static MacroAssemblerCodeRef generateThunkWithJumpTo(VM* vm, void (*target)(), const char *thunkKind)
{
JSInterfaceJIT jit;
// FIXME: there's probably a better way to do it on X86, but I'm not sure I care.
jit.move(JSInterfaceJIT::TrustedImmPtr(bitwise_cast<void*>(target)), JSInterfaceJIT::regT0);
jit.jump(JSInterfaceJIT::regT0);
LinkBuffer patchBuffer(*vm, &jit, GLOBAL_THUNK_ID);
return FINALIZE_CODE(patchBuffer, ("LLInt %s prologue thunk", thunkKind));
}
static MacroAssemblerCodeRef linkForGenerator(VM* vm, FunctionPtr lazyLink, FunctionPtr notJSFunction, const char* name)
{
JSInterfaceJIT jit;
JSInterfaceJIT::JumpList slowCase;
#if USE(JSVALUE64)
slowCase.append(jit.emitJumpIfNotJSCell(JSInterfaceJIT::regT0));
slowCase.append(jit.emitJumpIfNotType(JSInterfaceJIT::regT0, JSInterfaceJIT::regT1, JSFunctionType));
#else // USE(JSVALUE64)
slowCase.append(jit.branch32(JSInterfaceJIT::NotEqual, JSInterfaceJIT::regT1, JSInterfaceJIT::TrustedImm32(JSValue::CellTag)));
slowCase.append(jit.emitJumpIfNotType(JSInterfaceJIT::regT0, JSInterfaceJIT::regT1, JSFunctionType));
#endif // USE(JSVALUE64)
// Finish canonical initialization before JS function call.
jit.loadPtr(JSInterfaceJIT::Address(JSInterfaceJIT::regT0, JSFunction::offsetOfScopeChain()), JSInterfaceJIT::regT1);
jit.emitPutCellToCallFrameHeader(JSInterfaceJIT::regT1, JSStack::ScopeChain);
// Also initialize ReturnPC for use by lazy linking and exceptions.
jit.preserveReturnAddressAfterCall(JSInterfaceJIT::regT3);
jit.emitPutToCallFrameHeader(JSInterfaceJIT::regT3, JSStack::ReturnPC);
jit.storePtr(JSInterfaceJIT::callFrameRegister, &vm->topCallFrame);
jit.restoreArgumentReference();
JSInterfaceJIT::Call callLazyLink = jit.call();
jit.restoreReturnAddressBeforeReturn(JSInterfaceJIT::regT3);
jit.jump(JSInterfaceJIT::regT0);
slowCase.link(&jit);
JSInterfaceJIT::Call callNotJSFunction = generateSlowCaseFor(vm, jit);
LinkBuffer patchBuffer(*vm, &jit, GLOBAL_THUNK_ID);
patchBuffer.link(callLazyLink, lazyLink);
patchBuffer.link(callNotJSFunction, notJSFunction);
return FINALIZE_CODE(patchBuffer, ("link %s trampoline", name));
}
MacroAssemblerCodeRef arityFixup(VM* vm)
{
JSInterfaceJIT jit;
// We enter with fixup count in regT0
#if USE(JSVALUE64)
# if CPU(X86_64)
jit.pop(JSInterfaceJIT::regT4);
# endif
jit.addPtr(JSInterfaceJIT::TrustedImm32(-8), JSInterfaceJIT::callFrameRegister, JSInterfaceJIT::regT3);
jit.load32(JSInterfaceJIT::Address(JSInterfaceJIT::callFrameRegister, JSStack::ArgumentCount * 8), JSInterfaceJIT::regT2);
jit.add32(JSInterfaceJIT::TrustedImm32(JSStack::CallFrameHeaderSize), JSInterfaceJIT::regT2);
// Move current frame regT0 number of slots
JSInterfaceJIT::Label copyLoop(jit.label());
jit.load64(JSInterfaceJIT::regT3, JSInterfaceJIT::regT1);
jit.store64(JSInterfaceJIT::regT1, MacroAssembler::BaseIndex(JSInterfaceJIT::regT3, JSInterfaceJIT::regT0, JSInterfaceJIT::TimesEight));
