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llvm-project/llvm/test/DebugInfo/X86/sdag-dbgvalue-phi-use-1.ll
Stephen Tozer e10e936315 [DebugInfo][NFC] Add new MachineOperand type and change DBG_INSTR_REF syntax 
This patch makes two notable changes to the MIR debug info representation,
which result in different MIR output but identical final DWARF output (NFC
w.r.t. the full compilation). The two changes are:

  * The introduction of a new MachineOperand type, MO_DbgInstrRef, which
    consists of two unsigned numbers that are used to index an instruction
    and an output operand within that instruction, having a meaning
    identical to first two operands of the current DBG_INSTR_REF
    instruction. This operand is only used in DBG_INSTR_REF (see below).
  * A change in syntax for the DBG_INSTR_REF instruction, shuffling the
    operands to make it resemble DBG_VALUE_LIST instead of DBG_VALUE,
    and replacing the first two operands with a single MO_DbgInstrRef-type
    operand.

This patch is the first of a set that will allow DBG_INSTR_REF
instructions to refer to multiple machine locations in the same manner
as DBG_VALUE_LIST.

Reviewed By: jmorse

Differential Revision: https://reviews.llvm.org/D129372
2023-01-06 18:03:48 +00:00

191 lines
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; RUN: llc -start-after=codegenprepare -stop-before finalize-isel -o - %s \
; RUN: -experimental-debug-variable-locations=false \
; RUN: | FileCheck %s --check-prefixes=CHECK,DBGVALUE
; RUN: llc -start-after=codegenprepare -stop-before finalize-isel -o - %s \
; RUN: -experimental-debug-variable-locations=true \
; RUN: | FileCheck %s --check-prefixes=CHECK,INSTRREF
; This test case was generated from the following debug.c program,
; using: clang debug.c -g -O1 -S -o dbg_value_phi_isel1.ll -emit-llvm
; --------------------------------------
; int end = 10;
;
; int main() {
; int x = 9;
; int y = 13;
; for (int u = 0; u < end; ++u) {
; x += y;
; y = y * 3;
; }
;
; volatile int arr[80];
; for (int q = 0; q < 64; ++q) {
; arr[q] = q + 3;
; }
;
; return x;
; }
; --------------------------------------
;
; ModuleID = 'debug.c'
source_filename = "debug.c"
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
@end = dso_local local_unnamed_addr global i32 10, align 4, !dbg !0
; Function Attrs: nounwind uwtable
define dso_local i32 @main() local_unnamed_addr #0 !dbg !11 {
; CHECK-LABEL: name: main
entry:
%arr = alloca [80 x i32], align 16
call void @llvm.dbg.value(metadata i32 9, metadata !15, metadata !DIExpression()), !dbg !26
call void @llvm.dbg.value(metadata i32 13, metadata !16, metadata !DIExpression()), !dbg !27
call void @llvm.dbg.value(metadata i32 0, metadata !17, metadata !DIExpression()), !dbg !28
%0 = load i32, ptr @end, align 4, !dbg !29, !tbaa !31
%cmp20 = icmp sgt i32 %0, 0, !dbg !35
br i1 %cmp20, label %for.body.lr.ph, label %for.cond.cleanup, !dbg !36
for.body.lr.ph: ; preds = %entry
%1 = load i32, ptr @end, align 4, !tbaa !31
br label %for.body, !dbg !36
for.cond.cleanup: ; preds = %for.body, %entry
; CHECK-LABEL: bb.{{.*}}.for.cond.cleanup:
; CHECK: [[REG1:%[0-9]+]]:gr32 = PHI
; INSTRREF-SAME: debug-instr-number 7
; INSTRREF-NEXT: DBG_INSTR_REF {{.+}}, dbg-instr-ref(7, 0)
; DBGVALUE-NEXT: DBG_VALUE [[REG1]]
%x.0.lcssa = phi i32 [ 9, %entry ], [ %add, %for.body ]
