DebugInfo: Add flag to CU to disable emission of inline debug info into the skeleton CU

In cases where .dwo/.dwp files are guaranteed to be available, skipping
the extra online (in the .o file) inline info can save a substantial
amount of space - see the original r221306 for more details there.

llvm-svn: 279650

2 files changed, 44 insertions, 3 deletions

diff --git a/llvm/test/Assembler/dicompileunit.ll b/llvm/test/Assembler/dicompileunit.ll
index 994beff3b24..c1683e2d630 100644
--- a/llvm/test/Assembler/dicompileunit.ll
+++ b/llvm/test/Assembler/dicompileunit.ll
@@ -22,18 +22,18 @@
                              splitDebugFilename: "abc.debug",
                              emissionKind: FullDebug,
                              enums: !2, retainedTypes: !3,
-                             globals: !5, imports: !6, macros: !7, dwoId: 42)
+                             globals: !5, imports: !6, macros: !7, dwoId: 42, splitDebugInlining: true)
 
 ; CHECK: !9 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, isOptimized: false, runtimeVersion: 0, emissionKind: NoDebug)
 !9 = distinct !DICompileUnit(language: 12, file: !1, producer: "",
                              isOptimized: false, flags: "", runtimeVersion: 0,
                              splitDebugFilename: "", emissionKind: NoDebug)
 
-; CHECK: !10 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang", isOptimized: true, flags: "-O2", runtimeVersion: 2, splitDebugFilename: "abc.debug", emissionKind: LineTablesOnly)
+; CHECK: !10 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang", isOptimized: true, flags: "-O2", runtimeVersion: 2, splitDebugFilename: "abc.debug", emissionKind: LineTablesOnly, splitDebugInlining: false)
 !10 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang",
                              isOptimized: true, flags: "-O2", runtimeVersion: 2,
                              splitDebugFilename: "abc.debug",
-                             emissionKind: LineTablesOnly)
+                             emissionKind: LineTablesOnly, splitDebugInlining: false)
 
 !llvm.module.flags = !{!11}
 !11 = !{i32 2, !"Debug Info Version", i32 3}
diff --git a/llvm/test/DebugInfo/X86/fission-no-inlining.ll b/llvm/test/DebugInfo/X86/fission-no-inlining.ll
new file mode 100644
index 00000000000..3f1e087f9ba
--- /dev/null
+++ b/llvm/test/DebugInfo/X86/fission-no-inlining.ll
@@ -0,0 +1,41 @@
+; RUN: llc -split-dwarf=Enable -O0 < %s -mtriple=x86_64-unknown-linux-gnu -filetype=obj | llvm-dwarfdump -debug-dump=info - | FileCheck %s
+
+; CHECK-NOT: DW_TAG_subprogram
+
+; IR generated from the following source:
+; void f1();
+; inline __attribute__((always_inline)) void f2() {
+;   f1();
+; }
+; void f3() {
+;   f2();
+; }
+
+; Function Attrs: uwtable
+define void @_Z2f3v() #0 !dbg !5 {
+entry:
+  call void @_Z2f1v(), !dbg !8
+  ret void, !dbg !11
+}
+
+declare void @_Z2f1v() #1
+
+attributes #0 = { uwtable "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-jump-tables"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+fxsr,+mmx,+sse,+sse2,+x87" "unsafe-fp-math"="false" "use-soft-float"="false" }
+attributes #1 = { "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+fxsr,+mmx,+sse,+sse2,+x87" "unsafe-fp-math"="false" "use-soft-float"="false" }
+
+!llvm.dbg.cu = !{!0}
+!llvm.module.flags = !{!3}
+!llvm.ident = !{!4}
+
+!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "clang version 4.0.0 (trunk 279571) (llvm/trunk 279602)", isOptimized: false, runtimeVersion: 0, splitDebugFilename: "fission-no-inlining.dwo", emissionKind: FullDebug, enums: !2, splitDebugInlining: false)
+!1 = !DIFile(filename: "fission-no-inlining.cpp", directory: "/tmp/dbginfo")
+!2 = !{}
+!3 = !{i32 2, !"Debug Info Version", i32 3}
+!4 = !{!"clang version 4.0.0 (trunk 279571) (llvm/trunk 279602)"}
+!5 = distinct !DISubprogram(name: "f3", linkageName: "_Z2f3v", scope: !1, file: !1, line: 5, type: !6, isLocal: false, isDefinition: true, scopeLine: 5, flags: DIFlagPrototyped, isOptimized: false, unit: !0, variables: !2)
+!6 = !DISubroutineType(types: !7)
+!7 = !{null}
+!8 = !DILocation(line: 3, column: 3, scope: !9, inlinedAt: !10)
+!9 = distinct !DISubprogram(name: "f2", linkageName: "_Z2f2v", scope: !1, file: !1, line: 2, type: !6, isLocal: false, isDefinition: true, scopeLine: 2, flags: DIFlagPrototyped, isOptimized: false, unit: !0, variables: !2)
+!10 = distinct !DILocation(line: 6, column: 3, scope: !5)
+!11 = !DILocation(line: 7, column: 1, scope: !5)