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Add "check/remove dbg var" helper routines.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@66223 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Devang Patel 2009-03-06 00:19:37 +00:00
parent 46c95bbe06
commit c79e118247
2 changed files with 53 additions and 0 deletions
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9
include/llvm/Transforms/Utils/Local.h
View File

@ -17,6 +17,7 @@
namespace llvm {
class User;
class BasicBlock;
class Instruction;
class Value;
@ -100,6 +101,14 @@ AllocaInst *DemotePHIToStack(PHINode *P, Instruction *AllocaPoint = 0);
/// with DbgInfoIntrinsic that use the instruction I.
bool OnlyUsedByDbgInfoIntrinsics(Instruction *I,
SmallVectorImpl<DbgInfoIntrinsic *> *DbgInUses = 0);
/// UserIsDebugInfo - Return true if U is a constant expr used by
/// llvm.dbg.variable or llvm.dbg.global_variable
bool UserIsDebugInfo(User *U);
/// RemoveDbgInfoUser - Remove an User which is representing debug info.
void RemoveDbgInfoUser(User *U);
} // End llvm namespace
#endif

44
lib/Transforms/Utils/Local.cpp
View File

@ -14,11 +14,13 @@
#include "llvm/Transforms/Utils/Local.h"
#include "llvm/Constants.h"
#include "llvm/GlobalVariable.h"
#include "llvm/DerivedTypes.h"
#include "llvm/Instructions.h"
#include "llvm/Intrinsics.h"
#include "llvm/IntrinsicInst.h"
#include "llvm/Analysis/ConstantFolding.h"
#include "llvm/Analysis/DebugInfo.h"
#include "llvm/Target/TargetData.h"
#include "llvm/Support/GetElementPtrTypeIterator.h"
#include "llvm/Support/MathExtras.h"
@ -273,3 +275,45 @@ bool llvm::OnlyUsedByDbgInfoIntrinsics(Instruction *I,
}
return true;
}
/// UserIsDebugInfo - Return true if U is a constant expr used by
/// llvm.dbg.variable or llvm.dbg.global_variable
bool llvm::UserIsDebugInfo(User *U) {
ConstantExpr *CE = dyn_cast<ConstantExpr>(U);
if (!CE || CE->getNumUses() != 1)
return false;
Constant *Init = dyn_cast<Constant>(CE->use_back());
if (!Init || Init->getNumUses() != 1)
return false;
GlobalVariable *GV = dyn_cast<GlobalVariable>(Init->use_back());
if (!GV || !GV->hasInitializer() || GV->getInitializer() != Init)
return false;
DIVariable DV(GV);
if (!DV.isNull())
return true; // User is llvm.dbg.variable
DIGlobalVariable DGV(GV);
if (!DGV.isNull())
return true; // User is llvm.dbg.global_variable
return false;
}
/// RemoveDbgInfoUser - Remove an User which is representing debug info.
void llvm::RemoveDbgInfoUser(User *U) {
assert (UserIsDebugInfo(U) && "Unexpected User!");
ConstantExpr *CE = cast<ConstantExpr>(U);
while (!CE->use_empty()) {
Constant *C = cast<Constant>(CE->use_back());
while (!C->use_empty()) {
GlobalVariable *GV = cast<GlobalVariable>(C->use_back());
GV->eraseFromParent();
}
C->destroyConstant();
}
CE->destroyConstant();
}