/*
- * Copyright (C) 2009, 2010 Apple Inc. All rights reserved.
+ * Copyright (C) 2009, 2010, 2012, 2013, 2014 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
#if ENABLE(ASSEMBLER)
-#include <MacroAssembler.h>
+#define DUMP_LINK_STATISTICS 0
+#define DUMP_CODE 0
+
+#define GLOBAL_THUNK_ID reinterpret_cast<void*>(static_cast<intptr_t>(-1))
+#define REGEXP_CODE_ID reinterpret_cast<void*>(static_cast<intptr_t>(-2))
+#define CSS_CODE_ID reinterpret_cast<void*>(static_cast<intptr_t>(-3))
+
+#include "JITCompilationEffort.h"
+#include "MacroAssembler.h"
+#include <wtf/DataLog.h>
+#include <wtf/FastMalloc.h>
#include <wtf/Noncopyable.h>
namespace JSC {
+class CodeBlock;
+class VM;
+
// LinkBuffer:
//
// This class assists in linking code generated by the macro assembler, once code generation
// * The address of a Label pointing into the code may be resolved.
// * The value referenced by a DataLabel may be set.
//
-class LinkBuffer : public Noncopyable {
+class LinkBuffer {
+ WTF_MAKE_NONCOPYABLE(LinkBuffer); WTF_MAKE_FAST_ALLOCATED;
+
typedef MacroAssemblerCodeRef CodeRef;
typedef MacroAssemblerCodePtr CodePtr;
typedef MacroAssembler::Label Label;
typedef MacroAssembler::Jump Jump;
+ typedef MacroAssembler::PatchableJump PatchableJump;
typedef MacroAssembler::JumpList JumpList;
typedef MacroAssembler::Call Call;
+ typedef MacroAssembler::DataLabelCompact DataLabelCompact;
typedef MacroAssembler::DataLabel32 DataLabel32;
typedef MacroAssembler::DataLabelPtr DataLabelPtr;
- typedef MacroAssembler::JmpDst JmpDst;
+ typedef MacroAssembler::ConvertibleLoadLabel ConvertibleLoadLabel;
#if ENABLE(BRANCH_COMPACTION)
typedef MacroAssembler::LinkRecord LinkRecord;
typedef MacroAssembler::JumpLinkType JumpLinkType;
#endif
public:
- // Note: Initialization sequence is significant, since executablePool is a PassRefPtr.
- // First, executablePool is copied into m_executablePool, then the initialization of
- // m_code uses m_executablePool, *not* executablePool, since this is no longer valid.
- // The linkOffset parameter should only be non-null when recompiling for exception info
- LinkBuffer(MacroAssembler* masm, PassRefPtr<ExecutablePool> executablePool, void* linkOffset)
- : m_executablePool(executablePool)
- , m_size(0)
+ LinkBuffer(VM& vm, MacroAssembler& macroAssembler, void* ownerUID, JITCompilationEffort effort = JITCompilationMustSucceed)
+ : m_size(0)
+#if ENABLE(BRANCH_COMPACTION)
+ , m_initialSize(0)
+#endif
+ , m_didAllocate(false)
, m_code(0)
- , m_assembler(masm)
+ , m_vm(&vm)
+#ifndef NDEBUG
+ , m_completed(false)
+#endif
+ {
+ linkCode(macroAssembler, ownerUID, effort);
+ }
+
+ LinkBuffer(VM& vm, MacroAssembler& macroAssembler, void* code, size_t size)
+ : m_size(size)
+#if ENABLE(BRANCH_COMPACTION)
+ , m_initialSize(0)
+#endif
+ , m_didAllocate(false)
+ , m_code(code)
+ , m_vm(&vm)
#ifndef NDEBUG
, m_completed(false)
#endif
{
- linkCode(linkOffset);
+ linkCode(macroAssembler, 0, JITCompilationCanFail);
}
~LinkBuffer()
{
- ASSERT(m_completed);
+ }
+
+ bool didFailToAllocate() const
+ {
+ return !m_didAllocate;
}
+ bool isValid() const
+ {
+ return !didFailToAllocate();
+ }
+
// These methods are used to link or set values at code generation time.
