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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
69 lines
3.0 KiB
LLVM
69 lines
3.0 KiB
LLVM
;; Test mips:
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; RUN: llc -mtriple=mips-linux-gnu -emit-call-site-info %s -stop-after=finalize-isel -o -| FileCheck %s
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;; Test mipsel:
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; RUN: llc -mtriple=mipsel-linux-gnu -emit-call-site-info %s -stop-after=finalize-isel -o -| FileCheck %s
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;; Verify that call site info is not emitted for parameter passed through 64-bit register $d
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;; which splits into two 32-bit physical regs.
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;; Source:
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;; extern double bar(double,int);
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;; double foo(double self){
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;; int b = 1;
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;; double a = bar(self,b);
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;; return a;
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;; }
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;; Test mips and mipsel:
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; CHECK: name: foo
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; CHECK: callSites:
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; CHECK-NEXT: bb: {{.*}}, offset: {{.*}}, fwdArgRegs:
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; CHECK-NOT: arg: 0, reg: '$a0'
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; CHECK-NOT: arg: 0, reg: '$d6'
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; CHECK-NEXT: arg: 1, reg: '$a2'
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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 double @foo(double %self) local_unnamed_addr !dbg !13 {
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entry:
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call void @llvm.dbg.value(metadata double %self, metadata !17, metadata !DIExpression()), !dbg !20
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call void @llvm.dbg.value(metadata i32 1, metadata !18, metadata !DIExpression()), !dbg !20
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%call = tail call double @bar(double %self, i32 signext 1), !dbg !20
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call void @llvm.dbg.value(metadata double %call, metadata !19, metadata !DIExpression()), !dbg !20
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ret double %call, !dbg !20
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}
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declare !dbg !4 dso_local double @bar(double, 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 = !{!9, !10, !11}
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!llvm.ident = !{!12}
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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: "bar", 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, !8}
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!7 = !DIBasicType(name: "double", size: 64, encoding: DW_ATE_float)
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!8 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
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!9 = !{i32 7, !"Dwarf Version", i32 4}
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!10 = !{i32 2, !"Debug Info Version", i32 3}
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!11 = !{i32 1, !"wchar_size", i32 4}
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!12 = !{!"clang version 11.0.0"}
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!13 = distinct !DISubprogram(name: "foo", scope: !1, file: !1, line: 3, type: !14, scopeLine: 3, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !16)
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!14 = !DISubroutineType(types: !15)
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!15 = !{!7, !7}
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!16 = !{!17, !18, !19}
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!17 = !DILocalVariable(name: "self", arg: 1, scope: !13, file: !1, line: 3, type: !7)
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!18 = !DILocalVariable(name: "b", scope: !13, file: !1, line: 4, type: !8)
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!19 = !DILocalVariable(name: "a", scope: !13, file: !1, line: 5, type: !7)
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!20 = !DILocation(line: 0, scope: !13)
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