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/*
* Copyright 2017 WebAssembly Community Group participants
*
* 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.
*/
#ifndef wasm_ir_names_h
#define wasm_ir_names_h
#include "wasm.h"
namespace wasm::Names {
// Add explicit names for function locals not yet named, and do not
// modify existing names
inline void ensureNames(Function* func) {
std::unordered_set<Name> seen;
for (auto& [_, name] : func->localNames) {
seen.insert(name);
}
Index nameIndex = seen.size();
for (Index i = 0; i < func->getNumLocals(); i++) {
if (!func->hasLocalName(i)) {
while (1) {
auto name = Name::fromInt(nameIndex++);
if (seen.emplace(name).second) {
func->localNames[i] = name;
func->localIndices[name] = i;
break;
}
}
}
}
}
// Given a root of a name, finds a valid name with perhaps a number appended
// to it, by calling a function to check if a name is valid.
//
// An optional index can be given as a hint, and if so, the search for a valid
// name will begin there. This can be used to avoid trying the same 0,1,2,..
// etc. names each time (which could lead to quadratic behavior in certain
// cases).
inline Name getValidName(Name root,
std::function<bool(Name)> check,
Index hint = 0,
std::string separator = "_") {
if (check(root)) {
return root;
}
auto prefixed = std::string(root.str) + separator;
Index num = hint;
while (1) {
auto name = prefixed + std::to_string(num);
if (check(name)) {
return name;
}
num++;
}
}
inline Name getValidExportName(Module& module, Name root) {
return getValidName(
root,
[&](Name test) { return !module.getExportOrNull(test); },
module.exports.size());
}
inline Name getValidGlobalName(Module& module, Name root) {
return getValidName(
root,
[&](Name test) { return !module.getGlobalOrNull(test); },
module.globals.size());
}
inline Name getValidFunctionName(Module& module, Name root) {
return getValidName(
root,
[&](Name test) { return !module.getFunctionOrNull(test); },
module.functions.size());
}
inline Name getValidTableName(Module& module, Name root) {
return getValidName(
root,
[&](Name test) { return !module.getTableOrNull(test); },
module.tables.size());
}
inline Name getValidTagName(Module& module, Name root) {
return getValidName(
root,
[&](Name test) { return !module.getTagOrNull(test); },
module.tags.size());
}
inline Name getValidElementSegmentName(Module& module, Name root) {
return getValidName(
root,
[&](Name test) { return !module.getElementSegmentOrNull(test); },
module.elementSegments.size());
}
inline Name getValidDataSegmentName(Module& module, Name root) {
return getValidName(
root,
[&](Name test) { return !module.getDataSegmentOrNull(test); },
module.dataSegments.size());
}
inline Name getValidMemoryName(Module& module, Name root) {
return getValidName(
root,
[&](Name test) { return !module.getMemoryOrNull(test); },
module.memories.size());
}
inline Name getValidLocalName(Function& func, Name root) {
return getValidName(
root,
[&](Name test) { return !func.hasLocalIndex(test); },
func.getNumLocals());
}
template<typename T>
inline Name getValidNameGivenExisting(Name root, const T& existingNames) {
return getValidName(
root,
[&](Name test) { return !existingNames.count(test); },
existingNames.size());
}
class MinifiedNameGenerator {
size_t state = 0;
public:
// Get a fresh minified name.
std::string getName();
};
} // namespace wasm::Names
#endif // wasm_ir_names_h
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