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llvm-mirror/test/DebugInfo/X86/split-dwarf-cross-unit-reference.ll
Daniel Neilson f59acc15ad Remove alignment argument from memcpy/memmove/memset in favour of alignment attributes (Step 1) 
Summary:
 This is a resurrection of work first proposed and discussed in Aug 2015:
   http://lists.llvm.org/pipermail/llvm-dev/2015-August/089384.html
and initially landed (but then backed out) in Nov 2015:
   http://lists.llvm.org/pipermail/llvm-commits/Week-of-Mon-20151109/312083.html

 The @llvm.memcpy/memmove/memset intrinsics currently have an explicit argument
which is required to be a constant integer. It represents the alignment of the
dest (and source), and so must be the minimum of the actual alignment of the
two.

 This change is the first in a series that allows source and dest to each
have their own alignments by using the alignment attribute on their arguments.

 In this change we:
1) Remove the alignment argument.
2) Add alignment attributes to the source & dest arguments. We, temporarily,
   require that the alignments for source & dest be equal.

 For example, code which used to read:
  call void @llvm.memcpy.p0i8.p0i8.i32(i8* %dest, i8* %src, i32 100, i32 4, i1 false)
will now read
  call void @llvm.memcpy.p0i8.p0i8.i32(i8* align 4 %dest, i8* align 4 %src, i32 100, i1 false)

 Downstream users may have to update their lit tests that check for
@llvm.memcpy/memmove/memset call/declaration patterns. The following extended sed script
may help with updating the majority of your tests, but it does not catch all possible
patterns so some manual checking and updating will be required.