void link(Call call, FunctionPtr function)
{
ASSERT(call.isFlagSet(Call::Linkable));
- call.m_jmp = applyOffset(call.m_jmp);
+ call.m_label = applyOffset(call.m_label);
MacroAssembler::linkCall(code(), call, function);
}
+ void link(Call call, CodeLocationLabel label)
+ {
+ link(call, FunctionPtr(label.executableAddress()));
+ }
+
void link(Jump jump, CodeLocationLabel label)
{
- jump.m_jmp = applyOffset(jump.m_jmp);
+ jump.m_label = applyOffset(jump.m_label);
MacroAssembler::linkJump(code(), jump, label);
}
void patch(DataLabelPtr label, void* value)
{
- JmpDst target = applyOffset(label.m_label);
+ AssemblerLabel target = applyOffset(label.m_label);
MacroAssembler::linkPointer(code(), target, value);
}
void patch(DataLabelPtr label, CodeLocationLabel value)
{
- JmpDst target = applyOffset(label.m_label);
+ AssemblerLabel target = applyOffset(label.m_label);
MacroAssembler::linkPointer(code(), target, value.executableAddress());
}
// These methods are used to obtain handles to allow the code to be relinked / repatched later.
+
+ CodeLocationLabel entrypoint()
+ {
+ return CodeLocationLabel(code());
+ }
CodeLocationCall locationOf(Call call)
{
ASSERT(call.isFlagSet(Call::Linkable));
ASSERT(!call.isFlagSet(Call::Near));
- return CodeLocationCall(MacroAssembler::getLinkerAddress(code(), applyOffset(call.m_jmp)));
+ return CodeLocationCall(MacroAssembler::getLinkerAddress(code(), applyOffset(call.m_label)));
}
CodeLocationNearCall locationOfNearCall(Call call)
{
ASSERT(call.isFlagSet(Call::Linkable));
ASSERT(call.isFlagSet(Call::Near));
- return CodeLocationNearCall(MacroAssembler::getLinkerAddress(code(), applyOffset(call.m_jmp)));
+ return CodeLocationNearCall(MacroAssembler::getLinkerAddress(code(), applyOffset(call.m_label)));
+ }
+
+ CodeLocationLabel locationOf(PatchableJump jump)
+ {
+ return CodeLocationLabel(MacroAssembler::getLinkerAddress(code(), applyOffset(jump.m_jump.m_label)));
}
CodeLocationLabel locationOf(Label label)
{
return CodeLocationDataLabel32(MacroAssembler::getLinkerAddress(code(), applyOffset(label.m_label)));
}
+
+ CodeLocationDataLabelCompact locationOf(DataLabelCompact label)
+ {
+ return CodeLocationDataLabelCompact(MacroAssembler::getLinkerAddress(code(), applyOffset(label.m_label)));
+ }
+
+ CodeLocationConvertibleLoad locationOf(ConvertibleLoadLabel label)
+ {
+ return CodeLocationConvertibleLoad(MacroAssembler::getLinkerAddress(code(), applyOffset(label.m_label)));
+ }
// This method obtains the return address of the call, given as an offset from
// the start of the code.
unsigned returnAddressOffset(Call call)
{
- call.m_jmp = applyOffset(call.m_jmp);
+ call.m_label = applyOffset(call.m_label);
return MacroAssembler::getLinkerCallReturnOffset(call);
}
- // Upon completion of all patching either 'finalizeCode()' or 'finalizeCodeAddendum()' should be called
- // once to complete generation of the code. 'finalizeCode()' is suited to situations
- // where the executable pool must also be retained, the lighter-weight 'finalizeCodeAddendum()' is
- // suited to adding to an existing allocation.
- CodeRef finalizeCode()
+ uint32_t offsetOf(Label label)
{
- performFinalization();
-
- return CodeRef(m_code, m_executablePool, m_size);
+ return applyOffset(label.m_label).m_offset;
}
- CodeLocationLabel finalizeCodeAddendum()
+ unsigned offsetOf(PatchableJump jump)
{
- performFinalization();
-
- return CodeLocationLabel(code());
+ return applyOffset(jump.m_jump.m_label).m_offset;
}
+ // Upon completion of all patching 'FINALIZE_CODE()' should be called once to
+ // complete generation of the code. Alternatively, call
+ // finalizeCodeWithoutDisassembly() directly if you have your own way of
+ // displaying disassembly.
