1 ; RUN: opt -O0 -S -mergefunc -mergefunc-preserve-debug-info < %s | FileCheck %s --check-prefix=OPTIMIZATION_LEVEL_0 2 ; RUN: opt -O2 -S -mergefunc -mergefunc-preserve-debug-info < %s | FileCheck %s --check-prefix=OPTIMIZATION_LEVEL_2 3 4 ; Preserve debug info in thunks under -mergefunc -mergefunc-preserve-debug-info 5 ; 6 ; We test that: 7 ; At -O0 we have preserved the generated @llvm.dbg.declare debug intrinsics. 8 ; At -O2 we have preserved the generated @llvm.dbg.value debug intrinsics. 9 ; At -O0, stores from the incoming parameters to locations on the stack-frame 10 ; and allocas that create these locations on the stack-frame are preserved. 11 ; Debug info got generated for the call made by the thunk and for its return value. 12 ; The foregoing is the only content of a thunk's entry block. 13 ; A thunk makes a tail call to the shared implementation. 14 ; A thunk's call site is preserved to point to the thunk (with only -mergefunc the 15 ; call site is modified to point to the shared implementation) when both occur 16 ; within the same translation unit. 17 18 ; The source code that was used to test and generate this LLVM IR is: 19 ; 20 ; int maxA(int x, int y) { 21 ; int i, m, j; 22 ; if (x > y) 23 ; m = x; 24 ; else 25 ; m = y; 26 ; return m; 27 ; } 28 ; 29 ; int maxB(int x, int y) { 30 ; int i, m, j; 31 ; if (x > y) 32 ; m = x; 33 ; else 34 ; m = y; 35 ; return m; 36 ; } 37 ; 38 ; void f(void) { 39 ; 40 ; maxA(3, 4); 41 ; maxB(1, 9); 42 ; } 43 44 ; Function Attrs: nounwind uwtable 45 define i32 @maxA(i32 %x, i32 %y) !dbg !6 { 46 entry: 47 %x.addr = alloca i32, align 4 48 %y.addr = alloca i32, align 4 49 %i = alloca i32, align 4 50 %m = alloca i32, align 4 51 %j = alloca i32, align 4 52 store i32 %x, i32* %x.addr, align 4 53 call void @llvm.dbg.declare(metadata i32* %x.addr, metadata !11, metadata !12), !dbg !13 54 store i32 %y, i32* %y.addr, align 4 55 call void @llvm.dbg.declare(metadata i32* %y.addr, metadata !14, metadata !12), !dbg !15 56 call void @llvm.dbg.declare(metadata i32* %i, metadata !16, metadata !12), !dbg !17 57 call void @llvm.dbg.declare(metadata i32* %m, metadata !18, metadata !12), !dbg !19 58 call void @llvm.dbg.declare(metadata i32* %j, metadata !20, metadata !12), !dbg !21 59 %0 = load i32, i32* %x.addr, align 4, !dbg !22 60 %1 = load i32, i32* %y.addr, align 4, !dbg !24 61 %cmp = icmp sgt i32 %0, %1, !dbg !25 62 br i1 %cmp, label %if.then, label %if.else, !dbg !26 63 64 if.then: ; preds = %entry 65 %2 = load i32, i32* %x.addr, align 4, !dbg !27 66 store i32 %2, i32* %m, align 4, !dbg !28 67 br label %if.end, !dbg !29 68 69 if.else: ; preds = %entry 70 %3 = load i32, i32* %y.addr, align 4, !dbg !30 71 store i32 %3, i32* %m, align 4, !dbg !31 72 br label %if.end 73 74 if.end: ; preds = %if.else, %if.then 75 %4 = load i32, i32* %m, align 4, !dbg !32 76 ret i32 %4, !dbg !33 77 } 78 79 ; Function Attrs: nounwind readnone 80 declare void @llvm.dbg.declare(metadata, metadata, metadata) 81 82 ; Function Attrs: nounwind uwtable 83 define i32 @maxB(i32 %x, i32 %y) !dbg !34 { 84 85 ; OPTIMIZATION_LEVEL_0: define i32 @maxB(i32 %x, i32 %y) 86 ; OPTIMIZATION_LEVEL_0-NEXT: entry: 87 ; OPTIMIZATION_LEVEL_0-NEXT: %x.addr = alloca i32, align 4 88 ; OPTIMIZATION_LEVEL_0-NEXT: %y.addr = alloca i32, align 4 89 ; OPTIMIZATION_LEVEL_0-NEXT: store i32 %x, i32* %x.addr, align 4 90 ; OPTIMIZATION_LEVEL_0-NEXT: call void @llvm.dbg.declare(metadata i32* %x.addr, metadata !{{[0-9]+}}, metadata !DIExpression()), !dbg !