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502 lines
20 KiB
502 lines
20 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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// Performs validation on instructions that appear inside of a SPIR-V block.
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#include <algorithm>
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#include <cassert>
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#include <iomanip>
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#include <sstream>
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#include <string>
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#include <vector>
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#include "source/binary.h"
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#include "source/diagnostic.h"
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#include "source/enum_set.h"
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#include "source/enum_string_mapping.h"
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#include "source/extensions.h"
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#include "source/opcode.h"
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#include "source/operand.h"
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#include "source/spirv_constant.h"
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#include "source/spirv_definition.h"
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#include "source/spirv_target_env.h"
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#include "source/spirv_validator_options.h"
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#include "source/util/string_utils.h"
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#include "source/val/function.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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namespace {
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std::string ToString(const CapabilitySet& capabilities,
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const AssemblyGrammar& grammar) {
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std::stringstream ss;
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capabilities.ForEach([&grammar, &ss](SpvCapability cap) {
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spv_operand_desc desc;
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if (SPV_SUCCESS ==
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grammar.lookupOperand(SPV_OPERAND_TYPE_CAPABILITY, cap, &desc))
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ss << desc->name << " ";
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else
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ss << cap << " ";
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});
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return ss.str();
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}
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// Returns capabilities that enable an opcode. An empty result is interpreted
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// as no prohibition of use of the opcode. If the result is non-empty, then
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// the opcode may only be used if at least one of the capabilities is specified
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// by the module.
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CapabilitySet EnablingCapabilitiesForOp(const ValidationState_t& state,
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SpvOp opcode) {
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// Exceptions for SPV_AMD_shader_ballot
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switch (opcode) {
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// Normally these would require Group capability
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case SpvOpGroupIAddNonUniformAMD:
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case SpvOpGroupFAddNonUniformAMD:
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case SpvOpGroupFMinNonUniformAMD:
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case SpvOpGroupUMinNonUniformAMD:
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case SpvOpGroupSMinNonUniformAMD:
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case SpvOpGroupFMaxNonUniformAMD:
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case SpvOpGroupUMaxNonUniformAMD:
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case SpvOpGroupSMaxNonUniformAMD:
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if (state.HasExtension(kSPV_AMD_shader_ballot)) return CapabilitySet();
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break;
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default:
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break;
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}
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// Look it up in the grammar
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spv_opcode_desc opcode_desc = {};
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if (SPV_SUCCESS == state.grammar().lookupOpcode(opcode, &opcode_desc)) {
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return state.grammar().filterCapsAgainstTargetEnv(
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opcode_desc->capabilities, opcode_desc->numCapabilities);
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}
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return CapabilitySet();
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}
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// Returns SPV_SUCCESS if, for the given operand, the target environment
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// satsifies minimum version requirements, or if the module declares an
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// enabling extension for the operand. Otherwise emit a diagnostic and
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// return an error code.
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spv_result_t OperandVersionExtensionCheck(
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ValidationState_t& _, const Instruction* inst, size_t which_operand,
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const spv_operand_desc_t& operand_desc, uint32_t word) {
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const uint32_t module_version = _.version();
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const uint32_t operand_min_version = operand_desc.minVersion;
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const uint32_t operand_last_version = operand_desc.lastVersion;
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const bool reserved = operand_min_version == 0xffffffffu;
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const bool version_satisfied = !reserved &&
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(operand_min_version <= module_version) &&
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(module_version <= operand_last_version);
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if (version_satisfied) {
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return SPV_SUCCESS;
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}
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if (operand_last_version < module_version) {
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return _.diag(SPV_ERROR_WRONG_VERSION, inst)
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<< spvtools::utils::CardinalToOrdinal(which_operand)
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<< " operand of " << spvOpcodeString(inst->opcode()) << ": operand "
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<< operand_desc.name << "(" << word << ") requires SPIR-V version "
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<< SPV_SPIRV_VERSION_MAJOR_PART(operand_last_version) << "."
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<< SPV_SPIRV_VERSION_MINOR_PART(operand_last_version)
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<< " or earlier";
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}
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if (!reserved && operand_desc.numExtensions == 0) {
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return _.diag(SPV_ERROR_WRONG_VERSION, inst)
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<< spvtools::utils::CardinalToOrdinal(which_operand)
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<< " operand of " << spvOpcodeString(inst->opcode()) << ": operand "
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<< operand_desc.name << "(" << word << ") requires SPIR-V version "
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<< SPV_SPIRV_VERSION_MAJOR_PART(operand_min_version) << "."
