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llvm-project/llvm/test/DebugInfo/MIR/X86/dbg-stack-value-range.mir
Simon Pilgrim d391e4fe84 [X86] Update RET/LRET instruction to use the same naming convention as IRET (PR36876). NFC 
Be more consistent in the naming convention for the various RET instructions to specify in terms of bitwidth.

Helps prevent future scheduler model mismatches like those that were only addressed in D44687.

Differential Revision: https://reviews.llvm.org/D113302
2021-11-07 15:06:54 +00:00

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# RUN: llc -start-before=livedebugvalues %s -filetype=asm -o -| FileCheck %s
#
# DbgEntityHistoryCalculator should close variable's range at the end of
# the basic block when variable is referenced through non-changing frame
# pointer register. Having BB1 that branches to BB2 and BB3, where
# BB2 falls through to BB3, variable can have different locations at BB1 and BB2.
# Since input locations at BB3 for same variable are different LiveDebugValues
# wont generate DBG_VALUE for BB3. If last variable location at BB2 is
# non-changing register, DbgEntityHistoryCalculator will extend range of
# DBG_VALUE from BB2 to whole BB3 and thus produce incorrect range for
# case when we took branch BB3 from BB1.
#
# Verifies that "local1" stack location is ended at the end of the block (.Ltmp6).
#
# CHECK: .Ltmp4:
# CHECK-NEXT: #DEBUG_VALUE: foo:local1 <- [DW_OP_constu 4, DW_OP_minus, DW_OP_deref] $rbp
# CHECK: jmp .LBB0_2
# CHECK-NEXT: .Ltmp6:
# CHECK: .Lfunc_end0:
#
# CHECK: .Ldebug_loc2:
# CHECK-NEXT: .quad .Ltmp1-.Lfunc_begin0
# CHECK-NEXT: .quad .Ltmp4-.Lfunc_begin0
# CHECK-NEXT: .short 1 # Loc expr size
# CHECK-NEXT: .byte 94 # super-register DW_OP_reg14
# CHECK-NEXT: .quad .Ltmp4-.Lfunc_begin0
# CHECK-NEXT: .quad .Ltmp6-.Lfunc_begin0
# CHECK-NEXT: .short 2 # Loc expr size
# CHECK-NEXT: .byte 118 # DW_OP_breg6
# CHECK-NEXT: .byte 124 # -4
#
# CHECK: .long .Ldebug_loc2 # DW_AT_location
# CHECK-NEXT: .long .Linfo_string7 # DW_AT_name
#
# CHECK: .Linfo_string7:
# CHECK-NEXT: .asciz "local1"
--- |
; ModuleID = 'dbg-stack-value-range.ll'
source_filename = "dbg-stack-value-range.c"
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
; Function Attrs: nounwind uwtable
define dso_local i32 @foo(i32 %X) local_unnamed_addr #0 !dbg !7 {
entry:
%local1 = alloca i32, align 4
call void @llvm.dbg.value(metadata i32 %X, metadata !12, metadata !DIExpression()), !dbg !15
%0 = bitcast i32* %local1 to i8*, !dbg !15
call void @llvm.lifetime.start.p0i8(i64 4, i8* nonnull %0), !dbg !15
call void @llvm.dbg.value(metadata i32 5, metadata !14, metadata !DIExpression()), !dbg !15
%call = tail call i32 (...) @check(), !dbg !15
%tobool = icmp eq i32 %call, 0, !dbg !15
br i1 %tobool, label %if.else, label %if.then, !dbg !15
if.then: ; preds = %entry
call void @llvm.dbg.value(metadata i32 4, metadata !13, metadata !DIExpression()), !dbg !15
store i32 4, i32* %local1, align 4, !dbg !15, !tbaa !16
call void @llvm.dbg.value(metadata i32* %local1, metadata !13, metadata !DIExpression(DW_OP_deref)), !dbg !15
%call1 = call i32 @init(i32* nonnull %local1), !dbg !15
call void @llvm.dbg.value(metadata i32 undef, metadata !14, metadata !DIExpression()), !dbg !15
br label %if.end, !dbg !15
if.else: ; preds = %entry
call void @llvm.dbg.value(metadata i32 5, metadata !13, metadata !DIExpression()), !dbg !15
store i32 5, i32* %local1, align 4, !dbg !15, !tbaa !16
br label %if.end
if.end: ; preds = %if.else, %if.then
%1 = bitcast i32* %local1 to i8*, !dbg !15
call void @llvm.dbg.value(metadata i32 undef, metadata !14, metadata !DIExpression()), !dbg !15
%call2 = call i32 (...) @init2(), !dbg !15
call void @llvm.dbg.value(metadata i32 undef, metadata !14, metadata !DIExpression()), !dbg !15
%2 = load i32, i32* %local1, align 4, !dbg !15, !tbaa !16
call void @llvm.dbg.value(metadata i32 %2, metadata !13, metadata !DIExpression()), !dbg !15
call void @llvm.lifetime.end.p0i8(i64 4, i8* nonnull %1), !dbg !15
ret i32 %2, !dbg !15
}
; Function Attrs: argmemonly nounwind
declare void @llvm.lifetime.start.p0i8(i64 immarg, i8* nocapture)
declare dso_local i32 @check(...) local_unnamed_addr
declare dso_local i32 @init(i32*) local_unnamed_addr
declare dso_local i32 @init2(...) local_unnamed_addr
; Function Attrs: argmemonly nounwind
declare void @llvm.lifetime.end.p0i8(i64 immarg, i8* nocapture)
