webkitgtk-2.16.5HEADwebkitgtk-2.16.5master

1 files changed, 317 insertions, 65 deletions

diff --git a/Source/JavaScriptCore/llint/LLIntData.cpp b/Source/JavaScriptCore/llint/LLIntData.cpp
index ac77836c0..8b615a1a3 100644
--- a/Source/JavaScriptCore/llint/LLIntData.cpp
+++ b/Source/JavaScriptCore/llint/LLIntData.cpp
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2011 Apple Inc. All rights reserved.
+ * Copyright (C) 2011, 2016 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -26,38 +26,53 @@
 #include "config.h"
 #include "LLIntData.h"
 
-#if ENABLE(LLINT)
-
+#include "ArithProfile.h"
 #include "BytecodeConventions.h"
+#include "CodeBlock.h"
 #include "CodeType.h"
+#include "InitializeThreading.h"
 #include "Instruction.h"
 #include "JSScope.h"
 #include "LLIntCLoop.h"
+#include "LLIntCommon.h"
+#include "MaxFrameExtentForSlowPathCall.h"
 #include "Opcode.h"
 #include "PropertyOffset.h"
+#include "ShadowChicken.h"
+#include "WriteBarrier.h"
+#include <string>
+#include <wtf/NeverDestroyed.h>
+
+#define STATIC_ASSERT(cond) static_assert(cond, "LLInt assumes " #cond)
 
 namespace JSC { namespace LLInt {
 
 Instruction* Data::s_exceptionInstructions = 0;
-Opcode* Data::s_opcodeMap = 0;
+Opcode Data::s_opcodeMap[numOpcodeIDs] = { };
+OpcodeStatsArray* Data::s_opcodeStatsArray = nullptr;
+
+#if ENABLE(JIT)
+extern "C" void llint_entry(void*);
+#endif
 
 void initialize()
 {
     Data::s_exceptionInstructions = new Instruction[maxOpcodeLength + 1];
-    Data::s_opcodeMap = new Opcode[numOpcodeIDs];
 
-    #if ENABLE(LLINT_C_LOOP)
+#if !ENABLE(JIT)
     CLoop::initialize();
 
-    #else // !ENABLE(LLINT_C_LOOP)
+#else // ENABLE(JIT)
+    llint_entry(&Data::s_opcodeMap);
+
     for (int i = 0; i < maxOpcodeLength + 1; ++i)
         Data::s_exceptionInstructions[i].u.pointer =
             LLInt::getCodePtr(llint_throw_from_slow_path_trampoline);
-    #define OPCODE_ENTRY(opcode, length) \
-        Data::s_opcodeMap[opcode] = LLInt::getCodePtr(llint_##opcode);
-    FOR_EACH_OPCODE_ID(OPCODE_ENTRY);
-    #undef OPCODE_ENTRY
-    #endif // !ENABLE(LLINT_C_LOOP)
+#endif // ENABLE(JIT)
+
+#if ENABLE(LLINT_STATS)
+    Data::ensureStats();
+#endif
 }
 
 #if COMPILER(CLANG)
@@ -71,31 +86,29 @@ void Data::performAssertions(VM& vm)
     // Assertions to match LowLevelInterpreter.asm.  If you change any of this code, be
     // prepared to change LowLevelInterpreter.asm as well!!
 
-#ifndef NDEBUG
 #if USE(JSVALUE64)
     const ptrdiff_t PtrSize = 8;
-    const ptrdiff_t CallFrameHeaderSlots = 6;
+    const ptrdiff_t CallFrameHeaderSlots = 5;
 #else // USE(JSVALUE64) // i.e. 32-bit version
     const ptrdiff_t PtrSize = 4;
-    const ptrdiff_t CallFrameHeaderSlots = 5;
+    const ptrdiff_t CallFrameHeaderSlots = 4;
 #endif
     const ptrdiff_t SlotSize = 8;
-#endif
 
-    ASSERT(sizeof(void*) == PtrSize);
-    ASSERT(sizeof(Register) == SlotSize);
-    ASSERT(JSStack::CallFrameHeaderSize == CallFrameHeaderSlots);
+    STATIC_ASSERT(sizeof(void*) == PtrSize);
+    STATIC_ASSERT(sizeof(Register) == SlotSize);
+    STATIC_ASSERT(CallFrame::headerSizeInRegisters == CallFrameHeaderSlots);
 
