kc3-lang/angle/src/compiler/depgraph/DependencyGraphOutput.h

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• Hash : 66ebd014
  Author :
  Date : 2012-05-30T22:18:11
  

  Add the SH_TIMING_RESTRICTIONS compile flag and dependency graph implementation.
  
  Description of the algorithm:
  http://code.google.com/p/mvujovic/wiki/ShaderControlFlowAnalysis
  
  This flag is one potential solution to timing attacks on textures containing cross-domain content
  or user agent data.
  This kind of analysis could be useful for both WebGL and CSS Shaders.
  
  The SH_TIMING_RESTRICTIONS flag will reject a shader if it uses texture dependent data to affect
  control flow.
  
  Other ways of affecting shader timing such as using NaNs in basic arithmetic operations or using
  built-in functions (e.g. atan) with different inputs are still under investigation.
  
  Issue=329
  Review URL: http://codereview.appspot.com/6195062/
  
  
  
  git-svn-id: https://angleproject.googlecode.com/svn/trunk@1101 736b8ea6-26fd-11df-bfd4-992fa37f6226
  

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• src/compiler/depgraph/DependencyGraphOutput.h

• //
  // Copyright (c) 2012 The ANGLE Project Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style license that can be
  // found in the LICENSE file.
  //
  
  #ifndef COMPILER_DEPGRAPH_DEPENDENCY_GRAPH_OUTPUT_H
  #define COMPILER_DEPGRAPH_DEPENDENCY_GRAPH_OUTPUT_H
  
  #include "compiler/depgraph/DependencyGraph.h"
  #include "compiler/InfoSink.h"
  
  class TDependencyGraphOutput : public TDependencyGraphTraverser {
  public:
      TDependencyGraphOutput(TInfoSinkBase& sink) : mSink(sink) {}
      virtual void visitSymbol(TGraphSymbol* symbol);
      virtual void visitArgument(TGraphArgument* parameter);
      virtual void visitFunctionCall(TGraphFunctionCall* functionCall);
      virtual void visitSelection(TGraphSelection* selection);
      virtual void visitLoop(TGraphLoop* loop);
      virtual void visitLogicalOp(TGraphLogicalOp* logicalOp);
  
      void outputAllSpanningTrees(TDependencyGraph& graph);
  private:
      void outputIndentation();
  
      TInfoSinkBase& mSink;
  };
  
  #endif  // COMPILER_DEPGRAPH_DEPENDENCY_GRAPH_OUTPUT_H
  

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