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llvm-mirror/test/DebugInfo/COFF/multifile.ll
Reid Kleckner 2a9d1489b6 [codeview] Emit S_FRAMEPROC and use S_DEFRANGE_FRAMEPOINTER_REL 
Summary:
Before this change, LLVM would always describe locals on the stack as
being relative to some specific register, RSP, ESP, EBP, ESI, etc.
Variables in stack memory are pretty common, so there is a special
S_DEFRANGE_FRAMEPOINTER_REL symbol for them. This change uses it to
reduce the size of our debug info.

On top of the size savings, there are cases on 32-bit x86 where local
variables are addressed from ESP, but ESP changes across the function.
Unlike in DWARF, there is no FPO data to describe the stack adjustments
made to push arguments onto the stack and pop them off after the call,
which makes it hard for the debugger to find the local variables in
frames further up the stack.

To handle this, CodeView has a special VFRAME register, which
corresponds to the $T0 variable set by our FPO data in 32-bit.  Offsets
to local variables are instead relative to this value.

This is part of PR38857.

Reviewers: hans, zturner, javed.absar

Subscribers: aprantl, hiraditya, JDevlieghere, llvm-commits

Differential Revision: https://reviews.llvm.org/D52217

llvm-svn: 343543
2018-10-01 21:59:45 +00:00

244 lines
9.0 KiB
LLVM
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; RUN: llc -mcpu=core2 -mtriple=i686-pc-win32 -O0 < %s | FileCheck --check-prefix=X86 %s
; RUN: llc -mcpu=core2 -mtriple=i686-pc-win32 -o - -O0 < %s | llvm-mc -triple=i686-pc-win32 -filetype=obj | llvm-readobj -s -sr -codeview -section-symbols | FileCheck --check-prefix=OBJ32 %s
; RUN: llc -mcpu=core2 -mtriple=x86_64-pc-win32 -O0 < %s | FileCheck --check-prefix=X64 %s
; RUN: llc -mcpu=core2 -mtriple=x86_64-pc-win32 -o - -O0 < %s | llvm-mc -triple=x86_64-pc-win32 -filetype=obj | llvm-readobj -s -sr -codeview -section-symbols | FileCheck --check-prefix=OBJ64 %s
; This LL file was generated by running clang on the following code:
; D:\input.c:
; 1 void g(void);
; 2
; 3 void f(void) {
; 4 #line 1 "one.c"
; 5 g();
; 6 #line 2 "two.c"
; 7 g();
; 8 #line 7 "one.c"
; 9 g();
; 10 }
; X86-LABEL: _f:
; X86: # %bb.
; X86: .cv_file 1 "D:\\one.c" "70B51F534D80639D033AE92C6A856AF6" 1
; X86: .cv_loc 0 1 1 0 # one.c:1:0
; X86: calll _g
; X86: .cv_file 2 "D:\\two.c" "70B51F534D80639D033AE92C6A856AF6" 1
; X86: .cv_loc 0 2 2 0 # two.c:2:0
; X86: calll _g
; X86: .cv_loc 0 1 7 0 # one.c:7:0
; X86: calll _g
; X86: .cv_loc 0 1 8 0 # one.c:8:0
; X86: ret
; X86: [[END_OF_F:.?Lfunc_end.*]]:
; Line table
; X86: .cv_linetable 0, _f, [[END_OF_F]]
; File index to string table offset subsection
; X86-NEXT: .cv_filechecksums
; String table
; X86-NEXT: .cv_stringtable
; OBJ32: Section {
; OBJ32: Name: .debug$S (2E 64 65 62 75 67 24 53)
; OBJ32: Characteristics [ (0x42300040)
; OBJ32: ]
; OBJ32: Subsection [
; OBJ32-NEXT: SubSectionType: Symbols (0xF1)
; OBJ32: {{.*}}Proc{{.*}}Sym {
; OBJ32: CodeSize: 0x10
; OBJ32: DisplayName: f
; OBJ32: LinkageName: _f
; OBJ32: }
; OBJ32: ProcEnd {
; OBJ32: }
; OBJ32-NEXT: ]
; OBJ32: Subsection [
; OBJ32: SubSectionType: FileChecksums (0xF4)
; OBJ32-NEXT: SubSectionSize: 0x30
