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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* vim: set ts=8 sts=2 et sw=2 tw=80:
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "jit/Jit.h"
#include "jit/BaselineJIT.h"
#include "jit/CalleeToken.h"
#include "jit/Ion.h"
#include "jit/JitCommon.h"
#include "jit/JitRuntime.h"
#include "js/friend/StackLimits.h" // js::AutoCheckRecursionLimit
#include "vm/Interpreter.h"
#include "vm/JitActivation.h"
#include "vm/JSContext.h"
#include "vm/Realm.h"
#include "vm/Activation-inl.h"
#include "vm/JSScript-inl.h"
using namespace js;
using namespace js::jit;
static EnterJitStatus JS_HAZ_JSNATIVE_CALLER EnterJit(JSContext* cx,
RunState& state,
uint8_t* code) {
// We don't want to call the interpreter stub here (because
// C++ -> interpreterStub -> C++ is slower than staying in C++).
MOZ_ASSERT(code);
MOZ_ASSERT(code != cx->runtime()->jitRuntime()->interpreterStub().value);
MOZ_ASSERT(IsBaselineInterpreterEnabled());
AutoCheckRecursionLimit recursion(cx);
if (!recursion.check(cx)) {
return EnterJitStatus::Error;
}
// jit::Bailout(), jit::InvalidationBailout(), and jit::HandleException()
// reset the counter to zero, so assert here it's also zero when we enter
// JIT code.
MOZ_ASSERT(!cx->isInUnsafeRegion());
#ifdef DEBUG
// Assert we don't GC before entering JIT code. A GC could discard JIT code
// or move the function stored in the CalleeToken (it won't be traced at
// this point). We use Maybe<> here so we can call reset() to call the
// AutoAssertNoGC destructor before we enter JIT code.
mozilla::Maybe<JS::AutoAssertNoGC> nogc;
nogc.emplace(cx);
#endif
JSScript* script = state.script();
size_t numActualArgs;
bool constructing;
size_t maxArgc;
Value* maxArgv;
JSObject* envChain;
CalleeToken calleeToken;
if (state.isInvoke()) {
const CallArgs& args = state.asInvoke()->args();
numActualArgs = args.length();
if (TooManyActualArguments(numActualArgs)) {
// Fall back to the C++ interpreter to avoid running out of stack space.
return EnterJitStatus::NotEntered;
}
constructing = state.asInvoke()->constructing();
maxArgc = args.length() + 1;
maxArgv = args.array() - 1; // -1 to include |this|
envChain = nullptr;
calleeToken = CalleeToToken(&args.callee().as<JSFunction>(), constructing);
unsigned numFormals = script->function()->nargs();
if (numFormals > numActualArgs) {
code = cx->runtime()->jitRuntime()->getArgumentsRectifier().value;
}
} else {
numActualArgs = 0;
constructing = false;
maxArgc = 0;
maxArgv = nullptr;
envChain = state.asExecute()->environmentChain();
calleeToken = CalleeToToken(state.script());
}
// Caller must construct |this| before invoking the function.
MOZ_ASSERT_IF(constructing, maxArgv[0].isObject() ||
maxArgv[0].isMagic(JS_UNINITIALIZED_LEXICAL));
RootedValue result(cx, Int32Value(numActualArgs));
{
AssertRealmUnchanged aru(cx);
ActivationEntryMonitor entryMonitor(cx, calleeToken);
JitActivation activation(cx);
EnterJitCode enter = cx->runtime()->jitRuntime()->enterJit();
#ifdef DEBUG
nogc.reset();
#endif
CALL_GENERATED_CODE(enter, code, maxArgc, maxArgv, /* osrFrame = */ nullptr,
calleeToken, envChain, /* osrNumStackValues = */ 0,
result.address());
}
// Ensure the counter was reset to zero after exiting from JIT code.
MOZ_ASSERT(!cx->isInUnsafeRegion());
// Release temporary buffer used for OSR into Ion.
cx->runtime()->jitRuntime()->freeIonOsrTempData();
if (result.isMagic()) {
MOZ_ASSERT(result.isMagic(JS_ION_ERROR));
return EnterJitStatus::Error;
}
// Jit callers wrap primitive constructor return, except for derived
// class constructors, which are forced to do it themselves.
if (constructing && result.isPrimitive()) {
MOZ_ASSERT(maxArgv[0].isObject());
result = maxArgv[0];
}
state.setReturnValue(result);
return EnterJitStatus::Ok;
}
// Call the per-script interpreter entry trampoline.
bool js::jit::EnterInterpreterEntryTrampoline(uint8_t* code, JSContext* cx,
RunState* state) {
using EnterTrampolineCodePtr = bool (*)(JSContext * cx, RunState*);
auto funcPtr = JS_DATA_TO_FUNC_PTR(EnterTrampolineCodePtr, code);
return CALL_GENERATED_2(funcPtr, cx, state);
}
EnterJitStatus js::jit::MaybeEnterJit(JSContext* cx, RunState& state) {
if (!IsBaselineInterpreterEnabled()) {
// All JITs are disabled.
return EnterJitStatus::NotEntered;
}
// JITs do not respect the debugger's OnNativeCall hook, so JIT execution is
// disabled if this hook might need to be called.
if (cx->insideDebuggerEvaluationWithOnNativeCallHook) {
return EnterJitStatus::NotEntered;
}
JSScript* script = state.script();
uint8_t* code = script->jitCodeRaw();
#ifdef JS_CACHEIR_SPEW
cx->spewer().enableSpewing();
#endif
do {
// Make sure we can enter Baseline Interpreter code. Note that the prologue
// has warm-up checks to tier up if needed.
if (script->hasJitScript()) {
break;
}
script->incWarmUpCounter();
// Try to Ion-compile.
if (jit::IsIonEnabled(cx)) {
jit::MethodStatus status = jit::CanEnterIon(cx, state);
if (status == jit::Method_Error) {
return EnterJitStatus::Error;
}
if (status == jit::Method_Compiled) {
code = script->jitCodeRaw();
break;
}
}
// Try to Baseline-compile.
if (jit::IsBaselineJitEnabled(cx)) {
jit::MethodStatus status =
jit::CanEnterBaselineMethod<BaselineTier::Compiler>(cx, state);
if (status == jit::Method_Error) {
return EnterJitStatus::Error;
}
if (status == jit::Method_Compiled) {
code = script->jitCodeRaw();
break;
}
}
// Try to enter the Baseline Interpreter.
if (IsBaselineInterpreterEnabled()) {
jit::MethodStatus status =
jit::CanEnterBaselineMethod<BaselineTier::Interpreter>(cx, state);
if (status == jit::Method_Error) {
return EnterJitStatus::Error;
}
if (status == jit::Method_Compiled) {
code = script->jitCodeRaw();
break;
}
}
return EnterJitStatus::NotEntered;
} while (false);
#ifdef JS_CACHEIR_SPEW
cx->spewer().disableSpewing();
#endif
return EnterJit(cx, state, code);
}
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