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llvm-6502/test/DebugInfo/X86/generate-odr-hash.ll
David Blaikie f49ead7098 Provide gmlt-like inline scope information in the skeleton CU to facilitate symbolication without needing the .dwo files 
Clang -gsplit-dwarf self-host -O0, binary increases by 0.0005%, -O2,
binary increases by 25%.

A large binary inside Google, split-dwarf, -O0, and other internal flags
(GDB index, etc) increases by 1.8%, optimized build is 35%.

The size impact may be somewhat greater in .o files (I haven't measured
that much - since the linked executable -O0 numbers seemed low enough)
due to relocations. These relocations could be removed if we taught the
llvm-symbolizer to handle indexed addressing in the .o file (GDB can't
cope with this just yet, but GDB won't be reading this info anyway).
Also debug_ranges could be shared between .o and .dwo, though ideally
debug_ranges would get a schema that could used index(+offset)
addressing, and move to the .dwo file, then we'd be back to sharing
addresses in the address pool again.

But for now, these sizes seem small enough to go ahead with this.

Verified that no other DW_TAGs are produced into the .o file other than
subprograms and inlined_subroutines.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@221306 91177308-0d34-0410-b5e6-96231b3b80d8
2014-11-04 22:12:25 +00:00

278 lines
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LLVM
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; REQUIRES: object-emission
; RUN: llc < %s -o %t -filetype=obj -O0 -generate-type-units -mtriple=x86_64-unknown-linux-gnu
; RUN: llvm-dwarfdump %t | FileCheck --check-prefix=CHECK --check-prefix=SINGLE %s
; RUN: llvm-readobj -s -t %t | FileCheck --check-prefix=OBJ_SINGLE %s
; RUN: llc < %s -split-dwarf=Enable -o %t -filetype=obj -O0 -generate-type-units -mtriple=x86_64-unknown-linux-gnu
; RUN: llvm-dwarfdump %t | FileCheck --check-prefix=CHECK --check-prefix=FISSION %s
; RUN: llvm-readobj -s -t %t | FileCheck --check-prefix=OBJ_FISSION %s
; Generated from bar.cpp:
; #line 1 "bar.h"
; struct bar {};
; #line 2 "bar.cpp"
; struct bar b;
; void foo(void) {
; struct baz {};
; baz b;
; }
; namespace echidna {
; namespace capybara {
; namespace mongoose {
; class fluffy {
; int a;
; int b;
; };
; fluffy animal;
; }
; }
; }
; namespace {
; struct walrus {
; walrus() {}
; };
; }
; walrus w;
; struct wombat {
; struct {
; int a;
; int b;
; } a_b;
; };
; wombat wom;
; SINGLE-LABEL: .debug_info contents:
; FISSION-LABEL: .debug_info.dwo contents:
; CHECK: Compile Unit: length = [[CU_SIZE:[0-9a-f]+]]
; CHECK: [[BAR:^0x........]]: DW_TAG_structure_type
; CHECK-NEXT: DW_AT_declaration
; CHECK-NEXT: DW_AT_signature {{.*}} (0x1d02f3be30cc5688)
; CHECK: [[FLUFFY:^0x........]]: DW_TAG_class_type
; CHECK-NEXT: DW_AT_declaration
; CHECK-NEXT: DW_AT_signature {{.*}} (0xb04af47397402e77)
; Ensure the CU-local type 'walrus' is not placed in a type unit.
; CHECK: [[WALRUS:^0x........]]: DW_TAG_structure_type
; CHECK-NEXT: DW_AT_name{{.*}}"walrus"
; CHECK-NEXT: DW_AT_byte_size
; CHECK-NEXT: DW_AT_decl_file
; CHECK-NEXT: DW_AT_decl_line
; CHECK: [[WOMBAT:^0x........]]: DW_TAG_structure_type
; CHECK-NEXT: DW_AT_declaration
; CHECK-NEXT: DW_AT_signature {{.*}} (0xfd756cee88f8a118)
; SINGLE-LABEL: .debug_types contents:
; FISSION-NOT: .debug_types contents:
; FISSION-LABEL: .debug_types.dwo contents:
; Check that we generate a hash for bar and the value.
