| // Copyright 2009 the V8 project authors. All rights reserved. |
| // Redistribution and use in source and binary forms, with or without |
| // modification, are permitted provided that the following conditions are |
| // met: |
| // |
| // * Redistributions of source code must retain the above copyright |
| // notice, this list of conditions and the following disclaimer. |
| // * 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. |
| // * Neither the name of Google Inc. nor the names of its |
| // contributors may be used to endorse or promote products derived |
| // from this software without specific prior written permission. |
| // |
| // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| // "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 THE COPYRIGHT |
| // OWNER 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 "v8.h" |
| #include "codegen-inl.h" |
| #include "macro-assembler.h" |
| |
| namespace v8 { |
| namespace internal { |
| |
| #define __ ACCESS_MASM(masm) |
| |
| void Builtins::Generate_Adaptor(MacroAssembler* masm, CFunctionId id) { |
| // TODO(1238487): Don't pass the function in a static variable. |
| ExternalReference passed = ExternalReference::builtin_passed_function(); |
| __ movq(kScratchRegister, passed.address(), RelocInfo::EXTERNAL_REFERENCE); |
| __ movq(Operand(kScratchRegister, 0), rdi); |
| |
| // The actual argument count has already been loaded into register |
| // rax, but JumpToBuiltin expects rax to contain the number of |
| // arguments including the receiver. |
| __ incq(rax); |
| __ JumpToBuiltin(ExternalReference(id)); |
| } |
| |
| |
| static void EnterArgumentsAdaptorFrame(MacroAssembler* masm) { |
| __ push(rbp); |
| __ movq(rbp, rsp); |
| |
| // Store the arguments adaptor context sentinel. |
| __ push(Immediate(ArgumentsAdaptorFrame::SENTINEL)); |
| |
| // Push the function on the stack. |
| __ push(rdi); |
| |
| // Preserve the number of arguments on the stack. Must preserve both |
| // rax and rbx because these registers are used when copying the |
| // arguments and the receiver. |
| ASSERT(kSmiTagSize == 1); |
| __ lea(rcx, Operand(rax, rax, times_1, kSmiTag)); |
| __ push(rcx); |
| } |
| |
| |
| static void LeaveArgumentsAdaptorFrame(MacroAssembler* masm) { |
| // Retrieve the number of arguments from the stack. Number is a Smi. |
| __ movq(rbx, Operand(rbp, ArgumentsAdaptorFrameConstants::kLengthOffset)); |
| |
| // Leave the frame. |
| __ movq(rsp, rbp); |
| __ pop(rbp); |
| |
| // Remove caller arguments from the stack. |
| // rbx holds a Smi, so we convery to dword offset by multiplying by 4. |
| ASSERT_EQ(kSmiTagSize, 1 && kSmiTag == 0); |
| ASSERT_EQ(kPointerSize, (1 << kSmiTagSize) * 4); |
| __ pop(rcx); |
| __ lea(rsp, Operand(rsp, rbx, times_4, 1 * kPointerSize)); // 1 ~ receiver |
| __ push(rcx); |
| } |
| |
| |
| void Builtins::Generate_ArgumentsAdaptorTrampoline(MacroAssembler* masm) { |
| // ----------- S t a t e ------------- |
| // -- rax : actual number of arguments |
| // -- rbx : expected number of arguments |
| // -- rdx : code entry to call |
| // ----------------------------------- |
| |
| Label invoke, dont_adapt_arguments; |
| __ IncrementCounter(&Counters::arguments_adaptors, 1); |
| |
| Label enough, too_few; |
| __ cmpq(rax, rbx); |
| __ j(less, &too_few); |
| __ cmpq(rbx, Immediate(SharedFunctionInfo::kDontAdaptArgumentsSentinel)); |
| __ j(equal, &dont_adapt_arguments); |
| |
| { // Enough parameters: Actual >= expected. |
| __ bind(&enough); |
| EnterArgumentsAdaptorFrame(masm); |
| |
| // Copy receiver and all expected arguments. |
| const int offset = StandardFrameConstants::kCallerSPOffset; |
| __ lea(rax, Operand(rbp, rax, times_pointer_size, offset)); |
