mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-10-31 09:11:13 +00:00
bd8364aed7
* Add a nodeVisited method to the DF interator git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@362 91177308-0d34-0410-b5e6-96231b3b80d8
457 lines
14 KiB
C++
457 lines
14 KiB
C++
//===-- llvm/CFG.h - CFG definitions and useful classes ----------*- C++ -*--=//
|
|
//
|
|
// This file contains the class definitions useful for operating on the control
|
|
// flow graph.
|
|
//
|
|
// Currently it contains functionality for these three applications:
|
|
//
|
|
// 1. Iterate over the predecessors of a basic block:
|
|
// pred_iterator, pred_const_iterator, pred_begin, pred_end
|
|
// 2. Iterate over the successors of a basic block:
|
|
// succ_iterator, succ_const_iterator, succ_begin, succ_end
|
|
// 3. Iterate over the basic blocks of a method in depth first ordering or
|
|
// reverse depth first order. df_iterator, df_const_iterator,
|
|
// df_begin, df_end. df_begin takes an arg to specify reverse or not.
|
|
// 4. Iterator over the basic blocks of a method in post order.
|
|
// 5. Iterator over a method in reverse post order.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef LLVM_CFG_H
|
|
#define LLVM_CFG_H
|
|
|
|
#include "llvm/CFGdecls.h" // See this file for concise interface info
|
|
#include <set>
|
|
#include <stack>
|
|
#include <iterator>
|
|
#include "llvm/Method.h"
|
|
#include "llvm/BasicBlock.h"
|
|
#include "llvm/InstrTypes.h"
|
|
|
|
namespace cfg {
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// Implementation
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// Basic Block Predecessor Iterator
|
|
//
|
|
|
|
template <class _Ptr, class _USE_iterator> // Predecessor Iterator
|
|
class PredIterator : public std::bidirectional_iterator<_Ptr, ptrdiff_t> {
|
|
_Ptr *BB;
|
|
_USE_iterator It;
|
|
public:
|
|
typedef PredIterator<_Ptr,_USE_iterator> _Self;
|
|
|
|
inline void advancePastConstPool() {
|
|
// TODO: This is bad
|
|
// Loop to ignore constant pool references
|
|
while (It != BB->use_end() &&
|
|
((!(*It)->isInstruction()) ||
|
|
!(((Instruction*)(*It))->isTerminator())))
|
|
++It;
|
|
}
|
|
|
|
inline PredIterator(_Ptr *bb) : BB(bb), It(bb->use_begin()) {
|
|
advancePastConstPool();
|
|
}
|
|
inline PredIterator(_Ptr *bb, bool) : BB(bb), It(bb->use_end()) {}
|
|
|
|
inline bool operator==(const _Self& x) const { return It == x.It; }
|
|
inline bool operator!=(const _Self& x) const { return !operator==(x); }
|
|
|
|
inline pointer operator*() const {
|
|
return (*It)->castInstructionAsserting()->getParent();
|
|
}
|
|
inline pointer *operator->() const { return &(operator*()); }
|
|
|
|
inline _Self& operator++() { // Preincrement
|
|
++It; advancePastConstPool();
|
|
return *this;
|
|
}
|
|
|
|
inline _Self operator++(int) { // Postincrement
|
|
_Self tmp = *this; ++*this; return tmp;
|
|
}
|
|
|
|
inline _Self& operator--() { --It; return *this; } // Predecrement
|
|
inline _Self operator--(int) { // Postdecrement
|
|
_Self tmp = *this; --*this; return tmp;
|
|
}
|
|
};
|
|
|
|
inline pred_iterator pred_begin( BasicBlock *BB) {
|
|
return pred_iterator(BB);
|
|
}
|
|
inline pred_const_iterator pred_begin(const BasicBlock *BB) {
|
|
return pred_const_iterator(BB);
|
|
}
|
|
inline pred_iterator pred_end( BasicBlock *BB) {
|
|
return pred_iterator(BB,true);
|
|
}
|
|
inline pred_const_iterator pred_end(const BasicBlock *BB) {
|
|
return pred_const_iterator(BB,true);
|
|
}
|
|
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// Basic Block Successor Iterator
|
|
//
|
|
|
|
template <class _Term, class _BB> // Successor Iterator
|
|
class SuccIterator : public std::bidirectional_iterator<_BB, ptrdiff_t> {
|
|
const _Term Term;
|
|
unsigned idx;
|
|
public:
|
|
typedef SuccIterator<_Term, _BB> _Self;
|
|
// TODO: This can be random access iterator, need operator+ and stuff tho
