move HandleApiCall builtin to assembly

src/x64/code-stubs-x64.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/v8.h"
 
 #if V8_TARGET_ARCH_X64
 
 #include "src/bootstrapper.h"
 #include "src/code-stubs.h"
@@ skipping 5007 matching lines @@
   // The name handler is counted as an argument.
   StackArgumentsAccessor args(rbp, PropertyCallbackArguments::kArgsLength);
   Operand return_value_operand = args.GetArgumentOperand(
       PropertyCallbackArguments::kArgsLength - 1 -
       PropertyCallbackArguments::kReturnValueOffset);
   CallApiFunctionAndReturn(masm, api_function_address, thunk_ref, getter_arg,
                            kStackSpace, nullptr, return_value_operand, NULL);
 }
 
 
+// Updates holder to the correct api holder.  Map may be trashed.
+static void SignatureCheck(MacroAssembler* masm, Register map, Register holder,
+                           Register signature, Register scratch,
+                           Label* illegal_receiver) {
+  // Loop over hidden prototype chain.
+  Label prototype_chain_loop, prototype_chain_loop_next, legal_receiver;
+  __ bind(&prototype_chain_loop);
+
+  // Verify signature for current map.
+  Register type = scratch;
+  // Requires a constructor of type jsfunction.
+  __ movp(type, FieldOperand(map, Map::kConstructorOffset));
+  __ CmpObjectType(type, JS_FUNCTION_TYPE, kScratchRegister);
+  __ j(not_equal, &prototype_chain_loop_next, Label::kNear);

[jochen (gone - plz use gerrit), 2015/01/21 12:01:39]

I wonder whether we can here already jump to illegal_receiver?

+  // Load shared function data.
+  __ movp(type, FieldOperand(type, JSFunction::kSharedFunctionInfoOffset));
+  __ movp(type, FieldOperand(type, SharedFunctionInfo::kFunctionDataOffset));
+
+  {
+    // Loop over function template info chain, hunting for signature.
+    Label function_template_loop;
+    __ bind(&function_template_loop);
+    // Requires a data of type FunctionTemplateInfo.
+    __ CmpObjectType(type, FUNCTION_TEMPLATE_INFO_TYPE, kScratchRegister);
+    __ j(not_equal, &prototype_chain_loop_next, Label::kNear);
+    __ cmpp(signature, type);
+    __ j(equal, &legal_receiver, Label::kNear);
+    // Incorrect signature, load parent and loop.
+    __ movp(type,
+            FieldOperand(type, FunctionTemplateInfo::kParentTemplateOffset));
+    __ jmp(&function_template_loop, Label::kNear);
+  }
+
+  __ bind(&prototype_chain_loop_next);
+  __ movp(holder, FieldOperand(map, Map::kPrototypeOffset));
+
+  // End of prototype chain walk.
+  __ CompareRoot(holder, Heap::kNullValueRootIndex);
+  __ j(equal, illegal_receiver);
+
+  __ movp(map, FieldOperand(holder, HeapObject::kMapOffset));
+  // End of prototype chain walk.
+  __ testb(FieldOperand(map, Map::kBitFieldOffset),
+           Immediate(1 << Map::kIsHiddenPrototype));
+  __ j(zero, illegal_receiver);
+
+  // TODO(dcarney): this check is probably unnecessary.
+  // Requires a js object map.
+  __ CmpInstanceType(map, FIRST_JS_OBJECT_TYPE);
+  __ j(below, &prototype_chain_loop_next, Label::kNear);
+
+  // Jump up to start of signature check loop for this map.
+  __ jmp(&prototype_chain_loop, Label::kNear);
+
+  // Successful exit.
+  __ bind(&legal_receiver);
+}
+
+
+void JSApiFunctionStub::Generate(MacroAssembler* masm) {
+  // ----------- S t a t e -------------
+  //  -- rax                 : number of arguments excluding receiver
+  //  -- rdi                 : callee
+  //  -- rsi                 : context
+  //  -- rsp[0]              : return address
+  //  -- rsp[8]              : last argument
+  //  -- ...
+  //  -- rsp[8 * argc]       : first argument (argc == rax)
+  //  -- rsp[8 * (argc + 1)] : receiver
+  // -----------------------------------
+
+  StackArgumentsAccessor args(rsp, rax);
+  __ movp(rcx, args.GetReceiverOperand());
+
+  // Update receiver if this is a contextual call.
+  Label set_global_proxy, receiver_correct;
+  __ CompareRoot(rcx, Heap::kUndefinedValueRootIndex);
+  __ j(equal, &set_global_proxy);
+  __ bind(&receiver_correct);
+
+  // Load FunctionTemplateInfo.
+  __ movp(rbx, FieldOperand(rdi, JSFunction::kSharedFunctionInfoOffset));
+  __ movp(rbx, FieldOperand(rbx, SharedFunctionInfo::kFunctionDataOffset));
+
+  // TODO(dcarney): CHECK that !has_call_code implies !has_signature.
+  Label illegal_receiver;
+  if (has_signature()) {
+    // Typecheck.  Update receiver with api holder.
+    __ movp(r8, FieldOperand(rbx, FunctionTemplateInfo::kSignatureOffset));
+    __ movp(rdx, FieldOperand(rcx, HeapObject::kMapOffset));
+    SignatureCheck(masm, rdx, rcx, r8, r9, &illegal_receiver);
+  }
+
+  if (!has_call_code()) {
+    // Return receiver for non c call.  Pop arguments and receiver.
+    __ leap(rbx, Operand(rax, times_pointer_size, 1 * kPointerSize));
+    __ movp(rax, args.GetReceiverOperand());
+    __ PopReturnAddressTo(rcx);
+    __ addp(rsp, rbx);
+    __ jmp(rcx);
+  } else {
+    // c call.
+    __ movp(rbx, FieldOperand(rbx, FunctionTemplateInfo::kCallCodeOffset));
+    // Put call_data and function address in place.
+    __ movp(rdx, FieldOperand(rbx, CallHandlerInfo::kCallbackOffset));
+    __ movp(rdx, FieldOperand(rdx, Foreign::kForeignAddressOffset));
+    __ movp(rbx, FieldOperand(rbx, CallHandlerInfo::kDataOffset));
+    // Jump to stub.
+    // TODO(dcarney): fix abi for CallApiFunctionStub.
+    __ xchgp(rax, rdi);  // Put callee in place.  Put n_args in place.
+    CallApiFunctionStub stub(masm->isolate(), call_data_undefined());
+    __ TailCallStub(&stub);
+  }
+
+  // Deferred code: Replace receiver on stack with global proxy for contextual
+  // calls.
+  __ bind(&set_global_proxy);
+  __ movp(rcx, GlobalObjectOperand());
+  __ movp(rcx, FieldOperand(rcx, GlobalObject::kGlobalProxyOffset));
+  __ movp(args.GetReceiverOperand(), rcx);
+  __ jmp(&receiver_correct);
+
+  if (!illegal_receiver.is_unused()) {
+    // Deferred code: Receiver does not match signature. Throw exception.
+    __ bind(&illegal_receiver);
+
+    // Pop return address, arguments and receiver.
+    __ PopReturnAddressTo(rbx);
+    __ leap(rax, Operand(rax, times_pointer_size, 1 * kPointerSize));
+    __ addp(rsp, rax);
+    __ PushReturnAddressFrom(rbx);
+
+    FrameScope frame(masm, StackFrame::INTERNAL);
+    __ Push(rdi);
+    __ TailCallRuntime(Runtime::kThrowIllegalInvocation, 1, 1);
+  }
+}
+
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64