; OBJ32-NEXT: FileChecksum {
; OBJ32-NEXT: Filename: D:\one.c (0x1)
; OBJ32-NEXT: ChecksumSize: 0x10
; OBJ32-NEXT: ChecksumKind: MD5 (0x1)
; OBJ32-NEXT: ChecksumBytes: (70 B5 1F 53 4D 80 63 9D 03 3A E9 2C 6A 85 6A F6)
; OBJ32-NEXT: }
; OBJ32-NEXT: FileChecksum {
; OBJ32-NEXT: Filename: D:\two.c (0xA)
; OBJ32-NEXT: ChecksumSize: 0x10
; OBJ32-NEXT: ChecksumKind: MD5 (0x1)
; OBJ32-NEXT: ChecksumBytes: (70 B5 1F 53 4D 80 63 9D 03 3A E9 2C 6A 85 6A F6)
; OBJ32-NEXT: }
; OBJ32-NEXT: ]
; OBJ32: FunctionLineTable [
; OBJ32-NEXT: Name: _f
; OBJ32-NEXT: Flags: 0x0
; OBJ32-NEXT: CodeSize: 0x10
; OBJ32-NEXT: FilenameSegment [
; OBJ32-NEXT: Filename: D:\one.c
; OBJ32-NEXT: +0x0 [
; OBJ32-NEXT: LineNumberStart: 1
; OBJ32-NEXT: LineNumberEndDelta: 0
; OBJ32-NEXT: IsStatement: No
; OBJ32-NEXT: ]
; OBJ32-NEXT: ]
; OBJ32-NEXT: FilenameSegment [
; OBJ32-NEXT: Filename: D:\two.c
; OBJ32-NEXT: +0x5 [
; OBJ32-NEXT: LineNumberStart: 2
; OBJ32-NEXT: LineNumberEndDelta: 0
; OBJ32-NEXT: IsStatement: No
; OBJ32-NEXT: ]
; OBJ32-NEXT: ]
; OBJ32-NEXT: FilenameSegment [
; OBJ32-NEXT: Filename: D:\one.c
; OBJ32-NEXT: +0xA [
; OBJ32-NEXT: LineNumberStart: 7
; OBJ32-NEXT: LineNumberEndDelta: 0
; OBJ32-NEXT: IsStatement: No
; OBJ32-NEXT: ]
; OBJ32-NEXT: +0xF [
; OBJ32-NEXT: LineNumberStart: 8
; OBJ32-NEXT: LineNumberEndDelta: 0
; OBJ32-NEXT: IsStatement: No
; OBJ32-NEXT: ]
; OBJ32-NEXT: ]
; OBJ32-NEXT: ]
; X64-LABEL: f:
; X64-NEXT: .L{{.*}}:{{$}}
; X64: .cv_file 1 "D:\\input.c" "70B51F534D80639D033AE92C6A856AF6" 1
; X64: .cv_loc 0 1 3 0 # input.c:3:0
; X64: # %bb.
; X64: subq $40, %rsp
; X64: .cv_file 2 "D:\\one.c" "70B51F534D80639D033AE92C6A856AF6" 1
; X64: .cv_loc 0 2 1 0 # one.c:1:0
; X64: callq g
; X64: .cv_file 3 "D:\\two.c" "70B51F534D80639D033AE92C6A856AF6" 1
; X64: .cv_loc 0 3 2 0 # two.c:2:0
; X64: callq g
; X64: .cv_loc 0 2 7 0 # one.c:7:0
; X64: callq g
; X64: .cv_loc 0 2 8 0 # one.c:8:0
; X64: addq $40, %rsp
; X64-NEXT: ret
; X64: [[END_OF_F:.?Lfunc_end.*]]:
; X64: .cv_linetable 0, f, [[END_OF_F]]
; X64: .cv_filechecksums
; X64: .cv_stringtable
; OBJ64: Section {
; OBJ64: Name: .debug$S (2E 64 65 62 75 67 24 53)
; OBJ64: Characteristics [ (0x42300040)
; OBJ64: ]
; OBJ64: Subsection [
; OBJ64-NEXT: SubSectionType: Symbols (0xF1)
; OBJ64: {{.*}}Proc{{.*}}Sym {
; OBJ64: CodeSize: 0x18
; OBJ64: DisplayName: f
; OBJ64: LinkageName: f
; OBJ64: }
; OBJ64: ProcEnd {
; OBJ64: }
; OBJ64-NEXT: ]
; OBJ64: Subsection [
; OBJ64: SubSectionType: FileChecksums (0xF4)
; OBJ64-NEXT: SubSectionSize: 0x48
; OBJ64-NEXT: FileChecksum {
; OBJ64-NEXT: Filename: D:\input.c (0x1)
; OBJ64-NEXT: ChecksumSize: 0x10
; OBJ64-NEXT: ChecksumKind: MD5 (0x1)
; OBJ64-NEXT: ChecksumBytes: (70 B5 1F 53 4D 80 63 9D 03 3A E9 2C 6A 85 6A F6)
; OBJ64-NEXT: }
; OBJ64-NEXT: FileChecksum {
; OBJ64-NEXT: Filename: D:\one.c (0xC)
; OBJ64-NEXT: ChecksumSize: 0x10
; OBJ64-NEXT: ChecksumKind: MD5 (0x1)
; OBJ64-NEXT: ChecksumBytes: (70 B5 1F 53 4D 80 63 9D 03 3A E9 2C 6A 85 6A F6)
; OBJ64-NEXT: }
; OBJ64-NEXT: FileChecksum {
; OBJ64-NEXT: Filename: D:\two.c (0x15)
; OBJ64-NEXT: ChecksumSize: 0x10
; OBJ64-NEXT: ChecksumKind: MD5 (0x1)
