kc3-lang/angle/src/compiler/translator/ImmutableStringBuilder.h

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  Commit

• Author : Jamie Madill
  Date : 2018-07-11 10:12:39
  Hash : 84c11c53
  Message : Vulkan: Implement sampler structs as function args. Bug: angleproject:2494 Change-Id: Ia8e374846427b7140ab2565ae5b9b18409a76d96 Reviewed-on: https://chromium-review.googlesource.com/1117323 Commit-Queue: Jamie Madill <jmadill@chromium.org> Reviewed-by: Olli Etuaho <oetuaho@nvidia.com>

• src/compiler/translator/ImmutableStringBuilder.h

• //
  // Copyright (c) 2018 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.
  //
  // ImmutableStringBuilder.h: Stringstream-like utility for building pool allocated strings where the
  // maximum length is known in advance.
  //
  
  #ifndef COMPILER_TRANSLATOR_IMMUTABLESTRINGBUILDER_H_
  #define COMPILER_TRANSLATOR_IMMUTABLESTRINGBUILDER_H_
  
  #include "compiler/translator/ImmutableString.h"
  
  namespace sh
  {
  
  class ImmutableStringBuilder
  {
    public:
      ImmutableStringBuilder(size_t maxLength)
          : mPos(0u), mMaxLength(maxLength), mData(AllocateEmptyPoolCharArray(maxLength))
      {
      }
  
      ImmutableStringBuilder &operator<<(const ImmutableString &str);
  
      ImmutableStringBuilder &operator<<(const char *str);
  
      ImmutableStringBuilder &operator<<(const char &c);
  
      // This invalidates the ImmutableStringBuilder, so it should only be called once.
      operator ImmutableString();
  
      void appendDecimal(const uint32_t &i);
  
      template <typename T>
      void appendHex(T number)
      {
          ASSERT(mData != nullptr);
          ASSERT(mPos + sizeof(T) * 2u <= mMaxLength);
          int index = static_cast<int>(sizeof(T)) * 2 - 1;
          // Loop through leading zeroes.
          while (((number >> (index * 4)) & 0xfu) == 0 && index > 0)
          {
              --index;
          }
          // Write the rest of the hex digits.
          while (index >= 0)
          {
              char digit     = static_cast<char>((number >> (index * 4)) & 0xfu);
              char digitChar = (digit < 10) ? (digit + '0') : (digit + ('a' - 10));
              mData[mPos++]  = digitChar;
              --index;
          }
      }
  
      template <typename T>
      static constexpr size_t GetHexCharCount()
      {
          return sizeof(T) * 2;
      }
  
    private:
      inline static char *AllocateEmptyPoolCharArray(size_t strLength)
      {
          size_t requiredSize = strLength + 1u;
          return static_cast<char *>(GetGlobalPoolAllocator()->allocate(requiredSize));
      }
  
      size_t mPos;
      size_t mMaxLength;
      char *mData;
  };
  
  // GLSL ES 3.00.6 section 3.9: the maximum length of an identifier is 1024 characters.
  constexpr unsigned int kESSLMaxIdentifierLength = 1024u;
  
  }  // namespace sh
  
  #endif  // COMPILER_TRANSLATOR_IMMUTABLESTRINGBUILDER_H_