diff options
Diffstat (limited to 'src/civetweb/src/third_party/duktape-1.5.2/src-separate/duk_hcompiledfunction.h')
| -rw-r--r-- | src/civetweb/src/third_party/duktape-1.5.2/src-separate/duk_hcompiledfunction.h | 239 |
1 files changed, 239 insertions, 0 deletions
diff --git a/src/civetweb/src/third_party/duktape-1.5.2/src-separate/duk_hcompiledfunction.h b/src/civetweb/src/third_party/duktape-1.5.2/src-separate/duk_hcompiledfunction.h new file mode 100644 index 000000000..04b9ea1e7 --- /dev/null +++ b/src/civetweb/src/third_party/duktape-1.5.2/src-separate/duk_hcompiledfunction.h @@ -0,0 +1,239 @@ +/* + * Heap compiled function (Ecmascript function) representation. + * + * There is a single data buffer containing the Ecmascript function's + * bytecode, constants, and inner functions. + */ + +#ifndef DUK_HCOMPILEDFUNCTION_H_INCLUDED +#define DUK_HCOMPILEDFUNCTION_H_INCLUDED + +/* + * Field accessor macros + */ + +/* XXX: casts could be improved, especially for GET/SET DATA */ + +#if defined(DUK_USE_HEAPPTR16) +#define DUK_HCOMPILEDFUNCTION_GET_DATA(heap,h) \ + ((duk_hbuffer_fixed *) (void *) DUK_USE_HEAPPTR_DEC16((heap)->heap_udata, (h)->data16)) +#define DUK_HCOMPILEDFUNCTION_SET_DATA(heap,h,v) do { \ + (h)->data16 = DUK_USE_HEAPPTR_ENC16((heap)->heap_udata, (void *) (v)); \ + } while (0) +#define DUK_HCOMPILEDFUNCTION_GET_FUNCS(heap,h) \ + ((duk_hobject **) (void *) (DUK_USE_HEAPPTR_DEC16((heap)->heap_udata, (h)->funcs16))) +#define DUK_HCOMPILEDFUNCTION_SET_FUNCS(heap,h,v) do { \ + (h)->funcs16 = DUK_USE_HEAPPTR_ENC16((heap)->heap_udata, (void *) (v)); \ + } while (0) +#define DUK_HCOMPILEDFUNCTION_GET_BYTECODE(heap,h) \ + ((duk_instr_t *) (void *) (DUK_USE_HEAPPTR_DEC16((heap)->heap_udata, (h)->bytecode16))) +#define DUK_HCOMPILEDFUNCTION_SET_BYTECODE(heap,h,v) do { \ + (h)->bytecode16 = DUK_USE_HEAPPTR_ENC16((heap)->heap_udata, (void *) (v)); \ + } while (0) +#else +#define DUK_HCOMPILEDFUNCTION_GET_DATA(heap,h) \ + ((duk_hbuffer_fixed *) (void *) (h)->data) +#define DUK_HCOMPILEDFUNCTION_SET_DATA(heap,h,v) do { \ + (h)->data = (duk_hbuffer *) (v); \ + } while (0) +#define DUK_HCOMPILEDFUNCTION_GET_FUNCS(heap,h) \ + ((h)->funcs) +#define DUK_HCOMPILEDFUNCTION_SET_FUNCS(heap,h,v) do { \ + (h)->funcs = (v); \ + } while (0) +#define DUK_HCOMPILEDFUNCTION_GET_BYTECODE(heap,h) \ + ((h)->bytecode) +#define DUK_HCOMPILEDFUNCTION_SET_BYTECODE(heap,h,v) do { \ + (h)->bytecode = (v); \ + } while (0) +#endif + +/* + * Accessor macros for function specific data areas + */ + +/* Note: assumes 'data' is always a fixed buffer */ +#define DUK_HCOMPILEDFUNCTION_GET_BUFFER_BASE(heap,h) \ + DUK_HBUFFER_FIXED_GET_DATA_PTR((heap), DUK_HCOMPILEDFUNCTION_GET_DATA((heap), (h))) + +#define DUK_HCOMPILEDFUNCTION_GET_CONSTS_BASE(heap,h) \ + ((duk_tval *) (void *) DUK_HCOMPILEDFUNCTION_GET_BUFFER_BASE((heap), (h))) + +#define DUK_HCOMPILEDFUNCTION_GET_FUNCS_BASE(heap,h) \ + DUK_HCOMPILEDFUNCTION_GET_FUNCS((heap), (h)) + +#define DUK_HCOMPILEDFUNCTION_GET_CODE_BASE(heap,h) \ + DUK_HCOMPILEDFUNCTION_GET_BYTECODE((heap), (h)) + +#define