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IntervalPartition & IntervalIterator classes have been split out into
their own .h files & .cpp file llvm-svn: 62
This commit is contained in:
Chris Lattner
parent
4316c524b4
commit
0888156ce8
@ -1,12 +1,11 @@
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//===- Intervals.cpp - Interval partition Calculation ------------*- C++ -*--=//
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//===- Interval.cpp - Interval class code ------------------------*- C++ -*--=//
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//
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// This file contains the declaration of the cfg::IntervalPartition class, which
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// calculates and represent the interval partition of a method.
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// This file contains the definition of the cfg::Interval class, which
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// represents a partition of a control flow graph of some kind.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Analysis/Intervals.h"
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#include "llvm/Method.h"
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#include "llvm/Analysis/Interval.h"
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#include "llvm/BasicBlock.h"
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#include "llvm/CFG.h"
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@ -29,195 +28,3 @@ bool Interval::isLoop() const {
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}
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//===----------------------------------------------------------------------===//
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// IntervalPartition Implementation
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//===----------------------------------------------------------------------===//
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template <class T> static inline void deleter(T *Ptr) { delete Ptr; }
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// Destructor - Free memory
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IntervalPartition::~IntervalPartition() {
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for_each(begin(), end(), deleter<cfg::Interval>);
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}
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#if 0
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// getNodeHeader - Given a source graph node and the source graph, return the
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// BasicBlock that is the header node. This is the opposite of
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// getSourceGraphNode.
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//
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inline static BasicBlock *getNodeHeader(BasicBlock *BB) { return BB; }
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inline static BasicBlock *getNodeHeader(Interval *I) { return I->getHeaderNode(); }
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// getSourceGraphNode - Given a BasicBlock and the source graph, return the
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// source graph node that corresponds to the BasicBlock. This is the opposite
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// of getNodeHeader.
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//
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inline static BasicBlock *getSourceGraphNode(Method *, BasicBlock *BB) {
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return BB;
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}
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inline static Interval *getSourceGraphNode(IntervalPartition *IP,
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BasicBlock *BB) {
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return IP->getBlockInterval(BB);
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}
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#endif
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// addNodeToInterval - This method exists to assist the generic ProcessNode
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// with the task of adding a node to the new interval, depending on the
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// type of the source node. In the case of a CFG source graph (BasicBlock
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// case), the BasicBlock itself is added to the interval.
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//
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inline void IntervalPartition::addNodeToInterval(Interval *Int, BasicBlock *BB){
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Int->Nodes.push_back(BB);
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IntervalMap.insert(make_pair(BB, Int));
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}
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// addNodeToInterval - This method exists to assist the generic ProcessNode
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// with the task of adding a node to the new interval, depending on the
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// type of the source node. In the case of a CFG source graph (BasicBlock
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// case), the BasicBlock itself is added to the interval. In the case of
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// an IntervalPartition source graph (Interval case), all of the member
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// BasicBlocks are added to the interval.
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//
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inline void IntervalPartition::addNodeToInterval(Interval *Int, Interval *I) {
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// Add all of the nodes in I as new nodes in Int.
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copy(I->Nodes.begin(), I->Nodes.end(), back_inserter(Int->Nodes));
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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(make_pair(*It, Int));
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}
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// ProcessNode - This method is called by ProcessInterval to add nodes to the
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// interval being constructed, and it is also called recursively as it walks
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// the source graph. A node is added to the current interval only if all of
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// its predecessors are already in the graph. This also takes care of keeping
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// the successor set of an interval up to date.
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//
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// This method is templated because it may operate on two different source
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// graphs: a basic block graph, or a preexisting interval graph.
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//
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template<class NodeTy, class OrigContainer>
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void IntervalPartition::ProcessNode(Interval *Int,
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NodeTy *Node, OrigContainer *OC) {
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assert(Int && "Null interval == bad!");
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assert(Node && "Null Node == bad!");
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BasicBlock *NodeHeader = getNodeHeader(Node);
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Interval *CurInt = getBlockInterval(NodeHeader);
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if (CurInt == Int) { // Already in this interval...
