Remove stack height tracking from ia32 non-optimizing code generator. Reverts change 8755.

src/full-codegen.h

Index: src/full-codegen.h
===================================================================
--- src/full-codegen.h	(revision 9827)
+++ src/full-codegen.h	(working copy)
@@ -83,7 +83,6 @@
         scope_(NULL),
         nesting_stack_(NULL),
         loop_depth_(0),
-        stack_height_(0),
         context_(NULL),
         bailout_entries_(0),
         stack_checks_(2),  // There's always at least one.
@@ -539,35 +538,6 @@
     loop_depth_--;
   }
 
-#if defined(V8_TARGET_ARCH_IA32)
-  int stack_height() { return stack_height_; }
-  void set_stack_height(int depth) { stack_height_ = depth; }
-  void increment_stack_height() { stack_height_++; }
-  void increment_stack_height(int delta) { stack_height_ += delta; }
-  void decrement_stack_height() {
-    if (FLAG_verify_stack_height) {
-      ASSERT(stack_height_ > 0);
-    }
-    stack_height_--;
-  }
-  void decrement_stack_height(int delta) {
-    stack_height_-= delta;
-    if (FLAG_verify_stack_height) {
-      ASSERT(stack_height_ >= 0);
-    }
-  }
-  // Call this function only if FLAG_verify_stack_height is true.
-  void verify_stack_height();  // Generates a runtime check of esp - ebp.
-#else
-  int stack_height() { return 0; }
-  void set_stack_height(int depth) {}
-  void increment_stack_height() {}
-  void increment_stack_height(int delta) {}
-  void decrement_stack_height() {}
-  void decrement_stack_height(int delta) {}
-  void verify_stack_height() {}
-#endif  // V8_TARGET_ARCH_IA32
-
   MacroAssembler* masm() { return masm_; }
 
   class ExpressionContext;
@@ -630,10 +600,6 @@
 
     virtual ~ExpressionContext() {
       codegen_->set_new_context(old_);
-      if (FLAG_verify_stack_height) {
-        ASSERT_EQ(expected_stack_height_, codegen()->stack_height());
-        codegen()->verify_stack_height();
-      }
     }
 
     Isolate* isolate() const { return codegen_->isolate(); }
@@ -687,7 +653,6 @@
     FullCodeGenerator* codegen() const { return codegen_; }
     MacroAssembler* masm() const { return masm_; }
     MacroAssembler* masm_;
-    int expected_stack_height_;  // The expected stack height esp - ebp on exit.
 
    private:
     const ExpressionContext* old_;
@@ -697,9 +662,7 @@
   class AccumulatorValueContext : public ExpressionContext {
    public:
     explicit AccumulatorValueContext(FullCodeGenerator* codegen)
-        : ExpressionContext(codegen) {
-      expected_stack_height_ = codegen->stack_height();
-    }
+        : ExpressionContext(codegen) { }
 
     virtual void Plug(bool flag) const;
     virtual void Plug(Register reg) const;
@@ -720,9 +683,7 @@
   class StackValueContext : public ExpressionContext {
    public:
     explicit StackValueContext(FullCodeGenerator* codegen)
-        : ExpressionContext(codegen) {
-      expected_stack_height_ = codegen->stack_height() + 1;
-    }
+        : ExpressionContext(codegen) { }
 
     virtual void Plug(bool flag) const;
     virtual void Plug(Register reg) const;
@@ -751,9 +712,7 @@
           condition_(condition),
           true_label_(true_label),
           false_label_(false_label),
-          fall_through_(fall_through) {
-      expected_stack_height_ = codegen->stack_height();
-    }
+          fall_through_(fall_through) { }
 
     static const TestContext* cast(const ExpressionContext* context) {
       ASSERT(context->IsTest());
@@ -790,11 +749,8 @@
   class EffectContext : public ExpressionContext {
    public:
     explicit EffectContext(FullCodeGenerator* codegen)
-        : ExpressionContext(codegen) {
-      expected_stack_height_ = codegen->stack_height();
-    }
+        : ExpressionContext(codegen) { }
 
-
     virtual void Plug(bool flag) const;
     virtual void Plug(Register reg) const;
     virtual void Plug(Label* materialize_true, Label* materialize_false) const;
@@ -817,7 +773,6 @@
   Label return_label_;
   NestedStatement* nesting_stack_;
   int loop_depth_;
-  int stack_height_;
   const ExpressionContext* context_;
   ZoneList<BailoutEntry> bailout_entries_;
   ZoneList<BailoutEntry> stack_checks_;