MIPS: new style of property/function callbacks

Port r14725 (d393d88)

BUG=

Review URL: https://codereview.chromium.org/15562007
Patch from Balazs Kilvady <kilvadyb@homejinni.com>.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@14736 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/mips/macro-assembler-mips.cc

@@ -3929,7 +3929,9 @@ static int AddressOffset(ExternalReference ref0, ExternalReference ref1) {
 
 
 void MacroAssembler::CallApiFunctionAndReturn(ExternalReference function,
-                                              int stack_space) {
+                                              int stack_space,
+                                              bool returns_handle,
+                                              int return_value_offset_from_fp) {
   ExternalReference next_address =
       ExternalReference::handle_scope_next_address(isolate());
   const int kNextOffset = 0;
@@ -3985,15 +3987,20 @@ void MacroAssembler::CallApiFunctionAndReturn(ExternalReference function,
   Label promote_scheduled_exception;
   Label delete_allocated_handles;
   Label leave_exit_frame;
-
-  // If result is non-zero, dereference to get the result value
-  // otherwise set it to undefined.
-  Label skip;
-  LoadRoot(a0, Heap::kUndefinedValueRootIndex);
-  Branch(&skip, eq, v0, Operand(zero_reg));
-  lw(a0, MemOperand(v0));
-  bind(&skip);
-  mov(v0, a0);
+  Label return_value_loaded;
+
+  if (returns_handle) {
+    Label load_return_value;
+    Branch(&load_return_value, eq, v0, Operand(zero_reg));
+    // Dereference returned value.
+    lw(v0, MemOperand(v0));
+    b(&return_value_loaded);
+    nop();
+    bind(&load_return_value);
+  }
+  // Load value from ReturnValue.
+  lw(v0, MemOperand(fp, return_value_offset_from_fp*kPointerSize));
+  bind(&return_value_loaded);
 
   // No more valid handles (the result handle was the last one). Restore
   // previous handle scope.

src/mips/macro-assembler-mips.h

@@ -1237,7 +1237,10 @@ class MacroAssembler: public Assembler {
   // from handle and propagates exceptions.  Restores context.  stack_space
   // - space to be unwound on exit (includes the call JS arguments space and
   // the additional space allocated for the fast call).
-  void CallApiFunctionAndReturn(ExternalReference function, int stack_space);
+  void CallApiFunctionAndReturn(ExternalReference function,
+                                int stack_space,
+                                bool returns_handle,
+                                int return_value_offset_from_fp);
 
   // Jump to the builtin routine.
   void JumpToExternalReference(const ExternalReference& builtin,

src/mips/stub-cache-mips.cc

@@ -842,8 +842,7 @@ static void CompileCallLoadPropertyWithInterceptor(
 }
 
 
-static const int kFastApiCallArguments = 4;
-
+static const int kFastApiCallArguments = FunctionCallbackArguments::kArgsLength;
 
 // Reserves space for the extra arguments to API function in the
 // caller's frame.
@@ -872,10 +871,11 @@ static void GenerateFastApiDirectCall(MacroAssembler* masm,
   //  -- sp[4]              : callee JS function
   //  -- sp[8]              : call data
   //  -- sp[12]             : isolate
-  //  -- sp[16]             : last JS argument
+  //  -- sp[16]             : ReturnValue
+  //  -- sp[20]             : last JS argument
   //  -- ...
-  //  -- sp[(argc + 3) * 4] : first JS argument
-  //  -- sp[(argc + 4) * 4] : receiver
+  //  -- sp[(argc + 4) * 4] : first JS argument
+  //  -- sp[(argc + 5) * 4] : receiver
   // -----------------------------------
   // Get the function and setup the context.
   Handle<JSFunction> function = optimization.constant_function();
@@ -893,13 +893,15 @@ static void GenerateFastApiDirectCall(MacroAssembler* masm,
   }
 
