/src/qt/qtwebkit/Source/JavaScriptCore/jit/JITOpcodes.cpp
C++ | 1342 lines | 1017 code | 235 blank | 90 comment | 46 complexity | 49db75672e950348514427b8d17dc716 MD5 | raw file
- /*
- * Copyright (C) 2009, 2012 Apple Inc. All rights reserved.
- * Copyright (C) 2010 Patrick Gansterer <paroga@paroga.com>
- *
- * 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"
- #if ENABLE(JIT)
- #include "JIT.h"
- #include "Arguments.h"
- #include "CopiedSpaceInlines.h"
- #include "Heap.h"
- #include "JITInlines.h"
- #include "JITStubCall.h"
- #include "JSArray.h"
- #include "JSCell.h"
- #include "JSFunction.h"
- #include "JSPropertyNameIterator.h"
- #include "LinkBuffer.h"
- namespace JSC {
- #if USE(JSVALUE64)
- JIT::CodeRef JIT::privateCompileCTINativeCall(VM* vm, NativeFunction)
- {
- return vm->getCTIStub(nativeCallGenerator);
- }
- void JIT::emit_op_mov(Instruction* currentInstruction)
- {
- int dst = currentInstruction[1].u.operand;
- int src = currentInstruction[2].u.operand;
- if (canBeOptimizedOrInlined()) {
- // Use simpler approach, since the DFG thinks that the last result register
- // is always set to the destination on every operation.
- emitGetVirtualRegister(src, regT0);
- emitPutVirtualRegister(dst);
- } else {
- if (m_codeBlock->isConstantRegisterIndex(src)) {
- if (!getConstantOperand(src).isNumber())
- store64(TrustedImm64(JSValue::encode(getConstantOperand(src))), Address(callFrameRegister, dst * sizeof(Register)));
- else
- store64(Imm64(JSValue::encode(getConstantOperand(src))), Address(callFrameRegister, dst * sizeof(Register)));
- if (dst == m_lastResultBytecodeRegister)
- killLastResultRegister();
- } else if ((src == m_lastResultBytecodeRegister) || (dst == m_lastResultBytecodeRegister)) {
- // If either the src or dst is the cached register go though
- // get/put registers to make sure we track this correctly.
- emitGetVirtualRegister(src, regT0);
- emitPutVirtualRegister(dst);
- } else {
- // Perform the copy via regT1; do not disturb any mapping in regT0.
- load64(Address(callFrameRegister, src * sizeof(Register)), regT1);
- store64(regT1, Address(callFrameRegister, dst * sizeof(Register)));
- }
- }
- }
- void JIT::emit_op_end(Instruction* currentInstruction)
- {
- RELEASE_ASSERT(returnValueRegister != callFrameRegister);
- emitGetVirtualRegister(currentInstruction[1].u.operand, returnValueRegister);
- restoreReturnAddressBeforeReturn(Address(callFrameRegister, JSStack::ReturnPC * static_cast<int>(sizeof(Register))));
- ret();
- }
- void JIT::emit_op_jmp(Instruction* currentInstruction)
- {
- unsigned target = currentInstruction[1].u.operand;
- addJump(jump(), target);
- }
- void JIT::emit_op_new_object(Instruction* currentInstruction)
- {
- Structure* structure = currentInstruction[3].u.objectAllocationProfile->structure();
- size_t allocationSize = JSObject::allocationSize(structure->inlineCapacity());
- MarkedAllocator* allocator = &m_vm->heap.allocatorForObjectWithoutDestructor(allocationSize);
- RegisterID resultReg = regT0;
- RegisterID allocatorReg = regT1;
- RegisterID scratchReg = regT2;
- move(TrustedImmPtr(allocator), allocatorReg);
- emitAllocateJSObject(allocatorReg, TrustedImmPtr(structure), resultReg, scratchReg);
- emitPutVirtualRegister(currentInstruction[1].u.operand);
- }
- void JIT::emitSlow_op_new_object(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
- {
- linkSlowCase(iter);
- JITStubCall stubCall(this, cti_op_new_object);
- stubCall.addArgument(TrustedImmPtr(currentInstruction[3].u.objectAllocationProfile->structure()));
- stubCall.call(currentInstruction[1].u.operand);
- }
- void JIT::emit_op_check_has_instance(Instruction* currentInstruction)
- {
- unsigned baseVal = currentInstruction[3].u.operand;
- emitGetVirtualRegister(baseVal, regT0);
- // Check that baseVal is a cell.
- emitJumpSlowCaseIfNotJSCell(regT0, baseVal);
- // Check that baseVal 'ImplementsHasInstance'.
- loadPtr(Address(regT0, JSCell::structureOffset()), regT0);
- addSlowCase(branchTest8(Zero, Address(regT0, Structure::typeInfoFlagsOffset()), TrustedImm32(ImplementsDefaultHasInstance)));
- }
- void JIT::emit_op_instanceof(Instruction* currentInstruction)
- {
- unsigned dst = currentInstruction[1].u.operand;
- unsigned value = currentInstruction[2].u.operand;
- unsigned proto = currentInstruction[3].u.operand;
- // Load the operands (baseVal, proto, and value respectively) into registers.
- // We use regT0 for baseVal since we will be done with this first, and we can then use it for the result.
- emitGetVirtualRegister(value, regT2);
- emitGetVirtualRegister(proto, regT1);
- // Check that proto are cells. baseVal must be a cell - this is checked by op_check_has_instance.
- emitJumpSlowCaseIfNotJSCell(regT2, value);
- emitJumpSlowCaseIfNotJSCell(regT1, proto);
- // Check that prototype is an object
- loadPtr(Address(regT1, JSCell::structureOffset()), regT3);
- addSlowCase(emitJumpIfNotObject(regT3));
-
- // Optimistically load the result true, and start looping.
- // Initially, regT1 still contains proto and regT2 still contains value.
- // As we loop regT2 will be updated with its prototype, recursively walking the prototype chain.
- move(TrustedImm64(JSValue::encode(jsBoolean(true))), regT0);
- Label loop(this);
- // Load the prototype of the object in regT2. If this is equal to regT1 - WIN!
- // Otherwise, check if we've hit null - if we have then drop out of the loop, if not go again.
- loadPtr(Address(regT2, JSCell::structureOffset()), regT2);
- load64(Address(regT2, Structure::prototypeOffset()), regT2);
- Jump isInstance = branchPtr(Equal, regT2, regT1);
- emitJumpIfJSCell(regT2).linkTo(loop, this);
- // We get here either by dropping out of the loop, or if value was not an Object. Result is false.
- move(TrustedImm64(JSValue::encode(jsBoolean(false))), regT0);
- // isInstance jumps right down to here, to skip setting the result to false (it has already set true).