; OBJ64-NEXT: ChecksumBytes: (70 B5 1F 53 4D 80 63 9D 03 3A E9 2C 6A 85 6A F6)
; OBJ64-NEXT: }
; OBJ64-NEXT: ]
; OBJ64: FunctionLineTable [
; OBJ64-NEXT: Name: f
; OBJ64-NEXT: Flags: 0x0
; OBJ64-NEXT: CodeSize: 0x18
; OBJ64-NEXT: FilenameSegment [
; OBJ64-NEXT: Filename: D:\input.c
; OBJ64-NEXT: +0x0 [
; OBJ64-NEXT: LineNumberStart: 3
; OBJ64-NEXT: LineNumberEndDelta: 0
; OBJ64-NEXT: IsStatement: No
; OBJ64-NEXT: ]
; OBJ64-NEXT: ]
; OBJ64-NEXT: FilenameSegment [
; OBJ64-NEXT: Filename: D:\one.c
; OBJ64-NEXT: +0x4 [
; OBJ64-NEXT: LineNumberStart: 1
; OBJ64-NEXT: LineNumberEndDelta: 0
; OBJ64-NEXT: IsStatement: No
; OBJ64-NEXT: ]
; OBJ64-NEXT: ]
; OBJ64-NEXT: FilenameSegment [
; OBJ64-NEXT: Filename: D:\two.c
; OBJ64-NEXT: +0x9 [
; OBJ64-NEXT: LineNumberStart: 2
; OBJ64-NEXT: LineNumberEndDelta: 0
; OBJ64-NEXT: IsStatement: No
; OBJ64-NEXT: ]
; OBJ64-NEXT: ]
; OBJ64-NEXT: FilenameSegment [
; OBJ64-NEXT: Filename: D:\one.c
; OBJ64-NEXT: +0xE [
; OBJ64-NEXT: LineNumberStart: 7
; OBJ64-NEXT: LineNumberEndDelta: 0
; OBJ64-NEXT: IsStatement: No
; OBJ64-NEXT: ]
; OBJ64-NEXT: +0x13 [
; OBJ64-NEXT: LineNumberStart: 8
; OBJ64-NEXT: LineNumberEndDelta: 0
; OBJ64-NEXT: IsStatement: No
; OBJ64-NEXT: ]
; OBJ64-NEXT: ]
; OBJ64-NEXT: ]
; Function Attrs: nounwind
define void @f() #0 !dbg !4 {
entry:
call void @g(), !dbg !12
call void @g(), !dbg !15
call void @g(), !dbg !18
ret void, !dbg !19
}
declare void @g() #1
attributes #0 = { nounwind "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "no-realign-stack" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
attributes #1 = { "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "no-realign-stack" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!9, !10}
!llvm.ident = !{!11}
!0 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.5 ", isOptimized: false, emissionKind: FullDebug, file: !1, enums: !2, retainedTypes: !2, globals: !2, imports: !2)
!1 = !DIFile(filename: "<unknown>", directory: "D:\5C", checksumkind: CSK_MD5, checksum:"70b51f534d80639d033ae92c6a856af6")
!2 = !{}
!4 = distinct !DISubprogram(name: "f", line: 3, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, unit: !0, scopeLine: 3, file: !5, scope: !6, type: !7, retainedNodes: !2)
!5 = !DIFile(filename: "input.c", directory: "D:\5C", checksumkind: CSK_MD5, checksum:"70b51f534d80639d033ae92c6a856af6")
!6 = !DIFile(filename: "input.c", directory: "D:C", checksumkind: CSK_MD5, checksum:"70b51f534d80639d033ae92c6a856af6")
!7 = !DISubroutineType(types: !8)
!8 = !{null}
!9 = !{i32 2, !"CodeView", i32 1}
!10 = !{i32 1, !"Debug Info Version", i32 3}
!11 = !{!"clang version 3.5 "}
!12 = !DILocation(line: 1, scope: !13)
!13 = !DILexicalBlockFile(discriminator: 0, file: !14, scope: !4)
!14 = !DIFile(filename: "one.c", directory: "D:\5C", checksumkind: CSK_MD5, checksum:"70b51f534d80639d033ae92c6a856af6")
!15 = !DILocation(line: 2, scope: !16)
!16 = !DILexicalBlockFile(discriminator: 0, file: !17, scope: !4)
!17 = !DIFile(filename: "two.c", directory: "D:\5C", checksumkind: CSK_MD5, checksum:"70b51f534d80639d033ae92c6a856af6")
!18 = !DILocation(line: 7, scope: !13)
!19 = !DILocation(line: 8, scope: !13)
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