test/DebugInfo/MIR/Mips/call-site-info-update-delay-slot-filler.mir

## Test mips32r6:
# RUN: llc -mtriple mips-linux-gnu -emit-call-site-info -run-pass=mips-delay-slot-filler %s -o -| FileCheck %s

## Following code is used for producing this test case.
##
## (*pm_power_off)();
## machine_power_off() { pm_power_off(); }
##
## Used command:
## clang --target=mips-linux-gnu -march=mips32r6 -g -O2 -c m.c -mllvm -stop-before=mips-delay-slot-filler

## Confirm that call site info exists after mips-delay-slot-filler, although, 
## the pass replaced the call instruction.
# CHECK: callSites:
# CHECK-NEXT: - { bb: {{.*}}, offset: {{.*}}, fwdArgRegs:

--- |
  ; ModuleID = 'm.c'
  source_filename = "m.c"
  target datalayout = "E-m:m-p:32:32-i8:8:32-i16:16:32-i64:64-n32-S64"
  target triple = "mips-unknown-linux-gnu"
  
  @pm_power_off = dso_local local_unnamed_addr global i32 (...)* null, align 4, !dbg !0
  
  ; Function Attrs: nounwind
  define dso_local i32 @machine_power_off() local_unnamed_addr #0 !dbg !14 {
  entry:
    %0 = load i32 ()*, i32 ()** bitcast (i32 (...)** @pm_power_off to i32 ()**), align 4, !dbg !17
    %call = tail call i32 %0(), !dbg !17
    ret i32 undef, !dbg !17
  }
  
  attributes #0 = { "target-cpu"="mips32r6" }
  
  !llvm.dbg.cu = !{!2}
  !llvm.module.flags = !{!10, !11, !12}
  !llvm.ident = !{!13}
  
  !0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
  !1 = distinct !DIGlobalVariable(name: "pm_power_off", scope: !2, file: !3, line: 1, type: !6, isLocal: false, isDefinition: true)
  !2 = distinct !DICompileUnit(language: DW_LANG_C99, file: !3, producer: "clang version 12.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5, splitDebugInlining: false, nameTableKind: None)
  !3 = !DIFile(filename: "m.c", directory: "/dir")
  !4 = !{}
  !5 = !{!0}
  !6 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !7, size: 32)
  !7 = !DISubroutineType(types: !8)
  !8 = !{!9, null}
  !9 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
  !10 = !{i32 7, !"Dwarf Version", i32 4}
  !11 = !{i32 2, !"Debug Info Version", i32 3}
  !12 = !{i32 1, !"wchar_size", i32 4}
  !13 = !{!"clang version 12.0.0"}
  !14 = distinct !DISubprogram(name: "machine_power_off", scope: !3, file: !3, line: 2, type: !15, scopeLine: 2, flags: DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !2, retainedNodes: !4)
  !15 = !DISubroutineType(types: !16)
  !16 = !{!9}
  !17 = !DILocation(line: 2, column: 23, scope: !14)

...
---
name:            machine_power_off
alignment:       4
stack:
  - { id: 0, name: '', type: spill-slot, offset: -4, size: 4, alignment: 4, 
      stack-id: default, callee-saved-register: '$ra', callee-saved-restored: true, 
      debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
callSites:
  - { bb: 0, offset: 6, fwdArgRegs: [] }
body:             |
  bb.0.entry:
    liveins: $ra
  
    $sp = ADDiu $sp, -24
    CFI_INSTRUCTION def_cfa_offset 24
    SW killed $ra, $sp, 20 :: (store 4 into %stack.0)
    CFI_INSTRUCTION offset $ra_64, -4
    renamable $at = LUi target-flags(mips-abs-hi) @pm_power_off, debug-location !17
    renamable $t9 = LW killed renamable $at, target-flags(mips-abs-lo) @pm_power_off, debug-location !17 :: (dereferenceable load 4 from `i32 ()** bitcast (i32 (...)** @pm_power_off to i32 ()**)`)
    JALRPseudo $t9, csr_o32_fp64, implicit-def dead $ra, implicit-def $sp, implicit-def dead $v0, debug-location !17
    $ra = LW $sp, 20, debug-location !17 :: (load 4 from %stack.0)
    $sp = ADDiu $sp, 24
    PseudoReturn undef $ra, implicit undef $v0, debug-location !17

...