- isInstance.link(this);
- emitPutVirtualRegister(dst);
- }
- void JIT::emit_op_is_undefined(Instruction* currentInstruction)
- {
- unsigned dst = currentInstruction[1].u.operand;
- unsigned value = currentInstruction[2].u.operand;
-
- emitGetVirtualRegister(value, regT0);
- Jump isCell = emitJumpIfJSCell(regT0);
- compare64(Equal, regT0, TrustedImm32(ValueUndefined), regT0);
- Jump done = jump();
-
- isCell.link(this);
- loadPtr(Address(regT0, JSCell::structureOffset()), regT1);
- Jump isMasqueradesAsUndefined = branchTest8(NonZero, Address(regT1, Structure::typeInfoFlagsOffset()), TrustedImm32(MasqueradesAsUndefined));
- move(TrustedImm32(0), regT0);
- Jump notMasqueradesAsUndefined = jump();
- isMasqueradesAsUndefined.link(this);
- move(TrustedImmPtr(m_codeBlock->globalObject()), regT0);
- loadPtr(Address(regT1, Structure::globalObjectOffset()), regT1);
- comparePtr(Equal, regT0, regT1, regT0);
- notMasqueradesAsUndefined.link(this);
- done.link(this);
- emitTagAsBoolImmediate(regT0);
- emitPutVirtualRegister(dst);
- }
- void JIT::emit_op_is_boolean(Instruction* currentInstruction)
- {
- unsigned dst = currentInstruction[1].u.operand;
- unsigned value = currentInstruction[2].u.operand;
-
- emitGetVirtualRegister(value, regT0);
- xor64(TrustedImm32(static_cast<int32_t>(ValueFalse)), regT0);
- test64(Zero, regT0, TrustedImm32(static_cast<int32_t>(~1)), regT0);
- emitTagAsBoolImmediate(regT0);
- emitPutVirtualRegister(dst);
- }
- void JIT::emit_op_is_number(Instruction* currentInstruction)
- {
- unsigned dst = currentInstruction[1].u.operand;
- unsigned value = currentInstruction[2].u.operand;
-
- emitGetVirtualRegister(value, regT0);
- test64(NonZero, regT0, tagTypeNumberRegister, regT0);
- emitTagAsBoolImmediate(regT0);
- emitPutVirtualRegister(dst);
- }
- void JIT::emit_op_is_string(Instruction* currentInstruction)
- {
- unsigned dst = currentInstruction[1].u.operand;
- unsigned value = currentInstruction[2].u.operand;
-
- emitGetVirtualRegister(value, regT0);
- Jump isNotCell = emitJumpIfNotJSCell(regT0);
-
- loadPtr(Address(regT0, JSCell::structureOffset()), regT1);
- compare8(Equal, Address(regT1, Structure::typeInfoTypeOffset()), TrustedImm32(StringType), regT0);
- emitTagAsBoolImmediate(regT0);
- Jump done = jump();
-
- isNotCell.link(this);
- move(TrustedImm32(ValueFalse), regT0);
-
- done.link(this);
- emitPutVirtualRegister(dst);
- }
- void JIT::emit_op_call(Instruction* currentInstruction)
- {
- compileOpCall(op_call, currentInstruction, m_callLinkInfoIndex++);
- }
- void JIT::emit_op_call_eval(Instruction* currentInstruction)
- {
- compileOpCall(op_call_eval, currentInstruction, m_callLinkInfoIndex);
- }
- void JIT::emit_op_call_varargs(Instruction* currentInstruction)
- {
- compileOpCall(op_call_varargs, currentInstruction, m_callLinkInfoIndex++);
- }
- void JIT::emit_op_construct(Instruction* currentInstruction)
- {
- compileOpCall(op_construct, currentInstruction, m_callLinkInfoIndex++);
- }
- void JIT::emit_op_tear_off_activation(Instruction* currentInstruction)
- {
- int activation = currentInstruction[1].u.operand;
- Jump activationNotCreated = branchTest64(Zero, addressFor(activation));
- JITStubCall stubCall(this, cti_op_tear_off_activation);
- stubCall.addArgument(activation, regT2);
- stubCall.call();
- activationNotCreated.link(this);
- }
- void JIT::emit_op_tear_off_arguments(Instruction* currentInstruction)
- {
- int arguments = currentInstruction[1].u.operand;
- int activation = currentInstruction[2].u.operand;
- Jump argsNotCreated = branchTest64(Zero, Address(callFrameRegister, sizeof(Register) * (unmodifiedArgumentsRegister(arguments))));
- JITStubCall stubCall(this, cti_op_tear_off_arguments);
- stubCall.addArgument(unmodifiedArgumentsRegister(arguments), regT2);
- stubCall.addArgument(activation, regT2);
- stubCall.call();
- argsNotCreated.link(this);
- }
- void JIT::emit_op_ret(Instruction* currentInstruction)
- {
- ASSERT(callFrameRegister != regT1);
- ASSERT(regT1 != returnValueRegister);
- ASSERT(returnValueRegister != callFrameRegister);
- // Return the result in %eax.
- emitGetVirtualRegister(currentInstruction[1].u.operand, returnValueRegister);
- // Grab the return address.
- emitGetFromCallFrameHeaderPtr(JSStack::ReturnPC, regT1);
- // Restore our caller's "r".
- emitGetFromCallFrameHeaderPtr(JSStack::CallerFrame, callFrameRegister);
- // Return.
- restoreReturnAddressBeforeReturn(regT1);
- ret();
- }
- void JIT::emit_op_ret_object_or_this(Instruction* currentInstruction)
- {
- ASSERT(callFrameRegister != regT1);
- ASSERT(regT1 != returnValueRegister);
- ASSERT(returnValueRegister != callFrameRegister);
- // Return the result in %eax.
- emitGetVirtualRegister(currentInstruction[1].u.operand, returnValueRegister);
- Jump notJSCell = emitJumpIfNotJSCell(returnValueRegister);
- loadPtr(Address(returnValueRegister, JSCell::structureOffset()), regT2);
- Jump notObject = emitJumpIfNotObject(regT2);
- // Grab the return address.
- emitGetFromCallFrameHeaderPtr(JSStack::ReturnPC, regT1);
- // Restore our caller's "r".
- emitGetFromCallFrameHeaderPtr(JSStack::CallerFrame, callFrameRegister);
- // Return.
- restoreReturnAddressBeforeReturn(regT1);
- ret();
- // Return 'this' in %eax.
- notJSCell.link(this);
- notObject.link(this);
- emitGetVirtualRegister(currentInstruction[2].u.operand, returnValueRegister);
- // Grab the return address.
- emitGetFromCallFrameHeaderPtr(JSStack::ReturnPC, regT1);
- // Restore our caller's "r".
- emitGetFromCallFrameHeaderPtr(JSStack::CallerFrame, callFrameRegister);
- // Return.
