[DWARF] Recommitting a test that was removed with r323564. Restricted…

… to x86 linux target.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@323804 91177308-0d34-0410-b5e6-96231b3b80d8

test/DebugInfo/X86/string-offsets-table.ll

@@ -0,0 +1,123 @@
+; REQUIRES: object-emission
+; RUN: llc -mtriple=x86_64-unknown-linux-gnu -filetype=obj < %s | llvm-dwarfdump -v - \
+; RUN:   | FileCheck --check-prefix=MONOLITHIC %s
+; RUN: llc -mtriple=x86_64-unknown-linux-gnu -split-dwarf-file=%t.dwo -filetype=obj < %s \
+; RUN:   | llvm-dwarfdump -v - | FileCheck --check-prefix=SPLIT %s
+
+; This basic test checks the emission of a DWARF v5 string offsets table in
+; the split and non-split (monolithic) scenario.
+;
+; Constructed from the following source with
+; clang -S -emit-llvm -gdwarf-5
+;
+; enum E {a, b, c};
+; E glob;
+;
+; In the non-split scenario, check the DW_AT_str_offsets_base attribute
+; in .debug_abbrev.
+; MONOLITHIC:          .debug_abbrev contents:
+; MONOLITHIC-NOT:      contents:
+; MONOLITHIC:          DW_TAG_compile_unit
+; MONOLITHIC-NOT:      DW_TAG
+; MONOLITHIC:          DW_AT_str_offsets_base DW_FORM_sec_offset
+
+; Check that indexed strings come out correctly and that the DW_str_offsets_base attribute
+; is there and has the right value.
+; MONOLITHIC:          .debug_info contents:
+; MONOLITHIC-NOT:      contents:
+; MONOLITHIC:          DW_TAG_compile_unit
+; MONOLITHIC-NOT:      {{DW_TAG|NULL}}
+; MONOLITHIC:          DW_AT_producer [DW_FORM_strx1] ( indexed (00000000) string = "clang{{.*}}")
+; MONOLITHIC-NOT:      {{DW_TAG|NULL}}
+; MONOLITHIC:          DW_AT_str_offsets_base [DW_FORM_sec_offset] (0x00000008)
+; MONOLITHIC-NOT:      {{DW_TAG|NULL}}
+; MONOLITHIC:          DW_AT_comp_dir [DW_FORM_strx1] ( indexed (00000002) string = "/home/{{.*}}")
+
+; Extract the string offsets from the .debug_str section so we can check that 
+; they are referenced correctly in the .debug_str_offsets section.
+; MONOLITHIC:          .debug_str contents:
+; MONOLITHIC-NEXT:     0x00000000:
+; MONOLITHIC-NEXT:     0x[[STRING2:[0-9a-f]]]
+; MONOLITHIC-NEXT:     0x[[STRING3:[0-9a-f]]]
+; MONOLITHIC-NEXT:     0x[[STRING4:[0-9a-f]]]
+
+; Verify that the .debug_str_offsets section is there and that it starts
+; with an 8-byte header, followed by offsets into the .debug_str section.
+; MONOLITHIC:          .debug_str_offsets contents:
+; MONOLITHIC-NEXT:     Contribution size = 32, Format = DWARF32, Version = 5
+; MONOLITHIC-NEXT:     0x00000008: 00000000
+; MONOLITHIC-NEXT:     0x0000000c: [[STRING2]]
+; MONOLITHIC-NEXT:     0x00000010: [[STRING3]]
+; MONOLITHIC-NEXT:     0x00000014: [[STRING4]]
+
+; For split dwarf, verify that the skeleton unit has the DW_AT_str_offsets_base
+; attribute and that it has the right value.
+;
+; SPLIT:      .debug_info contents:
+; SPLIT-NEXT: 0x00000000: Compile Unit:{{.*}}DW_UT_skeleton
+; SPLIT-NOT:  contents:
+; SPLIT:      DW_TAG_compile_unit
