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Add "check/remove dbg var" helper routines.
llvm-svn: 66223
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@ -17,6 +17,7 @@
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namespace llvm {
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class User;
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class BasicBlock;
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class Instruction;
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class Value;
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@ -100,6 +101,14 @@ AllocaInst *DemotePHIToStack(PHINode *P, Instruction *AllocaPoint = 0);
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/// with DbgInfoIntrinsic that use the instruction I.
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bool OnlyUsedByDbgInfoIntrinsics(Instruction *I,
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SmallVectorImpl<DbgInfoIntrinsic *> *DbgInUses = 0);
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/// UserIsDebugInfo - Return true if U is a constant expr used by
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/// llvm.dbg.variable or llvm.dbg.global_variable
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bool UserIsDebugInfo(User *U);
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/// RemoveDbgInfoUser - Remove an User which is representing debug info.
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void RemoveDbgInfoUser(User *U);
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} // End llvm namespace
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#endif
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@ -14,11 +14,13 @@
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#include "llvm/Transforms/Utils/Local.h"
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#include "llvm/Constants.h"
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#include "llvm/GlobalVariable.h"
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#include "llvm/DerivedTypes.h"
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#include "llvm/Instructions.h"
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#include "llvm/Intrinsics.h"
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#include "llvm/IntrinsicInst.h"
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#include "llvm/Analysis/ConstantFolding.h"
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#include "llvm/Analysis/DebugInfo.h"
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#include "llvm/Target/TargetData.h"
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#include "llvm/Support/GetElementPtrTypeIterator.h"
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#include "llvm/Support/MathExtras.h"
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@ -273,3 +275,45 @@ bool llvm::OnlyUsedByDbgInfoIntrinsics(Instruction *I,
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}
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return true;
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}
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/// UserIsDebugInfo - Return true if U is a constant expr used by
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/// llvm.dbg.variable or llvm.dbg.global_variable
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bool llvm::UserIsDebugInfo(User *U) {
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ConstantExpr *CE = dyn_cast<ConstantExpr>(U);
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if (!CE || CE->getNumUses() != 1)
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return false;
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Constant *Init = dyn_cast<Constant>(CE->use_back());
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if (!Init || Init->getNumUses() != 1)
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return false;
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GlobalVariable *GV = dyn_cast<GlobalVariable>(Init->use_back());
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if (!GV || !GV->hasInitializer() || GV->getInitializer() != Init)
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return false;
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DIVariable DV(GV);
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if (!DV.isNull())
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return true; // User is llvm.dbg.variable
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DIGlobalVariable DGV(GV);
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if (!DGV.isNull())
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return true; // User is llvm.dbg.global_variable
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return false;
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}
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/// RemoveDbgInfoUser - Remove an User which is representing debug info.
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void llvm::RemoveDbgInfoUser(User *U) {
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assert (UserIsDebugInfo(U) && "Unexpected User!");
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ConstantExpr *CE = cast<ConstantExpr>(U);
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while (!CE->use_empty()) {
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Constant *C = cast<Constant>(CE->use_back());
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while (!C->use_empty()) {
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GlobalVariable *GV = cast<GlobalVariable>(C->use_back());
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GV->eraseFromParent();
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}
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C->destroyConstant();
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}
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CE->destroyConstant();
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}
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