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IntervalPartition & IntervalIterator classes have been split out into
their own .h files llvm-svn: 61
This commit is contained in:
Chris Lattner
parent
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commit
4316c524b4
@ -1,36 +1,24 @@
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//===- llvm/Analysis/Intervals.h - Interval partition Calculation-*- C++ -*--=//
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//===- llvm/Analysis/Interval.h - Interval Class Declaration -----*- 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 represents the interval partition of a method, or a
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// preexisting interval partition.
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//
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// In this way, the interval partition may be used to reduce a flow graph down
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// to its degenerate single node interval partition (unless it is irreducible).
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//
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// TODO: The IntervalPartition class should take a bool parameter that tells
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// whether it should add the "tails" of an interval to an interval itself or if
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// they should be represented as distinct intervals.
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// This file contains the declaration of the cfg::Interval class, which
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// represents a set of CFG nodes and is a portion of an interval partition.
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//
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// Intervals have some interesting and useful properties, including the
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// following:
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// 1. The header node of an interval dominates all of the elements of the
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// interval
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_INTERVALS_H
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#define LLVM_INTERVALS_H
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#ifndef LLVM_INTERVAL_H
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#define LLVM_INTERVAL_H
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#include "llvm/Method.h"
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#include "llvm/CFG.h"
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#include <vector>
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#include <map>
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#include <stack>
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#include <set>
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#include <algorithm>
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class Method;
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class BasicBlock;
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namespace cfg {
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class IntervalPartition;
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//===----------------------------------------------------------------------===//
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//
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// Interval Class - An Interval is a set of nodes defined such that every node
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@ -38,8 +26,6 @@ class IntervalPartition;
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// header)
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//
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class Interval {
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friend class IntervalPartition;
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// HeaderNode - The header BasicBlock, which dominates all BasicBlocks in this
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// interval. Also, any loops in this interval must go through the HeaderNode.
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//
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@ -49,6 +35,10 @@ public:
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typedef vector<BasicBlock*>::iterator pred_iterator;
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typedef vector<BasicBlock*>::iterator node_iterator;
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inline Interval(BasicBlock *Header) : HeaderNode(Header) {
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Nodes.push_back(Header);
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}
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inline BasicBlock *getHeaderNode() const { return HeaderNode; }
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// Nodes - The basic blocks in this interval.
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@ -68,21 +58,24 @@ public:
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// contains - Find out if a basic block is in this interval
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inline bool contains(BasicBlock *BB) const {
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return find(Nodes.begin(), Nodes.end(), BB) != Nodes.end();
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for (unsigned i = 0; i < Nodes.size(); ++i)
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if (Nodes[i] == BB) return true;
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return false;
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// I don't want the dependency on <algorithm>
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//return find(Nodes.begin(), Nodes.end(), BB) != Nodes.end();
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}
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// isSuccessor - find out if a basic block is a successor of this Interval
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inline bool isSuccessor(BasicBlock *BB) const {
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return find(Successors.begin(), Successors.end(), BB) != Successors.end();
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for (unsigned i = 0; i < Successors.size(); ++i)
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if (Successors[i] == BB) return true;
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return false;
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// I don't want the dependency on <algorithm>
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//return find(Successors.begin(), Successors.end(), BB) != Successors.end();
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}
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// isLoop - Find out if there is a back edge in this interval...
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bool isLoop() const;
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//private: // Only accessable by IntervalPartition class
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inline Interval(BasicBlock *Header) : HeaderNode(Header) {
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Nodes.push_back(Header);
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}
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};
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@ -106,291 +99,6 @@ inline Interval::pred_iterator pred_end(Interval *I) {
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return I->Predecessors.end();
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}
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//===----------------------------------------------------------------------===//
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// IntervalIterator
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//
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// TODO: Provide an interval iterator that codifies the internals of
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// IntervalPartition. Inside, it would have a stack of Interval*'s, and would
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// walk the interval partition in depth first order. IntervalPartition would
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// then be a client of this iterator. The iterator should work on Method*,
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// const Method*, IntervalPartition*, and const IntervalPartition*.
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//
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template<class NodeTy, class OrigContainer_t>
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class IntervalIterator {
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stack<pair<Interval, typename Interval::succ_iterator> > IntStack;
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set<BasicBlock*> Visited;
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OrigContainer_t *OrigContainer;
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public:
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typedef BasicBlock* _BB;
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typedef IntervalIterator<NodeTy, OrigContainer_t> _Self;
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typedef forward_iterator_tag iterator_category;
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IntervalIterator() {} // End iterator, empty stack
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IntervalIterator(Method *M) {
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OrigContainer = M;
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if (!ProcessInterval(M->getBasicBlocks().front())) {
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assert(0 && "ProcessInterval should never fail for first interval!");
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}
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}
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inline bool operator==(const _Self& x) const { return IntStack == x.IntStack; }
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inline bool operator!=(const _Self& x) const { return !operator==(x); }
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inline Interval &operator*() const { return IntStack.top(); }
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inline Interval *operator->() const { return &(operator*()); }
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inline _Self& operator++() { // Preincrement
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do {
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// All of the intervals on the stack have been visited. Try visiting their
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// successors now.
