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

src/x64/builtins-x64.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_X64
 
 #include "src/code-factory.h"
 #include "src/codegen.h"
@@ skipping 678 matching lines @@
   // MANUAL indicates that the scope shouldn't actually generate code to set up
   // the frame (that is done below).
   FrameScope frame_scope(masm, StackFrame::MANUAL);
   __ pushq(rbp);  // Caller's frame pointer.
   __ movp(rbp, rsp);
   __ Push(rsi);  // Callee's context.
   __ Push(rdi);  // Callee's JS function.
 
   // Get the bytecode array from the function object and load the pointer to the
   // first entry into edi (InterpreterBytecodeRegister).
-  __ movp(r14, FieldOperand(rdi, JSFunction::kSharedFunctionInfoOffset));
-  __ movp(r14, FieldOperand(r14, SharedFunctionInfo::kFunctionDataOffset));
+  __ movp(rax, FieldOperand(rdi, JSFunction::kSharedFunctionInfoOffset));
+  __ movp(kInterpreterBytecodeArrayRegister,
+          FieldOperand(rax, SharedFunctionInfo::kFunctionDataOffset));
 
   if (FLAG_debug_code) {
     // Check function data field is actually a BytecodeArray object.
-    __ AssertNotSmi(r14);
-    __ CmpObjectType(r14, BYTECODE_ARRAY_TYPE, rax);
+    __ AssertNotSmi(kInterpreterBytecodeArrayRegister);
+    __ CmpObjectType(kInterpreterBytecodeArrayRegister, BYTECODE_ARRAY_TYPE,
+                     rax);
     __ Assert(equal, kFunctionDataShouldBeBytecodeArrayOnInterpreterEntry);
   }
 
   // Allocate the local and temporary register file on the stack.
   {
     // Load frame size from the BytecodeArray object.
-    __ movl(rcx, FieldOperand(r14, BytecodeArray::kFrameSizeOffset));
+    __ movl(rcx, FieldOperand(kInterpreterBytecodeArrayRegister,
+                              BytecodeArray::kFrameSizeOffset));
 
     // Do a stack check to ensure we don't go over the limit.
     Label ok;
     __ movp(rdx, rsp);
     __ subp(rdx, rcx);
     __ CompareRoot(rdx, Heap::kRealStackLimitRootIndex);
     __ j(above_equal, &ok, Label::kNear);
     __ 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(rdx, Heap::kUndefinedValueRootIndex);
+    __ j(always, &loop_check);
     __ bind(&loop_header);
     // TODO(rmcilroy): Consider doing more than one push per loop iteration.
     __ Push(rdx);
     // Continue loop if not done.
+    __ bind(&loop_check);
     __ subp(rcx, Immediate(kPointerSize));
-    __ j(not_equal, &loop_header, Label::kNear);
+    __ j(greater_equal, &loop_header, Label::kNear);
   }
 
   // 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
   //    receiver with the global proxy when called as functions (without an
   //    explicit receiver object).
@@ skipping 12 matching lines @@
 
   // Perform stack guard check.
   {
     Label ok;
     __ CompareRoot(rsp, Heap::kStackLimitRootIndex);
     __ j(above_equal, &ok, Label::kNear);
     __ CallRuntime(Runtime::kStackGuard, 0);
     __ bind(&ok);
   }
 
-  // Load bytecode offset and dispatch table into registers.
-  __ movp(r12, Immediate(BytecodeArray::kHeaderSize - kHeapObjectTag));
-  __ LoadRoot(r15, Heap::kInterpreterTableRootIndex);
-  __ addp(r15, Immediate(FixedArray::kHeaderSize - kHeapObjectTag));
+  // Load accumulator, register file, bytecode offset, dispatch table into
+  // registers.
+  __ LoadRoot(kInterpreterAccumulatorRegister, Heap::kUndefinedValueRootIndex);
+  __ movp(kInterpreterRegisterFileRegister, rbp);
+  __ subp(
+      kInterpreterRegisterFileRegister,
+      Immediate(kPointerSize + StandardFrameConstants::kFixedFrameSizeFromFp));
+  __ movp(kInterpreterBytecodeOffsetRegister,
+          Immediate(BytecodeArray::kHeaderSize - kHeapObjectTag));
+  __ LoadRoot(kInterpreterDispatchTableRegister,
+              Heap::kInterpreterTableRootIndex);
+  __ addp(kInterpreterDispatchTableRegister,
+          Immediate(FixedArray::kHeaderSize - kHeapObjectTag));
 
   // Dispatch to the first bytecode handler for the function.
-  __ movzxbp(rax, Operand(r14, r12, times_1, 0));
-  __ movp(rax, Operand(r15, rax, times_pointer_size, 0));
+  __ movzxbp(rbx, Operand(kInterpreterBytecodeArrayRegister,
+                          kInterpreterBytecodeOffsetRegister, times_1, 0));
+  __ movp(rbx, Operand(kInterpreterDispatchTableRegister, rbx,
+                       times_pointer_size, 0));
   // TODO(rmcilroy): Make dispatch table point to code entrys to avoid untagging
   // and header removal.
-  __ addp(rax, Immediate(Code::kHeaderSize - kHeapObjectTag));
-  __ jmp(rax);
+  __ addp(rbx, Immediate(Code::kHeaderSize - kHeapObjectTag));
+  __ call(rbx);
 }
 
 
 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 r0.
-  __ movp(rax, Operand(rbp, -kPointerSize -
-                                StandardFrameConstants::kFixedFrameSizeFromFp));
+  // The return value is in accumulator, which is already in rax.
+
   // Leave the frame (also dropping the register file).
   __ leave();
   // Return droping receiver + arguments.
   // TODO(rmcilroy): Get number of arguments from BytecodeArray.
   __ Ret(1 * kPointerSize, rcx);
 }
 
 
 void Builtins::Generate_CompileLazy(MacroAssembler* masm) {
   CallRuntimePassFunction(masm, Runtime::kCompileLazy);
@@ skipping 1037 matching lines @@
   __ ret(0);
 }
 
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_X64