130 lines
4.7 KiB
C++
130 lines
4.7 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 <string>
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#include "source/val/instruction.h"
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#include "source/val/validate.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 spv::Op::OpFunction:
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case spv::Op::OpFunctionParameter:
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adjacency_status = IN_NEW_FUNCTION;
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break;
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case spv::Op::OpLabel:
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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 spv::Op::OpExtInst:
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// If it is a debug info instruction, we do not change the status to
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// allow debug info instructions before OpVariable in a function.
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// TODO(https://gitlab.khronos.org/spirv/SPIR-V/issues/533): We need
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// to discuss the location of DebugScope, DebugNoScope, DebugDeclare,
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// and DebugValue.
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// NOTE: This does not apply to the non-semantic vulkan debug info.
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if (!spvExtInstIsDebugInfo(inst.ext_inst_type()) ||
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inst.ext_inst_type() ==
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SPV_EXT_INST_TYPE_NONSEMANTIC_SHADER_DEBUGINFO_100) {
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adjacency_status = PHI_AND_VAR_INVALID;
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}
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break;
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case spv::Op::OpPhi:
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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 spv::Op::OpLine:
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case spv::Op::OpNoLine:
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break;
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case spv::Op::OpLoopMerge:
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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 spv::Op::OpBranch:
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case spv::Op::OpBranchConditional:
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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 spv::Op::OpSelectionMerge:
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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 spv::Op::OpBranchConditional:
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case spv::Op::OpSwitch:
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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 spv::Op::OpVariable:
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if (inst.GetOperandAs<spv::StorageClass>(2) ==
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spv::StorageClass::Function &&
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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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