jit.subPtr(JSInterfaceJIT::TrustedImm32(8), JSInterfaceJIT::regT3);
jit.branchSub32(MacroAssembler::NonZero, JSInterfaceJIT::TrustedImm32(1), JSInterfaceJIT::regT2).linkTo(copyLoop, &jit);
// Fill in regT0 missing arg slots with undefined
jit.move(JSInterfaceJIT::regT0, JSInterfaceJIT::regT2);
jit.move(JSInterfaceJIT::TrustedImm64(ValueUndefined), JSInterfaceJIT::regT1);
JSInterfaceJIT::Label fillUndefinedLoop(jit.label());
jit.store64(JSInterfaceJIT::regT1, MacroAssembler::BaseIndex(JSInterfaceJIT::regT3, JSInterfaceJIT::regT0, JSInterfaceJIT::TimesEight));
jit.subPtr(JSInterfaceJIT::TrustedImm32(8), JSInterfaceJIT::regT3);
jit.branchSub32(MacroAssembler::NonZero, JSInterfaceJIT::TrustedImm32(1), JSInterfaceJIT::regT2).linkTo(fillUndefinedLoop, &jit);
// Adjust call frame register to account for missing args
jit.lshift32(JSInterfaceJIT::TrustedImm32(3), JSInterfaceJIT::regT0);
jit.addPtr(JSInterfaceJIT::regT0, JSInterfaceJIT::callFrameRegister);
# if CPU(X86_64)
jit.push(JSInterfaceJIT::regT4);
# endif
jit.ret();
#else
# if CPU(X86)
jit.pop(JSInterfaceJIT::regT4);
# endif
jit.addPtr(JSInterfaceJIT::TrustedImm32(-8), JSInterfaceJIT::callFrameRegister, JSInterfaceJIT::regT3);
jit.load32(JSInterfaceJIT::Address(JSInterfaceJIT::callFrameRegister, JSStack::ArgumentCount * 8), JSInterfaceJIT::regT2);
jit.add32(JSInterfaceJIT::TrustedImm32(JSStack::CallFrameHeaderSize), JSInterfaceJIT::regT2);
// Move current frame regT0 number of slots
JSInterfaceJIT::Label copyLoop(jit.label());
jit.load32(JSInterfaceJIT::regT3, JSInterfaceJIT::regT1);
jit.store32(JSInterfaceJIT::regT1, MacroAssembler::BaseIndex(JSInterfaceJIT::regT3, JSInterfaceJIT::regT0, JSInterfaceJIT::TimesEight));
jit.load32(MacroAssembler::Address(JSInterfaceJIT::regT3, 4), JSInterfaceJIT::regT1);
jit.store32(JSInterfaceJIT::regT1, MacroAssembler::BaseIndex(JSInterfaceJIT::regT3, JSInterfaceJIT::regT0, JSInterfaceJIT::TimesEight, 4));
jit.subPtr(JSInterfaceJIT::TrustedImm32(8), JSInterfaceJIT::regT3);
jit.branchSub32(MacroAssembler::NonZero, JSInterfaceJIT::TrustedImm32(1), JSInterfaceJIT::regT2).linkTo(copyLoop, &jit);
// Fill in regT0 missing arg slots with undefined
jit.move(JSInterfaceJIT::regT0, JSInterfaceJIT::regT2);
JSInterfaceJIT::Label fillUndefinedLoop(jit.label());
jit.move(JSInterfaceJIT::TrustedImm32(0), JSInterfaceJIT::regT1);
jit.store32(JSInterfaceJIT::regT1, MacroAssembler::BaseIndex(JSInterfaceJIT::regT3, JSInterfaceJIT::regT0, JSInterfaceJIT::TimesEight));
jit.move(JSInterfaceJIT::TrustedImm32(JSValue::UndefinedTag), JSInterfaceJIT::regT1);
jit.store32(JSInterfaceJIT::regT1, MacroAssembler::BaseIndex(JSInterfaceJIT::regT3, JSInterfaceJIT::regT0, JSInterfaceJIT::TimesEight, 4));
jit.subPtr(JSInterfaceJIT::TrustedImm32(8), JSInterfaceJIT::regT3);
jit.branchSub32(MacroAssembler::NonZero, JSInterfaceJIT::TrustedImm32(1), JSInterfaceJIT::regT2).linkTo(fillUndefinedLoop, &jit);
