1# RUN: llc -run-pass=livedebugvalues -march=x86-64 -o - %s | FileCheck %s
2
3# Test the extension of debug ranges from predecessors.
4# Generated from the source file LiveDebugValues.c:
5# #include <stdio.h>
6# int m;
7# extern int inc(int n);
8# extern int change(int n);
9# extern int modify(int n);
10# int main(int argc, char **argv) {
11#   int n;
12#   if (argc != 2)
13#     n = 2;
14#   else
15#     n = atoi(argv[1]);
16#   n = change(n);
17#   if (n > 10) {
18#     m = modify(n);
19#     m = m + n;  // var `m' doesn't has a dbg.value
20#   }
21#   else
22#     m = inc(n); // var `m' doesn't has a dbg.value
23#   printf("m(main): %d\n", m);
24#   return 0;
25# }
26# with clang -g -O3 -c -emit-llvm LiveDebugValues.c -S -o live-debug-values.ll
27# then llc -stop-after stackmap-liveness live-debug-values.ll -o /dev/null > live-debug-values.mir
28# This case will also produce multiple locations but only the debug range
29# extension is tested here. This test case is tested with DWARF information under
30# llvm/test/DebugInfo/live-debug-values.ll and present here for testing under
31# MIR->MIR serialization.
32
33# DBG_VALUE for variable "n" is extended into %bb.5 from its predecessors %bb.3
34# and %bb.4.
35# CHECK: ![[N_VAR:[0-9]+]] = !DILocalVariable(name: "n",{{.*}})
36#
37# CHECK:      bb.5.if.end.7:
38# CHECK:        DBG_VALUE $ebx, $noreg, ![[N_VAR]], !DIExpression()
39
40
41--- |
42  ; ModuleID = 'live-debug-values.ll'
43  target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
44  target triple = "x86_64-unknown-linux-gnu"
45
46  @m = common global i32 0, align 4, !dbg !16
47  @.str = private unnamed_addr constant [13 x i8] c"m(main): %d\0A\00", align 1
48
49  ; Function Attrs: nounwind uwtable
50  define i32 @main(i32 %argc, i8** nocapture readonly %argv) #0 !dbg !4 {
51  entry:
52    tail call void @llvm.dbg.value(metadata i32 %argc, i64 0, metadata !12, metadata !20), !dbg !21
53    tail call void @llvm.dbg.value(metadata i8** %argv, i64 0, metadata !13, metadata !20), !dbg !22
54    %cmp = icmp eq i32 %argc, 2, !dbg !24
55    br i1 %cmp, label %if.else, label %if.end, !dbg !26
56
57  if.else:                                          ; preds = %entry
58    %arrayidx = getelementptr inbounds i8*, i8** %argv, i64 1, !dbg !27
59    %0 = load i8*, i8** %arrayidx, align 8, !dbg !27, !tbaa !28
60    %call = tail call i32 (i8*, ...) bitcast (i32 (...)* @atoi to i32 (i8*, ...)*)(i8* %0) #4, !dbg !32
61    tail call void @llvm.dbg.value(metadata i32 %call, i64 0, metadata !14, metadata !20), !dbg !33
62    br label %if.end
63
64  if.end:                                           ; preds = %if.else, %entry
65    %n.0 = phi i32 [ %call, %if.else ], [ 2, %entry ]
66    %call1 = tail call i32 @change(i32 %n.0) #4, !dbg !34
67    tail call void @llvm.dbg.value(metadata i32 %call1, i64 0, metadata !14, metadata !20), !dbg !33
68    %cmp2 = icmp sgt i32 %call1, 10, !dbg !35
69    br i1 %cmp2, label %if.then.3, label %if.else.5, !dbg !37
70
71  if.then.3:                                        ; preds = %if.end
72    %call4 = tail call i32 @modify(i32 %call1) #4, !dbg !38
73    %add = add nsw i32 %call4, %call1, !dbg !40
74    br label %if.end.7, !dbg !41
75
76  if.else.5:                                        ; preds = %if.end
77    %call6 = tail call i32 @inc(i32 %call1) #4, !dbg !42
78    br label %if.end.7
79
80  if.end.7:                                         ; preds = %if.else.5, %if.then.3
81    %storemerge = phi i32 [ %call6, %if.else.5 ], [ %add, %if.then.3 ]
82    store i32 %storemerge, i32* @m, align 4, !dbg !43, !tbaa !44
83    %call8 = tail call i32 (i8*, ...) @printf(i8* nonnull getelementptr inbounds ([13 x i8], [13 x i8]* @.str, i64 0, i64 0), i32 %storemerge) #4, !dbg !46
