The Tor Browser / file diff

     1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/js/src/jit/shared/BaselineCompiler-shared.cpp	Wed Dec 31 06:09:35 2014 +0100
     1.3 @@ -0,0 +1,103 @@
     1.4 +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
     1.5 + * vim: set ts=8 sts=4 et sw=4 tw=99:
     1.6 + * This Source Code Form is subject to the terms of the Mozilla Public
     1.7 + * License, v. 2.0. If a copy of the MPL was not distributed with this
     1.8 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
     1.9 +
    1.10 +#include "jit/shared/BaselineCompiler-shared.h"
    1.11 +
    1.12 +#include "jit/BaselineIC.h"
    1.13 +#include "jit/VMFunctions.h"
    1.14 +
    1.15 +using namespace js;
    1.16 +using namespace js::jit;
    1.17 +
    1.18 +BaselineCompilerShared::BaselineCompilerShared(JSContext *cx, TempAllocator &alloc, JSScript *script)
    1.19 +  : cx(cx),
    1.20 +    script(script),
    1.21 +    pc(script->code()),
    1.22 +    ionCompileable_(jit::IsIonEnabled(cx) && CanIonCompileScript(cx, script, false)),
    1.23 +    ionOSRCompileable_(jit::IsIonEnabled(cx) && CanIonCompileScript(cx, script, true)),
    1.24 +    debugMode_(cx->compartment()->debugMode()),
    1.25 +    alloc_(alloc),
    1.26 +    analysis_(alloc, script),
    1.27 +    frame(script, masm),
    1.28 +    stubSpace_(),
    1.29 +    icEntries_(),
    1.30 +    pcMappingEntries_(),
    1.31 +    icLoadLabels_(),
    1.32 +    pushedBeforeCall_(0),
    1.33 +    inCall_(false),
    1.34 +    spsPushToggleOffset_()
    1.35 +{ }
    1.36 +
    1.37 +bool
    1.38 +BaselineCompilerShared::callVM(const VMFunction &fun, CallVMPhase phase)
    1.39 +{
    1.40 +    JitCode *code = cx->runtime()->jitRuntime()->getVMWrapper(fun);
    1.41 +    if (!code)
    1.42 +        return false;
    1.43 +
    1.44 +#ifdef DEBUG
    1.45 +    // Assert prepareVMCall() has been called.
    1.46 +    JS_ASSERT(inCall_);
    1.47 +    inCall_ = false;
    1.48 +#endif
    1.49 +
    1.50 +    // Compute argument size. Note that this include the size of the frame pointer
    1.51 +    // pushed by prepareVMCall.
    1.52 +    uint32_t argSize = fun.explicitStackSlots() * sizeof(void *) + sizeof(void *);
    1.53 +
    1.54 +    // Assert all arguments were pushed.
    1.55 +    JS_ASSERT(masm.framePushed() - pushedBeforeCall_ == argSize);
    1.56 +
    1.57 +    Address frameSizeAddress(BaselineFrameReg, BaselineFrame::reverseOffsetOfFrameSize());
    1.58 +    uint32_t frameVals = frame.nlocals() + frame.stackDepth();
    1.59 +    uint32_t frameBaseSize = BaselineFrame::FramePointerOffset + BaselineFrame::Size();
    1.60 +    uint32_t frameFullSize = frameBaseSize + (frameVals * sizeof(Value));
    1.61 +    if (phase == POST_INITIALIZE) {
    1.62 +        masm.store32(Imm32(frameFullSize), frameSizeAddress);
    1.63 +        uint32_t descriptor = MakeFrameDescriptor(frameFullSize + argSize, JitFrame_BaselineJS);
    1.64 +        masm.push(Imm32(descriptor));
    1.65 +
    1.66 +    } else if (phase == PRE_INITIALIZE) {
    1.67 +        masm.store32(Imm32(frameBaseSize), frameSizeAddress);
    1.68 +        uint32_t descriptor = MakeFrameDescriptor(frameBaseSize + argSize, JitFrame_BaselineJS);
    1.69 +        masm.push(Imm32(descriptor));
    1.70 +
    1.71 +    } else {
    1.72 +        JS_ASSERT(phase == CHECK_OVER_RECURSED);
    1.73 +        Label afterWrite;
    1.74 +        Label writePostInitialize;
    1.75 +
    1.76 +        // If OVER_RECURSED is set, then frame locals haven't been pushed yet.
    1.77 +        masm.branchTest32(Assembler::Zero,
    1.78 +                          frame.addressOfFlags(),
    1.79 +                          Imm32(BaselineFrame::OVER_RECURSED),
    1.80 +                          &writePostInitialize);
    1.81 +
    1.82 +        masm.move32(Imm32(frameBaseSize), BaselineTailCallReg);
    1.83 +        masm.jump(&afterWrite);
    1.84 +
    1.85 +        masm.bind(&writePostInitialize);
    1.86 +        masm.move32(Imm32(frameFullSize), BaselineTailCallReg);
    1.87 +
    1.88 +        masm.bind(&afterWrite);
    1.89 +        masm.store32(BaselineTailCallReg, frameSizeAddress);
    1.90 +        masm.add32(Imm32(argSize), BaselineTailCallReg);
    1.91 +        masm.makeFrameDescriptor(BaselineTailCallReg, JitFrame_BaselineJS);
    1.92 +        masm.push(BaselineTailCallReg);
    1.93 +    }
    1.94 +
    1.95 +    // Perform the call.
    1.96 +    masm.call(code);
    1.97 +    uint32_t callOffset = masm.currentOffset();
    1.98 +    masm.pop(BaselineFrameReg);
    1.99 +
   1.100 +    // Add a fake ICEntry (without stubs), so that the return offset to
   1.101 +    // pc mapping works.
   1.102 +    ICEntry entry(script->pcToOffset(pc), ICEntry::Kind_CallVM);
   1.103 +    entry.setReturnOffset(callOffset);
   1.104 +
   1.105 +    return icEntries_.append(entry);
   1.106 +}