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<< SPV_SPIRV_VERSION_MINOR_PART(operand_min_version) << " or later";
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} else {
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ExtensionSet required_extensions(operand_desc.numExtensions,
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operand_desc.extensions);
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if (!_.HasAnyOfExtensions(required_extensions)) {
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return _.diag(SPV_ERROR_MISSING_EXTENSION, inst)
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<< spvtools::utils::CardinalToOrdinal(which_operand)
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<< " operand of " << spvOpcodeString(inst->opcode())
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<< ": operand " << operand_desc.name << "(" << word
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<< ") requires one of these extensions: "
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<< ExtensionSetToString(required_extensions);
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}
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}
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return SPV_SUCCESS;
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}
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// Returns SPV_SUCCESS if the given operand is enabled by capabilities declared
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// in the module. Otherwise issues an error message and returns
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// SPV_ERROR_INVALID_CAPABILITY.
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spv_result_t CheckRequiredCapabilities(ValidationState_t& state,
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const Instruction* inst,
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size_t which_operand,
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const spv_parsed_operand_t& operand,
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uint32_t word) {
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// Mere mention of PointSize, ClipDistance, or CullDistance in a Builtin
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// decoration does not require the associated capability. The use of such
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// a variable value should trigger the capability requirement, but that's
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// not implemented yet. This rule is independent of target environment.
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// See https://github.com/KhronosGroup/SPIRV-Tools/issues/365
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if (operand.type == SPV_OPERAND_TYPE_BUILT_IN) {
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switch (word) {
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case SpvBuiltInPointSize:
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case SpvBuiltInClipDistance:
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case SpvBuiltInCullDistance:
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return SPV_SUCCESS;
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default:
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break;
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}
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} else if (operand.type == SPV_OPERAND_TYPE_FP_ROUNDING_MODE) {
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// Allow all FP rounding modes if requested
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if (state.features().free_fp_rounding_mode) {
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return SPV_SUCCESS;
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}
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} else if (operand.type == SPV_OPERAND_TYPE_GROUP_OPERATION &&
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state.features().group_ops_reduce_and_scans &&
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(word <= uint32_t(SpvGroupOperationExclusiveScan))) {
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// Allow certain group operations if requested.
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return SPV_SUCCESS;
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}
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CapabilitySet enabling_capabilities;
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spv_operand_desc operand_desc = nullptr;
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const auto lookup_result =
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state.grammar().lookupOperand(operand.type, word, &operand_desc);
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if (lookup_result == SPV_SUCCESS) {
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// Allow FPRoundingMode decoration if requested.
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if (operand.type == SPV_OPERAND_TYPE_DECORATION &&
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operand_desc->value == SpvDecorationFPRoundingMode) {
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if (state.features().free_fp_rounding_mode) return SPV_SUCCESS;
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// Vulkan API requires more capabilities on rounding mode.
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if (spvIsVulkanEnv(state.context()->target_env)) {
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enabling_capabilities.Add(SpvCapabilityStorageUniformBufferBlock16);
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enabling_capabilities.Add(SpvCapabilityStorageUniform16);
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enabling_capabilities.Add(SpvCapabilityStoragePushConstant16);
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enabling_capabilities.Add(SpvCapabilityStorageInputOutput16);
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}
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} else {
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enabling_capabilities = state.grammar().filterCapsAgainstTargetEnv(
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operand_desc->capabilities, operand_desc->numCapabilities);
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}
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// When encountering an OpCapability instruction, the instruction pass
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// registers a capability with the module *before* checking capabilities.
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// So in the case of an OpCapability instruction, don't bother checking
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// enablement by another capability.
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if (inst->opcode() != SpvOpCapability) {
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const bool enabled_by_cap =
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state.HasAnyOfCapabilities(enabling_capabilities);
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if (!enabling_capabilities.IsEmpty() && !enabled_by_cap) {
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return state.diag(SPV_ERROR_INVALID_CAPABILITY, inst)
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<< "Operand " << which_operand << " of "
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<< spvOpcodeString(inst->opcode())
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<< " requires one of these capabilities: "
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<< ToString(enabling_capabilities, state.grammar());
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}
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}
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return OperandVersionExtensionCheck(state, inst, which_operand,
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*operand_desc, word);
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}
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return SPV_SUCCESS;
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}
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// Returns SPV_ERROR_INVALID_BINARY and emits a diagnostic if the instruction
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// is explicitly reserved in the SPIR-V core spec. Otherwise return
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// SPV_SUCCESS.
