llvm/test/DebugInfo/X86/debug-loc-offset.mir

# RUN: llc -o - %s -start-after=patchable-function -filetype=obj -O0 -mtriple=i386-unknown-linux-gnu -dwarf-version=4 | llvm-dwarfdump -v - | FileCheck %s

# From the code:
#
# debug-loc-offset1.cc
# int bar (int b) {
#   return b+4;
# }
#
# debug-loc-offset2.cc
# struct A {
#   int var;
#   virtual char foo();
# };
#
# void baz(struct A a) {
#   int z = 2;
#   if (a.var > 2)
#     z++;
#   if (a.foo() == 'a')
#     z++;
# }
#
# Compiled separately for i386-pc-linux-gnu and linked together.
# This ensures that we have multiple compile units and multiple location lists
# so that we can verify that
# debug_loc entries are relative to the low_pc of the CU. The loc entry for
# the byval argument in foo.cpp is in the second CU and so should have
# an offset relative to that CU rather than from the beginning of the text
# section.
#
# Checking that we have two compile units with two sets of high/lo_pc.
# CHECK: .debug_info contents
# CHECK: DW_TAG_compile_unit
# CHECK: DW_AT_low_pc {{.*}} (0x0000000000000020 ".text")
# CHECK: DW_AT_high_pc
#
# CHECK: DW_TAG_subprogram
# CHECK-NOT: DW_TAG
# CHECK: DW_AT_linkage_name [DW_FORM_strp]{{.*}}"_Z3baz1A"
# CHECK-NOT: {{DW_TAG|NULL}}
# CHECK: DW_TAG_formal_parameter
# CHECK-NOT: DW_TAG
# CHECK:       DW_AT_location [DW_FORM_sec_offset]   ({{.*}}
# CHECK-NEXT:    [0x00000020, 0x00000037): DW_OP_breg0 EAX+0, DW_OP_deref
# CHECK-NEXT:    [0x00000037, 0x00000063): DW_OP_breg5 EBP-8, DW_OP_deref, DW_OP_deref
# CHECK-NEXT:  DW_AT_name [DW_FORM_strp]{{.*}}"a"
#
# CHECK: DW_TAG_variable
# CHECK: DW_AT_location [DW_FORM_exprloc]
# CHECK-NOT: DW_AT_location
#
# CHECK: DW_TAG_compile_unit
# CHECK: DW_AT_low_pc {{.*}} (0x0000000000000000 ".text")
# CHECK: DW_AT_high_pc
#
# CHECK: DW_TAG_subprogram
# CHECK-NOT: DW_TAG
# CHECK: DW_AT_linkage_name [DW_FORM_strp]{{.*}}"_Z3bari"
# CHECK-NOT: {{DW_TAG|NULL}}
# CHECK: DW_TAG_formal_parameter
# CHECK-NOT: DW_TAG
# CHECK:       DW_AT_location [DW_FORM_sec_offset]   ({{.*}}
# CHECK-NEXT:    [0x00000000, 0x0000000a): DW_OP_consts +0, DW_OP_stack_value
# CHECK-NEXT:    [0x0000000a, 0x00000017): DW_OP_consts +1, DW_OP_stack_value)
# CHECK-NEXT:  DW_AT_name [DW_FORM_strp]{{.*}}"b"
#
# CHECK: .debug_loc contents:
# CHECK:       0x00000000:
# CHECK-NEXT:    [0x00000000, 0x0000000a): DW_OP_consts +0, DW_OP_stack_value
# CHECK-NEXT:    [0x0000000a, 0x00000017): DW_OP_consts +1, DW_OP_stack_value
# CHECK:       0x00000022:
# CHECK-NEXT:    [0x00000000, 0x00000017): DW_OP_breg0 EAX+0, DW_OP_deref
# CHECK-NEXT:    [0x00000017, 0x00000043): DW_OP_breg5 EBP-8, DW_OP_deref, DW_OP_deref
--- |
  target triple = "i386-unknown-linux-gnu"
  
