mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-11-01 15:11:24 +00:00
7170838f84
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@13 91177308-0d34-0410-b5e6-96231b3b80d8
283 lines
9.2 KiB
C++
283 lines
9.2 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
|
|
//an iterator to iterate over the basic
|
|
// blocks of a method in depth first order.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef LLVM_CFG_H
|
|
#define LLVM_CFG_H
|
|
|
|
#include <set>
|
|
#include <stack>
|
|
#include "llvm/BasicBlock.h"
|
|
#include "llvm/InstrTypes.h"
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// Interface
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
//===--------------------------------------------------------------------===//
|
|
// Predecessor iterator code
|
|
//===--------------------------------------------------------------------===//
|
|
//
|
|
// This is used to figure out what basic blocks we could be coming from.
|
|
//
|
|
|
|
// Forward declare iterator class template...
|
|
template <class _Ptr, class _USE_iterator> class PredIterator;
|
|
|
|
typedef PredIterator<BasicBlock*, BasicBlock::use_iterator> pred_iterator;
|
|
typedef PredIterator<const BasicBlock*,
|
|
BasicBlock::use_const_iterator> pred_const_iterator;
|
|
|
|
inline pred_iterator pred_begin( BasicBlock *BB);
|
|
inline pred_const_iterator pred_begin(const BasicBlock *BB);
|
|
inline pred_iterator pred_end ( BasicBlock *BB);
|
|
inline pred_const_iterator pred_end (const BasicBlock *BB);
|
|
|
|
|
|
//===--------------------------------------------------------------------===//
|
|
// Successor iterator code
|
|
//===--------------------------------------------------------------------===//
|
|
//
|
|
// This is used to figure out what basic blocks we could be going to...
|
|
//
|
|
|
|
// Forward declare iterator class template...
|
|
template <class _Term, class _BB> class SuccIterator;
|
|
|
|
typedef SuccIterator<TerminatorInst*, BasicBlock*> succ_iterator;
|
|
typedef SuccIterator<const TerminatorInst*,
|
|
const BasicBlock*> succ_const_iterator;
|
|
|
|
inline succ_iterator succ_begin( BasicBlock *BB);
|
|
inline succ_const_iterator succ_begin(const BasicBlock *BB);
|
|
inline succ_iterator succ_end ( BasicBlock *BB);
|
|
inline succ_const_iterator succ_end (const BasicBlock *BB);
|
|
|
|
|
|
//===--------------------------------------------------------------------===//
|
|
// Depth First CFG iterator code
|
|
//===--------------------------------------------------------------------===//
|
|
//
|
|
// This is used to figure out what basic blocks we could be going to...
|
|
//
|
|
|
|
// Forward declare iterator class template...
|
|
template<class BBType, class SuccItTy> class DFIterator;
|
|
|
|
typedef DFIterator<BasicBlock, succ_iterator> df_iterator;
|
|
typedef DFIterator<const BasicBlock,
|
|
succ_const_iterator> df_const_iterator;
|
|
|
|
inline df_iterator df_begin( BasicBlock *BB);
|
|
inline df_const_iterator df_begin(const BasicBlock *BB);
|
|
inline df_iterator df_end ( BasicBlock *BB);
|
|
inline df_const_iterator df_end (const BasicBlock *BB);
|
|
|
|
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// Implementation
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// Basic Block Predecessor Iterator
|
|
//
|
|
|
|
template <class _Ptr, class _USE_iterator> // Predecessor Iterator
|
|
class PredIterator {
|
|
const _Ptr ThisBB;
|
|
_USE_iterator It;
|
|
public:
|
|
typedef PredIterator<_Ptr,_USE_iterator> _Self;
|
|
|
|
typedef bidirectional_iterator_tag iterator_category;
|
|
typedef _Ptr pointer;
|
|
|
|
inline void advancePastConstPool() {
|
|
// Loop to ignore constant pool references
|
|
while (It != ThisBB->use_end() &&
|
|
((*It)->getValueType() != Value::InstructionVal))
|
|
++It;
|
|
}
|
|
|
|
inline PredIterator(_Ptr BB) : ThisBB(BB), It(BB->use_begin()) {
|
|
advancePastConstPool();
|
|
}
|
|
inline PredIterator(_Ptr BB, bool) : ThisBB(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 {
|
|
assert ((*It)->getValueType() == Value::InstructionVal);
|
|
return ((Instruction *)(*It))->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 {
|
|
const _Term Term;
|
|
unsigned idx;
|
|
public:
|
|
typedef SuccIterator<_Term, _BB> _Self;
|
|
typedef forward_iterator_tag iterator_category;
|
|
typedef _BB pointer;
|
|
|
|
inline SuccIterator(_Term T) : Term(T), idx(0) {} // begin iterator
|
|
inline SuccIterator(_Term T, bool)
|
|
: Term(T), idx(Term->getNumSuccessors()) {} // end iterator
|
|
|
|
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);
|
|
}
|
|
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// Depth First Iterator
|
|
//
|
|
|
|
template<class BBType, class SuccItTy>
|
|
class DFIterator { // BasicBlock Depth First Iterator
|
|
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;
|
|
public:
|
|
typedef DFIterator<BBType, SuccItTy> _Self;
|
|
|
|
typedef forward_iterator_tag iterator_category;
|
|
typedef BBType *pointer;
|
|
|
|
inline DFIterator(BBType *BB) {
|
|
Visited.insert(BB);
|
|
VisitStack.push(make_pair(BB, succ_begin(BB)));
|
|
}
|
|
inline DFIterator(BBType *BB, bool) { /* 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
|
|
do {
|
|
pair<BBType *, SuccItTy> &Top = VisitStack.top();
|
|
BBType *BB = Top.first;
|
|
SuccItTy &It = Top.second;
|
|
|
|
do {
|
|
BBType *Next = *It++;
|
|
if (!Visited.count(Next)) { // Has our next sibling been visited?
|
|
// No, do it now.
|
|
VisitStack.push(make_pair(Next, succ_begin(BB)));
|
|
return *this;
|
|
}
|
|
} while (It != succ_end(BB));
|
|
|
|
// 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;
|
|
}
|
|
};
|
|
|
|
inline df_iterator df_begin(BasicBlock *BB) {
|
|
return df_iterator(BB);
|
|
}
|
|
inline df_const_iterator df_begin(const BasicBlock *BB) {
|
|
return df_const_iterator(BB);
|
|
}
|
|
inline df_iterator df_end(BasicBlock *BB) {
|
|
return df_iterator(BB, true);
|
|
}
|
|
inline df_const_iterator df_end(const BasicBlock *BB) {
|
|
return df_const_iterator(BB, true);
|
|
}
|
|
|
|
#endif
|