     ASSERT(!CallFrame::callerFrameOffset());
+    STATIC_ASSERT(CallerFrameAndPC::sizeInRegisters == (PtrSize * 2) / SlotSize);
     ASSERT(CallFrame::returnPCOffset() == CallFrame::callerFrameOffset() + PtrSize);
-    ASSERT(JSStack::CodeBlock * sizeof(Register) == CallFrame::returnPCOffset() + PtrSize);
-    ASSERT(JSStack::ScopeChain * sizeof(Register) == JSStack::CodeBlock * sizeof(Register) + SlotSize);
-    ASSERT(JSStack::Callee * sizeof(Register) == JSStack::ScopeChain * sizeof(Register) + SlotSize);
-    ASSERT(JSStack::ArgumentCount * sizeof(Register) == JSStack::Callee * sizeof(Register) + SlotSize);
-    ASSERT(JSStack::ThisArgument * sizeof(Register) == JSStack::ArgumentCount * sizeof(Register) + SlotSize);
-    ASSERT(JSStack::CallFrameHeaderSize == JSStack::ThisArgument);
+    ASSERT(CallFrameSlot::codeBlock * sizeof(Register) == CallFrame::returnPCOffset() + PtrSize);
+    STATIC_ASSERT(CallFrameSlot::callee * sizeof(Register) == CallFrameSlot::codeBlock * sizeof(Register) + SlotSize);
+    STATIC_ASSERT(CallFrameSlot::argumentCount * sizeof(Register) == CallFrameSlot::callee * sizeof(Register) + SlotSize);
+    STATIC_ASSERT(CallFrameSlot::thisArgument * sizeof(Register) == CallFrameSlot::argumentCount * sizeof(Register) + SlotSize);
+    STATIC_ASSERT(CallFrame::headerSizeInRegisters == CallFrameSlot::thisArgument);
 
-    ASSERT(CallFrame::argumentOffsetIncludingThis(0) == JSStack::ThisArgument);
+    ASSERT(CallFrame::argumentOffsetIncludingThis(0) == CallFrameSlot::thisArgument);
 
