/*
- * Copyright (C) 2009, 2010 Apple Inc. All rights reserved.
+ * Copyright (C) 2009, 2010, 2012 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
#define DUMP_LINK_STATISTICS 0
#define DUMP_CODE 0
-#include <MacroAssembler.h>
+#define GLOBAL_THUNK_ID reinterpret_cast<void*>(static_cast<intptr_t>(-1))
+#define REGEXP_CODE_ID reinterpret_cast<void*>(static_cast<intptr_t>(-2))
+
+#include "JITCompilationEffort.h"
+#include "MacroAssembler.h"
+#include <wtf/DataLog.h>
#include <wtf/Noncopyable.h>
namespace JSC {
-class JSGlobalData;
+class VM;
// LinkBuffer:
//
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::ConvertibleLoadLabel ConvertibleLoadLabel;
#if ENABLE(BRANCH_COMPACTION)
typedef MacroAssembler::LinkRecord LinkRecord;
typedef MacroAssembler::JumpLinkType JumpLinkType;
#endif
public:
- LinkBuffer(JSGlobalData& globalData, MacroAssembler* masm, PassRefPtr<ExecutablePool> executablePool)
- : m_executablePool(executablePool)
- , m_size(0)
- , m_code(0)
- , m_assembler(masm)
- , m_globalData(&globalData)
-#ifndef NDEBUG
- , m_completed(false)
+ LinkBuffer(VM& vm, MacroAssembler* masm, void* ownerUID, JITCompilationEffort effort = JITCompilationMustSucceed)
+ : m_size(0)
+#if ENABLE(BRANCH_COMPACTION)
+ , m_initialSize(0)
#endif
- {
- linkCode();
- }
-
- LinkBuffer(JSGlobalData& globalData, MacroAssembler* masm, ExecutableAllocator& allocator)
- : m_executablePool(allocator.poolForSize(globalData, masm->m_assembler.codeSize()))
- , m_size(0)
, m_code(0)
, m_assembler(masm)
- , m_globalData(&globalData)
+ , m_vm(&vm)
#ifndef NDEBUG
, m_completed(false)
+ , m_effort(effort)
#endif
{
- linkCode();
+ linkCode(ownerUID, effort);
}
~LinkBuffer()
{
- ASSERT(m_completed);
+ ASSERT(m_completed || (!m_executableMemory && m_effort == JITCompilationCanFail));
+ }
+
+ bool didFailToAllocate() const
+ {
+ return !m_executableMemory;
}
+ 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(Jump jump, CodeLocationLabel label)
{
- jump.m_jmp = applyOffset(jump.m_jmp);
+ jump.m_label = applyOffset(jump.m_label);
MacroAssembler::linkJump(code(), jump, label);
}
{
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 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()
- {
- performFinalization();
-
- return CodeLocationLabel(code());
- }
+ // 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.
+
+ CodeRef finalizeCodeWithoutDisassembly();
+ 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)));
}
-#ifndef NDEBUG
void* debugAddress()
{
return m_code;
}
-#endif
+
+ size_t debugSize()
+ {
+ return m_size;
+ }
private:
template <typename T> T applyOffset(T src)
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 linkCode()
- {
- ASSERT(!m_code);
-#if !ENABLE(BRANCH_COMPACTION)
- m_code = m_assembler->m_assembler.executableCopy(*m_globalData, m_executablePool.get());
- m_size = m_assembler->m_assembler.codeSize();
- ASSERT(m_code);
-#else
- size_t initialSize = m_assembler->m_assembler.codeSize();
- m_code = (uint8_t*)m_executablePool->alloc(*m_globalData, initialSize);
- if (!m_code)
- return;
- ExecutableAllocator::makeWritable(m_code, initialSize);
- uint8_t* inData = (uint8_t*)m_assembler->unlinkedCode();
- uint8_t* outData = reinterpret_cast<uint8_t*>(m_code);
- 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;
- uint16_t* copySource = reinterpret_cast<uint16_t*>(inData + readPtr);
- uint16_t* copyEnd = reinterpret_cast<uint16_t*>(inData + readPtr + regionSize);
- uint16_t* copyDst = reinterpret_cast<uint16_t*>(outData + writePtr);
- ASSERT(!(regionSize % 2));
- ASSERT(!(readPtr % 2));
- ASSERT(!(writePtr % 2));
- while (copySource != copyEnd)
- *copyDst++ = *copySource++;
- 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 = outData + jumpsToLink[i].to() - offset; // Compensate for what we have collapsed so far
- else