// Adjust call frame register to account for missing args
jit.lshift32(JSInterfaceJIT::TrustedImm32(3), JSInterfaceJIT::regT0);
jit.addPtr(JSInterfaceJIT::regT0, JSInterfaceJIT::callFrameRegister);
# if CPU(X86)
jit.push(JSInterfaceJIT::regT4);
# endif
jit.ret();
#endif
LinkBuffer patchBuffer(*vm, &jit, GLOBAL_THUNK_ID);
return FINALIZE_CODE(patchBuffer, ("fixup arity"));
}
static MacroAssemblerCodeRef nativeForGenerator(VM* vm, CodeSpecializationKind kind)
{
int executableOffsetToFunction = NativeExecutable::offsetOfNativeFunctionFor(kind);
JSInterfaceJIT jit;
jit.emitPutImmediateToCallFrameHeader(0, JSStack::CodeBlock);
jit.storePtr(JSInterfaceJIT::callFrameRegister, &vm->topCallFrame);
#if CPU(X86)
// Load caller frame's scope chain into this callframe so that whatever we call can
// get to its global data.
jit.emitGetFromCallFrameHeaderPtr(JSStack::CallerFrame, JSInterfaceJIT::regT0);
jit.emitGetFromCallFrameHeaderPtr(JSStack::ScopeChain, JSInterfaceJIT::regT1, JSInterfaceJIT::regT0);
jit.emitPutCellToCallFrameHeader(JSInterfaceJIT::regT1, JSStack::ScopeChain);
jit.peek(JSInterfaceJIT::regT1);
jit.emitPutToCallFrameHeader(JSInterfaceJIT::regT1, JSStack::ReturnPC);
// Calling convention: f(ecx, edx, ...);
// Host function signature: f(ExecState*);
jit.move(JSInterfaceJIT::callFrameRegister, X86Registers::ecx);
jit.subPtr(JSInterfaceJIT::TrustedImm32(16 - sizeof(void*)), JSInterfaceJIT::stackPointerRegister); // Align stack after call.
// call the function
jit.emitGetFromCallFrameHeaderPtr(JSStack::Callee, JSInterfaceJIT::regT1);
jit.loadPtr(JSInterfaceJIT::Address(JSInterfaceJIT::regT1, JSFunction::offsetOfExecutable()), JSInterfaceJIT::regT1);
jit.move(JSInterfaceJIT::regT0, JSInterfaceJIT::callFrameRegister); // Eagerly restore caller frame register to avoid loading from stack.
jit.call(JSInterfaceJIT::Address(JSInterfaceJIT::regT1, executableOffsetToFunction));
jit.addPtr(JSInterfaceJIT::TrustedImm32(16 - sizeof(void*)), JSInterfaceJIT::stackPointerRegister);
#elif CPU(X86_64)
// Load caller frame's scope chain into this callframe so that whatever we call can
// get to its global data.
jit.emitGetFromCallFrameHeaderPtr(JSStack::CallerFrame, JSInterfaceJIT::regT0);
jit.emitGetFromCallFrameHeaderPtr(JSStack::ScopeChain, JSInterfaceJIT::regT1, JSInterfaceJIT::regT0);
jit.emitPutCellToCallFrameHeader(JSInterfaceJIT::regT1, JSStack::ScopeChain);
jit.peek(JSInterfaceJIT::regT1);
jit.emitPutToCallFrameHeader(JSInterfaceJIT::regT1, JSStack::ReturnPC);
#if !OS(WINDOWS)
// Calling convention: f(edi, esi, edx, ecx, ...);
// Host function signature: f(ExecState*);
jit.move(JSInterfaceJIT::callFrameRegister, X86Registers::edi);
jit.subPtr(JSInterfaceJIT::TrustedImm32(16 - sizeof(int64_t)), JSInterfaceJIT::stackPointerRegister); // Align stack after call.
