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246 lines
10 KiB
246 lines
10 KiB
// Copyright (c) 2015-2016 The Khronos Group 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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#include "source/val/validate.h"
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#include <cassert>
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#include <algorithm>
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#include <iostream>
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#include <iterator>
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#include <stack>
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#include <string>
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#include <unordered_set>
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#include <utility>
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#include <vector>
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#include "source/diagnostic.h"
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#include "source/instruction.h"
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#include "source/opcode.h"
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#include "source/operand.h"
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#include "source/spirv_validator_options.h"
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#include "source/val/function.h"
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#include "source/val/validation_state.h"
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#include "spirv-tools/libspirv.h"
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namespace spvtools {
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namespace val {
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spv_result_t UpdateIdUse(ValidationState_t& _, const Instruction* inst) {
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for (auto& operand : inst->operands()) {
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const spv_operand_type_t& type = operand.type;
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const uint32_t operand_id = inst->word(operand.offset);
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if (spvIsIdType(type) && type != SPV_OPERAND_TYPE_RESULT_ID) {
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if (auto def = _.FindDef(operand_id))
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def->RegisterUse(inst, operand.offset);
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}
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}
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return SPV_SUCCESS;
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}
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/// This function checks all ID definitions dominate their use in the CFG.
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///
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/// This function will iterate over all ID definitions that are defined in the
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/// functions of a module and make sure that the definitions appear in a
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/// block that dominates their use.
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///
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/// NOTE: This function does NOT check module scoped functions which are
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/// checked during the initial binary parse in the IdPass below
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spv_result_t CheckIdDefinitionDominateUse(ValidationState_t& _) {
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std::vector<const Instruction*> phi_instructions;
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std::unordered_set<uint32_t> phi_ids;
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for (const auto& inst : _.ordered_instructions()) {
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if (inst.id() == 0) continue;
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if (const Function* func = inst.function()) {
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if (const BasicBlock* block = inst.block()) {
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// If the Id is defined within a block then make sure all references to
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// that Id appear in a blocks that are dominated by the defining block
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for (auto& use_index_pair : inst.uses()) {
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const Instruction* use = use_index_pair.first;
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if (const BasicBlock* use_block = use->block()) {
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if (use_block->reachable() == false) continue;
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if (use->opcode() == SpvOpPhi) {
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if (phi_ids.insert(use->id()).second) {
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phi_instructions.push_back(use);
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}
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} else if (!block->dominates(*use->block())) {
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return _.diag(SPV_ERROR_INVALID_ID, use_block->label())
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<< "ID " << _.getIdName(inst.id()) << " defined in block "
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<< _.getIdName(block->id())
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<< " does not dominate its use in block "
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<< _.getIdName(use_block->id());
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}
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}
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}
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} else {
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// If the Ids defined within a function but not in a block(i.e. function
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// parameters, block ids), then make sure all references to that Id
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// appear within the same function
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for (auto use : inst.uses()) {
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const Instruction* user = use.first;
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if (user->function() && user->function() != func) {
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return _.diag(SPV_ERROR_INVALID_ID, _.FindDef(func->id()))
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<< "ID " << _.getIdName(inst.id()) << " used in function "
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<< _.getIdName(user->function()->id())
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<< " is used outside of it's defining function "
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<< _.getIdName(func->id());
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}
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}
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}
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}
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// NOTE: Ids defined outside of functions must appear before they are used
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// This check is being performed in the IdPass function
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}
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// Check all OpPhi parent blocks are dominated by the variable's defining
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// blocks
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for (const Instruction* phi : phi_instructions) {
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if (phi->block()->reachable() == false) continue;
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for (size_t i = 3; i < phi->operands().size(); i += 2) {
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const Instruction* variable = _.FindDef(phi->word(i));
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const BasicBlock* parent =
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phi->function()->GetBlock(phi->word(i + 1)).first;
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if (variable->block() && parent->reachable() &&
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!variable->block()->dominates(*parent)) {
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return _.diag(SPV_ERROR_INVALID_ID, phi)
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<< "In OpPhi instruction " << _.getIdName(phi->id()) << ", ID "
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<< _.getIdName(variable->id())
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<< " definition does not dominate its parent "
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<< _.getIdName(parent->id());
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}
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}
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}
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return SPV_SUCCESS;
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}
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// Performs SSA validation on the IDs of an instruction. The
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// can_have_forward_declared_ids functor should return true if the
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// instruction operand's ID can be forward referenced.
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spv_result_t IdPass(ValidationState_t& _, Instruction* inst) {
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auto can_have_forward_declared_ids =
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inst->opcode() == SpvOpExtInst &&
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spvExtInstIsDebugInfo(inst->ext_inst_type())
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? spvDbgInfoExtOperandCanBeForwardDeclaredFunction(
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inst->ext_inst_type(), inst->word(4))
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: spvOperandCanBeForwardDeclaredFunction(inst->opcode());
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// Keep track of a result id defined by this instruction. 0 means it
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// does not define an id.