84    ret i32 0, !dbg !47
85  }
86
87  declare i32 @atoi(...) #1
88
89  declare i32 @change(i32) #1
90
91  declare i32 @modify(i32) #1
92
93  declare i32 @inc(i32) #1
94
95  ; Function Attrs: nounwind
96  declare i32 @printf(i8* nocapture readonly, ...) #2
97
98  ; Function Attrs: nounwind readnone
99  declare void @llvm.dbg.value(metadata, i64, metadata, metadata) #3
100
101  attributes #0 = { nounwind uwtable }
102  attributes #1 = { nounwind }
103  attributes #2 = { nounwind }
104  attributes #3 = { nounwind readnone }
105  attributes #4 = { nounwind }
106
107  !llvm.dbg.cu = !{!0}
108  !llvm.module.flags = !{!17, !18}
109  !llvm.ident = !{!19}
110
111  !0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 3.8.0 (trunk 253049) ", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, globals: !15)
112  !1 = !DIFile(filename: "LiveDebugValues.c", directory: "/home/vt/julia/test/tvvikram")
113  !2 = !{}
114  !4 = distinct !DISubprogram(name: "main", scope: !1, file: !1, line: 6, type: !5, isLocal: false, isDefinition: true, scopeLine: 6, flags: DIFlagPrototyped, isOptimized: true, unit: !0, retainedNodes: !11)
115  !5 = !DISubroutineType(types: !6)
116  !6 = !{!7, !7, !8}
117  !7 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
118  !8 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !9, size: 64, align: 64)
119  !9 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !10, size: 64, align: 64)
120  !10 = !DIBasicType(name: "char", size: 8, align: 8, encoding: DW_ATE_signed_char)
121  !11 = !{!12, !13, !14}
122  !12 = !DILocalVariable(name: "argc", arg: 1, scope: !4, file: !1, line: 6, type: !7)
123  !13 = !DILocalVariable(name: "argv", arg: 2, scope: !4, file: !1, line: 6, type: !8)
124  !14 = !DILocalVariable(name: "n", scope: !4, file: !1, line: 7, type: !7)
125  !15 = !{!16}
126  !16 = !DIGlobalVariableExpression(var: !DIGlobalVariable(name: "m", scope: !0, file: !1, line: 2, type: !7, isLocal: false, isDefinition: true), expr: !DIExpression())
127  !17 = !{i32 2, !"Dwarf Version", i32 4}
128  !18 = !{i32 2, !"Debug Info Version", i32 3}
129  !19 = !{!"clang version 3.8.0 (trunk 253049)"}
130  !20 = !DIExpression()
131  !21 = !DILocation(line: 6, column: 14, scope: !4)
132  !22 = !DILocation(line: 6, column: 27, scope: !23)
133  !23 = !DILexicalBlockFile(scope: !4, file: !1, discriminator: 1)
134  !24 = !DILocation(line: 8, column: 12, scope: !25)
135  !25 = distinct !DILexicalBlock(scope: !4, file: !1, line: 8, column: 7)
136  !26 = !DILocation(line: 8, column: 7, scope: !4)
137  !27 = !DILocation(line: 11, column: 14, scope: !25)
138  !28 = !{!29, !29, i64 0}
139  !29 = !{!"any pointer", !30, i64 0}
140  !30 = !{!"omnipotent char", !31, i64 0}
141  !31 = !{!"Simple C/C++ TBAA"}
142  !32 = !DILocation(line: 11, column: 9, scope: !25)
143  !33 = !DILocation(line: 7, column: 7, scope: !23)
144  !34 = !DILocation(line: 12, column: 7, scope: !4)
145  !35 = !DILocation(line: 13, column: 9, scope: !36)
146  !36 = distinct !DILexicalBlock(scope: !4, file: !1, line: 13, column: 7)
147  !37 = !DILocation(line: 13, column: 7, scope: !4)
148  !38 = !DILocation(line: 14, column: 9, scope: !39)
149  !39 = distinct !DILexicalBlock(scope: !36, file: !1, line: 13, column: 15)
150  !40 = !DILocation(line: 15, column: 11, scope: !39)
151  !41 = !DILocation(line: 16, column: 3, scope: !39)
152  !42 = !DILocation(line: 18, column: 9, scope: !36)
153  !43 = !DILocation(line: 15, column: 7, scope: !39)
154  !44 = !{!45, !45, i64 0}
155  !45 = !{!"int", !30, i64 0}
156  !46 = !DILocation(line: 19, column: 3, scope: !4)
157  !47 = !DILocation(line: 20, column: 3, scope: !4)
158
159...
