined(DUK_USE_EXEC_INDIRECT_BOUND_CHECK) + if (idx + 2 > (duk_uint_fast_t) duk_get_top(ctx)) { + /* XXX: use duk_is_valid_index() instead? */ + /* XXX: improve check; check against nregs, not against top */ + DUK__INTERNAL_ERROR("CSREG out of bounds"); + } +#endif + + duk_push_tval(ctx, DUK__REGP(b)); + duk_replace(ctx, (duk_idx_t) idx); + duk_push_undefined(ctx); + duk_replace(ctx, (duk_idx_t) (idx + 1)); + break; + } + + case DUK_OP_GETVAR: { + duk_context *ctx = (duk_context *) thr; + duk_activation *act; + duk_small_uint_fast_t a = DUK_DEC_A(ins); + duk_uint_fast_t bc = DUK_DEC_BC(ins); + duk_tval *tv1; + duk_hstring *name; + + tv1 = DUK__CONSTP(bc); + DUK_ASSERT(DUK_TVAL_IS_STRING(tv1)); + name = DUK_TVAL_GET_STRING(tv1); + DUK_ASSERT(name != NULL); + DUK_DDD(DUK_DDDPRINT("GETVAR: '%!O'", (duk_heaphdr *) name)); + act = thr->callstack + thr->callstack_top - 1; + (void) duk_js_getvar_activation(thr, act, name, 1 /*throw*/); /* -> [... val this] */ + + duk_pop(ctx); /* 'this' binding is not needed here */ + duk_replace(ctx, (duk_idx_t) a); + break; + } + + case DUK_OP_PUTVAR: { + duk_activation *act; + duk_small_uint_fast_t a = DUK_DEC_A(ins); + duk_uint_fast_t bc = DUK_DEC_BC(ins); + duk_tval *tv1; + duk_hstring *name; + + tv1 = DUK__CONSTP(bc); + DUK_ASSERT(DUK_TVAL_IS_STRING(tv1)); + name = DUK_TVAL_GET_STRING(tv1); + DUK_ASSERT(name != NULL); + + /* XXX: putvar takes a duk_tval pointer, which is awkward and + * should be reworked. + */ + + tv1 = DUK__REGP(a); /* val */ + act = thr->callstack + thr->callstack_top - 1; + duk_js_putvar_activation(thr, act, name, tv1, DUK__STRICT()); + break; + } + + case DUK_OP_DECLVAR: { + duk_activation *act; + duk_context *ctx = (duk_context *) thr; + duk_small_uint_fast_t a = DUK_DEC_A(ins); + duk_small_uint_fast_t b = DUK_DEC_B(ins); + duk_small_uint_fast_t c = DUK_DEC_C(ins); + duk_tval *tv1; + duk_hstring *name; + duk_small_uint_t prop_flags; + duk_bool_t is_func_decl; + duk_bool_t is_undef_value; + + tv1 = DUK__REGCONSTP(b); + DUK_ASSERT(DUK_TVAL_IS_STRING(tv1)); + name = DUK_TVAL_GET_STRING(tv1); + DUK_ASSERT(name != NULL); + + is_undef_value = ((a & DUK_BC_DECLVAR_FLAG_UNDEF_VALUE) != 0); + is_func_decl = ((a & DUK_BC_DECLVAR_FLAG_FUNC_DECL) != 0); + + /* XXX: declvar takes an duk_tval pointer, which is awkward and + * should be reworked. + */ + + /* Compiler is responsible for selecting property flags (configurability, + * writability, etc). + */ + prop_flags = a & DUK_PROPDESC_FLAGS_MASK; + + if (is_undef_value) { + duk_push_undefined(ctx); + } else { + duk_push_tval(ctx, DUK__REGCONSTP(c)); + } + tv1 = DUK_GET_TVAL_NEGIDX(ctx, -1); + + act = thr->callstack + thr->callstack_top - 1; + if (duk_js_declvar_activation(thr, act, name, tv1, prop_flags, is_func_decl)) { + if (is_undef_value) { + /* Already declared but no initializer value + * (e.g. 'var xyz;'), no-op. + */ + } else { + /* Already declared, update value. */ + tv1 = DUK_GET_TVAL_NEGIDX(ctx, -1); + duk_js_putvar_activation(thr, act, name, tv1, DUK__STRICT()); + } + } + + duk_pop(ctx); + break; + } + + case DUK_OP_DELVAR: { + duk_activation *act; + duk_context *ctx = (duk_context *) thr; + duk_small_uint_fast_t a = DUK_DEC_A(ins); + duk_small_uint_fast_t b = DUK_DEC_B(ins); + duk_tval *tv1; + duk_hstring *name; + duk_bool_t rc; + + tv1 = DUK__REGCONSTP(b); + DUK_ASSERT(DUK_TVAL_IS_STRING(tv1)); + name = DUK_TVAL_GET_STRING(tv1); + DUK_ASSERT(name != NULL); + DUK_DDD(DUK_DDDPRINT("DELVAR '%!O'", (duk_heaphdr *) name)); + act = thr->callstack + thr->callstack_top - 1; + rc = duk_js_delvar_activation(thr, act, name); + + duk_push_boolean(ctx, rc); + duk_replace(ctx, (duk_idx_t) a); + break; + } + + case DUK_OP_CSVAR: + case DUK_OP_CSVARI: { + /* 'this' value: + * E5 Section 6.b.i + * + * The only (standard) case where the 'this' binding is non-null is when + * (1) the variable is found in an object environment record, and + * (2) that object environment record is a 'with' block. + * + */ + + duk_context *ctx = (duk_context *) thr; + duk_activation *act; + duk_small_uint_fast_t b = DUK_DEC_B(ins); + duk_uint_fast_t idx; + duk_tval *tv1; + duk_hstring *name; + + tv1 = DUK__REGCONSTP(b); + DUK_ASSERT(DUK_TVAL_IS_STRING(tv1)); + name = DUK_TVAL_GET_STRING(tv1); + DUK_ASSERT(name != NULL); + act = thr->callstack + thr->callstack_top - 1; + (void) duk_js_getvar_activation(thr, act, name, 1 /*throw*/); /* -> [... val this] */ + + /* Note: target registers a and a+1 may overlap with DUK__REGCONSTP(b) + * and DUK__REGCONSTP(c). Careful here. + */ + + idx = (duk_uint_fast_t) DUK_DEC_A(ins); + if (DUK_DEC_OP(ins) == DUK_OP_CSVARI) { + duk_tval *tv_ind = DUK__REGP(idx); + DUK_ASSERT(DUK_TVAL_IS_NUMBER(tv_ind)); + idx = (duk_uint_fast_t) DUK_TVAL_GET_NUMBER(tv_ind); + } + +#if defined(DUK_USE_EXEC_INDIRECT_BOUND_CHECK) + if (idx + 2 > (duk_uint_fast_t) duk_get_top(ctx)) { + /* XXX: use duk_is_valid_index() instead? */ + /* XXX: improve check; check against nregs, not against top */ + DUK__INTERNAL_ERROR("CSVAR out of bounds"); + } +#endif + + duk_replace(ctx, (duk_idx_t) (idx + 1)); /* 'this' binding */ + duk_replace(ctx, (duk_idx_t) idx); /* variable value (function, we hope, not checked here) */ + break; + } + + case DUK_OP_CLOSURE: { + duk_context *ctx = (duk_context *) thr; + duk_activation *act; + duk_hcompiledfunction *fun; + duk_small_uint_fast_t a = DUK_DEC_A(ins); + duk_uint_fast_t bc = DUK_DEC_BC(ins); + duk_hobject *fun_temp; + + /* A -> target reg + * BC -> inner function index + */ + + DUK_DDD(DUK_DDDPRINT("CLOSURE to target register %ld, fnum %ld (count %ld)", + (long) a, (long) bc, (long) DUK_HCOMPILEDFUNCTION_GET_FUNCS_COUNT(thr->heap, DUK__FUN()))); + + DUK_ASSERT_DISABLE(bc >= 0); /* unsigned */ + DUK_ASSERT((duk_uint_t) bc < (duk_uint_t) DUK_HCOMPILEDFUNCTION_GET_FUNCS_COUNT(thr->heap, DUK__FUN())); + + act = thr->callstack + thr->callstack_top - 1; + fun = (duk_hcompiledfunction *) DUK_ACT_GET_FUNC(act); + fun_temp = DUK_HCOMPILEDFUNCTION_GET_FUNCS_BASE(thr->heap, fun)[bc]; + DUK_ASSERT(fun_temp != NULL); + DUK_ASSERT(DUK_HOBJECT_IS_COMPILEDFUNCTION(fun_temp)); + + DUK_DDD(DUK_DDDPRINT("CLOSURE: function template is: %p -> %!O", + (void *) fun_temp, (duk_heaphdr *) fun_temp)); + + if (act->lex_env == NULL) { + DUK_ASSERT(act->var_env == NULL); + duk_js_init_activation_environment_records_delayed(thr, act); + act = thr->callstack + thr->callstack_top - 1; + } + DUK_ASSERT(act->lex_env != NULL); + DUK_ASSERT(act->var_env != NULL); + + /* functions always have a NEWENV flag, i.e. they get a + * new variable declaration environment, so only lex_env + * matters here. + */ + duk_js_push_closure(thr, + (duk_hcompiledfunction *) fun_temp, + act->var_env, + act->lex_env, + 1 /*add_auto_proto*/); + duk_replace(ctx, (duk_idx_t) a); + + break; + } + + case DUK_OP_GETPROP: { + duk_context *ctx = (duk_context *) thr; + duk_small_uint_fast_t a = DUK_DEC_A(ins); + duk_small_uint_fast_t b = DUK_DEC_B(ins); + duk_small_uint_fast_t c = DUK_DEC_C(ins); + duk_tval *tv_obj; + duk_tval *tv_key; + duk_bool_t rc; + + /* A -> target reg + * B -> object reg/const (may be const e.g. in "'foo'[1]") + * C -> key reg/const + */ + + tv_obj = DUK__REGCONSTP(b); + tv_key = DUK__REGCONSTP(c); + DUK_DDD(DUK_DDDPRINT("GETPROP: a=%ld obj=%!T, key=%!T", + (long) a, + (duk_tval *) DUK__REGCONSTP(b), + (duk_tval *) DUK__REGCONSTP(c))); + rc = duk_hobject_getprop(thr, tv_obj, tv_key); /* -> [val] */ + DUK_UNREF(rc); /* ignore */ + DUK_DDD(DUK_DDDPRINT("GETPROP --> %!T", + (duk_tval *) duk_get_tval(ctx, -1))); + tv_obj = NULL; /* invalidated */ + tv_key = NULL; /* invalidated */ + + duk_replace(ctx, (duk_idx_t) a); /* val */ + break; + } + + case DUK_OP_PUTPROP: { + duk_small_uint_fast_t a = DUK_DEC_A(ins); + duk_small_uint_fast_t b = DUK_DEC_B(ins); + duk_small_uint_fast_t c = DUK_DEC_C(ins); + duk_tval *tv_obj; + duk_tval *tv_key; + duk_tval *tv_val; + duk_bool_t rc; + + /* A -> object reg + * B -> key reg/const + * C -> value reg/const + * + * Note: intentional difference to register arrangement + * of e.g. GETPROP; 'A' must contain a register-only value. + */ + + tv_obj = DUK__REGP(a); + tv_key = DUK__REGCONSTP(b); + tv_val = DUK__REGCONSTP(c); + DUK_DDD(DUK_DDDPRINT("PUTPROP: obj=%!T, key=%!T, val=%!T", + (duk_tval *) DUK__REGP(a), + (duk_tval *) DUK__REGCONSTP(b), + (duk_tval *) DUK__REGCONSTP(c))); + rc = duk_hobject_putprop(thr, tv_obj, tv_key, tv_val, DUK__STRICT()); + DUK_UNREF(rc); /* ignore */ + DUK_DDD(DUK_DDDPRINT("PUTPROP --> obj=%!T, key=%!T, val=%!T", + (duk_tval *) DUK__REGP(a), + (duk_tval *) DUK__REGCONSTP(b), + (duk_tval *) DUK__REGCONSTP(c))); + tv_obj = NULL; /* invalidated */ + tv_key = NULL; /* invalidated */ + tv_val = NULL; /* invalidated */ + + break; + } + + case DUK_OP_DELPROP: { + duk_context *ctx = (duk_context *) thr; + duk_small_uint_fast_t a = DUK_DEC_A(ins); + duk_small_uint_fast_t b = DUK_DEC_B(ins); + duk_small_uint_fast_t c = DUK_DEC_C(ins); + duk_tval *tv_obj; + duk_tval *tv_key; + duk_bool_t rc; + + /* A -> result reg + * B -> object reg + * C -> key reg/const + */ + + tv_obj = DUK__REGP(b); + tv_key = DUK__REGCONSTP(c); + rc = duk_hobject_delprop(thr, tv_obj, tv_key, DUK__STRICT()); + tv_obj = NULL; /* invalidated */ + tv_key = NULL; /* invalidated */ + + duk_push_boolean(ctx, rc); + duk_replace(ctx, (duk_idx_t) a); /* result */ + break; + } + + case DUK_OP_CSPROP: + case DUK_OP_CSPROPI: { + duk_context *ctx = (duk_context *) thr; + duk_small_uint_fast_t b = DUK_DEC_B(ins); + duk_small_uint_fast_t c = DUK_DEC_C(ins); + duk_uint_fast_t idx; + duk_tval *tv_obj; + duk_tval *tv_key; + duk_bool_t rc; + + /* E5 Section 11.2.3, step 6.a.i */ + /* E5 Section 10.4.3 */ + + /* XXX: allow object to be a const, e.g. in 'foo'.toString()? + * On the other hand, DUK_REGCONSTP() is slower and generates + * more code. + */ + + tv_obj = DUK__REGP(b); + tv_key = DUK__REGCONSTP(c); + rc = duk_hobject_getprop(thr, tv_obj, tv_key); /* -> [val] */ + DUK_UNREF(rc); /* unused */ + tv_obj = NULL; /* invalidated */ + tv_key = NULL; /* invalidated */ + + /* Note: target registers a and a+1 may overlap with DUK__REGP(b) + * and DUK__REGCONSTP(c). Careful here. + */ + + idx = (duk_uint_fast_t) DUK_DEC_A(ins); + if (DUK_DEC_OP(ins) == DUK_OP_CSPROPI) { + duk_tval *tv_ind = DUK__REGP(idx); + DUK_ASSERT(DUK_TVAL_IS_NUMBER(tv_ind)); + idx = (duk_uint_fast_t) DUK_TVAL_GET_NUMBER(tv_ind); + } + +#if defined(DUK_USE_EXEC_INDIRECT_BOUND_CHECK) + if (idx + 2 > (duk_uint_fast_t) duk_get_top(ctx)) { + /* XXX: use duk_is_valid_index() instead? */ + /* XXX: improve check; check against nregs, not against top */ + DUK__INTERNAL_ERROR("CSPROP out of bounds"); + } +#endif + + duk_push_tval(ctx, DUK__REGP(b)); /* [ ... val obj ] */ + duk_replace(ctx, (duk_idx_t) (idx + 1)); /* 'this' binding */ + duk_replace(ctx, (duk_idx_t) idx); /* val */ + break; + } + + case DUK_OP_ADD: + case DUK_OP_SUB: + case DUK_OP_MUL: + case DUK_OP_DIV: + case DUK_OP_MOD: { + duk_small_uint_fast_t a = DUK_DEC_A(ins); + duk_small_uint_fast_t b = DUK_DEC_B(ins); + duk_small_uint_fast_t c = DUK_DEC_C(ins); + duk_small_uint_fast_t op = DUK_DEC_OP(ins); + + if (op == DUK_OP_ADD) { + /* + * Handling DUK_OP_ADD this way is more compact (experimentally) + * than a separate case with separate argument decoding. + */ + duk__vm_arith_add(thr, DUK__REGCONSTP(b), DUK__REGCONSTP(c), a); + } else { + duk__vm_arith_binary_op(thr, DUK__REGCONSTP(b), DUK__REGCONSTP(c), a, op); + } + break; + } + + case DUK_OP_BAND: + case DUK_OP_BOR: + case DUK_OP_BXOR: + case DUK_OP_BASL: + case DUK_OP_BLSR: + case DUK_OP_BASR: { + duk_small_uint_fast_t a = DUK_DEC_A(ins); + duk_small_uint_fast_t b = DUK_DEC_B(ins); + duk_small_uint_fast_t c = DUK_DEC_C(ins); + duk_small_uint_fast_t op = DUK_DEC_OP(ins); + + duk__vm_bitwise_binary_op(thr, DUK__REGCONSTP(b), DUK__REGCONSTP(c), a, op); + break; + } + + case DUK_OP_EQ: + case DUK_OP_NEQ: { + duk_context *ctx = (duk_context *) thr; + duk_small_uint_fast_t a = DUK_DEC_A(ins); + duk_small_uint_fast_t b = DUK_DEC_B(ins); + duk_small_uint_fast_t c = DUK_DEC_C(ins); + duk_bool_t tmp; + + /* E5 Sections 11.9.1, 11.9.3 */ + tmp = duk_js_equals(thr, DUK__REGCONSTP(b), DUK__REGCONSTP(c)); + if (DUK_DEC_OP(ins) == DUK_OP_NEQ) { + tmp = !tmp; + } + duk_push_boolean(ctx, tmp); + duk_replace(ctx, (duk_idx_t) a); + break; + } + + case DUK_OP_SEQ: + case DUK_OP_SNEQ: { + duk_context *ctx = (duk_context *) thr; + duk_small_uint_fast_t a = DUK_DEC_A(ins); + duk_small_uint_fast_t b = DUK_DEC_B(ins); + duk_small_uint_fast_t c = DUK_DEC_C(ins); + duk_bool_t tmp; + + /* E5 Sections 11.9.1, 11.9.3 */ + tmp = duk_js_strict_equals(DUK__REGCONSTP(b), DUK__REGCONSTP(c)); + if (DUK_DEC_OP(ins) == DUK_OP_SNEQ) { + tmp = !tmp; + } + duk_push_boolean(ctx, tmp); + duk_replace(ctx, (duk_idx_t) a); + break; + } + + /* Note: combining comparison ops must be done carefully because + * of uncomparable values (NaN): it's not necessarily true that + * (x >= y) === !