s~declare void @llvm\.mem(set|cpy|move)\.p([^(]*)\((.*), i32, i1\)~declare void @llvm.mem\1.p\2(\3, i1)~g
s~call void @llvm\.memset\.p([^(]*)i8\(i8([^*]*)\* (.*), i8 (.*), i8 (.*), i32 [01], i1 ([^)]*)\)~call void @llvm.memset.p\1i8(i8\2* \3, i8 \4, i8 \5, i1 \6)~g
s~call void @llvm\.memset\.p([^(]*)i16\(i8([^*]*)\* (.*), i8 (.*), i16 (.*), i32 [01], i1 ([^)]*)\)~call void @llvm.memset.p\1i16(i8\2* \3, i8 \4, i16 \5, i1 \6)~g
s~call void @llvm\.memset\.p([^(]*)i32\(i8([^*]*)\* (.*), i8 (.*), i32 (.*), i32 [01], i1 ([^)]*)\)~call void @llvm.memset.p\1i32(i8\2* \3, i8 \4, i32 \5, i1 \6)~g
s~call void @llvm\.memset\.p([^(]*)i64\(i8([^*]*)\* (.*), i8 (.*), i64 (.*), i32 [01], i1 ([^)]*)\)~call void @llvm.memset.p\1i64(i8\2* \3, i8 \4, i64 \5, i1 \6)~g
s~call void @llvm\.memset\.p([^(]*)i128\(i8([^*]*)\* (.*), i8 (.*), i128 (.*), i32 [01], i1 ([^)]*)\)~call void @llvm.memset.p\1i128(i8\2* \3, i8 \4, i128 \5, i1 \6)~g
s~call void @llvm\.memset\.p([^(]*)i8\(i8([^*]*)\* (.*), i8 (.*), i8 (.*), i32 ([0-9]*), i1 ([^)]*)\)~call void @llvm.memset.p\1i8(i8\2* align \6 \3, i8 \4, i8 \5, i1 \7)~g
s~call void @llvm\.memset\.p([^(]*)i16\(i8([^*]*)\* (.*), i8 (.*), i16 (.*), i32 ([0-9]*), i1 ([^)]*)\)~call void @llvm.memset.p\1i16(i8\2* align \6 \3, i8 \4, i16 \5, i1 \7)~g
s~call void @llvm\.memset\.p([^(]*)i32\(i8([^*]*)\* (.*), i8 (.*), i32 (.*), i32 ([0-9]*), i1 ([^)]*)\)~call void @llvm.memset.p\1i32(i8\2* align \6 \3, i8 \4, i32 \5, i1 \7)~g
s~call void @llvm\.memset\.p([^(]*)i64\(i8([^*]*)\* (.*), i8 (.*), i64 (.*), i32 ([0-9]*), i1 ([^)]*)\)~call void @llvm.memset.p\1i64(i8\2* align \6 \3, i8 \4, i64 \5, i1 \7)~g
s~call void @llvm\.memset\.p([^(]*)i128\(i8([^*]*)\* (.*), i8 (.*), i128 (.*), i32 ([0-9]*), i1 ([^)]*)\)~call void @llvm.memset.p\1i128(i8\2* align \6 \3, i8 \4, i128 \5, i1 \7)~g
s~call void @llvm\.mem(cpy|move)\.p([^(]*)i8\(i8([^*]*)\* (.*), i8([^*]*)\* (.*), i8 (.*), i32 [01], i1 ([^)]*)\)~call void @llvm.mem\1.p\2i8(i8\3* \4, i8\5* \6, i8 \7, i1 \8)~g
s~call void @llvm\.mem(cpy|move)\.p([^(]*)i16\(i8([^*]*)\* (.*), i8([^*]*)\* (.*), i16 (.*), i32 [01], i1 ([^)]*)\)~call void @llvm.mem\1.p\2i16(i8\3* \4, i8\5* \6, i16 \7, i1 \8)~g
s~call void @llvm\.mem(cpy|move)\.p([^(]*)i32\(i8([^*]*)\* (.*), i8([^*]*)\* (.*), i32 (.*), i32 [01], i1 ([^)]*)\)~call void @llvm.mem\1.p\2i32(i8\3* \4, i8\5* \6, i32 \7, i1 \8)~g
s~call void @llvm\.mem(cpy|move)\.p([^(]*)i64\(i8([^*]*)\* (.*), i8([^*]*)\* (.*), i64 (.*), i32 [01], i1 ([^)]*)\)~call void @llvm.mem\1.p\2i64(i8\3* \4, i8\5* \6, i64 \7, i1 \8)~g
s~call void @llvm\.mem(cpy|move)\.p([^(]*)i128\(i8([^*]*)\* (.*), i8([^*]*)\* (.*), i128 (.*), i32 [01], i1 ([^)]*)\)~call void @llvm.mem\1.p\2i128(i8\3* \4, i8\5* \6, i128 \7, i1 \8)~g
s~call void @llvm\.mem(cpy|move)\.p([^(]*)i8\(i8([^*]*)\* (.*), i8([^*]*)\* (.*), i8 (.*), i32 ([0-9]*), i1 ([^)]*)\)~call void @llvm.mem\1.p\2i8(i8\3* align \8 \4, i8\5* align \8 \6, i8 \7, i1 \9)~g
s~call void @llvm\.mem(cpy|move)\.p([^(]*)i16\(i8([^*]*)\* (.*), i8([^*]*)\* (.*), i16 (.*), i32 ([0-9]*), i1 ([^)]*)\)~call void @llvm.mem\1.p\2i16(i8\3* align \8 \4, i8\5* align \8 \6, i16 \7, i1 \9)~g
s~call void @llvm\.mem(cpy|move)\.p([^(]*)i32\(i8([^*]*)\* (.*), i8([^*]*)\* (.*), i32 (.*), i32 ([0-9]*), i1 ([^)]*)\)~call void @llvm.mem\1.p\2i32(i8\3* align \8 \4, i8\5* align \8 \6, i32 \7, i1 \9)~g
s~call void @llvm\.mem(cpy|move)\.p([^(]*)i64\(i8([^*]*)\* (.*), i8([^*]*)\* (.*), i64 (.*), i32 ([0-9]*), i1 ([^)]*)\)~call void @llvm.mem\1.p\2i64(i8\3* align \8 \4, i8\5* align \8 \6, i64 \7, i1 \9)~g
s~call void @llvm\.mem(cpy|move)\.p([^(]*)i128\(i8([^*]*)\* (.*), i8([^*]*)\* (.*), i128 (.*), i32 ([0-9]*), i1 ([^)]*)\)~call void @llvm.mem\1.p\2i128(i8\3* align \8 \4, i8\5* align \8 \6, i128 \7, i1 \9)~g

 The remaining changes in the series will:
Step 2) Expand the IRBuilder API to allow creation of memcpy/memmove with differing
   source and dest alignments.
Step 3) Update Clang to use the new IRBuilder API.
Step 4) Update Polly to use the new IRBuilder API.
Step 5) Update LLVM passes that create memcpy/memmove calls to use the new IRBuilder API,
        and those that use use MemIntrinsicInst::[get|set]Alignment() to use
        getDestAlignment() and getSourceAlignment() instead.
Step 6) Remove the single-alignment IRBuilder API for memcpy/memmove, and the
        MemIntrinsicInst::[get|set]Alignment() methods.