 #if CPU(BIG_ENDIAN)
     ASSERT(OBJECT_OFFSETOF(EncodedValueDescriptor, asBits.tag) == 0);
@@ -105,46 +118,114 @@ void Data::performAssertions(VM& vm)
     ASSERT(OBJECT_OFFSETOF(EncodedValueDescriptor, asBits.payload) == 0);
 #endif
 #if USE(JSVALUE32_64)
-    ASSERT(JSValue::Int32Tag == static_cast<unsigned>(-1));
-    ASSERT(JSValue::BooleanTag == static_cast<unsigned>(-2));
-    ASSERT(JSValue::NullTag == static_cast<unsigned>(-3));
-    ASSERT(JSValue::UndefinedTag == static_cast<unsigned>(-4));
-    ASSERT(JSValue::CellTag == static_cast<unsigned>(-5));
-    ASSERT(JSValue::EmptyValueTag == static_cast<unsigned>(-6));
-    ASSERT(JSValue::DeletedValueTag == static_cast<unsigned>(-7));
-    ASSERT(JSValue::LowestTag == static_cast<unsigned>(-7));
+    STATIC_ASSERT(JSValue::Int32Tag == static_cast<unsigned>(-1));
+    STATIC_ASSERT(JSValue::BooleanTag == static_cast<unsigned>(-2));
+    STATIC_ASSERT(JSValue::NullTag == static_cast<unsigned>(-3));
+    STATIC_ASSERT(JSValue::UndefinedTag == static_cast<unsigned>(-4));
+    STATIC_ASSERT(JSValue::CellTag == static_cast<unsigned>(-5));
+    STATIC_ASSERT(JSValue::EmptyValueTag == static_cast<unsigned>(-6));
+    STATIC_ASSERT(JSValue::DeletedValueTag == static_cast<unsigned>(-7));
+    STATIC_ASSERT(JSValue::LowestTag == static_cast<unsigned>(-7));
 #else
-    ASSERT(TagBitTypeOther == 0x2);
-    ASSERT(TagBitBool == 0x4);
-    ASSERT(TagBitUndefined == 0x8);
-    ASSERT(ValueEmpty == 0x0);
-    ASSERT(ValueFalse == (TagBitTypeOther | TagBitBool));
-    ASSERT(ValueTrue == (TagBitTypeOther | TagBitBool | 1));
-    ASSERT(ValueUndefined == (TagBitTypeOther | TagBitUndefined));
-    ASSERT(ValueNull == TagBitTypeOther);
+    STATIC_ASSERT(TagBitTypeOther == 0x2);
+    STATIC_ASSERT(TagBitBool == 0x4);
+    STATIC_ASSERT(TagBitUndefined == 0x8);
+    STATIC_ASSERT(ValueEmpty == 0x0);
+    STATIC_ASSERT(ValueFalse == (TagBitTypeOther | TagBitBool));
+    STATIC_ASSERT(ValueTrue == (TagBitTypeOther | TagBitBool | 1));
+    STATIC_ASSERT(ValueUndefined == (TagBitTypeOther | TagBitUndefined));
+    STATIC_ASSERT(ValueNull == TagBitTypeOther);
+#endif
+#if (CPU(X86_64) && !OS(WINDOWS)) || CPU(ARM64) || !ENABLE(JIT)
+    STATIC_ASSERT(!maxFrameExtentForSlowPathCall);
+#elif CPU(ARM)
+    STATIC_ASSERT(maxFrameExtentForSlowPathCall == 24);
+#elif CPU(X86) || CPU(MIPS)
+    STATIC_ASSERT(maxFrameExtentForSlowPathCall == 40);
+#elif CPU(X86_64) && OS(WINDOWS)
+    STATIC_ASSERT(maxFrameExtentForSlowPathCall == 64);
+#endif
+
+#if !ENABLE(JIT) || USE(JSVALUE32_64)
+    ASSERT(!CodeBlock::llintBaselineCalleeSaveSpaceAsVirtualRegisters());
+#elif (CPU(X86_64) && !OS(WINDOWS))  || CPU(ARM64)
+    ASSERT(CodeBlock::llintBaselineCalleeSaveSpaceAsVirtualRegisters() == 3);
+#elif (CPU(X86_64) && OS(WINDOWS))
+    ASSERT(CodeBlock::llintBaselineCalleeSaveSpaceAsVirtualRegisters() == 3);
 #endif
-    ASSERT(StringType == 5);
-    ASSERT(ObjectType == 17);
-    ASSERT(FinalObjectType == 18);
-    ASSERT(MasqueradesAsUndefined == 1);
-    ASSERT(ImplementsHasInstance == 2);
-    ASSERT(ImplementsDefaultHasInstance == 8);
-    ASSERT(FirstConstantRegisterIndex == 0x40000000);
-    ASSERT(GlobalCode == 0);
-    ASSERT(EvalCode == 1);
-    ASSERT(FunctionCode == 2);
-
-    ASSERT(GlobalProperty == 0);
-    ASSERT(GlobalVar == 1);
-    ASSERT(ClosureVar == 2);
-    ASSERT(GlobalPropertyWithVarInjectionChecks == 3);
-    ASSERT(GlobalVarWithVarInjectionChecks == 4);
-    ASSERT(ClosureVarWithVarInjectionChecks == 5);
-    ASSERT(Dynamic == 6);
     
-    ASSERT(ResolveModeAndType::mask == 0xffff);
+    STATIC_ASSERT(StringType == 6);
+    STATIC_ASSERT(SymbolType == 7);
+    STATIC_ASSERT(ObjectType == 23);
+    STATIC_ASSERT(FinalObjectType == 24);
+    STATIC_ASSERT(JSFunctionType == 26);
+    STATIC_ASSERT(ArrayType == 34);
+    STATIC_ASSERT(DerivedArrayType == 35);
+    STATIC_ASSERT(ProxyObjectType == 53);
+    STATIC_ASSERT(Int8ArrayType == 36);
+    STATIC_ASSERT(Int16ArrayType == 37);
+    STATIC_ASSERT(Int32ArrayType == 38);
+    STATIC_ASSERT(Uint8ArrayType == 39);
+    STATIC_ASSERT(Uint8ClampedArrayType == 40);
+    STATIC_ASSERT(Uint16ArrayType == 41);
+    STATIC_ASSERT(Uint32ArrayType == 42);
+    STATIC_ASSERT(Float32ArrayType == 43);
+    STATIC_ASSERT(Float64ArrayType == 44);
+    STATIC_ASSERT(MasqueradesAsUndefined == 1);
+    STATIC_ASSERT(ImplementsDefaultHasInstance == 2);
+    STATIC_ASSERT(FirstConstantRegisterIndex == 0x40000000);
+    STATIC_ASSERT(GlobalCode == 0);
+    STATIC_ASSERT(EvalCode == 1);
+    STATIC_ASSERT(FunctionCode == 2);
+    STATIC_ASSERT(ModuleCode == 3);
+    
+    STATIC_ASSERT(IsArray == 0x01);
+    STATIC_ASSERT(IndexingShapeMask == 0x0E);
+    STATIC_ASSERT(NoIndexingShape == 0x00);
+    STATIC_ASSERT(Int32Shape == 0x04);
+    STATIC_ASSERT(DoubleShape == 0x06);
+    STATIC_ASSERT(ContiguousShape == 0x08);
+    STATIC_ASSERT(ArrayStorageShape == 0x0A);
+    STATIC_ASSERT(SlowPutArrayStorageShape == 0x0C);
 