; Function Attrs: nounwind readnone speculatable
declare void @llvm.dbg.value(metadata, metadata, metadata)
; Function Attrs: nounwind
declare void @llvm.stackprotector(i8*, i8**)
attributes #0 = { nounwind uwtable "frame-pointer"="non-leaf" }
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!3, !4, !5}
!llvm.ident = !{!6}
!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 9.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, nameTableKind: None)
!1 = !DIFile(filename: "dbg-stack-value-range.c", directory: "/")
!2 = !{}
!3 = !{i32 2, !"Dwarf Version", i32 4}
!4 = !{i32 2, !"Debug Info Version", i32 3}
!5 = !{i32 1, !"wchar_size", i32 4}
!6 = !{!"clang version 9.0.0"}
!7 = distinct !DISubprogram(name: "foo", scope: !1, file: !1, line: 11, type: !8, scopeLine: 11, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !11)
!8 = !DISubroutineType(types: !9)
!9 = !{!10, !10}
!10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
!11 = !{!12, !13, !14}
!12 = !DILocalVariable(name: "X", arg: 1, scope: !7, file: !1, line: 11, type: !10)
!13 = !DILocalVariable(name: "local1", scope: !7, file: !1, line: 12, type: !10)
!14 = !DILocalVariable(name: "local2", scope: !7, file: !1, line: 12, type: !10)
!15 = !DILocation(line: 11, column: 13, scope: !7)
!16 = !{!17, !17, i64 0}
!17 = !{!"int", !18, i64 0}
!18 = !{!"omnipotent char", !19, i64 0}
!19 = !{!"Simple C/C++ TBAA"}
...
---
name: foo
alignment: 16
frameInfo:
stackSize: 24
offsetAdjustment: -24
maxAlignment: 4
adjustsStack: true
hasCalls: true
fixedStack:
- { id: 0, type: spill-slot, offset: -16, size: 8, alignment: 16, stack-id: default,
callee-saved-register: '$r14d', callee-saved-restored: true, debug-info-variable: '',
debug-info-expression: '', debug-info-location: '' }
stack:
- { id: 0, name: local1, type: default, offset: -20, size: 4, alignment: 4,
stack-id: default, callee-saved-register: '', callee-saved-restored: true,
debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
body: |
bb.0.entry:
successors: %bb.3(0x30000000), %bb.1(0x50000000)
DBG_VALUE $edi, $noreg, !12, !DIExpression(), debug-location !15
frame-setup PUSH64r killed $rbp, implicit-def $rsp, implicit $rsp
CFI_INSTRUCTION def_cfa_offset 16
CFI_INSTRUCTION offset $rbp, -16
$rbp = frame-setup MOV64rr $rsp
CFI_INSTRUCTION def_cfa_register $rbp
$rsp = frame-setup SUB64ri8 $rsp, 16, implicit-def dead $eflags
DBG_VALUE 5, $noreg, !14, !DIExpression(), debug-location !15
$r14d = MOV32ri 4, implicit-def $r14
DBG_VALUE $r14d, $noreg, !13, !DIExpression(), debug-location !15
dead $eax = XOR32rr undef $eax, undef $eax, implicit-def dead $eflags, implicit-def $al, debug-location !15
CALL64pcrel32 @check, csr_64, implicit $rsp, implicit $ssp, implicit $al, implicit-def $rsp, implicit-def $ssp, implicit-def $eax, debug-location !15
TEST32rr killed renamable $eax, renamable $eax, implicit-def $eflags, debug-location !15
JCC_1 %bb.3, 4, implicit killed $eflags, debug-location !15
bb.1.if.then:
successors: %bb.3(0x80000000)
MOV32mr $rbp, 1, $noreg, -4, $noreg, $r14d, debug-location !15 :: (store (s32) into %ir.local1, !tbaa !16)
DBG_VALUE $rbp, $noreg, !13, !DIExpression(DW_OP_constu, 4, DW_OP_minus, DW_OP_deref), debug-location !15
renamable $rdi = LEA64r $rbp, 1, $noreg, -4, $noreg
CALL64pcrel32 @init, csr_64, implicit $rsp, implicit $ssp, implicit $rdi, implicit-def $rsp, implicit-def $ssp, implicit-def dead $eax, debug-location !15
DBG_VALUE $noreg, $noreg, !14, !DIExpression(), debug-location !15
JMP_1 %bb.3
bb.3.if.end:
DBG_VALUE $noreg, $noreg, !14, !DIExpression(), debug-location !15
dead $eax = XOR32rr undef $eax, undef $eax, implicit-def dead $eflags, implicit-def $al, debug-location !15
CALL64pcrel32 @init2, csr_64, implicit $rsp, implicit $ssp, implicit $al, implicit-def $rsp, implicit-def $ssp, implicit-def dead $eax, debug-location !15
DBG_VALUE $noreg, $noreg, !14, !DIExpression(), debug-location !15
renamable $eax = MOV32rm $rbp, 1, $noreg, -4, $noreg, debug-location !15 :: (dereferenceable load (s32) from %ir.local1, !tbaa !16)
$rsp = frame-destroy ADD64ri8 $rsp, 16, implicit-def dead $eflags, debug-location !15
$rbp = frame-destroy POP64r implicit-def $rsp, implicit $rsp, debug-location !15
CFI_INSTRUCTION def_cfa $rsp, 8, debug-location !15
RET64 $eax, debug-location !15
...
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