Reviewers: pete, hfinkel, lhames, reames, bollu

Reviewed By: reames

Subscribers: niosHD, reames, jholewinski, qcolombet, jfb, sanjoy, arsenm, dschuff, dylanmckay, mehdi_amini, sdardis, nemanjai, david2050, nhaehnle, javed.absar, sbc100, jgravelle-google, eraman, aheejin, kbarton, JDevlieghere, asb, rbar, johnrusso, simoncook, jordy.potman.lists, apazos, sabuasal, llvm-commits

Differential Revision: https://reviews.llvm.org/D41675

llvm-svn: 322965
2018-01-19 17:13:12 +00:00

196 lines
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; RUN: llc -mtriple=x86_64-linux -split-dwarf-cross-cu-references -split-dwarf-file=foo.dwo -filetype=obj -o %t < %s
; RUN: llvm-objdump -r %t | FileCheck %s
; RUN: llvm-dwarfdump -v -debug-info %t | FileCheck --check-prefix=ALL --check-prefix=INFO --check-prefix=DWO --check-prefix=CROSS %s
; RUN: llvm-dwarfdump -v -debug-info %t | FileCheck --check-prefix=ALL --check-prefix=INFO %s
; RUN: llc -mtriple=x86_64-linux -split-dwarf-file=foo.dwo -filetype=obj -o %t < %s
; RUN: llvm-objdump -r %t | FileCheck %s
; RUN: llvm-dwarfdump -v -debug-info %t | FileCheck --check-prefix=ALL --check-prefix=DWO --check-prefix=NOCROSS %s
; RUN: llvm-dwarfdump -v -debug-info %t | FileCheck --check-prefix=ALL --check-prefix=INFO %s
; Testing cross-CU references for types, subprograms, and variables
; Built from code something like this:
; foo.cpp:
; struct t1 { int i; };
; void f();
; __attribute__((always_inline)) void f1(t1 t) {
; f();
; }
; void foo(t1 t) {
; f1(t);
; }
; bar.cpp:
; struct t1 { int i; };
; void f1(t1);
; void bar(t1 t) {
; f1(t);
; }
; $ clang++-tot -emit-llvm -S {foo,bar}.cpp -g
; $ llvm-link-tot {foo,bar}.ll -S -o foobar.ll
; $ clang++-tot -emit-llvm foobar.ll -o foobar.opt.ll -S -c
;
; Then manually removing the original f1 definition, to simplify the DWARF a bit
; (so it only has the inlined definitions, no concrete definition)
; Check that:
; * no relocations are emitted for the debug_info.dwo section no matter what
; * one debug_info->debug_info relocation in debug_info no matter what (for
; split dwarf inlining)
; * debug_info uses relocations and ref_addr no matter what
; * debug_info.dwo uses relocations for types as well as abstract subprograms
; and variables when -split-dwarf-cross-cu-references is used
; * debug_info.dwo contains duplicate types, abstract subprograms and abstract
; variables otherwise to avoid the need for cross-cu references
; DWO: .debug_info.dwo contents:
; CHECK-NOT: .rel{{a?}}.debug_info.dwo
; CHECK: RELOCATION RECORDS FOR [.rel{{a?}}.debug_info]:
; CHECK-NOT: RELOCATION RECORDS
; Expect one relocation in debug_info, from the inlined f1 in foo to its
; abstract origin in bar
; CHECK: R_X86_64_32 .debug_info
; CHECK-NOT: RELOCATION RECORDS
; CHECK-NOT: .debug_info
; CHECK: RELOCATION RECORDS
; CHECK-NOT: .rel{{a?}}.debug_info.dwo
; ALL: Compile Unit
; ALL: DW_TAG_compile_unit
; DWO: DW_AT_name {{.*}} "foo.cpp"
; ALL: 0x[[F1:.*]]: DW_TAG_subprogram
; ALL: DW_AT_name {{.*}} "f1"
; DWO: 0x[[F1T:.*]]: DW_TAG_formal_parameter
; DWO: DW_AT_name {{.*}} "t"
; DWO: DW_AT_type [DW_FORM_ref4] {{.*}}{0x[[T1:.*]]}
; DWO: NULL
; DWO: 0x[[T1]]: DW_TAG_structure_type
; DWO: DW_AT_name {{.*}} "t1"
; ALL: DW_TAG_subprogram
; ALL: DW_AT_name {{.*}} "foo"
; DWO: DW_TAG_formal_parameter
; DWO: DW_AT_name {{.*}} "t"
