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02474a32eb
argument of the llvm.dbg.declare/llvm.dbg.value intrinsics. Previously, DIVariable was a variable-length field that has an optional reference to a Metadata array consisting of a variable number of complex address expressions. In the case of OpPiece expressions this is wasting a lot of storage in IR, because when an aggregate type is, e.g., SROA'd into all of its n individual members, the IR will contain n copies of the DIVariable, all alike, only differing in the complex address reference at the end. By making the complex address into an extra argument of the dbg.value/dbg.declare intrinsics, all of the pieces can reference the same variable and the complex address expressions can be uniqued across the CU, too. Down the road, this will allow us to move other flags, such as "indirection" out of the DIVariable, too. The new intrinsics look like this: declare void @llvm.dbg.declare(metadata %storage, metadata %var, metadata %expr) declare void @llvm.dbg.value(metadata %storage, i64 %offset, metadata %var, metadata %expr) This patch adds a new LLVM-local tag to DIExpressions, so we can detect and pretty-print DIExpression metadata nodes. What this patch doesn't do: This patch does not touch the "Indirect" field in DIVariable; but moving that into the expression would be a natural next step. http://reviews.llvm.org/D4919 rdar://problem/17994491 Thanks to dblaikie and dexonsmith for reviewing this patch! Note: I accidentally committed a bogus older version of this patch previously. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@218787 91177308-0d34-0410-b5e6-96231b3b80d8
32 lines
2.6 KiB
LLVM
32 lines
2.6 KiB
LLVM
; RUN: llc -O0 -relocation-model pic < %s -o /dev/null
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; PR7545
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@.str = private constant [4 x i8] c"one\00", align 1 ; <[4 x i8]*> [#uses=1]
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@.str1 = private constant [4 x i8] c"two\00", align 1 ; <[5 x i8]*> [#uses=1]
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@C.9.2167 = internal constant [2 x i8*] [i8* getelementptr inbounds ([4 x i8]* @.str, i64 0, i64 0), i8* getelementptr inbounds ([4 x i8]* @.str1, i64 0, i64 0)]
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!38 = metadata !{i32 524329, metadata !109} ; [ DW_TAG_file_type ]
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!39 = metadata !{i32 524305, metadata !109, i32 1, metadata !"4.2.1 (Based on Apple Inc. build 5658) (LLVM build 9999)", i1 true, metadata !"", i32 0, metadata !108, metadata !108, null, null, null, metadata !""} ; [ DW_TAG_compile_unit ]
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!46 = metadata !{i32 524303, metadata !109, null, metadata !"", i32 0, i64 64, i64 64, i64 0, i32 0, metadata !47} ; [ DW_TAG_pointer_type ]
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!47 = metadata !{i32 524324, metadata !109, null, metadata !"char", i32 0, i64 8, i64 8, i64 0, i32 0, i32 6} ; [ DW_TAG_base_type ]
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!97 = metadata !{i32 524334, i32 0, metadata !39, metadata !"main", metadata !"main", metadata !"main", i32 73, metadata !98, i1 false, i1 true, i32 0, i32 0, null, i32 0, i32 0, null, null, null, null, i32 0} ; [ DW_TAG_subprogram ]
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!98 = metadata !{i32 524309, metadata !109, null, metadata !"", i32 0, i64 0, i64 0, i64 0, i32 0, null, metadata !99, i32 0, null, null, null} ; [ DW_TAG_subroutine_type ] [line 0, size 0, align 0, offset 0] [from ]
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!99 = metadata !{metadata !100}
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!100 = metadata !{i32 524324, metadata !109, null, metadata !"int", i32 0, i64 32, i64 32, i64 0, i32 0, i32 5} ; [ DW_TAG_base_type ]
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!101 = metadata !{[2 x i8*]* @C.9.2167}
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!102 = metadata !{i32 524544, metadata !103, metadata !"find_strings", metadata !38, i32 75, metadata !104, i32 0, i32 0} ; [ DW_TAG_auto_variable ]
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!103 = metadata !{i32 524299, null, metadata !97, i32 73, i32 0, i32 0} ; [ DW_TAG_lexical_block ]
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!104 = metadata !{i32 524289, metadata !109, null, metadata !"", i32 0, i64 85312, i64 64, i64 0, i32 0, metadata !46, metadata !105, i32 0, null, null, null} ; [ DW_TAG_array_type ] [line 0, size 85312, align 64, offset 0] [from ]
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!105 = metadata !{metadata !106}
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!106 = metadata !{i32 524321, i64 0, i64 1333} ; [ DW_TAG_subrange_type ]
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!107 = metadata !{i32 73, i32 0, metadata !103, null}
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!108 = metadata !{i32 0}
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!109 = metadata !{metadata !"pbmsrch.c", metadata !"/Users/grawp/LLVM/test-suite/MultiSource/Benchmarks/MiBench/office-stringsearch"}
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define i32 @main() nounwind ssp {
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bb.nph:
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tail call void @llvm.dbg.declare(metadata !101, metadata !102, metadata !{i32 786690}), !dbg !107
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ret i32 0, !dbg !107
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}
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declare void @llvm.dbg.declare(metadata, metadata, metadata) nounwind readnone
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