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llvm/test/Linker/subprogram-linkonce-weak.ll
Scott Linder 5e4b515c4b [DebugInfo] Support DWARF v5 source code embedding extension 
In DWARF v5 the Line Number Program Header is extensible, allowing values with
new content types. In this extension a content type is added,
DW_LNCT_LLVM_source, which contains the embedded source code of the file.

Add new optional attribute for !DIFile IR metadata called source which contains
source text. Use this to output the source to the DWARF line table of code
objects. Analogously extend METADATA_FILE in Bitcode and .file directive in ASM
to support optional source.

Teach llvm-dwarfdump and llvm-objdump about the new values. Update the output
format of llvm-dwarfdump to make room for the new attribute on file_names
entries, and support embedded sources for the -source option in llvm-objdump.

Differential Revision: https://reviews.llvm.org/D42765



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@325970 91177308-0d34-0410-b5e6-96231b3b80d8
2018-02-23 23:01:06 +00:00

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; RUN: llvm-link %s %S/Inputs/subprogram-linkonce-weak.ll -S -o %t1
; RUN: FileCheck %s -check-prefix=LW -check-prefix=CHECK <%t1
; RUN: llvm-link %S/Inputs/subprogram-linkonce-weak.ll %s -S -o %t2
; RUN: FileCheck %s -check-prefix=WL -check-prefix=CHECK <%t2
; REQUIRES: default_triple
; This testcase tests the following flow:
; - File A defines a linkonce version of @foo which has inlined into @bar.
; - File B defines a weak version of @foo (different definition).
; - Linkage rules state File B version of @foo wins.
; - @bar still has inlined debug info related to the linkonce @foo.
;
; This should fix PR22792, although the testcase was hand-written. There's a
; RUN line with a crasher for llc at the end with checks for the DWARF output.
; The LW prefix means linkonce (this file) first, then weak (the other file).
; The WL prefix means weak (the other file) first, then linkonce (this file).
; We'll see @bar before @foo if this file is first.
; LW: define i32 @bar({{.*}} !dbg ![[BARSP:[0-9]+]]
; LW: %sum = add i32 %a, %b, !dbg ![[FOOINBAR:[0-9]+]]
; LW: ret i32 %sum, !dbg ![[BARRET:[0-9]+]]
; LW: define weak i32 @foo({{.*}} !dbg ![[WEAKFOOSP:[0-9]+]]
; LW: %sum = call i32 @fastadd(i32 %a, i32 %b), !dbg ![[FOOCALL:[0-9]+]]
; LW: ret i32 %sum, !dbg ![[FOORET:[0-9]+]]
; We'll see @foo before @bar if this file is second.
; WL: define weak i32 @foo({{.*}} !dbg ![[WEAKFOOSP:[0-9]+]]
; WL: %sum = call i32 @fastadd(i32 %a, i32 %b), !dbg ![[FOOCALL:[0-9]+]]
; WL: ret i32 %sum, !dbg ![[FOORET:[0-9]+]]
; WL: define i32 @bar({{.*}} !dbg ![[BARSP:[0-9]+]]
; WL: %sum = add i32 %a, %b, !dbg ![[FOOINBAR:[0-9]+]]
; WL: ret i32 %sum, !dbg ![[BARRET:[0-9]+]]
define i32 @bar(i32 %a, i32 %b) !dbg !3 {
entry:
%sum = add i32 %a, %b, !dbg !DILocation(line: 2, scope: !4,
inlinedAt: !DILocation(line: 12, scope: !3))
ret i32 %sum, !dbg !DILocation(line: 13, scope: !3)
}
define linkonce i32 @foo(i32 %a, i32 %b) !dbg !4 {
entry:
%sum = add i32 %a, %b, !dbg !DILocation(line: 2, scope: !4)
ret i32 %sum, !dbg !DILocation(line: 3, scope: !4)
}
!llvm.module.flags = !{!0}
!0 = !{i32 2, !"Debug Info Version", i32 3}
; CHECK-LABEL: !llvm.dbg.cu =
; LW-SAME: !{![[LCU:[0-9]+]], ![[WCU:[0-9]+]]}
; WL-SAME: !{![[WCU:[0-9]+]], ![[LCU:[0-9]+]]}
!llvm.dbg.cu = !{!1}
; LW: ![[LCU]] = distinct !DICompileUnit(
; LW: ![[WCU]] = distinct !DICompileUnit(
; LW: ![[BARSP]] = distinct !DISubprogram(name: "bar",{{.*}} unit: ![[LCU]]
; LW: ![[FOOINBAR]] = !DILocation(line: 2, scope: ![[FOOSP:.*]], inlinedAt: ![[BARIA:[0-9]+]])
; LW: ![[FOOSP]] = distinct !DISubprogram(name: "foo",{{.*}} unit: ![[LCU]]
; LW: ![[BARIA]] = !DILocation(line: 12, scope: ![[BARSP]])
; LW: ![[BARRET]] = !DILocation(line: 13, scope: ![[BARSP]])
; LW: ![[WEAKFOOSP]] = distinct !DISubprogram(name: "foo",{{.*}} unit: ![[WCU]]
