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
4 ; Preserve debug info in thunks under -mergefunc -mergefunc-preserve-debug-info
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.
18 ; The source code that was used to test and generate this LLVM IR is:
20 ; int maxA(int x, int y) {
29 ; int maxB(int x, int y) {
44 ; Function Attrs: nounwind uwtable
45 define i32 @maxA(i32 %x, i32 %y) !dbg !6 {
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
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
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
74 if.end: ; preds = %if.else, %if.then
75 %4 = load i32, i32* %m, align 4, !dbg !32
79 ; Function Attrs: nounwind readnone
80 declare void @llvm.dbg.declare(metadata, metadata, metadata)
82 ; Function Attrs: nounwind uwtable
83 define i32 @maxB(i32 %x, i32 %y) !dbg !34 {
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: }
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: }
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
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
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
133 if.end: ; preds = %if.else, %if.then
134 %4 = load i32, i32* %m, align 4, !dbg !55
138 ; Function Attrs: nounwind uwtable
139 define void @f() !dbg !57 {
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]+}}
148 ; OPTIMIZATION_LEVEL_2: define void @f()
149 ; OPTIMIZATION_LEVEL_2-NEXT: entry:
150 ; OPTIMIZATION_LEVEL_2-NEXT: ret void, !dbg !{{[0-9]+}}
152 %call = call i32 @maxA(i32 3, i32 4), !dbg !60
153 %call1 = call i32 @maxB(i32 1, i32 9), !dbg !61
158 !llvm.module.flags = !{!3, !4}
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: "")
164 !3 = !{i32 2, !"Dwarf Version", i32 4}
165 !4 = !{i32 2, !"Debug Info Version", i32 3}
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)
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)