SPIRV-Tools/source/validate_decorations.cpp

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// Copyright (c) 2017 Google 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.
#include "validate.h"
#include <algorithm>
#include <string>
#include "diagnostic.h"
#include "opcode.h"
#include "val/validation_state.h"
using libspirv::Decoration;
using libspirv::DiagnosticStream;
using libspirv::Instruction;
using libspirv::ValidationState_t;
namespace {
// Returns whether the given structure type has any members with BuiltIn
// decoration.
bool isBuiltInStruct(uint32_t struct_id, ValidationState_t& vstate) {
const auto& decorations = vstate.id_decorations(struct_id);
return std::any_of(
decorations.begin(), decorations.end(), [](const Decoration& d) {
return SpvDecorationBuiltIn == d.dec_type() &&
Decoration::kInvalidMember != d.struct_member_index();
});
}
// Returns true if the given ID has the Import LinkageAttributes decoration.
bool hasImportLinkageAttribute(uint32_t id, ValidationState_t& vstate) {
const auto& decorations = vstate.id_decorations(id);
return std::any_of(decorations.begin(), decorations.end(),
[](const Decoration& d) {
return SpvDecorationLinkageAttributes == d.dec_type() &&
d.params().size() >= 2u &&
d.params().back() == SpvLinkageTypeImport;
});
}
spv_result_t CheckLinkageAttrOfFunctions(ValidationState_t& vstate) {
for (const auto& function : vstate.functions()) {
if (function.block_count() == 0u) {
// A function declaration (an OpFunction with no basic blocks), must have
// a Linkage Attributes Decoration with the Import Linkage Type.
if (!hasImportLinkageAttribute(function.id(), vstate)) {
return vstate.diag(SPV_ERROR_INVALID_BINARY)
<< "Function declaration (id " << function.id()
<< ") must have a LinkageAttributes decoration with the Import "
"Linkage type.";
}
} else {
if (hasImportLinkageAttribute(function.id(), vstate)) {
return vstate.diag(SPV_ERROR_INVALID_BINARY)
<< "Function definition (id " << function.id()
<< ") may not be decorated with Import Linkage type.";
}
}
}
return SPV_SUCCESS;
}
// Checks whether an imported variable is initialized by this module.
spv_result_t CheckImportedVariableInitialization(ValidationState_t& vstate) {
// According the SPIR-V Spec 2.16.1, it is illegal to initialize an imported
// variable. This means that a module-scope OpVariable with initialization
// value cannot be marked with the Import Linkage Type (import type id = 1).
for (auto global_var_id : vstate.global_vars()) {
// Initializer <id> is an optional argument for OpVariable. If initializer
// <id> is present, the instruction will have 5 words.
auto variable_instr = vstate.FindDef(global_var_id);
if (variable_instr->words().size() == 5u &&
hasImportLinkageAttribute(global_var_id, vstate)) {
return vstate.diag(SPV_ERROR_INVALID_ID)
<< "A module-scope OpVariable with initialization value "
"cannot be marked with the Import Linkage Type.";
}
}
return SPV_SUCCESS;
}
// Checks whether proper decorations have been appied to the entry points.
spv_result_t CheckDecorationsOfEntryPoints(ValidationState_t& vstate) {
for (uint32_t entry_point : vstate.entry_points()) {
const auto& interfaces = vstate.entry_point_interfaces(entry_point);
int num_builtin_inputs = 0;
int num_builtin_outputs = 0;
for (auto interface : interfaces) {
Instruction* var_instr = vstate.FindDef(interface);
if (SpvOpVariable != var_instr->opcode()) {
return vstate.diag(SPV_ERROR_INVALID_ID)
<< "Interfaces passed to OpEntryPoint must be of type "
"OpTypeVariable. Found Op"
<< spvOpcodeString(static_cast<SpvOp>(var_instr->opcode()))
<< ".";
}
const uint32_t ptr_id = var_instr->word(1);
Instruction* ptr_instr = vstate.FindDef(ptr_id);
// It is guaranteed (by validator ID checks) that ptr_instr is
// OpTypePointer. Word 3 of this instruction is the type being pointed to.
const uint32_t type_id = ptr_instr->word(3);
Instruction* type_instr = vstate.FindDef(type_id);
const auto storage_class =
static_cast<SpvStorageClass>(var_instr->word(3));
if (storage_class != SpvStorageClassInput &&
storage_class != SpvStorageClassOutput) {
return vstate.diag(SPV_ERROR_INVALID_ID)
<< "OpEntryPoint interfaces must be OpVariables with "
"Storage Class of Input(1) or Output(3). Found Storage Class "
<< storage_class << " for Entry Point id " << entry_point << ".";
}
if (type_instr && SpvOpTypeStruct == type_instr->opcode() &&
isBuiltInStruct(type_id, vstate)) {
if (storage_class == SpvStorageClassInput) ++num_builtin_inputs;
if (storage_class == SpvStorageClassOutput) ++num_builtin_outputs;
if (num_builtin_inputs > 1 || num_builtin_outputs > 1) break;
}
}
if (num_builtin_inputs > 1 || num_builtin_outputs > 1) {
return vstate.diag(SPV_ERROR_INVALID_BINARY)
<< "There must be at most one object per Storage Class that can "
"contain a structure type containing members decorated with "
"BuiltIn, consumed per entry-point. Entry Point id "
<< entry_point << " does not meet this requirement.";
}
// The LinkageAttributes Decoration cannot be applied to functions targeted
// by an OpEntryPoint instruction
for (auto& decoration : vstate.id_decorations(entry_point)) {
if (SpvDecorationLinkageAttributes == decoration.dec_type()) {
const char* linkage_name =
reinterpret_cast<const char*>(&decoration.params()[0]);
return vstate.diag(SPV_ERROR_INVALID_BINARY)
<< "The LinkageAttributes Decoration (Linkage name: "
<< linkage_name << ") cannot be applied to function id "
<< entry_point
<< " because it is targeted by an OpEntryPoint instruction.";
}
}
}
return SPV_SUCCESS;
}
} // anonymous namespace
namespace libspirv {
// Validates that decorations have been applied properly.
spv_result_t ValidateDecorations(ValidationState_t& vstate) {
if (auto error = CheckImportedVariableInitialization(vstate)) return error;
if (auto error = CheckDecorationsOfEntryPoints(vstate)) return error;
if (auto error = CheckLinkageAttrOfFunctions(vstate)) return error;
return SPV_SUCCESS;
}
} // namespace libspirv