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spv_result_t ReservedCheck(ValidationState_t& _, const Instruction* inst) {
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const SpvOp opcode = inst->opcode();
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switch (opcode) {
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// These instructions are enabled by a capability, but should never
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// be used anyway.
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case SpvOpImageSparseSampleProjImplicitLod:
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case SpvOpImageSparseSampleProjExplicitLod:
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case SpvOpImageSparseSampleProjDrefImplicitLod:
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case SpvOpImageSparseSampleProjDrefExplicitLod: {
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spv_opcode_desc inst_desc;
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_.grammar().lookupOpcode(opcode, &inst_desc);
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return _.diag(SPV_ERROR_INVALID_BINARY, inst)
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<< "Invalid Opcode name 'Op" << inst_desc->name << "'";
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}
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default:
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break;
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}
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return SPV_SUCCESS;
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}
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// Returns SPV_ERROR_INVALID_CAPABILITY and emits a diagnostic if the
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// instruction is invalid because the required capability isn't declared
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// in the module.
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spv_result_t CapabilityCheck(ValidationState_t& _, const Instruction* inst) {
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const SpvOp opcode = inst->opcode();
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CapabilitySet opcode_caps = EnablingCapabilitiesForOp(_, opcode);
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if (!_.HasAnyOfCapabilities(opcode_caps)) {
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return _.diag(SPV_ERROR_INVALID_CAPABILITY, inst)
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<< "Opcode " << spvOpcodeString(opcode)
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<< " requires one of these capabilities: "
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<< ToString(opcode_caps, _.grammar());
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}
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for (size_t i = 0; i < inst->operands().size(); ++i) {
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const auto& operand = inst->operand(i);
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const auto word = inst->word(operand.offset);
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if (spvOperandIsConcreteMask(operand.type)) {
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// Check for required capabilities for each bit position of the mask.
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for (uint32_t mask_bit = 0x80000000; mask_bit; mask_bit >>= 1) {
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if (word & mask_bit) {
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spv_result_t status =
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CheckRequiredCapabilities(_, inst, i + 1, operand, mask_bit);
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if (status != SPV_SUCCESS) return status;
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}
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}
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} else if (spvIsIdType(operand.type)) {
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// TODO(dneto): Check the value referenced by this Id, if we can compute
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// it. For now, just punt, to fix issue 248:
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// https://github.com/KhronosGroup/SPIRV-Tools/issues/248
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} else {
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// Check the operand word as a whole.
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spv_result_t status =
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CheckRequiredCapabilities(_, inst, i + 1, operand, word);
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if (status != SPV_SUCCESS) return status;
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}
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}
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return SPV_SUCCESS;
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}
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// Checks that the instruction can be used in this target environment's base
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// version. Assumes that CapabilityCheck has checked direct capability
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// dependencies for the opcode.
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spv_result_t VersionCheck(ValidationState_t& _, const Instruction* inst) {
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const auto opcode = inst->opcode();
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spv_opcode_desc inst_desc;
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const spv_result_t r = _.grammar().lookupOpcode(opcode, &inst_desc);
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assert(r == SPV_SUCCESS);
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(void)r;
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const auto min_version = inst_desc->minVersion;
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const auto last_version = inst_desc->lastVersion;
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const auto module_version = _.version();
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if (last_version < module_version) {
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return _.diag(SPV_ERROR_WRONG_VERSION, inst)
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<< spvOpcodeString(opcode) << " requires SPIR-V version "
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<< SPV_SPIRV_VERSION_MAJOR_PART(last_version) << "."
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<< SPV_SPIRV_VERSION_MINOR_PART(last_version) << " or earlier";
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}
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// OpTerminateInvocation is special because it is enabled by Shader
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// capability, but also requries a extension and/or version check.
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const bool capability_check_is_sufficient =
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inst->opcode() != SpvOpTerminateInvocation;
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if (capability_check_is_sufficient && (inst_desc->numCapabilities > 0u)) {
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// We already checked that the direct capability dependency has been
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// satisfied. We don't need to check any further.
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return SPV_SUCCESS;
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}
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ExtensionSet exts(inst_desc->numExtensions, inst_desc->extensions);
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if (exts.IsEmpty()) {
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// If no extensions can enable this instruction, then emit error
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// messages only concerning core SPIR-V versions if errors happen.
