llvm/test/Feature/md_on_instruction.ll
Duncan P. N. Exon Smith 83902832de Revert "Revert "DI: Fold constant arguments into a single MDString""
This reverts commit r218918, effectively reapplying r218914 after fixing
an Ocaml bindings test and an Asan crash.  The root cause of the latter
was a tightened-up check in `DILexicalBlock::Verify()`, so I'll file a
PR to investigate who requires the loose check (and why).

Original commit message follows.

--

This patch addresses the first stage of PR17891 by folding constant
arguments together into a single MDString.  Integers are stringified and
a `\0` character is used as a separator.

Part of PR17891.

Note: I've attached my testcases upgrade scripts to the PR.  If I've
just broken your out-of-tree testcases, they might help.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@219010 91177308-0d34-0410-b5e6-96231b3b80d8
2014-10-03 20:01:09 +00:00

28 lines
1.2 KiB
LLVM

; RUN: llvm-as < %s | llvm-dis | grep " !dbg " | count 4
define i32 @foo() nounwind ssp {
entry:
%retval = alloca i32 ; <i32*> [#uses=2]
call void @llvm.dbg.func.start(metadata !0)
store i32 42, i32* %retval, !dbg !3
br label %0, !dbg !3
; <label>:0 ; preds = %entry
call void @llvm.dbg.region.end(metadata !0)
%1 = load i32* %retval, !dbg !3 ; <i32> [#uses=1]
ret i32 %1, !dbg !3
}
declare void @llvm.dbg.func.start(metadata) nounwind readnone
declare void @llvm.dbg.region.end(metadata) nounwind readnone
!llvm.module.flags = !{!6}
!0 = metadata !{metadata !"0x2e\00foo\00foo\00foo\001\000\001\000\006\000\000\000", i32 0, metadata !1, metadata !2, null, null, null, null} ; [ DW_TAG_subprogram ]
!1 = metadata !{metadata !"0x11\0012\00clang 1.0\001\00\000\00\000", metadata !4, metadata !5, metadata !5, metadata !4, null, null} ; [ DW_TAG_compile_unit ]
!2 = metadata !{metadata !"0x24\00int\000\0032\0032\000\000\005", null, metadata !1} ; [ DW_TAG_base_type ]
!3 = metadata !{i32 1, i32 13, metadata !1, metadata !1}
!4 = metadata !{metadata !"foo.c", metadata !"/tmp"}
!5 = metadata !{i32 0}
!6 = metadata !{i32 1, metadata !"Debug Info Version", i32 2}