call void @llvm.dbg.value(metadata i32 %x.0.lcssa, metadata !15, metadata !DIExpression()), !dbg !26
call void @llvm.lifetime.start.p0(i64 320, ptr nonnull %arr) #3, !dbg !37
call void @llvm.dbg.declare(metadata ptr %arr, metadata !19, metadata !DIExpression()), !dbg !38
call void @llvm.dbg.value(metadata i32 0, metadata !24, metadata !DIExpression()), !dbg !39
br label %for.body4, !dbg !40
for.body: ; preds = %for.body.lr.ph, %for.body
; CHECK-LABEL: bb.{{.*}}.for.body:
; CHECK: [[REG2:%[0-9]+]]:gr32 = PHI
; INSTRREF-SAME: debug-instr-number 3
; CHECK-NEXT: [[REG3:%[0-9]+]]:gr32 = PHI
; INSTRREF-SAME: debug-instr-number 4
; CHECK-NEXT: [[REG4:%[0-9]+]]:gr32 = PHI
; INSTRREF-SAME: debug-instr-number 5
; INSTRREF-NEXT: DBG_INSTR_REF {{.+}}, dbg-instr-ref(3, 0)
; INSTRREF-NEXT: DBG_INSTR_REF {{.+}}, dbg-instr-ref(4, 0)
; INSTRREF-NEXT: DBG_INSTR_REF {{.+}}, dbg-instr-ref(5, 0)
; DBGVALUE-NEXT: DBG_VALUE [[REG2]]
; DBGVALUE-NEXT: DBG_VALUE [[REG3]]
; DBGVALUE-NEXT: DBG_VALUE [[REG4]]
%u.023 = phi i32 [ 0, %for.body.lr.ph ], [ %inc, %for.body ]
%y.022 = phi i32 [ 13, %for.body.lr.ph ], [ %mul, %for.body ]
%x.021 = phi i32 [ 9, %for.body.lr.ph ], [ %add, %for.body ]
call void @llvm.dbg.value(metadata i32 %u.023, metadata !17, metadata !DIExpression()), !dbg !28
call void @llvm.dbg.value(metadata i32 %y.022, metadata !16, metadata !DIExpression()), !dbg !27
call void @llvm.dbg.value(metadata i32 %x.021, metadata !15, metadata !DIExpression()), !dbg !26
%add = add nuw nsw i32 %y.022, %x.021, !dbg !41
%mul = mul nsw i32 %y.022, 3, !dbg !43
%inc = add nuw nsw i32 %u.023, 1, !dbg !44
call void @llvm.dbg.value(metadata i32 %inc, metadata !17, metadata !DIExpression()), !dbg !28
call void @llvm.dbg.value(metadata i32 %mul, metadata !16, metadata !DIExpression()), !dbg !27
call void @llvm.dbg.value(metadata i32 %add, metadata !15, metadata !DIExpression()), !dbg !26
%cmp = icmp slt i32 %inc, %1, !dbg !35
br i1 %cmp, label %for.body, label %for.cond.cleanup, !dbg !36, !llvm.loop !45
for.cond.cleanup3: ; preds = %for.body4
call void @llvm.lifetime.end.p0(i64 320, ptr nonnull %arr) #3, !dbg !47
ret i32 %x.0.lcssa, !dbg !48
for.body4: ; preds = %for.body4, %for.cond.cleanup
%indvars.iv = phi i64 [ 0, %for.cond.cleanup ], [ %indvars.iv.next, %for.body4 ]
call void @llvm.dbg.value(metadata i64 %indvars.iv, metadata !24, metadata !DIExpression()), !dbg !39
%arrayidx = getelementptr inbounds [80 x i32], ptr %arr, i64 0, i64 %indvars.iv, !dbg !49
%2 = trunc i64 %indvars.iv to i32, !dbg !52
%3 = add i32 %2, 3, !dbg !52
store volatile i32 %3, ptr %arrayidx, align 4, !dbg !52, !tbaa !31
%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1, !dbg !53
call void @llvm.dbg.value(metadata i32 undef, metadata !24, metadata !DIExpression(DW_OP_plus_uconst, 1, DW_OP_stack_value)), !dbg !39
%exitcond = icmp eq i64 %indvars.iv.next, 64, !dbg !54
br i1 %exitcond, label %for.cond.cleanup3, label %for.body4, !dbg !40, !llvm.loop !55
}
; Function Attrs: argmemonly nounwind
declare void @llvm.lifetime.start.p0(i64, ptr nocapture) #1
; Function Attrs: nounwind readnone speculatable
declare void @llvm.dbg.declare(metadata, metadata, metadata) #2
; Function Attrs: argmemonly nounwind
declare void @llvm.lifetime.end.p0(i64, ptr nocapture) #1
; Function Attrs: nounwind readnone speculatable
declare void @llvm.dbg.value(metadata, metadata, metadata) #2
attributes #0 = { nounwind uwtable }