  %struct.A = type { i32 (...)**, i32 }
  
  ; Function Attrs: nounwind
  define i32 @_Z3bari(i32 %b) #0 !dbg !10 {
  entry:
    %b.addr = alloca i32, align 4
    store i32 %b, i32* %b.addr, align 4
    call void @llvm.dbg.value(metadata i32 0, metadata !14, metadata !DIExpression()), !dbg !15
    %0 = load i32, i32* %b.addr, align 4, !dbg !16
    call void @llvm.dbg.value(metadata i32 1, metadata !14, metadata !DIExpression()), !dbg !15
    %add = add nsw i32 %0, 4, !dbg !16
    ret i32 %add, !dbg !16
  }
  
  ; Function Attrs: nounwind readnone speculatable
  declare void @llvm.dbg.declare(metadata, metadata, metadata) #1
  
  ; Function Attrs: nounwind readnone speculatable
  declare void @llvm.dbg.value(metadata, metadata, metadata) #1
  
  define void @_Z3baz1A(%struct.A* %a) #2 !dbg !17 {
  entry:
    %z = alloca i32, align 4
    call void @llvm.dbg.declare(metadata %struct.A* %a, metadata !20, metadata !DIExpression(DW_OP_deref)), !dbg !21
    call void @llvm.dbg.declare(metadata i32* %z, metadata !22, metadata !DIExpression()), !dbg !23
    store i32 2, i32* %z, align 4, !dbg !23
    %var = getelementptr inbounds %struct.A, %struct.A* %a, i32 0, i32 1, !dbg !24
    %0 = load i32, i32* %var, align 4, !dbg !24
    %cmp = icmp sgt i32 %0, 2, !dbg !24
    br i1 %cmp, label %if.then, label %if.end, !dbg !24
  
  if.then:                                          ; preds = %entry
    %1 = load i32, i32* %z, align 4, !dbg !26
    %inc = add nsw i32 %1, 1, !dbg !26
    store i32 %inc, i32* %z, align 4, !dbg !26
    br label %if.end, !dbg !26
  
  if.end:                                           ; preds = %if.then, %entry
    %call = call signext i8 @_ZN1A3fooEv(%struct.A* %a), !dbg !27
    %conv = sext i8 %call to i32, !dbg !27
    %cmp1 = icmp eq i32 %conv, 97, !dbg !27
    br i1 %cmp1, label %if.then2, label %if.end4, !dbg !27
  
  if.then2:                                         ; preds = %if.end
    %2 = load i32, i32* %z, align 4, !dbg !29
    %inc3 = add nsw i32 %2, 1, !dbg !29
    store i32 %inc3, i32* %z, align 4, !dbg !29
    br label %if.end4, !dbg !29
  
  if.end4:                                          ; preds = %if.then2, %if.end
    ret void, !dbg !30
  }
  
  declare signext i8 @_ZN1A3fooEv(%struct.A*) #2
  
  ; Function Attrs: nounwind
  declare void @llvm.stackprotector(i8*, i8**) #3
  
  attributes #0 = { nounwind "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 speculatable }
  attributes #2 = { "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 #3 = { nounwind }
  
  !llvm.dbg.cu = !{!0, !3}
  !llvm.module.flags = !{!7, !8}
  !llvm.ident = !{!9, !9}
  
