SPIRV-Tools/source/val/basic_block.cpp
alan-baker 7221ccf85e
Fix reachability in the validator (#3541)
Fixes #3529

* Make BasicBlock::reachable() only consider static reachability
* Fix reachability calculation to be independent of block order
* add tests
2020-07-15 21:27:03 -04:00

144 lines
4.1 KiB
C++

// Copyright (c) 2015-2016 The Khronos Group 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 "source/val/basic_block.h"
#include <algorithm>
#include <utility>
#include <vector>
namespace spvtools {
namespace val {
BasicBlock::BasicBlock(uint32_t label_id)
: id_(label_id),
immediate_dominator_(nullptr),
immediate_post_dominator_(nullptr),
predecessors_(),
successors_(),
type_(0),
reachable_(false),
label_(nullptr),
terminator_(nullptr) {}
void BasicBlock::SetImmediateDominator(BasicBlock* dom_block) {
immediate_dominator_ = dom_block;
}
void BasicBlock::SetImmediatePostDominator(BasicBlock* pdom_block) {
immediate_post_dominator_ = pdom_block;
}
const BasicBlock* BasicBlock::immediate_dominator() const {
return immediate_dominator_;
}
const BasicBlock* BasicBlock::immediate_post_dominator() const {
return immediate_post_dominator_;
}
BasicBlock* BasicBlock::immediate_dominator() { return immediate_dominator_; }
BasicBlock* BasicBlock::immediate_post_dominator() {
return immediate_post_dominator_;
}
void BasicBlock::RegisterSuccessors(
const std::vector<BasicBlock*>& next_blocks) {
for (auto& block : next_blocks) {
block->predecessors_.push_back(this);
successors_.push_back(block);
}
}
bool BasicBlock::dominates(const BasicBlock& other) const {
return (this == &other) ||
!(other.dom_end() ==
std::find(other.dom_begin(), other.dom_end(), this));
}
bool BasicBlock::postdominates(const BasicBlock& other) const {
return (this == &other) ||
!(other.pdom_end() ==
std::find(other.pdom_begin(), other.pdom_end(), this));
}
BasicBlock::DominatorIterator::DominatorIterator() : current_(nullptr) {}
BasicBlock::DominatorIterator::DominatorIterator(
const BasicBlock* block,
std::function<const BasicBlock*(const BasicBlock*)> dominator_func)
: current_(block), dom_func_(dominator_func) {}
BasicBlock::DominatorIterator& BasicBlock::DominatorIterator::operator++() {
if (current_ == dom_func_(current_)) {
current_ = nullptr;
} else {
current_ = dom_func_(current_);
}
return *this;
}
const BasicBlock::DominatorIterator BasicBlock::dom_begin() const {
return DominatorIterator(
this, [](const BasicBlock* b) { return b->immediate_dominator(); });
}
BasicBlock::DominatorIterator BasicBlock::dom_begin() {
return DominatorIterator(
this, [](const BasicBlock* b) { return b->immediate_dominator(); });
}
const BasicBlock::DominatorIterator BasicBlock::dom_end() const {
return DominatorIterator();
}
BasicBlock::DominatorIterator BasicBlock::dom_end() {
return DominatorIterator();
}
const BasicBlock::DominatorIterator BasicBlock::pdom_begin() const {
return DominatorIterator(
this, [](const BasicBlock* b) { return b->immediate_post_dominator(); });
}
BasicBlock::DominatorIterator BasicBlock::pdom_begin() {
return DominatorIterator(
this, [](const BasicBlock* b) { return b->immediate_post_dominator(); });
}
const BasicBlock::DominatorIterator BasicBlock::pdom_end() const {
return DominatorIterator();
}
BasicBlock::DominatorIterator BasicBlock::pdom_end() {
return DominatorIterator();
}
bool operator==(const BasicBlock::DominatorIterator& lhs,
const BasicBlock::DominatorIterator& rhs) {
return lhs.current_ == rhs.current_;
}
bool operator!=(const BasicBlock::DominatorIterator& lhs,
const BasicBlock::DominatorIterator& rhs) {
return !(lhs == rhs);
}
const BasicBlock*& BasicBlock::DominatorIterator::operator*() {
return current_;
}
} // namespace val
} // namespace spvtools