Fast-compiler: Added trivial implementations of while and do/while.

src/fast-codegen.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 286 matching lines @@
   UNREACHABLE();
 }
 
 
 void FastCodeGenerator::VisitSwitchStatement(SwitchStatement* stmt) {
   UNREACHABLE();
 }
 
 
 void FastCodeGenerator::VisitDoWhileStatement(DoWhileStatement* stmt) {
-  UNREACHABLE();
+  Comment cmnt(masm_, "[ DoWhileStatement");
+  increment_loop_depth();
+  Label body, exit;
+
+  // Emit the test at the bottom of the loop.
+  __ bind(&body);
+  Visit(stmt->body());
+
+  // We are not in an expression context because we have been compiling
+  // statements.  Set up a test expression context for the condition.
+  ASSERT_EQ(NULL, true_label_);
+  ASSERT_EQ(NULL, false_label_);
+  true_label_ = &body;
+  false_label_ = &exit;
+  ASSERT(stmt->cond()->context() == Expression::kTest);
+  Visit(stmt->cond());
+
+  __ bind(&exit);
+
+  decrement_loop_depth();
 }
 
 
 void FastCodeGenerator::VisitWhileStatement(WhileStatement* stmt) {
-  UNREACHABLE();
+  Comment cmnt(masm_, "[ WhileStatement");
+  increment_loop_depth();
+  Label test, body, exit;
+
+  // Emit the test at the bottom of the loop.
+  __ jmp(&test);
+
+  __ bind(&body);
+  Visit(stmt->body());
+
+  __ bind(&test);
+  // We are not in an expression context because we have been compiling
+  // statements.  Set up a test expression context for the condition.
+  ASSERT_EQ(NULL, true_label_);
+  ASSERT_EQ(NULL, false_label_);
+  true_label_ = &body;
+  false_label_ = &exit;
+  ASSERT(stmt->cond()->context() == Expression::kTest);
+  Visit(stmt->cond());
+
+  __ bind(&exit);
+
+  decrement_loop_depth();
 }
 
 
 void FastCodeGenerator::VisitForStatement(ForStatement* stmt) {
   Comment cmnt(masm_, "[ ForStatement");
   Label test, body, exit;
   if (stmt->init() != NULL) Visit(stmt->init());
 
   increment_loop_depth();
   // Emit the test at the bottom of the loop (even if empty).
@@ skipping 154 matching lines @@
 
 void FastCodeGenerator::VisitThisFunction(ThisFunction* expr) {
   UNREACHABLE();
 }
 
 
 #undef __
 
 
 } }  // namespace v8::internal