-    ASSERT(MarkedBlock::blockMask == ~static_cast<decltype(MarkedBlock::blockMask)>(0xffff));
+    ASSERT(!(reinterpret_cast<ptrdiff_t>((reinterpret_cast<WriteBarrier<JSCell>*>(0x4000)->slot())) - 0x4000));
+    static_assert(PutByIdPrimaryTypeMask == 0x6, "LLInt assumes PutByIdPrimaryTypeMask is == 0x6");
+    static_assert(PutByIdPrimaryTypeSecondary == 0x0, "LLInt assumes PutByIdPrimaryTypeSecondary is == 0x0");
+    static_assert(PutByIdPrimaryTypeObjectWithStructure == 0x2, "LLInt assumes PutByIdPrimaryTypeObjectWithStructure is == 0x2");
+    static_assert(PutByIdPrimaryTypeObjectWithStructureOrOther == 0x4, "LLInt assumes PutByIdPrimaryTypeObjectWithStructureOrOther is == 0x4");
+    static_assert(PutByIdSecondaryTypeMask == -0x8, "LLInt assumes PutByIdSecondaryTypeMask is == -0x8");
+    static_assert(PutByIdSecondaryTypeBottom == 0x0, "LLInt assumes PutByIdSecondaryTypeBottom is == 0x0");
+    static_assert(PutByIdSecondaryTypeBoolean == 0x8, "LLInt assumes PutByIdSecondaryTypeBoolean is == 0x8");
+    static_assert(PutByIdSecondaryTypeOther == 0x10, "LLInt assumes PutByIdSecondaryTypeOther is == 0x10");
+    static_assert(PutByIdSecondaryTypeInt32 == 0x18, "LLInt assumes PutByIdSecondaryTypeInt32 is == 0x18");
+    static_assert(PutByIdSecondaryTypeNumber == 0x20, "LLInt assumes PutByIdSecondaryTypeNumber is == 0x20");
+    static_assert(PutByIdSecondaryTypeString == 0x28, "LLInt assumes PutByIdSecondaryTypeString is == 0x28");
+    static_assert(PutByIdSecondaryTypeSymbol == 0x30, "LLInt assumes PutByIdSecondaryTypeSymbol is == 0x30");
+    static_assert(PutByIdSecondaryTypeObject == 0x38, "LLInt assumes PutByIdSecondaryTypeObject is == 0x38");
+    static_assert(PutByIdSecondaryTypeObjectOrOther == 0x40, "LLInt assumes PutByIdSecondaryTypeObjectOrOther is == 0x40");
+    static_assert(PutByIdSecondaryTypeTop == 0x48, "LLInt assumes PutByIdSecondaryTypeTop is == 0x48");
+
+    static_assert(GlobalProperty == 0, "LLInt assumes GlobalProperty ResultType is == 0");
+    static_assert(GlobalVar == 1, "LLInt assumes GlobalVar ResultType is == 1");
+    static_assert(GlobalLexicalVar == 2, "LLInt assumes GlobalLexicalVar ResultType is == 2");
+    static_assert(ClosureVar == 3, "LLInt assumes ClosureVar ResultType is == 3");
+    static_assert(LocalClosureVar == 4, "LLInt assumes LocalClosureVar ResultType is == 4");
+    static_assert(ModuleVar == 5, "LLInt assumes ModuleVar ResultType is == 5");
+    static_assert(GlobalPropertyWithVarInjectionChecks == 6, "LLInt assumes GlobalPropertyWithVarInjectionChecks ResultType is == 6");
+    static_assert(GlobalVarWithVarInjectionChecks == 7, "LLInt assumes GlobalVarWithVarInjectionChecks ResultType is == 7");
+    static_assert(GlobalLexicalVarWithVarInjectionChecks == 8, "LLInt assumes GlobalLexicalVarWithVarInjectionChecks ResultType is == 8");
+    static_assert(ClosureVarWithVarInjectionChecks == 9, "LLInt assumes ClosureVarWithVarInjectionChecks ResultType is == 9");
+
+    static_assert(static_cast<unsigned>(InitializationMode::NotInitialization) == 2, "LLInt assumes that InitializationMode::NotInitialization is 0");
+    
+    STATIC_ASSERT(GetPutInfo::typeBits == 0x3ff);
+    STATIC_ASSERT(GetPutInfo::initializationShift == 10);
+    STATIC_ASSERT(GetPutInfo::initializationBits == 0xffc00);
+
+    STATIC_ASSERT(MarkedBlock::blockSize == 16 * 1024);
+    STATIC_ASSERT(blackThreshold == 0);
+
+    ASSERT(bitwise_cast<uintptr_t>(ShadowChicken::Packet::tailMarker()) == static_cast<uintptr_t>(0x7a11));
 
