JavaScriptCore-7600.1.4.9.tar.gz

[apple/javascriptcore.git] / jit / JITInlineCacheGenerator.cpp

diff --git a/jit/JITInlineCacheGenerator.cpp b/jit/JITInlineCacheGenerator.cpp
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+/*
+ * Copyright (C) 2013 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. 
+ */
+
+#include "config.h"
+#include "JITInlineCacheGenerator.h"
+
+#if ENABLE(JIT)
+
+#include "CodeBlock.h"
+#include "LinkBuffer.h"
+#include "JSCInlines.h"
+
+namespace JSC {
+
+static StructureStubInfo* garbageStubInfo()
+{
+    static StructureStubInfo* stubInfo = new StructureStubInfo();
+    return stubInfo;
+}
+
+JITInlineCacheGenerator::JITInlineCacheGenerator(CodeBlock* codeBlock, CodeOrigin codeOrigin)
+    : m_codeBlock(codeBlock)
+{
+    m_stubInfo = m_codeBlock ? m_codeBlock->addStubInfo() : garbageStubInfo();
+    m_stubInfo->codeOrigin = codeOrigin;
+}
+
+JITByIdGenerator::JITByIdGenerator(
+    CodeBlock* codeBlock, CodeOrigin codeOrigin, const RegisterSet& usedRegisters,
+    JSValueRegs base, JSValueRegs value, SpillRegistersMode spillMode)
+    : JITInlineCacheGenerator(codeBlock, codeOrigin)
+    , m_base(base)
+    , m_value(value)
+{
+    m_stubInfo->patch.spillMode = spillMode;
+    m_stubInfo->patch.usedRegisters = usedRegisters;
+    
+    // This is a convenience - in cases where the only registers you're using are base/value,
+    // it allows you to pass RegisterSet() as the usedRegisters argument.
+    m_stubInfo->patch.usedRegisters.set(base);
+    m_stubInfo->patch.usedRegisters.set(value);
+    
+    m_stubInfo->patch.baseGPR = static_cast<int8_t>(base.payloadGPR());
+    m_stubInfo->patch.valueGPR = static_cast<int8_t>(value.payloadGPR());
+#if USE(JSVALUE32_64)
+    m_stubInfo->patch.valueTagGPR = static_cast<int8_t>(value.tagGPR());
+#endif
+}
+
+void JITByIdGenerator::finalize(LinkBuffer& fastPath, LinkBuffer& slowPath)
+{
+    CodeLocationCall callReturnLocation = slowPath.locationOf(m_call);
+    m_stubInfo->callReturnLocation = callReturnLocation;
+    m_stubInfo->patch.deltaCheckImmToCall = MacroAssembler::differenceBetweenCodePtr(
+        fastPath.locationOf(m_structureImm), callReturnLocation);
+    m_stubInfo->patch.deltaCallToJump = MacroAssembler::differenceBetweenCodePtr(
+        callReturnLocation, fastPath.locationOf(m_structureCheck));
+#if USE(JSVALUE64)
+    m_stubInfo->patch.deltaCallToLoadOrStore = MacroAssembler::differenceBetweenCodePtr(
+        callReturnLocation, fastPath.locationOf(m_loadOrStore));
+#else
+    m_stubInfo->patch.deltaCallToTagLoadOrStore = MacroAssembler::differenceBetweenCodePtr(
+        callReturnLocation, fastPath.locationOf(m_tagLoadOrStore));
+    m_stubInfo->patch.deltaCallToPayloadLoadOrStore = MacroAssembler::differenceBetweenCodePtr(
+        callReturnLocation, fastPath.locationOf(m_loadOrStore));
+#endif
+    m_stubInfo->patch.deltaCallToSlowCase = MacroAssembler::differenceBetweenCodePtr(
+        callReturnLocation, slowPath.locationOf(m_slowPathBegin));
+    m_stubInfo->patch.deltaCallToDone = MacroAssembler::differenceBetweenCodePtr(
+        callReturnLocation, fastPath.locationOf(m_done));
+    m_stubInfo->patch.deltaCallToStorageLoad = MacroAssembler::differenceBetweenCodePtr(