| __ movq(rcx, Immediate(-1)); // account for receiver |
| |
| Label copy; |
| __ bind(©); |
| __ incq(rcx); |
| __ push(Operand(rax, 0)); |
| __ subq(rax, Immediate(kPointerSize)); |
| __ cmpq(rcx, rbx); |
| __ j(less, ©); |
| __ jmp(&invoke); |
| } |
| |
| { // Too few parameters: Actual < expected. |
| __ bind(&too_few); |
| EnterArgumentsAdaptorFrame(masm); |
| |
| // Copy receiver and all actual arguments. |
| const int offset = StandardFrameConstants::kCallerSPOffset; |
| __ lea(rdi, Operand(rbp, rax, times_pointer_size, offset)); |
| __ movq(rcx, Immediate(-1)); // account for receiver |
| |
| Label copy; |
| __ bind(©); |
| __ incq(rcx); |
| __ push(Operand(rdi, 0)); |
| __ subq(rdi, Immediate(kPointerSize)); |
| __ cmpq(rcx, rax); |
| __ j(less, ©); |
| |
| // Fill remaining expected arguments with undefined values. |
| Label fill; |
| __ movq(kScratchRegister, |
| Factory::undefined_value(), |
| RelocInfo::EMBEDDED_OBJECT); |
| __ bind(&fill); |
| __ incq(rcx); |
| __ push(kScratchRegister); |
| __ cmpq(rcx, rbx); |
| __ j(less, &fill); |
| |
| // Restore function pointer. |
| __ movq(rdi, Operand(rbp, JavaScriptFrameConstants::kFunctionOffset)); |
| } |
| |
| // Call the entry point. |
| __ bind(&invoke); |
| __ call(rdx); |
| |
| // Leave frame and return. |
| LeaveArgumentsAdaptorFrame(masm); |
| __ ret(0); |
| |
| // ------------------------------------------- |
| // Dont adapt arguments. |
| // ------------------------------------------- |
| __ bind(&dont_adapt_arguments); |
| __ jmp(rdx); |
| } |
| |
| |
| void Builtins::Generate_FunctionCall(MacroAssembler* masm) { |
| // Stack Layout: |
| // rsp: return address |
| // +1: Argument n |
| // +2: Argument n-1 |
| // ... |
| // +n: Argument 1 = receiver |
| // +n+1: Argument 0 = function to call |
| // |
| // rax contains the number of arguments, n, not counting the function. |
| // |
| // 1. Make sure we have at least one argument. |
| { Label done; |
| __ testq(rax, rax); |
| __ j(not_zero, &done); |
| __ pop(rbx); |
| __ Push(Factory::undefined_value()); |
| __ push(rbx); |
| __ incq(rax); |
| __ bind(&done); |
| } |
| |
| // 2. Get the function to call from the stack. |
| { Label done, non_function, function; |
| // The function to call is at position n+1 on the stack. |
| __ movq(rdi, Operand(rsp, rax, times_pointer_size, +1 * kPointerSize)); |
| __ testl(rdi, Immediate(kSmiTagMask)); |
| __ j(zero, &non_function); |
| __ CmpObjectType(rdi, JS_FUNCTION_TYPE, rcx); |
| __ j(equal, &function); |
| |
| // Non-function called: Clear the function to force exception. |
| __ bind(&non_function); |
| __ xor_(rdi, rdi); |
| __ jmp(&done); |
| |
| // Function called: Change context eagerly to get the right global object. |
| __ bind(&function); |
| __ movq(rsi, FieldOperand(rdi, JSFunction::kContextOffset)); |
| |
| __ bind(&done); |
| } |
| |
| // 3. Make sure first argument is an object; convert if necessary. |
| { Label call_to_object, use_global_receiver, patch_receiver, done; |
| __ movq(rbx, Operand(rsp, rax, times_pointer_size, 0)); |
| |
| __ testl(rbx, Immediate(kSmiTagMask)); |
| __ j(zero, &call_to_object); |
| |
| __ Cmp(rbx, Factory::null_value()); |
| __ j(equal, &use_global_receiver); |
| __ Cmp(rbx, Factory::undefined_value()); |
| __ j(equal, &use_global_receiver); |
| |
| __ CmpObjectType(rbx, FIRST_JS_OBJECT_TYPE, rcx); |
| __ j(below, &call_to_object); |
| __ CmpInstanceType(rcx, LAST_JS_OBJECT_TYPE); |
| __ j(below_equal, &done); |
| |
| __ bind(&call_to_object); |
| __ EnterInternalFrame(); // preserves rax, rbx, rdi |
| |
| // Store the arguments count on the stack (smi tagged). |
| ASSERT(kSmiTag == 0); |
| __ shl(rax, Immediate(kSmiTagSize)); |
