- Make VirtualFrame and JumpTarget zone allocated.

- Compacted the VirtualFrame representation.
-> Improved the compiler speed with 10%

Review URL: http://codereview.chromium.org/115345

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@1947 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/arm/virtual-frame-arm.cc

@@ -102,7 +102,7 @@ void VirtualFrame::MergeTo(VirtualFrame* expected) {
   // Fix any sync bit problems from the bottom-up, stopping when we
   // hit the stack pointer or the top of the frame if the stack
   // pointer is floating above the frame.
-  int limit = Min(stack_pointer_, elements_.length() - 1);
+  int limit = Min(static_cast<int>(stack_pointer_), elements_.length() - 1);
   for (int i = 0; i <= limit; i++) {
     FrameElement source = elements_[i];
     FrameElement target = expected->elements_[i];
@@ -134,7 +134,7 @@ void VirtualFrame::MergeMoveRegistersToMemory(VirtualFrame* expected) {
   // On ARM, all elements are in memory.
 
 #ifdef DEBUG
-  int start = Min(stack_pointer_, elements_.length() - 1);
+  int start = Min(static_cast<int>(stack_pointer_), elements_.length() - 1);
   for (int i = start; i >= 0; i--) {
     ASSERT(elements_[i].is_memory());
     ASSERT(expected->elements_[i].is_memory());

src/arm/virtual-frame-arm.h

@@ -41,7 +41,7 @@ namespace v8 { namespace internal {
 // as random access to the expression stack elements, locals, and
 // parameters.
 
-class VirtualFrame : public Malloced {
+class VirtualFrame : public ZoneObject {
  public:
   // A utility class to introduce a scope where the virtual frame is
   // expected to remain spilled.  The constructor spills the code
@@ -335,23 +335,23 @@ class VirtualFrame : public Malloced {
   CodeGenerator* cgen_;
   MacroAssembler* masm_;
 
-  List<FrameElement> elements_;
+  ZoneList<FrameElement> elements_;
 
   // The number of frame-allocated locals and parameters respectively.
-  int parameter_count_;
-  int local_count_;
+  int16_t parameter_count_;
+  int16_t local_count_;
 
   // The index of the element that is at the processor's stack pointer
   // (the sp register).
-  int stack_pointer_;
+  int16_t stack_pointer_;
 
   // The index of the element that is at the processor's frame pointer
   // (the fp register).
-  int frame_pointer_;
+  int16_t frame_pointer_;
 
   // The index of the register frame element using each register, or
   // kIllegalIndex if a register is not on the frame.
-  int register_locations_[kNumRegisters];
+  int16_t register_locations_[kNumRegisters];
 
   // The index of the first parameter.  The receiver lies below the first
   // parameter.

src/ia32/virtual-frame-ia32.cc

@@ -244,7 +244,7 @@ void VirtualFrame::MergeMoveRegistersToMemory(VirtualFrame* expected) {
   FrameElement memory_element = FrameElement::MemoryElement();
   // Loop downward from the stack pointer or the top of the frame if
   // the stack pointer is floating above the frame.
-  int start = Min(stack_pointer_, elements_.length() - 1);
+  int start = Min(static_cast<int>(stack_pointer_), elements_.length() - 1);
   for (int i = start; i >= 0; i--) {
     FrameElement target = expected->elements_[i];
     if (target.is_memory()) {

src/ia32/virtual-frame-ia32.h

@@ -41,7 +41,7 @@ namespace v8 { namespace internal {
 // as random access to the expression stack elements, locals, and
 // parameters.
 
-class VirtualFrame : public Malloced {
+class VirtualFrame : public ZoneObject {
  public:
   // A utility class to introduce a scope where the virtual frame is
   // expected to remain spilled.  The constructor spills the code
@@ -349,23 +349,23 @@ class VirtualFrame : public Malloced {
   CodeGenerator* cgen_;
   MacroAssembler* masm_;
 
-  List<FrameElement> elements_;
+  ZoneList<FrameElement> elements_;
 
   // The number of frame-allocated locals and parameters respectively.
-  int parameter_count_;
-  int local_count_;
+  int16_t parameter_count_;
+  int16_t local_count_;
 
   // The index of the element that is at the processor's stack pointer
   // (the esp register).
-  int stack_pointer_;
+  int16_t stack_pointer_;
 
   // The index of the element that is at the processor's frame pointer
   // (the ebp register).
-  int frame_pointer_;
+  int16_t frame_pointer_;
 
   // The index of the register frame element using each register, or
   // kIllegalIndex if a register is not on the frame.
-  int register_locations_[kNumRegisters];
+  int16_t register_locations_[kNumRegisters];
 
   // The index of the first parameter.  The receiver lies below the first
   // parameter.

src/jump-target.cc

@@ -41,11 +41,11 @@ bool JumpTarget::compiling_deferred_code_ = false;
 JumpTarget::JumpTarget(CodeGenerator* cgen, Directionality direction)
     : cgen_(cgen),
       direction_(direction),
+      is_bound_(false),
+      is_linked_(false),
       reaching_frames_(0),
       merge_labels_(0),
-      entry_frame_(NULL),
-      is_bound_(false),
-      is_linked_(false) {
+      entry_frame_(NULL) {
   ASSERT(cgen != NULL);
   masm_ = cgen->masm();
 }
@@ -55,11 +55,11 @@ JumpTarget::JumpTarget()
     : cgen_(NULL),
       masm_(NULL),
       direction_(FORWARD_ONLY),
+      is_bound_(false),
+      is_linked_(false),
       reaching_frames_(0),
       merge_labels_(0),
-      entry_frame_(NULL),
-      is_bound_(false),
-      is_linked_(false) {
+      entry_frame_(NULL) {
 }
 
