[interpreter]: Changes to interpreter builtins for accumulator and register file registers.

src/mips/builtins-mips.cc

 // Copyright 2012 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_MIPS
 
@@ skipping 899 matching lines @@
 
     // Do a stack check to ensure we don't go over the limit.
     Label ok;
     __ Subu(t1, sp, Operand(t0));
     __ LoadRoot(a2, Heap::kRealStackLimitRootIndex);
     __ Branch(&ok, hs, t1, Operand(a2));
     __ InvokeBuiltin(Builtins::STACK_OVERFLOW, CALL_FUNCTION);
     __ bind(&ok);
 
     // If ok, push undefined as the initial value for all register file entries.
-    // Note: there should always be at least one stack slot for the return
-    // register in the register file.
     Label loop_header;
+    Label loop_check;
     __ LoadRoot(t1, Heap::kUndefinedValueRootIndex);
+    __ Branch(&loop_check);
     __ bind(&loop_header);
     // TODO(rmcilroy): Consider doing more than one push per loop iteration.
     __ push(t1);
     // Continue loop if not done.
+    __ bind(&loop_check);
     __ Subu(t0, t0, Operand(kPointerSize));
     __ Branch(&loop_header, ge, t0, Operand(zero_reg));
   }
 
   // TODO(rmcilroy): List of things not currently dealt with here but done in
   // fullcodegen's prologue:
   //  - Support profiler (specifically profiling_counter).
   //  - Call ProfileEntryHookStub when isolate has a function_entry_hook.
   //  - Allow simulator stop operations if FLAG_stop_at is set.
   //  - Deal with sloppy mode functions which need to replace the
@@ skipping 15 matching lines @@
   // Perform stack guard check.
   {
     Label ok;
     __ LoadRoot(at, Heap::kStackLimitRootIndex);
     __ Branch(&ok, hs, sp, Operand(at));
     __ CallRuntime(Runtime::kStackGuard, 0);
     __ bind(&ok);
   }
 
   // Load bytecode offset and dispatch table into registers.
+  __ LoadRoot(kInterpreterAccumulatorRegister, Heap::kUndefinedValueRootIndex);
+  __ Subu(
+      kInterpreterRegisterFileRegister, fp,
+      Operand(kPointerSize + StandardFrameConstants::kFixedFrameSizeFromFp));
   __ li(kInterpreterBytecodeOffsetRegister,
         Operand(BytecodeArray::kHeaderSize - kHeapObjectTag));
   __ LoadRoot(kInterpreterDispatchTableRegister,
               Heap::kInterpreterTableRootIndex);
   __ Addu(kInterpreterDispatchTableRegister, kInterpreterDispatchTableRegister,
           Operand(FixedArray::kHeaderSize - kHeapObjectTag));
 
   // Dispatch to the first bytecode handler for the function.
   __ Addu(a0, kInterpreterBytecodeArrayRegister,
           kInterpreterBytecodeOffsetRegister);
   __ lbu(a0, MemOperand(a0));
   __ sll(at, a0, kPointerSizeLog2);
   __ Addu(at, kInterpreterDispatchTableRegister, at);
   __ lw(at, MemOperand(at));
   // TODO(rmcilroy): Make dispatch table point to code entrys to avoid untagging
   // and header removal.
   __ Addu(at, at, Operand(Code::kHeaderSize - kHeapObjectTag));
-  __ Jump(at);
+  __ Call(at);
 }
 
 
 void Builtins::Generate_InterpreterExitTrampoline(MacroAssembler* masm) {
   // TODO(rmcilroy): List of things not currently dealt with here but done in
   // fullcodegen's EmitReturnSequence.
   //  - Supporting FLAG_trace for Runtime::TraceExit.
   //  - Support profiler (specifically decrementing profiling_counter
   //    appropriately and calling out to HandleInterrupts if necessary).
 
-  // Load return value into v0.
-  __ lw(v0, MemOperand(fp, -kPointerSize -
-                               StandardFrameConstants::kFixedFrameSizeFromFp));
+  // The return value is in accumulator, which is already in v0.
+
   // Leave the frame (also dropping the register file).
   __ LeaveFrame(StackFrame::JAVA_SCRIPT);
   // Drop receiver + arguments.
   __ Drop(1);  // TODO(rmcilroy): Get number of arguments from BytecodeArray.
   __ Jump(ra);
 }
 
 
 void Builtins::Generate_CompileLazy(MacroAssembler* masm) {
   CallRuntimePassFunction(masm, Runtime::kCompileLazy);
@@ skipping 869 matching lines @@
   }
 }
 
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_MIPS