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Interval &CurInt = IntStack.top().first;
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Interval::iterator &SuccIt = IntStack.top().second,End = succ_end(&CurInt);
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for (; SuccIt != End; ++SuccIt) // Loop over all interval successors
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if (ProcessInterval(*SuccIt)) // Found a new interval!
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return *this; // Use it!
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// We ran out of successors for this interval... pop off the stack
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IntStack.pop();
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} while (!IntStack.empty());
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return *this;
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}
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inline _Self operator++(int) { // Postincrement
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_Self tmp = *this; ++*this; return tmp;
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}
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private:
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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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bool ProcessInterval(NodeTy *Node) {
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BasicBlock *Header = getNodeHeader(Node);
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if (Visited.count(Header)) return false;
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Interval Int(Header);
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Visited.insert(Header); // The header has now been visited!
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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(OrigContainer, *I));
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IntStack.push(make_pair(Int, succ_begin(&Int)));
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return true;
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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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void ProcessNode(Interval *Int, NodeTy *Node) {
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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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if (Visited.count(NodeHeader)) { // Node already been visited?
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if (Int->contains(NodeHeader)) { // Already in this interval...
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return;
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} else { // 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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}
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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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Visited.insert(NodeHeader); // The node has now been visited!
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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
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// of 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(OrigContainer, *It));
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}
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}
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};
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//===----------------------------------------------------------------------===//
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//
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// IntervalPartition - This class builds and holds an "interval partition" for
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// a method. This partition divides the control flow graph into a set of
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// maximal intervals, as defined with the properties above. Intuitively, a
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// BasicBlock is a (possibly nonexistent) loop with a "tail" of non looping
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// nodes following it.
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//
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class IntervalPartition {
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typedef map<BasicBlock*, Interval*> IntervalMapTy;
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IntervalMapTy IntervalMap;
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typedef vector<Interval*> IntervalListTy;
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IntervalListTy IntervalList;
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Interval *RootInterval;
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public:
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typedef IntervalListTy::iterator iterator;
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public:
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// IntervalPartition ctor - Build the partition for the specified method
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IntervalPartition(Method *M);
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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 &I, bool);
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// Destructor - Free memory
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~IntervalPartition();
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// getRootInterval() - Return the root interval that contains the starting
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// block of the method.
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inline Interval *getRootInterval() { return RootInterval; }
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// isDegeneratePartition() - Returns true if the interval partition contains
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// a single interval, and thus cannot be simplified anymore.
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bool isDegeneratePartition() { return size() == 1; }
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// TODO: isIrreducible - look for triangle graph.
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// getBlockInterval - Return the interval that a basic block exists in.
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inline Interval *getBlockInterval(BasicBlock *BB) {
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IntervalMapTy::iterator I = IntervalMap.find(BB);
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return I != IntervalMap.end() ? I->second : 0;
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}
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// Iterators to iterate over all of the intervals in the method
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inline iterator begin() { return IntervalList.begin(); }
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inline iterator end() { return IntervalList.end(); }
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inline unsigned size() { return IntervalList.size(); }
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private:
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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 ProcessInterval(NodeTy *Node, OrigContainer *OC);
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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 ProcessNode(Interval *Int, NodeTy *Node, OrigContainer *OC);
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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 addNodeToInterval(Interval *Int, Interval *I);
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inline void addNodeToInterval(Interval *Int, BasicBlock *BB);
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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 updatePredecessors(Interval *Int);
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};
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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 BasicBlock *getNodeHeader(BasicBlock *BB) { return BB; }
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inline 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 BasicBlock *getSourceGraphNode(Method *, BasicBlock *BB) {
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return BB;
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}
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inline Interval *getSourceGraphNode(IntervalPartition *IP, BasicBlock *BB) {
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return IP->getBlockInterval(BB);
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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.
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//
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inline void addNodeToInterval(Interval *Int, BasicBlock *BB){
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Int->Nodes.push_back(BB);
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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 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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}
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typedef IntervalIterator<BasicBlock, Method> method_interval_iterator;
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method_interval_iterator intervals_begin(Method *M) {
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return method_interval_iterator(M);
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}
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method_interval_iterator intervals_end(Method *M) {
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return method_interval_iterator();
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}
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} // End namespace cfg
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#endif
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