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

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• Hash : 9d737966
  Author :
  Date : 2019-08-14T12:25:12
  

  Standardize copyright notices to project style
  
  For all "ANGLE Project" copyrights, standardize to the format specified
  by the style guide. Changes:
  - "Copyright (c)" and "Copyright(c)" changed to just "Copyright".
  - Removed the second half of date ranges ("Y1Y1-Y2Y2"->"Y1Y1").
  - Fixed a small number of files that had no copyright date using the
    initial commit year from the version control history.
  - Fixed one instance of copyright being "The ANGLE Project" rather than
    "The ANGLE Project Authors"
  
  These changes are applied both to the copyright of source file, and
  where applicable to copyright statements that are generated by
  templates.
  
  BUG=angleproject:3811
  
  Change-Id: I973dd65e4ef9deeba232d5be74c768256a0eb2e5
  Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1754397
  Commit-Queue: Jamie Madill <jmadill@chromium.org>
  Reviewed-by: Jamie Madill <jmadill@chromium.org>
  

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• src/compiler/translator/HashNames.cpp

• //
  // Copyright 2017 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.
  //
  
  #include "compiler/translator/HashNames.h"
  
  #include "compiler/translator/ImmutableString.h"
  #include "compiler/translator/ImmutableStringBuilder.h"
  #include "compiler/translator/IntermNode.h"
  #include "compiler/translator/Symbol.h"
  
  namespace sh
  {
  
  namespace
  {
  constexpr const ImmutableString kHashedNamePrefix("webgl_");
  
  // Can't prefix with just _ because then we might introduce a double underscore, which is not safe
  // in GLSL (ESSL 3.00.6 section 3.8: All identifiers containing a double underscore are reserved for
  // use by the underlying implementation). u is short for user-defined.
  constexpr const ImmutableString kUnhashedNamePrefix("_u");
  
  ImmutableString HashName(const ImmutableString &name, ShHashFunction64 hashFunction)
  {
      ASSERT(!name.empty());
      ASSERT(hashFunction);
      khronos_uint64_t number = (*hashFunction)(name.data(), name.length());
  
      // Build the hashed name in place.
      static const unsigned int kHexStrMaxLength = sizeof(number) * 2;
      static const size_t kHashedNameMaxLength   = kHashedNamePrefix.length() + kHexStrMaxLength;
  
      ImmutableStringBuilder hashedName(kHashedNameMaxLength);
      hashedName << kHashedNamePrefix;
  
      hashedName.appendHex(number);
  
      return hashedName;
  }
  
  }  // anonymous namespace
  
  ImmutableString HashName(const ImmutableString &name,
                           ShHashFunction64 hashFunction,
                           NameMap *nameMap)
  {
      if (hashFunction == nullptr)
      {
          if (name.length() + kUnhashedNamePrefix.length() > kESSLMaxIdentifierLength)
          {
              // If the identifier length is already close to the limit, we can't prefix it. This is
              // not a problem since there are no builtins or ANGLE's internal variables that would
              // have as long names and could conflict.
              return name;
          }
          ImmutableStringBuilder prefixedName(kUnhashedNamePrefix.length() + name.length());
          prefixedName << kUnhashedNamePrefix << name;
          return prefixedName;
      }
      if (nameMap)
      {
          NameMap::const_iterator it = nameMap->find(name.data());
          if (it != nameMap->end())
          {
              // TODO(oetuaho): Would be nice if we didn't need to allocate a string here.
              return ImmutableString(it->second);
          }
      }
      ImmutableString hashedName = HashName(name, hashFunction);
      if (nameMap)
      {
          (*nameMap)[name.data()] = hashedName.data();
      }
      return hashedName;
  }
  
  ImmutableString HashName(const TSymbol *symbol, ShHashFunction64 hashFunction, NameMap *nameMap)
  {
      if (symbol->symbolType() == SymbolType::Empty)
      {
          return kEmptyImmutableString;
      }
      if (symbol->symbolType() == SymbolType::AngleInternal ||
          symbol->symbolType() == SymbolType::BuiltIn)
      {
          return symbol->name();
      }
      return HashName(symbol->name(), hashFunction, nameMap);
  }
  
  }  // namespace sh
  

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