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/*
* Copyright 2019 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_debuginfo_h
#define wasm_ir_debuginfo_h
#include "wasm.h"
namespace wasm::debuginfo {
// Given an original expression and another that replaces it, copy the debuginfo
// from the former to the latter. Note the expression may not be an exclusive
// replacement of the other (the other may be replaced by several expressions,
// all of whom may end up with the same debug info).
inline void copyOriginalToReplacement(Expression* original,
Expression* replacement,
Function* func) {
auto& debugLocations = func->debugLocations;
// Early exit if there is no debug info at all. Also, leave if we already
// have debug info on the new replacement, which we don't want to trample:
// if there is no debug info we do want to copy, as a replacement operation
// suggests the new code plays the same role (it is an optimized version of
// the old), but if the code is already annotated, trust that.
if (debugLocations.empty() || debugLocations.count(replacement)) {
return;
}
auto iter = debugLocations.find(original);
if (iter != debugLocations.end()) {
debugLocations[replacement] = iter->second;
// Note that we do *not* erase the debug info of the expression being
// replaced, because it may still exist: we might replace
//
// (call
// (block ..
//
// with
//
// (block
// (call ..
//
// We still want the call here to have its old debug info.
//
// (In most cases, of course, we do remove the replaced expression,
// which means we accumulate unused garbage in debugLocations, but
// that's not that bad; we use arena allocation for Expressions, after
// all.)
}
}
// Given an expression and a copy of it in another function, copy the debug
// info into the second function.
void copyBetweenFunctions(Expression* origin,
Expression* copy,
Function* originFunc,
Function* copyFunc);
} // namespace wasm::debuginfo
#endif // wasm_ir_debuginfo_h
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