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Factor the predeclarations of the CFG.h functionality into a seperate, new header
file: CFGdecls.h This allows the addition of BasicBlock::(pred|succ)_iterator typedefs. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@40 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
@@ -28,144 +28,10 @@
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// Interface
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//===----------------------------------------------------------------------===//
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#include "llvm/CFGdecls.h" // See this file for concise interface info
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namespace cfg {
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//===--------------------------------------------------------------------===//
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// Predecessor iterator code
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//===--------------------------------------------------------------------===//
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//
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// This is used to figure out what basic blocks we could be coming from.
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//
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// Forward declare iterator class template...
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template <class _Ptr, class _USE_iterator> class PredIterator;
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typedef PredIterator<BasicBlock*, BasicBlock::use_iterator> pred_iterator;
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typedef PredIterator<const BasicBlock*,
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BasicBlock::use_const_iterator> pred_const_iterator;
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inline pred_iterator pred_begin( BasicBlock *BB);
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inline pred_const_iterator pred_begin(const BasicBlock *BB);
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inline pred_iterator pred_end ( BasicBlock *BB);
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inline pred_const_iterator pred_end (const BasicBlock *BB);
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//===--------------------------------------------------------------------===//
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// Successor iterator code
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//===--------------------------------------------------------------------===//
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//
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// This is used to figure out what basic blocks we could be going to...
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//
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// Forward declare iterator class template...
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template <class _Term, class _BB> class SuccIterator;
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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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inline succ_const_iterator succ_begin(const BasicBlock *BB);
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inline succ_iterator succ_end ( BasicBlock *BB);
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inline succ_const_iterator succ_end (const BasicBlock *BB);
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//===--------------------------------------------------------------------===//
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// <Reverse> Depth First CFG iterator code
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//===--------------------------------------------------------------------===//
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//
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// This is used to visit basic blocks in a method in either depth first, or
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// reverse depth first ordering, depending on the value passed to the df_begin
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// method.
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//
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// Forward declare iterator class template...
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template<class BBType, class SuccItTy> class DFIterator;
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typedef DFIterator<BasicBlock, succ_iterator> df_iterator;
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typedef DFIterator<const BasicBlock,
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succ_const_iterator> df_const_iterator;
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inline df_iterator df_begin( Method *BB, bool Reverse = false);
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inline df_const_iterator df_begin(const Method *BB, bool Reverse = false);
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inline df_iterator df_end ( Method *BB);
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inline df_const_iterator df_end (const Method *BB);
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inline df_iterator df_begin( BasicBlock *BB, bool Reverse = false);
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inline df_const_iterator df_begin(const BasicBlock *BB, bool Reverse = false);
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inline df_iterator df_end ( BasicBlock *BB);
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inline df_const_iterator df_end (const BasicBlock *BB);
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//===--------------------------------------------------------------------===//
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// Post Order CFG iterator code
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//===--------------------------------------------------------------------===//
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//
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// This is used to visit basic blocks in a method in standard post order.
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//
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// Forward declare iterator class template...
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template<class BBType, class SuccItTy> class POIterator;
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typedef POIterator<BasicBlock, succ_iterator> po_iterator;
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typedef POIterator<const BasicBlock,
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succ_const_iterator> po_const_iterator;
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inline po_iterator po_begin( Method *BB);
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inline po_const_iterator po_begin(const Method *BB);
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inline po_iterator po_end ( Method *BB);
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inline po_const_iterator po_end (const Method *BB);
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inline po_iterator po_begin( BasicBlock *BB);
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inline po_const_iterator po_begin(const BasicBlock *BB);
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inline po_iterator po_end ( BasicBlock *BB);
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inline po_const_iterator po_end (const BasicBlock *BB);
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//===--------------------------------------------------------------------===//
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// Reverse Post Order CFG iterator code
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//===--------------------------------------------------------------------===//
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//
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// This is used to visit basic blocks in a method in reverse post order. This
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// class is awkward to use because I don't know a good incremental algorithm to
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// computer RPO from a graph. Because of this, the construction of the
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// ReversePostOrderTraversal object is expensive (it must walk the entire graph
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// with a postorder iterator to build the data structures). The moral of this
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// story is: Don't create more ReversePostOrderTraversal classes than neccesary.
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//
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// This class should be used like this:
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// {
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// cfg::ReversePostOrderTraversal RPOT(MethodPtr); // Expensive to create
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// for (cfg::rpo_iterator I = RPOT.begin(); I != RPOT.end(); ++I) {
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// ...
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// }
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// for (cfg::rpo_iterator I = RPOT.begin(); I != RPOT.end(); ++I) {
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// ...
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// }
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// }
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//
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//typedef reverse_iterator<vector<BasicBlock*>::const_iterator>
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// rpo_const_iterator;
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typedef reverse_iterator<vector<BasicBlock*>::iterator> rpo_iterator;
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class ReversePostOrderTraversal {
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vector<BasicBlock*> Blocks; // Block list in normal PO order
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void Initialize(BasicBlock *BB); // Implemented down below
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public:
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inline ReversePostOrderTraversal(Method *M) {
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Initialize(M->getBasicBlocks().front());
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}
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inline ReversePostOrderTraversal(BasicBlock *BB) {
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Initialize(BB);
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}
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// Because we want a reverse post order, use reverse iterators from the vector
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inline rpo_iterator begin() { return Blocks.rbegin(); }
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inline rpo_iterator end() { return Blocks.rend(); }
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};
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//===----------------------------------------------------------------------===//
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// Implementation
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//===----------------------------------------------------------------------===//
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@@ -496,9 +362,24 @@ inline po_const_iterator po_end (const BasicBlock *BB) {
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//===----------------------------------------------------------------------===//
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// Reverse Post Order CFG iterator code
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//
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void ReversePostOrderTraversal::Initialize(BasicBlock *BB) {
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copy(po_begin(BB), po_end(BB), back_inserter(Blocks));
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}
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class ReversePostOrderTraversal {
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vector<BasicBlock*> Blocks; // Block list in normal PO order
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inline void Initialize(BasicBlock *BB) {
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copy(po_begin(BB), po_end(BB), back_inserter(Blocks));
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}
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public:
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inline ReversePostOrderTraversal(Method *M) {
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Initialize(M->getBasicBlocks().front());
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}
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inline ReversePostOrderTraversal(BasicBlock *BB) {
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Initialize(BB);
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}
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// Because we want a reverse post order, use reverse iterators from the vector
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inline rpo_iterator begin() { return Blocks.rbegin(); }
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inline rpo_iterator end() { return Blocks.rend(); }
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};
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} // End namespace cfg
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