     // FIXME: make these assertions less horrible.
 #if !ASSERT_DISABLED
@@ -154,12 +235,183 @@ void Data::performAssertions(VM& vm)
     ASSERT(bitwise_cast<int**>(&testVector)[0] == testVector.begin());
 #endif
 
-    ASSERT(StringImpl::s_hashFlag8BitBuffer == 32);
+    ASSERT(StringImpl::s_hashFlag8BitBuffer == 8);
+
+    {
+        uint32_t bits = 0x120000;
+        UNUSED_PARAM(bits);
+        ArithProfile arithProfile;
+        arithProfile.lhsSawInt32();
+        arithProfile.rhsSawInt32();
+        ASSERT(arithProfile.bits() == bits);
+        ASSERT(ArithProfile::fromInt(bits).lhsObservedType().isOnlyInt32());
+        ASSERT(ArithProfile::fromInt(bits).rhsObservedType().isOnlyInt32());
+    }
+    {
+        uint32_t bits = 0x220000;
+        UNUSED_PARAM(bits);
+        ArithProfile arithProfile;
+        arithProfile.lhsSawNumber();
+        arithProfile.rhsSawInt32();
+        ASSERT(arithProfile.bits() == bits);
+        ASSERT(ArithProfile::fromInt(bits).lhsObservedType().isOnlyNumber());
+        ASSERT(ArithProfile::fromInt(bits).rhsObservedType().isOnlyInt32());
+    }
+    {
+        uint32_t bits = 0x240000;
+        UNUSED_PARAM(bits);
+        ArithProfile arithProfile;
+        arithProfile.lhsSawNumber();
+        arithProfile.rhsSawNumber();
+        ASSERT(arithProfile.bits() == bits);
+        ASSERT(ArithProfile::fromInt(bits).lhsObservedType().isOnlyNumber());
+        ASSERT(ArithProfile::fromInt(bits).rhsObservedType().isOnlyNumber());
+    }
+    {
+        uint32_t bits = 0x140000;
+        UNUSED_PARAM(bits);
+        ArithProfile arithProfile;
+        arithProfile.lhsSawInt32();
+        arithProfile.rhsSawNumber();
+        ASSERT(arithProfile.bits() == bits);
+        ASSERT(ArithProfile::fromInt(bits).lhsObservedType().isOnlyInt32());
+        ASSERT(ArithProfile::fromInt(bits).rhsObservedType().isOnlyNumber());
+    }
 }
 #if COMPILER(CLANG)
 #pragma clang diagnostic pop
 #endif
 
