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

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• Hash : fe8c0390
  Author :
  Date : 2024-09-25T19:00:34
  

  WGSL: Run SeparateCompoundStructDeclarations to name structs
  
  Borrow SeparateCompoundStructDeclarations from the Metal backend to
  separate struct definitions and name nameless structs.
  
  Refactor id generation into a callback.
  
  Bug: angleproject:42267100
  Change-Id: I8ed6f13113a5d5e450d30ce187ce1df52e572000
  Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/5889089
  Commit-Queue: Geoff Lang <geofflang@chromium.org>
  Reviewed-by: Matthew Denton <mpdenton@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_
  
  #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);
  
      // This invalidates the ImmutableStringBuilder, so it should only be called once.
      operator ImmutableString();
  
      void appendDecimal(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 impl
  {
  inline size_t GetArgLength(const ImmutableString &str)
  {
      return str.length();
  }
  
  inline size_t GetArgLength(const char *str)
  {
      return strlen(str);
  }
  
  inline size_t GetArgLength(int number)
  {
      std::ostringstream oss;
      oss << number;
      return oss.str().length();
  }
  
  inline size_t GetArgsTotalSize()
  {
      return 0;
  }
  
  template <typename T, typename... Rest>
  inline size_t GetArgsTotalSize(const T &firstArg, Rest... rest)
  {
      return GetArgLength(firstArg) + GetArgsTotalSize(rest...);
  }
  
  inline void AppendStrings(ImmutableStringBuilder &builder) {}
  
  template <typename T, typename... Rest>
  inline void AppendStrings(ImmutableStringBuilder &builder, const T &firstArg, Rest... rest)
  {
      builder << firstArg;
      AppendStrings(builder, rest...);
  }
  }  // namespace impl
  
  template <typename... Args>
  ImmutableString BuildConcatenatedImmutableString(Args... args)
  {
      ImmutableStringBuilder builder(impl::GetArgsTotalSize(args...));
      impl::AppendStrings(builder, args...);
      return builder;
  }
  
  }  // namespace sh
  
  #endif  // COMPILER_TRANSLATOR_IMMUTABLESTRINGBUILDER_H_
  

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