; CHECK-NOT: type_signature
; CHECK-LABEL: type_signature = 0x1d02f3be30cc5688
; CHECK: DW_TAG_structure_type
; FISSION-NEXT: DW_AT_name {{.*}} ( indexed {{.*}} "bar"
; SINGLE-NEXT: DW_AT_name {{.*}} "bar"
; Check that we generate a hash for fluffy and the value.
; CHECK-NOT: type_signature
; CHECK-LABEL: type_signature = 0xb04af47397402e77
; CHECK-NOT: DW_AT_GNU_odr_signature [DW_FORM_data8] (0x9a0124d5a0c21c52)
; CHECK: DW_TAG_namespace
; CHECK-NEXT: DW_AT_name{{.*}}"echidna"
; CHECK: DW_TAG_namespace
; CHECK-NEXT: DW_AT_name{{.*}}"capybara"
; CHECK: DW_TAG_namespace
; CHECK-NEXT: DW_AT_name{{.*}}"mongoose"
; CHECK: DW_TAG_class_type
; CHECK-NEXT: DW_AT_name{{.*}}"fluffy"
; Check that we generate a hash for wombat and the value, but not for the
; anonymous type contained within.
; CHECK-NOT: type_signature
; CHECK-LABEL: type_signature = 0xfd756cee88f8a118
; CHECK-NOT: DW_AT_GNU_odr_signature [DW_FORM_data8] (0x685bcc220141e9d7)
; CHECK: DW_TAG_structure_type
; CHECK-NEXT: DW_AT_name{{.*}}"wombat"
; CHECK-NOT: type_signature
; CHECK-LABEL: type_signature = 0xe94f6d3843e62d6b
; CHECK: DW_TAG_type_unit
; CHECK: DW_AT_stmt_list [DW_FORM_sec_offset] (0x00000000)
; CHECK-NOT: NULL
; CHECK-NOT: DW_AT_GNU_odr_signature
; CHECK: DW_TAG_structure_type
; The signature for the outer 'wombat' type
; CHECK: DW_AT_signature [DW_FORM_ref_sig8] (0xfd756cee88f8a118)
; CHECK: DW_TAG_structure_type
; CHECK-NOT: DW_AT_name
; CHECK-NOT: DW_AT_GNU_odr_signature
; CHECK: DW_TAG_member
; CHECK-NEXT: DW_AT_name{{.*}}"a"
; CHECK-LABEL: .debug_line contents:
; CHECK: Line table prologue
; CHECK-NOT: file_names[
; SINGLE: file_names{{.*}} bar.h
; CHECK: file_names{{.*}} bar.cpp
; CHECK-NOT: file_names[
; CHECK-LABEL: .debug_line.dwo contents:
; FISSION: Line table prologue
; FISSION: opcode_base: 1
; FISSION-NOT: standard_opcode_lengths
; FISSION-NOT: include_directories
; FISSION-NOT: file_names[
; FISSION: file_names{{.*}} bar.h
; FISSION: file_names{{.*}} bar.cpp
; FISSION-NOT: file_names[
; CHECK-LABEL: .debug_str contents:
; Use the unit size as a rough hash/identifier for the unit we're dealing with
; it happens to be unambiguous at the moment, but it's hardly ideal.
; CHECK-LABEL: .debug_pubtypes contents:
; Don't emit pubtype entries for type DIEs in the compile unit that just indirect to a type unit.
; CHECK-NEXT: unit_size = [[CU_SIZE]]
; CHECK-NEXT: Offset Name
; CHECK-DAG: [[BAR]] "bar"
; CHECK-DAG: [[WALRUS]] "(anonymous namespace)::walrus"
; CHECK-DAG: [[WOMBAT]] "wombat"
; CHECK-DAG: [[FLUFFY]] "echidna::capybara::mongoose::fluffy"
; Make sure debug_types are in comdat groups. This could be more rigid to check
; that they're the right comdat groups (each type in a separate comdat group,
; etc)
; OBJ_SINGLE: Name: .debug_types (
; OBJ_SINGLE-NOT: }
; OBJ_SINGLE: SHF_GROUP
; Fission type units don't go in comdat groups, since their linker is debug
; aware it's handled using the debug info semantics rather than raw ELF object
; semantics.