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return;
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} else if (CurInt != 0) { // In another interval, add as successor
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if (!Int->isSuccessor(NodeHeader)) // Add only if not already in set
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Int->Successors.push_back(NodeHeader);
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} else { // Otherwise, not in interval yet
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for (typename NodeTy::pred_iterator I = pred_begin(Node),
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E = pred_end(Node); I != E; ++I) {
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if (!Int->contains(*I)) { // If pred not in interval, we can't be
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if (!Int->isSuccessor(NodeHeader)) // Add only if not already in set
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Int->Successors.push_back(NodeHeader);
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return; // See you later
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}
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}
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// If we get here, then all of the predecessors of BB are in the interval
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// already. In this case, we must add BB to the interval!
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addNodeToInterval(Int, Node);
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if (Int->isSuccessor(NodeHeader)) {
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// If we were in the successor list from before... remove from succ list
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Int->Successors.erase(remove(Int->Successors.begin(),
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Int->Successors.end(), NodeHeader),
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Int->Successors.end());
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}
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// Now that we have discovered that Node is in the interval, perhaps some of
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// its successors are as well?
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for (typename NodeTy::succ_iterator It = succ_begin(Node),
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End = succ_end(Node); It != End; ++It)
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ProcessNode(Int, getSourceGraphNode(OC, *It), OC);
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}
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}
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// ProcessInterval - This method is used during the construction of the
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// interval graph. It walks through the source graph, recursively creating
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// an interval per invokation until the entire graph is covered. This uses
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// the ProcessNode method to add all of the nodes to the interval.
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//
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// This method is templated because it may operate on two different source
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// graphs: a basic block graph, or a preexisting interval graph.
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//
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template<class NodeTy, class OrigContainer>
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void IntervalPartition::ProcessInterval(NodeTy *Node, OrigContainer *OC) {
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BasicBlock *Header = getNodeHeader(Node);
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if (getBlockInterval(Header)) return; // Interval already constructed?
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// Create a new interval and add the interval to our current set
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Interval *Int = new Interval(Header);
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IntervalList.push_back(Int);
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IntervalMap.insert(make_pair(Header, Int));
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// Check all of our successors to see if they are in the interval...
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for (typename NodeTy::succ_iterator I = succ_begin(Node), E = succ_end(Node);
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I != E; ++I)
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ProcessNode(Int, getSourceGraphNode(OC, *I), OC);
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// Build all of the successor intervals of this interval now...
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for(Interval::succ_iterator I = Int->Successors.begin(),
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E = Int->Successors.end(); I != E; ++I) {
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ProcessInterval(getSourceGraphNode(OC, *I), OC);
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}
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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 propogate successor info as
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// predecessor info.
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//
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void IntervalPartition::updatePredecessors(cfg::Interval *Int) {
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BasicBlock *Header = Int->HeaderNode;
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for (Interval::succ_iterator I = Int->Successors.begin(),
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E = Int->Successors.end(); I != E; ++I)
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getBlockInterval(*I)->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 method...
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//
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IntervalPartition::IntervalPartition(Method *M) {
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BasicBlock *MethodStart = M->getBasicBlocks().front();
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assert(MethodStart && "Cannot operate on prototypes!");
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ProcessInterval(MethodStart, M);
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RootInterval = getBlockInterval(MethodStart);
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// Now that we know all of the successor information, propogate this to the
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// predecessors for each block...
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for(iterator I = begin(), E = end(); I != E; ++I)
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updatePredecessors(*I);
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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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//
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IntervalPartition::IntervalPartition(IntervalPartition &I, bool) {
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Interval *MethodStart = I.getRootInterval();
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assert(MethodStart && "Cannot operate on empty IntervalPartitions!");
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ProcessInterval(MethodStart, &I);
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RootInterval = getBlockInterval(*MethodStart->Nodes.begin());
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// Now that we know all of the successor information, propogate this to the
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// predecessors for each block...
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for(iterator I = begin(), E = end(); I != E; ++I)
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updatePredecessors(*I);
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}
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