   __ li(t3, Operand(ExternalReference::isolate_address(masm->isolate())));
-  // Store JS function, call data and isolate.
+  // Store JS function, call data, isolate and ReturnValue.
   __ sw(t1, MemOperand(sp, 1 * kPointerSize));
   __ sw(t2, MemOperand(sp, 2 * kPointerSize));
   __ sw(t3, MemOperand(sp, 3 * kPointerSize));
+  __ LoadRoot(t1, Heap::kUndefinedValueRootIndex);
+  __ sw(t1, MemOperand(sp, 4 * kPointerSize));
 
   // Prepare arguments.
-  __ Addu(a2, sp, Operand(3 * kPointerSize));
+  __ Addu(a2, sp, Operand(4 * kPointerSize));
 
   // Allocate the v8::Arguments structure in the arguments' space since
   // it's not controlled by GC.
@@ -930,13 +932,18 @@ static void GenerateFastApiDirectCall(MacroAssembler* masm,
 
   const int kStackUnwindSpace = argc + kFastApiCallArguments + 1;
   Address function_address = v8::ToCData<Address>(api_call_info->callback());
+  bool returns_handle =
+      !CallbackTable::ReturnsVoid(masm->isolate(), function_address);
   ApiFunction fun(function_address);
   ExternalReference ref =
       ExternalReference(&fun,
                         ExternalReference::DIRECT_API_CALL,
                         masm->isolate());
   AllowExternalCallThatCantCauseGC scope(masm);
-  __ CallApiFunctionAndReturn(ref, kStackUnwindSpace);
+  __ CallApiFunctionAndReturn(ref,
+                              kStackUnwindSpace,
+                              returns_handle,
+                              kFastApiCallArguments + 1);
 }
 
 class CallInterceptorCompiler BASE_EMBEDDED {
@@ -1410,12 +1417,14 @@ void BaseLoadStubCompiler::GenerateLoadCallback(
   } else {
     __ li(scratch3(), Handle<Object>(callback->data(), isolate()));
   }
-  __ Subu(sp, sp, 4 * kPointerSize);
-  __ sw(reg, MemOperand(sp, 3 * kPointerSize));
-  __ sw(scratch3(), MemOperand(sp, 2 * kPointerSize));
+  __ Subu(sp, sp, 5 * kPointerSize);
+  __ sw(reg, MemOperand(sp, 4 * kPointerSize));
+  __ sw(scratch3(), MemOperand(sp, 3 * kPointerSize));
   __ li(scratch3(),
         Operand(ExternalReference::isolate_address(isolate())));
-  __ sw(scratch3(), MemOperand(sp, 1 * kPointerSize));
+  __ LoadRoot(scratch4(), Heap::kUndefinedValueRootIndex);
+  __ sw(scratch3(), MemOperand(sp, 2 * kPointerSize));
+  __ sw(scratch4(), MemOperand(sp, 1 * kPointerSize));
   __ sw(name(), MemOperand(sp, 0 * kPointerSize));
 
   __ mov(a2, scratch2());  // Saved in case scratch2 == a1.
@@ -1436,12 +1445,17 @@ void BaseLoadStubCompiler::GenerateLoadCallback(
   // a2 (second argument - see note above) = AccessorInfo&
   __ Addu(a2, sp, kPointerSize);
 
-  const int kStackUnwindSpace = 5;
+  const int kStackUnwindSpace = kFastApiCallArguments + 1;
   Address getter_address = v8::ToCData<Address>(callback->getter());
+  bool returns_handle =
+      !CallbackTable::ReturnsVoid(isolate(), getter_address);
   ApiFunction fun(getter_address);
   ExternalReference ref = ExternalReference(
       &fun, ExternalReference::DIRECT_GETTER_CALL, isolate());
-  __ CallApiFunctionAndReturn(ref, kStackUnwindSpace);
+  __ CallApiFunctionAndReturn(ref,
+                              kStackUnwindSpace,
+                              returns_handle,
+                              3);
 }