; OBJ_FISSION: Name: .debug_types.dwo (
; OBJ_FISSION-NOT: SHF_GROUP
; OBJ_FISSION: }
%struct.bar = type { i8 }
%"class.echidna::capybara::mongoose::fluffy" = type { i32, i32 }
%"struct.<anonymous namespace>::walrus" = type { i8 }
%struct.wombat = type { %struct.anon }
%struct.anon = type { i32, i32 }
%struct.baz = type { i8 }
@b = global %struct.bar zeroinitializer, align 1
@_ZN7echidna8capybara8mongoose6animalE = global %"class.echidna::capybara::mongoose::fluffy" zeroinitializer, align 4
@w = internal global %"struct.<anonymous namespace>::walrus" zeroinitializer, align 1
@wom = global %struct.wombat zeroinitializer, align 4
@llvm.global_ctors = appending global [1 x { i32, void ()* }] [{ i32, void ()* } { i32 65535, void ()* @_GLOBAL__I_a }]
; Function Attrs: nounwind uwtable
define void @_Z3foov() #0 {
entry:
%b = alloca %struct.baz, align 1
call void @llvm.dbg.declare(metadata !{%struct.baz* %b}, metadata !46, metadata !{metadata !"0x102"}), !dbg !48
ret void, !dbg !49
}
; Function Attrs: nounwind readnone
declare void @llvm.dbg.declare(metadata, metadata, metadata) #1
define internal void @__cxx_global_var_init() section ".text.startup" {
entry:
call void @_ZN12_GLOBAL__N_16walrusC2Ev(%"struct.<anonymous namespace>::walrus"* @w), !dbg !50
ret void, !dbg !50
}
; Function Attrs: nounwind uwtable
define internal void @_ZN12_GLOBAL__N_16walrusC2Ev(%"struct.<anonymous namespace>::walrus"* %this) unnamed_addr #0 align 2 {
entry:
%this.addr = alloca %"struct.<anonymous namespace>::walrus"*, align 8
store %"struct.<anonymous namespace>::walrus"* %this, %"struct.<anonymous namespace>::walrus"** %this.addr, align 8
call void @llvm.dbg.declare(metadata !{%"struct.<anonymous namespace>::walrus"** %this.addr}, metadata !51, metadata !{metadata !"0x102"}), !dbg !53
%this1 = load %"struct.<anonymous namespace>::walrus"** %this.addr
ret void, !dbg !54
}
define internal void @_GLOBAL__I_a() section ".text.startup" {
entry:
call void @__cxx_global_var_init(), !dbg !55
ret void, !dbg !55
}
attributes #0 = { nounwind 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" }
attributes #1 = { nounwind readnone }
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!43, !44}
!llvm.ident = !{!45}
!0 = metadata !{metadata !"0x11\004\00clang version 3.5 \000\00\000\00bar.dwo\000", metadata !1, metadata !2, metadata !3, metadata !21, metadata !38, metadata !2} ; [ DW_TAG_compile_unit ] [/tmp/dbginfo/bar.cpp] [DW_LANG_C_plus_plus]
!1 = metadata !{metadata !"bar.cpp", metadata !"/tmp/dbginfo"}
!2 = metadata !{}
!3 = metadata !{metadata !4, metadata !6, metadata !14, metadata !17}
!4 = metadata !{metadata !"0x13\00bar\001\008\008\000\000\000", metadata !5, null, null, metadata !2, null, null, metadata !"_ZTS3bar"} ; [ DW_TAG_structure_type ] [bar] [line 1, size 8, align 8, offset 0] [def] [from ]
!5 = metadata !{metadata !"bar.h", metadata !"/tmp/dbginfo"}
!6 = metadata !{metadata !"0x2\00fluffy\0013\0064\0032\000\000\000", metadata !1, metadata !7, null, metadata !10, null, null, metadata !"_ZTSN7echidna8capybara8mongoose6fluffyE"} ; [ DW_TAG_class_type ] [fluffy] [line 13, size 64, align 32, offset 0] [def] [from ]
!7 = metadata !{metadata !"0x39\00mongoose\0012", metadata !1, metadata !8} ; [ DW_TAG_namespace ] [mongoose] [line 12]