|
|
|
|
inline SuccIterator(_Term T) : Term(T), idx(0) { // begin iterator
|
|
assert(T && "getTerminator returned null!");
|
|
}
|
|
inline SuccIterator(_Term T, bool) // end iterator
|
|
: Term(T), idx(Term->getNumSuccessors()) {
|
|
assert(T && "getTerminator returned null!");
|
|
}
|
|
|
|
inline bool operator==(const _Self& x) const { return idx == x.idx; }
|
|
inline bool operator!=(const _Self& x) const { return !operator==(x); }
|
|
|
|
inline pointer operator*() const { return Term->getSuccessor(idx); }
|
|
inline pointer operator->() const { return operator*(); }
|
|
|
|
inline _Self& operator++() { ++idx; return *this; } // Preincrement
|
|
inline _Self operator++(int) { // Postincrement
|
|
_Self tmp = *this; ++*this; return tmp;
|
|
}
|
|
|
|
inline _Self& operator--() { --idx; return *this; } // Predecrement
|
|
inline _Self operator--(int) { // Postdecrement
|
|
_Self tmp = *this; --*this; return tmp;
|
|
}
|
|
};
|
|
|
|
inline succ_iterator succ_begin( BasicBlock *BB) {
|
|
return succ_iterator(BB->getTerminator());
|
|
}
|
|
inline succ_const_iterator succ_begin(const BasicBlock *BB) {
|
|
return succ_const_iterator(BB->getTerminator());
|
|
}
|
|
inline succ_iterator succ_end( BasicBlock *BB) {
|
|
return succ_iterator(BB->getTerminator(),true);
|
|
}
|
|
inline succ_const_iterator succ_end(const BasicBlock *BB) {
|
|
return succ_const_iterator(BB->getTerminator(),true);
|
|
}
|
|
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// Graph Type Declarations
|
|
//
|
|
// BasicBlockGraph - Represent a standard traversal of a CFG
|
|
// ConstBasicBlockGraph - Represent a standard traversal of a const CFG
|
|
// InverseBasicBlockGraph - Represent a inverse traversal of a CFG
|
|
// ConstInverseBasicBlockGraph - Represent a inverse traversal of a const CFG
|
|
//
|
|
// An Inverse traversal of a graph is where we chase predecessors, instead of
|
|
// successors.
|
|
//
|
|
struct BasicBlockGraph {
|
|
typedef BasicBlock NodeType;
|
|
typedef succ_iterator ChildIteratorType;
|
|
static inline ChildIteratorType child_begin(NodeType *N) {
|
|
return succ_begin(N);
|
|
}
|
|
static inline ChildIteratorType child_end(NodeType *N) {
|
|
return succ_end(N);
|
|
}
|
|
};
|
|
|
|
struct ConstBasicBlockGraph {
|
|
typedef const BasicBlock NodeType;
|
|
typedef succ_const_iterator ChildIteratorType;
|
|
static inline ChildIteratorType child_begin(NodeType *N) {
|
|
return succ_begin(N);
|
|
}
|
|
static inline ChildIteratorType child_end(NodeType *N) {
|
|
return succ_end(N);
|
|
}
|
|
};
|
|
|
|
struct InverseBasicBlockGraph {
|
|
typedef BasicBlock NodeType;
|
|
typedef pred_iterator ChildIteratorType;
|
|
static inline ChildIteratorType child_begin(NodeType *N) {
|
|
return pred_begin(N);
|
|
}
|
|
static inline ChildIteratorType child_end(NodeType *N) {
|
|
return pred_end(N);
|
|
}
|
|
};
|
|
|
|
struct ConstInverseBasicBlockGraph {
|
|
typedef const BasicBlock NodeType;
|
|
typedef pred_const_iterator ChildIteratorType;
|
|
static inline ChildIteratorType child_begin(NodeType *N) {
|
|
return pred_begin(N);
|
|
}
|
|
static inline ChildIteratorType child_end(NodeType *N) {
|
|
return pred_end(N);
|
|
}
|
|
};
|
|
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// Depth First Iterator
|
|
//
|
|
|
|
// Generic Depth First Iterator
|
|
template<class GI>
|
|
class DFIterator : public std::forward_iterator<typename GI::NodeType,
|
|
ptrdiff_t> {
|
|
typedef typename GI::NodeType NodeType;
|
|
typedef typename GI::ChildIteratorType ChildItTy;
|
|
|
|
set<NodeType *> Visited; // All of the blocks visited so far...
|
|
// VisitStack - Used to maintain the ordering. Top = current block
|
|
// First element is node pointer, second is the 'next child' to visit
|
|
stack<pair<NodeType *, ChildItTy> > VisitStack;
|
|
const bool Reverse; // Iterate over children before self?