; DWO: DW_AT_type [DW_FORM_ref4] {{.*}}{0x[[T1]]}
; ALL: DW_TAG_inlined_subroutine
; ALL: DW_AT_abstract_origin [DW_FORM_ref4] {{.*}}{0x[[F1]]}
; DWO: DW_TAG_formal_parameter
; DWO: DW_AT_abstract_origin [DW_FORM_ref4] {{.*}}{0x[[F1T]]}
; ALL: Compile Unit
; ALL: DW_TAG_compile_unit
; DWO: DW_AT_name {{.*}} "bar.cpp"
; NOCROSS: 0x[[BAR_F1:.*]]: DW_TAG_subprogram
; NOCROSS: DW_AT_name {{.*}} "f1"
; NOCROSS: 0x[[BAR_F1T:.*]]: DW_TAG_formal_parameter
; NOCROSS: DW_AT_name {{.*}} "t"
; NOCROSS: DW_AT_type [DW_FORM_ref4] {{.*}}{0x[[BAR_T1:.*]]}
; NOCROSS: NULL
; NOCROSS: 0x[[BAR_T1]]: DW_TAG_structure_type
; NOCROSS: DW_AT_name {{.*}} "t1"
; ALL: DW_TAG_subprogram
; ALL: DW_AT_name {{.*}} "bar"
; DWO: DW_TAG_formal_parameter
; DWO: DW_AT_name {{.*}} "t"
; CROSS: DW_AT_type [DW_FORM_ref_addr] (0x00000000[[T1]]
; NOCROSS: DW_AT_type [DW_FORM_ref4] {{.*}}{0x[[BAR_T1]]}
; ALL: DW_TAG_inlined_subroutine
; INFO: DW_AT_abstract_origin [DW_FORM_ref_addr] (0x00000000[[F1]]
; NOCROSS: DW_AT_abstract_origin [DW_FORM_ref4] {{.*}}{0x[[BAR_F1]]}
; DWO: DW_TAG_formal_parameter
; CROSS: DW_AT_abstract_origin [DW_FORM_ref_addr] (0x00000000[[F1T]]
; NOCROSS: DW_AT_abstract_origin [DW_FORM_ref4] {{.*}}{0x[[BAR_F1T]]
%struct.t1 = type { i32 }
; Function Attrs: nounwind readnone speculatable
declare void @llvm.dbg.declare(metadata, metadata, metadata) #1
declare void @_Z1fv() #2
; Function Attrs: noinline uwtable
define void @_Z3foo2t1(i32 %t.coerce) #3 !dbg !20 {
entry:
%t.i = alloca %struct.t1, align 4
call void @llvm.dbg.declare(metadata %struct.t1* %t.i, metadata !15, metadata !16), !dbg !21
%t = alloca %struct.t1, align 4
%agg.tmp = alloca %struct.t1, align 4
%coerce.dive = getelementptr inbounds %struct.t1, %struct.t1* %t, i32 0, i32 0
store i32 %t.coerce, i32* %coerce.dive, align 4
call void @llvm.dbg.declare(metadata %struct.t1* %t, metadata !23, metadata !16), !dbg !24
%0 = bitcast %struct.t1* %agg.tmp to i8*, !dbg !25
%1 = bitcast %struct.t1* %t to i8*, !dbg !25
call void @llvm.memcpy.p0i8.p0i8.i64(i8* align 4 %0, i8* align 4 %1, i64 4, i1 false), !dbg !25
%coerce.dive1 = getelementptr inbounds %struct.t1, %struct.t1* %agg.tmp, i32 0, i32 0, !dbg !26
%2 = load i32, i32* %coerce.dive1, align 4, !dbg !26
%coerce.dive.i = getelementptr inbounds %struct.t1, %struct.t1* %t.i, i32 0, i32 0
store i32 %2, i32* %coerce.dive.i, align 4
call void @_Z1fv(), !dbg !27
ret void, !dbg !28
}
; Function Attrs: argmemonly nounwind
declare void @llvm.memcpy.p0i8.p0i8.i64(i8* nocapture writeonly, i8* nocapture readonly, i64, i1) #4
; Function Attrs: noinline uwtable
define void @_Z3bar2t1(i32 %t.coerce) #3 !dbg !29 {
entry:
%t.i = alloca %struct.t1, align 4
call void @llvm.dbg.declare(metadata %struct.t1* %t.i, metadata !15, metadata !16), !dbg !30
%t = alloca %struct.t1, align 4
%agg.tmp = alloca %struct.t1, align 4
%coerce.dive = getelementptr inbounds %struct.t1, %struct.t1* %t, i32 0, i32 0
store i32 %t.coerce, i32* %coerce.dive, align 4
call void @llvm.dbg.declare(metadata %struct.t1* %t, metadata !32, metadata !16), !dbg !33
%0 = bitcast %struct.t1* %agg.tmp to i8*, !dbg !34
%1 = bitcast %struct.t1* %t to i8*, !dbg !34
call void @llvm.memcpy.p0i8.p0i8.i64(i8* align 4 %0, i8* align 4 %1, i64 4, i1 false), !dbg !34
%coerce.dive1 = getelementptr inbounds %struct.t1, %struct.t1* %agg.tmp, i32 0, i32 0, !dbg !35