!8 = metadata !{metadata !"0x39\00capybara\0011", metadata !1, metadata !9} ; [ DW_TAG_namespace ] [capybara] [line 11]
!9 = metadata !{metadata !"0x39\00echidna\0010", metadata !1, null} ; [ DW_TAG_namespace ] [echidna] [line 10]
!10 = metadata !{metadata !11, metadata !13}
!11 = metadata !{metadata !"0xd\00a\0014\0032\0032\000\001", metadata !1, metadata !"_ZTSN7echidna8capybara8mongoose6fluffyE", metadata !12} ; [ DW_TAG_member ] [a] [line 14, size 32, align 32, offset 0] [private] [from int]
!12 = metadata !{metadata !"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]
!13 = metadata !{metadata !"0xd\00b\0015\0032\0032\0032\001", metadata !1, metadata !"_ZTSN7echidna8capybara8mongoose6fluffyE", metadata !12} ; [ DW_TAG_member ] [b] [line 15, size 32, align 32, offset 32] [private] [from int]
!14 = metadata !{metadata !"0x13\00wombat\0031\0064\0032\000\000\000", metadata !1, null, null, metadata !15, null, null, metadata !"_ZTS6wombat"} ; [ DW_TAG_structure_type ] [wombat] [line 31, size 64, align 32, offset 0] [def] [from ]
!15 = metadata !{metadata !16}
!16 = metadata !{metadata !"0xd\00a_b\0035\0064\0032\000\000", metadata !1, metadata !"_ZTS6wombat", metadata !"_ZTSN6wombatUt_E"} ; [ DW_TAG_member ] [a_b] [line 35, size 64, align 32, offset 0] [from _ZTSN6wombatUt_E]
!17 = metadata !{metadata !"0x13\00\0032\0064\0032\000\000\000", metadata !1, metadata !"_ZTS6wombat", null, metadata !18, null, null, metadata !"_ZTSN6wombatUt_E"} ; [ DW_TAG_structure_type ] [line 32, size 64, align 32, offset 0] [def] [from ]
!18 = metadata !{metadata !19, metadata !20}
!19 = metadata !{metadata !"0xd\00a\0033\0032\0032\000\000", metadata !1, metadata !"_ZTSN6wombatUt_E", metadata !12} ; [ DW_TAG_member ] [a] [line 33, size 32, align 32, offset 0] [from int]
!20 = metadata !{metadata !"0xd\00b\0034\0032\0032\0032\000", metadata !1, metadata !"_ZTSN6wombatUt_E", metadata !12} ; [ DW_TAG_member ] [b] [line 34, size 32, align 32, offset 32] [from int]
!21 = metadata !{metadata !22, metadata !26, metadata !27, metadata !36}
!22 = metadata !{metadata !"0x2e\00foo\00foo\00_Z3foov\005\000\001\000\006\00256\000\005", metadata !1, metadata !23, metadata !24, null, void ()* @_Z3foov, null, null, metadata !2} ; [ DW_TAG_subprogram ] [line 5] [def] [foo]
!23 = metadata !{metadata !"0x29", metadata !1} ; [ DW_TAG_file_type ] [/tmp/dbginfo/bar.cpp]
!24 = metadata !{metadata !"0x15\00\000\000\000\000\000\000", i32 0, null, null, metadata !25, null, null, null} ; [ DW_TAG_subroutine_type ] [line 0, size 0, align 0, offset 0] [from ]
!25 = metadata !{null}
!26 = metadata !{metadata !"0x2e\00__cxx_global_var_init\00__cxx_global_var_init\00\0029\001\001\000\006\00256\000\0029", metadata !1, metadata !23, metadata !24, null, void ()* @__cxx_global_var_init, null, null, metadata !2} ; [ DW_TAG_subprogram ] [line 29] [local] [def] [__cxx_global_var_init]
!27 = metadata !{metadata !"0x2e\00walrus\00walrus\00_ZN12_GLOBAL__N_16walrusC2Ev\0025\001\001\000\006\00256\000\0025", metadata !1, metadata !28, metadata !32, null, void (%"struct.<anonymous namespace>::walrus"*)* @_ZN12_GLOBAL__N_16walrusC2Ev, null, metadata !31, metadata !2} ; [ DW_TAG_subprogram ] [line 25] [local] [def] [walrus]
!28 = metadata !{metadata !"0x13\00walrus\0024\008\008\000\000\000", metadata !1, metadata !29, null, metadata !30, null, null, null} ; [ DW_TAG_structure_type ] [walrus] [line 24, size 8, align 8, offset 0] [def] [from ]
