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This list does not provide the ability to go backwards in the list (its more of an unordered collection, stored in the shape of a list). This change means that use iterators are now only forward iterators, not bidirectional. This improves the memory usage of use lists from '5 + 4*#use' per value to '1 + 4*#use'. While it would be better to reduce the multiplied factor, I'm not smart enough to do so. This list also has slightly more efficient operators for manipulating list nodes (a few less loads/stores), due to not needing to be able to iterate backwards through the list. This change reduces the memory footprint required to hold 176.gcc from 66.025M -> 57.687M, a 14% reduction. It also speeds up the compiler, 7.73% in the case of bytecode loading alone (release build loading 176.gcc). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19956 91177308-0d34-0410-b5e6-96231b3b80d8
267 lines
9.4 KiB
C++
267 lines
9.4 KiB
C++
//===-- llvm/Support/CFG.h - Process LLVM structures as graphs --*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines specializations of GraphTraits that allow Function and
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// BasicBlock graphs to be treated as proper graphs for generic algorithms.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_SUPPORT_CFG_H
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#define LLVM_SUPPORT_CFG_H
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#include "llvm/ADT/GraphTraits.h"
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#include "llvm/Function.h"
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#include "llvm/InstrTypes.h"
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#include "llvm/ADT/iterator"
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namespace llvm {
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//===--------------------------------------------------------------------===//
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// BasicBlock pred_iterator definition
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//===--------------------------------------------------------------------===//
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template <class _Ptr, class _USE_iterator> // Predecessor Iterator
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class PredIterator : public forward_iterator<_Ptr, ptrdiff_t> {
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typedef forward_iterator<_Ptr, ptrdiff_t> super;
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_Ptr *BB;
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_USE_iterator It;
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public:
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typedef PredIterator<_Ptr,_USE_iterator> _Self;
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typedef typename super::pointer pointer;
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inline void advancePastNonTerminators() {
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// Loop to ignore non terminator uses (for example PHI nodes)...
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while (It != BB->use_end() && !isa<TerminatorInst>(*It))
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++It;
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}
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inline PredIterator(_Ptr *bb) : BB(bb), It(bb->use_begin()) {
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advancePastNonTerminators();
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}
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inline PredIterator(_Ptr *bb, bool) : BB(bb), It(bb->use_end()) {}
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inline bool operator==(const _Self& x) const { return It == x.It; }
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inline bool operator!=(const _Self& x) const { return !operator==(x); }
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inline pointer operator*() const {
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assert(It != BB->use_end() && "pred_iterator out of range!");
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return cast<TerminatorInst>(*It)->getParent();
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}
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inline pointer *operator->() const { return &(operator*()); }
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inline _Self& operator++() { // Preincrement
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assert(It != BB->use_end() && "pred_iterator out of range!");
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++It; advancePastNonTerminators();
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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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};
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typedef PredIterator<BasicBlock, Value::use_iterator> pred_iterator;
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typedef PredIterator<const BasicBlock,
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Value::use_const_iterator> pred_const_iterator;
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inline pred_iterator pred_begin(BasicBlock *BB) { return pred_iterator(BB); }
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inline pred_const_iterator pred_begin(const BasicBlock *BB) {
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return pred_const_iterator(BB);
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}
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inline pred_iterator pred_end(BasicBlock *BB) { return pred_iterator(BB, true);}
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inline pred_const_iterator pred_end(const BasicBlock *BB) {
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return pred_const_iterator(BB, true);
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}
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//===--------------------------------------------------------------------===//
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// BasicBlock succ_iterator definition
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//===--------------------------------------------------------------------===//
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template <class Term_, class BB_> // Successor Iterator
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class SuccIterator : public bidirectional_iterator<BB_, ptrdiff_t> {
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const Term_ Term;
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unsigned idx;
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typedef bidirectional_iterator<BB_, ptrdiff_t> super;
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public:
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typedef SuccIterator<Term_, BB_> _Self;
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typedef typename super::pointer pointer;
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// TODO: This can be random access iterator, need operator+ and stuff tho
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inline SuccIterator(Term_ T) : Term(T), idx(0) { // begin iterator
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assert(T && "getTerminator returned null!");
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}
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inline SuccIterator(Term_ T, bool) // end iterator
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: Term(T), idx(Term->getNumSuccessors()) {
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assert(T && "getTerminator returned null!");
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}
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inline const _Self &operator=(const _Self &I) {
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assert(Term == I.Term &&"Cannot assign iterators to two different blocks!");
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idx = I.idx;
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return *this;
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}
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/// getSuccessorIndex - This is used to interface between code that wants to
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/// operate on terminator instructions directly.
