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https://github.com/c64scene-ar/llvm-6502.git
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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
58 lines
4.2 KiB
LLVM
58 lines
4.2 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 !{}), !dbg !7
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store i32 %a, i32* %a_addr
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%0 = load 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 !{}) 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 !{}) 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 !{}) 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* %x_addr.i, align 4, !dbg !18 ; <i32> [#uses=1]
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%2 = load i64* %y_addr.i, align 8, !dbg !18 ; <i64> [#uses=1]
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%3 = load 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 = metadata !{i32 786689, metadata !1, metadata !"a", metadata !2, i32 8, metadata !6, i32 0, null} ; [ DW_TAG_arg_variable ]
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!1 = metadata !{i32 786478, metadata !20, metadata !2, metadata !"baz", metadata !"baz", metadata !"baz", i32 8, metadata !4, i1 false, i1 true, i32 0, i32 0, null, i32 0, i1 false, void (i32)* @baz, null, null, null, i32 8} ; [ DW_TAG_subprogram ]
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!2 = metadata !{i32 786473, metadata !20} ; [ DW_TAG_file_type ]
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!3 = metadata !{i32 786449, metadata !20, i32 1, metadata !"4.2.1 (Based on Apple Inc. build 5658) (LLVM build)", i1 true, metadata !"", i32 0, metadata !21, metadata !21, null, null, null, metadata !""} ; [ DW_TAG_compile_unit ]
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!4 = metadata !{i32 786453, metadata !20, metadata !2, metadata !"", i32 0, i64 0, i64 0, i64 0, i32 0, null, metadata !5, i32 0, null, null, null} ; [ DW_TAG_subroutine_type ] [line 0, size 0, align 0, offset 0] [from ]
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!5 = metadata !{null, metadata !6}
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!6 = metadata !{i32 786468, metadata !20, metadata !2, metadata !"int", i32 0, i64 32, i64 32, i64 0, i32 0, i32 5} ; [ DW_TAG_base_type ]
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!7 = metadata !{i32 8, i32 0, metadata !1, null}
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!8 = metadata !{i32 9, i32 0, metadata !1, null}
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!9 = metadata !{i32 786689, metadata !10, metadata !"x", metadata !2, i32 4, metadata !6, i32 0, null} ; [ DW_TAG_arg_variable ]
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!10 = metadata !{i32 786478, metadata !20, metadata !2, metadata !"bar", metadata !"bar", metadata !"bar", i32 4, metadata !11, i1 true, i1 true, i32 0, i32 0, null, i1 false, i1 false, null, null, null, null, i32 4} ; [ DW_TAG_subprogram ]
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!11 = metadata !{i32 786453, metadata !20, metadata !2, metadata !"", i32 0, i64 0, i64 0, i64 0, i32 0, null, metadata !12, i32 0, null, null, null} ; [ DW_TAG_subroutine_type ] [line 0, size 0, align 0, offset 0] [from ]
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!12 = metadata !{null, metadata !6, metadata !13, metadata !14}
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!13 = metadata !{i32 786468, metadata !20, metadata !2, metadata !"long int", i32 0, i64 64, i64 64, i64 0, i32 0, i32 5} ; [ DW_TAG_base_type ]
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!14 = metadata !{i32 786447, metadata !20, metadata !2, metadata !"", i32 0, i64 64, i64 64, i64 0, i32 0, null} ; [ DW_TAG_pointer_type ]
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!15 = metadata !{i32 4, i32 0, metadata !10, metadata !8}
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!16 = metadata !{i32 786689, metadata !10, metadata !"y", metadata !2, i32 4, metadata !13, i32 0, null} ; [ DW_TAG_arg_variable ]
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!17 = metadata !{i32 786689, metadata !10, metadata !"z", metadata !2, i32 4, metadata !14, i32 0, null} ; [ DW_TAG_arg_variable ]
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!18 = metadata !{i32 5, i32 0, metadata !10, metadata !8}
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!19 = metadata !{i32 10, i32 0, metadata !1, null}
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!20 = metadata !{metadata !"bar.c", metadata !"/tmp/"}
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!21 = metadata !{i32 0}
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!22 = metadata !{i32 1, metadata !"Debug Info Version", i32 1}
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