jit.emitGetFromCallFrameHeaderPtr(JSStack::Callee, X86Registers::esi);
jit.loadPtr(JSInterfaceJIT::Address(X86Registers::esi, JSFunction::offsetOfExecutable()), X86Registers::r9);
jit.move(JSInterfaceJIT::regT0, JSInterfaceJIT::callFrameRegister); // Eagerly restore caller frame register to avoid loading from stack.
jit.call(JSInterfaceJIT::Address(X86Registers::r9, executableOffsetToFunction));
jit.addPtr(JSInterfaceJIT::TrustedImm32(16 - sizeof(int64_t)), JSInterfaceJIT::stackPointerRegister);
#else
// Calling convention: f(ecx, edx, r8, r9, ...);
// Host function signature: f(ExecState*);
jit.move(JSInterfaceJIT::callFrameRegister, X86Registers::ecx);
// Leave space for the callee parameter home addresses and align the stack.
jit.subPtr(JSInterfaceJIT::TrustedImm32(4 * sizeof(int64_t) + 16 - sizeof(int64_t)), JSInterfaceJIT::stackPointerRegister);
jit.emitGetFromCallFrameHeaderPtr(JSStack::Callee, X86Registers::edx);
jit.loadPtr(JSInterfaceJIT::Address(X86Registers::edx, JSFunction::offsetOfExecutable()), X86Registers::r9);
jit.move(JSInterfaceJIT::regT0, JSInterfaceJIT::callFrameRegister); // Eagerly restore caller frame register to avoid loading from stack.
jit.call(JSInterfaceJIT::Address(X86Registers::r9, executableOffsetToFunction));
jit.addPtr(JSInterfaceJIT::TrustedImm32(4 * sizeof(int64_t) + 16 - sizeof(int64_t)), JSInterfaceJIT::stackPointerRegister);
#endif
#elif CPU(ARM)
// Load caller frame's scope chain into this callframe so that whatever we call can
// get to its global data.
jit.emitGetFromCallFrameHeaderPtr(JSStack::CallerFrame, JSInterfaceJIT::regT2);
jit.emitGetFromCallFrameHeaderPtr(JSStack::ScopeChain, JSInterfaceJIT::regT1, JSInterfaceJIT::regT2);
jit.emitPutCellToCallFrameHeader(JSInterfaceJIT::regT1, JSStack::ScopeChain);
jit.preserveReturnAddressAfterCall(JSInterfaceJIT::regT3); // Callee preserved
jit.emitPutToCallFrameHeader(JSInterfaceJIT::regT3, JSStack::ReturnPC);
// Calling convention: f(r0 == regT0, r1 == regT1, ...);
// Host function signature: f(ExecState*);
jit.move(JSInterfaceJIT::callFrameRegister, ARMRegisters::r0);
jit.emitGetFromCallFrameHeaderPtr(JSStack::Callee, ARMRegisters::r1);
jit.move(JSInterfaceJIT::regT2, JSInterfaceJIT::callFrameRegister); // Eagerly restore caller frame register to avoid loading from stack.
jit.loadPtr(JSInterfaceJIT::Address(ARMRegisters::r1, JSFunction::offsetOfExecutable()), JSInterfaceJIT::regT2);
jit.call(JSInterfaceJIT::Address(JSInterfaceJIT::regT2, executableOffsetToFunction));
jit.restoreReturnAddressBeforeReturn(JSInterfaceJIT::regT3);
#elif CPU(SH4)
// Load caller frame's scope chain into this callframe so that whatever we call can
// get to its global data.