| __ push(rax); |
| |
| __ push(rdi); // save edi across the call |
| __ push(rbx); |
| __ InvokeBuiltin(Builtins::TO_OBJECT, CALL_FUNCTION); |
| __ movq(rbx, rax); |
| __ pop(rdi); // restore edi after the call |
| |
| // Get the arguments count and untag it. |
| __ pop(rax); |
| __ shr(rax, Immediate(kSmiTagSize)); |
| |
| __ LeaveInternalFrame(); |
| __ jmp(&patch_receiver); |
| |
| // Use the global receiver object from the called function as the receiver. |
| __ bind(&use_global_receiver); |
| const int kGlobalIndex = |
| Context::kHeaderSize + Context::GLOBAL_INDEX * kPointerSize; |
| __ movq(rbx, FieldOperand(rsi, kGlobalIndex)); |
| __ movq(rbx, FieldOperand(rbx, GlobalObject::kGlobalReceiverOffset)); |
| |
| __ bind(&patch_receiver); |
| __ movq(Operand(rsp, rax, times_pointer_size, 0), rbx); |
| |
| __ bind(&done); |
| } |
| |
| // 4. Shift stuff one slot down the stack. |
| { Label loop; |
| __ lea(rcx, Operand(rax, +1)); // +1 ~ copy receiver too |
| __ bind(&loop); |
| __ movq(rbx, Operand(rsp, rcx, times_pointer_size, 0)); |
| __ movq(Operand(rsp, rcx, times_pointer_size, 1 * kPointerSize), rbx); |
| __ decq(rcx); |
| __ j(not_zero, &loop); |
| } |
| |
| // 5. Remove TOS (copy of last arguments), but keep return address. |
| __ pop(rbx); |
| __ pop(rcx); |
| __ push(rbx); |
| __ decq(rax); |
| |
| // 6. Check that function really was a function and get the code to |
| // call from the function and check that the number of expected |
| // arguments matches what we're providing. |
| { Label invoke, trampoline; |
| __ testq(rdi, rdi); |
| __ j(not_zero, &invoke); |
| __ xor_(rbx, rbx); |
| __ GetBuiltinEntry(rdx, Builtins::CALL_NON_FUNCTION); |
| __ bind(&trampoline); |
| __ Jump(Handle<Code>(builtin(ArgumentsAdaptorTrampoline)), |
| RelocInfo::CODE_TARGET); |
| |
| __ bind(&invoke); |
| __ movq(rdx, FieldOperand(rdi, JSFunction::kSharedFunctionInfoOffset)); |
| __ movsxlq(rbx, |
| FieldOperand(rdx, SharedFunctionInfo::kFormalParameterCountOffset)); |
| __ movq(rdx, FieldOperand(rdx, SharedFunctionInfo::kCodeOffset)); |
| __ lea(rdx, FieldOperand(rdx, Code::kHeaderSize)); |
| __ cmpq(rax, rbx); |
| __ j(not_equal, &trampoline); |
| } |
| |
| // 7. Jump (tail-call) to the code in register edx without checking arguments. |
| ParameterCount expected(0); |
| __ InvokeCode(rdx, expected, expected, JUMP_FUNCTION); |
| } |
| |
| |
| void Builtins::Generate_FunctionApply(MacroAssembler* masm) { |
| // Stack at entry: |
| // rsp: return address |
| // rsp+8: arguments |
| // rsp+16: receiver ("this") |
| // rsp+24: function |
| __ EnterInternalFrame(); |
| // Stack frame: |
| // rbp: Old base pointer |
| // rbp[1]: return address |
| // rbp[2]: function arguments |
| // rbp[3]: receiver |
| // rbp[4]: function |
| static const int kArgumentsOffset = 2 * kPointerSize; |
| static const int kReceiverOffset = 3 * kPointerSize; |
| static const int kFunctionOffset = 4 * kPointerSize; |
| __ push(Operand(rbp, kFunctionOffset)); |
| __ push(Operand(rbp, kArgumentsOffset)); |
| __ InvokeBuiltin(Builtins::APPLY_PREPARE, CALL_FUNCTION); |
| |
| if (FLAG_check_stack) { |
| // We need to catch preemptions right here, otherwise an unlucky preemption |
| // could show up as a failed apply. |
| Label retry_preemption; |
| Label no_preemption; |
| __ bind(&retry_preemption); |
| ExternalReference stack_guard_limit = |
| ExternalReference::address_of_stack_guard_limit(); |
| __ movq(kScratchRegister, stack_guard_limit); |
| __ movq(rcx, rsp); |
| __ subq(rcx, Operand(kScratchRegister, 0)); |
| // rcx contains the difference between the stack limit and the stack top. |
| // We use it below to check that there is enough room for the arguments. |