  !0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "clang version 3.5.0 (210479)", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, retainedTypes: !2, globals: !2, imports: !2)
  !1 = !DIFile(filename: "debug-loc-offset1.cc", directory: "/llvm_cmake_gcc")
  !2 = !{}
  !3 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !4, producer: "clang version 3.5.0 (210479)", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, retainedTypes: !5, globals: !2, imports: !2)
  !4 = !DIFile(filename: "debug-loc-offset2.cc", directory: "/llvm_cmake_gcc")
  !5 = !{!6}
  !6 = !DICompositeType(tag: DW_TAG_structure_type, name: "A", file: !4, line: 1, flags: DIFlagFwdDecl, identifier: "_ZTS1A")
  !7 = !{i32 2, !"Dwarf Version", i32 4}
  !8 = !{i32 2, !"Debug Info Version", i32 3}
  !9 = !{!"clang version 3.5.0 (210479)"}
  !10 = distinct !DISubprogram(name: "bar", linkageName: "_Z3bari", scope: !1, file: !1, line: 1, type: !11, isLocal: false, isDefinition: true, scopeLine: 1, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, unit: !0, retainedNodes: !2)
  !11 = !DISubroutineType(types: !12)
  !12 = !{!13, !13}
  !13 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
  !14 = !DILocalVariable(name: "b", arg: 1, scope: !10, file: !1, line: 1, type: !13)
  !15 = !DILocation(line: 1, scope: !10)
  !16 = !DILocation(line: 2, scope: !10)
  !17 = distinct !DISubprogram(name: "baz", linkageName: "_Z3baz1A", scope: !4, file: !4, line: 6, type: !18, isLocal: false, isDefinition: true, scopeLine: 6, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, unit: !3, retainedNodes: !2)
  !18 = !DISubroutineType(types: !19)
  !19 = !{null, !6}
  !20 = !DILocalVariable(name: "a", arg: 1, scope: !17, file: !4, line: 6, type: !6)
  !21 = !DILocation(line: 6, scope: !17)
  !22 = !DILocalVariable(name: "z", scope: !17, file: !4, line: 7, type: !13)
  !23 = !DILocation(line: 7, scope: !17)
  !24 = !DILocation(line: 8, scope: !25)
  !25 = distinct !DILexicalBlock(scope: !17, file: !4, line: 8)
  !26 = !DILocation(line: 9, scope: !25)
  !27 = !DILocation(line: 10, scope: !28)
  !28 = distinct !DILexicalBlock(scope: !17, file: !4, line: 10)
  !29 = !DILocation(line: 11, scope: !28)
  !30 = !DILocation(line: 12, scope: !17)

...
---
name:            _Z3bari
alignment:       4
tracksRegLiveness: true
frameInfo:       
  stackSize:       8
  offsetAdjustment: -4
  maxAlignment:    4
  maxCallFrameSize: 0
fixedStack:      
  - { id: 0, type: spill-slot, offset: -8, size: 4, alignment: 8, stack-id: 0 }
  - { id: 1, size: 4, alignment: 16, stack-id: 0 }
stack:           
  - { id: 0, type: spill-slot, offset: -12, size: 4, alignment: 4, stack-id: 0 }
body:             |
  bb.0.entry:
    frame-setup PUSH32r killed $ebp, implicit-def $esp, implicit $esp
    CFI_INSTRUCTION def_cfa_offset 8
    CFI_INSTRUCTION offset $ebp, -8
    $ebp = frame-setup MOV32rr $esp
    CFI_INSTRUCTION def_cfa_register $ebp
    frame-setup PUSH32r undef $eax, implicit-def $esp, implicit $esp
    renamable $eax = MOV32rm $ebp, 1, $noreg, 8, $noreg :: (load 4 from %fixed-stack.1)
    DBG_VALUE 0, 0, !14, !DIExpression(), debug-location !15
    renamable $ecx = MOV32rm $ebp, 1, $noreg, 8, $noreg, debug-location !16 :: (load 4 from %ir.b.addr)
    DBG_VALUE 1, 0, !14, !DIExpression(), debug-location !15
    renamable $ecx = ADD32ri8 renamable $ecx, 4, implicit-def $eflags, debug-location !16
    MOV32mr $ebp, 1, $noreg, -4, $noreg, killed $eax :: (store 4 into %fixed-stack.1)
    $eax = MOV32rr killed $ecx, debug-location !16
    $esp = frame-destroy ADD32ri8 $esp, 4, implicit-def dead $eflags, debug-location !16
    $ebp = frame-destroy POP32r implicit-def $esp, implicit $esp, debug-location !16
    CFI_INSTRUCTION def_cfa $esp, 4, debug-location !16
    RETL implicit killed $eax, debug-location !16

