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

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• Hash : 8b5e8fdb
  Author :
  Date : 2017-12-15T14:59:15
  

  Replace remaining usage of TName with TSymbol
  
  TName used to contain just a subset of the information stored in
  TSymbol. It makes more sense to use TSymbol directly instead of
  converting it to TName.
  
  This also improves type safety a bit by making some functions only
  take in TVariable or TFunction instead of the more generic TName.
  
  BUG=angleproject:2267
  TEST=angle_unittests
  
  Change-Id: Icb46923c25d33ebbbbc06ddc487da25957dda771
  Reviewed-on: https://chromium-review.googlesource.com/829143
  Commit-Queue: Olli Etuaho <oetuaho@nvidia.com>
  Reviewed-by: Jamie Madill <jmadill@chromium.org>
  

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• src/compiler/translator/HashNames.cpp

• //
  // Copyright (c) 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/IntermNode.h"
  #include "compiler/translator/Symbol.h"
  
  namespace sh
  {
  
  namespace
  {
  
  // GLSL ES 3.00.6 section 3.9: the maximum length of an identifier is 1024 characters.
  static const unsigned int kESSLMaxIdentifierLength = 1024u;
  
  static const char *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.
  static const char *kUnhashedNamePrefix              = "_u";
  static const unsigned int kUnhashedNamePrefixLength = 2u;
  
  TString HashName(const TString &name, ShHashFunction64 hashFunction)
  {
      ASSERT(!name.empty());
      ASSERT(hashFunction);
      khronos_uint64_t number = (*hashFunction)(name.c_str(), name.length());
      TStringStream stream;
      stream << kHashedNamePrefix << std::hex << number;
      TString hashedName = stream.str();
      return hashedName;
  }
  
  }  // anonymous namespace
  
  TString HashName(const TString &name, ShHashFunction64 hashFunction, NameMap *nameMap)
  {
      if (hashFunction == nullptr)
      {
          if (name.length() + kUnhashedNamePrefixLength > 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;
          }
          return kUnhashedNamePrefix + name;
      }
      if (nameMap)
      {
          NameMap::const_iterator it = nameMap->find(name.c_str());
          if (it != nameMap->end())
              return it->second.c_str();
      }
      TString hashedName = HashName(name, hashFunction);
      if (nameMap)
      {
          (*nameMap)[name.c_str()] = hashedName.c_str();
      }
      return hashedName;
  }
  
  TString HashName(const TSymbol *symbol, ShHashFunction64 hashFunction, NameMap *nameMap)
  {
      if (symbol->symbolType() == SymbolType::Empty)
      {
          return TString();
      }
      if (symbol->symbolType() == SymbolType::AngleInternal ||
          symbol->symbolType() == SymbolType::BuiltIn)
      {
          return symbol->name();
      }
      return HashName(symbol->name(), hashFunction, nameMap);
  }
  
  }  // namespace sh
  

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