+
+ JS_EXPORT_PRIVATE CodeRef finalizeCodeWithoutDisassembly();
+ JS_EXPORT_PRIVATE CodeRef finalizeCodeWithDisassembly(const char* format, ...) WTF_ATTRIBUTE_PRINTF(2, 3);
+
CodePtr trampolineAt(Label label)
{
return CodePtr(MacroAssembler::AssemblerType_T::getRelocatedAddress(code(), applyOffset(label.m_label)));
}
+ void* debugAddress()
+ {
+ return m_code;
+ }
+
+ // FIXME: this does not account for the AssemblerData size!
+ size_t size()
+ {
+ return m_size;
+ }
+
private:
+#if ENABLE(BRANCH_COMPACTION)
+ int executableOffsetFor(int location)
+ {
+ if (!location)
+ return 0;
+ return bitwise_cast<int32_t*>(m_assemblerStorage.buffer())[location / sizeof(int32_t) - 1];
+ }
+#endif
+
template <typename T> T applyOffset(T src)
{
#if ENABLE(BRANCH_COMPACTION)
- src.m_offset -= m_assembler->executableOffsetFor(src.m_offset);
+ src.m_offset -= executableOffsetFor(src.m_offset);
#endif
return src;
}
- // Keep this private! - the underlying code should only be obtained externally via
- // finalizeCode() or finalizeCodeAddendum().
+ // Keep this private! - the underlying code should only be obtained externally via finalizeCode().
void* code()
{
return m_code;
}
+
+ void allocate(size_t initialSize, void* ownerUID, JITCompilationEffort);
+ void shrink(size_t newSize);
- void linkCode(void* linkOffset)
- {
- UNUSED_PARAM(linkOffset);
- ASSERT(!m_code);
-#if !ENABLE(BRANCH_COMPACTION)
- m_code = m_assembler->m_assembler.executableCopy(m_executablePool.get());
- m_size = m_assembler->size();
-#else
- size_t initialSize = m_assembler->size();
- m_code = (uint8_t*)m_executablePool->alloc(initialSize);
- if (!m_code)
- return;
- ExecutableAllocator::makeWritable(m_code, m_assembler->size());
- uint8_t* inData = (uint8_t*)m_assembler->unlinkedCode();
- uint8_t* outData = reinterpret_cast<uint8_t*>(m_code);
- const uint8_t* linkBase = linkOffset ? reinterpret_cast<uint8_t*>(linkOffset) : outData;
- int readPtr = 0;
- int writePtr = 0;
- Vector<LinkRecord>& jumpsToLink = m_assembler->jumpsToLink();
- unsigned jumpCount = jumpsToLink.size();
- for (unsigned i = 0; i < jumpCount; ++i) {
- int offset = readPtr - writePtr;
- ASSERT(!(offset & 1));
-
- // Copy the instructions from the last jump to the current one.
- size_t regionSize = jumpsToLink[i].from() - readPtr;
- memcpy(outData + writePtr, inData + readPtr, regionSize);
- m_assembler->recordLinkOffsets(readPtr, jumpsToLink[i].from(), offset);
- readPtr += regionSize;
- writePtr += regionSize;
-
- // Calculate absolute address of the jump target, in the case of backwards
- // branches we need to be precise, forward branches we are pessimistic
- const uint8_t* target;
- if (jumpsToLink[i].to() >= jumpsToLink[i].from())
- target = linkBase + jumpsToLink[i].to() - offset; // Compensate for what we have collapsed so far
- else
- target = linkBase + jumpsToLink[i].to() - m_assembler->executableOffsetFor(jumpsToLink[i].to());
-
- JumpLinkType jumpLinkType = m_assembler->computeJumpType(jumpsToLink[i], linkBase + writePtr, target);
- // Compact branch if we can...
