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

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• Hash : a02670d6
  Author :
  Date : 2025-08-26T20:41:16
  

  Move unsafe buffers inside header guard macros
  
  While this is exactly opposite of what Chromium has chosen to do,
  there is an issue with clang-format trying to indent preprocessor
  directives four spaces relative to include guard. This is because
  Angle's .clang-format file specifies IndentPPDirectives: AfterHash
  but Chromium's does not. The current placement is sufficient to
  throw off clang-format's guard detection since the guard macro no
  longer covers the entire file.
  
  Bug: b/436880895
  Change-Id: Ic6b99c8cef6213939cdf9b42af8730e1eb423065
  Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/6885892
  Reviewed-by: Geoff Lang <geofflang@chromium.org>
  Commit-Queue: Geoff Lang <geofflang@chromium.org>
  Auto-Submit: Tom Sepez <tsepez@chromium.org>
  Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>
  

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• src/compiler/translator/ImmutableStringBuilder.h

• //
  // Copyright 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_
  
  #ifdef UNSAFE_BUFFERS_BUILD
  #    pragma allow_unsafe_buffers
  #endif
  
  #include <cstring>
  
  #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) { return *this << ImmutableString(str); }
      ImmutableStringBuilder &operator<<(char c);
      ImmutableStringBuilder &operator<<(int i) { return *this << static_cast<int64_t>(i); }
      ImmutableStringBuilder &operator<<(unsigned i) { return *this << static_cast<uint64_t>(i); }
      ImmutableStringBuilder &operator<<(int64_t i);
      ImmutableStringBuilder &operator<<(uint64_t i);
  
      // This invalidates the ImmutableStringBuilder, so it should only be called once.
      operator ImmutableString();
  
      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 impl
  {
  
  constexpr inline size_t GetCharCount(uint64_t x)
  {
      size_t digits = 1;
      uint64_t max  = 10;
      for (; digits < 19; ++digits)
      {
          if (x < max)
              break;
          max *= 10;
      }
      return digits;
  }
  
  constexpr inline size_t GetCharCount(int64_t x)
  {
      if (x == INT64_MIN)
      {
          return 19 + 1;
      }
      if (x < 0)
      {
          return GetCharCount(static_cast<uint64_t>(-x)) + 1;
      }
      return GetCharCount(static_cast<uint64_t>(x));
  }
  
  constexpr inline size_t GetCharCount(int x)
  {
      return GetCharCount(static_cast<int64_t>(x));
  }
  
  constexpr inline size_t GetCharCount(unsigned x)
  {
      return GetCharCount(static_cast<int64_t>(x));
  }
  
  constexpr inline size_t GetCharCount(const ImmutableString &str)
  {
      return str.length();
  }
  
  constexpr inline size_t GetCharCount(const char *str)
  {
      return angle::ConstStrLen(str);
  }
  
  constexpr inline size_t GetCharCount(char)
  {
      return 1;
  }
  
  }  // namespace impl
  
  template <typename... Args>
  ImmutableString BuildConcatenatedImmutableString(Args... args)
  {
      ImmutableStringBuilder builder((impl::GetCharCount(args) + ...));
      (builder << ... << args);
      return builder;
  }
  
  }  // namespace sh
  
  #endif  // COMPILER_TRANSLATOR_IMMUTABLESTRINGBUILDER_H_
  

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