|
|
private:
|
|
void reverseEnterNode() {
|
|
pair<NodeType *, ChildItTy> &Top = VisitStack.top();
|
|
NodeType *Node = Top.first;
|
|
ChildItTy &It = Top.second;
|
|
for (; It != GI::child_end(Node); ++It) {
|
|
NodeType *Child = *It;
|
|
if (!Visited.count(Child)) {
|
|
Visited.insert(Child);
|
|
VisitStack.push(make_pair(Child, GI::child_begin(Child)));
|
|
reverseEnterNode();
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
public:
|
|
typedef DFIterator<GI> _Self;
|
|
|
|
inline DFIterator(NodeType *Node, bool reverse) : Reverse(reverse) {
|
|
Visited.insert(Node);
|
|
VisitStack.push(make_pair(Node, GI::child_begin(Node)));
|
|
if (Reverse) reverseEnterNode();
|
|
}
|
|
inline DFIterator() { /* End is when stack is empty */ }
|
|
|
|
inline bool operator==(const _Self& x) const {
|
|
return VisitStack == x.VisitStack;
|
|
}
|
|
inline bool operator!=(const _Self& x) const { return !operator==(x); }
|
|
|
|
inline pointer operator*() const {
|
|
return VisitStack.top().first;
|
|
}
|
|
|
|
// This is a nonstandard operator-> that dereferences the pointer an extra
|
|
// time... so that you can actually call methods ON the Node, because
|
|
// the contained type is a pointer. This allows BBIt->getTerminator() f.e.
|
|
//
|
|
inline NodeType *operator->() const { return operator*(); }
|
|
|
|
inline _Self& operator++() { // Preincrement
|
|
if (Reverse) { // Reverse Depth First Iterator
|
|
if (VisitStack.top().second == GI::child_end(VisitStack.top().first))
|
|
VisitStack.pop();
|
|
if (!VisitStack.empty())
|
|
reverseEnterNode();
|
|
} else { // Normal Depth First Iterator
|
|
do {
|
|
pair<NodeType *, ChildItTy> &Top = VisitStack.top();
|
|
NodeType *Node = Top.first;
|
|
ChildItTy &It = Top.second;
|
|
|
|
while (It != GI::child_end(Node)) {
|
|
NodeType *Next = *It++;
|
|
if (!Visited.count(Next)) { // Has our next sibling been visited?
|
|
// No, do it now.
|
|
Visited.insert(Next);
|
|
VisitStack.push(make_pair(Next, GI::child_begin(Next)));
|
|
return *this;
|
|
}
|
|
}
|
|
|
|
// Oops, ran out of successors... go up a level on the stack.
|
|
VisitStack.pop();
|
|
} while (!VisitStack.empty());
|
|
}
|
|
return *this;
|
|
}
|
|
|
|
inline _Self operator++(int) { // Postincrement
|
|
_Self tmp = *this; ++*this; return tmp;
|
|
}
|
|
|
|
// nodeVisited - return true if this iterator has already visited the
|
|
// specified node. This is public, and will probably be used to iterate over
|
|
// nodes that a depth first iteration did not find: ie unreachable nodes.
|
|
//
|
|
inline bool nodeVisited(NodeType *Node) const {
|
|
return Visited.count(Node) != 0;
|
|
}
|
|
};
|
|
|
|
inline df_iterator df_begin(Method *M, bool Reverse = false) {
|
|
return df_iterator(M->front(), Reverse);
|
|
}
|
|
|
|
inline df_const_iterator df_begin(const Method *M, bool Reverse = false) {
|
|
return df_const_iterator(M->front(), Reverse);
|
|
}
|
|
inline df_iterator df_end(Method*) {
|
|
return df_iterator();
|
|
}
|
|
inline df_const_iterator df_end(const Method*) {
|
|
return df_const_iterator();
|
|
}
|
|
|
|
inline df_iterator df_begin(BasicBlock *BB, bool Reverse = false) {
|
|
return df_iterator(BB, Reverse);
|
|
}
|
|
inline df_const_iterator df_begin(const BasicBlock *BB, bool Reverse = false) {
|
|
return df_const_iterator(BB, Reverse);
|
|
}
|
|
|
|
inline df_iterator df_end(BasicBlock*) {
|
|
return df_iterator();
|
|
}
|
|
inline df_const_iterator df_end(const BasicBlock*) {
|
|
return df_const_iterator();
|
|
}
|
|
|
|
|
|
|
|
inline idf_iterator idf_begin(BasicBlock *BB, bool Reverse = false) {
|
|
return idf_iterator(BB, Reverse);
|
|
}
|
|
inline idf_const_iterator idf_begin(const BasicBlock *BB, bool Reverse = false) {
|
|
return idf_const_iterator(BB, Reverse);
|
|
}
|
|
|
|
inline idf_iterator idf_end(BasicBlock*) {
|
|
return idf_iterator();
|
|
}
|
|
inline idf_const_iterator idf_end(const BasicBlock*) {
|
|
return idf_const_iterator();
|
|
}
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// Post Order CFG iterator code
|
|
//
|
|
|
|
template<class BBType, class SuccItTy>
|
|
class POIterator : public std::forward_iterator<BBType, ptrdiff_t> {
|
|
set<BBType *> Visited; // All of the blocks visited so far...
