From 59aecc1cf0b45744b51a2e960a63a3de33adeb0d Mon Sep 17 00:00:00 2001
From: Nick Lewycky <nicholas@mxc.ca>
Date: Thu, 5 Jun 2014 04:31:43 +0000
Subject: [PATCH] Fix coverage for files with global constructors again. Adds a
 testcase to the commit from r206671, as requested by David Blaikie.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@210239 91177308-0d34-0410-b5e6-96231b3b80d8
---
 .../Instrumentation/GCOVProfiling.cpp         | 10 ++++
 test/Transforms/GCOVProfiling/global-ctor.ll  | 58 +++++++++++++++++++
 2 files changed, 68 insertions(+)
 create mode 100644 test/Transforms/GCOVProfiling/global-ctor.ll

diff --git a/lib/Transforms/Instrumentation/GCOVProfiling.cpp b/lib/Transforms/Instrumentation/GCOVProfiling.cpp
index 583a0944689..cfeb62eb1f9 100644
--- a/lib/Transforms/Instrumentation/GCOVProfiling.cpp
+++ b/lib/Transforms/Instrumentation/GCOVProfiling.cpp
@@ -457,8 +457,13 @@ static bool functionHasLines(Function *F) {
       // Debug intrinsic locations correspond to the location of the
       // declaration, not necessarily any statements or expressions.
       if (isa<DbgInfoIntrinsic>(I)) continue;
+
       const DebugLoc &Loc = I->getDebugLoc();
       if (Loc.isUnknown()) continue;
+
+      // Artificial lines such as calls to the global constructors.
+      if (Loc.getLine() == 0) continue; 
+
       return true;
     }
   }
@@ -521,8 +526,13 @@ void GCOVProfiler::emitProfileNotes() {
           // Debug intrinsic locations correspond to the location of the
           // declaration, not necessarily any statements or expressions.
           if (isa<DbgInfoIntrinsic>(I)) continue;
+
           const DebugLoc &Loc = I->getDebugLoc();
           if (Loc.isUnknown()) continue;
+
+          // Artificial lines such as calls to the global constructors.
+          if (Loc.getLine() == 0) continue;
+
           if (Line == Loc.getLine()) continue;
           Line = Loc.getLine();
           if (SP != getDISubprogram(Loc.getScope(*Ctx))) continue;
diff --git a/test/Transforms/GCOVProfiling/global-ctor.ll b/test/Transforms/GCOVProfiling/global-ctor.ll
new file mode 100644
index 00000000000..722a0962ec5
--- /dev/null
+++ b/test/Transforms/GCOVProfiling/global-ctor.ll
@@ -0,0 +1,58 @@
+; RUN: echo '!16 = metadata !{metadata !"%T/global-ctor.ll", metadata !0}' > %t1
+; RUN: cat %s %t1 > %t2
+; RUN: opt -insert-gcov-profiling -disable-output < %t2
+; RUN: not grep '_GLOBAL__sub_I_global-ctor' %T/global-ctor.gcno
+; RUN: rm %T/global-ctor.gcno
+
+; REQUIRES: shell
+
+@x = global i32 0, align 4
+@llvm.global_ctors = appending global [1 x { i32, void ()*, i8* }] [{ i32, void ()*, i8* } { i32 65535, void ()* @_GLOBAL__sub_I_global-ctor.ll, i8* null }]
+
+; Function Attrs: nounwind
+define internal void @__cxx_global_var_init() #0 section ".text.startup" {
+entry:
+  br label %0
+
+; <label>:0                                       ; preds = %entry
+  %call = call i32 @_Z1fv(), !dbg !13
+  store i32 %call, i32* @x, align 4, !dbg !13
+  ret void, !dbg !13
+}
+
+declare i32 @_Z1fv() #1
+
+; Function Attrs: nounwind
+define internal void @_GLOBAL__sub_I_global-ctor.ll() #0 section ".text.startup" {
+entry:
+  br label %0
+
+; <label>:0                                       ; preds = %entry
+  call void @__cxx_global_var_init(), !dbg !14
+  ret void, !dbg !14
+}
+
+attributes #0 = { nounwind }
+attributes #1 = { "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "no-realign-stack" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
+
+!llvm.dbg.cu = !{!0}
+!llvm.module.flags = !{!10, !11}
+!llvm.gcov = !{!16}
+!llvm.ident = !{!12}
+
+!0 = metadata !{i32 786449, metadata !1, i32 4, metadata !"clang version 3.5.0 (trunk 210217)", i1 false, metadata !"", i32 0, metadata !2, metadata !2, metadata !3, metadata !2, metadata !2, metadata !"", i32 2} ; [ DW_TAG_compile_unit ] [/home/nlewycky/<stdin>] [DW_LANG_C_plus_plus]
+!1 = metadata !{metadata !"<stdin>", metadata !"/home/nlewycky"}
+!2 = metadata !{}
+!3 = metadata !{metadata !4, metadata !8}
+!4 = metadata !{i32 786478, metadata !5, metadata !6, metadata !"__cxx_global_var_init", metadata !"__cxx_global_var_init", metadata !"", i32 2, metadata !7, i1 true, i1 true, i32 0, i32 0, null, i32 256, i1 false, void ()* @__cxx_global_var_init, null, null, metadata !2, i32 2} ; [ DW_TAG_subprogram ] [line 2] [local] [def] [__cxx_global_var_init]
+!5 = metadata !{metadata !"global-ctor.ll", metadata !"/home/nlewycky"}
+!6 = metadata !{i32 786473, metadata !5}          ; [ DW_TAG_file_type ] [/home/nlewycky/global-ctor.ll]
+!7 = metadata !{i32 786453, i32 0, null, metadata !"", i32 0, i64 0, i64 0, i64 0, i32 0, null, metadata !2, i32 0, null, null, null} ; [ DW_TAG_subroutine_type ] [line 0, size 0, align 0, offset 0] [from ]
+!8 = metadata !{i32 786478, metadata !1, metadata !9, metadata !"", metadata !"", metadata !"_GLOBAL__sub_I_global-ctor.ll", i32 0, metadata !7, i1 true, i1 true, i32 0, i32 0, null, i32 64, i1 false, void ()* @_GLOBAL__sub_I_global-ctor.ll, null, null, metadata !2, i32 0} ; [ DW_TAG_subprogram ] [line 0] [local] [def]
+!9 = metadata !{i32 786473, metadata !1}          ; [ DW_TAG_file_type ] [/home/nlewycky/<stdin>]
+!10 = metadata !{i32 2, metadata !"Dwarf Version", i32 4}
+!11 = metadata !{i32 2, metadata !"Debug Info Version", i32 1}
+!12 = metadata !{metadata !"clang version 3.5.0 (trunk 210217)"}
+!13 = metadata !{i32 2, i32 0, metadata !4, null}
+!14 = metadata !{i32 0, i32 0, metadata !15, null}
+!15 = metadata !{i32 786443, metadata !5, metadata !8} ; [ DW_TAG_lexical_block ] [/home/nlewycky/global-ctor.ll]