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114 lines
4.3 KiB
C++
114 lines
4.3 KiB
C++
//===- IntervalPartition.cpp - Interval Partition module code -------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file contains the definition of the IntervalPartition class, which
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// calculates and represent the interval partition of a function.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Analysis/IntervalPartition.h"
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#include "llvm/Analysis/Interval.h"
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#include "llvm/Analysis/IntervalIterator.h"
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#include "llvm/Pass.h"
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#include <cassert>
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#include <utility>
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using namespace llvm;
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char IntervalPartition::ID = 0;
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INITIALIZE_PASS(IntervalPartition, "intervals",
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"Interval Partition Construction", true, true)
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//===----------------------------------------------------------------------===//
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// IntervalPartition Implementation
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//===----------------------------------------------------------------------===//
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// releaseMemory - Reset state back to before function was analyzed
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void IntervalPartition::releaseMemory() {
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for (unsigned i = 0, e = Intervals.size(); i != e; ++i)
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delete Intervals[i];
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IntervalMap.clear();
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Intervals.clear();
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RootInterval = nullptr;
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}
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void IntervalPartition::print(raw_ostream &O, const Module*) const {
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for(unsigned i = 0, e = Intervals.size(); i != e; ++i)
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Intervals[i]->print(O);
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}
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// addIntervalToPartition - Add an interval to the internal list of intervals,
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// and then add mappings from all of the basic blocks in the interval to the
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// interval itself (in the IntervalMap).
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void IntervalPartition::addIntervalToPartition(Interval *I) {
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Intervals.push_back(I);
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// Add mappings for all of the basic blocks in I to the IntervalPartition
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for (Interval::node_iterator It = I->Nodes.begin(), End = I->Nodes.end();
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It != End; ++It)
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IntervalMap.insert(std::make_pair(*It, I));
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}
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// updatePredecessors - Interval generation only sets the successor fields of
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// the interval data structures. After interval generation is complete,
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// run through all of the intervals and propagate successor info as
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// predecessor info.
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void IntervalPartition::updatePredecessors(Interval *Int) {
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BasicBlock *Header = Int->getHeaderNode();
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for (BasicBlock *Successor : Int->Successors)
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getBlockInterval(Successor)->Predecessors.push_back(Header);
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}
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// IntervalPartition ctor - Build the first level interval partition for the
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// specified function...
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bool IntervalPartition::runOnFunction(Function &F) {
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// Pass false to intervals_begin because we take ownership of it's memory
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function_interval_iterator I = intervals_begin(&F, false);
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assert(I != intervals_end(&F) && "No intervals in function!?!?!");
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addIntervalToPartition(RootInterval = *I);
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++I; // After the first one...
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// Add the rest of the intervals to the partition.
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for (function_interval_iterator E = intervals_end(&F); I != E; ++I)
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addIntervalToPartition(*I);
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// Now that we know all of the successor information, propagate this to the
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// predecessors for each block.
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for (unsigned i = 0, e = Intervals.size(); i != e; ++i)
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updatePredecessors(Intervals[i]);
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return false;
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}
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// IntervalPartition ctor - Build a reduced interval partition from an
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// existing interval graph. This takes an additional boolean parameter to
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// distinguish it from a copy constructor. Always pass in false for now.
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IntervalPartition::IntervalPartition(IntervalPartition &IP, bool)
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: FunctionPass(ID) {
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assert(IP.getRootInterval() && "Cannot operate on empty IntervalPartitions!");
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// Pass false to intervals_begin because we take ownership of it's memory
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interval_part_interval_iterator I = intervals_begin(IP, false);
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assert(I != intervals_end(IP) && "No intervals in interval partition!?!?!");
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addIntervalToPartition(RootInterval = *I);
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++I; // After the first one...
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// Add the rest of the intervals to the partition.
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for (interval_part_interval_iterator E = intervals_end(IP); I != E; ++I)
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addIntervalToPartition(*I);
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// Now that we know all of the successor information, propagate this to the
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// predecessors for each block.
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for (unsigned i = 0, e = Intervals.size(); i != e; ++i)
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updatePredecessors(Intervals[i]);
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}
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