attributes #1 = { argmemonly nounwind }
attributes #2 = { nounwind readnone speculatable }
attributes #3 = { nounwind }
!llvm.dbg.cu = !{!2}
!llvm.module.flags = !{!7, !8, !9}
!llvm.ident = !{!10}
!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
!1 = distinct !DIGlobalVariable(name: "end", scope: !2, file: !3, line: 1, type: !6, isLocal: false, isDefinition: true)
!2 = distinct !DICompileUnit(language: DW_LANG_C99, file: !3, producer: "clang version 7.0.0 (x)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5)
!3 = !DIFile(filename: "debug.c", directory: "")
!4 = !{}
!5 = !{!0}
!6 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
!7 = !{i32 2, !"Dwarf Version", i32 4}
!8 = !{i32 2, !"Debug Info Version", i32 3}
!9 = !{i32 1, !"wchar_size", i32 4}
!10 = !{!"clang version 7.0.0 (x)"}
!11 = distinct !DISubprogram(name: "main", scope: !3, file: !3, line: 3, type: !12, isLocal: false, isDefinition: true, scopeLine: 3, isOptimized: true, unit: !2, retainedNodes: !14)
!12 = !DISubroutineType(types: !13)
!13 = !{!6}
!14 = !{!15, !16, !17, !19, !24}
!15 = !DILocalVariable(name: "x", scope: !11, file: !3, line: 4, type: !6)
!16 = !DILocalVariable(name: "y", scope: !11, file: !3, line: 5, type: !6)
!17 = !DILocalVariable(name: "u", scope: !18, file: !3, line: 6, type: !6)
!18 = distinct !DILexicalBlock(scope: !11, file: !3, line: 6, column: 3)
!19 = !DILocalVariable(name: "arr", scope: !11, file: !3, line: 11, type: !20)
!20 = !DICompositeType(tag: DW_TAG_array_type, baseType: !21, size: 2560, elements: !22)
!21 = !DIDerivedType(tag: DW_TAG_volatile_type, baseType: !6)
!22 = !{!23}
!23 = !DISubrange(count: 80)
!24 = !DILocalVariable(name: "q", scope: !25, file: !3, line: 12, type: !6)
!25 = distinct !DILexicalBlock(scope: !11, file: !3, line: 12, column: 3)
!26 = !DILocation(line: 4, column: 7, scope: !11)
!27 = !DILocation(line: 5, column: 7, scope: !11)
!28 = !DILocation(line: 6, column: 12, scope: !18)
!29 = !DILocation(line: 6, column: 23, scope: !30)
!30 = distinct !DILexicalBlock(scope: !18, file: !3, line: 6, column: 3)
!31 = !{!32, !32, i64 0}
!32 = !{!"int", !33, i64 0}
!33 = !{!"omnipotent char", !34, i64 0}
!34 = !{!"Simple C/C++ TBAA"}
!35 = !DILocation(line: 6, column: 21, scope: !30)
!36 = !DILocation(line: 6, column: 3, scope: !18)
!37 = !DILocation(line: 11, column: 3, scope: !11)
!38 = !DILocation(line: 11, column: 16, scope: !11)
!39 = !DILocation(line: 12, column: 12, scope: !25)
!40 = !DILocation(line: 12, column: 3, scope: !25)
!41 = !DILocation(line: 7, column: 7, scope: !42)
!42 = distinct !DILexicalBlock(scope: !30, file: !3, line: 6, column: 33)
!43 = !DILocation(line: 8, column: 11, scope: !42)
!44 = !DILocation(line: 6, column: 28, scope: !30)
!45 = distinct !{!45, !36, !46}
!46 = !DILocation(line: 9, column: 3, scope: !18)
!47 = !DILocation(line: 17, column: 1, scope: !11)
!48 = !DILocation(line: 16, column: 3, scope: !11)
!49 = !DILocation(line: 13, column: 5, scope: !50)
!50 = distinct !DILexicalBlock(scope: !51, file: !3, line: 12, column: 32)
!51 = distinct !DILexicalBlock(scope: !25, file: !3, line: 12, column: 3)
!52 = !DILocation(line: 13, column: 12, scope: !50)
!53 = !DILocation(line: 12, column: 27, scope: !51)
!54 = !DILocation(line: 12, column: 21, scope: !51)
!55 = distinct !{!55, !40, !56}
!56 = !DILocation(line: 14, column: 3, scope: !25)
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