-} } // namespace JSC::LLInt
+void Data::finalizeStats()
+{
+#if ENABLE(LLINT_STATS)
+    if (!Options::reportLLIntStats())
+        return;
+    
+    if (Options::llintStatsFile())
+        saveStats();
+    
+    dumpStats();
+#endif
+}
+
+#if ENABLE(LLINT_STATS)
+static const bool verboseStats = false;
+
+static bool compareStats(const OpcodeStats& a, const OpcodeStats& b)
+{
+    if (a.count > b.count)
+        return true;
+    if (a.count < b.count)
+        return false;
+    return a.slowPathCount > b.slowPathCount;
+}
+
+void Data::dumpStats()
+{
+    ASSERT(Options::reportLLIntStats());
+    auto statsCopy = *s_opcodeStatsArray;
+    std::sort(statsCopy.begin(), statsCopy.end(), compareStats);
+
+    dataLog("Opcode stats:\n");
+    unsigned i = 0;
+    for (auto& stats : statsCopy) {
+        if (stats.count || stats.slowPathCount)
+            dataLog("   [", i++, "]: fast:", stats.count, " slow:", stats.slowPathCount, " ", opcodeNames[stats.id], "\n");
+    }
+}
+
+void Data::ensureStats()
+{
+    static std::once_flag initializeOptionsOnceFlag;
+    std::call_once(initializeOptionsOnceFlag, [] {
+        s_opcodeStatsArray = new OpcodeStatsArray();
+        resetStats();
+    });
+}
+
+void Data::loadStats()
+{
+    static NeverDestroyed<std::string> installedStatsFile;
+    if (!Options::llintStatsFile() || !installedStatsFile.get().compare(Options::llintStatsFile()))
+        return;
 
-#endif // ENABLE(LLINT)
+    Options::reportLLIntStats() = true; // Force stats collection.
+    installedStatsFile.get() = Options::llintStatsFile();
+
+    ensureStats();
+
+    const char* filename = Options::llintStatsFile();
+    FILE* file = fopen(filename, "r");
+    if (!file) {
+        dataLogF("Failed to open file %s. Did you add the file-read-write-data entitlement to WebProcess.sb?\n", filename);
+        return;
+    }
+
+    resetStats();
+
+    OpcodeStats loaded;
+    unsigned index;
+    char opcodeName[100];
+    while (fscanf(file, "[%u]: fast:%zu slow:%zu id:%u %s\n", &index, &loaded.count, &loaded.slowPathCount, &loaded.id, opcodeName) != EOF) {
+        if (verboseStats)
+            dataLogF("loaded [%u]: fast %zu slow %zu id:%u %s\n", index, loaded.count, loaded.slowPathCount, loaded.id, opcodeName);
+
+        OpcodeStats& stats = opcodeStats(loaded.id);
+        stats.count = loaded.count;
+        stats.slowPathCount = loaded.slowPathCount;
+    }
+
+    if (verboseStats) {
+        dataLogF("After loading from %s, ", filename);
+        dumpStats();
+    }
+
+    int result = fclose(file);
+    if (result)
+        dataLogF("Failed to close file %s: %s\n", filename, strerror(errno));
+}
+
+void Data::resetStats()
+{
+    unsigned i = 0;
+    for (auto& stats : *s_opcodeStatsArray) {
+        stats.id = static_cast<OpcodeID>(i++);
+        stats.count = 0;
+        stats.slowPathCount = 0;
+    }
+}
+
+void Data::saveStats()
+{
+    ASSERT(Options::reportLLIntStats() && Options::llintStatsFile());
+    const char* filename = Options::llintStatsFile();
+
+    FILE* file = fopen(filename, "w");
+    if (!file) {
+        dataLogF("Failed to open file %s. Did you add the file-read-write-data entitlement to WebProcess.sb?\n", filename);
+        return;
+    }
+
+    auto statsCopy = *s_opcodeStatsArray;
+    std::sort(statsCopy.begin(), statsCopy.end(), compareStats);
+
+    int index = 0;
+    for (auto& stats : statsCopy) {
+        if (!stats.count && !stats.slowPathCount)
+            break; // stats are sorted. If we encountered 0 counts, then there are no more non-zero counts.
+
+        if (verboseStats)
+            dataLogF("saved [%u]: fast:%zu slow:%zu id:%u %s\n", index, stats.count, stats.slowPathCount, stats.id, opcodeNames[stats.id]);
+
+        fprintf(file, "[%u]: fast:%zu slow:%zu id:%u %s\n", index, stats.count, stats.slowPathCount, stats.id, opcodeNames[stats.id]);
+        index++;
+    }
+
+    int result = fclose(file);
+    if (result)
+        dataLogF("Failed to close file %s: %s\n", filename, strerror(errno));
+}
+#endif
+
+} } // namespace JSC::LLInt