jit.emitGetFromCallFrameHeaderPtr(JSStack::CallerFrame, JSInterfaceJIT::regT2);
jit.emitGetFromCallFrameHeaderPtr(JSStack::ScopeChain, JSInterfaceJIT::regT1, JSInterfaceJIT::regT2);
jit.emitPutCellToCallFrameHeader(JSInterfaceJIT::regT1, JSStack::ScopeChain);
jit.preserveReturnAddressAfterCall(JSInterfaceJIT::regT3); // Callee preserved
jit.emitPutToCallFrameHeader(JSInterfaceJIT::regT3, JSStack::ReturnPC);
// Calling convention: f(r0 == regT4, r1 == regT5, ...);
// Host function signature: f(ExecState*);
jit.move(JSInterfaceJIT::callFrameRegister, JSInterfaceJIT::regT4);
jit.emitGetFromCallFrameHeaderPtr(JSStack::Callee, JSInterfaceJIT::regT5);
jit.move(JSInterfaceJIT::regT2, JSInterfaceJIT::callFrameRegister); // Eagerly restore caller frame register to avoid loading from stack.
jit.loadPtr(JSInterfaceJIT::Address(JSInterfaceJIT::regT5, JSFunction::offsetOfExecutable()), JSInterfaceJIT::regT2);
jit.call(JSInterfaceJIT::Address(JSInterfaceJIT::regT2, executableOffsetToFunction), JSInterfaceJIT::regT0);
jit.restoreReturnAddressBeforeReturn(JSInterfaceJIT::regT3);
#elif CPU(MIPS)
// Load caller frame's scope chain into this callframe so that whatever we call can
// get to its global data.
jit.emitGetFromCallFrameHeaderPtr(JSStack::CallerFrame, JSInterfaceJIT::regT0);
jit.emitGetFromCallFrameHeaderPtr(JSStack::ScopeChain, JSInterfaceJIT::regT1, JSInterfaceJIT::regT0);
jit.emitPutCellToCallFrameHeader(JSInterfaceJIT::regT1, JSStack::ScopeChain);
jit.preserveReturnAddressAfterCall(JSInterfaceJIT::regT3); // Callee preserved
jit.emitPutToCallFrameHeader(JSInterfaceJIT::regT3, JSStack::ReturnPC);
// Calling convention: f(a0, a1, a2, a3);
// Host function signature: f(ExecState*);
// Allocate stack space for 16 bytes (8-byte aligned)
// 16 bytes (unused) for 4 arguments
jit.subPtr(JSInterfaceJIT::TrustedImm32(16), JSInterfaceJIT::stackPointerRegister);
// Setup arg0
jit.move(JSInterfaceJIT::callFrameRegister, MIPSRegisters::a0);
// Call
jit.emitGetFromCallFrameHeaderPtr(JSStack::Callee, MIPSRegisters::a2);
jit.loadPtr(JSInterfaceJIT::Address(MIPSRegisters::a2, JSFunction::offsetOfExecutable()), JSInterfaceJIT::regT2);
jit.move(JSInterfaceJIT::regT0, JSInterfaceJIT::callFrameRegister); // Eagerly restore caller frame register to avoid loading from stack.
jit.call(JSInterfaceJIT::Address(JSInterfaceJIT::regT2, executableOffsetToFunction));
// Restore stack space
jit.addPtr(JSInterfaceJIT::TrustedImm32(16), JSInterfaceJIT::stackPointerRegister);
jit.restoreReturnAddressBeforeReturn(JSInterfaceJIT::regT3);
#else
#error "JIT not supported on this platform."