| __ j(above, &no_preemption); |
| |
| // Preemption! |
| // Because runtime functions always remove the receiver from the stack, we |
| // have to fake one to avoid underflowing the stack. |
| __ push(rax); |
| __ push(Immediate(Smi::FromInt(0))); |
| |
| // Do call to runtime routine. |
| __ CallRuntime(Runtime::kStackGuard, 1); |
| __ pop(rax); |
| __ jmp(&retry_preemption); |
| |
| __ bind(&no_preemption); |
| |
| Label okay; |
| // Make rdx the space we need for the array when it is unrolled onto the |
| // stack. |
| __ movq(rdx, rax); |
| __ shl(rdx, Immediate(kPointerSizeLog2 - kSmiTagSize)); |
| __ cmpq(rcx, rdx); |
| __ j(greater, &okay); |
| |
| // Too bad: Out of stack space. |
| __ push(Operand(rbp, kFunctionOffset)); |
| __ push(rax); |
| __ InvokeBuiltin(Builtins::APPLY_OVERFLOW, CALL_FUNCTION); |
| __ bind(&okay); |
| } |
| |
| // Push current index and limit. |
| const int kLimitOffset = |
| StandardFrameConstants::kExpressionsOffset - 1 * kPointerSize; |
| const int kIndexOffset = kLimitOffset - 1 * kPointerSize; |
| __ push(rax); // limit |
| __ push(Immediate(0)); // index |
| |
| // Change context eagerly to get the right global object if |
| // necessary. |
| __ movq(rdi, Operand(rbp, kFunctionOffset)); |
| __ movq(rsi, FieldOperand(rdi, JSFunction::kContextOffset)); |
| |
| // Compute the receiver. |
| Label call_to_object, use_global_receiver, push_receiver; |
| __ movq(rbx, Operand(rbp, kReceiverOffset)); |
| __ testl(rbx, Immediate(kSmiTagMask)); |
| __ j(zero, &call_to_object); |
| __ Cmp(rbx, Factory::null_value()); |
| __ j(equal, &use_global_receiver); |
| __ Cmp(rbx, Factory::undefined_value()); |
| __ j(equal, &use_global_receiver); |
| |
| // If given receiver is already a JavaScript object then there's no |
| // reason for converting it. |
| __ CmpObjectType(rbx, FIRST_JS_OBJECT_TYPE, rcx); |
| __ j(below, &call_to_object); |
| __ CmpInstanceType(rcx, LAST_JS_OBJECT_TYPE); |
| __ j(below_equal, &push_receiver); |
| |
| // Convert the receiver to an object. |
| __ bind(&call_to_object); |
| __ push(rbx); |
| __ InvokeBuiltin(Builtins::TO_OBJECT, CALL_FUNCTION); |
| __ movq(rbx, rax); |
| __ jmp(&push_receiver); |
| |
| // Use the current global receiver object as the receiver. |
| __ bind(&use_global_receiver); |
| const int kGlobalOffset = |
| Context::kHeaderSize + Context::GLOBAL_INDEX * kPointerSize; |
| __ movq(rbx, FieldOperand(rsi, kGlobalOffset)); |
| __ movq(rbx, FieldOperand(rbx, GlobalObject::kGlobalReceiverOffset)); |
| |
| // Push the receiver. |
| __ bind(&push_receiver); |
| __ push(rbx); |
| |
| // Copy all arguments from the array to the stack. |
| Label entry, loop; |
| __ movq(rax, Operand(rbp, kIndexOffset)); |
| __ jmp(&entry); |
| __ bind(&loop); |
| __ movq(rcx, Operand(rbp, kArgumentsOffset)); // load arguments |
| __ push(rcx); |
| __ push(rax); |
| |
| // Use inline caching to speed up access to arguments. |
| Handle<Code> ic(Builtins::builtin(Builtins::KeyedLoadIC_Initialize)); |
| __ Call(ic, RelocInfo::CODE_TARGET); |
| // It is important that we do not have a test instruction after the |
| // call. A test instruction after the call is used to indicate that |
| // we have generated an inline version of the keyed load. In this |
| // case, we know that we are not generating a test instruction next. |
| |
| // Remove IC arguments from the stack and push the nth argument. |
| __ addq(rsp, Immediate(2 * kPointerSize)); |
| __ push(rax); |
| |
| // Update the index on the stack and in register rax. |
| __ movq(rax, Operand(rbp, kIndexOffset)); |
| __ addq(rax, Immediate(Smi::FromInt(1))); |
| __ movq(Operand(rbp, kIndexOffset), rax); |
| |
| __ bind(&entry); |