%2 = load i32, i32* %coerce.dive1, align 4, !dbg !35
%coerce.dive.i = getelementptr inbounds %struct.t1, %struct.t1* %t.i, i32 0, i32 0
store i32 %2, i32* %coerce.dive.i, align 4
call void @_Z1fv(), !dbg !36
ret void, !dbg !37
}
!llvm.dbg.cu = !{!0, !3}
!llvm.ident = !{!5, !5}
!llvm.module.flags = !{!6, !7}
!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "clang version 5.0.0 (trunk 302809) (llvm/trunk 302815)", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, splitDebugInlining: true)
!1 = !DIFile(filename: "foo.cpp", directory: "/usr/local/google/home/blaikie/dev/scratch")
!2 = !{}
!3 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !4, producer: "clang version 5.0.0 (trunk 302809) (llvm/trunk 302815)", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, splitDebugInlining: true)
!4 = !DIFile(filename: "bar.cpp", directory: "/usr/local/google/home/blaikie/dev/scratch")
!5 = !{!"clang version 5.0.0 (trunk 302809) (llvm/trunk 302815)"}
!6 = !{i32 2, !"Dwarf Version", i32 4}
!7 = !{i32 2, !"Debug Info Version", i32 3}
!8 = distinct !DISubprogram(name: "f1", linkageName: "_Z2f12t1", scope: !1, file: !1, line: 3, type: !9, isLocal: false, isDefinition: true, scopeLine: 3, flags: DIFlagPrototyped, isOptimized: false, unit: !0, variables: !2)
!9 = !DISubroutineType(types: !10)
!10 = !{null, !11}
!11 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "t1", file: !1, line: 1, size: 32, elements: !12, identifier: "_ZTS2t1")
!12 = !{!13}
!13 = !DIDerivedType(tag: DW_TAG_member, name: "i", scope: !11, file: !1, line: 1, baseType: !14, size: 32)
!14 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
!15 = !DILocalVariable(name: "t", arg: 1, scope: !8, file: !1, line: 3, type: !11)
!16 = !DIExpression()
!17 = !DILocation(line: 3, column: 43, scope: !8)
!18 = !DILocation(line: 4, column: 3, scope: !8)
!19 = !DILocation(line: 5, column: 1, scope: !8)
!20 = distinct !DISubprogram(name: "foo", linkageName: "_Z3foo2t1", scope: !1, file: !1, line: 6, type: !9, isLocal: false, isDefinition: true, scopeLine: 6, flags: DIFlagPrototyped, isOptimized: false, unit: !0, variables: !2)
!21 = !DILocation(line: 3, column: 43, scope: !8, inlinedAt: !22)
!22 = distinct !DILocation(line: 7, column: 3, scope: !20)
!23 = !DILocalVariable(name: "t", arg: 1, scope: !20, file: !1, line: 6, type: !11)
!24 = !DILocation(line: 6, column: 13, scope: !20)
!25 = !DILocation(line: 7, column: 6, scope: !20)
!26 = !DILocation(line: 7, column: 3, scope: !20)
!27 = !DILocation(line: 4, column: 3, scope: !8, inlinedAt: !22)
!28 = !DILocation(line: 8, column: 1, scope: !20)
!29 = distinct !DISubprogram(name: "bar", linkageName: "_Z3bar2t1", scope: !4, file: !4, line: 3, type: !9, isLocal: false, isDefinition: true, scopeLine: 3, flags: DIFlagPrototyped, isOptimized: false, unit: !3, variables: !2)
!30 = !DILocation(line: 3, column: 43, scope: !8, inlinedAt: !31)
!31 = distinct !DILocation(line: 4, column: 3, scope: !29)
!32 = !DILocalVariable(name: "t", arg: 1, scope: !29, file: !4, line: 3, type: !11)
!33 = !DILocation(line: 3, column: 13, scope: !29)
!34 = !DILocation(line: 4, column: 6, scope: !29)
!35 = !DILocation(line: 4, column: 3, scope: !29)
!36 = !DILocation(line: 4, column: 3, scope: !8, inlinedAt: !31)
!37 = !DILocation(line: 5, column: 1, scope: !29)
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