(x < y). Also, evaluation order matters, and + * although it would only seem to affect the compiler this is + * actually not the case, because there are also run-time coercions + * of the arguments (with potential side effects). + * + * XXX: can be combined; check code size. + */ + + case DUK_OP_GT: { + duk_context *ctx = (duk_context *) thr; + duk_small_uint_fast_t a = DUK_DEC_A(ins); + duk_small_uint_fast_t b = DUK_DEC_B(ins); + duk_small_uint_fast_t c = DUK_DEC_C(ins); + duk_bool_t tmp; + + /* x > y --> y < x */ + tmp = duk_js_compare_helper(thr, + DUK__REGCONSTP(c), /* y */ + DUK__REGCONSTP(b), /* x */ + 0); /* flags */ + + duk_push_boolean(ctx, tmp); + duk_replace(ctx, (duk_idx_t) a); + break; + } + + case DUK_OP_GE: { + duk_context *ctx = (duk_context *) thr; + duk_small_uint_fast_t a = DUK_DEC_A(ins); + duk_small_uint_fast_t b = DUK_DEC_B(ins); + duk_small_uint_fast_t c = DUK_DEC_C(ins); + duk_bool_t tmp; + + /* x >= y --> not (x < y) */ + tmp = duk_js_compare_helper(thr, + DUK__REGCONSTP(b), /* x */ + DUK__REGCONSTP(c), /* y */ + DUK_COMPARE_FLAG_EVAL_LEFT_FIRST | + DUK_COMPARE_FLAG_NEGATE); /* flags */ + + duk_push_boolean(ctx, tmp); + duk_replace(ctx, (duk_idx_t) a); + break; + } + + case DUK_OP_LT: { + duk_context *ctx = (duk_context *) thr; + duk_small_uint_fast_t a = DUK_DEC_A(ins); + duk_small_uint_fast_t b = DUK_DEC_B(ins); + duk_small_uint_fast_t c = DUK_DEC_C(ins); + duk_bool_t tmp; + + /* x < y */ + tmp = duk_js_compare_helper(thr, + DUK__REGCONSTP(b), /* x */ + DUK__REGCONSTP(c), /* y */ + DUK_COMPARE_FLAG_EVAL_LEFT_FIRST); /* flags */ + + duk_push_boolean(ctx, tmp); + duk_replace(ctx, (duk_idx_t) a); + break; + } + + case DUK_OP_LE: { + duk_context *ctx = (duk_context *) thr; + duk_small_uint_fast_t a = DUK_DEC_A(ins); + duk_small_uint_fast_t b = DUK_DEC_B(ins); + duk_small_uint_fast_t c = DUK_DEC_C(ins); + duk_bool_t tmp; + + /* x <= y --> not (x > y) --> not (y < x) */ + tmp = duk_js_compare_helper(thr, + DUK__REGCONSTP(c), /* y */ + DUK__REGCONSTP(b), /* x */ + DUK_COMPARE_FLAG_NEGATE); /* flags */ + + duk_push_boolean(ctx, tmp); + duk_replace(ctx, (duk_idx_t) a); + break; + } + + case DUK_OP_IF: { + duk_small_uint_fast_t a = DUK_DEC_A(ins); + duk_small_uint_fast_t b = DUK_DEC_B(ins); + duk_bool_t tmp; + + tmp = duk_js_toboolean(DUK__REGCONSTP(b)); + if (tmp == (duk_bool_t) a) { + /* if boolean matches A, skip next inst */ + curr_pc++; + } else { + ; + } + break; + } + + case DUK_OP_JUMP: { + duk_int_fast_t abc = DUK_DEC_ABC(ins); + + curr_pc += abc - DUK_BC_JUMP_BIAS; + break; + } + + case DUK_OP_RETURN: { + duk_context *ctx = (duk_context *) thr; + duk_small_uint_fast_t a = DUK_DEC_A(ins); + duk_small_uint_fast_t b = DUK_DEC_B(ins); + /* duk_small_uint_fast_t c = DUK_DEC_C(ins); */ + duk_small_uint_t ret_result; + + /* A -> flags + * B -> return value reg/const + * C -> currently unused + */ + + DUK__SYNC_AND_NULL_CURR_PC(); + + /* duk__handle_return() is guaranteed never to throw, except + * for potential out-of-memory situations which will then + * propagate out of the executor longjmp handler. + */ + + if (a & DUK_BC_RETURN_FLAG_HAVE_RETVAL) { + duk_push_tval(ctx, DUK__REGCONSTP(b)); + } else { + duk_push_undefined(ctx); + } + ret_result = duk__handle_return(thr, + entry_thread, + entry_callstack_top); + if (ret_result == DUK__RETHAND_RESTART) { + goto restart_execution; + } + DUK_ASSERT(ret_result == DUK__RETHAND_FINISHED); + + DUK_DDD(DUK_DDDPRINT("exiting executor after RETURN handling")); + return; + } + + case DUK_OP_CALL: + case DUK_OP_CALLI: { + duk_context *ctx = (duk_context *) thr; + duk_small_uint_fast_t a = DUK_DEC_A(ins); + duk_small_uint_fast_t c = DUK_DEC_C(ins); + duk_uint_fast_t idx; + duk_small_uint_t call_flags; + duk_small_uint_t flag_tailcall; + duk_small_uint_t flag_evalcall; + duk_tval *tv_func; + duk_hobject *obj_func; + duk_bool_t setup_rc; + duk_idx_t num_stack_args; +#if !defined(DUK_USE_EXEC_FUN_LOCAL) + duk_hcompiledfunction *fun; +#endif + + /* A -> flags + * B -> base register for call (base -> func, base+1 -> this, base+2 -> arg1 ... base+2+N-1 -> argN) + * (for DUK_OP_CALLI, 'b' is indirect) + * C -> nargs + */ + + /* these are not necessarily 0 or 1 (may be other non-zero), that's ok */ + flag_tailcall = (a & DUK_BC_CALL_FLAG_TAILCALL); + flag_evalcall = (a & DUK_BC_CALL_FLAG_EVALCALL); + + idx = (duk_uint_fast_t) DUK_DEC_B(ins); + if (DUK_DEC_OP(ins) == DUK_OP_CALLI) { + duk_tval *tv_ind = DUK__REGP(idx); + DUK_ASSERT(DUK_TVAL_IS_NUMBER(tv_ind)); + idx = (duk_uint_fast_t) DUK_TVAL_GET_NUMBER(tv_ind); + } + +#if defined(DUK_USE_EXEC_INDIRECT_BOUND_CHECK) + if (!duk_is_valid_index(ctx, (duk_idx_t) idx)) { + /* XXX: improve check; check against nregs, not against top */ + DUK__INTERNAL_ERROR("CALL out of bounds"); + } +#endif + + /* + * To determine whether to use an optimized Ecmascript-to-Ecmascript + * call, we need to know whether the final, non-bound function is an + * Ecmascript function. + * + * This is now implemented so that we start to do an ecma-to-ecma call + * setup which will resolve the bound chain as the first thing. If the + * final function is not eligible, the return value indicates that the + * ecma-to-ecma call is not possible. The setup will overwrite the call + * target at DUK__REGP(idx) with the final, non-bound function (which + * may be a lightfunc), and fudge arguments if necessary. + * + * XXX: If an ecma-to-ecma call is not possible, this initial call + * setup will do bound function chain resolution but won't do the + * "effective this binding" resolution which is quite confusing. + * Perhaps add a helper for doing bound function and effective this + * binding resolution - and call that explicitly? Ecma-to-ecma call + * setup and normal function handling can then assume this prestep has + * been done by the caller. + */ + + duk_set_top(ctx, (duk_idx_t) (idx + c + 2)); /* [ ... func this arg1 ... argN ] */ + + call_flags = 0; + if (flag_tailcall) { + /* We request a tail call, but in some corner cases + * call handling can decide that a tail call is + * actually not possible. + * See: test-bug-tailcall-preventyield-assert.c. + */ + call_flags |= DUK_CALL_FLAG_IS_TAILCALL; + } + + /* Compared to duk_handle_call(): + * - protected call: never + * - ignore recursion limit: never + */ + num_stack_args = c; + setup_rc = duk_handle_ecma_call_setup(thr, + num_stack_args, + call_flags); + + if (setup_rc) { + /* Ecma-to-ecma call possible, may or may not be a tail call. + * Avoid C recursion by being clever. + */ + DUK_DDD(DUK_DDDPRINT("ecma-to-ecma call setup possible, restart execution")); + /* curr_pc synced by duk_handle_ecma_call_setup() */ + goto restart_execution; + } + DUK_ASSERT(thr->ptr_curr_pc != NULL); /* restored if ecma-to-ecma setup fails */ + + DUK_DDD(DUK_DDDPRINT("ecma-to-ecma call not possible, target is native (may be lightfunc)")); + + /* Recompute argument count: bound function handling may have shifted. */ + num_stack_args = duk_get_top(ctx) - (idx + 2); + DUK_DDD(DUK_DDDPRINT("recomputed arg count: %ld\n", (long) num_stack_args)); + + tv_func = DUK__REGP(idx); /* Relookup if relocated */ + if (DUK_TVAL_IS_LIGHTFUNC(tv_func)) { + + call_flags = 0; /* not protected, respect reclimit, not constructor */ + + /* There is no eval() special handling here: eval() is never + * automatically converted to a lightfunc. + */ + DUK_ASSERT(DUK_TVAL_GET_LIGHTFUNC_FUNCPTR(tv_func) != duk_bi_global_object_eval); + + duk_handle_call_unprotected(thr, + num_stack_args, + call_flags); + + /* duk_js_call.c