dawn-cmake/src/symbol_table.cc

82 lines
2.2 KiB
C++

// Copyright 2020 The Tint Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "src/symbol_table.h"
#include "src/debug.h"
namespace tint {
SymbolTable::SymbolTable(tint::ProgramID program_id)
: program_id_(program_id) {}
SymbolTable::SymbolTable(const SymbolTable&) = default;
SymbolTable::SymbolTable(SymbolTable&&) = default;
SymbolTable::~SymbolTable() = default;
SymbolTable& SymbolTable::operator=(const SymbolTable& other) = default;
SymbolTable& SymbolTable::operator=(SymbolTable&&) = default;
Symbol SymbolTable::Register(const std::string& name) {
TINT_ASSERT(Symbol, !name.empty());
auto it = name_to_symbol_.find(name);
if (it != name_to_symbol_.end())
return it->second;
Symbol sym(next_symbol_, program_id_);
++next_symbol_;
name_to_symbol_[name] = sym;
symbol_to_name_[sym] = name;
return sym;
}
Symbol SymbolTable::Get(const std::string& name) const {
auto it = name_to_symbol_.find(name);
return it != name_to_symbol_.end() ? it->second : Symbol();
}
std::string SymbolTable::NameFor(const Symbol symbol) const {
TINT_ASSERT_PROGRAM_IDS_EQUAL(Symbol, program_id_, symbol);
auto it = symbol_to_name_.find(symbol);
if (it == symbol_to_name_.end()) {
return symbol.to_str();
}
return it->second;
}
Symbol SymbolTable::New(std::string prefix /* = "" */) {
if (prefix.empty()) {
prefix = "tint_symbol";
}
auto it = name_to_symbol_.find(prefix);
if (it == name_to_symbol_.end()) {
return Register(prefix);
}
std::string name;
size_t i = 1;
do {
name = prefix + "_" + std::to_string(i++);
} while (name_to_symbol_.count(name));
return Register(name);
}
} // namespace tint