- target = outData + jumpsToLink[i].to() - m_assembler->executableOffsetFor(jumpsToLink[i].to());
-
- JumpLinkType jumpLinkType = m_assembler->computeJumpType(jumpsToLink[i], outData + 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, initialSize - readPtr);
- m_assembler->recordLinkOffsets(readPtr, initialSize, readPtr - writePtr);
-
- 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 + initialSize - readPtr;
- m_executablePool->tryShrink(m_code, initialSize, m_size);
-
-#if DUMP_LINK_STATISTICS
- dumpLinkStatistics(m_code, initialSize, m_size);
-#endif
-#if DUMP_CODE
- dumpCode(m_code, m_size);
-#endif
-#endif
- }
-
- void performFinalization()
- {
-#ifndef NDEBUG
- ASSERT(!m_completed);
- m_completed = true;
+ void linkCode(void* ownerUID, JITCompilationEffort);
+#if ENABLE(BRANCH_COMPACTION)
+ template <typename InstructionType>
+ void copyCompactAndLinkCode(void* ownerUID, JITCompilationEffort);
#endif
- ExecutableAllocator::makeExecutable(code(), m_size);
- ExecutableAllocator::cacheFlush(code(), m_size);
- }
+ void performFinalization();
#if DUMP_LINK_STATISTICS
- static void dumpLinkStatistics(void* code, size_t initialSize, size_t finalSize)
- {
- static unsigned linkCount = 0;
- static unsigned totalInitialSize = 0;
- static unsigned totalFinalSize = 0;
- linkCount++;
- totalInitialSize += initialSize;
- totalFinalSize += finalSize;
- printf("link %p: orig %u, compact %u (delta %u, %.2f%%)\n",
- code, static_cast<unsigned>(initialSize), static_cast<unsigned>(finalSize),
- static_cast<unsigned>(initialSize - finalSize),
- 100.0 * (initialSize - finalSize) / initialSize);
- printf("\ttotal %u: orig %u, compact %u (delta %u, %.2f%%)\n",
- linkCount, totalInitialSize, totalFinalSize, totalInitialSize - totalFinalSize,
- 100.0 * (totalInitialSize - totalFinalSize) / totalInitialSize);
- }
+ static void dumpLinkStatistics(void* code, size_t initialSize, size_t finalSize);
#endif
#if DUMP_CODE
- static void dumpCode(void* code, size_t size)
- {
-#if CPU(ARM_THUMB2)
- // Dump the generated code in an asm file format that can be assembled and then disassembled
- // for debugging purposes. For example, save this output as jit.s:
- // gcc -arch armv7 -c jit.s
- // otool -tv jit.o
- static unsigned codeCount = 0;
- unsigned short* tcode = static_cast<unsigned short*>(code);
- size_t tsize = size / sizeof(short);
- char nameBuf[128];
- snprintf(nameBuf, sizeof(nameBuf), "_jsc_jit%u", codeCount++);
- printf("\t.syntax unified\n"
- "\t.section\t__TEXT,__text,regular,pure_instructions\n"
- "\t.globl\t%s\n"
- "\t.align 2\n"
- "\t.code 16\n"
- "\t.thumb_func\t%s\n"
- "# %p\n"
- "%s:\n", nameBuf, nameBuf, code, nameBuf);
-
- for (unsigned i = 0; i < tsize; i++)
- printf("\t.short\t0x%x\n", tcode[i]);
-#endif
- }
+ static void dumpCode(void* code, size_t);
#endif
- RefPtr<ExecutablePool> m_executablePool;
+ RefPtr<ExecutableMemoryHandle> m_executableMemory;
size_t m_size;
+#if ENABLE(BRANCH_COMPACTION)
+ size_t m_initialSize;
+#endif
void* m_code;
MacroAssembler* m_assembler;
- JSGlobalData* m_globalData;
+ VM* m_vm;
#ifndef NDEBUG
bool m_completed;
+ JITCompilationEffort m_effort;
#endif
};
+#define FINALIZE_CODE_IF(condition, linkBufferReference, dataLogFArgumentsForHeading) \
+ (UNLIKELY((condition)) \
+ ? ((linkBufferReference).finalizeCodeWithDisassembly dataLogFArgumentsForHeading) \
+ : (linkBufferReference).finalizeCodeWithoutDisassembly())
+
+// 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(Options::showDisassembly(), linkBufferReference, dataLogFArgumentsForHeading)
+
+#define FINALIZE_DFG_CODE(linkBufferReference, dataLogFArgumentsForHeading) \
+ FINALIZE_CODE_IF((Options::showDisassembly() || Options::showDFGDisassembly()), linkBufferReference, dataLogFArgumentsForHeading)
+
} // namespace JSC
#endif // ENABLE(ASSEMBLER)
projects / apple / javascriptcore.git / blobdiff