[llvm] r335153 - [MachineOutliner] Add debug info test for the outliner

[Jessica Paquette via llvm-commits]

Author: paquette
Date: Wed Jun 20 11:41:11 2018
New Revision: 335153

URL: http://llvm.org/viewvc/llvm-project?rev=335153&view=rev
Log:
[MachineOutliner] Add debug info test for the outliner

The outliner emits debug info. Add a test that outlines a function
and uses llvm-dwarfdump to check the emitted DWARF for correctness.

Added:
    llvm/trunk/test/DebugInfo/AArch64/machine-outliner.ll

Added: llvm/trunk/test/DebugInfo/AArch64/machine-outliner.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/DebugInfo/AArch64/machine-outliner.ll?rev=335153&view=auto
==============================================================================
--- llvm/trunk/test/DebugInfo/AArch64/machine-outliner.ll (added)
+++ llvm/trunk/test/DebugInfo/AArch64/machine-outliner.ll Wed Jun 20 11:41:11 2018
@@ -0,0 +1,85 @@
+; RUN: llc -O0 -verify-machineinstrs -filetype=obj -mtriple=aarch64-- \
+; RUN: -enable-machine-outliner < %s | llvm-dwarfdump - | FileCheck %s
+
+; Ensure that the MachineOutliner produces valid DWARF when it creates outlined
+; functions. Check that the outlined function has a subprogram, and that the
+; expected DWARF attributes are present.
+
+; The outlined function appears after bar. Skip past the functions we don't
+; care about.
+; CHECK: DW_TAG_compile_unit
+; CHECK-DAG: DW_AT_name	("foo")
+; CHECK-DAG: DW_AT_name	("p")
+
+; Check the high address of bar. This is one past the end of bar. It should be
+; the beginning of the outlined function.
+; CHECK:      DW_AT_high_pc	([[ONE_PAST_BAR:0x[a-f0-9]+]])
+; CHECK-NEXT: DW_AT_frame_base	(DW_OP_reg29 W29)
+; CHECK-NEXT: DW_AT_name	("bar")
+
+; Check the outlined function's DWARF.
+; CHECK-DAG:  DW_TAG_subprogram
+; CHECK-NEXT: DW_AT_low_pc	([[ONE_PAST_BAR]])
+; CHECK-NEXT: DW_AT_high_pc	(0x{{[0-9a-f]+}})
+; CHECK-NEXT: DW_AT_frame_base	(DW_OP_reg29 W29)
+; CHECK-NEXT: DW_AT_MIPS_linkage_name	("[[NAME:OUTLINED_FUNCTION_[0-9]+]]")
+; CHECK-NEXT: DW_AT_name	("[[NAME]]")
+; CHECK-NEXT: DW_AT_artificial	(0x01)
+; CHECK-NEXT: DW_AT_external	(0x01)
+
+define void @foo() #0 !dbg !8 {
+entry:
+  %p = alloca i32*, align 8
+  call void @llvm.dbg.declare(metadata i32** %p, metadata !11, metadata !DIExpression()), !dbg !14
+  %0 = load i32*, i32** %p, align 8, !dbg !15
+  %incdec.ptr = getelementptr inbounds i32, i32* %0, i32 1, !dbg !15
+  store i32* %incdec.ptr, i32** %p, align 8, !dbg !15
+  call void @foo(), !dbg !16
+  ret void, !dbg !17
+}
+
+declare void @llvm.dbg.declare(metadata, metadata, metadata) #1
+
+define void @bar() #0 !dbg !18 {
+entry:
+  %p = alloca i32*, align 8
+  call void @llvm.dbg.declare(metadata i32** %p, metadata !19, metadata !DIExpression()), !dbg !20
+  %0 = load i32*, i32** %p, align 8, !dbg !21
+  %incdec.ptr = getelementptr inbounds i32, i32* %0, i32 1, !dbg !21
+  store i32* %incdec.ptr, i32** %p, align 8, !dbg !21
+  call void @foo(), !dbg !22
+  ret void, !dbg !23
+}
+
+attributes #0 = { nounwind ssp uwtable "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" }
+attributes #1 = { nounwind readnone speculatable }
+
+!llvm.dbg.cu = !{!0}
+!llvm.module.flags = !{!3, !4, !5, !6}
+!llvm.ident = !{!7}
+
+!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
+!1 = !DIFile(filename: "something.c", directory: "somewhere")
+!2 = !{}
+!3 = !{i32 2, !"Dwarf Version", i32 2}
+!4 = !{i32 2, !"Debug Info Version", i32 3}
+!5 = !{i32 1, !"wchar_size", i32 4}
+!6 = !{i32 7, !"PIC Level", i32 2}
+!7 = !{!"clang"}
+!8 = distinct !DISubprogram(name: "foo", scope: !1, file: !1, line: 1, type: !9, isLocal: false, isDefinition: true, scopeLine: 1, flags: DIFlagPrototyped, isOptimized: false, unit: !0, retainedNodes: !2)
+!9 = !DISubroutineType(types: !10)
+!10 = !{null}
+!11 = !DILocalVariable(name: "p", scope: !8, file: !1, line: 2, type: !12)
+!12 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !13, size: 64)
+!13 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
+!14 = !DILocation(line: 2, column: 8, scope: !8)
+!15 = !DILocation(line: 3, column: 4, scope: !8)
+!16 = !DILocation(line: 4, column: 3, scope: !8)
+!17 = !DILocation(line: 5, column: 1, scope: !8)
+!18 = distinct !DISubprogram(name: "bar", scope: !1, file: !1, line: 7, type: !9, isLocal: false, isDefinition: true, scopeLine: 8, flags: DIFlagPrototyped, isOptimized: false, unit: !0, retainedNodes: !2)
+!19 = !DILocalVariable(name: "p", scope: !18, file: !1, line: 9, type: !12)
+!20 = !DILocation(line: 9, column: 8, scope: !18)
+!21 = !DILocation(line: 10, column: 4, scope: !18)
+!22 = !DILocation(line: 11, column: 3, scope: !18)
+!23 = !DILocation(line: 12, column: 1, scope: !18)
+