 
@@ -73,19 +73,6 @@ void JumpTarget::Initialize(CodeGenerator* cgen, Directionality direction) {
 
 
 void JumpTarget::Unuse() {
-  // We should not deallocate jump targets that have unresolved jumps
-  // to them.  In the event of a compile-time stack overflow or an
-  // uninitialized jump target, we don't care.
-  ASSERT(!is_linked() || cgen_ == NULL || cgen_->HasStackOverflow());
-  for (int i = 0; i < reaching_frames_.length(); i++) {
-    delete reaching_frames_[i];
-  }
-  delete entry_frame_;
-  Reset();
-}
-
-
-void JumpTarget::Reset() {
   reaching_frames_.Clear();
   merge_labels_.Clear();
   entry_frame_ = NULL;
@@ -662,10 +649,8 @@ ShadowTarget::ShadowTarget(BreakTarget* shadowed) {
   // While shadowing this shadow target saves the state of the original.
   shadowed->CopyTo(this);
 
-  // The original's state is reset.  We do not Unuse it because that
-  // would delete the expected frame and assert that the target is not
-  // linked.
-  shadowed->Reset();
+  // The original's state is reset.
+  shadowed->Unuse();
   ASSERT(cgen_ != NULL);
   ASSERT(cgen_->has_valid_frame());
   shadowed->set_expected_height(cgen_->frame()->height());
@@ -691,7 +676,7 @@ void ShadowTarget::StopShadowing() {
   other_target_->CopyTo(&temp);
   CopyTo(other_target_);
   temp.CopyTo(this);
-  temp.Reset();  // So the destructor does not deallocate virtual frames.
+  temp.Unuse();
 
 #ifdef DEBUG
   is_shadowing_ = false;

src/jump-target.h

@@ -52,7 +52,7 @@ class VirtualFrame;
 // In particular, this means that at least one of the control-flow
 // graph edges reaching the target must be a forward edge.
 
-class JumpTarget : public Malloced {  // Shadows are dynamically allocated.
+class JumpTarget : public ZoneObject {  // Shadows are dynamically allocated.
  public:
   // Forward-only jump targets can only be reached by forward CFG edges.
   enum Directionality { FORWARD_ONLY, BIDIRECTIONAL };
@@ -75,18 +75,9 @@ class JumpTarget : public Malloced {  // Shadows are dynamically allocated.
   virtual void Initialize(CodeGenerator* cgen,
                           Directionality direction = FORWARD_ONLY);
 
-  virtual ~JumpTarget() { Unuse(); }
-
-  // Treat the jump target as a fresh one.  The state is reset and
-  // pointed-to virtual frames are deallocated.  There should be no
-  // dangling jumps to the target.
+  // Treat the jump target as a fresh one.  The state is reset.
   void Unuse();
 
-  // Reset the internal state of this jump target.  Pointed-to virtual
-  // frames are not deallocated and dangling jumps to the target are
-  // left dangling.
-  void Reset();
-
   // Accessors.
   CodeGenerator* code_generator() const { return cgen_; }
 
@@ -175,11 +166,17 @@ class JumpTarget : public Malloced {  // Shadows are dynamically allocated.
   // Directionality flag set at initialization time.
   Directionality direction_;
 
+  // A target is bound if its Bind member function has been called.
+  // It is linked if it is not bound but its Jump, Branch, or Call
+  // member functions have been called.
+  bool is_bound_;
+  bool is_linked_;
+
   // A list of frames reaching this block via forward jumps.
-  List<VirtualFrame*> reaching_frames_;
+  ZoneList<VirtualFrame*> reaching_frames_;
 
   // A parallel list of labels for merge code.
-  List<Label> merge_labels_;
+  ZoneList<Label> merge_labels_;
 
   // The frame used on entry to the block and expected at backward
   // jumps to the block.  Set when the jump target is bound, but may
@@ -189,12 +186,6 @@ class JumpTarget : public Malloced {  // Shadows are dynamically allocated.
   // The actual entry label of the block.
   Label entry_label_;
 
-  // A target is bound if its Bind member function has been called.
-  // It is linked if it is not bound but its Jump, Branch, or Call
-  // member functions have been called.
-  bool is_bound_;
-  bool is_linked_;
-
   // Implementations of Jump, Branch, and Bind with all arguments and
   // return values using the virtual frame.
   void DoJump();
@@ -296,10 +287,6 @@ class ShadowTarget : public BreakTarget {
   // flow intended for the shadowed one.
   explicit ShadowTarget(BreakTarget* shadowed);
 
-  virtual ~ShadowTarget() {
-    ASSERT(!is_shadowing_);
-  }
-
   // End shadowing.  After shadowing ends, the original jump target
   // again gives access to the formerly shadowed target and the shadow
   // target object gives access to the formerly shadowing target.