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if (min_version == ~0u) {
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return _.diag(SPV_ERROR_WRONG_VERSION, inst)
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<< spvOpcodeString(opcode) << " is reserved for future use.";
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}
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if (module_version < min_version) {
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return _.diag(SPV_ERROR_WRONG_VERSION, inst)
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<< spvOpcodeString(opcode) << " requires "
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<< spvTargetEnvDescription(
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static_cast<spv_target_env>(min_version))
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<< " at minimum.";
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}
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} else if (!_.HasAnyOfExtensions(exts)) {
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// Otherwise, we only error out when no enabling extensions are
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// registered.
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if (min_version == ~0u) {
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return _.diag(SPV_ERROR_MISSING_EXTENSION, inst)
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<< spvOpcodeString(opcode)
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<< " requires one of the following extensions: "
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<< ExtensionSetToString(exts);
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}
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if (module_version < min_version) {
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return _.diag(SPV_ERROR_WRONG_VERSION, inst)
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<< spvOpcodeString(opcode) << " requires SPIR-V version "
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<< SPV_SPIRV_VERSION_MAJOR_PART(min_version) << "."
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<< SPV_SPIRV_VERSION_MINOR_PART(min_version)
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<< " at minimum or one of the following extensions: "
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<< ExtensionSetToString(exts);
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}
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}
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return SPV_SUCCESS;
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}
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// Checks that the Resuld <id> is within the valid bound.
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spv_result_t LimitCheckIdBound(ValidationState_t& _, const Instruction* inst) {
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if (inst->id() >= _.getIdBound()) {
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return _.diag(SPV_ERROR_INVALID_BINARY, inst)
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<< "Result <id> '" << inst->id()
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<< "' must be less than the ID bound '" << _.getIdBound() << "'.";
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}
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return SPV_SUCCESS;
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}
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// Checks that the number of OpTypeStruct members is within the limit.
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spv_result_t LimitCheckStruct(ValidationState_t& _, const Instruction* inst) {
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if (SpvOpTypeStruct != inst->opcode()) {
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return SPV_SUCCESS;
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}
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// Number of members is the number of operands of the instruction minus 1.
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// One operand is the result ID.
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const uint16_t limit =
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static_cast<uint16_t>(_.options()->universal_limits_.max_struct_members);
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if (inst->operands().size() - 1 > limit) {
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return _.diag(SPV_ERROR_INVALID_BINARY, inst)
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<< "Number of OpTypeStruct members (" << inst->operands().size() - 1
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<< ") has exceeded the limit (" << limit << ").";
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}
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// Section 2.17 of SPIRV Spec specifies that the "Structure Nesting Depth"
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// must be less than or equal to 255.
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// This is interpreted as structures including other structures as
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// members. The code does not follow pointers or look into arrays to see
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// if we reach a structure downstream. The nesting depth of a struct is
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// 1+(largest depth of any member). Scalars are at depth 0.
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uint32_t max_member_depth = 0;
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// Struct members start at word 2 of OpTypeStruct instruction.
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for (size_t word_i = 2; word_i < inst->words().size(); ++word_i) {
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auto member = inst->word(word_i);
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auto memberTypeInstr = _.FindDef(member);
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if (memberTypeInstr && SpvOpTypeStruct == memberTypeInstr->opcode()) {
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max_member_depth = std::max(
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max_member_depth, _.struct_nesting_depth(memberTypeInstr->id()));
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}
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}
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const uint32_t depth_limit = _.options()->universal_limits_.max_struct_depth;
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const uint32_t cur_depth = 1 + max_member_depth;
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_.set_struct_nesting_depth(inst->id(), cur_depth);
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if (cur_depth > depth_limit) {
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return _.diag(SPV_ERROR_INVALID_BINARY, inst)
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<< "Structure Nesting Depth may not be larger than " << depth_limit
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<< ". Found " << cur_depth << ".";
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}
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return SPV_SUCCESS;
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}
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// Checks that the number of (literal, label) pairs in OpSwitch is within
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// the limit.
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spv_result_t LimitCheckSwitch(ValidationState_t& _, const Instruction* inst) {
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if (SpvOpSwitch == inst->opcode()) {
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// The instruction syntax is as follows:
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// OpSwitch <selector ID> <Default ID> literal label literal label ...
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// literal,label pairs come after the first 2 operands.
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// It is guaranteed at this point that num_operands is an even numner.