160---
161name:            main
162alignment:       16
163exposesReturnsTwice: false
164tracksRegLiveness: true
165liveins:
166  - { reg: '$edi' }
167  - { reg: '$rsi' }
168calleeSavedRegisters: [ '$bh', '$bl', '$bp', '$bpl', '$bx', '$ebp', '$ebx',
169                        '$rbp', '$rbx', '$r12', '$r13', '$r14', '$r15',
170                        '$r12b', '$r13b', '$r14b', '$r15b', '$r12d', '$r13d',
171                        '$r14d', '$r15d', '$r12w', '$r13w', '$r14w', '$r15w' ]
172frameInfo:
173  isFrameAddressTaken: false
174  isReturnAddressTaken: false
175  hasStackMap:     false
176  hasPatchPoint:   false
177  stackSize:       8
178  offsetAdjustment: 0
179  maxAlignment:    0
180  adjustsStack:    true
181  hasCalls:        true
182  maxCallFrameSize: 0
183  hasOpaqueSPAdjustment: false
184  hasVAStart:      false
185  hasMustTailInVarArgFunc: false
186fixedStack:
187  - { id: 0, type: spill-slot, offset: -16, size: 8, alignment: 16, callee-saved-register: '$rbx' }
188body:             |
189  bb.0.entry:
190    successors: %bb.1.if.else(16), %bb.2.if.end(16)
191    liveins: $edi, $rsi, $rbx
192
193    frame-setup PUSH64r killed $rbx, implicit-def $rsp, implicit $rsp
194    CFI_INSTRUCTION def_cfa_offset 16
195    CFI_INSTRUCTION offset $rbx, -16
196    DBG_VALUE $edi, _, !12, !20, debug-location !21
197    DBG_VALUE $rsi, _, !13, !20, debug-location !22
198    $eax = MOV32rr $edi
199    DBG_VALUE $eax, _, !12, !20, debug-location !21
200    $edi = MOV32ri 2
201    CMP32ri8 killed $eax, 2, implicit-def $eflags, debug-location !26
202    JCC_1 %bb.2.if.end, 5, implicit $eflags
203
204  bb.1.if.else:
205    successors: %bb.2.if.end(0)
206    liveins: $rsi
207
208    DBG_VALUE $rsi, _, !13, !20, debug-location !22
209    $rdi = MOV64rm killed $rsi, 1, _, 8, _, debug-location !27 :: (load (s64) from %ir.arrayidx, !tbaa !28)
210    dead $eax = XOR32rr undef $eax, undef $eax, implicit-def dead $eflags, implicit-def $al, debug-location !32
211    CALL64pcrel32 @atoi, csr_64, implicit $rsp, implicit $rdi, implicit $al, implicit-def $rsp, implicit-def $eax, debug-location !32
212    $edi = MOV32rr $eax, debug-location !32
213    DBG_VALUE $edi, _, !14, !20, debug-location !33
214
215  bb.2.if.end:
216    successors: %bb.3.if.then.3(16), %bb.4.if.else.5(16)
217    liveins: $edi
218
219    CALL64pcrel32 @change, csr_64, implicit $rsp, implicit $edi, implicit-def $rsp, implicit-def $eax, debug-location !34
220    $ebx = MOV32rr $eax, debug-location !34
221    DBG_VALUE $ebx, _, !14, !20, debug-location !33
222    CMP32ri8 $ebx, 11, implicit-def $eflags, debug-location !37
223    JCC_1 %bb.4.if.else.5, 12, implicit killed $eflags, debug-location !37
224
225  bb.3.if.then.3:
226    successors: %bb.5.if.end.7(0)
227    liveins: $ebx
228
229    DBG_VALUE $ebx, _, !14, !20, debug-location !33
230    $edi = MOV32rr $ebx, debug-location !38
231    CALL64pcrel32 @modify, csr_64, implicit $rsp, implicit $edi, implicit-def $rsp, implicit-def $eax, debug-location !38
232    $ecx = MOV32rr $eax, debug-location !38
233    $ecx = ADD32rr killed $ecx, killed $ebx, implicit-def dead $eflags, debug-location !40
234    JMP_1 %bb.5.if.end.7
235
236  bb.4.if.else.5:
237    successors: %bb.5.if.end.7(0)
238    liveins: $ebx
239
240    DBG_VALUE $ebx, _, !14, !20, debug-location !33
241    $edi = MOV32rr killed $ebx, debug-location !42
242    CALL64pcrel32 @inc, csr_64, implicit $rsp, implicit $edi, implicit-def $rsp, implicit-def $eax, debug-location !42
243    $ecx = MOV32rr $eax, debug-location !42
244
245  bb.5.if.end.7:
246    liveins: $ecx
247
248    MOV32mr $rip, 1, _, @m, _, $ecx, debug-location !43 :: (store (s32) into @m, !tbaa !44)
249    dead undef $edi = MOV32ri @.str, implicit-def $rdi, debug-location !46
250    dead $eax = XOR32rr undef $eax, undef $eax, implicit-def dead $eflags, implicit-def $al, debug-location !47
251    $esi = MOV32rr killed $ecx, debug-location !46
252    CALL64pcrel32 @printf, csr_64, implicit $rsp, implicit $rdi, implicit $esi, implicit $al, implicit-def $rsp, implicit-def dead $eax, debug-location !46
253    $eax = XOR32rr undef $eax, undef $eax, implicit-def dead $eflags, debug-location !47
254    $rbx = POP64r implicit-def $rsp, implicit $rsp, debug-location !47
255    RETQ $eax, debug-location !47
256
257...
258