blob: 1b8376ea4ccff146d47d44b447dfc719bea41472 (
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
|
//
// Lowers if (x) y else z into
//
// L: {
// if (x) break (y) L
// z
// }
//
// This is useful for investigating how beneficial if_else is.
//
#include <memory>
#include <wasm.h>
#include <pass.h>
namespace wasm {
struct LowerIfElse : public Pass {
MixedArena* allocator;
std::unique_ptr<NameManager> namer;
void prepare(PassRunner* runner, Module *module) override {
allocator = runner->allocator;
namer = std::unique_ptr<NameManager>(new NameManager());
namer->run(runner, module);
}
void visitIf(If *curr) override {
if (curr->ifFalse) {
auto block = allocator->alloc<Block>();
auto name = namer->getUnique("L"); // TODO: getUniqueInFunction
block->name = name;
block->list.push_back(curr);
block->list.push_back(curr->ifFalse);
curr->ifFalse = nullptr;
auto break_ = allocator->alloc<Break>();
break_->name = name;
break_->value = curr->ifTrue;
curr->ifTrue = break_;
replaceCurrent(block);
}
}
};
static RegisterPass<LowerIfElse> registerPass("lower-if-else", "lowers if-elses into ifs, blocks and branches");
} // namespace wasm
|
