llvm-dis: Stop crashing when dropping debug info

Since r199356, we've printed a warning when dropping debug info.
r225562 started crashing on that, since it registered a diagnostic
handler that only expected errors.  This fixes the handler to expect
other severities.  As a side effect, it now prints "error: " at the
start of error messages, similar to `llvm-as`.

There was a testcase for r199356, but it only really checked the
assembler.  Move `test/Bitcode/drop-debug-info.ll` to `test/Assembler`,
and introduce `test/Bitcode/drop-debug-info.3.5.ll` (and companion
`.bc`) to test the bitcode reader.

Note: tools/gold/gold-plugin.cpp has an equivalent bug, but I'm not sure
what the best fix is there.  I'll file a PR.

llvm-svn: 230416

5 files changed, 42 insertions, 31 deletions

diff --git a/llvm/test/Bitcode/drop-debug-info.3.5.ll b/llvm/test/Bitcode/drop-debug-info.3.5.ll
new file mode 100644
index 00000000000..fde136d1c3c
--- /dev/null
+++ b/llvm/test/Bitcode/drop-debug-info.3.5.ll
@@ -0,0 +1,40 @@
+; RUN: llvm-dis < %s.bc -o %t.ll 2>&1 | FileCheck -check-prefix=WARN %s
+; RUN: FileCheck -input-file=%t.ll %s
+
+; The bitcode paired with this test was generated by passing this file to
+; llvm-dis-3.5.  This tests that llvm-dis warns correctly when reading old
+; bitcode.
+
+; CHECK-NOT: !llvm.dbg.cu
+; CHECK-NOT: !dbg
+; WARN: warning: ignoring debug info with an invalid version (1)
+target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-apple-macosx10.10.0"
+
+; Function Attrs: nounwind ssp uwtable
+define i32 @main() #0 {
+entry:
+  %retval = alloca i32, align 4
+  store i32 0, i32* %retval
+  ret i32 0, !dbg !12
+}
+
+attributes #0 = { nounwind ssp uwtable "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
+
+!llvm.dbg.cu = !{!0}
+!llvm.module.flags = !{!9, !10}
+!llvm.ident = !{!11}
+
+!0 = metadata !{i32 786449, metadata !1, i32 12, metadata !"clang version 3.5.2 (230356)", i1 false, metadata !"", i32 0, metadata !2, metadata !2, metadata !3, metadata !2, metadata !2, metadata !"", i32 1} ; [ DW_TAG_compile_unit ] [/Users/dexonsmith/data/llvm/staging/test/Bitcode/t.c] [DW_LANG_C99]
+!1 = metadata !{metadata !"t.c", metadata !"/Users/dexonsmith/data/llvm/staging/test/Bitcode"}
+!2 = metadata !{}
+!3 = metadata !{metadata !4}
+!4 = metadata !{i32 786478, metadata !1, metadata !5, metadata !"main", metadata !"main", metadata !"", i32 1, metadata !6, i1 false, i1 true, i32 0, i32 0, null, i32 0, i1 false, i32 ()* @main, null, null, metadata !2, i32 1} ; [ DW_TAG_subprogram ] [line 1] [def] [main]
+!5 = metadata !{i32 786473, metadata !1}          ; [ DW_TAG_file_type ] [/Users/dexonsmith/data/llvm/staging/test/Bitcode/t.c]
+!6 = metadata !{i32 786453, i32 0, null, metadata !"", i32 0, i64 0, i64 0, i64 0, i32 0, null, metadata !7, i32 0, null, null, null} ; [ DW_TAG_subroutine_type ] [line 0, size 0, align 0, offset 0] [from ]
+!7 = metadata !{metadata !8}
+!8 = metadata !{i32 786468, null, null, metadata !"int", i32 0, i64 32, i64 32, i64 0, i32 0, i32 5} ; [ DW_TAG_base_type ] [int] [line 0, size 32, align 32, offset 0, enc DW_ATE_signed]
+!9 = metadata !{i32 2, metadata !"Dwarf Version", i32 2}