| __ cmpq(rax, Operand(rbp, kLimitOffset)); |
| __ j(not_equal, &loop); |
| |
| // Invoke the function. |
| ParameterCount actual(rax); |
| __ shr(rax, Immediate(kSmiTagSize)); |
| __ movq(rdi, Operand(rbp, kFunctionOffset)); |
| __ InvokeFunction(rdi, actual, CALL_FUNCTION); |
| |
| __ LeaveInternalFrame(); |
| __ ret(3 * kPointerSize); // remove function, receiver, and arguments |
| } |
| |
| |
| void Builtins::Generate_JSConstructCall(MacroAssembler* masm) { |
| // ----------- S t a t e ------------- |
| // -- rax: number of arguments |
| // -- rdi: constructor function |
| // ----------------------------------- |
| |
| Label non_function_call; |
| // Check that function is not a smi. |
| __ testl(rdi, Immediate(kSmiTagMask)); |
| __ j(zero, &non_function_call); |
| // Check that function is a JSFunction. |
| __ CmpObjectType(rdi, JS_FUNCTION_TYPE, rcx); |
| __ j(not_equal, &non_function_call); |
| |
| // Jump to the function-specific construct stub. |
| __ movq(rbx, FieldOperand(rdi, JSFunction::kSharedFunctionInfoOffset)); |
| __ movq(rbx, FieldOperand(rbx, SharedFunctionInfo::kConstructStubOffset)); |
| __ lea(rbx, FieldOperand(rbx, Code::kHeaderSize)); |
| __ jmp(rbx); |
| |
| // edi: called object |
| // eax: number of arguments |
| __ bind(&non_function_call); |
| |
| // Set expected number of arguments to zero (not changing eax). |
| __ movq(rbx, Immediate(0)); |
| __ GetBuiltinEntry(rdx, Builtins::CALL_NON_FUNCTION_AS_CONSTRUCTOR); |
| __ Jump(Handle<Code>(builtin(ArgumentsAdaptorTrampoline)), |
| RelocInfo::CODE_TARGET); |
| } |
| |
| |
| void Builtins::Generate_JSConstructStubGeneric(MacroAssembler* masm) { |
| // Enter a construct frame. |
| __ EnterConstructFrame(); |
| |
| // Store a smi-tagged arguments count on the stack. |
| __ shl(rax, Immediate(kSmiTagSize)); |
| __ push(rax); |
| |
| // Push the function to invoke on the stack. |
| __ push(rdi); |
| |
| // Try to allocate the object without transitioning into C code. If any of the |
| // preconditions is not met, the code bails out to the runtime call. |
| Label rt_call, allocated; |
| if (FLAG_inline_new) { |
| Label undo_allocation; |
| // TODO(X64): Enable debugger support, using debug_step_in_fp. |
| |
| // Verified that the constructor is a JSFunction. |
| // Load the initial map and verify that it is in fact a map. |
| // rdi: constructor |
| __ movq(rax, FieldOperand(rdi, JSFunction::kPrototypeOrInitialMapOffset)); |
| // Will both indicate a NULL and a Smi |
| __ testl(rax, Immediate(kSmiTagMask)); |
| __ j(zero, &rt_call); |
| // rdi: constructor |
| // rax: initial map (if proven valid below) |
| __ CmpObjectType(rax, MAP_TYPE, rbx); |
| __ j(not_equal, &rt_call); |
| |
| // Check that the constructor is not constructing a JSFunction (see comments |
| // in Runtime_NewObject in runtime.cc). In which case the initial map's |
| // instance type would be JS_FUNCTION_TYPE. |
| // rdi: constructor |
| // rax: initial map |
| __ CmpInstanceType(rax, JS_FUNCTION_TYPE); |
| __ j(equal, &rt_call); |
| |
| // Now allocate the JSObject on the heap. |
| __ movzxbq(rdi, FieldOperand(rax, Map::kInstanceSizeOffset)); |
| __ shl(rdi, Immediate(kPointerSizeLog2)); |
| // rdi: size of new object |
| // Make sure that the maximum heap object size will never cause us |
| // problem here, because it is always greater than the maximum |
| // instance size that can be represented in a byte. |
| ASSERT(Heap::MaxObjectSizeInPagedSpace() >= (1 << kBitsPerByte)); |
| ExternalReference new_space_allocation_top = |
| ExternalReference::new_space_allocation_top_address(); |
| __ movq(kScratchRegister, new_space_allocation_top); |
| __ movq(rbx, Operand(kScratchRegister, 0)); |