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unsigned getSuccessorIndex() const { return idx; }
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inline bool operator==(const _Self& x) const { return idx == x.idx; }
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inline bool operator!=(const _Self& x) const { return !operator==(x); }
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inline pointer operator*() const { return Term->getSuccessor(idx); }
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inline pointer operator->() const { return operator*(); }
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inline _Self& operator++() { ++idx; return *this; } // Preincrement
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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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inline _Self& operator--() { --idx; return *this; } // Predecrement
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inline _Self operator--(int) { // Postdecrement
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_Self tmp = *this; --*this; return tmp;
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}
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};
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typedef SuccIterator<TerminatorInst*, BasicBlock> succ_iterator;
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typedef SuccIterator<const TerminatorInst*,
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const BasicBlock> succ_const_iterator;
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inline succ_iterator succ_begin(BasicBlock *BB) {
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return succ_iterator(BB->getTerminator());
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}
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inline succ_const_iterator succ_begin(const BasicBlock *BB) {
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return succ_const_iterator(BB->getTerminator());
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}
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inline succ_iterator succ_end(BasicBlock *BB) {
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return succ_iterator(BB->getTerminator(), true);
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}
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inline succ_const_iterator succ_end(const BasicBlock *BB) {
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return succ_const_iterator(BB->getTerminator(), true);
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}
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//===--------------------------------------------------------------------===//
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// GraphTraits specializations for basic block graphs (CFGs)
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//===--------------------------------------------------------------------===//
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// Provide specializations of GraphTraits to be able to treat a function as a
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// graph of basic blocks...
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template <> struct GraphTraits<BasicBlock*> {
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typedef BasicBlock NodeType;
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typedef succ_iterator ChildIteratorType;
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static NodeType *getEntryNode(BasicBlock *BB) { return BB; }
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static inline ChildIteratorType child_begin(NodeType *N) {
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return succ_begin(N);
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}
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static inline ChildIteratorType child_end(NodeType *N) {
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return succ_end(N);
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}
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};
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template <> struct GraphTraits<const BasicBlock*> {
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typedef const BasicBlock NodeType;
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typedef succ_const_iterator ChildIteratorType;
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static NodeType *getEntryNode(const BasicBlock *BB) { return BB; }
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static inline ChildIteratorType child_begin(NodeType *N) {
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return succ_begin(N);
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}
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static inline ChildIteratorType child_end(NodeType *N) {
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return succ_end(N);
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}
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};
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// Provide specializations of GraphTraits to be able to treat a function as a
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// graph of basic blocks... and to walk it in inverse order. Inverse order for
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// a function is considered to be when traversing the predecessor edges of a BB
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// instead of the successor edges.
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//
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template <> struct GraphTraits<Inverse<BasicBlock*> > {
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typedef BasicBlock NodeType;
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typedef pred_iterator ChildIteratorType;
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static NodeType *getEntryNode(Inverse<BasicBlock *> G) { return G.Graph; }
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static inline ChildIteratorType child_begin(NodeType *N) {
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return pred_begin(N);
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}
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static inline ChildIteratorType child_end(NodeType *N) {
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return pred_end(N);
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}
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};
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template <> struct GraphTraits<Inverse<const BasicBlock*> > {
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typedef const BasicBlock NodeType;
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typedef pred_const_iterator ChildIteratorType;
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static NodeType *getEntryNode(Inverse<const BasicBlock*> G) {
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return G.Graph;
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}
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static inline ChildIteratorType child_begin(NodeType *N) {
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return pred_begin(N);
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}
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static inline ChildIteratorType child_end(NodeType *N) {
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return pred_end(N);
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}
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};
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//===--------------------------------------------------------------------===//
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// GraphTraits specializations for function basic block graphs (CFGs)
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//===--------------------------------------------------------------------===//
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// Provide specializations of GraphTraits to be able to treat a function as a
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// graph of basic blocks... these are the same as the basic block iterators,
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// except that the root node is implicitly the first node of the function.
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//
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template <> struct GraphTraits<Function*> : public GraphTraits<BasicBlock*> {
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static NodeType *getEntryNode(Function *F) { return &F->getEntryBlock(); }
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// nodes_iterator/begin/end - Allow iteration over all nodes in the graph
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typedef Function::iterator nodes_iterator;
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static nodes_iterator nodes_begin(Function *F) { return F->begin(); }
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static nodes_iterator nodes_end (Function *F) { return F->end(); }
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};
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template <> struct GraphTraits<const Function*> :
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public GraphTraits<const BasicBlock*> {
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static NodeType *getEntryNode(const Function *F) {return &F->getEntryBlock();}
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// nodes_iterator/begin/end - Allow iteration over all nodes in the graph
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typedef Function::const_iterator nodes_iterator;
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static nodes_iterator nodes_begin(const Function *F) { return F->begin(); }
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static nodes_iterator nodes_end (const Function *F) { return F->end(); }
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};
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// Provide specializations of GraphTraits to be able to treat a function as a
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// graph of basic blocks... and to walk it in inverse order. Inverse order for
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// a function is considered to be when traversing the predecessor edges of a BB
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// instead of the successor edges.
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//
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template <> struct GraphTraits<Inverse<Function*> > :
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public GraphTraits<Inverse<BasicBlock*> > {
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static NodeType *getEntryNode(Inverse<Function*> G) {
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return &G.Graph->getEntryBlock();
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}
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};
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template <> struct GraphTraits<Inverse<const Function*> > :
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public GraphTraits<Inverse<const BasicBlock*> > {
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static NodeType *getEntryNode(Inverse<const Function *> G) {
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return &G.Graph->getEntryBlock();
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}
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};
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} // End llvm namespace
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#endif
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