!29 = metadata !{metadata !"0x39\00\0023", metadata !1, null} ; [ DW_TAG_namespace ] [line 23]
!30 = metadata !{metadata !31}
!31 = metadata !{metadata !"0x2e\00walrus\00walrus\00\0025\000\000\000\006\00256\000\0025", metadata !1, metadata !28, metadata !32, null, null, null, i32 0, metadata !35} ; [ DW_TAG_subprogram ] [line 25] [walrus]
!32 = metadata !{metadata !"0x15\00\000\000\000\000\000\000", i32 0, null, null, metadata !33, null, null, null} ; [ DW_TAG_subroutine_type ] [line 0, size 0, align 0, offset 0] [from ]
!33 = metadata !{null, metadata !34}
!34 = metadata !{metadata !"0xf\00\000\0064\0064\000\001088", null, null, metadata !28} ; [ DW_TAG_pointer_type ] [line 0, size 64, align 64, offset 0] [artificial] [from walrus]
!35 = metadata !{i32 786468}
!36 = metadata !{metadata !"0x2e\00\00\00_GLOBAL__I_a\0025\001\001\000\006\0064\000\0025", metadata !1, metadata !23, metadata !37, null, void ()* @_GLOBAL__I_a, null, null, metadata !2} ; [ DW_TAG_subprogram ] [line 25] [local] [def]
!37 = metadata !{metadata !"0x15\00\000\000\000\000\000\000", i32 0, null, null, metadata !2, null, null, null} ; [ DW_TAG_subroutine_type ] [line 0, size 0, align 0, offset 0] [from ]
!38 = metadata !{metadata !39, metadata !40, metadata !41, metadata !42}
!39 = metadata !{metadata !"0x34\00b\00b\00\003\000\001", null, metadata !23, metadata !4, %struct.bar* @b, null} ; [ DW_TAG_variable ] [b] [line 3] [def]
!40 = metadata !{metadata !"0x34\00animal\00animal\00_ZN7echidna8capybara8mongoose6animalE\0018\000\001", metadata !7, metadata !23, metadata !6, %"class.echidna::capybara::mongoose::fluffy"* @_ZN7echidna8capybara8mongoose6animalE, null} ; [ DW_TAG_variable ] [animal] [line 18] [def]
!41 = metadata !{metadata !"0x34\00w\00w\00\0029\001\001", null, metadata !23, metadata !28, %"struct.<anonymous namespace>::walrus"* @w, null} ; [ DW_TAG_variable ] [w] [line 29] [local] [def]
!42 = metadata !{metadata !"0x34\00wom\00wom\00\0038\000\001", null, metadata !23, metadata !14, %struct.wombat* @wom, null} ; [ DW_TAG_variable ] [wom] [line 38] [def]
!43 = metadata !{i32 2, metadata !"Dwarf Version", i32 4}
!44 = metadata !{i32 1, metadata !"Debug Info Version", i32 2}
!45 = metadata !{metadata !"clang version 3.5 "}
!46 = metadata !{metadata !"0x100\00b\007\000", metadata !22, metadata !23, metadata !47} ; [ DW_TAG_auto_variable ] [b] [line 7]
!47 = metadata !{metadata !"0x13\00baz\006\008\008\000\000\000", metadata !1, metadata !22, null, metadata !2, null, null, null} ; [ DW_TAG_structure_type ] [baz] [line 6, size 8, align 8, offset 0] [def] [from ]
!48 = metadata !{i32 7, i32 0, metadata !22, null}
!49 = metadata !{i32 8, i32 0, metadata !22, null}
!50 = metadata !{i32 29, i32 0, metadata !26, null}
!51 = metadata !{metadata !"0x101\00this\0016777216\001088", metadata !27, null, metadata !52} ; [ DW_TAG_arg_variable ] [this] [line 0]
!52 = metadata !{metadata !"0xf\00\000\0064\0064\000\000", null, null, metadata !28} ; [ DW_TAG_pointer_type ] [line 0, size 64, align 64, offset 0] [from walrus]
!53 = metadata !{i32 0, i32 0, metadata !27, null}
!54 = metadata !{i32 25, i32 0, metadata !27, null}
!55 = metadata !{i32 25, i32 0, metadata !36, null}
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