JavaScriptCore-7601.1.46.3.tar.gz

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

diff --git a/jit/SetupVarargsFrame.cpp b/jit/SetupVarargsFrame.cpp
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+/*
+ * Copyright (C) 2015 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 "SetupVarargsFrame.h"
+
+#if ENABLE(JIT)
+
+#include "Interpreter.h"
+#include "JSCInlines.h"
+#include "StackAlignment.h"
+
+namespace JSC {
+
+void emitSetVarargsFrame(CCallHelpers& jit, GPRReg lengthGPR, bool lengthIncludesThis, GPRReg numUsedSlotsGPR, GPRReg resultGPR)
+{
+    jit.move(numUsedSlotsGPR, resultGPR);
+    jit.addPtr(lengthGPR, resultGPR);
+    jit.addPtr(CCallHelpers::TrustedImm32(JSStack::CallFrameHeaderSize + (lengthIncludesThis? 0 : 1)), resultGPR);
+    
+    // resultGPR now has the required frame size in Register units
+    // Round resultGPR to next multiple of stackAlignmentRegisters()
+    jit.addPtr(CCallHelpers::TrustedImm32(stackAlignmentRegisters() - 1), resultGPR);
+    jit.andPtr(CCallHelpers::TrustedImm32(~(stackAlignmentRegisters() - 1)), resultGPR);
+    
+    // Now resultGPR has the right stack frame offset in Register units.
+    jit.negPtr(resultGPR);
+    jit.lshiftPtr(CCallHelpers::Imm32(3), resultGPR);
+    jit.addPtr(GPRInfo::callFrameRegister, resultGPR);
+}
+
+void emitSetupVarargsFrameFastCase(CCallHelpers& jit, GPRReg numUsedSlotsGPR, GPRReg scratchGPR1, GPRReg scratchGPR2, GPRReg scratchGPR3, ValueRecovery argCountRecovery, VirtualRegister firstArgumentReg, unsigned firstVarArgOffset, CCallHelpers::JumpList& slowCase)
+{
+    CCallHelpers::JumpList end;
+    
+    if (argCountRecovery.isConstant()) {
+        // FIXME: We could constant-fold a lot of the computation below in this case.
+        // https://bugs.webkit.org/show_bug.cgi?id=141486
+        jit.move(CCallHelpers::TrustedImm32(argCountRecovery.constant().asInt32()), scratchGPR1);
+    } else
+        jit.load32(CCallHelpers::payloadFor(argCountRecovery.virtualRegister()), scratchGPR1);
+    if (firstVarArgOffset) {
+        CCallHelpers::Jump sufficientArguments = jit.branch32(CCallHelpers::GreaterThan, scratchGPR1, CCallHelpers::TrustedImm32(firstVarArgOffset + 1));
+        jit.move(CCallHelpers::TrustedImm32(1), scratchGPR1);
+        CCallHelpers::Jump endVarArgs = jit.jump();
+        sufficientArguments.link(&jit);
+        jit.sub32(CCallHelpers::TrustedImm32(firstVarArgOffset), scratchGPR1);
+        endVarArgs.link(&jit);
+    }
+    slowCase.append(jit.branch32(CCallHelpers::Above, scratchGPR1, CCallHelpers::TrustedImm32(maxArguments + 1)));
+    
+    emitSetVarargsFrame(jit, scratchGPR1, true, numUsedSlotsGPR, scratchGPR2);
+
+    slowCase.append(jit.branchPtr(CCallHelpers::Above, CCallHelpers::AbsoluteAddress(jit.vm()->addressOfStackLimit()), scratchGPR2));
+
+    // Initialize ArgumentCount.
+    jit.store32(scratchGPR1, CCallHelpers::Address(scratchGPR2, JSStack::ArgumentCount * static_cast<int>(sizeof(Register)) + PayloadOffset));
+
+    // Copy arguments.