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size_t num_pairs = (inst->operands().size() - 2) / 2;
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const unsigned int num_pairs_limit =
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_.options()->universal_limits_.max_switch_branches;
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if (num_pairs > num_pairs_limit) {
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return _.diag(SPV_ERROR_INVALID_BINARY, inst)
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<< "Number of (literal, label) pairs in OpSwitch (" << num_pairs
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<< ") exceeds the limit (" << num_pairs_limit << ").";
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}
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}
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return SPV_SUCCESS;
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}
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// Ensure the number of variables of the given class does not exceed the
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// limit.
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spv_result_t LimitCheckNumVars(ValidationState_t& _, const uint32_t var_id,
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const SpvStorageClass storage_class) {
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if (SpvStorageClassFunction == storage_class) {
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_.registerLocalVariable(var_id);
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const uint32_t num_local_vars_limit =
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_.options()->universal_limits_.max_local_variables;
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if (_.num_local_vars() > num_local_vars_limit) {
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return _.diag(SPV_ERROR_INVALID_BINARY, nullptr)
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<< "Number of local variables ('Function' Storage Class) "
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"exceeded the valid limit ("
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<< num_local_vars_limit << ").";
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}
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} else {
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_.registerGlobalVariable(var_id);
|
|
const uint32_t num_global_vars_limit =
|
|
_.options()->universal_limits_.max_global_variables;
|
|
if (_.num_global_vars() > num_global_vars_limit) {
|
|
return _.diag(SPV_ERROR_INVALID_BINARY, nullptr)
|
|
<< "Number of Global Variables (Storage Class other than "
|
|
"'Function') exceeded the valid limit ("
|
|
<< num_global_vars_limit << ").";
|
|
}
|
|
}
|
|
return SPV_SUCCESS;
|
|
}
|
|
|
|
// Parses OpExtension instruction and logs warnings if unsuccessful.
|
|
spv_result_t CheckIfKnownExtension(ValidationState_t& _,
|
|
const Instruction* inst) {
|
|
const std::string extension_str = GetExtensionString(&(inst->c_inst()));
|
|
Extension extension;
|
|
if (!GetExtensionFromString(extension_str.c_str(), &extension)) {
|
|
return _.diag(SPV_WARNING, inst)
|
|
<< "Found unrecognized extension " << extension_str;
|
|
}
|
|
return SPV_SUCCESS;
|
|
}
|
|
|
|
} // namespace
|
|
|
|
spv_result_t InstructionPass(ValidationState_t& _, const Instruction* inst) {
|
|
const SpvOp opcode = inst->opcode();
|
|
if (opcode == SpvOpExtension) {
|
|
CheckIfKnownExtension(_, inst);
|
|
} else if (opcode == SpvOpCapability) {
|
|
_.RegisterCapability(inst->GetOperandAs<SpvCapability>(0));
|
|
} else if (opcode == SpvOpMemoryModel) {
|
|
if (_.has_memory_model_specified()) {
|
|
return _.diag(SPV_ERROR_INVALID_LAYOUT, inst)
|
|
<< "OpMemoryModel should only be provided once.";
|
|
}
|
|
_.set_addressing_model(inst->GetOperandAs<SpvAddressingModel>(0));
|
|
_.set_memory_model(inst->GetOperandAs<SpvMemoryModel>(1));
|
|
} else if (opcode == SpvOpExecutionMode) {
|
|
const uint32_t entry_point = inst->word(1);
|
|
_.RegisterExecutionModeForEntryPoint(entry_point,
|
|
SpvExecutionMode(inst->word(2)));
|
|
} else if (opcode == SpvOpVariable) {
|
|
const auto storage_class = inst->GetOperandAs<SpvStorageClass>(2);
|
|
if (auto error = LimitCheckNumVars(_, inst->id(), storage_class)) {
|
|
return error;
|
|
}
|
|
}
|
|
|
|
if (auto error = ReservedCheck(_, inst)) return error;
|
|
if (auto error = CapabilityCheck(_, inst)) return error;
|
|
if (auto error = LimitCheckIdBound(_, inst)) return error;
|
|
if (auto error = LimitCheckStruct(_, inst)) return error;
|
|
if (auto error = LimitCheckSwitch(_, inst)) return error;
|
|
if (auto error = VersionCheck(_, inst)) return error;
|
|
|
|
// All instruction checks have passed.
|
|
return SPV_SUCCESS;
|
|
}
|
|
|
|
} // namespace val
|
|
} // namespace spvtools
|