is required to restore the stack reserve + * so we only need to reset the top. + */ +#if !defined(DUK_USE_EXEC_FUN_LOCAL) + fun = DUK__FUN(); +#endif + duk_set_top(ctx, (duk_idx_t) fun->nregs); + + /* No need to reinit setjmp() catchpoint, as call handling + * will store and restore our state. + */ + } else { + /* Call setup checks callability. */ + DUK_ASSERT(DUK_TVAL_IS_OBJECT(tv_func)); + obj_func = DUK_TVAL_GET_OBJECT(tv_func); + DUK_ASSERT(obj_func != NULL); + DUK_ASSERT(!DUK_HOBJECT_HAS_BOUND(obj_func)); + + /* + * Other cases, use C recursion. + * + * If a tail call was requested we ignore it and execute a normal call. + * Since Duktape 0.11.0 the compiler emits a RETURN opcode even after + * a tail call to avoid test-bug-tailcall-thread-yield-resume.js. + * + * Direct eval call: (1) call target (before following bound function + * chain) is the built-in eval() function, and (2) call was made with + * the identifier 'eval'. + */ + + call_flags = 0; /* not protected, respect reclimit, not constructor */ + + if (DUK_HOBJECT_IS_NATIVEFUNCTION(obj_func) && + ((duk_hnativefunction *) obj_func)->func == duk_bi_global_object_eval) { + if (flag_evalcall) { + DUK_DDD(DUK_DDDPRINT("call target is eval, call identifier was 'eval' -> direct eval")); + call_flags |= DUK_CALL_FLAG_DIRECT_EVAL; + } else { + DUK_DDD(DUK_DDDPRINT("call target is eval, call identifier was not 'eval' -> indirect eval")); + } + } + + duk_handle_call_unprotected(thr, + num_stack_args, + call_flags); + + /* duk_js_call.c is required to restore the stack reserve + * so we only need to reset the top. + */ +#if !defined(DUK_USE_EXEC_FUN_LOCAL) + fun = DUK__FUN(); +#endif + duk_set_top(ctx, (duk_idx_t) fun->nregs); + + /* No need to reinit setjmp() catchpoint, as call handling + * will store and restore our state. + */ + } + + /* When debugger is enabled, we need to recheck the activation + * status after returning. This is now handled by call handling + * and heap->dbg_force_restart. + */ + break; + } + + case DUK_OP_TRYCATCH: { + duk_context *ctx = (duk_context *) thr; + duk_activation *act; + duk_catcher *cat; + duk_tval *tv1; + duk_small_uint_fast_t a; + duk_uint_fast_t bc; + + /* A -> flags + * BC -> reg_catch; base register for two registers used both during + * trycatch setup and when catch is triggered + * + * If DUK_BC_TRYCATCH_FLAG_CATCH_BINDING set: + * reg_catch + 0: catch binding variable name (string). + * Automatic declarative environment is established for + * the duration of the 'catch' clause. + * + * If DUK_BC_TRYCATCH_FLAG_WITH_BINDING set: + * reg_catch + 0: with 'target value', which is coerced to + * an object and then used as a bindind object for an + * environment record. The binding is initialized here, for + * the 'try' clause. + * + * Note that a TRYCATCH generated for a 'with' statement has no + * catch or finally parts. + */ + + /* XXX: TRYCATCH handling should be reworked to avoid creating + * an explicit scope unless it is actually needed (e.g. function + * instances or eval is executed inside the catch block). This + * rework is not trivial because the compiler doesn't have an + * intermediate representation. When the rework is done, the + * opcode format can also be made more straightforward. + */ + + /* XXX: side effect handling is quite awkward here */ + + DUK_DDD(DUK_DDDPRINT("TRYCATCH: reg_catch=%ld, have_catch=%ld, " + "have_finally=%ld, catch_binding=%ld, with_binding=%ld (flags=0x%02lx)", + (long) DUK_DEC_BC(ins), + (long) (DUK_DEC_A(ins) & DUK_BC_TRYCATCH_FLAG_HAVE_CATCH ? 1 : 0), + (long) (DUK_DEC_A(ins) & DUK_BC_TRYCATCH_FLAG_HAVE_FINALLY ? 1 : 0), + (long) (DUK_DEC_A(ins) & DUK_BC_TRYCATCH_FLAG_CATCH_BINDING ? 1 : 0), + (long) (DUK_DEC_A(ins) & DUK_BC_TRYCATCH_FLAG_WITH_BINDING ? 1 : 0), + (unsigned long) DUK_DEC_A(ins))); + + a = DUK_DEC_A(ins); + bc = DUK_DEC_BC(ins); + + act = thr->callstack + thr->callstack_top - 1; + DUK_ASSERT(thr->callstack_top >= 1); + + /* 'with' target must be created first, in case we run out of memory */ + /* XXX: refactor out? */ + + if (a & DUK_BC_TRYCATCH_FLAG_WITH_BINDING) { + DUK_DDD(DUK_DDDPRINT("need to initialize a with binding object")); + + if (act->lex_env == NULL) { + DUK_ASSERT(act->var_env == NULL); + DUK_DDD(DUK_DDDPRINT("delayed environment initialization")); + + /* must relookup act in case of side effects */ + duk_js_init_activation_environment_records_delayed(thr, act); + act = thr->callstack + thr->callstack_top - 1; + DUK_UNREF(act); /* 'act' is no longer accessed, scanbuild fix */ + } + DUK_ASSERT(act->lex_env != NULL); + DUK_ASSERT(act->var_env != NULL); + + (void) duk_push_object_helper(ctx, + DUK_HOBJECT_FLAG_EXTENSIBLE | + DUK_HOBJECT_CLASS_AS_FLAGS(DUK_HOBJECT_CLASS_OBJENV), + -1); /* no prototype, updated below */ + + duk_push_tval(ctx, DUK__REGP(bc)); + duk_to_object(ctx, -1); + duk_dup(ctx, -1); + + /* [ ... env target ] */ + /* [ ... env target target ] */ + + duk_xdef_prop_stridx(thr, -3, DUK_STRIDX_INT_TARGET, DUK_PROPDESC_FLAGS_NONE); + duk_xdef_prop_stridx(thr, -2, DUK_STRIDX_INT_THIS, DUK_PROPDESC_FLAGS_NONE); /* always provideThis=true */ + + /* [ ... env ] */ + + DUK_DDD(DUK_DDDPRINT("environment for with binding: %!iT", + (duk_tval *) duk_get_tval(ctx, -1))); + } + + /* allocate catcher and populate it (should be atomic) */ + + duk_hthread_catchstack_grow(thr); + cat = thr->catchstack + thr->catchstack_top; + DUK_ASSERT(thr->catchstack_top + 1 <= thr->catchstack_size); + thr->catchstack_top++; + + cat->flags = DUK_CAT_TYPE_TCF; + cat->h_varname = NULL; + + if (a & DUK_BC_TRYCATCH_FLAG_HAVE_CATCH) { + cat->flags |= DUK_CAT_FLAG_CATCH_ENABLED; + } + if (a & DUK_BC_TRYCATCH_FLAG_HAVE_FINALLY) { + cat->flags |= DUK_CAT_FLAG_FINALLY_ENABLED; + } + if (a & DUK_BC_TRYCATCH_FLAG_CATCH_BINDING) { + DUK_DDD(DUK_DDDPRINT("catch binding flag set to catcher")); + cat->flags |= DUK_CAT_FLAG_CATCH_BINDING_ENABLED; + tv1 = DUK__REGP(bc); + DUK_ASSERT(DUK_TVAL_IS_STRING(tv1)); + + /* borrowed reference; although 'tv1' comes from a register, + * its value was loaded using LDCONST so the constant will + * also exist and be reachable. + */ + cat->h_varname = DUK_TVAL_GET_STRING(tv1); + } else if (a & DUK_BC_TRYCATCH_FLAG_WITH_BINDING) { + /* env created above to stack top */ + duk_hobject *new_env; + + DUK_DDD(DUK_DDDPRINT("lexenv active flag set to catcher")); + cat->flags |= DUK_CAT_FLAG_LEXENV_ACTIVE; + + DUK_DDD(DUK_DDDPRINT("activating object env: %!iT", + (duk_tval *) duk_get_tval(ctx, -1))); + new_env = DUK_GET_HOBJECT_NEGIDX(ctx, -1); + DUK_ASSERT(new_env != NULL); + + act = thr->callstack + thr->callstack_top - 1; /* relookup (side effects) */ + DUK_ASSERT(act->lex_env != NULL); + DUK_HOBJECT_SET_PROTOTYPE_UPDREF(thr, new_env, act->lex_env); /* side effects */ + + act = thr->callstack + thr->callstack_top - 1; /* relookup (side effects) */ + act->lex_env = new_env; + DUK_HOBJECT_INCREF(thr, new_env); + duk_pop(ctx); + } else { + ; + } + + /* Registers 'bc' and 'bc + 1' are written in longjmp handling + * and if their previous values (which are temporaries) become + * unreachable -and- have a finalizer, there'll be a function + * call during error handling which is not supported now (GH-287). + * Ensure that both 'bc' and 'bc + 1' have primitive values to + * guarantee no finalizer calls in error handling. Scrubbing also + * ensures finalizers for the previous values run here rather than + * later. Error handling related values are also written to 'bc' + * and 'bc + 1' but those values never become unreachable during + * error handling, so there's no side effect problem even if the + * error value has a finalizer. + */ + duk_to_undefined(ctx, bc); + duk_to_undefined(ctx, bc + 1); + + cat = thr->catchstack + thr->catchstack_top - 1; /* relookup (side effects) */ + cat->callstack_index = thr->callstack_top - 1; + cat->pc_base = (duk_instr_t *) curr_pc; /* pre-incremented, points to first jump slot */ + cat->idx_base = (duk_size_t) (thr->valstack_bottom - thr->valstack) + bc; + + DUK_DDD(DUK_DDDPRINT("TRYCATCH catcher: flags=0x%08lx, callstack_index=%ld, pc_base=%ld, " + "idx_base=%ld, h_varname=%!O", + (unsigned long) cat->flags, (long) cat->callstack_index, + (long) cat->pc_base, (long) cat->idx_base, (duk_heaphdr *) cat->h_varname)); + + curr_pc += 2; /* skip jump slots */ + break; + } + + /* Pre/post inc/dec for register variables, important for loops. */ + case DUK_OP_PREINCR: + case DUK_OP_PREDECR: + case DUK_OP_POSTINCR: + case DUK_OP_POSTDECR: { + duk_context *ctx = (duk_context *) thr; + duk_small_uint_fast_t a = DUK_DEC_A(ins); + duk_uint_fast_t bc = DUK_DEC_BC(ins); + duk_tval *tv1, *tv2; + duk_double_t x, y, z; + + /* Two lowest bits of opcode are used to distinguish + * variants. Bit 0 = inc(0)/dec(1), bit 1 = pre(0)/post(1). + */ + DUK_ASSERT((DUK_OP_PREINCR & 0x03) == 0x00); + DUK_ASSERT((DUK_OP_PREDECR & 0x03) == 0x01); + DUK_ASSERT((DUK_OP_POSTINCR & 0x03) == 0x02); + DUK_ASSERT((DUK_OP_POSTDECR & 0x03) == 0x03); + + tv1 = DUK__REGP(bc); +#if defined(DUK_USE_FASTINT) + if (DUK_TVAL_IS_FASTINT(tv1)) { + duk_int64_t x_fi, y_fi, z_fi; + x_fi = DUK_TVAL_GET_FASTINT(tv1); + if (ins & DUK_ENC_OP(0x01)) { + if (x_fi == DUK_FASTINT_MIN) { + goto skip_fastint; + } + y_fi = x_fi - 1; + } else { + if (x_fi == DUK_FASTINT_MAX) { + goto skip_fastint; + } + y_fi = x_fi + 1; + } + + DUK_TVAL_SET_FASTINT(tv1, y_fi); /* no need for refcount update */ + + tv2 = DUK__REGP(a); + z_fi = (ins & DUK_ENC_OP(0x02)) ? x_fi : y_fi; + DUK_TVAL_SET_FASTINT_UPDREF(thr, tv2, z_fi); /* side effects */ + break; + } + skip_fastint: +#endif + if (DUK_TVAL_IS_NUMBER(tv1)) { + /* Fast path for the case where the register + * is a number (e.g. loop counter). + */ + + x = DUK_TVAL_GET_NUMBER(tv1); + if (ins & DUK_ENC_OP(0x01)) { + y = x - 1.0; + } else { + y = x + 1.0; + } + + DUK_TVAL_SET_NUMBER(tv1, y); /* no need for refcount update */ + } else { + x = duk_to_number(ctx, bc); + + if (ins & DUK_ENC_OP(0x01)) { + y = x - 1.0; + } else { + y = x + 1.0; + } + + duk_push_number(ctx, y); + duk_replace(ctx, bc); + } + + tv2 = DUK__REGP(a); + z = (ins & DUK_ENC_OP(0x02)) ? x : y; + DUK_TVAL_SET_NUMBER_UPDREF(thr, tv2, z); /* side effects */ + break; + } + + /* Preinc/predec for var-by-name, slow path. */ + case DUK_OP_PREINCV: + case DUK_OP_PREDECV: + case DUK_OP_POSTINCV: + case DUK_OP_POSTDECV: { + duk_context *ctx = (duk_context *) thr; + duk_activation *act; + duk_small_uint_fast_t a = DUK_DEC_A(ins); + duk_uint_fast_t bc = DUK_DEC_BC(ins); + duk_double_t x, y; + duk_tval *tv1; + duk_hstring *name; + + /* Two lowest bits of opcode are used to distinguish + * variants. Bit 0 = inc(0)/dec(1), bit 1 = pre(0)/post(1). + */ + DUK_ASSERT((DUK_OP_PREINCV & 0x03) == 0x00); + DUK_ASSERT((DUK_OP_PREDECV & 0x03) == 0x01); + DUK_ASSERT((DUK_OP_POSTINCV & 0x03) == 0x02); + DUK_ASSERT((DUK_OP_POSTDECV & 0x03) == 0x03); + + tv1 = DUK__CONSTP(bc); + DUK_ASSERT(DUK_TVAL_IS_STRING(tv1)); + name = DUK_TVAL_GET_STRING(tv1); + DUK_ASSERT(name != NULL); + act = thr->callstack + thr->callstack_top - 1; + (void) duk_js_getvar_activation(thr, act, name, 1 /*throw*/); /* -> [... val this] */ + + /* XXX: fastint fast path would be very useful here */ + + x = duk_to_number(ctx, -2); + duk_pop_2(ctx); + if (ins & DUK_ENC_OP(0x01)) { + y = x - 1.0; + } else { + y = x + 1.0; + } + + duk_push_number(ctx, y); + tv1 = DUK_GET_TVAL_NEGIDX(ctx, -1); + DUK_ASSERT(tv1 != NULL); + act = thr->callstack + thr->callstack_top - 1; + duk_js_putvar_activation(thr, act, name, tv1, DUK__STRICT()); + duk_pop(ctx); + + duk_push_number(ctx, (ins & DUK_ENC_OP(0x02)) ? x : y); + duk_replace(ctx, (duk_idx_t) a); + break; + } + + /* Preinc/predec for object properties. */ + case DUK_OP_PREINCP: + case DUK_OP_PREDECP: + case DUK_OP_POSTINCP: + case DUK_OP_POSTDECP: { + duk_context *ctx = (duk_context *) thr; + duk_small_uint_fast_t a = DUK_DEC_A(ins); + duk_small_uint_fast_t b = DUK_DEC_B(ins); + duk_small_uint_fast_t c = DUK_DEC_C(ins); + duk_tval *tv_obj; + duk_tval *tv_key; + duk_tval *tv_val; + duk_bool_t rc; + duk_double_t x, y; + + /* A -> target reg + * B -> object reg/const (may be const e.g. in "'foo'[1]") + * C -> key reg/const + */ + + /* Two lowest bits of opcode are used to distinguish + * variants. Bit 0 = inc(0)/dec(1), bit 1 = pre(0)/post(1). + */ + DUK_ASSERT((DUK_OP_PREINCP & 0x03) == 0x00); + DUK_ASSERT((DUK_OP_PREDECP & 0x03) == 0x01); + DUK_ASSERT((DUK_OP_POSTINCP & 0x03) == 0x02); + DUK_ASSERT((DUK_OP_POSTDECP & 0x03) == 0x03); + + tv_obj = DUK__REGCONSTP(b); + tv_key = DUK__REGCONSTP(c); + rc = duk_hobject_getprop(thr, tv_obj, tv_key); /* -> [val] */ + DUK_UNREF(rc); /* ignore */ + tv_obj = NULL; /* invalidated */ + tv_key = NULL; /* invalidated */ + + x = duk_to_number(ctx, -1); + duk_pop(ctx); + if (ins & DUK_ENC_OP(0x01)) { + y = x - 1.0; + } else { + y = x + 1.0; + } + + duk_push_number(ctx, y); + tv_val = DUK_GET_TVAL_NEGIDX(ctx, -1); + DUK_ASSERT(tv_val != NULL); + tv_obj = DUK__REGCONSTP(b); + tv_key = DUK__REGCONSTP(c); + rc = duk_hobject_putprop(thr, tv_obj, tv_key, tv_val, DUK__STRICT()); + DUK_UNREF(rc); /* ignore */ + tv_obj = NULL; /* invalidated */ + tv_key = NULL; /* invalidated */ + duk_pop(ctx); + + duk_push_number(ctx, (ins & DUK_ENC_OP(0x02)) ? x : y); + duk_replace(ctx, (duk_idx_t) a); + break; + } + + case DUK_OP_EXTRA: { + /* XXX: shared decoding of 'b' and 'c'? */ + + duk_small_uint_fast_t extraop = DUK_DEC_A(ins); + switch ((int) extraop) { + /* XXX: switch cast? */ + + case DUK_EXTRAOP_NOP: { + /* nop */ + break; + } + + case DUK_EXTRAOP_INVALID: { + DUK_ERROR_FMT1(thr, DUK_ERR_INTERNAL_ERROR, "INVALID