mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-11-07 12:07:17 +00:00
00e08fcaa0
Add header guards to files that were missing guards. Remove #endif comments as they don't seem common in LLVM (we can easily add them back if we decide they're useful) Changes made by clang-tidy with minor tweaks. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@215558 91177308-0d34-0410-b5e6-96231b3b80d8
71 lines
2.3 KiB
C++
71 lines
2.3 KiB
C++
//===- PredIteratorCache.h - pred_iterator Cache ----------------*- C++ -*-===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file defines the PredIteratorCache class.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef LLVM_IR_PREDITERATORCACHE_H
|
|
#define LLVM_IR_PREDITERATORCACHE_H
|
|
|
|
#include "llvm/ADT/DenseMap.h"
|
|
#include "llvm/ADT/SmallVector.h"
|
|
#include "llvm/IR/CFG.h"
|
|
#include "llvm/Support/Allocator.h"
|
|
|
|
namespace llvm {
|
|
|
|
/// PredIteratorCache - This class is an extremely trivial cache for
|
|
/// predecessor iterator queries. This is useful for code that repeatedly
|
|
/// wants the predecessor list for the same blocks.
|
|
class PredIteratorCache {
|
|
/// BlockToPredsMap - Pointer to null-terminated list.
|
|
DenseMap<BasicBlock*, BasicBlock**> BlockToPredsMap;
|
|
DenseMap<BasicBlock*, unsigned> BlockToPredCountMap;
|
|
|
|
/// Memory - This is the space that holds cached preds.
|
|
BumpPtrAllocator Memory;
|
|
public:
|
|
|
|
/// GetPreds - Get a cached list for the null-terminated predecessor list of
|
|
/// the specified block. This can be used in a loop like this:
|
|
/// for (BasicBlock **PI = PredCache->GetPreds(BB); *PI; ++PI)
|
|
/// use(*PI);
|
|
/// instead of:
|
|
/// for (pred_iterator PI = pred_begin(BB), E = pred_end(BB); PI != E; ++PI)
|
|
BasicBlock **GetPreds(BasicBlock *BB) {
|
|
BasicBlock **&Entry = BlockToPredsMap[BB];
|
|
if (Entry) return Entry;
|
|
|
|
SmallVector<BasicBlock*, 32> PredCache(pred_begin(BB), pred_end(BB));
|
|
PredCache.push_back(nullptr); // null terminator.
|
|
|
|
BlockToPredCountMap[BB] = PredCache.size()-1;
|
|
|
|
Entry = Memory.Allocate<BasicBlock*>(PredCache.size());
|
|
std::copy(PredCache.begin(), PredCache.end(), Entry);
|
|
return Entry;
|
|
}
|
|
|
|
unsigned GetNumPreds(BasicBlock *BB) {
|
|
GetPreds(BB);
|
|
return BlockToPredCountMap[BB];
|
|
}
|
|
|
|
/// clear - Remove all information.
|
|
void clear() {
|
|
BlockToPredsMap.clear();
|
|
BlockToPredCountMap.clear();
|
|
Memory.Reset();
|
|
}
|
|
};
|
|
} // end namespace llvm
|
|
|
|
#endif
|