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If an AllocaInst referred by DbgDeclareInst is used by a LoadInst then the LoadInst should also get a corresponding llvm.dbg.value intrinsic.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127924 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Devang Patel 2011-03-18 23:45:43 +00:00
parent 79fcad85a4
commit 36fae67831
2 changed files with 30 additions and 0 deletions
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6
include/llvm/Transforms/Utils/Local.h
View File

@ -24,6 +24,7 @@ class BranchInst;
class Instruction;
class DbgDeclareInst;
class StoreInst;
class LoadInst;
class Value;
class Pass;
class PHINode;
@ -170,6 +171,11 @@ static inline unsigned getKnownAlignment(Value *V, const TargetData *TD = 0) {
bool ConvertDebugDeclareToDebugValue(DbgDeclareInst *DDI,
StoreInst *SI, DIBuilder &Builder);
/// Inserts a llvm.dbg.value instrinsic before the stores to an alloca'd value
/// that has an associated llvm.dbg.decl intrinsic.
bool ConvertDebugDeclareToDebugValue(DbgDeclareInst *DDI,
LoadInst *LI, DIBuilder &Builder);
/// LowerDbgDeclare - Lowers llvm.dbg.declare intrinsics into appropriate set
/// of llvm.dbg.value intrinsics.
bool LowerDbgDeclare(Function &F);

24
lib/Transforms/Utils/Local.cpp
View File

@ -794,6 +794,28 @@ bool llvm::ConvertDebugDeclareToDebugValue(DbgDeclareInst *DDI,
return true;
}
/// Inserts a llvm.dbg.value instrinsic before the stores to an alloca'd value
/// that has an associated llvm.dbg.decl intrinsic.
bool llvm::ConvertDebugDeclareToDebugValue(DbgDeclareInst *DDI,
LoadInst *LI, DIBuilder &Builder) {
DIVariable DIVar(DDI->getVariable());
if (!DIVar.Verify())
return false;
Instruction *DbgVal =
Builder.insertDbgValueIntrinsic(LI->getOperand(0), 0,
DIVar, LI);
// Propagate any debug metadata from the store onto the dbg.value.
DebugLoc LIDL = LI->getDebugLoc();
if (!LIDL.isUnknown())
DbgVal->setDebugLoc(LIDL);
// Otherwise propagate debug metadata from dbg.declare.
else
DbgVal->setDebugLoc(DDI->getDebugLoc());
return true;
}
/// LowerDbgDeclare - Lowers llvm.dbg.declare intrinsics into appropriate set
/// of llvm.dbg.value intrinsics.
bool llvm::LowerDbgDeclare(Function &F) {
@ -815,6 +837,8 @@ bool llvm::LowerDbgDeclare(Function &F) {
UI != E; ++UI)
if (StoreInst *SI = dyn_cast<StoreInst>(*UI))
ConvertDebugDeclareToDebugValue(DDI, SI, DIB);
else if (LoadInst *LI = dyn_cast<LoadInst>(*UI))
ConvertDebugDeclareToDebugValue(DDI, LI, DIB);
}
DDI->eraseFromParent();
}