- restoreReturnAddressBeforeReturn(regT1);
- ret();
- }
- void JIT::emit_op_to_primitive(Instruction* currentInstruction)
- {
- int dst = currentInstruction[1].u.operand;
- int src = currentInstruction[2].u.operand;
- emitGetVirtualRegister(src, regT0);
-
- Jump isImm = emitJumpIfNotJSCell(regT0);
- addSlowCase(branchPtr(NotEqual, Address(regT0, JSCell::structureOffset()), TrustedImmPtr(m_vm->stringStructure.get())));
- isImm.link(this);
- if (dst != src)
- emitPutVirtualRegister(dst);
- }
- void JIT::emit_op_strcat(Instruction* currentInstruction)
- {
- JITStubCall stubCall(this, cti_op_strcat);
- stubCall.addArgument(TrustedImm32(currentInstruction[2].u.operand));
- stubCall.addArgument(TrustedImm32(currentInstruction[3].u.operand));
- stubCall.call(currentInstruction[1].u.operand);
- }
- void JIT::emit_op_not(Instruction* currentInstruction)
- {
- emitGetVirtualRegister(currentInstruction[2].u.operand, regT0);
- // Invert against JSValue(false); if the value was tagged as a boolean, then all bits will be
- // clear other than the low bit (which will be 0 or 1 for false or true inputs respectively).
- // Then invert against JSValue(true), which will add the tag back in, and flip the low bit.
- xor64(TrustedImm32(static_cast<int32_t>(ValueFalse)), regT0);
- addSlowCase(branchTestPtr(NonZero, regT0, TrustedImm32(static_cast<int32_t>(~1))));
- xor64(TrustedImm32(static_cast<int32_t>(ValueTrue)), regT0);
- emitPutVirtualRegister(currentInstruction[1].u.operand);
- }
- void JIT::emit_op_jfalse(Instruction* currentInstruction)
- {
- unsigned target = currentInstruction[2].u.operand;
- emitGetVirtualRegister(currentInstruction[1].u.operand, regT0);
- addJump(branch64(Equal, regT0, TrustedImm64(JSValue::encode(jsNumber(0)))), target);
- Jump isNonZero = emitJumpIfImmediateInteger(regT0);
- addJump(branch64(Equal, regT0, TrustedImm64(JSValue::encode(jsBoolean(false)))), target);
- addSlowCase(branch64(NotEqual, regT0, TrustedImm64(JSValue::encode(jsBoolean(true)))));
- isNonZero.link(this);
- }
- void JIT::emit_op_jeq_null(Instruction* currentInstruction)
- {
- unsigned src = currentInstruction[1].u.operand;
- unsigned target = currentInstruction[2].u.operand;
- emitGetVirtualRegister(src, regT0);
- Jump isImmediate = emitJumpIfNotJSCell(regT0);
- // First, handle JSCell cases - check MasqueradesAsUndefined bit on the structure.
- loadPtr(Address(regT0, JSCell::structureOffset()), regT2);
- Jump isNotMasqueradesAsUndefined = branchTest8(Zero, Address(regT2, Structure::typeInfoFlagsOffset()), TrustedImm32(MasqueradesAsUndefined));
- move(TrustedImmPtr(m_codeBlock->globalObject()), regT0);
- addJump(branchPtr(Equal, Address(regT2, Structure::globalObjectOffset()), regT0), target);
- Jump masqueradesGlobalObjectIsForeign = jump();
- // Now handle the immediate cases - undefined & null
- isImmediate.link(this);
- and64(TrustedImm32(~TagBitUndefined), regT0);
- addJump(branch64(Equal, regT0, TrustedImm64(JSValue::encode(jsNull()))), target);
- isNotMasqueradesAsUndefined.link(this);
- masqueradesGlobalObjectIsForeign.link(this);
- };
- void JIT::emit_op_jneq_null(Instruction* currentInstruction)
- {
- unsigned src = currentInstruction[1].u.operand;
- unsigned target = currentInstruction[2].u.operand;
- emitGetVirtualRegister(src, regT0);
- Jump isImmediate = emitJumpIfNotJSCell(regT0);
- // First, handle JSCell cases - check MasqueradesAsUndefined bit on the structure.
- loadPtr(Address(regT0, JSCell::structureOffset()), regT2);
- addJump(branchTest8(Zero, Address(regT2, Structure::typeInfoFlagsOffset()), TrustedImm32(MasqueradesAsUndefined)), target);
- move(TrustedImmPtr(m_codeBlock->globalObject()), regT0);
- addJump(branchPtr(NotEqual, Address(regT2, Structure::globalObjectOffset()), regT0), target);
- Jump wasNotImmediate = jump();
- // Now handle the immediate cases - undefined & null
- isImmediate.link(this);
- and64(TrustedImm32(~TagBitUndefined), regT0);
- addJump(branch64(NotEqual, regT0, TrustedImm64(JSValue::encode(jsNull()))), target);
- wasNotImmediate.link(this);
- }
- void JIT::emit_op_jneq_ptr(Instruction* currentInstruction)
- {
- unsigned src = currentInstruction[1].u.operand;
- Special::Pointer ptr = currentInstruction[2].u.specialPointer;
- unsigned target = currentInstruction[3].u.operand;
-
- emitGetVirtualRegister(src, regT0);
- addJump(branchPtr(NotEqual, regT0, TrustedImmPtr(actualPointerFor(m_codeBlock, ptr))), target);
- }
- void JIT::emit_op_eq(Instruction* currentInstruction)
- {
- emitGetVirtualRegisters(currentInstruction[2].u.operand, regT0, currentInstruction[3].u.operand, regT1);
- emitJumpSlowCaseIfNotImmediateIntegers(regT0, regT1, regT2);
- compare32(Equal, regT1, regT0, regT0);
- emitTagAsBoolImmediate(regT0);
- emitPutVirtualRegister(currentInstruction[1].u.operand);
- }
- void JIT::emit_op_jtrue(Instruction* currentInstruction)
- {
- unsigned target = currentInstruction[2].u.operand;
- emitGetVirtualRegister(currentInstruction[1].u.operand, regT0);
- Jump isZero = branch64(Equal, regT0, TrustedImm64(JSValue::encode(jsNumber(0))));
- addJump(emitJumpIfImmediateInteger(regT0), target);
- addJump(branch64(Equal, regT0, TrustedImm64(JSValue::encode(jsBoolean(true)))), target);
- addSlowCase(branch64(NotEqual, regT0, TrustedImm64(JSValue::encode(jsBoolean(false)))));
- isZero.link(this);
- }
- void JIT::emit_op_neq(Instruction* currentInstruction)
- {
- emitGetVirtualRegisters(currentInstruction[2].u.operand, regT0, currentInstruction[3].u.operand, regT1);
- emitJumpSlowCaseIfNotImmediateIntegers(regT0, regT1, regT2);
- compare32(NotEqual, regT1, regT0, regT0);
- emitTagAsBoolImmediate(regT0);
- emitPutVirtualRegister(currentInstruction[1].u.operand);
- }
- void JIT::emit_op_bitxor(Instruction* currentInstruction)
- {
- emitGetVirtualRegisters(currentInstruction[2].u.operand, regT0, currentInstruction[3].u.operand, regT1);
- emitJumpSlowCaseIfNotImmediateIntegers(regT0, regT1, regT2);
- xor64(regT1, regT0);
- emitFastArithReTagImmediate(regT0, regT0);
- emitPutVirtualRegister(currentInstruction[1].u.operand);
- }
- void JIT::emit_op_bitor(Instruction* currentInstruction)
- {
- emitGetVirtualRegisters(currentInstruction[2].u.operand, regT0, currentInstruction[3].u.operand, regT1);
- emitJumpSlowCaseIfNotImmediateIntegers(regT0, regT1, regT2);
- or64(regT1, regT0);
- emitPutVirtualRegister(currentInstruction[1].u.operand);
- }
- void JIT::emit_op_throw(Instruction* currentInstruction)
- {
- JITStubCall stubCall(this, cti_op_throw);
- stubCall.addArgument(currentInstruction[1].u.operand, regT2);
- stubCall.call();
- ASSERT(regT0 == returnValueRegister);
- #ifndef NDEBUG
- // cti_op_throw always changes it's return address,
- // this point in the code should never be reached.
