diff options
Diffstat (limited to 'include/llvm/Analysis/LoopInfo.h')
-rw-r--r-- | include/llvm/Analysis/LoopInfo.h | 49 |
1 files changed, 37 insertions, 12 deletions
diff --git a/include/llvm/Analysis/LoopInfo.h b/include/llvm/Analysis/LoopInfo.h index aeeea3c..bef03e9 100644 --- a/include/llvm/Analysis/LoopInfo.h +++ b/include/llvm/Analysis/LoopInfo.h @@ -79,7 +79,7 @@ class LoopBase { operator=(const LoopBase<BlockT, LoopT> &) LLVM_DELETED_FUNCTION; public: /// Loop ctor - This creates an empty loop. - LoopBase() : ParentLoop(0) {} + LoopBase() : ParentLoop(nullptr) {} ~LoopBase() { for (size_t i = 0, e = SubLoops.size(); i != e; ++i) delete SubLoops[i]; @@ -106,7 +106,7 @@ public: /// bool contains(const LoopT *L) const { if (L == this) return true; - if (L == 0) return false; + if (!L) return false; return contains(L->getParentLoop()); } @@ -265,7 +265,7 @@ public: /// updates the loop depth of the new child. /// void addChildLoop(LoopT *NewChild) { - assert(NewChild->ParentLoop == 0 && "NewChild already has a parent!"); + assert(!NewChild->ParentLoop && "NewChild already has a parent!"); NewChild->ParentLoop = static_cast<LoopT *>(this); SubLoops.push_back(NewChild); } @@ -278,7 +278,7 @@ public: LoopT *Child = *I; assert(Child->ParentLoop == this && "Child is not a child of this loop!"); SubLoops.erase(SubLoops.begin()+(I-begin())); - Child->ParentLoop = 0; + Child->ParentLoop = nullptr; return Child; } @@ -333,7 +333,7 @@ public: protected: friend class LoopInfoBase<BlockT, LoopT>; - explicit LoopBase(BlockT *BB) : ParentLoop(0) { + explicit LoopBase(BlockT *BB) : ParentLoop(nullptr) { Blocks.push_back(BB); DenseBlockSet.insert(BB); } @@ -372,7 +372,7 @@ public: /// If null, the terminator of the loop preheader is used. /// bool makeLoopInvariant(Value *V, bool &Changed, - Instruction *InsertPt = 0) const; + Instruction *InsertPt = nullptr) const; /// makeLoopInvariant - If the given instruction is inside of the /// loop and it can be hoisted, do so to make it trivially loop-invariant. @@ -384,7 +384,7 @@ public: /// If null, the terminator of the loop preheader is used. /// bool makeLoopInvariant(Instruction *I, bool &Changed, - Instruction *InsertPt = 0) const; + Instruction *InsertPt = nullptr) const; /// getCanonicalInductionVariable - Check to see if the loop has a canonical /// induction variable: an integer recurrence that starts at 0 and increments @@ -453,6 +453,31 @@ public: void dump() const; + /// \brief Return the debug location of the start of this loop. + /// This looks for a BB terminating instruction with a known debug + /// location by looking at the preheader and header blocks. If it + /// cannot find a terminating instruction with location information, + /// it returns an unknown location. + DebugLoc getStartLoc() const { + DebugLoc StartLoc; + BasicBlock *HeadBB; + + // Try the pre-header first. + if ((HeadBB = getLoopPreheader()) != nullptr) { + StartLoc = HeadBB->getTerminator()->getDebugLoc(); + if (!StartLoc.isUnknown()) + return StartLoc; + } + + // If we have no pre-header or there are no instructions with debug + // info in it, try the header. + HeadBB = getHeader(); + if (HeadBB) + StartLoc = HeadBB->getTerminator()->getDebugLoc(); + + return StartLoc; + } + private: friend class LoopInfoBase<BasicBlock, Loop>; explicit Loop(BasicBlock *BB) : LoopBase<BasicBlock, Loop>(BB) {} @@ -531,7 +556,7 @@ public: LoopT *removeLoop(iterator I) { assert(I != end() && "Cannot remove end iterator!"); LoopT *L = *I; - assert(L->getParentLoop() == 0 && "Not a top-level loop!"); + assert(!L->getParentLoop() && "Not a top-level loop!"); TopLevelLoops.erase(TopLevelLoops.begin() + (I-begin())); return L; } @@ -555,14 +580,14 @@ public: std::find(TopLevelLoops.begin(), TopLevelLoops.end(), OldLoop); assert(I != TopLevelLoops.end() && "Old loop not at top level!"); *I = NewLoop; - assert(NewLoop->ParentLoop == 0 && OldLoop->ParentLoop == 0 && + assert(!NewLoop->ParentLoop && !OldLoop->ParentLoop && "Loops already embedded into a subloop!"); } /// addTopLevelLoop - This adds the specified loop to the collection of /// top-level loops. void addTopLevelLoop(LoopT *New) { - assert(New->getParentLoop() == 0 && "Loop already in subloop!"); + assert(!New->getParentLoop() && "Loop already in subloop!"); TopLevelLoops.push_back(New); } @@ -583,7 +608,7 @@ public: static bool isNotAlreadyContainedIn(const LoopT *SubLoop, const LoopT *ParentLoop) { - if (SubLoop == 0) return true; + if (!SubLoop) return true; if (SubLoop == ParentLoop) return false; return isNotAlreadyContainedIn(SubLoop->getParentLoop(), ParentLoop); } @@ -660,7 +685,7 @@ public: void releaseMemory() override { LI.releaseMemory(); } - void print(raw_ostream &O, const Module* M = 0) const override; + void print(raw_ostream &O, const Module* M = nullptr) const override; void getAnalysisUsage(AnalysisUsage &AU) const override; |