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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_manipulation_h
#define wasm_ir_manipulation_h
#include "wasm.h"
namespace wasm {
namespace ExpressionManipulator {
// Re-use a node's memory. This helps avoid allocation when optimizing.
template<typename InputType, typename OutputType>
inline OutputType* convert(InputType* input) {
static_assert(sizeof(OutputType) <= sizeof(InputType),
"Can only convert to a smaller size Expression node");
input->~InputType(); // arena-allocaed, so no destructor, but avoid UB.
OutputType* output = (OutputType*)(input);
new (output) OutputType;
return output;
}
// Convenience methods for certain instructions, which are common conversions
template<typename InputType> inline Nop* nop(InputType* target) {
auto* ret = convert<InputType, Nop>(target);
ret->finalize();
return ret;
}
template<typename InputType> inline RefNull* refNull(InputType* target) {
auto* ret = convert<InputType, RefNull>(target);
ret->finalize();
return ret;
}
template<typename InputType>
inline Unreachable* unreachable(InputType* target) {
auto* ret = convert<InputType, Unreachable>(target);
ret->finalize();
return ret;
}
// Convert a node that allocates
template<typename InputType, typename OutputType>
inline OutputType* convert(InputType* input, MixedArena& allocator) {
assert(sizeof(OutputType) <= sizeof(InputType));
input->~InputType(); // arena-allocaed, so no destructor, but avoid UB.
OutputType* output = (OutputType*)(input);
new (output) OutputType(allocator);
return output;
}
using CustomCopier = std::function<Expression*(Expression*)>;
Expression*
flexibleCopy(Expression* original, Module& wasm, CustomCopier custom);
inline Expression* copy(Expression* original, Module& wasm) {
auto copy = [](Expression* curr) { return nullptr; };
return flexibleCopy(original, wasm, copy);
}
// Splice an item into the middle of a block's list
void spliceIntoBlock(Block* block, Index index, Expression* add);
} // namespace ExpressionManipulator
} // namespace wasm
#endif // wams_ir_manipulation_h
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