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

src/ia32/fast-codegen-ia32.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 77 matching lines @@
     __ mov(esp, ebp);
     __ pop(ebp);
     __ ret((fun->scope()->num_parameters() + 1) * kPointerSize);
   }
 }
 
 
 void FastCodeGenerator::VisitExpressionStatement(ExpressionStatement* stmt) {
   Comment cmnt(masm_, "[ ExpressionStatement");
   Visit(stmt->expression());
-  __ pop(eax);
 }
 
 
 void FastCodeGenerator::VisitReturnStatement(ReturnStatement* stmt) {
   Comment cmnt(masm_, "[ ReturnStatement");
   Visit(stmt->expression());
   __ pop(eax);
   __ RecordJSReturn();
   // Do not use the leave instruction here because it is too short to
   // patch with the code required by the debugger.
   __ mov(esp, ebp);
   __ pop(ebp);
   __ ret((function_->scope()->num_parameters() + 1) * kPointerSize);
 }
 
 
 void FastCodeGenerator::VisitSlot(Slot* expr) {
   Comment cmnt(masm_, "[ Slot");
-  __ push(Operand(ebp, SlotOffset(expr)));
+  if (expr->location().is_temporary()) {
+    __ push(Operand(ebp, SlotOffset(expr)));
+  } else {
+    ASSERT(expr->location().is_nowhere());
+  }
 }
 
 
 void FastCodeGenerator::VisitLiteral(Literal* expr) {
   Comment cmnt(masm_, "[ Literal");
-  __ push(Immediate(expr->handle()));
+  if (expr->location().is_temporary()) {
+    __ push(Immediate(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);
-  __ mov(eax, Operand(esp, 0));
-  __ mov(Operand(ebp, SlotOffset(var->slot())), eax);
+
+  if (expr->location().is_temporary()) {
+    __ mov(eax, Operand(esp, 0));
+    __ mov(Operand(ebp, SlotOffset(var->slot())), eax);
+  } else {
+    ASSERT(expr->location().is_nowhere());
+    __ pop(Operand(ebp, SlotOffset(var->slot())));
+  }
 }
 
 
 } }  // namespace v8::internal