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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 {
enum {
// Status right after meeting OpFunction.
IN_NEW_FUNCTION,
// Status right after meeting the entry block.
IN_ENTRY_BLOCK,
// Status right after meeting non-entry blocks.
PHI_VALID,
// Status right after meeting non-OpVariable instructions in the entry block
// or non-OpPhi instructions in non-entry blocks, except OpLine.
PHI_AND_VAR_INVALID,
};
spv_result_t ValidateAdjacency(ValidationState_t& _) {
const auto& instructions = _.ordered_instructions();
int adjacency_status = PHI_AND_VAR_INVALID;
for (size_t i = 0; i < instructions.size(); ++i) {
const auto& inst = instructions[i];
switch (inst.opcode()) {
case SpvOpFunction:
case SpvOpFunctionParameter:
adjacency_status = IN_NEW_FUNCTION;
break;
case SpvOpLabel:
adjacency_status =
adjacency_status == IN_NEW_FUNCTION ? IN_ENTRY_BLOCK : PHI_VALID;
break;
case SpvOpExtInst:
// If it is a debug info instruction, we do not change the status to
// allow debug info instructions before OpVariable in a function.
// TODO(https://gitlab.khronos.org/spirv/SPIR-V/issues/533): We need
// to discuss the location of DebugScope, DebugNoScope, DebugDeclare,
// and DebugValue.
// NOTE: This does not apply to the non-semantic vulkan debug info.
if (!spvExtInstIsDebugInfo(inst.ext_inst_type()) ||
inst.ext_inst_type() ==
SPV_EXT_INST_TYPE_NONSEMANTIC_SHADER_DEBUGINFO_100) {
adjacency_status = PHI_AND_VAR_INVALID;
}
break;
case SpvOpPhi:
if (adjacency_status != PHI_VALID) {
return _.diag(SPV_ERROR_INVALID_DATA, &inst)
<< "OpPhi must appear within a non-entry block before all "
<< "non-OpPhi instructions "
<< "(except for OpLine, which can be mixed with OpPhi).";
}
break;
case SpvOpLine:
case SpvOpNoLine:
break;
case SpvOpLoopMerge:
adjacency_status = PHI_AND_VAR_INVALID;
if (i != (instructions.size() - 1)) {
switch (instructions[i + 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:
adjacency_status = PHI_AND_VAR_INVALID;
if (i != (instructions.size() - 1)) {
switch (instructions[i + 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.";
}
}
break;
case SpvOpVariable:
if (inst.GetOperandAs<SpvStorageClass>(2) == SpvStorageClassFunction &&
adjacency_status != IN_ENTRY_BLOCK) {
return _.diag(SPV_ERROR_INVALID_DATA, &inst)
<< "All OpVariable instructions in a function must be the "
"first instructions in the first block.";
}
break;
default:
adjacency_status = PHI_AND_VAR_INVALID;
break;
}
}
return SPV_SUCCESS;
}
} // namespace val
} // namespace spvtools
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