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llvm-project/llvm/test/DebugInfo/XCOFF/function-sections.ll
Chen Zheng fb45493562 [DebugLine] save one debug line entry for empty prologue 
Reland D147506 after fixing the failure in bot
https://lab.llvm.org/buildbot/#/builders/247/builds/4125

Some debuggers like DBX on AIX assume the address in debug line
entries is always incremental. But clang generates two entries (entry
for file scope line and entry for prologue end) with same address if
prologue is empty

And if the prologue is empty, seems the first debug line entry for the
function is unnecessary(i.e. removing the first entry won't impact the
behavior in GDB on Linux), so I implement this for all debuggers.

Reviewed By: dblaikie

Differential Revision: https://reviews.llvm.org/D147506
2023-05-10 01:21:02 +00:00

300 lines
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; RUN: llc -debugger-tune=gdb -mtriple powerpc-ibm-aix-xcoff -function-sections \
; RUN: < %s | FileCheck %s
source_filename = "1.c"
target datalayout = "E-m:a-p:32:32-i64:64-n32"
; Function Attrs: noinline nounwind optnone
define i32 @foo() #0 !dbg !8 {
entry:
ret i32 0, !dbg !12
}
; Function Attrs: noinline nounwind optnone
define i32 @bar() #0 !dbg !13 {
entry:
ret i32 1, !dbg !14
}
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!3, !4, !5, !6}
!llvm.ident = !{!7}
!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 13.0.0", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, nameTableKind: None)
!1 = !DIFile(filename: "1.c", directory: "debug")
!2 = !{}
!3 = !{i32 7, !"Dwarf Version", i32 3}
!4 = !{i32 2, !"Debug Info Version", i32 3}
!5 = !{i32 1, !"wchar_size", i32 2}
!6 = !{i32 7, !"PIC Level", i32 2}
!7 = !{!"clang version 13.0.0"}
!8 = distinct !DISubprogram(name: "foo", scope: !1, file: !1, line: 1, type: !9, scopeLine: 2, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !2)
!9 = !DISubroutineType(types: !10)
!10 = !{!11}
!11 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
!12 = !DILocation(line: 3, column: 3, scope: !8)
!13 = distinct !DISubprogram(name: "bar", scope: !1, file: !1, line: 6, type: !9, scopeLine: 7, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !2)
!14 = !DILocation(line: 8, column: 3, scope: !13)
; CHECK: .csect .text[PR],5
; CHECK-NEXT: .file "1.c"
; CHECK-NEXT: .csect .foo[PR],5
; CHECK-NEXT: .globl foo[DS] # -- Begin function foo
; CHECK-NEXT: .globl .foo[PR]