| __ addq(rdi, rbx); // Calculate new top |
| ExternalReference new_space_allocation_limit = |
| ExternalReference::new_space_allocation_limit_address(); |
| __ movq(kScratchRegister, new_space_allocation_limit); |
| __ cmpq(rdi, Operand(kScratchRegister, 0)); |
| __ j(above_equal, &rt_call); |
| // Allocated the JSObject, now initialize the fields. |
| // rax: initial map |
| // rbx: JSObject (not HeapObject tagged - the actual address). |
| // rdi: start of next object |
| __ movq(Operand(rbx, JSObject::kMapOffset), rax); |
| __ Move(rcx, Factory::empty_fixed_array()); |
| __ movq(Operand(rbx, JSObject::kPropertiesOffset), rcx); |
| __ movq(Operand(rbx, JSObject::kElementsOffset), rcx); |
| // Set extra fields in the newly allocated object. |
| // rax: initial map |
| // rbx: JSObject |
| // rdi: start of next object |
| { Label loop, entry; |
| __ Move(rdx, Factory::undefined_value()); |
| __ lea(rcx, Operand(rbx, JSObject::kHeaderSize)); |
| __ jmp(&entry); |
| __ bind(&loop); |
| __ movq(Operand(rcx, 0), rdx); |
| __ addq(rcx, Immediate(kPointerSize)); |
| __ bind(&entry); |
| __ cmpq(rcx, rdi); |
| __ j(less, &loop); |
| } |
| |
| // Mostly done with the JSObject. Add the heap tag and store the new top, so |
| // that we can continue and jump into the continuation code at any time from |
| // now on. Any failures need to undo the setting of the new top, so that the |
| // heap is in a consistent state and verifiable. |
| // rax: initial map |
| // rbx: JSObject |
| // rdi: start of next object |
| __ or_(rbx, Immediate(kHeapObjectTag)); |
| __ movq(kScratchRegister, new_space_allocation_top); |
| __ movq(Operand(kScratchRegister, 0), rdi); |
| |
| // Check if a non-empty properties array is needed. |
| // Allocate and initialize a FixedArray if it is. |
| // rax: initial map |
| // rbx: JSObject |
| // rdi: start of next object |
| __ movzxbq(rdx, FieldOperand(rax, Map::kUnusedPropertyFieldsOffset)); |
| __ movzxbq(rcx, FieldOperand(rax, Map::kInObjectPropertiesOffset)); |
| // Calculate unused properties past the end of the in-object properties. |
| __ subq(rdx, rcx); |
| // Done if no extra properties are to be allocated. |
| __ j(zero, &allocated); |
| |
| // Scale the number of elements by pointer size and add the header for |
| // FixedArrays to the start of the next object calculation from above. |
| // rbx: JSObject |
| // rdi: start of next object (will be start of FixedArray) |
| // rdx: number of elements in properties array |
| ASSERT(Heap::MaxObjectSizeInPagedSpace() > |
| (FixedArray::kHeaderSize + 255*kPointerSize)); |
| __ lea(rax, Operand(rdi, rdx, times_pointer_size, FixedArray::kHeaderSize)); |
| __ movq(kScratchRegister, new_space_allocation_limit); |
| __ cmpq(rax, Operand(kScratchRegister, 0)); |
| __ j(above_equal, &undo_allocation); |
| __ store_rax(new_space_allocation_top); |
| |
| // Initialize the FixedArray. |
| // rbx: JSObject |
| // rdi: FixedArray |
| // rdx: number of elements |
| // rax: start of next object |
| __ Move(rcx, Factory::fixed_array_map()); |
| __ movq(Operand(rdi, JSObject::kMapOffset), rcx); // setup the map |
| __ movl(Operand(rdi, FixedArray::kLengthOffset), rdx); // and length |
| |
| // Initialize the fields to undefined. |
| // rbx: JSObject |
| // rdi: FixedArray |
| // rax: start of next object |
| // rdx: number of elements |
| { Label loop, entry; |
| __ Move(rdx, Factory::undefined_value()); |
| __ lea(rcx, Operand(rdi, FixedArray::kHeaderSize)); |
| __ jmp(&entry); |
| __ bind(&loop); |
| __ movq(Operand(rcx, 0), rdx); |
| __ addq(rcx, Immediate(kPointerSize)); |
| __ bind(&entry); |
| __ cmpq(rcx, rax); |
| __ j(below, &loop); |
| } |
| |
| // Store the initialized FixedArray into the properties field of |
