kc3-lang/angle/src/compiler/Common.h

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• Author : alokp@chromium.org
  Date : 2010-11-12 15:42:16
  Hash : 044a5cf8
  Message : Refactored glslang grammar files to make: - lexer and parser reentrant - line number handling automatic Caveats: - The preprocessor is still not thread-safe and full of bugs. I have another not-yet-ready patch to replace the preprocessor. - The grammar files use options that are not supported by the old versions of flex and bison checked into compiler/tools. So I need to check-in the generated lexer-parser along with a shell script to generate them. Review URL: http://codereview.appspot.com/2992041 git-svn-id: https://angleproject.googlecode.com/svn/trunk@475 736b8ea6-26fd-11df-bfd4-992fa37f6226

• src/compiler/Common.h

• //
  // Copyright (c) 2002-2010 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 _COMMON_INCLUDED_
  #define _COMMON_INCLUDED_
  
  #include <map>
  #include <sstream>
  #include <string>
  #include <vector>
  
  #include "compiler/PoolAlloc.h"
  
  // We need two pieces of information to report errors/warnings - string and
  // line number. We encode these into a single int so that it can be easily
  // incremented/decremented by lexer. The right SOURCE_LOC_LINE_SIZE bits store
  // line number while the rest store the string number. Since the shaders are
  // usually small, we should not run out of memory. SOURCE_LOC_LINE_SIZE
  // can be increased to alleviate this issue.
  typedef int TSourceLoc;
  const unsigned int SOURCE_LOC_LINE_SIZE = 16;  // in bits.
  const unsigned int SOURCE_LOC_LINE_MASK = (1 << SOURCE_LOC_LINE_SIZE) - 1;
  
  inline TSourceLoc EncodeSourceLoc(int string, int line) {
      return (string << SOURCE_LOC_LINE_SIZE) | (line & SOURCE_LOC_LINE_MASK);
  }
  
  inline void DecodeSourceLoc(TSourceLoc loc, int* string, int* line) {
      if (string) *string = loc >> SOURCE_LOC_LINE_SIZE;
      if (line) *line = loc & SOURCE_LOC_LINE_MASK;
  }
  
  //
  // Put POOL_ALLOCATOR_NEW_DELETE in base classes to make them use this scheme.
  //
  #define POOL_ALLOCATOR_NEW_DELETE(A)                                  \
      void* operator new(size_t s) { return (A).allocate(s); }          \
      void* operator new(size_t, void *_Where) { return (_Where);	}     \
      void operator delete(void*) { }                                   \
      void operator delete(void *, void *) { }                          \
      void* operator new[](size_t s) { return (A).allocate(s); }        \
      void* operator new[](size_t, void *_Where) { return (_Where);	} \
      void operator delete[](void*) { }                                 \
      void operator delete[](void *, void *) { }
  
  //
  // Pool version of string.
  //
  typedef pool_allocator<char> TStringAllocator;
  typedef std::basic_string <char, std::char_traits<char>, TStringAllocator> TString;
  typedef std::basic_ostringstream<char, std::char_traits<char>, TStringAllocator> TStringStream;
  inline TString* NewPoolTString(const char* s)
  {
  	void* memory = GlobalPoolAllocator.allocate(sizeof(TString));
  	return new(memory) TString(s);
  }
  
  //
  // Persistent string memory.  Should only be used for strings that survive
  // across compiles.
  //
  #define TPersistString std::string
  #define TPersistStringStream std::ostringstream
  
  //
  // Pool allocator versions of vectors, lists, and maps
  //
  template <class T> class TVector : public std::vector<T, pool_allocator<T> > {
  public:
      typedef typename std::vector<T, pool_allocator<T> >::size_type size_type;
      TVector() : std::vector<T, pool_allocator<T> >() {}
      TVector(const pool_allocator<T>& a) : std::vector<T, pool_allocator<T> >(a) {}
      TVector(size_type i): std::vector<T, pool_allocator<T> >(i) {}
  };
  
  template <class K, class D, class CMP = std::less<K> > 
  class TMap : public std::map<K, D, CMP, pool_allocator<std::pair<const K, D> > > {
  public:
      typedef pool_allocator<std::pair<const K, D> > tAllocator;
  
      TMap() : std::map<K, D, CMP, tAllocator>() {}
      // use correct two-stage name lookup supported in gcc 3.4 and above
      TMap(const tAllocator& a) : std::map<K, D, CMP, tAllocator>(std::map<K, D, CMP, tAllocator>::key_compare(), a) {}
  };
  
  #endif // _COMMON_INCLUDED_