- breakpoint();
- #endif
- }
- void JIT::emit_op_get_pnames(Instruction* currentInstruction)
- {
- int dst = currentInstruction[1].u.operand;
- int base = currentInstruction[2].u.operand;
- int i = currentInstruction[3].u.operand;
- int size = currentInstruction[4].u.operand;
- int breakTarget = currentInstruction[5].u.operand;
- JumpList isNotObject;
- emitGetVirtualRegister(base, regT0);
- if (!m_codeBlock->isKnownNotImmediate(base))
- isNotObject.append(emitJumpIfNotJSCell(regT0));
- if (base != m_codeBlock->thisRegister() || m_codeBlock->isStrictMode()) {
- loadPtr(Address(regT0, JSCell::structureOffset()), regT2);
- isNotObject.append(emitJumpIfNotObject(regT2));
- }
- // We could inline the case where you have a valid cache, but
- // this call doesn't seem to be hot.
- Label isObject(this);
- JITStubCall getPnamesStubCall(this, cti_op_get_pnames);
- getPnamesStubCall.addArgument(regT0);
- getPnamesStubCall.call(dst);
- load32(Address(regT0, OBJECT_OFFSETOF(JSPropertyNameIterator, m_jsStringsSize)), regT3);
- store64(tagTypeNumberRegister, addressFor(i));
- store32(TrustedImm32(Int32Tag), intTagFor(size));
- store32(regT3, intPayloadFor(size));
- Jump end = jump();
- isNotObject.link(this);
- move(regT0, regT1);
- and32(TrustedImm32(~TagBitUndefined), regT1);
- addJump(branch32(Equal, regT1, TrustedImm32(ValueNull)), breakTarget);
- JITStubCall toObjectStubCall(this, cti_to_object);
- toObjectStubCall.addArgument(regT0);
- toObjectStubCall.call(base);
- jump().linkTo(isObject, this);
-
- end.link(this);
- }
- void JIT::emit_op_next_pname(Instruction* currentInstruction)
- {
- int dst = currentInstruction[1].u.operand;
- int base = currentInstruction[2].u.operand;
- int i = currentInstruction[3].u.operand;
- int size = currentInstruction[4].u.operand;
- int it = currentInstruction[5].u.operand;
- int target = currentInstruction[6].u.operand;
-
- JumpList callHasProperty;
- Label begin(this);
- load32(intPayloadFor(i), regT0);
- Jump end = branch32(Equal, regT0, intPayloadFor(size));
- // Grab key @ i
- loadPtr(addressFor(it), regT1);
- loadPtr(Address(regT1, OBJECT_OFFSETOF(JSPropertyNameIterator, m_jsStrings)), regT2);
- load64(BaseIndex(regT2, regT0, TimesEight), regT2);
- emitPutVirtualRegister(dst, regT2);
- // Increment i
- add32(TrustedImm32(1), regT0);
- store32(regT0, intPayloadFor(i));
- // Verify that i is valid:
- emitGetVirtualRegister(base, regT0);
- // Test base's structure
- loadPtr(Address(regT0, JSCell::structureOffset()), regT2);
- callHasProperty.append(branchPtr(NotEqual, regT2, Address(Address(regT1, OBJECT_OFFSETOF(JSPropertyNameIterator, m_cachedStructure)))));
- // Test base's prototype chain
- loadPtr(Address(Address(regT1, OBJECT_OFFSETOF(JSPropertyNameIterator, m_cachedPrototypeChain))), regT3);
- loadPtr(Address(regT3, OBJECT_OFFSETOF(StructureChain, m_vector)), regT3);
- addJump(branchTestPtr(Zero, Address(regT3)), target);
- Label checkPrototype(this);
- load64(Address(regT2, Structure::prototypeOffset()), regT2);
- callHasProperty.append(emitJumpIfNotJSCell(regT2));
- loadPtr(Address(regT2, JSCell::structureOffset()), regT2);
- callHasProperty.append(branchPtr(NotEqual, regT2, Address(regT3)));
- addPtr(TrustedImm32(sizeof(Structure*)), regT3);
- branchTestPtr(NonZero, Address(regT3)).linkTo(checkPrototype, this);
- // Continue loop.
- addJump(jump(), target);
- // Slow case: Ask the object if i is valid.
- callHasProperty.link(this);
- emitGetVirtualRegister(dst, regT1);
- JITStubCall stubCall(this, cti_has_property);
- stubCall.addArgument(regT0);
- stubCall.addArgument(regT1);
- stubCall.call();
- // Test for valid key.
- addJump(branchTest32(NonZero, regT0), target);
- jump().linkTo(begin, this);
- // End of loop.
- end.link(this);
- }
- void JIT::emit_op_push_with_scope(Instruction* currentInstruction)
- {
- JITStubCall stubCall(this, cti_op_push_with_scope);
- stubCall.addArgument(currentInstruction[1].u.operand, regT2);
- stubCall.call();
- }
- void JIT::emit_op_pop_scope(Instruction*)
- {
- JITStubCall(this, cti_op_pop_scope).call();
- }
- void JIT::compileOpStrictEq(Instruction* currentInstruction, CompileOpStrictEqType type)
- {
- unsigned dst = currentInstruction[1].u.operand;
- unsigned src1 = currentInstruction[2].u.operand;
- unsigned src2 = currentInstruction[3].u.operand;
- emitGetVirtualRegisters(src1, regT0, src2, regT1);
-
- // Jump slow if both are cells (to cover strings).
- move(regT0, regT2);
- or64(regT1, regT2);
- addSlowCase(emitJumpIfJSCell(regT2));
-
- // Jump slow if either is a double. First test if it's an integer, which is fine, and then test
- // if it's a double.
