1 // Copyright (c) 2019 Google LLC.
2 //
3 // Licensed under the Apache License, Version 2.0 (the "License");
4 // you may not use this file except in compliance with the License.
5 // You may obtain a copy of the License at
6 //
7 // http://www.apache.org/licenses/LICENSE-2.0
8 //
9 // Unless required by applicable law or agreed to in writing, software
10 // distributed under the License is distributed on an "AS IS" BASIS,
11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 // See the License for the specific language governing permissions and
13 // limitations under the License.
14
15 #include "source/val/validate.h"
16
17 #include "source/val/instruction.h"
18 #include "source/val/validation_state.h"
19
20 namespace spvtools {
21 namespace val {
22
ValidateSmallTypeUses(ValidationState_t & _,const Instruction * inst)23 spv_result_t ValidateSmallTypeUses(ValidationState_t& _,
24 const Instruction* inst) {
25 if (!_.HasCapability(SpvCapabilityShader) || inst->type_id() == 0 ||
26 !_.ContainsLimitedUseIntOrFloatType(inst->type_id())) {
27 return SPV_SUCCESS;
28 }
29
30 if (_.IsPointerType(inst->type_id())) return SPV_SUCCESS;
31
32 // The validator should previously have checked ways to generate 8- or 16-bit
33 // types. So we only need to considervalid paths from source to sink.
34 // When restricted, uses of 8- or 16-bit types can only be stores,
35 // width-only conversions, decorations and copy object.
36 for (auto use : inst->uses()) {
37 const auto* user = use.first;
38 switch (user->opcode()) {
39 case SpvOpDecorate:
40 case SpvOpDecorateId:
41 case SpvOpCopyObject:
42 case SpvOpStore:
43 case SpvOpFConvert:
44 case SpvOpUConvert:
45 case SpvOpSConvert:
46 break;
47 default:
48 return _.diag(SPV_ERROR_INVALID_ID, user)
49 << "Invalid use of 8- or 16-bit result";
50 }
51 }
52
53 return SPV_SUCCESS;
54 }
55
56 } // namespace val
57 } // namespace spvtools
58