UNUSED_PARAM(executableOffsetToFunction);
breakpoint();
#endif
// Check for an exception
#if USE(JSVALUE64)
jit.load64(&(vm->exception), JSInterfaceJIT::regT2);
JSInterfaceJIT::Jump exceptionHandler = jit.branchTest64(JSInterfaceJIT::NonZero, JSInterfaceJIT::regT2);
#else
JSInterfaceJIT::Jump exceptionHandler = jit.branch32(
JSInterfaceJIT::NotEqual,
JSInterfaceJIT::AbsoluteAddress(reinterpret_cast<char*>(&vm->exception) + OBJECT_OFFSETOF(EncodedValueDescriptor, asBits.tag)),
JSInterfaceJIT::TrustedImm32(JSValue::EmptyValueTag));
#endif
// Return.
jit.ret();
// Handle an exception
exceptionHandler.link(&jit);
// Grab the return address.
jit.preserveReturnAddressAfterCall(JSInterfaceJIT::regT1);
jit.move(JSInterfaceJIT::TrustedImmPtr(&vm->exceptionLocation), JSInterfaceJIT::regT2);
jit.storePtr(JSInterfaceJIT::regT1, JSInterfaceJIT::regT2);
jit.storePtr(JSInterfaceJIT::callFrameRegister, &vm->topCallFrame);
jit.move(JSInterfaceJIT::TrustedImmPtr(FunctionPtr(ctiVMThrowTrampolineSlowpath).value()), JSInterfaceJIT::regT1);
jit.jump(JSInterfaceJIT::regT1);
LinkBuffer patchBuffer(*vm, &jit, GLOBAL_THUNK_ID);
return FINALIZE_CODE(patchBuffer, ("native %s trampoline", toCString(kind).data()));
}
MacroAssemblerCodeRef stringLengthTrampolineGenerator(VM* vm)
{
JSInterfaceJIT jit;
#if USE(JSVALUE64)
// Check eax is a string
JSInterfaceJIT::Jump failureCases1 = jit.emitJumpIfNotJSCell(JSInterfaceJIT::regT0);
JSInterfaceJIT::Jump failureCases2 = jit.branchPtr(
JSInterfaceJIT::NotEqual, JSInterfaceJIT::Address(
JSInterfaceJIT::regT0, JSCell::structureOffset()),
JSInterfaceJIT::TrustedImmPtr(vm->stringStructure.get()));
// Checks out okay! - get the length from the Ustring.
jit.load32(
JSInterfaceJIT::Address(JSInterfaceJIT::regT0, JSString::offsetOfLength()),
JSInterfaceJIT::regT0);
JSInterfaceJIT::Jump failureCases3 = jit.branch32(
JSInterfaceJIT::LessThan, JSInterfaceJIT::regT0, JSInterfaceJIT::TrustedImm32(0));
// regT0 contains a 64 bit value (is positive, is zero extended) so we don't need sign extend here.
jit.emitFastArithIntToImmNoCheck(JSInterfaceJIT::regT0, JSInterfaceJIT::regT0);
#else // USE(JSVALUE64)
// regT0 holds payload, regT1 holds tag
JSInterfaceJIT::Jump failureCases1 = jit.branch32(
JSInterfaceJIT::NotEqual, JSInterfaceJIT::regT1,
JSInterfaceJIT::TrustedImm32(JSValue::CellTag));
JSInterfaceJIT::Jump failureCases2 = jit.branchPtr(
JSInterfaceJIT::NotEqual,
JSInterfaceJIT::Address(JSInterfaceJIT::regT0, JSCell::structureOffset()),
JSInterfaceJIT::TrustedImmPtr(vm->stringStructure.get()));
// Checks out okay! - get the length from the Ustring.
