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74e4e285b0
Debug entry values functionality provides debug information about call sites and function parameters values at the call entry spot. Condition for generating this type of information is compiling with -g option and optimization level higher than zero(-O0). In ISEL phase, while lowering call instructions, collect info about registers that forward arguments into following function frame. We store such info into MachineFunction of the caller function. This is used very late, when dumping DWARF info about call site parameters. The call site info is visible at MIR level, as callSites attribute of MachineFunction. Also, when using unmodified parameter value inside callee it could be described as DW_OP_entry_value expression. To deal with callSites attribute, we should pass -emit-call-site-info option to llc. This patch enables functionality in clang frontend and adds call site info generation support for MIPS targets (mips, mipsel, mips64, mips64el). Patch by Nikola Tesic Differential Revision: https://reviews.llvm.org/D78105
77 lines
3.6 KiB
LLVM
77 lines
3.6 KiB
LLVM
;; Test mips32:
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; RUN: llc -emit-call-site-info -stop-after=livedebugvalues -mtriple=mips-linux-gnu -o - %s | FileCheck %s
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;; Test mipsel:
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; RUN: llc -emit-call-site-info -stop-after=livedebugvalues -mtriple=mipsel-linux-gnu -o - %s | FileCheck %s --check-prefix=CHECKel
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;; Built from source:
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;; extern long fn1(long,long,long);
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;; long fn2(long a, long b, long c) {
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;; long local = fn1(a+b, c, b+10);
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;; if (local > 10)
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;; return local + 10;
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;; return b;
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;; }
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;; Using command:
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;; clang -g -O2 -target mips-linux-gnu m.c -c -S -emit-llvm
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;; Confirm that info from callSites attribute is used as entry_value in DIExpression.
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;; Test mips32:
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; CHECK: $a0 = nsw ADDu $a1, killed renamable $a0,
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; CHECK-NEXT: DBG_VALUE $a0, $noreg, !14, !DIExpression(DW_OP_LLVM_entry_value, 1)
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;; Test mipsel:
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; CHECKel: $a0 = nsw ADDu $a1, killed renamable $a0,
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; CHECKel-NEXT: DBG_VALUE $a0, $noreg, !14, !DIExpression(DW_OP_LLVM_entry_value, 1)
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; ModuleID = 'm.c'
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source_filename = "m.c"
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target datalayout = "E-m:m-p:32:32-i8:8:32-i16:16:32-i64:64-n32-S64"
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target triple = "mips-unknown-linux-gnu"
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; Function Attrs: nounwind
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define dso_local i32 @fn2(i32 signext %a, i32 signext %b, i32 signext %c) local_unnamed_addr !dbg !12 {
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entry:
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call void @llvm.dbg.value(metadata i32 %a, metadata !14, metadata !DIExpression()), !dbg !18
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call void @llvm.dbg.value(metadata i32 %b, metadata !15, metadata !DIExpression()), !dbg !18
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call void @llvm.dbg.value(metadata i32 %c, metadata !16, metadata !DIExpression()), !dbg !18
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%add = add nsw i32 %b, %a, !dbg !18
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%add1 = add nsw i32 %b, 10, !dbg !18
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%call = tail call i32 @fn1(i32 signext %add, i32 signext %c, i32 signext %add1), !dbg !18
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call void @llvm.dbg.value(metadata i32 %call, metadata !17, metadata !DIExpression()), !dbg !18
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%cmp = icmp sgt i32 %call, 10, !dbg !22
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%add2 = add nsw i32 %call, 10, !dbg !18
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%retval.0 = select i1 %cmp, i32 %add2, i32 %b, !dbg !18
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ret i32 %retval.0, !dbg !18
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}
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declare !dbg !4 dso_local i32 @fn1(i32 signext, i32 signext, i32 signext) local_unnamed_addr
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; Function Attrs: nounwind readnone speculatable willreturn
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declare void @llvm.dbg.value(metadata, metadata, metadata)
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!8, !9, !10}
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!llvm.ident = !{!11}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 11.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, retainedTypes: !3, splitDebugInlining: false, nameTableKind: None)
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!1 = !DIFile(filename: "m.c", directory: "/dir")
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!2 = !{}
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!3 = !{!4}
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!4 = !DISubprogram(name: "fn1", scope: !1, file: !1, line: 1, type: !5, flags: DIFlagPrototyped, spFlags: DISPFlagOptimized, retainedNodes: !2)
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!5 = !DISubroutineType(types: !6)
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!6 = !{!7, !7, !7, !7}
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!7 = !DIBasicType(name: "long int", size: 32, encoding: DW_ATE_signed)
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!8 = !{i32 7, !"Dwarf Version", i32 4}
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!9 = !{i32 2, !"Debug Info Version", i32 3}
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!10 = !{i32 1, !"wchar_size", i32 4}
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!11 = !{!"clang version 11.0.0"}
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!12 = distinct !DISubprogram(name: "fn2", scope: !1, file: !1, line: 2, type: !5, scopeLine: 2, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !13)
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!13 = !{!14, !15, !16, !17}
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!14 = !DILocalVariable(name: "a", arg: 1, scope: !12, file: !1, line: 2, type: !7)
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!15 = !DILocalVariable(name: "b", arg: 2, scope: !12, file: !1, line: 2, type: !7)
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!16 = !DILocalVariable(name: "c", arg: 3, scope: !12, file: !1, line: 2, type: !7)
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!17 = !DILocalVariable(name: "local", scope: !12, file: !1, line: 3, type: !7)
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!18 = !DILocation(line: 0, scope: !12)
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!22 = !DILocation(line: 4, column: 13, scope: !23)
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!23 = distinct !DILexicalBlock(scope: !12, file: !1, line: 4, column: 7)
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