- if (m_assembler->canCompact(jumpsToLink[i].type())) {
- // Step back in the write stream
- int32_t delta = m_assembler->jumpSizeDelta(jumpsToLink[i].type(), jumpLinkType);
- if (delta) {
- writePtr -= delta;
- m_assembler->recordLinkOffsets(jumpsToLink[i].from() - delta, readPtr, readPtr - writePtr);
- }
- }
- jumpsToLink[i].setFrom(writePtr);
- }
- // Copy everything after the last jump
- memcpy(outData + writePtr, inData + readPtr, m_assembler->size() - readPtr);
- m_assembler->recordLinkOffsets(readPtr, m_assembler->size(), readPtr - writePtr);
-
- // Actually link everything (don't link if we've be given a linkoffset as it's a
- // waste of time: linkOffset is used for recompiling to get exception info)
- if (!linkOffset) {
- for (unsigned i = 0; i < jumpCount; ++i) {
- uint8_t* location = outData + jumpsToLink[i].from();
- uint8_t* target = outData + jumpsToLink[i].to() - m_assembler->executableOffsetFor(jumpsToLink[i].to());
- m_assembler->link(jumpsToLink[i], location, target);
- }
- }
-
- jumpsToLink.clear();
- m_size = writePtr + m_assembler->size() - readPtr;
- m_executablePool->tryShrink(m_code, initialSize, m_size);
-#endif
- }
-
- void performFinalization()
- {
-#ifndef NDEBUG
- ASSERT(!m_completed);
- m_completed = true;
+ JS_EXPORT_PRIVATE void linkCode(MacroAssembler&, void* ownerUID, JITCompilationEffort);
+#if ENABLE(BRANCH_COMPACTION)
+ template <typename InstructionType>
+ void copyCompactAndLinkCode(MacroAssembler&, void* ownerUID, JITCompilationEffort);
#endif
- ExecutableAllocator::makeExecutable(code(), m_size);
- ExecutableAllocator::cacheFlush(code(), m_size);
- }
+ void performFinalization();
- RefPtr<ExecutablePool> m_executablePool;
+#if DUMP_LINK_STATISTICS
+ static void dumpLinkStatistics(void* code, size_t initialSize, size_t finalSize);
+#endif
+
+#if DUMP_CODE
+ static void dumpCode(void* code, size_t);
+#endif
+
+ RefPtr<ExecutableMemoryHandle> m_executableMemory;
size_t m_size;
+#if ENABLE(BRANCH_COMPACTION)
+ size_t m_initialSize;
+ AssemblerData m_assemblerStorage;
+#endif
+ bool m_didAllocate;
void* m_code;
- MacroAssembler* m_assembler;
+ VM* m_vm;
#ifndef NDEBUG
bool m_completed;
#endif
};
+#define FINALIZE_CODE_IF(condition, linkBufferReference, dataLogFArgumentsForHeading) \
+ (UNLIKELY((condition)) \
+ ? ((linkBufferReference).finalizeCodeWithDisassembly dataLogFArgumentsForHeading) \
+ : (linkBufferReference).finalizeCodeWithoutDisassembly())
+
+bool shouldShowDisassemblyFor(CodeBlock*);
+
+#define FINALIZE_CODE_FOR(codeBlock, linkBufferReference, dataLogFArgumentsForHeading) \
+ FINALIZE_CODE_IF(shouldShowDisassemblyFor(codeBlock), linkBufferReference, dataLogFArgumentsForHeading)
+
+// Use this to finalize code, like so:
+//
+// CodeRef code = FINALIZE_CODE(linkBuffer, ("my super thingy number %d", number));
+//
+// Which, in disassembly mode, will print:
+//
+// Generated JIT code for my super thingy number 42:
+// Code at [0x123456, 0x234567]:
+// 0x123456: mov $0, 0
+// 0x12345a: ret
+//
+// ... and so on.
+//
+// Note that the dataLogFArgumentsForHeading are only evaluated when showDisassembly
+// is true, so you can hide expensive disassembly-only computations inside there.
+
+#define FINALIZE_CODE(linkBufferReference, dataLogFArgumentsForHeading) \
+ FINALIZE_CODE_IF(JSC::Options::showDisassembly(), linkBufferReference, dataLogFArgumentsForHeading)
+
+#define FINALIZE_DFG_CODE(linkBufferReference, dataLogFArgumentsForHeading) \
+ FINALIZE_CODE_IF((JSC::Options::showDisassembly() || Options::showDFGDisassembly()), linkBufferReference, dataLogFArgumentsForHeading)
+
} // namespace JSC
#endif // ENABLE(ASSEMBLER)
projects / apple / javascriptcore.git / blobdiff