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/*
* Copyright 2015 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_pass_h
#define wasm_pass_h
#include <functional>
#include "wasm.h"
#include "mixed_arena.h"
namespace wasm {
class Pass;
//
// Global registry of all passes in /passes/
//
struct PassRegistry {
static PassRegistry* get();
typedef std::function<Pass* ()> Creator;
void registerPass(const char* name, const char *description, Creator create);
Pass* createPass(std::string name);
std::vector<std::string> getRegisteredNames();
std::string getPassDescription(std::string name);
private:
struct PassInfo {
std::string description;
Creator create;
PassInfo() {}
PassInfo(std::string description, Creator create) : description(description), create(create) {}
};
std::map<std::string, PassInfo> passInfos;
};
//
// Utility class to register a pass. See pass files for usage.
//
template<class P>
struct RegisterPass {
RegisterPass(const char* name, const char *description) {
PassRegistry::get()->registerPass(name, description, []() {
return new P();
});
}
};
//
// Runs a set of passes, in order
//
struct PassRunner {
MixedArena* allocator;
std::vector<Pass*> passes;
Pass* currPass;
PassRunner(MixedArena* allocator) : allocator(allocator) {}
void add(std::string passName) {
auto pass = PassRegistry::get()->createPass(passName);
assert(pass);
passes.push_back(pass);
}
template<class P>
void add() {
passes.push_back(new P());
}
template<class P, class Arg>
void add(Arg& arg){
passes.push_back(new P(arg));
}
void run(Module* module);
// Get the last pass that was already executed of a certain type.
template<class P>
P* getLast();
~PassRunner();
};
//
// Core pass class
//
class Pass {
public:
virtual ~Pass() {};
// Override this to perform preparation work before the pass runs.
virtual void prepare(PassRunner* runner, Module* module) {}
virtual void run(PassRunner* runner, Module* module) = 0;
// Override this to perform finalization work after the pass runs.
virtual void finalize(PassRunner* runner, Module* module) {}
protected:
Pass() {}
Pass(Pass &) {}
Pass &operator=(const Pass&) = delete;
};
//
// Core pass class that uses AST walking. This class can be parameterized by
// different types of AST walkers.
//
template <typename WalkerType>
class WalkerPass : public Pass, public WalkerType {
public:
void run(PassRunner* runner, Module* module) override {
prepare(runner, module);
WalkerType::startWalk(module);
finalize(runner, module);
}
};
// Standard passes. All passes in /passes/ are runnable from the shell,
// but registering them here in addition allows them to communicate
// e.g. through PassRunner::getLast
// Handles names in a module, in particular adding names without duplicates
class NameManager : public WalkerPass<WasmWalker<NameManager>> {
public:
Name getUnique(std::string prefix);
// TODO: getUniqueInFunction
// visitors
void visitBlock(Block* curr);
void visitLoop(Loop* curr);
void visitBreak(Break* curr);
void visitSwitch(Switch* curr);
void visitCall(Call* curr);
void visitCallImport(CallImport* curr);
void visitFunctionType(FunctionType* curr);
void visitFunction(Function* curr);
void visitImport(Import* curr);
void visitExport(Export* curr);
private:
std::set<Name> names;
size_t counter = 0;
};
// Prints out a module
class Printer : public Pass {
protected:
std::ostream& o;
public:
Printer() : o(std::cout) {}
Printer(std::ostream& o) : o(o) {}
void run(PassRunner* runner, Module* module) override;
};
// Prints out a minified module
class MinifiedPrinter : public Printer {
public:
MinifiedPrinter() : Printer() {}
MinifiedPrinter(std::ostream& o) : Printer(o) {}
void run(PassRunner* runner, Module* module) override;
};
} // namespace wasm
#endif // wasm_pass_h
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