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
|
/*
* Copyright 2017 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_literal_utils_h
#define wasm_ir_literal_utils_h
#include "wasm-builder.h"
#include "wasm.h"
namespace wasm::LiteralUtils {
inline Expression* makeFromInt32(int32_t x, Type type, Module& wasm) {
auto* ret = wasm.allocator.alloc<Const>();
ret->value = Literal::makeFromInt32(x, type);
ret->type = type;
return ret;
}
inline bool canMakeZero(Type type) {
if (type.isNonNullable()) {
return false;
}
if (type.isRtt() && type.getRtt().hasDepth()) {
// An rtt with depth cannot be constructed as a simple zero: we'd need to
// create not just a zero (an rtt.canon) but also some rtt.subs that add to
// the depth, so disallow that. Also, there is no practical way to create a
// zero Literal for such a type, as we'd need to supply the list of super
// types somehow, and creating a zero Literal is how makeZero works.
return false;
}
if (type.isTuple()) {
for (auto t : type) {
if (!canMakeZero(t)) {
return false;
}
}
}
return true;
}
inline Expression* makeZero(Type type, Module& wasm) {
assert(canMakeZero(type));
// TODO: Remove this function once V8 supports v128.const
// (https://bugs.chromium.org/p/v8/issues/detail?id=8460)
Builder builder(wasm);
if (type == Type::v128) {
return builder.makeUnary(SplatVecI32x4, builder.makeConst(int32_t(0)));
}
return builder.makeConstantExpression(Literal::makeZeros(type));
}
} // namespace wasm::LiteralUtils
#endif // wasm_ir_literal_utils_h
|