{{[0-9]+}} 91 ; OPTIMIZATION_LEVEL_0-NEXT: store i32 %y, i32* %y.addr, align 4 92 ; OPTIMIZATION_LEVEL_0-NEXT: call void @llvm.dbg.declare(metadata i32* %y.addr, metadata !{{[0-9]+}}, metadata !DIExpression()), !dbg !{{[0-9]+}} 93 ; OPTIMIZATION_LEVEL_0-NEXT: %0 = tail call i32 @maxA(i32 %x, i32 %y), !dbg !{{[0-9]+}} 94 ; OPTIMIZATION_LEVEL_0-NEXT: ret i32 %0, !dbg !{{[0-9]+}} 95 ; OPTIMIZATION_LEVEL_0-NEXT: } 96 97 ; OPTIMIZATION_LEVEL_2: define i32 @maxB(i32 %x, i32 %y) 98 ; OPTIMIZATION_LEVEL_2-NEXT: entry: 99 ; OPTIMIZATION_LEVEL_2-NEXT: call void @llvm.dbg.value(metadata i32 %x, metadata !{{[0-9]+}}, metadata !DIExpression()), !dbg !{{[0-9]+}} 100 ; OPTIMIZATION_LEVEL_2-NEXT: call void @llvm.dbg.value(metadata i32 %y, metadata !{{[0-9]+}}, metadata !DIExpression()), !dbg !{{[0-9]+}} 101 ; OPTIMIZATION_LEVEL_2-NEXT: %0 = tail call i32 @maxA(i32 %x, i32 %y) #{{[0-9]+}}, !dbg !{{[0-9]+}} 102 ; OPTIMIZATION_LEVEL_2-NEXT: ret i32 %0, !dbg !{{[0-9]+}} 103 ; OPTIMIZATION_LEVEL_2-NEXT: } 104 105 entry: 106 %x.addr = alloca i32, align 4 107 %y.addr = alloca i32, align 4 108 %i = alloca i32, align 4 109 %m = alloca i32, align 4 110 %j = alloca i32, align 4 111 store i32 %x, i32* %x.addr, align 4 112 call void @llvm.dbg.declare(metadata i32* %x.addr, metadata !35, metadata !12), !dbg !36 113 store i32 %y, i32* %y.addr, align 4 114 call void @llvm.dbg.declare(metadata i32* %y.addr, metadata !37, metadata !12), !dbg !38 115 call void @llvm.dbg.declare(metadata i32* %i, metadata !39, metadata !12), !dbg !40 116 call void @llvm.dbg.declare(metadata i32* %m, metadata !41, metadata !12), !dbg !42 117 call void @llvm.dbg.declare(metadata i32* %j, metadata !43, metadata !12), !dbg !44 118 %0 = load i32, i32* %x.addr, align 4, !dbg !45 119 %1 = load i32, i32* %y.addr, align 4, !dbg !47 120 %cmp = icmp sgt i32 %0, %1, !dbg !48 121 br i1 %cmp, label %if.then, label %if.else, !dbg !49 122 123 if.then: ; preds = %entry 124 %2 = load i32, i32* %x.addr, align 4, !dbg !50 125 store i32 %2, i32* %m, align 4, !dbg !51 126 br label %if.end, !dbg !52 127 128 if.else: ; preds = %entry 129 %3 = load i32, i32* %y.addr, align 4, !dbg !53 130 store i32 %3, i32* %m, align 4, !dbg !54 131 br label %if.end 132 133 if.end: ; preds = %if.else, %if.then 134 %4 = load i32, i32* %m, align 4, !dbg !55 135 ret i32 %4, !dbg !56 136 } 137 138 ; Function Attrs: nounwind uwtable 139 define void @f() !dbg !57 { 140 entry: 141 142 ; OPTIMIZATION_LEVEL_0: define void @f() 143 ; OPTIMIZATION_LEVEL_0-NEXT: entry: 144 ; OPTIMIZATION_LEVEL_0-NEXT: %call = call i32 @maxA(i32 3, i32 4), !dbg !{{[0-9]+}} 145 ; OPTIMIZATION_LEVEL_0-NEXT: %call1 = call i32 @maxB(i32 1, i32 9), !dbg !{{[0-9]+}} 146 ; OPTIMIZATION_LEVEL_0-NEXT: ret void, !dbg !{{[0-9]+}} 147 148 ; OPTIMIZATION_LEVEL_2: define void @f() 149 ; OPTIMIZATION_LEVEL_2-NEXT: entry: 150 ; OPTIMIZATION_LEVEL_2-NEXT: ret void, !dbg !{{[0-9]+}} 151 152 %call = call i32 @maxA(i32 3, i32 4), !dbg !60 153 %call1 = call i32 @maxB(i32 1, i32 9), !dbg !61 154 ret void, !dbg !62 155 } 156 157 !llvm.dbg.cu = !{!0} 158 !llvm.module.flags = !{!3, !4} 159 !llvm.ident = !{!5} 160 161 !0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2) 162 !1 = !DIFile(filename: "mergefunc-preserve-debug-info.c", directory: "") 163 !2 = !{} 164 !3 = !{i32 2, !"Dwarf Version", i32 4} 165 !4 = !{i32 2, !"Debug Info Version", i32 3} 166 !5 = !{!""} 167 !6 = distinct !DISubprogram(name: "maxA", scope: !7, file: !7, line: 1, type: !8, isLocal: false, isDefinition: true, scopeLine: 1, flags: DIFlagPrototyped, isOptimized: false, unit: !0, retainedNodes: !2) 168 !7 = !DIFile(filename: "./mergefunc-preserve-debug-info.c", directory: "") 169 !8 = !DISubroutineType(types: !9) 170 !9 = !