+!10 = metadata !{i32 2, metadata !"Debug Info Version", i32 1}
+!11 = metadata !{metadata !"clang version 3.5.2 (230356)"}
+!12 = metadata !{i32 1, i32 14, metadata !4, null}
diff --git a/llvm/test/Bitcode/drop-debug-info.3.5.ll.bc b/llvm/test/Bitcode/drop-debug-info.3.5.ll.bc
new file mode 100644
index 00000000000..c40198999b2
--- /dev/null
+++ b/llvm/test/Bitcode/drop-debug-info.3.5.ll.bc
diff --git a/llvm/test/Bitcode/drop-debug-info.ll b/llvm/test/Bitcode/drop-debug-info.ll
deleted file mode 100644
index 5109b5e4327..00000000000
--- a/llvm/test/Bitcode/drop-debug-info.ll
+++ /dev/null
@@ -1,29 +0,0 @@
-; RUN: llvm-as < %s -o %t.bc 2>&1 >/dev/null | FileCheck -check-prefix=WARN %s
-; RUN: llvm-dis < %t.bc | FileCheck %s
-; RUN: verify-uselistorder < %t.bc
-
-define i32 @main() {
-entry:
-  %retval = alloca i32, align 4
-  store i32 0, i32* %retval
-  ret i32 0, !dbg !12
-}
-
-!llvm.dbg.cu = !{!0}
-!llvm.module.flags = !{!9}
-
-!0 = !{!"0x11\0012\00clang version 3.5 (trunk 195495) (llvm/trunk 195495:195504M)\000\00\000\00\000", !1, !2, !2, !3, !2, !2} ; [ DW_TAG_compile_unit ] [/Users/manmanren/llvm_gmail/release/../llvm/tools/clang/test/CodeGen/debug-info-version.c] [DW_LANG_C99]
-!1 = !{!"../llvm/tools/clang/test/CodeGen/debug-info-version.c", !"/Users/manmanren/llvm_gmail/release"}
-!2 = !{i32 0}
-!3 = !{!4}
-!4 = !{!"0x2e\00main\00main\00\003\000\001\000\006\00256\000\003", !1, !5, !6, null, i32 ()* @main, null, null, !2} ; [ DW_TAG_subprogram ] [line 3] [def] [main]
-!5 = !{!"0x29", !1}          ; [ DW_TAG_file_type ] [/Users/manmanren/llvm_gmail/release/../llvm/tools/clang/test/CodeGen/debug-info-version.c]
-!6 = !{!"0x15\00\000\000\000\000\000\000", i32 0, null, null, !7, null, null, null} ; [ DW_TAG_subroutine_type ] [line 0, size 0, align 0, offset 0] [from ]
-!7 = !{!8}
-!8 = !{!"0x24\00int\000\0032\0032\000\000\005", null, null} ; [ DW_TAG_base_type ] [int] [line 0, size 32, align 32, offset 0, enc DW_ATE_signed]
-!9 = !{i32 2, !"Dwarf Version", i32 2}
-!12 = !MDLocation(line: 4, scope: !4)
-
-; WARN: warning: ignoring debug info with an invalid version (0)
-; CHECK-NOT: !dbg
-; CHECK-NOT: !llvm.dbg.cu
diff --git a/llvm/test/Bitcode/invalid.ll b/llvm/test/Bitcode/invalid.ll
index 8b532d8dadf..df9fec8772d 100644
--- a/llvm/test/Bitcode/invalid.ll
+++ b/llvm/test/Bitcode/invalid.ll
@@ -1,6 +1,6 @@
 ; RUN:  not llvm-dis < %s.bc 2>&1 | FileCheck %s
 
-; CHECK: llvm-dis{{(\.EXE|\.exe)?}}: Unknown attribute kind (48)
+; CHECK: llvm-dis{{(\.EXE|\.exe)?}}: error: Unknown attribute kind (48)
 
 ; invalid.ll.bc has an invalid attribute number.
 ; The test checks that LLVM reports the error and doesn't access freed memory
diff --git a/llvm/test/Bitcode/pr18704.ll b/llvm/test/Bitcode/pr18704.ll
index f05fe53259f..e57ce3cec4c 100644
--- a/llvm/test/Bitcode/pr18704.ll
+++ b/llvm/test/Bitcode/pr18704.ll
@@ -1,6 +1,6 @@
 ; RUN:  not llvm-dis < %s.bc 2>&1 | FileCheck %s
 
-; CHECK: llvm-dis{{(\.EXE|\.exe)?}}: Never resolved value found in function
+; CHECK: llvm-dis{{(\.EXE|\.exe)?}}: error: Never resolved value found in function
 
 ; pr18704.ll.bc has an instruction referring to invalid type.
 ; The test checks that LLVM reports the error and doesn't access freed memory