forked from OSchip/llvm-project
61 lines
2.0 KiB
C++
61 lines
2.0 KiB
C++
//===-- DbgInfoUtils.cpp - DbgInfo Utilities -------------------------------==//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// Utility functions to manipulate debugging information.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Transforms/Utils/DbgInfoUtils.h"
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#include "llvm/IntrinsicInst.h"
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using namespace llvm;
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/// RemoveDeadDbgIntrinsics - Remove dead dbg intrinsics from this
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/// basic block.
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void llvm::RemoveDeadDbgIntrinsics(BasicBlock &BB) {
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BasicBlock::iterator BI = BB.begin(), BE = BB.end();
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if (BI == BE) return;
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Instruction *Prev = BI; ++BI;
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while (BI != BE) {
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Instruction *Next = BI; ++BI;
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DbgInfoIntrinsic *DBI_Prev = dyn_cast<DbgInfoIntrinsic>(Prev);
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if (!DBI_Prev) {
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Prev = Next;
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continue;
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}
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// If there are two consecutive llvm.dbg.stoppoint calls then
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// it is likely that the optimizer deleted code in between these
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// two intrinsics.
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DbgInfoIntrinsic *DBI_Next = dyn_cast<DbgInfoIntrinsic>(Next);
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if (DBI_Next
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&& DBI_Prev->getIntrinsicID() == llvm::Intrinsic::dbg_stoppoint
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&& DBI_Next->getIntrinsicID() == llvm::Intrinsic::dbg_stoppoint)
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Prev->eraseFromParent();
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// If a llvm.dbg.stoppoint is placed just before an unconditional
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// branch then remove the llvm.dbg.stoppoint intrinsic.
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else if (BranchInst *UC = dyn_cast<BranchInst>(Next)) {
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if (UC->isUnconditional()
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&& DBI_Prev->getIntrinsicID() == llvm::Intrinsic::dbg_stoppoint)
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Prev->eraseFromParent();
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}
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Prev = Next;
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}
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}
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/// RemoveDeadDbgIntrinsics - Remove dead dbg intrinsics from this function.
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void llvm::RemoveDeadDbgIntrinsics(Function &F) {
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for (Function::iterator FI = F.begin(), FE = F.end();
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FI != FE; ++FI)
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RemoveDeadDbgIntrinsics(*FI);
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}
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