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b056aa798d
Move the specialized metadata nodes for the new debug info hierarchy
into place, finishing off PR22464. I've done bootstraps (and all that)
and I'm confident this commit is NFC as far as DWARF output is
concerned. Let me know if I'm wrong :).
The code changes are fairly mechanical:
- Bumped the "Debug Info Version".
- `DIBuilder` now creates the appropriate subclass of `MDNode`.
- Subclasses of DIDescriptor now expect to hold their "MD"
counterparts (e.g., `DIBasicType` expects `MDBasicType`).
- Deleted a ton of dead code in `AsmWriter.cpp` and `DebugInfo.cpp`
for printing comments.
- Big update to LangRef to describe the nodes in the new hierarchy.
Feel free to make it better.
Testcase changes are enormous. There's an accompanying clang commit on
its way.
If you have out-of-tree debug info testcases, I just broke your build.
- `upgrade-specialized-nodes.sh` is attached to PR22564. I used it to
update all the IR testcases.
- Unfortunately I failed to find way to script the updates to CHECK
lines, so I updated all of these by hand. This was fairly painful,
since the old CHECKs are difficult to reason about. That's one of
the benefits of the new hierarchy.
This work isn't quite finished, BTW. The `DIDescriptor` subclasses are
almost empty wrappers, but not quite: they still have loose casting
checks (see the `RETURN_FROM_RAW()` macro). Once they're completely
gutted, I'll rename the "MD" classes to "DI" and kill the wrappers. I
also expect to make a few schema changes now that it's easier to reason
about everything.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@231082 91177308-0d34-0410-b5e6-96231b3b80d8
82 lines
3.6 KiB
LLVM
82 lines
3.6 KiB
LLVM
; REQUIRES: object-emission
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; RUN: %llc_dwarf -O0 -filetype=obj < %s | llvm-dwarfdump -debug-dump=info - | FileCheck %s
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; Built from the following source with clang -O1
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; struct S { int i; };
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; int function(struct S s, int i) { return s.i + i; }
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; Due to the X86_64 ABI, 's' is passed in registers and once optimized, the
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; entirety of 's' is never reconstituted, since only the int is required, and
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; thus the variable's location is unknown/dead to debug info.
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; Future/current work should enable us to describe partial variables, which, in
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; this case, happens to be the entire variable.
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; CHECK: DW_TAG_subprogram
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; CHECK-NOT: DW_TAG
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; CHECK: DW_AT_name {{.*}} "function"
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; CHECK-NOT: {{DW_TAG|NULL}}
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; CHECK: DW_TAG_formal_parameter
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; CHECK-NOT: DW_TAG
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; CHECK: DW_AT_name {{.*}} "s"
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; CHECK-NOT: DW_TAG
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; FIXME: Even though 's' is never reconstituted into a struct, the one member
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; variable is still live and used, and so we should be able to describe 's's
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; location as the location of that int.
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; CHECK-NOT: DW_AT_location
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; CHECK-NOT: {{DW_TAG|NULL}}
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; CHECK: DW_TAG_formal_parameter
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; CHECK-NOT: DW_TAG
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; CHECK: DW_AT_location
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; CHECK-NOT: DW_TAG
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; CHECK: DW_AT_name {{.*}} "i"
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%struct.S = type { i32 }
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; Function Attrs: nounwind readnone uwtable
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define i32 @_Z8function1Si(i32 %s.coerce, i32 %i) #0 {
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entry:
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tail call void @llvm.dbg.declare(metadata %struct.S* undef, metadata !14, metadata !MDExpression()), !dbg !20
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tail call void @llvm.dbg.value(metadata i32 %i, i64 0, metadata !15, metadata !MDExpression()), !dbg !20
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%add = add nsw i32 %i, %s.coerce, !dbg !20
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ret i32 %add, !dbg !20
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}
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; Function Attrs: nounwind readnone
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declare void @llvm.dbg.declare(metadata, metadata, metadata) #1
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; Function Attrs: nounwind readnone
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declare void @llvm.dbg.value(metadata, i64, metadata, metadata) #1
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attributes #0 = { nounwind readnone uwtable "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
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attributes #1 = { nounwind readnone }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!16, !17}
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!llvm.ident = !{!18}
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!0 = !MDCompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.5.0 ", isOptimized: true, emissionKind: 1, file: !1, enums: !2, retainedTypes: !3, subprograms: !8, globals: !2, imports: !2)
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!1 = !MDFile(filename: "dead-argument-order.cpp", directory: "/tmp/dbginfo")
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!2 = !{}
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!3 = !{!4}
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!4 = !MDCompositeType(tag: DW_TAG_structure_type, name: "S", line: 1, size: 32, align: 32, file: !1, elements: !5, identifier: "_ZTS1S")
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!5 = !{!6}
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!6 = !MDDerivedType(tag: DW_TAG_member, name: "i", line: 1, size: 32, align: 32, file: !1, scope: !"_ZTS1S", baseType: !7)
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!7 = !MDBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!8 = !{!9}
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!9 = !MDSubprogram(name: "function", linkageName: "_Z8function1Si", line: 2, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: true, scopeLine: 2, file: !1, scope: !10, type: !11, function: i32 (i32, i32)* @_Z8function1Si, variables: !13)
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!10 = !MDFile(filename: "dead-argument-order.cpp", directory: "/tmp/dbginfo")
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!11 = !MDSubroutineType(types: !12)
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!12 = !{!7, !4, !7}
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!13 = !{!14, !15}
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!14 = !MDLocalVariable(tag: DW_TAG_arg_variable, name: "s", line: 2, arg: 1, scope: !9, file: !10, type: !"_ZTS1S")
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!15 = !MDLocalVariable(tag: DW_TAG_arg_variable, name: "i", line: 2, arg: 2, scope: !9, file: !10, type: !7)
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!16 = !{i32 2, !"Dwarf Version", i32 4}
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!17 = !{i32 2, !"Debug Info Version", i32 3}
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!18 = !{!"clang version 3.5.0 "}
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!19 = !{%struct.S* undef}
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!20 = !MDLocation(line: 2, scope: !9)
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