+        callReturnLocation, fastPath.locationOf(m_propertyStorageLoad));
+}
+
+void JITByIdGenerator::finalize(LinkBuffer& linkBuffer)
+{
+    finalize(linkBuffer, linkBuffer);
+}
+
+void JITByIdGenerator::generateFastPathChecks(MacroAssembler& jit, GPRReg butterfly)
+{
+    m_structureCheck = jit.patchableBranch32WithPatch(
+        MacroAssembler::NotEqual,
+        MacroAssembler::Address(m_base.payloadGPR(), JSCell::structureIDOffset()),
+        m_structureImm, MacroAssembler::TrustedImm32(0));
+    
+    m_propertyStorageLoad = jit.convertibleLoadPtr(
+        MacroAssembler::Address(m_base.payloadGPR(), JSObject::butterflyOffset()), butterfly);
+}
+
+JITGetByIdGenerator::JITGetByIdGenerator(
+    CodeBlock* codeBlock, CodeOrigin codeOrigin, const RegisterSet& usedRegisters,
+    JSValueRegs base, JSValueRegs value, SpillRegistersMode spillMode)
+    : JITByIdGenerator(codeBlock, codeOrigin, usedRegisters, base, value, spillMode)
+{
+    RELEASE_ASSERT(base.payloadGPR() != value.tagGPR());
+}
+
+void JITGetByIdGenerator::generateFastPath(MacroAssembler& jit)
+{
+    generateFastPathChecks(jit, m_value.payloadGPR());
+    
+#if USE(JSVALUE64)
+    m_loadOrStore = jit.load64WithCompactAddressOffsetPatch(
+        MacroAssembler::Address(m_value.payloadGPR(), 0), m_value.payloadGPR()).label();
+#else
+    m_tagLoadOrStore = jit.load32WithCompactAddressOffsetPatch(
+        MacroAssembler::Address(m_value.payloadGPR(), 0), m_value.tagGPR()).label();
+    m_loadOrStore = jit.load32WithCompactAddressOffsetPatch(
+        MacroAssembler::Address(m_value.payloadGPR(), 0), m_value.payloadGPR()).label();
+#endif
+    
+    m_done = jit.label();
+}
+
+JITPutByIdGenerator::JITPutByIdGenerator(
+    CodeBlock* codeBlock, CodeOrigin codeOrigin, const RegisterSet& usedRegisters,
+    JSValueRegs base, JSValueRegs value, GPRReg scratch, SpillRegistersMode spillMode,
+    ECMAMode ecmaMode, PutKind putKind)
+    : JITByIdGenerator(codeBlock, codeOrigin, usedRegisters, base, value, spillMode)
+    , m_scratch(scratch)
+    , m_ecmaMode(ecmaMode)
+    , m_putKind(putKind)
+{
+    m_stubInfo->patch.usedRegisters.clear(scratch);
+}
+
+void JITPutByIdGenerator::generateFastPath(MacroAssembler& jit)
+{
+    generateFastPathChecks(jit, m_scratch);
+    
+#if USE(JSVALUE64)
+    m_loadOrStore = jit.store64WithAddressOffsetPatch(
+        m_value.payloadGPR(), MacroAssembler::Address(m_scratch, 0)).label();
+#else
+    m_tagLoadOrStore = jit.store32WithAddressOffsetPatch(
+        m_value.tagGPR(), MacroAssembler::Address(m_scratch, 0)).label();
+    m_loadOrStore = jit.store32WithAddressOffsetPatch(
+        m_value.payloadGPR(), MacroAssembler::Address(m_scratch, 0)).label();
+#endif
+    
+    m_done = jit.label();
+}
+
+V_JITOperation_ESsiJJI JITPutByIdGenerator::slowPathFunction()
+{
+    if (m_ecmaMode == StrictMode) {
+        if (m_putKind == Direct)
+            return operationPutByIdDirectStrictOptimize;
+        return operationPutByIdStrictOptimize;
+    }
+    if (m_putKind == Direct)
+        return operationPutByIdDirectNonStrictOptimize;
+    return operationPutByIdNonStrictOptimize;
+}
+
+} // namespace JSC
+
+#endif // ENABLE(JIT)
+