; CHECK-NEXT: .align 2
; CHECK-NEXT: .csect foo[DS],2
; CHECK-NEXT: .vbyte 4, .foo[PR] # @foo
; CHECK-NEXT: .vbyte 4, TOC[TC0]
; CHECK-NEXT: .vbyte 4, 0
; CHECK-NEXT: .csect .foo[PR],5
; CHECK-NEXT: L..func_begin0:
; CHECK-NEXT: # %bb.0: # %entry
; CHECK-NEXT: L..tmp0:
; CHECK-NEXT: li 3, 0
; CHECK-NEXT: blr
; CHECK-NEXT: L..tmp1:
; CHECK-NEXT: L..foo0:
; CHECK-NEXT: .vbyte 4, 0x00000000 # Traceback table begin
; CHECK-NEXT: .byte 0x00 # Version = 0
; CHECK-NEXT: .byte 0x09 # Language = CPlusPlus
; CHECK-NEXT: .byte 0x20 # -IsGlobaLinkage, -IsOutOfLineEpilogOrPrologue
; CHECK-NEXT: # +HasTraceBackTableOffset, -IsInternalProcedure
; CHECK-NEXT: # -HasControlledStorage, -IsTOCless
; CHECK-NEXT: # -IsFloatingPointPresent
; CHECK-NEXT: # -IsFloatingPointOperationLogOrAbortEnabled
; CHECK-NEXT: .byte 0x40 # -IsInterruptHandler, +IsFunctionNamePresent, -IsAllocaUsed
; CHECK-NEXT: # OnConditionDirective = 0, -IsCRSaved, -IsLRSaved
; CHECK-NEXT: .byte 0x00 # -IsBackChainStored, -IsFixup, NumOfFPRsSaved = 0
; CHECK-NEXT: .byte 0x00 # -HasExtensionTable, -HasVectorInfo, NumOfGPRsSaved = 0
; CHECK-NEXT: .byte 0x00 # NumberOfFixedParms = 0
; CHECK-NEXT: .byte 0x01 # NumberOfFPParms = 0, +HasParmsOnStack
; CHECK-NEXT: .vbyte 4, L..foo0-.foo[PR] # Function size
; CHECK-NEXT: .vbyte 2, 0x0003 # Function name len = 3
; CHECK-NEXT: .byte "foo" # Function Name
; CHECK-NEXT: L..func_end0:
; CHECK-NEXT: # -- End function
; CHECK-NEXT: .csect .bar[PR],5
; CHECK-NEXT: .globl bar[DS] # -- Begin function bar
; CHECK-NEXT: .globl .bar[PR]
; CHECK-NEXT: .align 2
; CHECK-NEXT: .csect bar[DS],2
; CHECK-NEXT: .vbyte 4, .bar[PR] # @bar
; CHECK-NEXT: .vbyte 4, TOC[TC0]
; CHECK-NEXT: .vbyte 4, 0
; CHECK-NEXT: .csect .bar[PR],5
; CHECK-NEXT: L..func_begin1:
; CHECK-NEXT: # %bb.0: # %entry
; CHECK-NEXT: L..tmp2:
; CHECK-NEXT: li 3, 1
; CHECK-NEXT: blr
; CHECK-NEXT: L..tmp3:
; CHECK-NEXT: L..bar0:
; CHECK-NEXT: .vbyte 4, 0x00000000 # Traceback table begin
; CHECK-NEXT: .byte 0x00 # Version = 0
; CHECK-NEXT: .byte 0x09 # Language = CPlusPlus
; CHECK-NEXT: .byte 0x20 # -IsGlobaLinkage, -IsOutOfLineEpilogOrPrologue
; CHECK-NEXT: # +HasTraceBackTableOffset, -IsInternalProcedure
; CHECK-NEXT: # -HasControlledStorage, -IsTOCless
; CHECK-NEXT: # -IsFloatingPointPresent
; CHECK-NEXT: # -IsFloatingPointOperationLogOrAbortEnabled
; CHECK-NEXT: .byte 0x40 # -IsInterruptHandler, +IsFunctionNamePresent, -IsAllocaUsed
