X64: Implement CEntryStub and JSEntryTrampoline.

src/x64/builtins-x64.cc

 // Copyright 2009 the V8 project authors. All rights reserved.
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 #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,
                                 Builtins::CFunctionId id) {
   masm->int3();  // UNIMPLEMENTED.
 }
 
 void Builtins::Generate_ArgumentsAdaptorTrampoline(MacroAssembler* masm) {
   masm->int3();  // UNIMPLEMENTED.
 }
 
 void Builtins::Generate_FunctionApply(MacroAssembler* masm) {
   masm->int3();  // UNIMPLEMENTED.
 }
 
 void Builtins::Generate_FunctionCall(MacroAssembler* masm) {
   masm->int3();  // UNIMPLEMENTED.
 }
 
 void Builtins::Generate_JSConstructCall(MacroAssembler* masm) {
   masm->int3();  // UNIMPLEMENTED.
 }
 
-void Builtins::Generate_JSConstructEntryTrampoline(MacroAssembler* masm) {
-  masm->int3();  // UNIMPLEMENTED.
+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 previous frame pointer to access C argument on stack
+  __ movq(kScratchRegister, Operand(rbp, 0));
+
+  // 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);
+  __ 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, kTimesPointerSize, 0));
+  __ push(Operand(kScratchRegister, 0));  // dereference handle
+  __ add(rcx, Immediate(1));
+  __ bind(&entry);
+  __ cmp(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);
+    __ 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) {
-  masm->int3();  // UNIMPLEMENTED.
+  Generate_JSEntryTrampolineHelper(masm, false);
+}
+
+
+void Builtins::Generate_JSConstructEntryTrampoline(MacroAssembler* masm) {
+  Generate_JSEntryTrampolineHelper(masm, true);
 }
 
 } }  // namespace v8::internal