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