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9c4b79c3d5
`WebAssemblyDebugValueManager` does not currently handle `DBG_VALUE_LIST`, which is a recent addition to LLVM. We tried to nullify them within the constructor of `WebAssemblyDebugValueManager` in D102589, but it made the class error-prone to use because it deletes instructions within the constructor and thus invalidates existing iterators within the BB, so the user of the class should take special care not to use invalidated iterators. This actually caused a bug in ExplicitLocals pass. Instead of trying to fix ExplicitLocals pass to make the iterator usage correct, which is possible but error-prone, this adds NullifyDebugValueLists pass that nullifies all `DBG_VALUE_LIST` instructions before we run WebAssembly specific passes in the backend. We can remove this pass after we implement handlers for `DBG_VALUE_LIST`s in `WebAssemblyDebugValueManager` and elsewhere. Fixes https://github.com/emscripten-core/emscripten/issues/14255. Reviewed By: dschuff Differential Revision: https://reviews.llvm.org/D102999
43 lines
2.0 KiB
LLVM
43 lines
2.0 KiB
LLVM
; RUN: llc %s -stop-before wasm-nullify-dbg-value-lists -o - | FileCheck %s --check-prefix=BEFORE
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; RUN: llc %s -stop-after wasm-nullify-dbg-value-lists -o - | FileCheck %s --check-prefix=AFTER
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target datalayout = "e-m:e-p:32:32-i64:64-n32:64-S128"
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target triple = "wasm32-unknown-unknown"
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; WebAssembly backend does not currently handle DBG_VALUE_LIST instructions
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; correctly. In the meantime, they are converted to 'DBG_VALUE $noreg's in
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; WebAssemblyNullifyDebugValueLists pass.
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; BEFORE: DBG_VALUE_LIST
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; AFTER-NOT: DBG_VALUE_LIST
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; AFTER: DBG_VALUE $noreg, $noreg
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define i32 @dbg_value_list_test() !dbg !6 {
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entry:
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%0 = call i32 @foo(), !dbg !9
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%1 = call i32 @foo(), !dbg !10
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%2 = add i32 %0, %1, !dbg !11
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; This DIArgList operand generates a DBG_VALUE_LIST instruction
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call void @llvm.dbg.value(metadata !DIArgList(i32 %0, i32 %1), metadata !8, metadata !DIExpression()), !dbg !11
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ret i32 %2, !dbg !12
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}
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declare i32 @foo()
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declare void @llvm.dbg.value(metadata, metadata, metadata)
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!3, !4, !5}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 11.0.0 (https://github.com/llvm/llvm-project.git ed7aaf832444411ce93aa0443425ce401f5c7a8e)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug)
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!1 = !DIFile(filename: "test.c", directory: "/home/llvm-project")
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!2 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
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!3 = !{i32 7, !"Dwarf Version", i32 4}
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!4 = !{i32 2, !"Debug Info Version", i32 3}
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!5 = !{i32 1, !"wchar_size", i32 4}
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!6 = distinct !DISubprogram(name: "", scope: !1, file: !1, line: 3, type: !7, scopeLine: 3, flags: DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0)
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!7 = !DISubroutineType(types: !{null})
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!8 = !DILocalVariable(name: "i", scope: !6, file: !1, line: 4, type: !2)
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!9 = !DILocation(line: 4, column: 11, scope: !6)
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!10 = !DILocation(line: 5, column: 11, scope: !6)
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!11 = !DILocation(line: 6, column: 3, scope: !6)
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!12 = !DILocation(line: 7, column: 1, scope: !6)
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