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

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• Author : Olli Etuaho
  Date : 2018-06-20 12:08:46
  Hash : d8b1c5c5
  Message : Return ImmutableString from ArrayString() This makes the compiler a few kilobytes smaller, and prepares getting rid of TString altogether. BUG=angleproject:2267 TEST=angle_unittests Change-Id: I93a003fe27b99bef72f872fa1066e2e108f934c5 Reviewed-on: https://chromium-review.googlesource.com/1107713 Reviewed-by: Jamie Madill <jmadill@chromium.org> Reviewed-by: Corentin Wallez <cwallez@chromium.org> Commit-Queue: Olli Etuaho <oetuaho@nvidia.com>

• src/compiler/translator/ImmutableStringBuilder.cpp

• //
  // 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.cpp: Stringstream-like utility for building pool allocated strings where
  // the maximum length is known in advance.
  //
  
  #include "compiler/translator/ImmutableStringBuilder.h"
  
  #include <stdio.h>
  
  namespace sh
  {
  
  ImmutableStringBuilder &ImmutableStringBuilder::operator<<(const ImmutableString &str)
  {
      ASSERT(mData != nullptr);
      ASSERT(mPos + str.length() <= mMaxLength);
      memcpy(mData + mPos, str.data(), str.length());
      mPos += str.length();
      return *this;
  }
  
  ImmutableStringBuilder &ImmutableStringBuilder::operator<<(const char *str)
  {
      ASSERT(mData != nullptr);
      size_t len = strlen(str);
      ASSERT(mPos + len <= mMaxLength);
      memcpy(mData + mPos, str, len);
      mPos += len;
      return *this;
  }
  
  ImmutableStringBuilder &ImmutableStringBuilder::operator<<(const char &c)
  {
      ASSERT(mData != nullptr);
      ASSERT(mPos + 1 <= mMaxLength);
      mData[mPos++] = c;
      return *this;
  }
  
  void ImmutableStringBuilder::appendDecimal(const uint32_t &u)
  {
      int numChars = snprintf(mData + mPos, mMaxLength - mPos, "%d", u);
      ASSERT(numChars >= 0);
      ASSERT(mPos + numChars <= mMaxLength);
      mPos += numChars;
  }
  
  ImmutableStringBuilder::operator ImmutableString()
  {
      mData[mPos] = '\0';
      ImmutableString str(static_cast<const char *>(mData), mPos);
  #if defined(ANGLE_ENABLE_ASSERTS)
      // Make sure that nothing is added to the string after it is finalized.
      mData = nullptr;
  #endif
      return str;
  }
  
  }  // namespace sh