Added first support for tracking locations of expressions in the...

src/x64/fast-codegen-x64.cc

 // Copyright 2009 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 85 matching lines @@
       masm_->int3();
     }
 #endif
   }
 }
 
 
 void FastCodeGenerator::VisitExpressionStatement(ExpressionStatement* stmt) {
   Comment cmnt(masm_, "[ ExpressionStatement");
   Visit(stmt->expression());
-  __ pop(rax);
 }
 
 
 void FastCodeGenerator::VisitReturnStatement(ReturnStatement* stmt) {
   Comment cmnt(masm_, "[ ReturnStatement");
   Visit(stmt->expression());
   __ pop(rax);
   __ RecordJSReturn();
   // Do not use the leave instruction here because it is too short to
   // patch with the code required by the debugger.
   __ movq(rsp, rbp);
   __ pop(rbp);
   __ ret((function_->scope()->num_parameters() + 1) * kPointerSize);
 #ifdef ENABLE_DEBUGGER_SUPPORT
   // Add padding that will be overwritten by a debugger breakpoint.  We
   // have just generated "movq rsp, rbp; pop rbp; ret k" with length 7
   // (3 + 1 + 3).
   const int kPadding = Debug::kX64JSReturnSequenceLength - 7;
   for (int i = 0; i < kPadding; ++i) {
     masm_->int3();
   }
 #endif
 }
 
 
 void FastCodeGenerator::VisitSlot(Slot* expr) {
   Comment cmnt(masm_, "[ Slot");
-  __ push(Operand(rbp, SlotOffset(expr)));
+  if (expr->location().is_temporary()) {
+    __ push(Operand(rbp, SlotOffset(expr)));
+  } else {
+    ASSERT(expr->location().is_nowhere());
+  }
 }
 
 
 void FastCodeGenerator::VisitLiteral(Literal* expr) {
   Comment cmnt(masm_, "[ Literal");
-  __ Push(expr->handle());
+  if (expr->location().is_temporary()) {
+    __ Push(expr->handle());
+  } else {
+    ASSERT(expr->location().is_nowhere());
+  }
 }
 
 
 void FastCodeGenerator::VisitAssignment(Assignment* expr) {
   Comment cmnt(masm_, "[ Assignment");
   ASSERT(expr->op() == Token::ASSIGN || expr->op() == Token::INIT_VAR);
 
   Visit(expr->value());
 
   Variable* var = expr->target()->AsVariableProxy()->AsVariable();
   ASSERT(var != NULL && var->slot() != NULL);
-  __ movq(rax, Operand(rsp, 0));
-  __ movq(Operand(rbp, SlotOffset(var->slot())), rax);
+
+  if (expr->location().is_temporary()) {
+    __ movq(rax, Operand(rsp, 0));
+    __ movq(Operand(rbp, SlotOffset(var->slot())), rax);
+  } else {
+    ASSERT(expr->location().is_nowhere());
+    __ pop(Operand(rbp, SlotOffset(var->slot())));
+  }
 }
 
 
 } }  // namespace v8::internal