; CHECK-NEXT: # OnConditionDirective = 0, -IsCRSaved, -IsLRSaved
; CHECK-NEXT: .byte 0x00 # -IsBackChainStored, -IsFixup, NumOfFPRsSaved = 0
; CHECK-NEXT: .byte 0x00 # -HasExtensionTable, -HasVectorInfo, NumOfGPRsSaved = 0
; CHECK-NEXT: .byte 0x00 # NumberOfFixedParms = 0
; CHECK-NEXT: .byte 0x01 # NumberOfFPParms = 0, +HasParmsOnStack
; CHECK-NEXT: .vbyte 4, L..bar0-.bar[PR] # Function size
; CHECK-NEXT: .vbyte 2, 0x0003 # Function name len = 3
; CHECK-NEXT: .byte "bar" # Function Name
; CHECK-NEXT: L..func_end1:
; CHECK-NEXT: # -- End function
; CHECK-NEXT: L..sec_end0:
; CHECK: .dwsect 0x60000
; CHECK-NEXT: L...dwabrev:
; CHECK-NEXT: .byte 1 # Abbreviation Code
; CHECK-NEXT: .byte 17 # DW_TAG_compile_unit
; CHECK-NEXT: .byte 1 # DW_CHILDREN_yes
; CHECK-NEXT: .byte 37 # DW_AT_producer
; CHECK-NEXT: .byte 14 # DW_FORM_strp
; CHECK-NEXT: .byte 19 # DW_AT_language
; CHECK-NEXT: .byte 5 # DW_FORM_data2
; CHECK-NEXT: .byte 3 # DW_AT_name
; CHECK-NEXT: .byte 14 # DW_FORM_strp
; CHECK-NEXT: .byte 16 # DW_AT_stmt_list
; CHECK-NEXT: .byte 6 # DW_FORM_data4
; CHECK-NEXT: .byte 27 # DW_AT_comp_dir
; CHECK-NEXT: .byte 14 # DW_FORM_strp
; CHECK-NEXT: .byte 17 # DW_AT_low_pc
; CHECK-NEXT: .byte 1 # DW_FORM_addr
; CHECK-NEXT: .byte 85 # DW_AT_ranges
; CHECK-NEXT: .byte 6 # DW_FORM_data4
; CHECK-NEXT: .byte 0 # EOM(1)
; CHECK-NEXT: .byte 0 # EOM(2)
; CHECK-NEXT: .byte 2 # Abbreviation Code
; CHECK-NEXT: .byte 46 # DW_TAG_subprogram
; CHECK-NEXT: .byte 0 # DW_CHILDREN_no
; CHECK-NEXT: .byte 17 # DW_AT_low_pc
; CHECK-NEXT: .byte 1 # DW_FORM_addr
; CHECK-NEXT: .byte 18 # DW_AT_high_pc
; CHECK-NEXT: .byte 1 # DW_FORM_addr
; CHECK-NEXT: .byte 64 # DW_AT_frame_base
; CHECK-NEXT: .byte 10 # DW_FORM_block1
; CHECK-NEXT: .byte 3 # DW_AT_name
; CHECK-NEXT: .byte 14 # DW_FORM_strp
; CHECK-NEXT: .byte 58 # DW_AT_decl_file
; CHECK-NEXT: .byte 11 # DW_FORM_data1
; CHECK-NEXT: .byte 59 # DW_AT_decl_line
; CHECK-NEXT: .byte 11 # DW_FORM_data1
; CHECK-NEXT: .byte 39 # DW_AT_prototyped
; CHECK-NEXT: .byte 12 # DW_FORM_flag
; CHECK-NEXT: .byte 73 # DW_AT_type
; CHECK-NEXT: .byte 19 # DW_FORM_ref4
; CHECK-NEXT: .byte 63 # DW_AT_external
; CHECK-NEXT: .byte 12 # DW_FORM_flag
; CHECK-NEXT: .byte 0 # EOM(1)
; CHECK-NEXT: .byte 0 # EOM(2)
; CHECK-NEXT: .byte 3 # Abbreviation Code
; CHECK-NEXT: .byte 36 # DW_TAG_base_type
; CHECK-NEXT: .byte 0 # DW_CHILDREN_no
; CHECK-NEXT: .byte 3 # DW_AT_name
; CHECK-NEXT: .byte 14 # DW_FORM_strp