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uint32_t result_id = 0;
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for (unsigned i = 0; i < inst->operands().size(); i++) {
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const spv_parsed_operand_t& operand = inst->operand(i);
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const spv_operand_type_t& type = operand.type;
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// We only care about Id operands, which are a single word.
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const uint32_t operand_word = inst->word(operand.offset);
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auto ret = SPV_ERROR_INTERNAL;
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switch (type) {
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case SPV_OPERAND_TYPE_RESULT_ID:
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// NOTE: Multiple Id definitions are being checked by the binary parser.
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//
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// Defer undefined-forward-reference removal until after we've analyzed
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// the remaining operands to this instruction. Deferral only matters
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// for OpPhi since it's the only case where it defines its own forward
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// reference. Other instructions that can have forward references
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// either don't define a value or the forward reference is to a function
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// Id (and hence defined outside of a function body).
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result_id = operand_word;
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// NOTE: The result Id is added (in RegisterInstruction) *after* all of
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// the other Ids have been checked to avoid premature use in the same
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// instruction.
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ret = SPV_SUCCESS;
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break;
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case SPV_OPERAND_TYPE_ID:
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case SPV_OPERAND_TYPE_MEMORY_SEMANTICS_ID:
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case SPV_OPERAND_TYPE_SCOPE_ID:
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if (const auto def = _.FindDef(operand_word)) {
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const auto opcode = inst->opcode();
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if (spvOpcodeGeneratesType(def->opcode()) &&
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!spvOpcodeGeneratesType(opcode) && !spvOpcodeIsDebug(opcode) &&
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!inst->IsDebugInfo() && !inst->IsNonSemantic() &&
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!spvOpcodeIsDecoration(opcode) && opcode != SpvOpFunction &&
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opcode != SpvOpCooperativeMatrixLengthNV &&
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!(opcode == SpvOpSpecConstantOp &&
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inst->word(3) == SpvOpCooperativeMatrixLengthNV)) {
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return _.diag(SPV_ERROR_INVALID_ID, inst)
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<< "Operand " << _.getIdName(operand_word)
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<< " cannot be a type";
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} else if (def->type_id() == 0 && !spvOpcodeGeneratesType(opcode) &&
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!spvOpcodeIsDebug(opcode) && !inst->IsDebugInfo() &&
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!inst->IsNonSemantic() && !spvOpcodeIsDecoration(opcode) &&
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!spvOpcodeIsBranch(opcode) && opcode != SpvOpPhi &&
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opcode != SpvOpExtInst && opcode != SpvOpExtInstImport &&
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opcode != SpvOpSelectionMerge &&
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opcode != SpvOpLoopMerge && opcode != SpvOpFunction &&
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opcode != SpvOpCooperativeMatrixLengthNV &&
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!(opcode == SpvOpSpecConstantOp &&
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inst->word(3) == SpvOpCooperativeMatrixLengthNV)) {
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return _.diag(SPV_ERROR_INVALID_ID, inst)
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<< "Operand " << _.getIdName(operand_word)
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<< " requires a type";
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} else if (def->IsNonSemantic() && !inst->IsNonSemantic()) {
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return _.diag(SPV_ERROR_INVALID_ID, inst)
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<< "Operand " << _.getIdName(operand_word)
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<< " in semantic instruction cannot be a non-semantic "
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"instruction";
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} else {
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ret = SPV_SUCCESS;
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}
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} else if (can_have_forward_declared_ids(i)) {
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if (spvOpcodeGeneratesType(inst->opcode()) &&
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!_.IsForwardPointer(operand_word)) {
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ret = _.diag(SPV_ERROR_INVALID_ID, inst)
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<< "Operand " << _.getIdName(operand_word)
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<< " requires a previous definition";
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} else {
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ret = _.ForwardDeclareId(operand_word);
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}
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} else {
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ret = _.diag(SPV_ERROR_INVALID_ID, inst)
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<< "ID " << _.getIdName(operand_word)
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<< " has not been defined";
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}
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break;
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case SPV_OPERAND_TYPE_TYPE_ID:
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if (_.IsDefinedId(operand_word)) {
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auto* def = _.FindDef(operand_word);
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if (!spvOpcodeGeneratesType(def->opcode())) {
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ret = _.diag(SPV_ERROR_INVALID_ID, inst)
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<< "ID " << _.getIdName(operand_word) << " is not a type id";
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} else {
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ret = SPV_SUCCESS;
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}
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} else {
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ret = _.diag(SPV_ERROR_INVALID_ID, inst)
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<< "ID " << _.getIdName(operand_word)
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<< " has not been defined";
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}
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break;
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default:
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ret = SPV_SUCCESS;
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break;
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}
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if (SPV_SUCCESS != ret) return ret;
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}
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if (result_id) _.RemoveIfForwardDeclared(result_id);
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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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