opcode (%ld)", (long) DUK_DEC_BC(ins)); + break; + } + + case DUK_EXTRAOP_LDTHIS: { + /* Note: 'this' may be bound to any value, not just an object */ + duk_uint_fast_t bc = DUK_DEC_BC(ins); + duk_tval *tv1, *tv2; + + tv1 = DUK__REGP(bc); + tv2 = thr->valstack_bottom - 1; /* 'this binding' is just under bottom */ + DUK_ASSERT(tv2 >= thr->valstack); + + DUK_DDD(DUK_DDDPRINT("LDTHIS: %!T to r%ld", (duk_tval *) tv2, (long) bc)); + + DUK_TVAL_SET_TVAL_UPDREF_FAST(thr, tv1, tv2); /* side effects */ + break; + } + + case DUK_EXTRAOP_LDUNDEF: { + duk_uint_fast_t bc = DUK_DEC_BC(ins); + duk_tval *tv1; + + tv1 = DUK__REGP(bc); + DUK_TVAL_SET_UNDEFINED_UPDREF(thr, tv1); /* side effects */ + break; + } + + case DUK_EXTRAOP_LDNULL: { + duk_uint_fast_t bc = DUK_DEC_BC(ins); + duk_tval *tv1; + + tv1 = DUK__REGP(bc); + DUK_TVAL_SET_NULL_UPDREF(thr, tv1); /* side effects */ + break; + } + + case DUK_EXTRAOP_LDTRUE: + case DUK_EXTRAOP_LDFALSE: { + duk_uint_fast_t bc = DUK_DEC_BC(ins); + duk_tval *tv1; + duk_small_uint_fast_t bval = (extraop == DUK_EXTRAOP_LDTRUE ? 1 : 0); + + tv1 = DUK__REGP(bc); + DUK_TVAL_SET_BOOLEAN_UPDREF(thr, tv1, bval); /* side effects */ + break; + } + + case DUK_EXTRAOP_NEWOBJ: { + duk_context *ctx = (duk_context *) thr; + duk_small_uint_fast_t b = DUK_DEC_B(ins); + + duk_push_object(ctx); + duk_replace(ctx, (duk_idx_t) b); + break; + } + + case DUK_EXTRAOP_NEWARR: { + duk_context *ctx = (duk_context *) thr; + duk_small_uint_fast_t b = DUK_DEC_B(ins); + + duk_push_array(ctx); + duk_replace(ctx, (duk_idx_t) b); + break; + } + + case DUK_EXTRAOP_SETALEN: { + duk_small_uint_fast_t b; + duk_small_uint_fast_t c; + duk_tval *tv1; + duk_hobject *h; + duk_uint32_t len; + + b = DUK_DEC_B(ins); tv1 = DUK__REGP(b); + DUK_ASSERT(DUK_TVAL_IS_OBJECT(tv1)); + h = DUK_TVAL_GET_OBJECT(tv1); + + c = DUK_DEC_C(ins); tv1 = DUK__REGP(c); + DUK_ASSERT(DUK_TVAL_IS_NUMBER(tv1)); + len = (duk_uint32_t) DUK_TVAL_GET_NUMBER(tv1); + + duk_hobject_set_length(thr, h, len); + + break; + } + + case DUK_EXTRAOP_TYPEOF: { + duk_context *ctx = (duk_context *) thr; + duk_uint_fast_t bc = DUK_DEC_BC(ins); + duk_push_hstring(ctx, duk_js_typeof(thr, DUK__REGP(bc))); + duk_replace(ctx, (duk_idx_t) bc); + break; + } + + case DUK_EXTRAOP_TYPEOFID: { + duk_context *ctx = (duk_context *) thr; + duk_activation *act; + duk_small_uint_fast_t b = DUK_DEC_B(ins); + duk_small_uint_fast_t c = DUK_DEC_C(ins); + duk_hstring *name; + duk_tval *tv; + + /* B -> target register + * C -> constant index of identifier name + */ + + tv = DUK__REGCONSTP(c); /* XXX: this could be a DUK__CONSTP instead */ + DUK_ASSERT(DUK_TVAL_IS_STRING(tv)); + name = DUK_TVAL_GET_STRING(tv); + act = thr->callstack + thr->callstack_top - 1; + if (duk_js_getvar_activation(thr, act, name, 0 /*throw*/)) { + /* -> [... val this] */ + tv = DUK_GET_TVAL_NEGIDX(ctx, -2); + duk_push_hstring(ctx, duk_js_typeof(thr, tv)); + duk_replace(ctx, (duk_idx_t) b); + duk_pop_2(ctx); + } else { + /* unresolvable, no stack changes */ + duk_push_hstring_stridx(ctx, DUK_STRIDX_LC_UNDEFINED); + duk_replace(ctx, (duk_idx_t) b); + } + + break; + } + + case DUK_EXTRAOP_INITENUM: { + duk_context *ctx = (duk_context *) thr; + duk_small_uint_fast_t b = DUK_DEC_B(ins); + duk_small_uint_fast_t c = DUK_DEC_C(ins); + + /* + * Enumeration semantics come from for-in statement, E5 Section 12.6.4. + * If called with 'null' or 'undefined', this opcode returns 'null' as + * the enumerator, which is special cased in NEXTENUM. This simplifies + * the compiler part + */ + + /* B -> register for writing enumerator object + * C -> value to be enumerated (register) + */ + + if (duk_is_null_or_undefined(ctx, (duk_idx_t) c)) { + duk_push_null(ctx); + duk_replace(ctx, (duk_idx_t) b); + } else { + duk_dup(ctx, (duk_idx_t) c); + duk_to_object(ctx, -1); + duk_hobject_enumerator_create(ctx, 0 /*enum_flags*/); /* [ ... val ] --> [ ... enum ] */ + duk_replace(ctx, (duk_idx_t) b); + } + break; + } + + case DUK_EXTRAOP_NEXTENUM: { + duk_context *ctx = (duk_context *) thr; + duk_small_uint_fast_t b = DUK_DEC_B(ins); + duk_small_uint_fast_t c = DUK_DEC_C(ins); + + /* + * NEXTENUM checks whether the enumerator still has unenumerated + * keys. If so, the next key is loaded to the target register + * and the next instruction is skipped. Otherwise the next instruction + * will be executed, jumping out of the enumeration loop. + */ + + /* B -> target register for next key + * C -> enum register + */ + + DUK_DDD(DUK_DDDPRINT("NEXTENUM: b->%!T, c->%!T", + (duk_tval *) duk_get_tval(ctx, (duk_idx_t) b), + (duk_tval *) duk_get_tval(ctx, (duk_idx_t) c))); + + if (duk_is_object(ctx, (duk_idx_t) c)) { + /* XXX: assert 'c' is an enumerator */ + duk_dup(ctx, (duk_idx_t) c); + if (duk_hobject_enumerator_next(ctx, 0 /*get_value*/)) { + /* [ ... enum ] -> [ ... next_key ] */ + DUK_DDD(DUK_DDDPRINT("enum active, next key is %!T, skip jump slot ", + (duk_tval *) duk_get_tval(ctx, -1))); + curr_pc++; + } else { + /* [ ... enum ] -> [ ... ] */ + DUK_DDD(DUK_DDDPRINT("enum finished, execute jump slot")); + duk_push_undefined(ctx); + } + duk_replace(ctx, (duk_idx_t) b); + } else { + /* 'null' enumerator case -> behave as with an empty enumerator */ + DUK_ASSERT(duk_is_null(ctx, (duk_idx_t) c)); + DUK_DDD(DUK_DDDPRINT("enum is null, execute jump slot")); + } + break; + } + + case DUK_EXTRAOP_INITSET: + case DUK_EXTRAOP_INITSETI: + case DUK_EXTRAOP_INITGET: + case DUK_EXTRAOP_INITGETI: { + duk_context *ctx = (duk_context *) thr; + duk_bool_t is_set = (extraop == DUK_EXTRAOP_INITSET || extraop == DUK_EXTRAOP_INITSETI); + duk_small_uint_fast_t b = DUK_DEC_B(ins); + duk_uint_fast_t idx; + + /* B -> object register + * C -> C+0 contains key, C+1 closure (value) + */ + + /* + * INITSET/INITGET are only used to initialize object literal keys. + * The compiler ensures that there cannot be a previous data property + * of the same name. It also ensures that setter and getter can only + * be initialized once (or not at all). + */ + + idx = (duk_uint_fast_t) DUK_DEC_C(ins); + if (extraop == DUK_EXTRAOP_INITSETI || extraop == DUK_EXTRAOP_INITGETI) { + duk_tval *tv_ind = DUK__REGP(idx); + DUK_ASSERT(DUK_TVAL_IS_NUMBER(tv_ind)); + idx = (duk_uint_fast_t) DUK_TVAL_GET_NUMBER(tv_ind); + } + +#if defined(DUK_USE_EXEC_INDIRECT_BOUND_CHECK) + if (idx + 2 > (duk_uint_fast_t) duk_get_top(ctx)) { + /* XXX: use duk_is_valid_index() instead? */ + /* XXX: improve check; check against nregs, not against top */ + DUK__INTERNAL_ERROR("INITSET/INITGET out of bounds"); + } +#endif + + /* XXX: this is now a very unoptimal implementation -- this can be + * made very simple by direct manipulation of the object internals, + * given the guarantees above. + */ + + duk_push_hobject_bidx(ctx, DUK_BIDX_OBJECT_CONSTRUCTOR); + duk_get_prop_stridx(ctx, -1, DUK_STRIDX_DEFINE_PROPERTY); + duk_push_undefined(ctx); + duk_dup(ctx, (duk_idx_t) b); + duk_dup(ctx, (duk_idx_t) (idx + 0)); + duk_push_object(ctx); /* -> [ Object defineProperty undefined obj key desc ] */ + + duk_push_true(ctx); + duk_put_prop_stridx(ctx, -2, DUK_STRIDX_ENUMERABLE); + duk_push_true(ctx); + duk_put_prop_stridx(ctx, -2, DUK_STRIDX_CONFIGURABLE); + duk_dup(ctx, (duk_idx_t) (idx + 1)); + duk_put_prop_stridx(ctx, -2, (is_set ? DUK_STRIDX_SET : DUK_STRIDX_GET)); + + DUK_DDD(DUK_DDDPRINT("INITGET/INITSET: obj=%!T, key=%!T, desc=%!T", + (duk_tval *) duk_get_tval(ctx, -3), + (duk_tval *) duk_get_tval(ctx, -2), + (duk_tval *) duk_get_tval(ctx, -1))); + + duk_call_method(ctx, 3); /* -> [ Object res ] */ + duk_pop_2(ctx); + + DUK_DDD(DUK_DDDPRINT("INITGET/INITSET AFTER: obj=%!T", + (duk_tval *) duk_get_tval(ctx, (duk_idx_t) b))); + break; + } + + case DUK_EXTRAOP_ENDTRY: { + duk_catcher *cat; + duk_tval *tv1; + + DUK_ASSERT(thr->catchstack_top >= 1); + DUK_ASSERT(thr->callstack_top >= 1); + DUK_ASSERT(thr->catchstack[thr->catchstack_top - 1].callstack_index == thr->callstack_top - 1); + + cat = thr->catchstack + thr->catchstack_top - 1; + + DUK_DDD(DUK_DDDPRINT("ENDTRY: clearing catch active flag (regardless of whether it was set or not)")); + DUK_CAT_CLEAR_CATCH_ENABLED(cat); + + if (DUK_CAT_HAS_FINALLY_ENABLED(cat)) { + DUK_DDD(DUK_DDDPRINT("ENDTRY: finally part is active, jump through 2nd jump slot with 'normal continuation'")); + + tv1 = thr->valstack + cat->idx_base; + DUK_ASSERT(tv1 >= thr->valstack && tv1 < thr->valstack_top); + DUK_TVAL_SET_UNDEFINED_UPDREF(thr, tv1); /* side effects */ + tv1 = NULL; + + tv1 = thr->valstack + cat->idx_base + 1; + DUK_ASSERT(tv1 >= thr->valstack && tv1 < thr->valstack_top); + DUK_TVAL_SET_FASTINT_U32_UPDREF(thr, tv1, (duk_uint32_t) DUK_LJ_TYPE_NORMAL); /* side effects */ + tv1 = NULL; + + DUK_CAT_CLEAR_FINALLY_ENABLED(cat); + } else { + DUK_DDD(DUK_DDDPRINT("ENDTRY: no finally part, dismantle catcher, jump through 2nd jump slot (to end of statement)")); + duk_hthread_catchstack_unwind(thr, thr->catchstack_top - 1); + /* no need to unwind callstack */ + } + + curr_pc = cat->pc_base + 1; + break; + } + + case DUK_EXTRAOP_ENDCATCH: { + duk_activation *act; + duk_catcher *cat; + duk_tval *tv1; + + DUK_ASSERT(thr->catchstack_top >= 1); + DUK_ASSERT(thr->callstack_top >= 1); + DUK_ASSERT(thr->catchstack[thr->catchstack_top - 1].callstack_index == thr->callstack_top - 1); + + cat = thr->catchstack + thr->catchstack_top - 1; + DUK_ASSERT(!DUK_CAT_HAS_CATCH_ENABLED(cat)); /* cleared before entering catch part */ + + act = thr->callstack + thr->callstack_top - 1; + + if (DUK_CAT_HAS_LEXENV_ACTIVE(cat)) { + duk_hobject *prev_env; + + /* 'with' binding has no catch clause, so can't be here unless a normal try-catch */ + DUK_ASSERT(DUK_CAT_HAS_CATCH_BINDING_ENABLED(cat)); + DUK_ASSERT(act->lex_env != NULL); + + DUK_DDD(DUK_DDDPRINT("ENDCATCH: popping catcher part lexical environment")); + + prev_env = act->lex_env; + DUK_ASSERT(prev_env != NULL); + act->lex_env = DUK_HOBJECT_GET_PROTOTYPE(thr->heap, prev_env); + DUK_CAT_CLEAR_LEXENV_ACTIVE(cat); + DUK_HOBJECT_DECREF(thr, prev_env); /* side effects */ + } + + if (DUK_CAT_HAS_FINALLY_ENABLED(cat)) { + DUK_DDD(DUK_DDDPRINT("ENDCATCH: finally part is active, jump through 2nd jump slot with 'normal continuation'")); + + tv1 = thr->valstack + cat->idx_base; + DUK_ASSERT(tv1 >= thr->valstack && tv1 < thr->valstack_top); + DUK_TVAL_SET_UNDEFINED_UPDREF(thr, tv1); /* side effects */ + tv1 = NULL; + + tv1 = thr->valstack + cat->idx_base + 1; + DUK_ASSERT(tv1 >= thr->valstack && tv1 < thr->valstack_top); + DUK_TVAL_SET_FASTINT_U32_UPDREF(thr, tv1, (duk_uint32_t) DUK_LJ_TYPE_NORMAL); /* side effects */ + tv1 = NULL; + + DUK_CAT_CLEAR_FINALLY_ENABLED(cat); + } else { + DUK_DDD(DUK_DDDPRINT("ENDCATCH: no finally part, dismantle catcher, jump through 2nd jump slot (to end of statement)")); + duk_hthread_catchstack_unwind(thr, thr->catchstack_top - 1); + /* no need to unwind callstack */ + } + + curr_pc = cat->pc_base + 1; + break; + } + + case DUK_EXTRAOP_ENDFIN: { + duk_context *ctx = (duk_context *) thr; + duk_catcher *cat; + duk_tval *tv1; + duk_small_uint_t cont_type; + duk_small_uint_t ret_result; + + /* Sync and NULL early. */ + DUK__SYNC_AND_NULL_CURR_PC(); + + DUK_ASSERT(thr->catchstack_top >= 1); + DUK_ASSERT(thr->callstack_top >= 1); + DUK_ASSERT(thr->catchstack[thr->catchstack_top - 1].callstack_index == thr->callstack_top - 1); + + cat = thr->catchstack + thr->catchstack_top - 1; + + /* CATCH flag may be enabled or disabled here; it may be enabled if + * the statement has a catch block but the try block does not throw + * an error. + */ + DUK_ASSERT(!DUK_CAT_HAS_FINALLY_ENABLED(cat)); /* cleared before entering finally */ + /* XXX: assert idx_base */ + + DUK_DDD(DUK_DDDPRINT("ENDFIN: completion value=%!T, type=%!T", + (duk_tval *) (thr->valstack + cat->idx_base + 0), + (duk_tval *) (thr->valstack + cat->idx_base + 1))); + + tv1 = thr->valstack + cat->idx_base + 1; /* type */ + DUK_ASSERT(DUK_TVAL_IS_NUMBER(tv1)); + cont_type = (duk_small_uint_t) DUK_TVAL_GET_NUMBER(tv1); + + switch (cont_type) { + case DUK_LJ_TYPE_NORMAL: { + DUK_DDD(DUK_DDDPRINT("ENDFIN: finally part finishing with 'normal' (non-abrupt) completion -> " + "dismantle catcher, resume execution after ENDFIN")); + duk_hthread_catchstack_unwind(thr, thr->catchstack_top - 1); + /* no need to unwind callstack */ + goto restart_execution; + } + case DUK_LJ_TYPE_RETURN: { + DUK_DDD(DUK_DDDPRINT("ENDFIN: finally part finishing with 'return' complation -> dismantle " + "catcher, handle return, lj.value1=%!T", thr->valstack + cat->idx_base)); + + /* Not necessary to unwind catchstack: return handling will + * do it. The finally flag of 'cat' is no longer set. The + * catch flag may be set, but it's not checked by return handling. + */ + DUK_ASSERT(!DUK_CAT_HAS_FINALLY_ENABLED(cat)); /* cleared before entering finally */ +#if 0 + duk_hthread_catchstack_unwind(thr, thr->catchstack_top - 1); +#endif + + duk_push_tval(ctx, thr->valstack + cat->idx_base); + ret_result = duk__handle_return(thr, + entry_thread, + entry_callstack_top); + if (ret_result == DUK__RETHAND_RESTART) { + goto restart_execution; + } + DUK_ASSERT(ret_result == DUK__RETHAND_FINISHED); + + DUK_DDD(DUK_DDDPRINT("exiting executor after ENDFIN and RETURN (pseudo) longjmp type")); + return; + } + case DUK_LJ_TYPE_BREAK: + case DUK_LJ_TYPE_CONTINUE: { + duk_uint_t label_id; + duk_small_uint_t lj_type; + + /* Not necessary to unwind catchstack: break/continue + * handling will do it. The finally flag of 'cat' is + * no longer set. The catch flag may be set, but it's + * not checked by break/continue handling. + */ +#if 0 + duk_hthread_catchstack_unwind(thr, thr->catchstack_top - 1); +#endif + + tv1 = thr->valstack + cat->idx_base; + DUK_ASSERT(DUK_TVAL_IS_NUMBER(tv1)); +#if defined(DUK_USE_FASTINT) + DUK_ASSERT(DUK_TVAL_IS_FASTINT(tv1)); + label_id = (duk_small_uint_t) DUK_TVAL_GET_FASTINT_U32(tv1); +#else + label_id = (duk_small_uint_t) DUK_TVAL_GET_NUMBER(tv1); +#endif + lj_type = cont_type; + duk__handle_break_or_continue(thr, label_id, lj_type); + goto restart_execution; + } + default: { + DUK_DDD(DUK_DDDPRINT("ENDFIN: finally part finishing with abrupt completion, lj_type=%ld -> " + "dismantle catcher, re-throw error", + (long) cont_type)); + + duk_push_tval(ctx, thr->valstack + cat->idx_base); + + duk_err_setup_heap_ljstate(thr, (duk_small_int_t) cont_type); + + DUK_ASSERT(thr->heap->lj.jmpbuf_ptr != NULL); /* always in executor */ + duk_err_longjmp(thr); + DUK_UNREACHABLE(); + } + } + + /* Must restart in all cases because we NULLed thr->ptr_curr_pc. */ + DUK_UNREACHABLE(); + break; + } + + case DUK_EXTRAOP_THROW: { + duk_context *ctx = (duk_context *) thr; + duk_uint_fast_t bc = DUK_DEC_BC(ins); + + /* Note: errors are augmented when they are created, not + * when they are thrown. So, don't augment here, it would + * break re-throwing for instance. + */ + + /* Sync so that augmentation sees up-to-date activations, NULL + * thr->ptr_curr_pc so that it's not used if side effects occur + * in augmentation or longjmp handling. + */ + DUK__SYNC_AND_NULL_CURR_PC(); + + duk_dup(ctx, (duk_idx_t) bc); + DUK_DDD(DUK_DDDPRINT("THROW ERROR (BYTECODE): %!dT (before throw augment)", + (duk_tval *) duk_get_tval(ctx, -1))); +#if defined(DUK_USE_AUGMENT_ERROR_THROW) + duk_err_augment_error_throw(thr); + DUK_DDD(DUK_DDDPRINT("THROW ERROR (BYTECODE): %!dT (after throw augment)", + (duk_tval *) duk_get_tval(ctx, -1))); +#endif + + duk_err_setup_heap_ljstate(thr, DUK_LJ_TYPE_THROW); + + DUK_ASSERT(thr->heap->lj.jmpbuf_ptr != NULL); /* always in executor */ + duk_err_longjmp(thr); + DUK_UNREACHABLE(); + break; + } + + case DUK_EXTRAOP_INVLHS: { + DUK_ERROR(thr, DUK_ERR_REFERENCE_ERROR, "invalid lvalue"); + + DUK_UNREACHABLE(); + break; + } + + case DUK_EXTRAOP_UNM: + case DUK_EXTRAOP_UNP: { + duk_uint_fast_t bc = DUK_DEC_BC(ins); + duk__vm_arith_unary_op(thr, DUK__REGP(bc), bc, extraop); + break; + } + + case DUK_EXTRAOP_DEBUGGER: { + /* Opcode only emitted by compiler when debugger + * support is enabled. Ignore it silently without + * debugger support, in case it has been loaded + * from precompiled bytecode. + */ +#if defined(DUK_USE_DEBUGGER_SUPPORT) + if (DUK_HEAP_IS_DEBUGGER_ATTACHED(thr->heap)) { + DUK_D(DUK_DPRINT("DEBUGGER statement encountered, halt execution")); + DUK__SYNC_AND_NULL_CURR_PC(); + duk_debug_halt_execution(thr, 1 /*use_prev_pc*/); + DUK_D(DUK_DPRINT("DEBUGGER statement finished, resume execution")); + goto restart_execution; + } else { + DUK_D(DUK_DPRINT("DEBUGGER statement ignored, debugger not attached")); + } +#else + DUK_D(DUK_DPRINT("DEBUGGER statement ignored, no debugger support")); +#endif + break; + } + + case DUK_EXTRAOP_BREAK: { + duk_uint_fast_t bc = DUK_DEC_BC(ins); + + DUK_DDD(DUK_DDDPRINT("BREAK: %ld", (long) bc)); + + DUK__SYNC_AND_NULL_CURR_PC(); + duk__handle_break_or_continue(thr, (duk_uint_t) bc, DUK_LJ_TYPE_BREAK); + goto restart_execution; + } + + case DUK_EXTRAOP_CONTINUE: { + duk_uint_fast_t bc = DUK_DEC_BC(ins); + + DUK_DDD(DUK_DDDPRINT("CONTINUE: %ld", (long) bc)); + + DUK__SYNC_AND_NULL_CURR_PC(); + duk__handle_break_or_continue(thr, (duk_uint_t) bc, DUK_LJ_TYPE_CONTINUE); + goto restart_execution; + } + + case DUK_EXTRAOP_BNOT: { + duk_uint_fast_t bc = DUK_DEC_BC(ins); + + duk__vm_bitwise_not(thr, DUK__REGP(bc), bc); + break; + } + + case DUK_EXTRAOP_LNOT: { + duk_uint_fast_t bc = DUK_DEC_BC(ins); + duk_tval *tv1; + + tv1 = DUK__REGP(bc); + duk__vm_logical_not(thr, tv1, tv1); + break; + } + + case DUK_EXTRAOP_INSTOF: { + duk_context *ctx = (duk_context *) thr; + duk_small_uint_fast_t b = DUK_DEC_B(ins); + duk_small_uint_fast_t c = DUK_DEC_C(ins); + duk_bool_t tmp; + + tmp = duk_js_instanceof(thr, DUK__REGP(b), DUK__REGCONSTP(c)); + duk_push_boolean(ctx, tmp); + duk_replace(ctx, (duk_idx_t) b); + break; + } + + case DUK_EXTRAOP_IN: { + duk_context *ctx = (duk_context *) thr; + duk_small_uint_fast_t b = DUK_DEC_B(ins); + duk_small_uint_fast_t c = DUK_DEC_C(ins); + duk_bool_t tmp; + + tmp = duk_js_in(thr, DUK__REGP(b), DUK__REGCONSTP(c)); + duk_push_boolean(ctx, tmp); + duk_replace(ctx, (duk_idx_t) b); + break; + } + + case DUK_EXTRAOP_LABEL: { + duk_catcher *cat; + duk_uint_fast_t bc = DUK_DEC_BC(ins); + + /* allocate catcher and populate it (should be atomic) */ + + duk_hthread_catchstack_grow(thr); + cat = thr->catchstack + thr->catchstack_top; + thr->catchstack_top++; + + cat->flags = DUK_CAT_TYPE_LABEL | (bc << DUK_CAT_LABEL_SHIFT); + cat->callstack_index = thr->callstack_top - 1; + cat->pc_base = (duk_instr_t *) curr_pc; /* pre-incremented, points to first jump slot */ + cat->idx_base = 0; /* unused for label */ + cat->h_varname = NULL; + + DUK_DDD(DUK_DDDPRINT("LABEL catcher: flags=0x%08lx, callstack_index=%ld, pc_base=%ld, " + "idx_base=%ld, h_varname=%!O, label_id=%ld", + (long) cat->flags, (long) cat->callstack_index, (long) cat->pc_base, + (long) cat->idx_base, (duk_heaphdr *) cat->h_varname, (long) DUK_CAT_GET_LABEL(cat))); + + curr_pc += 2; /* skip jump slots */ + break; + } + + case DUK_EXTRAOP_ENDLABEL: { + duk_catcher *cat; +#if defined(DUK_USE_DDDPRINT) || defined(DUK_USE_ASSERTIONS) + duk_uint_fast_t bc = DUK_DEC_BC(ins); +#endif +#if defined(DUK_USE_DDDPRINT) + DUK_DDD(DUK_DDDPRINT("ENDLABEL %ld", (long) bc)); +#endif + + DUK_ASSERT(thr->catchstack_top >= 1); + + cat = thr->catchstack + thr->catchstack_top - 1; + DUK_UNREF(cat); + DUK_ASSERT(DUK_CAT_GET_TYPE(cat) == DUK_CAT_TYPE_LABEL); + DUK_ASSERT((duk_uint_fast_t) DUK_CAT_GET_LABEL(cat) == bc); + + duk_hthread_catchstack_unwind(thr, thr->catchstack_top - 1); + /* no need to unwind callstack */ + break; + } + + default: { + DUK__INTERNAL_ERROR("invalid extra opcode"); + } + + } /* end switch */ + + break; + } + + default: { + /* this should never be possible, because the switch-case is + * comprehensive + */ + DUK__INTERNAL_ERROR("invalid opcode"); + break; + } + + } /* end switch */ + } + DUK_UNREACHABLE(); + +#ifndef DUK_USE_VERBOSE_EXECUTOR_ERRORS + internal_error: + DUK_ERROR_INTERNAL(thr, "internal error in bytecode executor"); +#endif +} + +#undef DUK__LONGJMP_RESTART +#undef DUK__LONGJMP_FINISHED +#undef DUK__LONGJMP_RETHROW + +#undef DUK__RETHAND_RESTART +#undef DUK__RETHAND_FINISHED + +#undef DUK__FUN +#undef DUK__STRICT +#undef DUK__REG +#undef DUK__REGP +#undef DUK__CONST +#undef DUK__CONSTP +#undef DUK__RCISREG +#undef DUK__REGCONST +#undef DUK__REGCONSTP + +#undef DUK__INTERNAL_ERROR +#undef DUK__SYNC_CURR_PC +#undef DUK__SYNC_AND_NULL_CURR_PC |