From f4076dc9958421b4989a43994b6d26906ab58d08 Mon Sep 17 00:00:00 2001
From: Timur Iskhodzhanov <timurrrr@google.com>
Date: Fri, 26 Dec 2014 17:00:51 +0000
Subject: [PATCH] Band-aid fix for PR22032: don't emit DWARF debug info if
 AddressSanitizer is enabled on Windows

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@224860 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/CodeGen/AsmPrinter/AsmPrinter.cpp   | 19 ++++++++++++++++---
 test/DebugInfo/COFF/asan-module-ctor.ll |  3 +++
 2 files changed, 19 insertions(+), 3 deletions(-)

diff --git a/lib/CodeGen/AsmPrinter/AsmPrinter.cpp b/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
index 80221d7feb6..97ef12c8328 100644
--- a/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
+++ b/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
@@ -222,12 +222,25 @@ bool AsmPrinter::doInitialization(Module &M) {
   }
 
   if (MAI->doesSupportDebugInformation()) {
-    if (Triple(TM.getTargetTriple()).isKnownWindowsMSVCEnvironment())
+    bool skip_dwarf = false;
+    if (Triple(TM.getTargetTriple()).isKnownWindowsMSVCEnvironment()) {
       Handlers.push_back(HandlerInfo(new WinCodeViewLineTables(this),
                                      DbgTimerName,
                                      CodeViewLineTablesGroupName));
-    DD = new DwarfDebug(this, &M);
-    Handlers.push_back(HandlerInfo(DD, DbgTimerName, DWARFGroupName));
+      // FIXME: Don't emit DWARF debug info if there's at least one function
+      // with AddressSanitizer instrumentation.
+      // This is a band-aid fix for PR22032.
+      for (auto &F : M.functions()) {
+        if (F.hasFnAttribute(Attribute::SanitizeAddress)) {
+          skip_dwarf = true;
+          break;
+        }
+      }
+    }
+    if (!skip_dwarf) {
+      DD = new DwarfDebug(this, &M);
+      Handlers.push_back(HandlerInfo(DD, DbgTimerName, DWARFGroupName));
+    }
   }
 
   EHStreamer *ES = nullptr;
diff --git a/test/DebugInfo/COFF/asan-module-ctor.ll b/test/DebugInfo/COFF/asan-module-ctor.ll
index 039a55d44ad..02c2a5810dd 100644
--- a/test/DebugInfo/COFF/asan-module-ctor.ll
+++ b/test/DebugInfo/COFF/asan-module-ctor.ll
@@ -13,6 +13,9 @@
 ; X86-NEXT: calll   ___asan_init_v3
 ; X86-NEXT: retl
 
+; Make sure we don't put any DWARF debug info for ASan-instrumented modules.
+; X86-NOT: DWARF
+
 ; ModuleID = 'asan.c'
 target datalayout = "e-m:w-p:32:32-i64:64-f80:32-n8:16:32-S32"
 target triple = "i686-pc-win32"