mirror of
https://github.com/RPCSX/llvm.git
synced 2024-12-16 08:27:21 +00:00
2fbfdcffd3
class. The Method class is obsolete (renamed) and all references to it are being converted over to Function. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2144 91177308-0d34-0410-b5e6-96231b3b80d8
103 lines
3.8 KiB
C++
103 lines
3.8 KiB
C++
//===- IntervalPartition.cpp - Interval Partition module code ----*- C++ -*--=//
|
|
//
|
|
// This file contains the definition of the cfg::IntervalPartition class, which
|
|
// calculates and represent the interval partition of a function.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "llvm/Analysis/IntervalIterator.h"
|
|
#include "Support/STLExtras.h"
|
|
|
|
using namespace cfg;
|
|
using std::make_pair;
|
|
|
|
AnalysisID IntervalPartition::ID(AnalysisID::create<IntervalPartition>());
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// IntervalPartition Implementation
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
// destroy - Reset state back to before function was analyzed
|
|
void IntervalPartition::destroy() {
|
|
for_each(begin(), end(), deleter<cfg::Interval>);
|
|
IntervalMap.clear();
|
|
RootInterval = 0;
|
|
}
|
|
|
|
// 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) {
|
|
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(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 propogate successor info as
|
|
// predecessor info.
|
|
//
|
|
void IntervalPartition::updatePredecessors(cfg::Interval *Int) {
|
|
BasicBlock *Header = Int->getHeaderNode();
|
|
for (Interval::succ_iterator I = Int->Successors.begin(),
|
|
E = Int->Successors.end(); I != E; ++I)
|
|
getBlockInterval(*I)->Predecessors.push_back(Header);
|
|
}
|
|
|
|
// IntervalPartition ctor - Build the first level interval partition for the
|
|
// specified function...
|
|
//
|
|
bool IntervalPartition::runOnMethod(Function *M) {
|
|
assert(M->front() && "Cannot operate on prototypes!");
|
|
|
|
// Pass false to intervals_begin because we take ownership of it's memory
|
|
function_interval_iterator I = intervals_begin(M, false);
|
|
assert(I != intervals_end(M) && "No intervals in function!?!?!");
|
|
|
|
addIntervalToPartition(RootInterval = *I);
|
|
|
|
++I; // After the first one...
|
|
|
|
// Add the rest of the intervals to the partition...
|
|
for_each(I, intervals_end(M),
|
|
bind_obj(this, &IntervalPartition::addIntervalToPartition));
|
|
|
|
// Now that we know all of the successor information, propogate this to the
|
|
// predecessors for each block...
|
|
for_each(begin(), end(),
|
|
bind_obj(this, &IntervalPartition::updatePredecessors));
|
|
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) {
|
|
Interval *FunctionStart = IP.getRootInterval();
|
|
assert(FunctionStart && "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_each(I, intervals_end(IP),
|
|
bind_obj(this, &IntervalPartition::addIntervalToPartition));
|
|
|
|
// Now that we know all of the successor information, propogate this to the
|
|
// predecessors for each block...
|
|
for_each(begin(), end(),
|
|
bind_obj(this, &IntervalPartition::updatePredecessors));
|
|
}
|