+; SPLIT-NOT:  {{DW_TAG|contents:}}
+; SPLIT:      DW_AT_str_offsets_base [DW_FORM_sec_offset] (0x00000008)
+
+; Check for the split CU in .debug_info.dwo.
+; SPLIT:      .debug_info.dwo contents:
+; SPLIT-NEXT: 0x00000000: Compile Unit:{{.*}}DW_UT_split_compile
+; SPLIT-NOT:  contents:
+; SPLIT:      DW_TAG_compile_unit
+;
+; Check that a couple of indexed strings are displayed correctly and that
+; they have the right format (DW_FORM_strx1).
+; SPLIT-NOT:  contents:
+; SPLIT:      DW_TAG_enumerator
+; SPLIT-NOT:  {{DW_TAG|NULL}}
+; SPLIT:      DW_AT_name [DW_FORM_strx1]    ( indexed (00000004) string = "a")
+; SPLIT-NOT:  contents:
+; SPLIT:      DW_TAG_enumerator
+; SPLIT-NOT:  {{DW_TAG|NULL}}
+; SPLIT:      DW_AT_name [DW_FORM_strx1]    ( indexed (00000005) string = "b")
+;
+; Extract the string offsets referenced in the main file by the skeleton unit.
+; SPLIT:      .debug_str contents:
+; SPLIT-NEXT: 0x00000000:{{.*}}
+; SPLIT-NEXT: 0x[[STRING2SPLIT:[0-9a-f]*]]{{.*}}
+;
+; Extract the string offsets referenced in the .dwo file by the split unit.
+; SPLIT:      .debug_str.dwo contents:
+; SPLIT-NEXT: 0x00000000:{{.*}}
+; SPLIT-NEXT: 0x[[STRING2DWO:[0-9a-f]*]]{{.*}}
+; SPLIT-NEXT: 0x[[STRING3DWO:[0-9a-f]*]]{{.*}}
+;
+; Check the string offsets sections in both the main and the .dwo files and
+; verify that the extracted string offsets are referenced correctly.
+; SPLIT:      .debug_str_offsets contents:
+; SPLIT-NEXT: 0x00000000: Contribution size = 8, Format = DWARF32, Version = 5
+; SPLIT-NEXT: 0x00000008: 00000000{{.*}}
+; SPLIT-NEXT: 0x0000000c: [[STRING2SPLIT]]
+; SPLIT:      .debug_str_offsets.dwo contents:
+; SPLIT-NEXT: 0x00000000: Contribution size = 32, Format = DWARF32, Version = 5
+; SPLIT-NEXT: 0x00000008: 00000000{{.*}}
+; SPLIT-NEXT: 0x0000000c: [[STRING2DWO]]{{.*}}
+; SPLIT-NEXT: 0x00000010: [[STRING3DWO]]
+
+@glob = global i32 0, align 4, !dbg !0
+
+!llvm.dbg.cu = !{!2}
+!llvm.module.flags = !{!11, !12, !13}
+!llvm.ident = !{!14}
+
+!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
+!1 = distinct !DIGlobalVariable(name: "glob", scope: !2, file: !3, line: 3, type: !5, isLocal: false, isDefinition: true)
+!2 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !3, producer: "clang version 7.0.0 (trunk 322415)", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !10)
+!3 = !DIFile(filename: "en.cpp", directory: "/home/test", checksumkind: CSK_MD5, checksum: "d96b2e2d618e550f0ddd0b6a49c98b02")
+!4 = !{!5}
+!5 = !DICompositeType(tag: DW_TAG_enumeration_type, name: "E", file: !3, line: 1, size: 32, elements: !6, identifier: "_ZTS1E")
+!6 = !{!7, !8, !9}
+!7 = !DIEnumerator(name: "a", value: 0)
+!8 = !DIEnumerator(name: "b", value: 1)
+!9 = !DIEnumerator(name: "c", value: 2)
+!10 = !{!0}
+!11 = !{i32 2, !"Dwarf Version", i32 5}
+!12 = !{i32 2, !"Debug Info Version", i32 3}
+!13 = !{i32 1, !"wchar_size", i32 4}
+!14 = !{!"clang version 7.0.0 (trunk 322415)"}