...
---
name:            _Z3baz1A
alignment:       4
tracksRegLiveness: true
frameInfo:       
  stackSize:       28
  offsetAdjustment: -24
  maxAlignment:    4
  adjustsStack:    true
  hasCalls:        true
  maxCallFrameSize: 4
fixedStack:      
  - { id: 0, type: spill-slot, offset: -8, size: 4, alignment: 8, stack-id: 0 }
  - { id: 1, size: 4, alignment: 16, stack-id: 0, isImmutable: true }
stack:           
  - { id: 0, name: z, offset: -12, size: 4, alignment: 4, stack-id: 0, 
      debug-info-variable: '!22', debug-info-expression: '!DIExpression()', 
      debug-info-location: '!23' }
  - { id: 1, type: spill-slot, offset: -16, size: 4, alignment: 4, stack-id: 0 }
body:             |
  bb.0.entry:
    frame-setup PUSH32r killed $ebp, implicit-def $esp, implicit $esp
    CFI_INSTRUCTION def_cfa_offset 8
    CFI_INSTRUCTION offset $ebp, -8
    $ebp = frame-setup MOV32rr $esp
    CFI_INSTRUCTION def_cfa_register $ebp
    $esp = frame-setup SUB32ri8 $esp, 24, implicit-def dead $eflags
    renamable $eax = MOV32rm $ebp, 1, $noreg, 8, $noreg :: (load 4 from %fixed-stack.1)
    DBG_VALUE renamable $eax, 0, !20, !DIExpression(DW_OP_deref), debug-location !21
    MOV32mi $ebp, 1, $noreg, -4, $noreg, 2, debug-location !23 :: (store 4 into %ir.z)
    CMP32mi8 renamable $eax, 1, $noreg, 4, $noreg, 2, implicit-def $eflags, debug-location !24 :: (load 4 from %ir.var)
    MOV32mr $ebp, 1, $noreg, -8, $noreg, killed $eax :: (store 4 into %stack.1)
    DBG_VALUE $ebp, 0, !20, !DIExpression(DW_OP_constu, 8, DW_OP_minus, DW_OP_deref, DW_OP_deref), debug-location !21
    JLE_1 %bb.2, implicit $eflags, debug-location !24
  
  bb.1.if.then:
    DBG_VALUE $ebp, 0, !20, !DIExpression(DW_OP_constu, 8, DW_OP_minus, DW_OP_deref, DW_OP_deref), debug-location !21
    renamable $eax = MOV32rm $ebp, 1, $noreg, -4, $noreg, debug-location !26 :: (load 4 from %ir.z)
    renamable $eax = ADD32ri8 renamable $eax, 1, implicit-def $eflags, debug-location !26
    MOV32mr $ebp, 1, $noreg, -4, $noreg, killed renamable $eax, debug-location !26 :: (store 4 into %ir.z)
  
  bb.2.if.end:
    DBG_VALUE $ebp, 0, !20, !DIExpression(DW_OP_constu, 8, DW_OP_minus, DW_OP_deref, DW_OP_deref), debug-location !21
    $eax = MOV32rm $ebp, 1, $noreg, -8, $noreg :: (load 4 from %stack.1)
    MOV32mr $esp, 1, $noreg, 0, $noreg, killed renamable $eax, debug-location !27 :: (store 4 into stack)
    CALLpcrel32 @_ZN1A3fooEv, csr_32, implicit $esp, implicit $ssp, implicit-def $al, debug-location !27
    renamable $ecx = MOVSX32rr8 killed renamable $al, debug-location !27
    CMP32ri8 killed renamable $ecx, 97, implicit-def $eflags, debug-location !27
    JNE_1 %bb.4, implicit $eflags, debug-location !27
  
  bb.3.if.then2:
    DBG_VALUE $ebp, 0, !20, !DIExpression(DW_OP_constu, 8, DW_OP_minus, DW_OP_deref, DW_OP_deref), debug-location !21
    renamable $eax = MOV32rm $ebp, 1, $noreg, -4, $noreg, debug-location !29 :: (load 4 from %ir.z)
    renamable $eax = ADD32ri8 renamable $eax, 1, implicit-def $eflags, debug-location !29
    MOV32mr $ebp, 1, $noreg, -4, $noreg, killed renamable $eax, debug-location !29 :: (store 4 into %ir.z)
  
  bb.4.if.end4:
    DBG_VALUE $ebp, 0, !20, !DIExpression(DW_OP_constu, 8, DW_OP_minus, DW_OP_deref, DW_OP_deref), debug-location !21
    $esp = frame-destroy ADD32ri8 $esp, 24, implicit-def dead $eflags, debug-location !30
    $ebp = frame-destroy POP32r implicit-def $esp, implicit $esp, debug-location !30
    CFI_INSTRUCTION def_cfa $esp, 4, debug-location !30
    RETL debug-location !30

...