DUK_HCOMPILEDFUNCTION_GET_CONSTS_END(heap,h) \ + ((duk_tval *) (void *) DUK_HCOMPILEDFUNCTION_GET_FUNCS((heap), (h))) + +#define DUK_HCOMPILEDFUNCTION_GET_FUNCS_END(heap,h) \ + ((duk_hobject **) (void *) DUK_HCOMPILEDFUNCTION_GET_BYTECODE((heap), (h))) + +/* XXX: double evaluation of DUK_HCOMPILEDFUNCTION_GET_DATA() */ +#define DUK_HCOMPILEDFUNCTION_GET_CODE_END(heap,h) \ + ((duk_instr_t *) (void *) (DUK_HBUFFER_FIXED_GET_DATA_PTR((heap), DUK_HCOMPILEDFUNCTION_GET_DATA((heap), (h))) + \ + DUK_HBUFFER_GET_SIZE((duk_hbuffer *) DUK_HCOMPILEDFUNCTION_GET_DATA((heap), h)))) + +#define DUK_HCOMPILEDFUNCTION_GET_CONSTS_SIZE(heap,h) \ + ( \ + (duk_size_t) \ + ( \ + ((const duk_uint8_t *) DUK_HCOMPILEDFUNCTION_GET_CONSTS_END((heap), (h))) - \ + ((const duk_uint8_t *) DUK_HCOMPILEDFUNCTION_GET_CONSTS_BASE((heap), (h))) \ + ) \ + ) + +#define DUK_HCOMPILEDFUNCTION_GET_FUNCS_SIZE(heap,h) \ + ( \ + (duk_size_t) \ + ( \ + ((const duk_uint8_t *) DUK_HCOMPILEDFUNCTION_GET_FUNCS_END((heap), (h))) - \ + ((const duk_uint8_t *) DUK_HCOMPILEDFUNCTION_GET_FUNCS_BASE((heap), (h))) \ + ) \ + ) + +#define DUK_HCOMPILEDFUNCTION_GET_CODE_SIZE(heap,h) \ + ( \ + (duk_size_t) \ + ( \ + ((const duk_uint8_t *) DUK_HCOMPILEDFUNCTION_GET_CODE_END((heap),(h))) - \ + ((const duk_uint8_t *) DUK_HCOMPILEDFUNCTION_GET_CODE_BASE((heap),(h))) \ + ) \ + ) + +#define DUK_HCOMPILEDFUNCTION_GET_CONSTS_COUNT(heap,h) \ + ((duk_size_t) (DUK_HCOMPILEDFUNCTION_GET_CONSTS_SIZE((heap), (h)) / sizeof(duk_tval))) + +#define DUK_HCOMPILEDFUNCTION_GET_FUNCS_COUNT(heap,h) \ + ((duk_size_t) (DUK_HCOMPILEDFUNCTION_GET_FUNCS_SIZE((heap), (h)) / sizeof(duk_hobject *))) + +#define DUK_HCOMPILEDFUNCTION_GET_CODE_COUNT(heap,h) \ + ((duk_size_t) (DUK_HCOMPILEDFUNCTION_GET_CODE_SIZE((heap), (h)) / sizeof(duk_instr_t))) + + +/* + * Main struct + */ + +struct duk_hcompiledfunction { + /* shared object part */ + duk_hobject obj; + + /* + * Pointers to function data area for faster access. Function + * data is a buffer shared between all closures of the same + * "template" function. The data buffer is always fixed (non- + * dynamic, hence stable), with a layout as follows: + * + * constants (duk_tval) + * inner functions (duk_hobject *) + * bytecode (duk_instr_t) + * + * Note: bytecode end address can be computed from 'data' buffer + * size. It is not strictly necessary functionally, assuming + * bytecode never jumps outside its allocated area. However, + * it's a safety/robustness feature for avoiding the chance of + * executing random data as bytecode due to a compiler error. + * + * Note: values in the data buffer must be incref'd (they will + * be decref'd on release) for every compiledfunction referring + * to the 'data' element. + */ + + /* Data area, fixed allocation, stable data ptrs. */ +#if defined(DUK_USE_HEAPPTR16) + duk_uint16_t data16; +#else + duk_hbuffer *data; +#endif + + /* No need for constants pointer (= same as data). + * + * When using 16-bit packing alignment to 4 is nice. 