v8::internal::HStackCheckEliminationPhase Class Reference

#include <hydrogen-sce.h>

Inheritance diagram for v8::internal::HStackCheckEliminationPhase:

Collaboration diagram for v8::internal::HStackCheckEliminationPhase:

Public Member Functions
	HStackCheckEliminationPhase (HGraph *graph)
void	Run ()
Public Member Functions inherited from v8::internal::HPhase
	HPhase (const char *name, HGraph *graph)
	~HPhase ()

Additional Inherited Members
Protected Member Functions inherited from v8::internal::HPhase
HGraph *	graph () const

Detailed Description

Definition at line 14 of file hydrogen-sce.h.

Constructor & Destructor Documentation

HStackCheckEliminationPhase()

v8::internal::HStackCheckEliminationPhase::HStackCheckEliminationPhase ( HGraph *  graph )

inlineexplicit

Definition at line 16 of file hydrogen-sce.h.

      : HPhase("H_Stack check elimination", graph) { }

Member Function Documentation

Run()

void v8::internal::HStackCheckEliminationPhase::Run

(

)

Definition at line 11 of file hydrogen-sce.cc.

                                      {
  // For each loop block walk the dominator tree from the backwards branch to
  // the loop header. If a call instruction is encountered the backwards branch
  // is dominated by a call and the stack check in the backwards branch can be
  // removed.
  for (int i = 0; i < graph()->blocks()->length(); i++) {
    HBasicBlock* block = graph()->blocks()->at(i);
    if (block->IsLoopHeader()) {
      HBasicBlock* back_edge = block->loop_information()->GetLastBackEdge();
      HBasicBlock* dominator = back_edge;
      while (true) {
        for (HInstructionIterator it(dominator); !it.Done(); it.Advance()) {
          if (it.Current()->HasStackCheck()) {
            block->loop_information()->stack_check()->Eliminate();
            break;
          }
        }
 
        // Done when the loop header is processed.
        if (dominator == block) break;
 
        // Move up the dominator tree.
        dominator = dominator->dominator();
      }
    }
  }
}

References v8::internal::HPhase::graph().

Here is the call graph for this function:

---

The documentation for this class was generated from the following files:

• /mnt/V8SourceCode/src/hydrogen-sce.h
• /mnt/V8SourceCode/src/hydrogen-sce.cc