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/*
* Copyright 2016 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.
*/
#include "wabt/binding-hash.h"
#include <algorithm>
#include <vector>
#include "wabt/ir.h"
namespace wabt {
void BindingHash::FindDuplicates(DuplicateCallback callback) const {
if (size() > 0) {
ValueTypeVector duplicates;
CreateDuplicatesVector(&duplicates);
SortDuplicatesVectorByLocation(&duplicates);
CallCallbacks(duplicates, callback);
}
}
Index BindingHash::FindIndex(const Var& var) const {
if (var.is_name()) {
return FindIndex(var.name());
}
return var.index();
}
void BindingHash::CreateDuplicatesVector(
ValueTypeVector* out_duplicates) const {
// This relies on the fact that in an unordered_multimap, all values with the
// same key are adjacent in iteration order.
auto first = begin();
bool is_first = true;
for (auto iter = std::next(first); iter != end(); ++iter) {
if (first->first == iter->first) {
if (is_first) {
out_duplicates->push_back(&*first);
}
out_duplicates->push_back(&*iter);
is_first = false;
} else {
is_first = true;
first = iter;
}
}
}
void BindingHash::SortDuplicatesVectorByLocation(
ValueTypeVector* duplicates) const {
std::sort(
duplicates->begin(), duplicates->end(),
[](const value_type* lhs, const value_type* rhs) -> bool {
return lhs->second.loc.line < rhs->second.loc.line ||
(lhs->second.loc.line == rhs->second.loc.line &&
lhs->second.loc.first_column < rhs->second.loc.first_column);
});
}
void BindingHash::CallCallbacks(const ValueTypeVector& duplicates,
DuplicateCallback callback) const {
// Loop through all duplicates in order, and call callback with first
// occurrence.
for (auto iter = duplicates.begin(), end = duplicates.end(); iter != end;
++iter) {
auto first = std::find_if(duplicates.begin(), duplicates.end(),
[iter](const value_type* x) -> bool {
return x->first == (*iter)->first;
});
if (first == iter) {
continue;
}
assert(first != duplicates.end());
callback(**first, **iter);
}
}
} // namespace wabt
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