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8d1b74869c
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.
llvm-svn: 231082
96 lines
4.6 KiB
LLVM
96 lines
4.6 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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; Testing that two distinct (distinct by writing them in separate files, while
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; still fulfilling C++'s ODR by having identical token sequences) functions,
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; linked under LTO, get plausible debug info (and don't crash).
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; Built from source:
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; $ clang++ a.cpp b.cpp -g -c -emit-llvm
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; $ llvm-link a.bc b.bc -o ab.bc
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; This change is intended to tickle a case where the subprogram MDNode
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; associated with the llvm::Function will differ from the subprogram
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; referenced by the DbgLocs in the function.
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; $ sed -ie "s/!12, !0/!0, !12/" ab.ll
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; $ cat a.cpp
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; inline int func(int i) {
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; return i * 2;
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; }
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; int (*x)(int) = &func;
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; $ cat b.cpp
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; inline int func(int i) {
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; return i * 2;
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; }
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; int (*y)(int) = &func;
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; CHECK: DW_TAG_compile_unit
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; CHECK: DW_TAG_subprogram
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; CHECK-NOT: DW_TAG
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; CHECK: DW_AT_name {{.*}} "func"
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; CHECK: DW_TAG_compile_unit
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; FIXME: Maybe we should drop the subprogram here - since the function was
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; emitted in one CU, due to linkonce_odr uniquing. We certainly don't emit the
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; subprogram here if the source location for this definition is the same (see
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; test/DebugInfo/cross-cu-linkonce.ll), though it's very easy to tickle that
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; into failing even without duplicating the source as has been done in this
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; case (two cpp files in different directories, including the same header that
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; contains an inline function - clang will produce distinct subprogram metadata
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; that won't deduplicate owing to the file location information containing the
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; directory of the source file even though the file name is absolute, not
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; relative)
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; CHECK: DW_TAG_subprogram
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@x = global i32 (i32)* @_Z4funci, align 8
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@y = global i32 (i32)* @_Z4funci, align 8
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; Function Attrs: inlinehint nounwind uwtable
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define linkonce_odr i32 @_Z4funci(i32 %i) #0 {
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%1 = alloca i32, align 4
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store i32 %i, i32* %1, align 4
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call void @llvm.dbg.declare(metadata i32* %1, metadata !22, metadata !MDExpression()), !dbg !23
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%2 = load i32, i32* %1, align 4, !dbg !24
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%3 = mul nsw i32 %2, 2, !dbg !24
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ret i32 %3, !dbg !24
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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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attributes #0 = { inlinehint nounwind uwtable "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" "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 = !{!12, !0}
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!llvm.module.flags = !{!19, !20}
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!llvm.ident = !{!21, !21}
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!0 = !MDCompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.5.0 ", isOptimized: false, emissionKind: 1, file: !1, enums: !2, retainedTypes: !2, subprograms: !3, globals: !9, imports: !2)
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!1 = !MDFile(filename: "a.cpp", directory: "/tmp/dbginfo")
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!2 = !{}
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!3 = !{!4}
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!4 = !MDSubprogram(name: "func", linkageName: "_Z4funci", line: 1, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, scopeLine: 1, file: !1, scope: !5, type: !6, function: i32 (i32)* @_Z4funci, variables: !2)
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!5 = !MDFile(filename: "a.cpp", directory: "/tmp/dbginfo")
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!6 = !MDSubroutineType(types: !7)
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!7 = !{!8, !8}
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!8 = !MDBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!9 = !{!10}
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!10 = !MDGlobalVariable(name: "x", line: 4, isLocal: false, isDefinition: true, scope: null, file: !5, type: !11, variable: i32 (i32)** @x)
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!11 = !MDDerivedType(tag: DW_TAG_pointer_type, size: 64, align: 64, baseType: !6)
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!12 = !MDCompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.5.0 ", isOptimized: false, emissionKind: 1, file: !13, enums: !2, retainedTypes: !2, subprograms: !14, globals: !17, imports: !2)
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!13 = !MDFile(filename: "b.cpp", directory: "/tmp/dbginfo")
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!14 = !{!15}
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!15 = !MDSubprogram(name: "func", linkageName: "_Z4funci", line: 1, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, scopeLine: 1, file: !13, scope: !16, type: !6, function: i32 (i32)* @_Z4funci, variables: !2)
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!16 = !MDFile(filename: "b.cpp", directory: "/tmp/dbginfo")
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!17 = !{!18}
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!18 = !MDGlobalVariable(name: "y", line: 4, isLocal: false, isDefinition: true, scope: null, file: !16, type: !11, variable: i32 (i32)** @y)
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!19 = !{i32 2, !"Dwarf Version", i32 4}
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!20 = !{i32 1, !"Debug Info Version", i32 3}
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!21 = !{!"clang version 3.5.0 "}
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!22 = !MDLocalVariable(tag: DW_TAG_arg_variable, name: "i", line: 1, arg: 1, scope: !4, file: !5, type: !8)
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!23 = !MDLocation(line: 1, scope: !4)
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!24 = !MDLocation(line: 2, scope: !4)
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