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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
183 lines
7.6 KiB
LLVM
183 lines
7.6 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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; The formal parameter 'b' for Function 'x' when inlined within 'a' is lost on
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; mips and powerpc64 (and on x86_64 at at least -O2). Presumably this is a
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; SelectionDAG issue (do mips/powerpc64 use FastISel?).
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; XFAIL: mips, powerpc64, s390x
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; Build from the following source with clang -O2.
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; The important details are that 'x's abstract definition is first built during
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; the definition of 'b', where the parameter to 'x' is constant and so 'x's 's'
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; variable is optimized away. No abstract definition DIE for 's' is constructed.
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; Then, during 'a' emission, the abstract DbgVariable for 's' is created, but
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; the abstract DIE isn't (since the abstract definition for 'b' is already
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; built). This results in 's' inlined in 'a' being emitted with its name, line,
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; file there, rather than referencing an abstract definition.
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; extern int t;
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;
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; void f(int);
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;
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; inline void x(bool b) {
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; if (b) {
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; int s = t;
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; f(s);
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; }
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; f(0);
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; }
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;
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; void b() {
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; x(false);
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; }
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;
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; void a(bool u) {
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; x(u);
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; }
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; CHECK: DW_TAG_subprogram
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; CHECK-NOT: DW_TAG
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; CHECK: DW_AT_name {{.*}} "x"
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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 {{.*}} "b"
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; CHECK-NOT: {{DW_TAG|NULL}}
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; CHECK: DW_TAG_lexical_block
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; CHECK-NOT: {{DW_TAG|NULL}}
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; CHECK: DW_TAG_variable
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; CHECK-NOT: DW_TAG
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; CHECK: DW_AT_name {{.*}} "s"
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; CHECK: DW_TAG_subprogram
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; CHECK-NOT: DW_TAG
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; CHECK: DW_AT_name {{.*}} "b"
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; CHECK-NOT: {{DW_TAG|NULL}}
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; CHECK: DW_TAG_inlined_subroutine
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; CHECK-NOT: DW_TAG
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; CHECK: DW_AT_abstract_origin {{.*}} "_Z1xb"
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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_abstract_origin {{.*}} "b"
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; Notice 'x's local variable 's' is missing. Not necessarily a bug here,
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; since it's been optimized entirely away and it should be described in
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; abstract subprogram.
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; CHECK-NOT: DW_TAG
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; CHECK: NULL
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; CHECK-NOT: DW_TAG
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; CHECK: NULL
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; CHECK: DW_TAG_subprogram
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; CHECK-NOT: DW_TAG
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; CHECK: DW_AT_name {{.*}} "a"
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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|NULL}}
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; CHECK: DW_TAG_inlined_subroutine
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; CHECK-NOT: DW_TAG
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; CHECK: DW_AT_abstract_origin {{.*}} "_Z1xb"
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; CHECK-NOT: {{DW_TAG|NULL}}
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; FIXME: This formal parameter goes missing at least at -O2 (& on
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; mips/powerpc), maybe before that. Perhaps SelectionDAG is to blame (and
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; fastisel succeeds).
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; CHECK: DW_TAG_formal_parameter
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; CHECK-NOT: DW_TAG
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; CHECK: DW_AT_abstract_origin {{.*}} "b"
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; CHECK-NOT: {{DW_TAG|NULL}}
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; CHECK: DW_TAG_lexical_block
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; CHECK-NOT: {{DW_TAG|NULL}}
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; CHECK: DW_TAG_variable
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; CHECK-NOT: DW_TAG
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; CHECK: DW_AT_abstract_origin {{.*}} "s"
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@t = external global i32
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; Function Attrs: uwtable
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define void @_Z1bv() #0 {
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entry:
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tail call void @llvm.dbg.value(metadata i1 false, i64 0, metadata !25, metadata !MDExpression()), !dbg !27
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tail call void @_Z1fi(i32 0), !dbg !28
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ret void, !dbg !29
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}
