Follow-up to r204790: don't try to emit line tables if there are no functions with DI in the TU

llvm-svn: 204795

llvm/lib/CodeGen/AsmPrinter/WinCodeViewLineTables.cpp

@@ -304,11 +304,18 @@ void WinCodeViewLineTables::beginFunction(const MachineFunction *MF) {
   }
 }
 
-void WinCodeViewLineTables::endFunction(const MachineFunction *) {
+void WinCodeViewLineTables::endFunction(const MachineFunction *MF) {
   if (!Asm || !CurFn)  // We haven't created any debug info for this function.
     return;
 
-  if (!CurFn->Instrs.empty()) {
+  const Function *GV = MF->getFunction();
+  assert(FnDebugInfo.count(GV) == true);
+  assert(CurFn == &FnDebugInfo[GV]);
+
+  if (CurFn->Instrs.empty()) {
+    FnDebugInfo.erase(GV);
+    VisitedFunctions.pop_back();
+  } else {
     // Define end label for subprogram.
     MCSymbol *FunctionEndSym = Asm->OutStreamer.getContext().CreateTempSymbol();
     Asm->OutStreamer.EmitLabel(FunctionEndSym);

llvm/test/DebugInfo/COFF/asan2.ll

+; RUN: llc -mcpu=core2 -mtriple=i686-pc-win32 -O0 < %s | FileCheck --check-prefix=X86 %s
+
+; This LL file was generated by running clang on the following code with
+; -fsanitize=address
+; D:\asan.c:
+; 1 unsigned char c = 42;
+
+; Just make sure we don't try to emit the line table.
+; X86-NOT: .section        .debug$S,"rn"
+
+; ModuleID = 'asan.c'
+target datalayout = "e-m:w-p:32:32-i64:64-f80:32-n8:16:32-S32"
+target triple = "i686-pc-win32"
+
+@c = global { i8, [63 x i8] } { i8 42, [63 x i8] zeroinitializer }, align 32
+@llvm.global_ctors = appending global [1 x { i32, void ()* }] [{ i32, void ()* } { i32 1, void ()* @asan.module_ctor }]
+@__asan_gen_ = private constant [7 x i8] c"asan.c\00", align 1
+@__asan_gen_1 = private unnamed_addr constant [2 x i8] c"c\00", align 1
+@0 = internal global [1 x { i32, i32, i32, i32, i32, i32 }] [{ i32, i32, i32, i32, i32, i32 } { i32 ptrtoint ({ i8, [63 x i8] }* @c to i32), i32 1, i32 64, i32 ptrtoint ([2 x i8]* @__asan_gen_1 to i32), i32 ptrtoint ([7 x i8]* @__asan_gen_ to i32), i32 0 }]
+@llvm.global_dtors = appending global [1 x { i32, void ()* }] [{ i32, void ()* } { i32 1, void ()* @asan.module_dtor }]
+
+define internal void @asan.module_ctor() {
+  call void @__asan_init_v3()
+  call void @__asan_register_globals(i32 ptrtoint ([1 x { i32, i32, i32, i32, i32, i32 }]* @0 to i32), i32 1)
+  ret void
+}
+
+declare void @__asan_init_v3()
+
+declare void @__asan_before_dynamic_init(i32)
+
+declare void @__asan_after_dynamic_init()
+
+declare void @__asan_register_globals(i32, i32)
+
+declare void @__asan_unregister_globals(i32, i32)
+
+define internal void @asan.module_dtor() {
+  call void @__asan_unregister_globals(i32 ptrtoint ([1 x { i32, i32, i32, i32, i32, i32 }]* @0 to i32), i32 1)
+  ret void
+}
+
+!llvm.dbg.cu = !{!0}
+!llvm.module.flags = !{!3, !4}
+!llvm.ident = !{!5}
+
+!0 = metadata !{i32 786449, metadata !1, i32 12, metadata !"clang version 3.5.0 ", i1 false, metadata !"", i32 0, metadata !2, metadata !2, metadata !2, metadata !2, metadata !2, metadata !"", i32 2} ; [ DW_TAG_compile_unit ] [D:\/asan.c] [DW_LANG_C99]
+!1 = metadata !{metadata !"asan.c", metadata !"D:\5C"}
+!2 = metadata !{}
+!3 = metadata !{i32 2, metadata !"Dwarf Version", i32 4}
+!4 = metadata !{i32 1, metadata !"Debug Info Version", i32 1}
+!5 = metadata !{metadata !"clang version 3.5.0 "}