xref: /llvm-project/llvm/test/DebugInfo/ARM/instr-ref-tcreturn.ll (revision d53425e2a33a0ff7336c86d3f668b1855c47a6de)
18612417eSJeremy Morse; RUN: llc %s -o - -stop-after=finalize-isel -verify-machineinstrs -experimental-debug-variable-locations | FileCheck %s
28612417eSJeremy Morse
38612417eSJeremy Morse; In the sequence below, the sdiv is converted to a function call to __divsi3,
48612417eSJeremy Morse; which is then tail call optimised. The dbg.value is suddenly stuck between
58612417eSJeremy Morse; terminators, and the corresponding DBG_INSTR_REF is forced-placed to be
68612417eSJeremy Morse; immediately before the TCRETURN.
78612417eSJeremy Morse; However, with the function having the sspstrong attribute, we then try to
88612417eSJeremy Morse; peel apart the terminator sequence, DBG_INSTR_REF is interpreted as being
98612417eSJeremy Morse; a "real" instruction, and the stack check is inserted at that point rather
108612417eSJeremy Morse; than before the copies-to-physreg setting up the call. This breaks the
118612417eSJeremy Morse; code, and MachineVerifier complains.
128612417eSJeremy Morse;
138612417eSJeremy Morse; Check that the tail sequence is stack-protected, and split at the correct
148612417eSJeremy Morse; position, ignoring the DBG_INSTR_REF
158612417eSJeremy Morse
168612417eSJeremy Morsetarget datalayout = "e-m:o-p:32:32-Fi8-f64:32:64-v64:32:64-v128:32:128-a:0:32-n32-S32"
178612417eSJeremy Morsetarget triple = "thumbv7-apple-ios7.0.0"
188612417eSJeremy Morse
198612417eSJeremy Morse; CHECK-LABEL:  bb.0.entry:
208612417eSJeremy Morse; CHECK:        LOAD_STACK_GUARD
218612417eSJeremy Morse
228612417eSJeremy Morse; CHECK-LABEL:  bb.2.entry:
238612417eSJeremy Morse; CHECK:        tBL {{.*}} &__stack_chk_fail,
248612417eSJeremy Morse
258612417eSJeremy Morse; CHECK-LABEL:  bb.1.entry:
268612417eSJeremy Morse; CHECK:          $r0 = COPY %0
278612417eSJeremy Morse; CHECK-NEXT:     $r1 = COPY %1
28*e10e9363SStephen Tozer; CHECK-NEXT:     DBG_INSTR_REF {{.+}}, dbg-instr-ref(1, 0)
29a86cfaeaSDavid Green; CHECK-NEXT:     TCRETURNdi &__divsi3, 0, csr_ios, implicit $sp, implicit $r0, implicit $r1
308612417eSJeremy Morse
318612417eSJeremy Morsedeclare i1 @ext()
328612417eSJeremy Morse
338612417eSJeremy Morsedefine i32 @test(i32 %a1, i32 %a2) #1 !dbg !5 {
348612417eSJeremy Morseentry:
358612417eSJeremy Morse  %foo = alloca i32, i32 %a1
368612417eSJeremy Morse  %bool = call i1 @ext()
378612417eSJeremy Morse  %res = sdiv i32 %a1, %a2
388612417eSJeremy Morse  call void @llvm.dbg.value(metadata i32 %a1, metadata !13, metadata !DIExpression()), !dbg !16
398612417eSJeremy Morse  ret i32 %res
408612417eSJeremy Morse}
418612417eSJeremy Morse
428612417eSJeremy Morseattributes #1 = {sspstrong}
438612417eSJeremy Morse
448612417eSJeremy Morse; Function Attrs: nounwind readnone speculatable willreturn
458612417eSJeremy Morsedeclare void @llvm.dbg.value(metadata, metadata, metadata)
468612417eSJeremy Morse
478612417eSJeremy Morse!llvm.dbg.cu = !{!0}
488612417eSJeremy Morse!llvm.module.flags = !{!3, !4}
498612417eSJeremy Morse
508612417eSJeremy Morse!0 = distinct !DICompileUnit(language: DW_LANG_Swift, file: !1, producer: "Swift", isOptimized: true, runtimeVersion: 5, emissionKind: FullDebug)
518612417eSJeremy Morse!1 = !DIFile(filename: "foo.swift", directory: "/tmp")
528612417eSJeremy Morse!2 = !{}
538612417eSJeremy Morse!3 = !{i32 2, !"Debug Info Version", i32 3}
548612417eSJeremy Morse!4 = !{i32 1, !"Swift Minor Version", i8 3}
558612417eSJeremy Morse!5 = distinct !DISubprogram(name: "n0", linkageName: "n1", scope: !7, file: !6, line: 86, type: !8, scopeLine: 86, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0)
568612417eSJeremy Morse!6 = !DIFile(filename: "bar.swift", directory: "")
578612417eSJeremy Morse!7 = !DIModule(scope: null, name: "Swift")
588612417eSJeremy Morse!8 = !DISubroutineType(types: !9)
598612417eSJeremy Morse!9 = !{!10, !12}
608612417eSJeremy Morse!10 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "Int", scope: !7, file: !11, size: 32, elements: !2, runtimeLang: DW_LANG_Swift, identifier: "$i1")
618612417eSJeremy Morse!11 = !DIFile(filename: "f1.swift", directory: "")
628612417eSJeremy Morse!12 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "n2", scope: !7, file: !6, size: 32, elements: !2, runtimeLang: DW_LANG_Swift, identifier: "n3")
638612417eSJeremy Morse!13 = !DILocalVariable(name: "n4", scope: !14, file: !1, line: 89, type: !15)
648612417eSJeremy Morse!14 = distinct !DILexicalBlock(scope: !5, file: !6, line: 86, column: 34)
658612417eSJeremy Morse!15 = !DIDerivedType(tag: DW_TAG_const_type, baseType: !10)
668612417eSJeremy Morse!16 = !DILocation(line: 89, column: 9, scope: !14)
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