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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
106 lines
5.4 KiB
LLVM
106 lines
5.4 KiB
LLVM
; REQUIRES: object-emission
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; RUN: llc -mtriple=x86_64-apple-macosx10.10.0 -o %t %s
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; Testcase generated from:
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; #include <stdint.h>
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; int foo(int a) {
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; int b = (int16_t)a + 8;
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; int c = (int16_t)b + 8;
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; int d = (int16_t)c + 8;
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; int e = (int16_t)d + 8;
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; int f = (int16_t)e + 8;
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; return f;
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; }
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; by emitting the IR and then manually applying mem2reg to it.
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; This testcase would trigger the assert commited along with it if the
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; fix of r221709 isn't applied. There is no other check except the successful
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; run of llc.
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; What happened before r221709, is that SDDbgInfo (the data structure helping
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; SelectionDAG to keep track of dbg.values) kept a map keyed by SDNode pointers.
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; This map was never purged when the SDNodes were deallocated and thus if a new
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; SDNode was allocated in the same memory, it would have an entry in the SDDbgInfo
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; map upon creation (Reallocation in the same memory can happen easily as
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; SelectionDAG uses a Recycling allocator). This behavior could turn into a
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; pathological memory consumption explosion if the DAG combiner hit the 'right'
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; allocation patterns as could be seen in PR20893.
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; By nature, this test could bitrot quite easily. If it doesn't trigger an assert
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; when run with r221709 reverted, then it really doesn't test anything anymore.
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; Function Attrs: nounwind ssp uwtable
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define i32 @foo(i32 %a) #0 {
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entry:
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call void @llvm.dbg.value(metadata i32 %a, i64 0, metadata !16, metadata !17), !dbg !18
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%conv = trunc i32 %a to i16, !dbg !19
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%conv1 = sext i16 %conv to i32, !dbg !19
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%add = add nsw i32 %conv1, 8, !dbg !19
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call void @llvm.dbg.value(metadata i32 %add, i64 0, metadata !20, metadata !17), !dbg !21
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%conv2 = trunc i32 %add to i16, !dbg !22
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%conv3 = sext i16 %conv2 to i32, !dbg !22
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%add4 = add nsw i32 %conv3, 8, !dbg !22
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call void @llvm.dbg.value(metadata i32 %add4, i64 0, metadata !23, metadata !17), !dbg !24
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%conv5 = trunc i32 %add4 to i16, !dbg !25
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%conv6 = sext i16 %conv5 to i32, !dbg !25
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%add7 = add nsw i32 %conv6, 8, !dbg !25
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call void @llvm.dbg.value(metadata i32 %add7, i64 0, metadata !26, metadata !17), !dbg !27
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%conv8 = trunc i32 %add7 to i16, !dbg !28
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%conv9 = sext i16 %conv8 to i32, !dbg !28
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%add10 = add nsw i32 %conv9, 8, !dbg !28
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call void @llvm.dbg.value(metadata i32 %add10, i64 0, metadata !29, metadata !17), !dbg !30
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%conv11 = trunc i32 %add10 to i16, !dbg !31
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%conv12 = sext i16 %conv11 to i32, !dbg !31
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%add13 = add nsw i32 %conv12, 8, !dbg !31
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call void @llvm.dbg.value(metadata i32 %add13, i64 0, metadata !32, metadata !17), !dbg !33
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ret i32 %add13, !dbg !34
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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 ssp 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 = !{!0}
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!llvm.module.flags = !{!13, !14}
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!llvm.ident = !{!15}
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!0 = !MDCompileUnit(language: DW_LANG_C99, producer: "clang version 3.6.0 ", isOptimized: false, emissionKind: 1, file: !1, enums: !2, retainedTypes: !3, subprograms: !7, globals: !2, imports: !2)
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!1 = !MDFile(filename: "ghost-sdnode-dbgvalues.c", directory: "/tmp")
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!2 = !{}
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!3 = !{!4}
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!4 = !MDDerivedType(tag: DW_TAG_typedef, name: "int16_t", line: 30, file: !5, baseType: !6)
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!5 = !MDFile(filename: "/usr/include/sys/_types/_int16_t.h", directory: "/tmp")
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!6 = !MDBasicType(tag: DW_TAG_base_type, name: "short", size: 16, align: 16, encoding: DW_ATE_signed)
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!7 = !{!8}
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!8 = !MDSubprogram(name: "foo", line: 3, isLocal: false, isDefinition: true, flags: DIFlagPrototyped, isOptimized: false, scopeLine: 3, file: !1, scope: !9, type: !10, function: i32 (i32)* @foo, variables: !2)
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!9 = !MDFile(filename: "ghost-sdnode-dbgvalues.c", directory: "/tmp")
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!10 = !MDSubroutineType(types: !11)
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!11 = !{!12, !12}
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!12 = !MDBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!13 = !{i32 2, !"Dwarf Version", i32 2}
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!14 = !{i32 2, !"Debug Info Version", i32 3}
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!15 = !{!"clang version 3.6.0 "}
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!16 = !MDLocalVariable(tag: DW_TAG_arg_variable, name: "a", line: 3, arg: 1, scope: !8, file: !9, type: !12)
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!17 = !MDExpression()
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!18 = !MDLocation(line: 3, column: 13, scope: !8)
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!19 = !MDLocation(line: 4, column: 5, scope: !8)
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!20 = !MDLocalVariable(tag: DW_TAG_auto_variable, name: "b", line: 4, scope: !8, file: !9, type: !12)
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!21 = !MDLocation(line: 4, column: 9, scope: !8)
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!22 = !MDLocation(line: 5, column: 5, scope: !8)
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!23 = !MDLocalVariable(tag: DW_TAG_auto_variable, name: "c", line: 5, scope: !8, file: !9, type: !12)
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!24 = !MDLocation(line: 5, column: 9, scope: !8)
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!25 = !MDLocation(line: 6, column: 5, scope: !8)
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!26 = !MDLocalVariable(tag: DW_TAG_auto_variable, name: "d", line: 6, scope: !8, file: !9, type: !12)
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!27 = !MDLocation(line: 6, column: 9, scope: !8)
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!28 = !MDLocation(line: 7, column: 5, scope: !8)
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!29 = !MDLocalVariable(tag: DW_TAG_auto_variable, name: "e", line: 7, scope: !8, file: !9, type: !12)
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!30 = !MDLocation(line: 7, column: 9, scope: !8)
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!31 = !MDLocation(line: 8, column: 5, scope: !8)
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!32 = !MDLocalVariable(tag: DW_TAG_auto_variable, name: "f", line: 8, scope: !8, file: !9, type: !12)
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!33 = !MDLocation(line: 8, column: 9, scope: !8)
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!34 = !MDLocation(line: 9, column: 5, scope: !8)
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