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; Function Attrs: uwtable
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define void @_Z1ab(i1 zeroext %u) #0 {
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entry:
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tail call void @llvm.dbg.value(metadata i1 %u, i64 0, metadata !13, metadata !MDExpression()), !dbg !30
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tail call void @llvm.dbg.value(metadata i1 %u, i64 0, metadata !31, metadata !MDExpression()), !dbg !33
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br i1 %u, label %if.then.i, label %_Z1xb.exit, !dbg !34
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if.then.i: ; preds = %entry
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%0 = load i32, i32* @t, align 4, !dbg !35, !tbaa !36
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tail call void @llvm.dbg.value(metadata i32 %0, i64 0, metadata !40, metadata !MDExpression()), !dbg !35
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tail call void @_Z1fi(i32 %0), !dbg !41
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br label %_Z1xb.exit, !dbg !42
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_Z1xb.exit: ; preds = %entry, %if.then.i
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tail call void @_Z1fi(i32 0), !dbg !43
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ret void, !dbg !44
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}
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declare void @_Z1fi(i32) #1
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; Function Attrs: nounwind readnone
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declare void @llvm.dbg.value(metadata, i64, metadata, metadata) #2
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attributes #0 = { 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 = { "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 #2 = { nounwind readnone }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!21, !22}
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!llvm.ident = !{!23}
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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: !2, subprograms: !3, globals: !2, imports: !2)
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!1 = !MDFile(filename: "missing-abstract-variables.cc", directory: "/tmp/dbginfo")
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!2 = !{}
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!3 = !{!4, !8, !14}
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!4 = !MDSubprogram(name: "b", linkageName: "_Z1bv", line: 13, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: true, scopeLine: 13, file: !1, scope: !5, type: !6, function: void ()* @_Z1bv, variables: !2)
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!5 = !MDFile(filename: "missing-abstract-variables.cc", directory: "/tmp/dbginfo")
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!6 = !MDSubroutineType(types: !7)
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!7 = !{null}
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!8 = !MDSubprogram(name: "a", linkageName: "_Z1ab", line: 17, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: true, scopeLine: 17, file: !1, scope: !5, type: !9, function: void (i1)* @_Z1ab, variables: !12)
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!9 = !MDSubroutineType(types: !10)
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!10 = !{null, !11}
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!11 = !MDBasicType(tag: DW_TAG_base_type, name: "bool", size: 8, align: 8, encoding: DW_ATE_boolean)
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!12 = !{!13}
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!13 = !MDLocalVariable(tag: DW_TAG_arg_variable, name: "u", line: 17, arg: 1, scope: !8, file: !5, type: !11)
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!14 = !MDSubprogram(name: "x", linkageName: "_Z1xb", line: 5, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: true, scopeLine: 5, file: !1, scope: !5, type: !9, variables: !15)
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!15 = !{!16, !17}
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!16 = !MDLocalVariable(tag: DW_TAG_arg_variable, name: "b", line: 5, arg: 1, scope: !14, file: !5, type: !11)
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!17 = !MDLocalVariable(tag: DW_TAG_auto_variable, name: "s", line: 7, scope: !18, file: !5, type: !20)
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!18 = distinct !MDLexicalBlock(line: 6, column: 0, file: !1, scope: !19)
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!19 = distinct !MDLexicalBlock(line: 6, column: 0, file: !1, scope: !14)
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!20 = !MDBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!21 = !{i32 2, !"Dwarf Version", i32 4}
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!22 = !{i32 2, !"Debug Info Version", i32 3}
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!23 = !{!"clang version 3.5.0 "}
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!24 = !{i1 false}
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!25 = !MDLocalVariable(tag: DW_TAG_arg_variable, name: "b", line: 5, arg: 1, scope: !14, file: !5, type: !11, inlinedAt: !26)
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!26 = !MDLocation(line: 14, scope: !4)
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!27 = !MDLocation(line: 5, scope: !14, inlinedAt: !26)
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!28 = !MDLocation(line: 10, scope: !14, inlinedAt: !26)
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!29 = !MDLocation(line: 15, scope: !4)
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!30 = !MDLocation(line: 17, scope: !8)
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!31 = !MDLocalVariable(tag: DW_TAG_arg_variable, name: "b", line: 5, arg: 1, scope: !14, file: !5, type: !11, inlinedAt: !32)
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!32 = !MDLocation(line: 18, scope: !8)
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!33 = !MDLocation(line: 5, scope: !14, inlinedAt: !32)
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!34 = !MDLocation(line: 6, scope: !19, inlinedAt: !32)
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!35 = !MDLocation(line: 7, scope: !18, inlinedAt: !32)
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!36 = !{!37, !37, i64 0}
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!37 = !{!"int", !38, i64 0}
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!38 = !{!"omnipotent char", !39, i64 0}
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!39 = !{!"Simple C/C++ TBAA"}
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!40 = !MDLocalVariable(tag: DW_TAG_auto_variable, name: "s", line: 7, scope: !18, file: !5, type: !20, inlinedAt: !32)
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!41 = !MDLocation(line: 8, scope: !18, inlinedAt: !32)
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!42 = !MDLocation(line: 9, scope: !18, inlinedAt: !32)
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!43 = !MDLocation(line: 10, scope: !14, inlinedAt: !32)
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!44 = !MDLocation(line: 19, scope: !8)
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