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//
// 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"
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 TName &name, ShHashFunction64 hashFunction, NameMap *nameMap)
{
if (name.getString().empty() || name.isInternal())
{
return name.getString();
}
if (hashFunction == nullptr)
{
if (name.getString().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.getString();
}
return kUnhashedNamePrefix + name.getString();
}
if (nameMap)
{
NameMap::const_iterator it = nameMap->find(name.getString().c_str());
if (it != nameMap->end())
return it->second.c_str();
}
TString hashedName = HashName(name.getString(), hashFunction);
if (nameMap)
{
(*nameMap)[name.getString().c_str()] = hashedName.c_str();
}
return hashedName;
}
} // namespace sh
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