jit.load32(
JSInterfaceJIT::Address(JSInterfaceJIT::regT0, JSString::offsetOfLength()),
JSInterfaceJIT::regT2);
JSInterfaceJIT::Jump failureCases3 = jit.branch32(
JSInterfaceJIT::Above, JSInterfaceJIT::regT2, JSInterfaceJIT::TrustedImm32(INT_MAX));
jit.move(JSInterfaceJIT::regT2, JSInterfaceJIT::regT0);
jit.move(JSInterfaceJIT::TrustedImm32(JSValue::Int32Tag), JSInterfaceJIT::regT1);
#endif // USE(JSVALUE64)
jit.ret();
JSInterfaceJIT::Call failureCases1Call = jit.makeTailRecursiveCall(failureCases1);
JSInterfaceJIT::Call failureCases2Call = jit.makeTailRecursiveCall(failureCases2);
JSInterfaceJIT::Call failureCases3Call = jit.makeTailRecursiveCall(failureCases3);
LinkBuffer patchBuffer(*vm, &jit, GLOBAL_THUNK_ID);
patchBuffer.link(failureCases1Call, FunctionPtr(cti_op_get_by_id_string_fail));
patchBuffer.link(failureCases2Call, FunctionPtr(cti_op_get_by_id_string_fail));
patchBuffer.link(failureCases3Call, FunctionPtr(cti_op_get_by_id_string_fail));
return FINALIZE_CODE(patchBuffer, ("string length trampoline"));
}
static MacroAssemblerCodeRef virtualForGenerator(VM* vm, FunctionPtr compile, FunctionPtr notJSFunction, const char* name, CodeSpecializationKind kind)
{
JSInterfaceJIT jit;
JSInterfaceJIT::JumpList slowCase;
#if USE(JSVALUE64)
slowCase.append(jit.emitJumpIfNotJSCell(JSInterfaceJIT::regT0));
#else // USE(JSVALUE64)
slowCase.append(jit.branch32(JSInterfaceJIT::NotEqual, JSInterfaceJIT::regT1, JSInterfaceJIT::TrustedImm32(JSValue::CellTag)));
#endif // USE(JSVALUE64)
slowCase.append(jit.emitJumpIfNotType(JSInterfaceJIT::regT0, JSInterfaceJIT::regT1, JSFunctionType));
// Finish canonical initialization before JS function call.
jit.loadPtr(JSInterfaceJIT::Address(JSInterfaceJIT::regT0, JSFunction::offsetOfScopeChain()), JSInterfaceJIT::regT1);
jit.emitPutCellToCallFrameHeader(JSInterfaceJIT::regT1, JSStack::ScopeChain);
jit.loadPtr(JSInterfaceJIT::Address(JSInterfaceJIT::regT0, JSFunction::offsetOfExecutable()), JSInterfaceJIT::regT2);
JSInterfaceJIT::Jump hasCodeBlock1 = jit.branch32(JSInterfaceJIT::GreaterThanOrEqual, JSInterfaceJIT::Address(JSInterfaceJIT::regT2, FunctionExecutable::offsetOfNumParametersFor(kind)), JSInterfaceJIT::TrustedImm32(0));
jit.preserveReturnAddressAfterCall(JSInterfaceJIT::regT3);
jit.storePtr(JSInterfaceJIT::callFrameRegister, &vm->topCallFrame);
jit.restoreArgumentReference();
JSInterfaceJIT::Call callCompile = jit.call();
jit.restoreReturnAddressBeforeReturn(JSInterfaceJIT::regT3);
jit.loadPtr(JSInterfaceJIT::Address(JSInterfaceJIT::regT0, JSFunction::offsetOfExecutable()), JSInterfaceJIT::regT2);
hasCodeBlock1.link(&jit);
jit.loadPtr(JSInterfaceJIT::Address(JSInterfaceJIT::regT2, FunctionExecutable::offsetOfJITCodeWithArityCheckFor(kind)), JSInterfaceJIT::regT0);
#if !ASSERT_DISABLED
JSInterfaceJIT::Jump ok = jit.branchTestPtr(JSInterfaceJIT::NonZero, JSInterfaceJIT::regT0);
jit.breakpoint();
ok.link(&jit);
#endif
jit.jump(JSInterfaceJIT::regT0);
slowCase.link(&jit);
JSInterfaceJIT::Call callNotJSFunction = generateSlowCaseFor(vm, jit);
LinkBuffer patchBuffer(*vm, &jit, GLOBAL_THUNK_ID);
patchBuffer.link(callCompile, compile);
patchBuffer.link(callNotJSFunction, notJSFunction);
return FINALIZE_CODE(patchBuffer, ("virtual %s trampoline", name));
}