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/*
* Copyright (C) 2009-2022 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* 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,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include "ExecutableMemoryHandle.h"
#include "JSCPtrTag.h"
#include <wtf/CodePtr.h>
#include <wtf/DataLog.h>
#include <wtf/PrintStream.h>
#include <wtf/RefPtr.h>
#include <wtf/text/CString.h>
#if CPU(ARM_THUMB2) && ENABLE(JIT)
// ARM instructions must be 16-bit aligned. Thumb2 code pointers to be loaded into
// into the processor are decorated with the bottom bit set, while traditional ARM has
// the lower bit clear. Since we don't know what kind of pointer, we check for both
// decorated and undecorated null.
#define ASSERT_VALID_CODE_OFFSET(offset) \
ASSERT(!(offset & 1)) // Must be multiple of 2.
#else
#define ASSERT_VALID_CODE_OFFSET(offset) // Anything goes!
#endif
namespace JSC {
namespace Wasm {
enum class CompilationMode : uint8_t;
} // namespace Wasm
class CodeBlock;
enum OpcodeID : unsigned;
// MacroAssemblerCodeRef:
//
// A reference to a section of JIT generated code. A CodeRef consists of a
// pointer to the code, and a ref pointer to the pool from within which it
// was allocated.
class MacroAssemblerCodeRefBase {
protected:
static bool tryToDisassemble(CodePtr<DisassemblyPtrTag>, size_t, const char* prefix, PrintStream& out);
static bool tryToDisassemble(CodePtr<DisassemblyPtrTag>, size_t, const char* prefix);
JS_EXPORT_PRIVATE static CString disassembly(CodePtr<DisassemblyPtrTag>, size_t);
};
template<PtrTag tag>
class MacroAssemblerCodeRef : private MacroAssemblerCodeRefBase {
private:
// This is private because it's dangerous enough that we want uses of it
// to be easy to find - hence the static create method below.
explicit MacroAssemblerCodeRef(CodePtr<tag> codePtr)
: m_codePtr(codePtr)
{
ASSERT(m_codePtr);
}
public:
MacroAssemblerCodeRef() = default;
MacroAssemblerCodeRef(Ref<ExecutableMemoryHandle>&& executableMemory)
: m_codePtr(executableMemory->start().retaggedPtr<tag>())
, m_executableMemory(WTFMove(executableMemory))
{
ASSERT(m_executableMemory->start());
ASSERT(m_codePtr);
}
template<PtrTag otherTag>
MacroAssemblerCodeRef& operator=(const MacroAssemblerCodeRef<otherTag>& otherCodeRef)
{
m_codePtr = CodePtr<tag>::fromTaggedPtr(otherCodeRef.code().template retaggedPtr<tag>());
m_executableMemory = otherCodeRef.m_executableMemory;
return *this;
}
// Use this only when you know that the codePtr refers to code that is
// already being kept alive through some other means. Typically this means
// that codePtr is immortal.
static MacroAssemblerCodeRef createSelfManagedCodeRef(CodePtr<tag> codePtr)
{
return MacroAssemblerCodeRef(codePtr);
}
ExecutableMemoryHandle* executableMemory() const
{
return m_executableMemory.get();
}
CodePtr<tag> code() const
{
return m_codePtr;
}
template<PtrTag newTag>
CodePtr<newTag> retaggedCode() const
{
return m_codePtr.template retagged<newTag>();
}
template<PtrTag newTag>
MacroAssemblerCodeRef<newTag> retagged() const
{
return MacroAssemblerCodeRef<newTag>(*this);
}
size_t size() const
{
if (!m_executableMemory)
return 0;
return m_executableMemory->sizeInBytes();
}
bool tryToDisassemble(PrintStream& out, const char* prefix = "") const
{
return tryToDisassemble(retaggedCode<DisassemblyPtrTag>(), size(), prefix, out);
}
bool tryToDisassemble(const char* prefix = "") const
{
return tryToDisassemble(retaggedCode<DisassemblyPtrTag>(), size(), prefix);
}
CString disassembly() const
{
return MacroAssemblerCodeRefBase::disassembly(retaggedCode<DisassemblyPtrTag>(), size());
}
explicit operator bool() const { return !!m_codePtr; }
void dump(PrintStream& out) const
{
m_codePtr.dumpWithName("CodeRef"_s, out);
}
static constexpr ptrdiff_t offsetOfCodePtr() { return OBJECT_OFFSETOF(MacroAssemblerCodeRef, m_codePtr); }
private:
template<PtrTag otherTag>
MacroAssemblerCodeRef(const MacroAssemblerCodeRef<otherTag>& otherCodeRef)
{
*this = otherCodeRef;
}
CodePtr<tag> m_codePtr;
RefPtr<ExecutableMemoryHandle> m_executableMemory;
template<PtrTag> friend class MacroAssemblerCodeRef;
};
bool shouldDumpDisassemblyFor(CodeBlock*);
bool shouldDumpDisassemblyFor(Wasm::CompilationMode);
} // namespace JSC
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