'funcs' will be + * 4-byte aligned because 'constants' are duk_tvals. For now the + * inner function pointers are not compressed, so that 'bytecode' will + * also be 4-byte aligned. + */ +#if defined(DUK_USE_HEAPPTR16) + duk_uint16_t funcs16; + duk_uint16_t bytecode16; +#else + duk_hobject **funcs; + duk_instr_t *bytecode; +#endif + + /* + * 'nregs' registers are allocated on function entry, at most 'nargs' + * are initialized to arguments, and the rest to undefined. Arguments + * above 'nregs' are not mapped to registers. All registers in the + * active stack range must be initialized because they are GC reachable. + * 'nargs' is needed so that if the function is given more than 'nargs' + * arguments, the additional arguments do not 'clobber' registers + * beyond 'nregs' which must be consistently initialized to undefined. + * + * Usually there is no need to know which registers are mapped to + * local variables. Registers may be allocated to variable in any + * way (even including gaps). However, a register-variable mapping + * must be the same for the duration of the function execution and + * the register cannot be used for anything else. + * + * When looking up variables by name, the '_Varmap' map is used. + * When an activation closes, registers mapped to arguments are + * copied into the environment record based on the same map. The + * reverse map (from register to variable) is not currently needed + * at run time, except for debugging, so it is not maintained. + */ + + duk_uint16_t nregs; /* regs to allocate */ + duk_uint16_t nargs; /* number of arguments allocated to regs */ + + /* + * Additional control information is placed into the object itself + * as internal properties to avoid unnecessary fields for the + * majority of functions. The compiler tries to omit internal + * control fields when possible. + * + * Function templates: + * + * { + * name: "func", // declaration, named function expressions + * fileName: <debug info for creating nice errors> + * _Varmap: { "arg1": 0, "arg2": 1, "varname": 2 }, + * _Formals: [ "arg1", "arg2" ], + * _Source: "function func(arg1, arg2) { ... }", + * _Pc2line: <debug info for pc-to-line mapping>, + * } + * + * Function instances: + * + * { + * length: 2, + * prototype: { constructor: <func> }, + * caller: <thrower>, + * arguments: <thrower>, + * name: "func", // declaration, named function expressions + * fileName: <debug info for creating nice errors> + * _Varmap: { "arg1": 0, "arg2": 1, "varname": 2 }, + * _Formals: [ "arg1", "arg2" ], + * _Source: "function func(arg1, arg2) { ... }", + * _Pc2line: <debug info for pc-to-line mapping>, + * _Varenv: <variable environment of closure>, + * _Lexenv: <lexical environment of closure (if differs from _Varenv)> + * } + * + * More detailed description of these properties can be found + * in the documentation. + */ + +#if defined(DUK_USE_DEBUGGER_SUPPORT) + /* Line number range for function. Needed during debugging to + * determine active breakpoints. + */ + duk_uint32_t start_line; + duk_uint32_t end_line; +#endif +}; + +#endif /* DUK_HCOMPILEDFUNCTION_H_INCLUDED */ |