; LW: ![[FOOCALL]] = !DILocation(line: 52, scope: ![[WEAKFOOSP]])
; LW: ![[FOORET]] = !DILocation(line: 53, scope: ![[WEAKFOOSP]])
; Same as above, but reordered.
; WL: ![[WCU]] = distinct !DICompileUnit(
; WL: ![[LCU]] = distinct !DICompileUnit(
; WL: ![[WEAKFOOSP]] = distinct !DISubprogram(name: "foo",{{.*}} unit: ![[WCU]]
; WL: ![[FOOCALL]] = !DILocation(line: 52, scope: ![[WEAKFOOSP]])
; WL: ![[FOORET]] = !DILocation(line: 53, scope: ![[WEAKFOOSP]])
; WL: ![[BARSP]] = distinct !DISubprogram(name: "bar",{{.*}} unit: ![[LCU]]
; WL: ![[FOOINBAR]] = !DILocation(line: 2, scope: ![[FOOSP:.*]], inlinedAt: ![[BARIA:[0-9]+]])
; WL: ![[FOOSP]] = distinct !DISubprogram(name: "foo",{{.*}} unit: ![[LCU]]
; WL: ![[BARIA]] = !DILocation(line: 12, scope: ![[BARSP]])
; WL: ![[BARRET]] = !DILocation(line: 13, scope: ![[BARSP]])
!1 = distinct !DICompileUnit(language: DW_LANG_C99, file: !2, emissionKind: FullDebug)
!2 = !DIFile(filename: "bar.c", directory: "/path/to/dir")
!3 = distinct !DISubprogram(file: !2, scope: !2, line: 11, name: "bar", type: !5, unit: !1)
!4 = distinct !DISubprogram(file: !2, scope: !2, line: 1, name: "foo", type: !5, unit: !1)
!5 = !DISubroutineType(types: !{})
; Crasher for llc.
; REQUIRES: object-emission
; RUN: %llc_dwarf -filetype=obj -O0 %t1 -o %t1.o
; RUN: llvm-dwarfdump %t1.o --all | FileCheck %s -check-prefix=DWLW -check-prefix=DW
; RUN: %llc_dwarf -filetype=obj -O0 %t2 -o %t2.o
; RUN: llvm-dwarfdump %t2.o --all | FileCheck %s -check-prefix=DWWL -check-prefix=DW
; Check that the debug info for the discarded linkonce version of @foo doesn't
; reference any code, and that the other subprograms look correct.
; DW-LABEL: .debug_info contents:
; DWLW: DW_TAG_compile_unit
; DWLW: DW_AT_name {{.*}}"bar.c"
; DWLW: DW_TAG_subprogram
; DWLW-NOT: DW_AT_low_pc
; DWLW-NOT: DW_AT_high_pc
; DWLW: DW_AT_name {{.*}}foo
; DWLW: DW_AT_decl_file {{.*}}"/path/to/dir{{/|\\}}bar.c"
; DWLW: DW_AT_decl_line {{.*}}(1)
; DWLW: DW_TAG_subprogram
; DWLW: DW_AT_low_pc
; DWLW: DW_AT_high_pc
; DWLW: DW_AT_name {{.*}}bar
; DWLW: DW_AT_decl_file {{.*}}"/path/to/dir{{/|\\}}bar.c"
; DWLW: DW_AT_decl_line {{.*}}(11)
; DWLW: DW_TAG_inlined_subroutine
; DWLW: DW_AT_abstract_origin
; DWLW: DW_TAG_compile_unit
; DWLW: DW_AT_name {{.*}}"foo.c"
; DWLW: DW_TAG_subprogram
; DWLW: DW_AT_low_pc
; DWLW: DW_AT_high_pc
; DWLW: DW_AT_name {{.*}}foo
; DWLW: DW_AT_decl_file {{.*}}"/path/to/dir{{/|\\}}foo.c"
; DWLW: DW_AT_decl_line {{.*}}(51)
; The DWARF output is already symmetric (just reordered).
; DWWL: DW_TAG_compile_unit
; DWWL: DW_AT_name {{.*}}"foo.c"
; DWWL: DW_TAG_subprogram
; DWWL: DW_AT_low_pc
; DWWL: DW_AT_high_pc
; DWWL: DW_AT_name {{.*}}foo
; DWWL: DW_AT_decl_file {{.*}}"/path/to/dir{{/|\\}}foo.c"
; DWWL: DW_AT_decl_line {{.*}}(51)
; DWWL: DW_TAG_compile_unit
; DWWL: DW_AT_name {{.*}}"bar.c"
; DWWL: DW_TAG_subprogram
; DWWL-NOT: DW_AT_low_pc
; DWWL-NOT: DW_AT_high_pc
; DWWL: DW_AT_name {{.*}}foo
; DWWL: DW_AT_decl_file {{.*}}"/path/to/dir{{/|\\}}bar.c"
; DWWL: DW_AT_decl_line {{.*}}(1)
; DWWL: DW_TAG_subprogram
; DWWL: DW_AT_low_pc
; DWWL: DW_AT_high_pc
; DWWL: DW_AT_name {{.*}}bar
; DWWL: DW_AT_decl_file {{.*}}"/path/to/dir{{/|\\}}bar.c"
; DWWL: DW_AT_decl_line {{.*}}(11)
; DWWL: DW_TAG_inlined_subroutine
; DWWL: DW_AT_abstract_origin
; DW-LABEL: .debug_line contents:
; Check that we have the right things in the line table as well.
; DWLW-LABEL: file_names[ 1]:
; DWLW-NEXT: name: "bar.c"
; DWLW: 2 0 1 0 0 is_stmt prologue_end
; DWLW-LABEL: file_names[ 1]:
; DWLW-NEXT: name: "foo.c"
; DWLW: 52 0 1 0 0 is_stmt prologue_end
; DWLW-NOT: prologue_end
; DWWL-LABEL: file_names[ 1]:
; DWWL-NEXT: name: "foo.c"
; DWWL: 52 0 1 0 0 is_stmt prologue_end
; DWWL-LABEL: file_names[ 1]:
; DWWL-NEXT: name: "bar.c"
; DWWL: 2 0 1 0 0 is_stmt prologue_end
; DWWL-NOT: prologue_end
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