- Jump leftOK = emitJumpIfImmediateInteger(regT0);
- addSlowCase(emitJumpIfImmediateNumber(regT0));
- leftOK.link(this);
- Jump rightOK = emitJumpIfImmediateInteger(regT1);
- addSlowCase(emitJumpIfImmediateNumber(regT1));
- rightOK.link(this);
- if (type == OpStrictEq)
- compare64(Equal, regT1, regT0, regT0);
- else
- compare64(NotEqual, regT1, regT0, regT0);
- emitTagAsBoolImmediate(regT0);
- emitPutVirtualRegister(dst);
- }
- void JIT::emit_op_stricteq(Instruction* currentInstruction)
- {
- compileOpStrictEq(currentInstruction, OpStrictEq);
- }
- void JIT::emit_op_nstricteq(Instruction* currentInstruction)
- {
- compileOpStrictEq(currentInstruction, OpNStrictEq);
- }
- void JIT::emit_op_to_number(Instruction* currentInstruction)
- {
- int srcVReg = currentInstruction[2].u.operand;
- emitGetVirtualRegister(srcVReg, regT0);
-
- addSlowCase(emitJumpIfNotImmediateNumber(regT0));
- emitPutVirtualRegister(currentInstruction[1].u.operand);
- }
- void JIT::emit_op_push_name_scope(Instruction* currentInstruction)
- {
- JITStubCall stubCall(this, cti_op_push_name_scope);
- stubCall.addArgument(TrustedImmPtr(&m_codeBlock->identifier(currentInstruction[1].u.operand)));
- stubCall.addArgument(currentInstruction[2].u.operand, regT2);
- stubCall.addArgument(TrustedImm32(currentInstruction[3].u.operand));
- stubCall.call();
- }
- void JIT::emit_op_catch(Instruction* currentInstruction)
- {
- killLastResultRegister(); // FIXME: Implicitly treat op_catch as a labeled statement, and remove this line of code.
- move(regT0, callFrameRegister);
- peek(regT3, OBJECT_OFFSETOF(struct JITStackFrame, vm) / sizeof(void*));
- load64(Address(regT3, OBJECT_OFFSETOF(VM, exception)), regT0);
- store64(TrustedImm64(JSValue::encode(JSValue())), Address(regT3, OBJECT_OFFSETOF(VM, exception)));
- emitPutVirtualRegister(currentInstruction[1].u.operand);
- }
- void JIT::emit_op_switch_imm(Instruction* currentInstruction)
- {
- unsigned tableIndex = currentInstruction[1].u.operand;
- unsigned defaultOffset = currentInstruction[2].u.operand;
- unsigned scrutinee = currentInstruction[3].u.operand;
- // create jump table for switch destinations, track this switch statement.
- SimpleJumpTable* jumpTable = &m_codeBlock->immediateSwitchJumpTable(tableIndex);
- m_switches.append(SwitchRecord(jumpTable, m_bytecodeOffset, defaultOffset, SwitchRecord::Immediate));
- jumpTable->ctiOffsets.grow(jumpTable->branchOffsets.size());
- JITStubCall stubCall(this, cti_op_switch_imm);
- stubCall.addArgument(scrutinee, regT2);
- stubCall.addArgument(TrustedImm32(tableIndex));
- stubCall.call();
- jump(regT0);
- }
- void JIT::emit_op_switch_char(Instruction* currentInstruction)
- {
- unsigned tableIndex = currentInstruction[1].u.operand;
- unsigned defaultOffset = currentInstruction[2].u.operand;
- unsigned scrutinee = currentInstruction[3].u.operand;
- // create jump table for switch destinations, track this switch statement.
- SimpleJumpTable* jumpTable = &m_codeBlock->characterSwitchJumpTable(tableIndex);
- m_switches.append(SwitchRecord(jumpTable, m_bytecodeOffset, defaultOffset, SwitchRecord::Character));
- jumpTable->ctiOffsets.grow(jumpTable->branchOffsets.size());
- JITStubCall stubCall(this, cti_op_switch_char);
- stubCall.addArgument(scrutinee, regT2);
- stubCall.addArgument(TrustedImm32(tableIndex));
- stubCall.call();
- jump(regT0);
- }
- void JIT::emit_op_switch_string(Instruction* currentInstruction)
- {
- unsigned tableIndex = currentInstruction[1].u.operand;
- unsigned defaultOffset = currentInstruction[2].u.operand;
- unsigned scrutinee = currentInstruction[3].u.operand;
- // create jump table for switch destinations, track this switch statement.
- StringJumpTable* jumpTable = &m_codeBlock->stringSwitchJumpTable(tableIndex);
- m_switches.append(SwitchRecord(jumpTable, m_bytecodeOffset, defaultOffset));
- JITStubCall stubCall(this, cti_op_switch_string);
- stubCall.addArgument(scrutinee, regT2);
- stubCall.addArgument(TrustedImm32(tableIndex));
- stubCall.call();
- jump(regT0);
- }
- void JIT::emit_op_throw_static_error(Instruction* currentInstruction)
- {
- JITStubCall stubCall(this, cti_op_throw_static_error);
- if (!m_codeBlock->getConstant(currentInstruction[1].u.operand).isNumber())
- stubCall.addArgument(TrustedImm64(JSValue::encode(m_codeBlock->getConstant(currentInstruction[1].u.operand))));
- else
- stubCall.addArgument(Imm64(JSValue::encode(m_codeBlock->getConstant(currentInstruction[1].u.operand))));
- stubCall.addArgument(TrustedImm32(currentInstruction[2].u.operand));
- stubCall.call();
- }
- void JIT::emit_op_debug(Instruction* currentInstruction)
- {
- #if ENABLE(DEBUG_WITH_BREAKPOINT)
- UNUSED_PARAM(currentInstruction);
- breakpoint();
- #else
- JITStubCall stubCall(this, cti_op_debug);
- stubCall.addArgument(TrustedImm32(currentInstruction[1].u.operand));
- stubCall.addArgument(TrustedImm32(currentInstruction[2].u.operand));
- stubCall.addArgument(TrustedImm32(currentInstruction[3].u.operand));
- stubCall.addArgument(TrustedImm32(currentInstruction[4].u.operand));
- stubCall.call();
- #endif
- }
- void JIT::emit_op_eq_null(Instruction* currentInstruction)
- {
- unsigned dst = currentInstruction[1].u.operand;
- unsigned src1 = currentInstruction[2].u.operand;
- emitGetVirtualRegister(src1, regT0);
- Jump isImmediate = emitJumpIfNotJSCell(regT0);
- loadPtr(Address(regT0, JSCell::structureOffset()), regT2);
- Jump isMasqueradesAsUndefined = branchTest8(NonZero, Address(regT2, Structure::typeInfoFlagsOffset()), TrustedImm32(MasqueradesAsUndefined));
- move(TrustedImm32(0), regT0);
- Jump wasNotMasqueradesAsUndefined = jump();
- isMasqueradesAsUndefined.link(this);
- move(TrustedImmPtr(m_codeBlock->globalObject()), regT0);
- loadPtr(Address(regT2, Structure::globalObjectOffset()), regT2);
- comparePtr(Equal, regT0, regT2, regT0);
- Jump wasNotImmediate = jump();
- isImmediate.link(this);
- and64(TrustedImm32(~TagBitUndefined), regT0);
- compare64(Equal, regT0, TrustedImm32(ValueNull), regT0);
- wasNotImmediate.link(this);
- wasNotMasqueradesAsUndefined.link(this);
- emitTagAsBoolImmediate(regT0);
- emitPutVirtualRegister(dst);
- }
- void JIT::emit_op_neq_null(Instruction* currentInstruction)
- {
- unsigned dst = currentInstruction[1].u.operand;
- unsigned src1 = currentInstruction[2].u.operand;
- emitGetVirtualRegister(src1, regT0);
- Jump isImmediate = emitJumpIfNotJSCell(regT0);
- loadPtr(Address(regT0, JSCell::structureOffset()), regT2);
- Jump isMasqueradesAsUndefined = branchTest8(NonZero, Address(regT2, Structure::typeInfoFlagsOffset()), TrustedImm32(MasqueradesAsUndefined));
- move(TrustedImm32(1), regT0);
- Jump wasNotMasqueradesAsUndefined = jump();
- isMasqueradesAsUndefined.link(this);
- move(TrustedImmPtr(m_codeBlock->globalObject()), regT0);
- loadPtr(Address(regT2, Structure::globalObjectOffset()), regT2);
- comparePtr(NotEqual, regT0, regT2, regT0);
- Jump wasNotImmediate = jump();
- isImmediate.link(this);
- and64(TrustedImm32(~TagBitUndefined), regT0);
- compare64(NotEqual, regT0, TrustedImm32(ValueNull), regT0);
- wasNotImmediate.link(this);
- wasNotMasqueradesAsUndefined.link(this);
- emitTagAsBoolImmediate(regT0);
- emitPutVirtualRegister(dst);
- }
- void JIT::emit_op_enter(Instruction*)
- {
- emitEnterOptimizationCheck();
-
- // Even though CTI doesn't use them, we initialize our constant
- // registers to zap stale pointers, to avoid unnecessarily prolonging
- // object lifetime and increasing GC pressure.