; CHECK-NEXT: .byte 62 # DW_AT_encoding
; CHECK-NEXT: .byte 11 # DW_FORM_data1
; CHECK-NEXT: .byte 11 # DW_AT_byte_size
; CHECK-NEXT: .byte 11 # DW_FORM_data1
; CHECK-NEXT: .byte 0 # EOM(1)
; CHECK-NEXT: .byte 0 # EOM(2)
; CHECK-NEXT: .byte 0 # EOM(3)
; CHECK: .dwsect 0x10000
; CHECK-NEXT: L...dwinfo:
; CHECK-NEXT: L..cu_begin0:
; CHECK-NEXT: .vbyte 2, 3 # DWARF version number
; CHECK-NEXT: .vbyte 4, L...dwabrev # Offset Into Abbrev. Section
; CHECK-NEXT: .byte 4 # Address Size (in bytes)
; CHECK-NEXT: .byte 1 # Abbrev [1] 0xb:0x51 DW_TAG_compile_unit
; CHECK-NEXT: .vbyte 4, L..info_string0 # DW_AT_producer
; CHECK-NEXT: .vbyte 2, 12 # DW_AT_language
; CHECK-NEXT: .vbyte 4, L..info_string1 # DW_AT_name
; CHECK-NEXT: .vbyte 4, L..line_table_start0 # DW_AT_stmt_list
; CHECK-NEXT: .vbyte 4, L..info_string2 # DW_AT_comp_dir
; CHECK-NEXT: .vbyte 4, 0 # DW_AT_low_pc
; CHECK-NEXT: .vbyte 4, L..debug_ranges0 # DW_AT_ranges
; CHECK-NEXT: .byte 2 # Abbrev [2] 0x26:0x17 DW_TAG_subprogram
; CHECK-NEXT: .vbyte 4, L..func_begin0 # DW_AT_low_pc
; CHECK-NEXT: .vbyte 4, L..func_end0 # DW_AT_high_pc
; CHECK-NEXT: .byte 1 # DW_AT_frame_base
; CHECK-NEXT: .byte 81
; CHECK-NEXT: .vbyte 4, L..info_string3 # DW_AT_name
; CHECK-NEXT: .byte 1 # DW_AT_decl_file
; CHECK-NEXT: .byte 1 # DW_AT_decl_line
; CHECK-NEXT: .byte 1 # DW_AT_prototyped
; CHECK-NEXT: .vbyte 4, 84 # DW_AT_type
; CHECK-NEXT: .byte 1 # DW_AT_external
; CHECK-NEXT: .byte 2 # Abbrev [2] 0x3d:0x17 DW_TAG_subprogram
; CHECK-NEXT: .vbyte 4, L..func_begin1 # DW_AT_low_pc
; CHECK-NEXT: .vbyte 4, L..func_end1 # DW_AT_high_pc
; CHECK-NEXT: .byte 1 # DW_AT_frame_base
; CHECK-NEXT: .byte 81
; CHECK-NEXT: .vbyte 4, L..info_string5 # DW_AT_name
; CHECK-NEXT: .byte 1 # DW_AT_decl_file
; CHECK-NEXT: .byte 6 # DW_AT_decl_line
; CHECK-NEXT: .byte 1 # DW_AT_prototyped
; CHECK-NEXT: .vbyte 4, 84 # DW_AT_type
; CHECK-NEXT: .byte 1 # DW_AT_external
; CHECK-NEXT: .byte 3 # Abbrev [3] 0x54:0x7 DW_TAG_base_type
; CHECK-NEXT: .vbyte 4, L..info_string4 # DW_AT_name
; CHECK-NEXT: .byte 5 # DW_AT_encoding
; CHECK-NEXT: .byte 4 # DW_AT_byte_size
; CHECK-NEXT: .byte 0 # End Of Children Mark
; CHECK-NEXT: L..debug_info_end0:
; CHECK: .dwsect 0x80000
; CHECK-NEXT: L...dwrnges:
; CHECK-NEXT: L..debug_ranges0:
; CHECK-NEXT: .vbyte 4, L..func_begin0
; CHECK-NEXT: .vbyte 4, L..func_end0
; CHECK-NEXT: .vbyte 4, L..func_begin1
; CHECK-NEXT: .vbyte 4, L..func_end1
; CHECK-NEXT: .vbyte 4, 0
