WebKit/Source/JavaScriptCore/assembler/ProbeContext.cpp at main · WebKit/WebKit · GitHub

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* Redistribution and use in source and binary forms, with or without

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* notice, this list of conditions and the following disclaimer.

* 2. Redistributions in binary form must reproduce the above copyright

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* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY

* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR

* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,

* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,

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#include "config.h"

#include "ProbeContext.h"

#if ENABLE(ASSEMBLER)

#include <wtf/TZoneMallocInlines.h>

namespace JSC {

namespace Probe {

static void SYSV_ABI flushDirtyStackPages(State*);

extern "C" void SYSV_ABI executeJSCJITProbe(State* state)

{

Context context(state);

#if CPU(ARM64)

auto& cpu = context.cpu;

void* originalLR = cpu.gpr<void*>(ARM64Registers::lr);

void* originalPC = cpu.pc();

#endif

state->initializeStackFunction = nullptr;

state->initializeStackArg = nullptr;

state->probeFunction(context);

#if CPU(ARM64)

// The ARM64 probe trampoline does not support changing both lr and pc.

RELEASE_ASSERT(originalPC == cpu.pc() || originalLR == cpu.gpr<void*>(ARM64Registers::lr));

#endif

if (context.hasWritesToFlush()) {

context.stack().setSavedStackPointer(state->cpu.sp());

void* lowWatermark = context.stack().lowWatermarkFromVisitingDirtyPages();

state->cpu.sp() = std::min(lowWatermark, state->cpu.sp());

state->initializeStackFunction = flushDirtyStackPages;

state->initializeStackArg = context.releaseStack();

}

static void SYSV_ABI flushDirtyStackPages(State* state)

{

std::unique_ptr<Stack> stack(reinterpret_cast<Probe::Stack*>(state->initializeStackArg));

stack->flushWrites();

state->cpu.sp() = stack->savedStackPointer();

}

// Not for general use. This should only be for writing tests.

JS_EXPORT_PRIVATE void* probeStateForContext(Context&);

void* probeStateForContext(Context& context)

{

return context.m_state;

}

} // namespace Probe

} // namespace JSC

#endif // ENABLE(ASSEMBLER)

WebKit/Source/JavaScriptCore/assembler/ProbeContext.cpp at main · WebKit/WebKit · GitHub

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