- size_t count = m_codeBlock->m_numVars;
- for (size_t j = 0; j < count; ++j)
- emitInitRegister(j);
- }
- void JIT::emit_op_create_activation(Instruction* currentInstruction)
- {
- unsigned dst = currentInstruction[1].u.operand;
-
- Jump activationCreated = branchTest64(NonZero, Address(callFrameRegister, sizeof(Register) * dst));
- JITStubCall(this, cti_op_push_activation).call(currentInstruction[1].u.operand);
- emitPutVirtualRegister(dst);
- activationCreated.link(this);
- }
- void JIT::emit_op_create_arguments(Instruction* currentInstruction)
- {
- unsigned dst = currentInstruction[1].u.operand;
- Jump argsCreated = branchTest64(NonZero, Address(callFrameRegister, sizeof(Register) * dst));
- JITStubCall(this, cti_op_create_arguments).call();
- emitPutVirtualRegister(dst);
- emitPutVirtualRegister(unmodifiedArgumentsRegister(dst));
- argsCreated.link(this);
- }
- void JIT::emit_op_init_lazy_reg(Instruction* currentInstruction)
- {
- unsigned dst = currentInstruction[1].u.operand;
- store64(TrustedImm64((int64_t)0), Address(callFrameRegister, sizeof(Register) * dst));
- }
- void JIT::emit_op_convert_this(Instruction* currentInstruction)
- {
- emitGetVirtualRegister(currentInstruction[1].u.operand, regT1);
- emitJumpSlowCaseIfNotJSCell(regT1);
- if (shouldEmitProfiling()) {
- loadPtr(Address(regT1, JSCell::structureOffset()), regT0);
- emitValueProfilingSite();
- }
- addSlowCase(branchPtr(Equal, Address(regT1, JSCell::structureOffset()), TrustedImmPtr(m_vm->stringStructure.get())));
- }
- void JIT::emit_op_get_callee(Instruction* currentInstruction)
- {
- unsigned result = currentInstruction[1].u.operand;
- emitGetFromCallFrameHeaderPtr(JSStack::Callee, regT0);
- emitValueProfilingSite();
- emitPutVirtualRegister(result);
- }
- void JIT::emit_op_create_this(Instruction* currentInstruction)
- {
- int callee = currentInstruction[2].u.operand;
- RegisterID calleeReg = regT0;
- RegisterID resultReg = regT0;
- RegisterID allocatorReg = regT1;
- RegisterID structureReg = regT2;
- RegisterID scratchReg = regT3;
- emitGetVirtualRegister(callee, calleeReg);
- loadPtr(Address(calleeReg, JSFunction::offsetOfAllocationProfile() + ObjectAllocationProfile::offsetOfAllocator()), allocatorReg);
- loadPtr(Address(calleeReg, JSFunction::offsetOfAllocationProfile() + ObjectAllocationProfile::offsetOfStructure()), structureReg);
- addSlowCase(branchTestPtr(Zero, allocatorReg));
- emitAllocateJSObject(allocatorReg, structureReg, resultReg, scratchReg);
- emitPutVirtualRegister(currentInstruction[1].u.operand);
- }
- void JIT::emitSlow_op_create_this(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
- {
- linkSlowCase(iter); // doesn't have an allocation profile
- linkSlowCase(iter); // allocation failed
- JITStubCall stubCall(this, cti_op_create_this);
- stubCall.addArgument(TrustedImm32(currentInstruction[3].u.operand));
- stubCall.call(currentInstruction[1].u.operand);
- }
- void JIT::emit_op_profile_will_call(Instruction* currentInstruction)
- {
- JITStubCall stubCall(this, cti_op_profile_will_call);
- stubCall.addArgument(currentInstruction[1].u.operand, regT1);
- stubCall.call();
- }
- void JIT::emit_op_profile_did_call(Instruction* currentInstruction)
- {
- JITStubCall stubCall(this, cti_op_profile_did_call);
- stubCall.addArgument(currentInstruction[1].u.operand, regT1);
- stubCall.call();
- }
- // Slow cases
- void JIT::emitSlow_op_convert_this(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
- {
- void* globalThis = m_codeBlock->globalObject()->globalThis();
- linkSlowCase(iter);
- if (shouldEmitProfiling())
- move(TrustedImm64((JSValue::encode(jsUndefined()))), regT0);
- Jump isNotUndefined = branch64(NotEqual, regT1, TrustedImm64(JSValue::encode(jsUndefined())));
- emitValueProfilingSite();
- move(TrustedImm64(JSValue::encode(JSValue(static_cast<JSCell*>(globalThis)))), regT0);
- emitPutVirtualRegister(currentInstruction[1].u.operand, regT0);
- emitJumpSlowToHot(jump(), OPCODE_LENGTH(op_convert_this));
- linkSlowCase(iter);
- if (shouldEmitProfiling())
- move(TrustedImm64(JSValue::encode(m_vm->stringStructure.get())), regT0);
- isNotUndefined.link(this);
- emitValueProfilingSite();
- JITStubCall stubCall(this, cti_op_convert_this);
- stubCall.addArgument(regT1);
- stubCall.call(currentInstruction[1].u.operand);
- }
- void JIT::emitSlow_op_to_primitive(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
- {
- linkSlowCase(iter);
- JITStubCall stubCall(this, cti_op_to_primitive);
- stubCall.addArgument(regT0);
- stubCall.call(currentInstruction[1].u.operand);
- }
- void JIT::emitSlow_op_not(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
- {
- linkSlowCase(iter);
- xor64(TrustedImm32(static_cast<int32_t>(ValueFalse)), regT0);
- JITStubCall stubCall(this, cti_op_not);
- stubCall.addArgument(regT0);
- stubCall.call(currentInstruction[1].u.operand);
- }
- void JIT::emitSlow_op_jfalse(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
- {
- linkSlowCase(iter);
- JITStubCall stubCall(this, cti_op_jtrue);
- stubCall.addArgument(regT0);
- stubCall.call();
- emitJumpSlowToHot(branchTest32(Zero, regT0), currentInstruction[2].u.operand); // inverted!
