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// Copyright (c) 2018 Google LLC.
//
// 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 "source/val/validate.h"
#include <algorithm>
#include <vector>
#include "source/diagnostic.h"
#include "source/val/function.h"
#include "source/val/instruction.h"
#include "source/val/validation_state.h"
namespace spvtools {
namespace val {
namespace {
// Returns true if \c inst is an input or output variable.
bool is_interface_variable(const Instruction* inst) {
return inst->opcode() == SpvOpVariable &&
(inst->word(3u) == SpvStorageClassInput ||
inst->word(3u) == SpvStorageClassOutput);
}
// Checks that \c var is listed as an interface in all the entry points that use
// it.
spv_result_t check_interface_variable(ValidationState_t& _,
const Instruction* var) {
std::vector<const Function*> functions;
std::vector<const Instruction*> uses;
for (auto use : var->uses()) {
uses.push_back(use.first);
}
for (uint32_t i = 0; i < uses.size(); ++i) {
const auto user = uses[i];
if (const Function* func = user->function()) {
functions.push_back(func);
} else {
// In the rare case that the variable is used by another instruction in
// the global scope, continue searching for an instruction used in a
// function.
for (auto use : user->uses()) {
uses.push_back(use.first);
}
}
}
std::sort(functions.begin(), functions.end(),
[](const Function* lhs, const Function* rhs) {
return lhs->id() < rhs->id();
});
functions.erase(std::unique(functions.begin(), functions.end()),
functions.end());
std::vector<uint32_t> entry_points;
for (const auto func : functions) {
for (auto id : _.FunctionEntryPoints(func->id())) {
entry_points.push_back(id);
}
}
std::sort(entry_points.begin(), entry_points.end());
entry_points.erase(std::unique(entry_points.begin(), entry_points.end()),
entry_points.end());
for (auto id : entry_points) {
for (const auto& desc : _.entry_point_descriptions(id)) {
bool found = false;
for (auto interface : desc.interfaces) {
if (var->id() == interface) {
found = true;
break;
}
}
if (!found) {
return _.diag(SPV_ERROR_INVALID_ID, var)
<< (var->word(3u) == SpvStorageClassInput ? "Input" : "Output")
<< " variable id <" << var->id() << "> is used by entry point '"
<< desc.name << "' id <" << id
<< ">, but is not listed as an interface";
}
}
}
return SPV_SUCCESS;
}
} // namespace
spv_result_t ValidateInterfaces(ValidationState_t& _) {
for (auto& inst : _.ordered_instructions()) {
if (is_interface_variable(&inst)) {
if (auto error = check_interface_variable(_, &inst)) {
return error;
}
}
}
return SPV_SUCCESS;
}
} // namespace val
} // namespace spvtools