Improve debug info generated with enabled AddressSanitizer.

When ASan replaces <alloca instruction> with
<offset into a common large alloca>, it should also patch
llvm.dbg.declare calls and replace debug info descriptors to mark
that we've replaced alloca with a value that stores an address
of the user variable, not the user variable itself.

See PR11818 for more context.

llvm-svn: 169984

2 files changed, 39 insertions, 0 deletions

diff --git a/llvm/lib/Transforms/Instrumentation/AddressSanitizer.cpp b/llvm/lib/Transforms/Instrumentation/AddressSanitizer.cpp
index f095cff33c9..e0c610ffa48 100644
--- a/llvm/lib/Transforms/Instrumentation/AddressSanitizer.cpp
+++ b/llvm/lib/Transforms/Instrumentation/AddressSanitizer.cpp
@@ -25,6 +25,7 @@
 #include "llvm/ADT/StringExtras.h"
 #include "llvm/ADT/Triple.h"
 #include "llvm/DataLayout.h"
+#include "llvm/DIBuilder.h"
 #include "llvm/Function.h"
 #include "llvm/IRBuilder.h"
 #include "llvm/InlineAsm.h"
@@ -38,6 +39,7 @@
 #include "llvm/Support/system_error.h"
 #include "llvm/Target/TargetMachine.h"
 #include "llvm/Transforms/Utils/BasicBlockUtils.h"
+#include "llvm/Transforms/Utils/Local.h"
 #include "llvm/Transforms/Utils/ModuleUtils.h"
 #include "llvm/Type.h"
 #include <algorithm>
@@ -1158,6 +1160,7 @@ bool AddressSanitizer::poisonStackInFunction(Function &F) {
   SmallVector<Instruction*, 8> RetVec;
   uint64_t TotalSize = 0;
   bool HavePoisonedAllocas = false;
+  DIBuilder DIB(*F.getParent());
 
   // Filter out Alloca instructions we want (and can) handle.
   // Collect Ret instructions.
@@ -1228,6 +1231,7 @@ bool AddressSanitizer::poisonStackInFunction(Function &F) {
     Value *NewAllocaPtr = IRB.CreateIntToPtr(
             IRB.CreateAdd(LocalStackBase, ConstantInt::get(IntptrTy, Pos)),
             AI->getType());
+    replaceDbgDeclareForAlloca(AI, NewAllocaPtr, DIB);
     AI->replaceAllUsesWith(NewAllocaPtr);
     // Analyze lifetime intrinsics only for static allocas we handle.
     if (CheckLifetime)
diff --git a/llvm/lib/Transforms/Utils/Local.cpp b/llvm/lib/Transforms/Utils/Local.cpp
index 0e56817a1b7..58d973a61a1 100644
--- a/llvm/lib/Transforms/Utils/Local.cpp
+++ b/llvm/lib/Transforms/Utils/Local.cpp
@@ -928,3 +928,38 @@ DbgDeclareInst *llvm::FindAllocaDbgDeclare(Value *V) {
 
   return 0;
 }
+
+bool llvm::replaceDbgDeclareForAlloca(AllocaInst *AI, Value *NewAllocaAddress,
+                                      DIBuilder &Builder) {
+  DbgDeclareInst *DDI = FindAllocaDbgDeclare(AI);
+  if (!DDI)
+    return false;
+  DIVariable DIVar(DDI->getVariable());
+  if (!DIVar.Verify())
+    return false;
+
+  // Create a copy of the original DIDescriptor for user variable, appending
+  // "deref" operation to a list of address elements, as new llvm.dbg.declare
+  // will take a value storing address of the memory for variable, not
+  // alloca itself.
+  Type *Int64Ty = Type::getInt64Ty(AI->getContext());
+  SmallVector<Value*, 4> NewDIVarAddress;
+  if (DIVar.hasComplexAddress()) {
+    for (unsigned i = 0, n = DIVar.getNumAddrElements(); i < n; ++i) {
+      NewDIVarAddress.push_back(
+          ConstantInt::get(Int64Ty, DIVar.getAddrElement(i)));
+    }
+  }
+  NewDIVarAddress.push_back(ConstantInt::get(Int64Ty, DIBuilder::OpDeref));
+  DIVariable NewDIVar = Builder.createComplexVariable(
+      DIVar.getTag(), DIVar.getContext(), DIVar.getName(),
+      DIVar.getFile(), DIVar.getLineNumber(), DIVar.getType(),
+      NewDIVarAddress, DIVar.getArgNumber());
+
+  // Insert llvm.dbg.declare in the same basic block as the original alloca,
+  // and remove old llvm.dbg.declare.
+  BasicBlock *BB = AI->getParent();
+  Builder.insertDeclare(NewAllocaAddress, NewDIVar, BB);
+  DDI->eraseFromParent();
+  return true;
+}