| // the JSObject |
| // rbx: JSObject |
| // rdi: FixedArray |
| __ or_(rdi, Immediate(kHeapObjectTag)); // add the heap tag |
| __ movq(FieldOperand(rbx, JSObject::kPropertiesOffset), rdi); |
| |
| |
| // Continue with JSObject being successfully allocated |
| // rbx: JSObject |
| __ jmp(&allocated); |
| |
| // Undo the setting of the new top so that the heap is verifiable. For |
| // example, the map's unused properties potentially do not match the |
| // allocated objects unused properties. |
| // rbx: JSObject (previous new top) |
| __ bind(&undo_allocation); |
| __ xor_(rbx, Immediate(kHeapObjectTag)); // clear the heap tag |
| __ movq(kScratchRegister, new_space_allocation_top); |
| __ movq(Operand(kScratchRegister, 0), rbx); |
| } |
| |
| // Allocate the new receiver object using the runtime call. |
| // rdi: function (constructor) |
| __ bind(&rt_call); |
| // Must restore rdi (constructor) before calling runtime. |
| __ movq(rdi, Operand(rsp, 0)); |
| __ push(rdi); |
| __ CallRuntime(Runtime::kNewObject, 1); |
| __ movq(rbx, rax); // store result in rbx |
| |
| // New object allocated. |
| // rbx: newly allocated object |
| __ bind(&allocated); |
| // Retrieve the function from the stack. |
| __ pop(rdi); |
| |
| // Retrieve smi-tagged arguments count from the stack. |
| __ movq(rax, Operand(rsp, 0)); |
| __ shr(rax, Immediate(kSmiTagSize)); |
| |
| // Push the allocated receiver to the stack. We need two copies |
| // because we may have to return the original one and the calling |
| // conventions dictate that the called function pops the receiver. |
| __ push(rbx); |
| __ push(rbx); |
| |
| // Setup pointer to last argument. |
| __ lea(rbx, Operand(rbp, StandardFrameConstants::kCallerSPOffset)); |
| |
| // Copy arguments and receiver to the expression stack. |
| Label loop, entry; |
| __ movq(rcx, rax); |
| __ jmp(&entry); |
| __ bind(&loop); |
| __ push(Operand(rbx, rcx, times_pointer_size, 0)); |
| __ bind(&entry); |
| __ decq(rcx); |
| __ j(greater_equal, &loop); |
| |
| // Call the function. |
| ParameterCount actual(rax); |
| __ InvokeFunction(rdi, actual, CALL_FUNCTION); |
| |
| // Restore context from the frame. |
| __ movq(rsi, Operand(rbp, StandardFrameConstants::kContextOffset)); |
| |
| // If the result is an object (in the ECMA sense), we should get rid |
| // of the receiver and use the result; see ECMA-262 section 13.2.2-7 |
| // on page 74. |
| Label use_receiver, exit; |
| // If the result is a smi, it is *not* an object in the ECMA sense. |
| __ testl(rax, Immediate(kSmiTagMask)); |
| __ j(zero, &use_receiver); |
| |
| // If the type of the result (stored in its map) is less than |
| // FIRST_JS_OBJECT_TYPE, it is not an object in the ECMA sense. |
| __ CmpObjectType(rax, FIRST_JS_OBJECT_TYPE, rcx); |
| __ j(above_equal, &exit); |
| |
| // Throw away the result of the constructor invocation and use the |
| // on-stack receiver as the result. |
| __ bind(&use_receiver); |
| __ movq(rax, Operand(rsp, 0)); |
| |
| // Restore the arguments count and leave the construct frame. |
| __ bind(&exit); |
| __ movq(rbx, Operand(rsp, kPointerSize)); // get arguments count |
| __ LeaveConstructFrame(); |
| |
| // Remove caller arguments from the stack and return. |
| ASSERT(kSmiTagSize == 1 && kSmiTag == 0); |
| __ pop(rcx); |
| __ lea(rsp, Operand(rsp, rbx, times_4, 1 * kPointerSize)); // 1 ~ receiver |
| __ push(rcx); |
| __ ret(0); |
| } |
| |
| |
| static void Generate_JSEntryTrampolineHelper(MacroAssembler* masm, |
| bool is_construct) { |
| // Expects five C++ function parameters. |
| // - Address entry (ignored) |
| // - JSFunction* function ( |
| // - Object* receiver |
| // - int argc |
