blob: 9c0b4a83f8f7c3fb501da5ea498abdf4a328b506 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
|
/*
* 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.
*/
//
// Removes names from locations that are never branched to.
//
#include <wasm.h>
#include <pass.h>
namespace wasm {
struct RemoveUnusedNames : public Pass {
std::set<Name> used;
void prepare(PassRunner* runner, Module *module) override {
struct Scanner : public WasmWalker {
std::set<Name>& used;
Scanner(std::set<Name>& used) : used(used) {}
void visitBreak(Break *curr) override {
used.insert(curr->name);
}
};
Scanner scanner(used);
scanner.startWalk(module);
}
void visitBlock(Block *curr) override {
if (curr->name.is() && used.count(curr->name) == 0) {
curr->name = Name();
}
}
};
static RegisterPass<RemoveUnusedNames> registerPass("remove-unused-names", "removes names from locations that are never branched to");
} // namespace wasm
|