+    jit.signExtend32ToPtr(scratchGPR1, scratchGPR1);
+    CCallHelpers::Jump done = jit.branchSubPtr(CCallHelpers::Zero, CCallHelpers::TrustedImm32(1), scratchGPR1);
+    // scratchGPR1: argumentCount
+
+    CCallHelpers::Label copyLoop = jit.label();
+    int argOffset = (firstArgumentReg.offset() - 1 + firstVarArgOffset) * static_cast<int>(sizeof(Register));
+#if USE(JSVALUE64)
+    jit.load64(CCallHelpers::BaseIndex(GPRInfo::callFrameRegister, scratchGPR1, CCallHelpers::TimesEight, argOffset), scratchGPR3);
+    jit.store64(scratchGPR3, CCallHelpers::BaseIndex(scratchGPR2, scratchGPR1, CCallHelpers::TimesEight, CallFrame::thisArgumentOffset() * static_cast<int>(sizeof(Register))));
+#else // USE(JSVALUE64), so this begins the 32-bit case
+    jit.load32(CCallHelpers::BaseIndex(GPRInfo::callFrameRegister, scratchGPR1, CCallHelpers::TimesEight, argOffset + TagOffset), scratchGPR3);
+    jit.store32(scratchGPR3, CCallHelpers::BaseIndex(scratchGPR2, scratchGPR1, CCallHelpers::TimesEight, CallFrame::thisArgumentOffset() * static_cast<int>(sizeof(Register)) + TagOffset));
+    jit.load32(CCallHelpers::BaseIndex(GPRInfo::callFrameRegister, scratchGPR1, CCallHelpers::TimesEight, argOffset + PayloadOffset), scratchGPR3);
+    jit.store32(scratchGPR3, CCallHelpers::BaseIndex(scratchGPR2, scratchGPR1, CCallHelpers::TimesEight, CallFrame::thisArgumentOffset() * static_cast<int>(sizeof(Register)) + PayloadOffset));
+#endif // USE(JSVALUE64), end of 32-bit case
+    jit.branchSubPtr(CCallHelpers::NonZero, CCallHelpers::TrustedImm32(1), scratchGPR1).linkTo(copyLoop, &jit);
+    
+    done.link(&jit);
+}
+
+void emitSetupVarargsFrameFastCase(CCallHelpers& jit, GPRReg numUsedSlotsGPR, GPRReg scratchGPR1, GPRReg scratchGPR2, GPRReg scratchGPR3, unsigned firstVarArgOffset, CCallHelpers::JumpList& slowCase)
+{
+    emitSetupVarargsFrameFastCase(jit, numUsedSlotsGPR, scratchGPR1, scratchGPR2, scratchGPR3, nullptr, firstVarArgOffset, slowCase);
+}
+
+void emitSetupVarargsFrameFastCase(CCallHelpers& jit, GPRReg numUsedSlotsGPR, GPRReg scratchGPR1, GPRReg scratchGPR2, GPRReg scratchGPR3, InlineCallFrame* inlineCallFrame, unsigned firstVarArgOffset, CCallHelpers::JumpList& slowCase)
+{
+    ValueRecovery argumentCountRecovery;
+    VirtualRegister firstArgumentReg;
+    if (inlineCallFrame) {
+        if (inlineCallFrame->isVarargs()) {
+            argumentCountRecovery = ValueRecovery::displacedInJSStack(
+                inlineCallFrame->argumentCountRegister, DataFormatInt32);
+        } else {
+            argumentCountRecovery = ValueRecovery::constant(
+                jsNumber(inlineCallFrame->arguments.size()));
+        }
+        if (inlineCallFrame->arguments.size() > 1)
+            firstArgumentReg = inlineCallFrame->arguments[1].virtualRegister();
+        else
+            firstArgumentReg = VirtualRegister(0);
+    } else {
+        argumentCountRecovery = ValueRecovery::displacedInJSStack(
+            VirtualRegister(JSStack::ArgumentCount), DataFormatInt32);
+        firstArgumentReg = VirtualRegister(CallFrame::argumentOffset(0));
+    }
+    emitSetupVarargsFrameFastCase(jit, numUsedSlotsGPR, scratchGPR1, scratchGPR2, scratchGPR3, argumentCountRecovery, firstArgumentReg, firstVarArgOffset, slowCase);
+}
+
+} // namespace JSC
+
+#endif // ENABLE(JIT)
+