| // - Object*** argv |
| // (see Handle::Invoke in execution.cc). |
| |
| // Platform specific argument handling. After this, the stack contains |
| // an internal frame and the pushed function and receiver, and |
| // register rax and rbx holds the argument count and argument array, |
| // while rdi holds the function pointer and rsi the context. |
| #ifdef __MSVC__ |
| // MSVC parameters in: |
| // rcx : entry (ignored) |
| // rdx : function |
| // r8 : receiver |
| // r9 : argc |
| // [rsp+0x20] : argv |
| |
| // Clear the context before we push it when entering the JS frame. |
| __ xor_(rsi, rsi); |
| // Enter an internal frame. |
| __ EnterInternalFrame(); |
| |
| // Load the function context into rsi. |
| __ movq(rsi, FieldOperand(rdx, JSFunction::kContextOffset)); |
| |
| // Push the function and the receiver onto the stack. |
| __ push(rdx); |
| __ push(r8); |
| |
| // Load the number of arguments and setup pointer to the arguments. |
| __ movq(rax, r9); |
| // Load the previous frame pointer to access C argument on stack |
| __ movq(kScratchRegister, Operand(rbp, 0)); |
| __ movq(rbx, Operand(kScratchRegister, EntryFrameConstants::kArgvOffset)); |
| // Load the function pointer into rdi. |
| __ movq(rdi, rdx); |
| #else // !defined(__MSVC__) |
| // GCC parameters in: |
| // rdi : entry (ignored) |
| // rsi : function |
| // rdx : receiver |
| // rcx : argc |
| // r8 : argv |
| |
| __ movq(rdi, rsi); |
| // rdi : function |
| |
| // Clear the context before we push it when entering the JS frame. |
| __ xor_(rsi, rsi); |
| // Enter an internal frame. |
| __ EnterInternalFrame(); |
| |
| // Push the function and receiver and setup the context. |
| __ push(rdi); |
| __ push(rdx); |
| __ movq(rsi, FieldOperand(rdi, JSFunction::kContextOffset)); |
| |
| // Load the number of arguments and setup pointer to the arguments. |
| __ movq(rax, rcx); |
| __ movq(rbx, r8); |
| #endif // __MSVC__ |
| // Current stack contents: |
| // [rsp + 2 * kPointerSize ... ]: Internal frame |
| // [rsp + kPointerSize] : function |
| // [rsp] : receiver |
| // Current register contents: |
| // rax : argc |
| // rbx : argv |
| // rsi : context |
| // rdi : function |
| |
| // Copy arguments to the stack in a loop. |
| // Register rbx points to array of pointers to handle locations. |
| // Push the values of these handles. |
| Label loop, entry; |
| __ xor_(rcx, rcx); // Set loop variable to 0. |
| __ jmp(&entry); |
| __ bind(&loop); |
| __ movq(kScratchRegister, Operand(rbx, rcx, times_pointer_size, 0)); |
| __ push(Operand(kScratchRegister, 0)); // dereference handle |
| __ addq(rcx, Immediate(1)); |
| __ bind(&entry); |
| __ cmpq(rcx, rax); |
| __ j(not_equal, &loop); |
| |
| // Invoke the code. |
| if (is_construct) { |
| // Expects rdi to hold function pointer. |
| __ movq(kScratchRegister, |
| Handle<Code>(Builtins::builtin(Builtins::JSConstructCall)), |
| RelocInfo::CODE_TARGET); |
| __ call(kScratchRegister); |
| } else { |
| ParameterCount actual(rax); |
| // Function must be in rdi. |
| __ InvokeFunction(rdi, actual, CALL_FUNCTION); |
| } |
| |
| // Exit the JS frame. Notice that this also removes the empty |
| // context and the function left on the stack by the code |
| // invocation. |
| __ LeaveInternalFrame(); |
| // TODO(X64): Is argument correct? Is there a receiver to remove? |
| __ ret(1 * kPointerSize); // remove receiver |
| } |
| |
| |
| void Builtins::Generate_JSEntryTrampoline(MacroAssembler* masm) { |
| Generate_JSEntryTrampolineHelper(masm, false); |
| } |
| |
| |
| void Builtins::Generate_JSConstructEntryTrampoline(MacroAssembler* masm) { |
| Generate_JSEntryTrampolineHelper(masm, true); |
| } |
| |
| } } // namespace v8::internal |