mirror of
https://github.com/KhronosGroup/SPIRV-Tools
synced 2024-10-18 19:20:05 +00:00
c37388f1ad
These are bookend passes designed to help preserve line information across passes which delete, move and clone instructions. The propagation pass attaches a debug line instruction to every instruction based on SPIR-V line propagation rules. It should be performed before optimization. The redundant line elimination pass eliminates all line instructions which match the previous line instruction. This pass should be performed at the end of optimization to reduce physical SPIR-V file size. Fixes #2027.
119 lines
4.0 KiB
C++
119 lines
4.0 KiB
C++
// Copyright (c) 2018 LunarG Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// Validates correctness of the intra-block preconditions of SPIR-V
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// instructions.
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#include "source/val/validate.h"
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#include <string>
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#include "source/diagnostic.h"
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#include "source/opcode.h"
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#include "source/val/instruction.h"
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#include "source/val/validation_state.h"
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namespace spvtools {
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namespace val {
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enum {
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// Status right after meeting OpFunction.
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IN_NEW_FUNCTION,
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// Status right after meeting the entry block.
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IN_ENTRY_BLOCK,
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// Status right after meeting non-entry blocks.
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PHI_VALID,
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// Status right after meeting non-OpVariable instructions in the entry block
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// or non-OpPhi instructions in non-entry blocks, except OpLine.
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PHI_AND_VAR_INVALID,
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};
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spv_result_t ValidateAdjacency(ValidationState_t& _) {
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const auto& instructions = _.ordered_instructions();
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int adjacency_status = PHI_AND_VAR_INVALID;
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for (size_t i = 0; i < instructions.size(); ++i) {
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const auto& inst = instructions[i];
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switch (inst.opcode()) {
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case SpvOpFunction:
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case SpvOpFunctionParameter:
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adjacency_status = IN_NEW_FUNCTION;
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break;
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case SpvOpLabel:
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adjacency_status =
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adjacency_status == IN_NEW_FUNCTION ? IN_ENTRY_BLOCK : PHI_VALID;
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break;
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case SpvOpPhi:
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if (adjacency_status != PHI_VALID) {
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return _.diag(SPV_ERROR_INVALID_DATA, &inst)
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<< "OpPhi must appear within a non-entry block before all "
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<< "non-OpPhi instructions "
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<< "(except for OpLine, which can be mixed with OpPhi).";
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}
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break;
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case SpvOpLine:
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case SpvOpNoLine:
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break;
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case SpvOpLoopMerge:
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adjacency_status = PHI_AND_VAR_INVALID;
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if (i != (instructions.size() - 1)) {
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switch (instructions[i + 1].opcode()) {
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case SpvOpBranch:
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case SpvOpBranchConditional:
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break;
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default:
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return _.diag(SPV_ERROR_INVALID_DATA, &inst)
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<< "OpLoopMerge must immediately precede either an "
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<< "OpBranch or OpBranchConditional instruction. "
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<< "OpLoopMerge must be the second-to-last instruction in "
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<< "its block.";
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}
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}
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break;
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case SpvOpSelectionMerge:
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adjacency_status = PHI_AND_VAR_INVALID;
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if (i != (instructions.size() - 1)) {
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switch (instructions[i + 1].opcode()) {
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case SpvOpBranchConditional:
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case SpvOpSwitch:
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break;
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default:
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return _.diag(SPV_ERROR_INVALID_DATA, &inst)
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<< "OpSelectionMerge must immediately precede either an "
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<< "OpBranchConditional or OpSwitch instruction. "
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<< "OpSelectionMerge must be the second-to-last "
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<< "instruction in its block.";
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}
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}
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break;
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case SpvOpVariable:
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if (inst.GetOperandAs<SpvStorageClass>(2) == SpvStorageClassFunction &&
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adjacency_status != IN_ENTRY_BLOCK) {
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return _.diag(SPV_ERROR_INVALID_DATA, &inst)
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<< "All OpVariable instructions in a function must be the "
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"first instructions in the first block.";
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}
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break;
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default:
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adjacency_status = PHI_AND_VAR_INVALID;
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break;
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}
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}
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return SPV_SUCCESS;
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}
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} // namespace val
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} // namespace spvtools
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