[DebugInfo][AIX] Set target debugger-tune default to dbx

https://reviews.llvm.org/D99400 set clang DefaultDebuggerTuning for AIX
to dbx. However, we still need to update the target default so that llc
and other tools will get the same default debuggertuning, and avoid
passing extra options in LTO.

Reviewed By: #powerpc, shchenz, dblaikie

Differential Revision: https://reviews.llvm.org/D101197

Author: Jinsong Ji

llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp

@@ -362,6 +362,8 @@ DwarfDebug::DwarfDebug(AsmPrinter *A)
     DebuggerTuning = DebuggerKind::LLDB;
   else if (TT.isPS4CPU())
     DebuggerTuning = DebuggerKind::SCE;
+  else if (TT.isOSAIX())
+    DebuggerTuning = DebuggerKind::DBX;
   else
     DebuggerTuning = DebuggerKind::GDB;
 

llvm/test/DebugInfo/PowerPC/debugger-tune.ll

@@ -0,0 +1,41 @@
+; Verify target-based defaults for "debugger tuning," and the ability to
+; override defaults.
+; We use the use of DW_FORM_string (rather than DW_FORM_strp) to distinguish the debugger tuning.
+
+; Verify defaults for various targets.
+; RUN: llc -mtriple=powerpc64le-unknown-linux -filetype=obj < %s | llvm-dwarfdump -debug-info --show-form - | FileCheck --check-prefix=GDB %s --implicit-check-not DW_FORM_string
+; TODO: Use -filetype-obj and llvm-dwarfdump when the obj mode is supported.
+; RUN: llc -mtriple=powerpc64-ibm-aix-xcoff < %s | FileCheck --check-prefix=DBX --implicit-check-not DW_FROM_strp %s
+
+; We can override defaults.
+; RUN: llc -mtriple=powerpc64le-unknown-linux -filetype=obj -debugger-tune=dbx < %s | llvm-dwarfdump -debug-info --show-form - | FileCheck --check-prefix=DBX %s --implicit-check-not DW_FROM_strp
+; RUN: llc -mtriple=powerpc64-ibm-aix-xcoff -debugger-tune=gdb < %s | FileCheck --check-prefix=GDB %s --implicit-check-not DW_FORM_string
+
+; GDB: DW_FORM_strp
+; DBX: DW_FORM_string
+
+; Function Attrs: noinline nounwind optnone
+define i32 @main() #0 !dbg !8 {
+entry:
+  %retval = alloca i32, align 4
+  store i32 0, i32* %retval, align 4
+  ret i32 0, !dbg !12
+}
+
+!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 version 12.0.0", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, nameTableKind: None)
+!1 = !DIFile(filename: "1.c", directory: "debug")
+!2 = !{}
+!3 = !{i32 7, !"Dwarf Version", i32 4}
+!4 = !{i32 2, !"Debug Info Version", i32 3}
+!5 = !{i32 1, !"wchar_size", i32 2}
+!6 = !{i32 7, !"PIC Level", i32 2}
+!7 = !{!"clang version 12.0.0"}
+!8 = distinct !DISubprogram(name: "main", scope: !1, file: !1, line: 1, type: !9, scopeLine: 2, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !2)
+!9 = !DISubroutineType(types: !10)
+!10 = !{!11}
+!11 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
+!12 = !DILocation(line: 3, column: 3, scope: !8)

llvm/test/DebugInfo/XCOFF/empty.ll

@@ -1,7 +1,7 @@
 
-; RUN: llc -mtriple powerpc-ibm-aix-xcoff < %s | \
+; RUN: llc -debugger-tune=gdb -mtriple powerpc-ibm-aix-xcoff < %s | \
 ; RUN:   FileCheck %s --check-prefix=ASM32
-; RUN: llc -mtriple powerpc64-ibm-aix-xcoff < %s | \
+; RUN: llc -debugger-tune=gdb -mtriple powerpc64-ibm-aix-xcoff < %s | \
 ; RUN:   FileCheck %s --check-prefix=ASM64
 
 source_filename = "1.c"

llvm/test/DebugInfo/XCOFF/explicit-section.ll

@@ -1,5 +1,5 @@
 
-; RUN: llc -mtriple powerpc-ibm-aix-xcoff < %s | \
+; RUN: llc -debugger-tune=gdb -mtriple powerpc-ibm-aix-xcoff < %s | \
 ; RUN:   FileCheck %s
 
 source_filename = "2.c"

llvm/test/DebugInfo/XCOFF/function-sections.ll

@@ -1,5 +1,5 @@
 
-; RUN: llc -mtriple powerpc-ibm-aix-xcoff -function-sections \
+; RUN: llc -debugger-tune=gdb -mtriple powerpc-ibm-aix-xcoff -function-sections \
 ; RUN:   < %s | FileCheck %s
 
 source_filename = "1.c"