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// Copyright (c) 2018 LunarG Inc.
//
// 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.
// Validates correctness of the intra-block preconditions of SPIR-V
// instructions.
#include "source/val/validate.h"
#include <string>
#include "source/diagnostic.h"
#include "source/opcode.h"
#include "source/val/instruction.h"
#include "source/val/validation_state.h"
namespace spvtools {
namespace val {
spv_result_t ValidateAdjacency(ValidationState_t& _, size_t idx) {
const auto& instructions = _.ordered_instructions();
const auto& inst = instructions[idx];
switch (inst.opcode()) {
case SpvOpPhi:
if (idx > 0) {
switch (instructions[idx - 1].opcode()) {
case SpvOpLabel:
case SpvOpPhi:
case SpvOpLine:
break;
default:
return _.diag(SPV_ERROR_INVALID_DATA, &inst)
<< "OpPhi must appear before all non-OpPhi instructions "
<< "(except for OpLine, which can be mixed with OpPhi).";
}
}
break;
case SpvOpLoopMerge:
if (idx != (instructions.size() - 1)) {
switch (instructions[idx + 1].opcode()) {
case SpvOpBranch:
case SpvOpBranchConditional:
break;
default:
return _.diag(SPV_ERROR_INVALID_DATA, &inst)
<< "OpLoopMerge must immediately precede either an "
<< "OpBranch or OpBranchConditional instruction. "
<< "OpLoopMerge must be the second-to-last instruction in "
<< "its block.";
}
}
break;
case SpvOpSelectionMerge:
if (idx != (instructions.size() - 1)) {
switch (instructions[idx + 1].opcode()) {
case SpvOpBranchConditional:
case SpvOpSwitch:
break;
default:
return _.diag(SPV_ERROR_INVALID_DATA, &inst)
<< "OpSelectionMerge must immediately precede either an "
<< "OpBranchConditional or OpSwitch instruction. "
<< "OpSelectionMerge must be the second-to-last "
<< "instruction in its block.";
}
}
default:
break;
}
return SPV_SUCCESS;
}
} // namespace val
} // namespace spvtools
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