blob: 95d862745420ec8b7e1e6694a479465467d2dfbb (
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
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
|
/*
* Copyright 2023 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 all EH instructions and tags. Removes catch blocks and converts
// 'throw's into 'unreachable's. Any exception thrown will crash the program as
// they are now traps.
//
#include <ir/drop.h>
#include <ir/utils.h>
namespace wasm {
namespace {
struct StripEHImpl : public WalkerPass<PostWalker<StripEHImpl>> {
bool isFunctionParallel() override { return true; }
bool refinalize = false;
std::unique_ptr<Pass> create() override {
return std::make_unique<StripEHImpl>();
}
void visitThrow(Throw* curr) {
auto& wasm = *getModule();
Builder builder(wasm);
replaceCurrent(getDroppedChildrenAndAppend(curr,
wasm,
getPassOptions(),
builder.makeUnreachable(),
DropMode::IgnoreParentEffects));
}
void visitTry(Try* curr) {
replaceCurrent(curr->body);
refinalize = true;
}
void visitTryTable(TryTable* curr) {
replaceCurrent(curr->body);
refinalize = true;
}
void visitFunction(Function* curr) {
if (refinalize) {
ReFinalize().walkFunctionInModule(curr, getModule());
}
}
};
struct StripEH : public Pass {
void run(Module* wasm) override {
PassRunner runner(wasm);
// We run this as an inner pass to make it parallel. This StripEH pass
// itself cannot be parallel because we need to disable the EH feature.
runner.add(std::make_unique<StripEHImpl>());
runner.setIsNested(true);
runner.run();
wasm->removeTags([](Tag*) { return true; });
wasm->features.disable(FeatureSet::ExceptionHandling);
}
};
} // anonymous namespace
Pass* createStripEHPass() { return new StripEH(); }
} // namespace wasm
|