; CHECK-NEXT: .vbyte 4, 0
; CHECK: .dwsect 0x70000
; CHECK-NEXT: L...dwstr:
; CHECK-NEXT: L..info_string0:
; CHECK-NEXT: .string "clang version 13.0.0" # string offset=0
; CHECK-NEXT: L..info_string1:
; CHECK-NEXT: .string "1.c" # string offset=21
; CHECK-NEXT: L..info_string2:
; CHECK-NEXT: .string "debug" # string offset=25
; CHECK-NEXT: L..info_string3:
; CHECK-NEXT: .string "foo" # string offset=31
; CHECK-NEXT: L..info_string4:
; CHECK-NEXT: .string "int" # string offset=35
; CHECK-NEXT: L..info_string5:
; CHECK-NEXT: .string "bar" # string offset=39
; CHECK-NEXT: .toc
; CHECK: .dwsect 0x20000
; CHECK-NEXT: L...dwline:
; CHECK-NEXT: L..debug_line_0:
; CHECK-NEXT: .set L..line_table_start0, L..debug_line_0-4
; CHECK-NEXT: .vbyte 2, 3
; CHECK-NEXT: .vbyte 4, L..prologue_end0-L..prologue_start0
; CHECK-NEXT: L..prologue_start0:
; CHECK-NEXT: .byte 4
; CHECK-NEXT: .byte 1
; CHECK-NEXT: .byte -5
; CHECK-NEXT: .byte 14
; CHECK-NEXT: .byte 13
; CHECK-NEXT: .byte 0
; CHECK-NEXT: .byte 1
; CHECK-NEXT: .byte 1
; CHECK-NEXT: .byte 1
; CHECK-NEXT: .byte 1
; CHECK-NEXT: .byte 0
; CHECK-NEXT: .byte 0
; CHECK-NEXT: .byte 0
; CHECK-NEXT: .byte 1
; CHECK-NEXT: .byte 0
; CHECK-NEXT: .byte 0
; CHECK-NEXT: .byte 1
; CHECK-NEXT: .byte "debug"
; CHECK-NEXT: .byte 0
; CHECK-NEXT: .byte 0
; CHECK-NEXT: .byte "1.c"
; CHECK-NEXT: .byte 0
; CHECK-NEXT: .byte 1
; CHECK-NEXT: .byte 0
; CHECK-NEXT: .byte 0
; CHECK-NEXT: .byte 0
; CHECK-NEXT: L..prologue_end0:
; CHECK-NEXT: .byte 5
; CHECK-NEXT: .byte 3
; CHECK-NEXT: .byte 10
; CHECK-NEXT: .byte 0 # Set address to L..tmp0
; CHECK-NEXT: .byte 5
; CHECK-NEXT: .byte 2
; CHECK-NEXT: .vbyte 4, L..tmp0
; CHECK-NEXT: .byte 20 # Start sequence
; CHECK-NEXT: .byte 0 # Set address to L..func_end0
; CHECK-NEXT: .byte 5
; CHECK-NEXT: .byte 2
; CHECK-NEXT: .vbyte 4, L..func_end0
; CHECK-NEXT: .byte 0 # End sequence
; CHECK-NEXT: .byte 1
; CHECK-NEXT: .byte 1
; CHECK-NEXT: .byte 5
; CHECK-NEXT: .byte 3
; CHECK-NEXT: .byte 10
; CHECK-NEXT: .byte 0 # Set address to L..tmp2
; CHECK-NEXT: .byte 5
; CHECK-NEXT: .byte 2
; CHECK-NEXT: .vbyte 4, L..tmp2
; CHECK-NEXT: .byte 25 # Start sequence
; CHECK-NEXT: .byte 0 # Set address to L..func_end1
; CHECK-NEXT: .byte 5
; CHECK-NEXT: .byte 2
; CHECK-NEXT: .vbyte 4, L..func_end1
; CHECK-NEXT: .byte 0 # End sequence
; CHECK-NEXT: .byte 1
; CHECK-NEXT: .byte 1
; CHECK-NEXT: L..debug_line_end0:
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