{!10, !10, !10} 171 !10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed) 172 !11 = !DILocalVariable(name: "x", arg: 1, scope: !6, file: !7, line: 1, type: !10) 173 !12 = !DIExpression() 174 !13 = !DILocation(line: 1, column: 14, scope: !6) 175 !14 = !DILocalVariable(name: "y", arg: 2, scope: !6, file: !7, line: 1, type: !10) 176 !15 = !DILocation(line: 1, column: 21, scope: !6) 177 !16 = !DILocalVariable(name: "i", scope: !6, file: !7, line: 2, type: !10) 178 !17 = !DILocation(line: 2, column: 7, scope: !6) 179 !18 = !DILocalVariable(name: "m", scope: !6, file: !7, line: 2, type: !10) 180 !19 = !DILocation(line: 2, column: 10, scope: !6) 181 !20 = !DILocalVariable(name: "j", scope: !6, file: !7, line: 2, type: !10) 182 !21 = !DILocation(line: 2, column: 13, scope: !6) 183 !22 = !DILocation(line: 3, column: 7, scope: !23) 184 !23 = distinct !DILexicalBlock(scope: !6, file: !7, line: 3, column: 7) 185 !24 = !DILocation(line: 3, column: 11, scope: !23) 186 !25 = !DILocation(line: 3, column: 9, scope: !23) 187 !26 = !DILocation(line: 3, column: 7, scope: !6) 188 !27 = !DILocation(line: 4, column: 9, scope: !23) 189 !28 = !DILocation(line: 4, column: 7, scope: !23) 190 !29 = !DILocation(line: 4, column: 5, scope: !23) 191 !30 = !DILocation(line: 6, column: 9, scope: !23) 192 !31 = !DILocation(line: 6, column: 7, scope: !23) 193 !32 = !DILocation(line: 7, column: 10, scope: !6) 194 !33 = !DILocation(line: 7, column: 3, scope: !6) 195 !34 = distinct !DISubprogram(name: "maxB", scope: !7, file: !7, line: 10, type: !8, isLocal: false, isDefinition: true, scopeLine: 10, flags: DIFlagPrototyped, isOptimized: false, unit: !0, retainedNodes: !2) 196 !35 = !DILocalVariable(name: "x", arg: 1, scope: !34, file: !7, line: 10, type: !10) 197 !36 = !DILocation(line: 10, column: 14, scope: !34) 198 !37 = !DILocalVariable(name: "y", arg: 2, scope: !34, file: !7, line: 10, type: !10) 199 !38 = !DILocation(line: 10, column: 21, scope: !34) 200 !39 = !DILocalVariable(name: "i", scope: !34, file: !7, line: 11, type: !10) 201 !40 = !DILocation(line: 11, column: 7, scope: !34) 202 !41 = !DILocalVariable(name: "m", scope: !34, file: !7, line: 11, type: !10) 203 !42 = !DILocation(line: 11, column: 10, scope: !34) 204 !43 = !DILocalVariable(name: "j", scope: !34, file: !7, line: 11, type: !10) 205 !44 = !DILocation(line: 11, column: 13, scope: !34) 206 !45 = !DILocation(line: 12, column: 7, scope: !46) 207 !46 = distinct !DILexicalBlock(scope: !34, file: !7, line: 12, column: 7) 208 !47 = !DILocation(line: 12, column: 11, scope: !46) 209 !48 = !DILocation(line: 12, column: 9, scope: !46) 210 !49 = !DILocation(line: 12, column: 7, scope: !34) 211 !50 = !DILocation(line: 13, column: 9, scope: !46) 212 !51 = !DILocation(line: 13, column: 7, scope: !46) 213 !52 = !DILocation(line: 13, column: 5, scope: !46) 214 !53 = !DILocation(line: 15, column: 9, scope: !46) 215 !54 = !DILocation(line: 15, column: 7, scope: !46) 216 !55 = !DILocation(line: 16, column: 10, scope: !34) 217 !56 = !DILocation(line: 16, column: 3, scope: !34) 218 !57 = distinct !DISubprogram(name: "f", scope: !7, file: !7, line: 19, type: !58, isLocal: false, isDefinition: true, scopeLine: 19, flags: DIFlagPrototyped, isOptimized: false, unit: !0, retainedNodes: !2) 219 !58 = !DISubroutineType(types: !59) 220 !59 = !{null} 221 !60 = !DILocation(line: 21, column: 3, scope: !57) 222 !61 = !DILocation(line: 22, column: 3, scope: !57) 223 !62 = !DILocation(line: 23, column: 1, scope: !57) 224