- }
- void JIT::emitSlow_op_jtrue(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
- {
- linkSlowCase(iter);
- JITStubCall stubCall(this, cti_op_jtrue);
- stubCall.addArgument(regT0);
- stubCall.call();
- emitJumpSlowToHot(branchTest32(NonZero, regT0), currentInstruction[2].u.operand);
- }
- void JIT::emitSlow_op_bitxor(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
- {
- linkSlowCase(iter);
- JITStubCall stubCall(this, cti_op_bitxor);
- stubCall.addArgument(regT0);
- stubCall.addArgument(regT1);
- stubCall.call(currentInstruction[1].u.operand);
- }
- void JIT::emitSlow_op_bitor(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
- {
- linkSlowCase(iter);
- JITStubCall stubCall(this, cti_op_bitor);
- stubCall.addArgument(regT0);
- stubCall.addArgument(regT1);
- stubCall.call(currentInstruction[1].u.operand);
- }
- void JIT::emitSlow_op_eq(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
- {
- linkSlowCase(iter);
- JITStubCall stubCall(this, cti_op_eq);
- stubCall.addArgument(regT0);
- stubCall.addArgument(regT1);
- stubCall.call();
- emitTagAsBoolImmediate(regT0);
- emitPutVirtualRegister(currentInstruction[1].u.operand);
- }
- void JIT::emitSlow_op_neq(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
- {
- linkSlowCase(iter);
- JITStubCall stubCall(this, cti_op_eq);
- stubCall.addArgument(regT0);
- stubCall.addArgument(regT1);
- stubCall.call();
- xor32(TrustedImm32(0x1), regT0);
- emitTagAsBoolImmediate(regT0);
- emitPutVirtualRegister(currentInstruction[1].u.operand);
- }
- void JIT::emitSlow_op_stricteq(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
- {
- linkSlowCase(iter);
- linkSlowCase(iter);
- linkSlowCase(iter);
- JITStubCall stubCall(this, cti_op_stricteq);
- stubCall.addArgument(regT0);
- stubCall.addArgument(regT1);
- stubCall.call(currentInstruction[1].u.operand);
- }
- void JIT::emitSlow_op_nstricteq(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
- {
- linkSlowCase(iter);
- linkSlowCase(iter);
- linkSlowCase(iter);
- JITStubCall stubCall(this, cti_op_nstricteq);
- stubCall.addArgument(regT0);
- stubCall.addArgument(regT1);
- stubCall.call(currentInstruction[1].u.operand);
- }
- void JIT::emitSlow_op_check_has_instance(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
- {
- unsigned dst = currentInstruction[1].u.operand;
- unsigned value = currentInstruction[2].u.operand;
- unsigned baseVal = currentInstruction[3].u.operand;
- linkSlowCaseIfNotJSCell(iter, baseVal);
- linkSlowCase(iter);
- JITStubCall stubCall(this, cti_op_check_has_instance);
- stubCall.addArgument(value, regT2);
- stubCall.addArgument(baseVal, regT2);
- stubCall.call(dst);
- emitJumpSlowToHot(jump(), currentInstruction[4].u.operand);
- }
- void JIT::emitSlow_op_instanceof(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
- {
- unsigned dst = currentInstruction[1].u.operand;
- unsigned value = currentInstruction[2].u.operand;
- unsigned proto = currentInstruction[3].u.operand;
- linkSlowCaseIfNotJSCell(iter, value);
- linkSlowCaseIfNotJSCell(iter, proto);
- linkSlowCase(iter);
- JITStubCall stubCall(this, cti_op_instanceof);
- stubCall.addArgument(value, regT2);
- stubCall.addArgument(proto, regT2);
- stubCall.call(dst);
- }
- void JIT::emitSlow_op_call(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
- {
- compileOpCallSlowCase(op_call, currentInstruction, iter, m_callLinkInfoIndex++);
- }
- void JIT::emitSlow_op_call_eval(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
- {
- compileOpCallSlowCase(op_call_eval, currentInstruction, iter, m_callLinkInfoIndex);
- }
-
- void JIT::emitSlow_op_call_varargs(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
- {
- compileOpCallSlowCase(op_call_varargs, currentInstruction, iter, m_callLinkInfoIndex++);
- }
- void JIT::emitSlow_op_construct(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
- {
- compileOpCallSlowCase(op_construct, currentInstruction, iter, m_callLinkInfoIndex++);
- }
- void JIT::emitSlow_op_to_number(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
- {
- linkSlowCase(iter);
- JITStubCall stubCall(this, cti_op_to_number);
- stubCall.addArgument(regT0);
- stubCall.call(currentInstruction[1].u.operand);
- }
- void JIT::emit_op_get_arguments_length(Instruction* currentInstruction)
- {
- int dst = currentInstruction[1].u.operand;
- int argumentsRegister = currentInstruction[2].u.operand;
- addSlowCase(branchTest64(NonZero, addressFor(argumentsRegister)));
- emitGetFromCallFrameHeader32(JSStack::ArgumentCount, regT0);
- sub32(TrustedImm32(1), regT0);
- emitFastArithReTagImmediate(regT0, regT0);
- emitPutVirtualRegister(dst, regT0);
- }
- void JIT::emitSlow_op_get_arguments_length(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
- {
- linkSlowCase(iter);
- unsigned dst = currentInstruction[1].u.operand;
- unsigned base = currentInstruction[2].u.operand;
- Identifier* ident = &(m_codeBlock->identifier(currentInstruction[3].u.operand));
-
- emitGetVirtualRegister(base, regT0);
- JITStubCall stubCall(this, cti_op_get_by_id_generic);
- stubCall.addArgument(regT0);
- stubCall.addArgument(TrustedImmPtr(ident));
- stubCall.call(dst);
- }
- void JIT::emit_op_get_argument_by_val(Instruction* currentInstruction)
- {
- int dst = currentInstruction[1].u.operand;
- int argumentsRegister = currentInstruction[2].u.operand;
- int property = currentInstruction[3].u.operand;
- addSlowCase(branchTest64(NonZero, addressFor(argumentsRegister)));
- emitGetVirtualRegister(property, regT1);
- addSlowCase(emitJumpIfNotImmediateInteger(regT1));
- add32(TrustedImm32(1), regT1);
- // regT1 now contains the integer index of the argument we want, including this
- emitGetFromCallFrameHeader32(JSStack::ArgumentCount, regT2);
