1; RUN: llc -mtriple=x86_64-unknown-unknown -start-after=codegenprepare -stop-before=finalize-isel %s -o - | FileCheck %s 2 3; Test the movement of dbg.values of arguments. SelectionDAG tries to be 4; helpful and places DBG_VALUEs of Arguments at the start of functions. 5; Unfortunately, this doesn't necessarily make sense, as one can specify an 6; Argument IR Value as a variable location anywhere in the program. 7; 8; Distinguish cases where we want to hoist DBG_VALUEs, and those where we 9; don't, by whether the referred to variable is a parameter to the current 10; function. In the test below, 'xyzzy' is a parameter to an inlined function, 11; but should not be hoisted to the start of the function. 12; 13; Original test case, in which 'xyzzy' became unavailable because its DBG_VALUE 14; landed far from any uses, compiled "clang -O2 -g" with inlining, 15; 16; int ext(void); 17; 18; int 19; foo(int xyzzy) 20; { 21; xyzzy = ext() * xyzzy; 22; xyzzy += 1; 23; ext(); 24; return xyzzy; 25; } 26; 27; int 28; bar(int baz, int qux) 29; { 30; int fish; 31; switch (qux) { 32; case 12: fish = 8; break; 33; case 848: fish = 0; break; 34; case 99999: fish = -1; break; 35; default: fish = 12; 36; } 37; qux %= fish; 38; qux += foo(baz); 39; return qux; 40; } 41 42; CHECK: [[BAZVAR:![0-9]+]] = !DILocalVariable(name: "baz", 43; CHECK: [[XYZVAR:![0-9]+]] = !DILocalVariable(name: "xyzzy", 44 45; Start of MIR function block, 46; CHECK-LABEL: body 47; Expect DBG_VALUE of physreg, 48; CHECK: DBG_VALUE $edi, $noreg, [[BAZVAR]] 49; Expect DBG_VALUE of virtreg, 50; CHECK: DBG_VALUE [[ARGREG:%[0-9]+]], $noreg, [[BAZVAR]] 51; Label for next block, 52; CHECK-LABEL: bb.1.next 53; Correctly place dbg.value in the 'next' block. 54; CHECK: DBG_VALUE [[ARGREG]], $noreg, [[XYZVAR]] 55 56target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128" 57target triple = "x86_64-unknown-linux-gnu" 58 59declare i32 @ext() 60 61define dso_local i32 @bar(i32, i32) local_unnamed_addr !dbg !7 { 62 %3 = srem i32 %1, %0, !dbg !15 63 call void @llvm.dbg.value(metadata i32 %0, metadata !12, metadata !DIExpression()), !dbg !16 64 br label %next 65 66next: ; preds = %2 67 call void @llvm.dbg.value(metadata i32 %0, metadata !17, metadata !DIExpression()), !dbg !22 68 %4 = tail call i32 @ext(), !dbg !24 69 %5 = mul nsw i32 %3, %4, !dbg !25 70 %6 = add i32 %5, %0, !dbg !25 71 ret i32 %6, !dbg !25 72} 73 74; Function Attrs: nounwind readnone speculatable 75declare void @llvm.dbg.value(metadata, metadata, metadata) 76 77!llvm.dbg.cu = !{!0} 78!llvm.module.flags = !{!3, !4, !5} 79!llvm.ident = !{!6} 80 81!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, globals: !2, nameTableKind: None) 82!1 = !DIFile(filename: "test.c", directory: ".") 83!2 = !{} 84!3 = !{i32 2, !"Dwarf Version", i32 4} 85!4 = !{i32 2, !"Debug Info Version", i32 3} 86!5 = !{i32 1, !"wchar_size", i32 4} 87!6 = !{!"clang version 8.0.0"} 88!7 = distinct !DISubprogram(name: "bar", scope: !1, file: !1, line: 19, type: !8, scopeLine: 20, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !11) 89!8 = !DISubroutineType(types: !9) 90!9 = !{!10, !10, !10} 91!10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed) 92!11 = !{!12} 93!12 = !DILocalVariable(name: "baz", arg: 1, scope: !7, file: !1, line: 19, type: !10) 94!15 = !DILocation(line: 35, column: 7, scope: !7) 95!16 = !DILocation(line: 19, column: 9, scope: !7) 96!17 = !DILocalVariable(name: "xyzzy", arg: 1, scope: !18, file: !1, line: 10, type: !10) 97!18 = distinct !DISubprogram(name: "foo", scope: !1, file: !1, line: 10, type: !19, scopeLine: 11, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !21) 98!19 = !DISubroutineType(types: !20) 99!20 = !{!10, !10} 100!21 = !{!17} 101!22 = !DILocation(line: 10, column: 9, scope: !18, inlinedAt: !23) 102!23 = distinct !DILocation(line: 36, column: 10, scope: !7) 103!24 = !DILocation(line: 12, column: 11, scope: !18, inlinedAt: !23) 104!25 = !DILocation(line: 37, column: 3, scope: !7) 105