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//
// 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_");
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;
}
void AddToNameMapIfNotMapped(const ImmutableString &name,
const ImmutableString &hashedName,
NameMap *nameMap)
{
if (nameMap)
{
NameMap::const_iterator it = nameMap->find(name.data());
if (it != nameMap->end())
{
// (How bout returning?)
return;
}
(*nameMap)[name.data()] = hashedName.data();
}
}
} // anonymous namespace
ImmutableString HashName(const ImmutableString &name,
ShHashFunction64 hashFunction,
NameMap *nameMap)
{
const ImmutableString kUnhashedNamePrefix(kUserDefinedNamePrefix);
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;
}
if (name == "gl_ClipDistance" || name == "gl_CullDistance" || name == "gl_LastFragData")
{
// NOTE(hqle): When gl_ClipDistance is re-declared, it will become an UserDefined
// symbol. Normally, UserDefined symbols will have "_u" prefix added to their names by
// ANGLE. However, gl_ClipDistance is an exception. If we add "_u" to its name, the
// backend won't be able to handle it properly. So for gl_ClipDistance, we won't add
// "_u" prefix, instead we return it original name.
//
// The other way is treating gl_ClipDistance as an AngleInternal symbol when a
// re-declaration occurs. AngleInternal symbols will have their name intact. However,
// the issue is that the current code put a lot of restrictions on AngleInternal
// symbols. For examples:
// - CollectVariables.cpp will not consider AngleInternal as varying output variables.
// - SymbolTable.cpp will throw an exception if AngleInternal symbols are declared by
// users. In this case, it would be gl_ClipDistance. This is because
// TSymbolTable::declare() only accepts an UserDefined symbol.
// - And potentially many other places that have some assumptions that haven't been
// discovered yet.
//
// If re-declared gl_ClipDistance was to be an AngleInternal symbol, a special "if (name
// == "gl_ClipDistance")" handling would have to be put into all the above mentioned
// cases. TParseContext::declareVariable() function would also have to be modified in
// order to assign AngleInternal symbol type to the re-declared gl_ClipDistance
// variable.
// Compare to only this place has to be handled if re-declared gl_ClipDistance is
// treated as an UserDefined symbol.
//
// Also, gl_LastFragData should be added.
//
return name;
}
ImmutableStringBuilder prefixedName(kUnhashedNamePrefix.length() + name.length());
prefixedName << kUnhashedNamePrefix << name;
ImmutableString res = prefixedName;
AddToNameMapIfNotMapped(name, res, nameMap);
return res;
}
// Has a hash function
ImmutableString hashedName = HashName(name, hashFunction);
AddToNameMapIfNotMapped(name, hashedName, nameMap);
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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