- addSlowCase(branch32(AboveOrEqual, regT1, regT2));
- neg32(regT1);
- signExtend32ToPtr(regT1, regT1);
- load64(BaseIndex(callFrameRegister, regT1, TimesEight, CallFrame::thisArgumentOffset() * static_cast<int>(sizeof(Register))), regT0);
- emitValueProfilingSite();
- emitPutVirtualRegister(dst, regT0);
- }
- void JIT::emitSlow_op_get_argument_by_val(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
- {
- unsigned dst = currentInstruction[1].u.operand;
- unsigned arguments = currentInstruction[2].u.operand;
- unsigned property = currentInstruction[3].u.operand;
-
- linkSlowCase(iter);
- Jump skipArgumentsCreation = jump();
-
- linkSlowCase(iter);
- linkSlowCase(iter);
- JITStubCall(this, cti_op_create_arguments).call();
- emitPutVirtualRegister(arguments);
- emitPutVirtualRegister(unmodifiedArgumentsRegister(arguments));
-
- skipArgumentsCreation.link(this);
- JITStubCall stubCall(this, cti_op_get_by_val_generic);
- stubCall.addArgument(arguments, regT2);
- stubCall.addArgument(property, regT2);
- stubCall.callWithValueProfiling(dst);
- }
- void JIT::emit_op_put_to_base(Instruction* currentInstruction)
- {
- int base = currentInstruction[1].u.operand;
- int id = currentInstruction[2].u.operand;
- int value = currentInstruction[3].u.operand;
- PutToBaseOperation* operation = currentInstruction[4].u.putToBaseOperation;
- switch (operation->m_kind) {
- case PutToBaseOperation::GlobalVariablePutChecked:
- addSlowCase(branchTest8(NonZero, AbsoluteAddress(operation->m_predicatePointer)));
- case PutToBaseOperation::GlobalVariablePut: {
- JSGlobalObject* globalObject = m_codeBlock->globalObject();
- if (operation->m_isDynamic) {
- emitGetVirtualRegister(base, regT0);
- addSlowCase(branchPtr(NotEqual, regT0, TrustedImmPtr(globalObject)));
- }
- emitGetVirtualRegister(value, regT0);
- store64(regT0, operation->m_registerAddress);
- if (Heap::isWriteBarrierEnabled())
- emitWriteBarrier(globalObject, regT0, regT2, ShouldFilterImmediates, WriteBarrierForVariableAccess);
- return;
- }
- case PutToBaseOperation::VariablePut: {
- emitGetVirtualRegisters(base, regT0, value, regT1);
- loadPtr(Address(regT0, JSVariableObject::offsetOfRegisters()), regT2);
- store64(regT1, Address(regT2, operation->m_offset * sizeof(Register)));
- if (Heap::isWriteBarrierEnabled())
- emitWriteBarrier(regT0, regT1, regT2, regT3, ShouldFilterImmediates, WriteBarrierForVariableAccess);
- return;
- }
- case PutToBaseOperation::GlobalPropertyPut: {
- emitGetVirtualRegisters(base, regT0, value, regT1);
- loadPtr(&operation->m_structure, regT2);
- addSlowCase(branchPtr(NotEqual, Address(regT0, JSCell::structureOffset()), regT2));
- ASSERT(!operation->m_structure || !operation->m_structure->inlineCapacity());
- loadPtr(Address(regT0, JSObject::butterflyOffset()), regT2);
- load32(&operation->m_offsetInButterfly, regT3);
- signExtend32ToPtr(regT3, regT3);
- store64(regT1, BaseIndex(regT2, regT3, TimesEight));
- if (Heap::isWriteBarrierEnabled())
- emitWriteBarrier(regT0, regT1, regT2, regT3, ShouldFilterImmediates, WriteBarrierForVariableAccess);
- return;
- }
- case PutToBaseOperation::Uninitialised:
- case PutToBaseOperation::Readonly:
- case PutToBaseOperation::Generic:
- JITStubCall stubCall(this, cti_op_put_to_base);
- stubCall.addArgument(TrustedImm32(base));
- stubCall.addArgument(TrustedImmPtr(&m_codeBlock->identifier(id)));
- stubCall.addArgument(TrustedImm32(value));
- stubCall.addArgument(TrustedImmPtr(operation));
- stubCall.call();
- return;
- }
- }
- #endif // USE(JSVALUE64)
- void JIT::emit_op_loop_hint(Instruction*)
- {
- // Emit the JIT optimization check:
- if (canBeOptimized())
- addSlowCase(branchAdd32(PositiveOrZero, TrustedImm32(Options::executionCounterIncrementForLoop()),
- AbsoluteAddress(m_codeBlock->addressOfJITExecuteCounter())));
- // Emit the watchdog timer check:
- if (m_vm->watchdog.isEnabled())
- addSlowCase(branchTest8(NonZero, AbsoluteAddress(m_vm->watchdog.timerDidFireAddress())));
- }
- void JIT::emitSlow_op_loop_hint(Instruction*, Vector<SlowCaseEntry>::iterator& iter)
- {
- #if ENABLE(DFG_JIT)
- // Emit the slow path for the JIT optimization check:
- if (canBeOptimized()) {
- linkSlowCase(iter);
- JITStubCall stubCall(this, cti_optimize);
- stubCall.addArgument(TrustedImm32(m_bytecodeOffset));
- stubCall.call();
- emitJumpSlowToHot(jump(), OPCODE_LENGTH(op_loop_hint));
- }
- #endif
- // Emit the slow path of the watchdog timer check:
- if (m_vm->watchdog.isEnabled()) {
- linkSlowCase(iter);
- JITStubCall stubCall(this, cti_handle_watchdog_timer);
- stubCall.call();
- emitJumpSlowToHot(jump(), OPCODE_LENGTH(op_loop_hint));
- }
- }
- void JIT::emit_resolve_operations(ResolveOperations* resolveOperations, const int* baseVR, const int* valueVR)
- {
- #if USE(JSVALUE32_64)
- unmap();
- #else
- killLastResultRegister();
- #endif
- if (resolveOperations->isEmpty()) {
- addSlowCase(jump());
- return;
- }
- const RegisterID value = regT0;
- #if USE(JSVALUE32_64)
- const RegisterID valueTag = regT1;
- #endif
- const RegisterID scope = regT2;
- const RegisterID scratch = regT3;
- JSGlobalObject* globalObject = m_codeBlock->globalObject();
- ResolveOperation* pc = resolveOperations->data();
- emitGetFromCallFrameHeaderPtr(JSStack::ScopeChain, scope);
- bool setBase = false;
- bool resolvingBase = true;
- while (resolvingBase) {
- switch (pc->m_operation) {
- case ResolveOperation::ReturnGlobalObjectAsBase:
- move(TrustedImmPtr(globalObject), value);
- #if USE(JSVALUE32_64)
- move(TrustedImm32(JSValue::CellTag), valueTag);
- #endif
- emitValueProfilingSite();
- emitStoreCell(*baseVR, value);
- return;
- case ResolveOperation::SetBaseToGlobal:
- RELEASE_ASSERT(baseVR);
- setBase