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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
* 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/shared/BaselineCompiler-shared.h"
#include "jit/BaselineIC.h"
#include "jit/VMFunctions.h"
#include "jsscriptinlines.h"
#include "jit/MacroAssembler-inl.h"
using namespace js;
using namespace js::jit;
BaselineCompilerShared::BaselineCompilerShared(JSContext* cx, TempAllocator& alloc, JSScript* script)
: cx(cx),
script(script),
pc(script->code()),
ionCompileable_(jit::IsIonEnabled(cx) && CanIonCompileScript(cx, script, false)),
ionOSRCompileable_(jit::IsIonEnabled(cx) && CanIonCompileScript(cx, script, true)),
compileDebugInstrumentation_(script->isDebuggee()),
alloc_(alloc),
analysis_(alloc, script),
frame(script, masm),
stubSpace_(),
icEntries_(),
pcMappingEntries_(),
icLoadLabels_(),
pushedBeforeCall_(0),
#ifdef DEBUG
inCall_(false),
#endif
spsPushToggleOffset_(),
profilerEnterFrameToggleOffset_(),
profilerExitFrameToggleOffset_(),
traceLoggerToggleOffsets_(cx),
traceLoggerScriptTextIdOffset_()
{ }
void
BaselineCompilerShared::prepareVMCall()
{
pushedBeforeCall_ = masm.framePushed();
#ifdef DEBUG
inCall_ = true;
#endif
// Ensure everything is synced.
frame.syncStack(0);
// Save the frame pointer.
masm.Push(BaselineFrameReg);
}
bool
BaselineCompilerShared::callVM(const VMFunction& fun, CallVMPhase phase)
{
JitCode* code = cx->runtime()->jitRuntime()->getVMWrapper(fun);
if (!code)
return false;
#ifdef DEBUG
// Assert prepareVMCall() has been called.
MOZ_ASSERT(inCall_);
inCall_ = false;
// Assert the frame does not have an override pc when we're executing JIT code.
{
Label ok;
masm.branchTest32(Assembler::Zero, frame.addressOfFlags(),
Imm32(BaselineFrame::HAS_OVERRIDE_PC), &ok);
masm.assumeUnreachable("BaselineFrame shouldn't override pc when executing JIT code");
masm.bind(&ok);
}
#endif
// Compute argument size. Note that this include the size of the frame pointer
// pushed by prepareVMCall.
uint32_t argSize = fun.explicitStackSlots() * sizeof(void*) + sizeof(void*);
// Assert all arguments were pushed.
MOZ_ASSERT(masm.framePushed() - pushedBeforeCall_ == argSize);
Address frameSizeAddress(BaselineFrameReg, BaselineFrame::reverseOffsetOfFrameSize());
uint32_t frameVals = frame.nlocals() + frame.stackDepth();
uint32_t frameBaseSize = BaselineFrame::FramePointerOffset + BaselineFrame::Size();
uint32_t frameFullSize = frameBaseSize + (frameVals * sizeof(Value));
if (phase == POST_INITIALIZE) {
masm.store32(Imm32(frameFullSize), frameSizeAddress);
uint32_t descriptor = MakeFrameDescriptor(frameFullSize + argSize, JitFrame_BaselineJS,
ExitFrameLayout::Size());
masm.push(Imm32(descriptor));
} else if (phase == PRE_INITIALIZE) {
masm.store32(Imm32(frameBaseSize), frameSizeAddress);
uint32_t descriptor = MakeFrameDescriptor(frameBaseSize + argSize, JitFrame_BaselineJS,
ExitFrameLayout::Size());
masm.push(Imm32(descriptor));
} else {
MOZ_ASSERT(phase == CHECK_OVER_RECURSED);
Label afterWrite;
Label writePostInitialize;
// If OVER_RECURSED is set, then frame locals haven't been pushed yet.
masm.branchTest32(Assembler::Zero,
frame.addressOfFlags(),
Imm32(BaselineFrame::OVER_RECURSED),
&writePostInitialize);
masm.move32(Imm32(frameBaseSize), ICTailCallReg);
masm.jump(&afterWrite);
masm.bind(&writePostInitialize);
masm.move32(Imm32(frameFullSize), ICTailCallReg);
masm.bind(&afterWrite);
masm.store32(ICTailCallReg, frameSizeAddress);
masm.add32(Imm32(argSize), ICTailCallReg);
masm.makeFrameDescriptor(ICTailCallReg, JitFrame_BaselineJS, ExitFrameLayout::Size());
masm.push(ICTailCallReg);
}
MOZ_ASSERT(fun.expectTailCall == NonTailCall);
// Perform the call.
masm.call(code);
uint32_t callOffset = masm.currentOffset();
masm.pop(BaselineFrameReg);
#ifdef DEBUG
// Assert the frame does not have an override pc when we're executing JIT code.
{
Label ok;
masm.branchTest32(Assembler::Zero, frame.addressOfFlags(),
Imm32(BaselineFrame::HAS_OVERRIDE_PC), &ok);
masm.assumeUnreachable("BaselineFrame shouldn't override pc after VM call");
masm.bind(&ok);
}
#endif
// Add a fake ICEntry (without stubs), so that the return offset to
// pc mapping works.
return appendICEntry(ICEntry::Kind_CallVM, callOffset);
}
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