|
|
// VisitStack - Used to maintain the ordering. Top = current block
|
|
// First element is basic block pointer, second is the 'next child' to visit
|
|
stack<pair<BBType *, SuccItTy> > VisitStack;
|
|
|
|
void traverseChild() {
|
|
while (VisitStack.top().second != succ_end(VisitStack.top().first)) {
|
|
BBType *BB = *VisitStack.top().second++;
|
|
if (!Visited.count(BB)) { // If the block is not visited...
|
|
Visited.insert(BB);
|
|
VisitStack.push(make_pair(BB, succ_begin(BB)));
|
|
}
|
|
}
|
|
}
|
|
public:
|
|
typedef POIterator<BBType, SuccItTy> _Self;
|
|
|
|
inline POIterator(BBType *BB) {
|
|
Visited.insert(BB);
|
|
VisitStack.push(make_pair(BB, succ_begin(BB)));
|
|
traverseChild();
|
|
}
|
|
inline POIterator() { /* End is when stack is empty */ }
|
|
|
|
inline bool operator==(const _Self& x) const {
|
|
return VisitStack == x.VisitStack;
|
|
}
|
|
inline bool operator!=(const _Self& x) const { return !operator==(x); }
|
|
|
|
inline pointer operator*() const {
|
|
return VisitStack.top().first;
|
|
}
|
|
|
|
// This is a nonstandard operator-> that dereferences the pointer an extra
|
|
// time... so that you can actually call methods ON the BasicBlock, because
|
|
// the contained type is a pointer. This allows BBIt->getTerminator() f.e.
|
|
//
|
|
inline BBType *operator->() const { return operator*(); }
|
|
|
|
inline _Self& operator++() { // Preincrement
|
|
VisitStack.pop();
|
|
if (!VisitStack.empty())
|
|
traverseChild();
|
|
return *this;
|
|
}
|
|
|
|
inline _Self operator++(int) { // Postincrement
|
|
_Self tmp = *this; ++*this; return tmp;
|
|
}
|
|
};
|
|
|
|
inline po_iterator po_begin( Method *M) {
|
|
return po_iterator(M->front());
|
|
}
|
|
inline po_const_iterator po_begin(const Method *M) {
|
|
return po_const_iterator(M->front());
|
|
}
|
|
inline po_iterator po_end ( Method *M) {
|
|
return po_iterator();
|
|
}
|
|
inline po_const_iterator po_end (const Method *M) {
|
|
return po_const_iterator();
|
|
}
|
|
|
|
inline po_iterator po_begin( BasicBlock *BB) {
|
|
return po_iterator(BB);
|
|
}
|
|
inline po_const_iterator po_begin(const BasicBlock *BB) {
|
|
return po_const_iterator(BB);
|
|
}
|
|
inline po_iterator po_end ( BasicBlock *BB) {
|
|
return po_iterator();
|
|
}
|
|
inline po_const_iterator po_end (const BasicBlock *BB) {
|
|
return po_const_iterator();
|
|
}
|
|
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// Reverse Post Order CFG iterator code
|
|
//
|
|
|
|
class ReversePostOrderTraversal {
|
|
vector<BasicBlock*> Blocks; // Block list in normal PO order
|
|
inline void Initialize(BasicBlock *BB) {
|
|
copy(po_begin(BB), po_end(BB), back_inserter(Blocks));
|
|
}
|
|
public:
|
|
inline ReversePostOrderTraversal(Method *M) {
|
|
Initialize(M->front());
|
|
}
|
|
inline ReversePostOrderTraversal(BasicBlock *BB) {
|
|
Initialize(BB);
|
|
}
|
|
|
|
// Because we want a reverse post order, use reverse iterators from the vector
|
|
inline rpo_iterator begin() { return Blocks.rbegin(); }
|
|
inline rpo_iterator end() { return Blocks.rend(); }
|
|
};
|
|
|
|
} // End namespace cfg
|
|
|
|
#endif
|