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380b5bd2b0
Remove 'inlinedAt:' from MDLocalVariable. Besides saving some memory (variables with it seem to be single largest `Metadata` contributer to memory usage right now in -g -flto builds), this stops optimization and backend passes from having to change local variables. The 'inlinedAt:' field was used by the backend in two ways: 1. To tell the backend whether and into what a variable was inlined. 2. To create a unique id for each inlined variable. Instead, rely on the 'inlinedAt:' field of the intrinsic's `!dbg` attachment, and change the DWARF backend to use a typedef called `InlinedVariable` which is `std::pair<MDLocalVariable*, MDLocation*>`. This `DebugLoc` is already passed reliably through the backend (as verified by r234021). This commit removes the check from r234021, but I added a new check (that will survive) in r235048, and changed the `DIBuilder` API in r235041 to require a `!dbg` attachment whose 'scope:` is in the same `MDSubprogram` as the variable's. If this breaks your out-of-tree testcases, perhaps the script I used (mdlocalvariable-drop-inlinedat.sh) will help; I'll attach it to PR22778 in a moment. llvm-svn: 235050
58 lines
3.4 KiB
LLVM
58 lines
3.4 KiB
LLVM
; RUN: opt -mem2reg < %s | llvm-dis | grep ".dbg " | count 7
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declare void @llvm.dbg.declare(metadata, metadata, metadata) nounwind readnone
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declare void @foo(i32, i64, i8*)
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define void @baz(i32 %a) nounwind ssp {
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entry:
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%x_addr.i = alloca i32 ; <i32*> [#uses=2]
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%y_addr.i = alloca i64 ; <i64*> [#uses=2]
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%z_addr.i = alloca i8* ; <i8**> [#uses=2]
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%a_addr = alloca i32 ; <i32*> [#uses=2]
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%"alloca point" = bitcast i32 0 to i32 ; <i32> [#uses=0]
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call void @llvm.dbg.declare(metadata i32* %a_addr, metadata !0, metadata !MDExpression()), !dbg !7
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store i32 %a, i32* %a_addr
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%0 = load i32, i32* %a_addr, align 4, !dbg !8 ; <i32> [#uses=1]
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call void @llvm.dbg.declare(metadata i32* %x_addr.i, metadata !9, metadata !MDExpression()) nounwind, !dbg !15
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store i32 %0, i32* %x_addr.i
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call void @llvm.dbg.declare(metadata i64* %y_addr.i, metadata !16, metadata !MDExpression()) nounwind, !dbg !15
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store i64 55, i64* %y_addr.i
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call void @llvm.dbg.declare(metadata i8** %z_addr.i, metadata !17, metadata !MDExpression()) nounwind, !dbg !15
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store i8* bitcast (void (i32)* @baz to i8*), i8** %z_addr.i
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%1 = load i32, i32* %x_addr.i, align 4, !dbg !18 ; <i32> [#uses=1]
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%2 = load i64, i64* %y_addr.i, align 8, !dbg !18 ; <i64> [#uses=1]
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%3 = load i8*, i8** %z_addr.i, align 8, !dbg !18 ; <i8*> [#uses=1]
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call void @foo(i32 %1, i64 %2, i8* %3) nounwind, !dbg !18
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br label %return, !dbg !19
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return: ; preds = %entry
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ret void, !dbg !19
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}
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!llvm.dbg.cu = !{!3}
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!llvm.module.flags = !{!22}
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!0 = !MDLocalVariable(tag: DW_TAG_arg_variable, name: "a", line: 8, arg: 0, scope: !1, file: !2, type: !6)
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!1 = !MDSubprogram(name: "baz", linkageName: "baz", line: 8, isLocal: false, isDefinition: true, virtualIndex: 6, isOptimized: false, scopeLine: 8, file: !20, scope: !2, type: !4, function: void (i32)* @baz)
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!2 = !MDFile(filename: "bar.c", directory: "/tmp/")
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!3 = !MDCompileUnit(language: DW_LANG_C89, producer: "4.2.1 (Based on Apple Inc. build 5658) (LLVM build)", isOptimized: true, emissionKind: 0, file: !20, enums: !21, retainedTypes: !21)
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!4 = !MDSubroutineType(types: !5)
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!5 = !{null, !6}
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!6 = !MDBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!7 = !MDLocation(line: 8, scope: !1)
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!8 = !MDLocation(line: 9, scope: !1)
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!9 = !MDLocalVariable(tag: DW_TAG_arg_variable, name: "x", line: 4, arg: 0, scope: !10, file: !2, type: !6)
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!10 = !MDSubprogram(name: "bar", linkageName: "bar", line: 4, isLocal: true, isDefinition: true, virtualIndex: 6, isOptimized: false, scopeLine: 4, file: !20, scope: !2, type: !11)
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!11 = !MDSubroutineType(types: !12)
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!12 = !{null, !6, !13, !14}
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!13 = !MDBasicType(tag: DW_TAG_base_type, name: "long int", size: 64, align: 64, encoding: DW_ATE_signed)
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!14 = !MDDerivedType(tag: DW_TAG_pointer_type, size: 64, align: 64, file: !20, scope: !2, baseType: null)
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!15 = !MDLocation(line: 4, scope: !10, inlinedAt: !8)
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!16 = !MDLocalVariable(tag: DW_TAG_arg_variable, name: "y", line: 4, arg: 0, scope: !10, file: !2, type: !13)
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!17 = !MDLocalVariable(tag: DW_TAG_arg_variable, name: "z", line: 4, arg: 0, scope: !10, file: !2, type: !14)
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!18 = !MDLocation(line: 5, scope: !10, inlinedAt: !8)
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!19 = !MDLocation(line: 10, scope: !1)
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!20 = !MDFile(filename: "bar.c", directory: "/tmp/")
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!21 = !{}
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!22 = !{i32 1, !"Debug Info Version", i32 3}
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