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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
49 lines
2.7 KiB
LLVM
49 lines
2.7 KiB
LLVM
; RUN: llc < %s -mtriple=x86_64-apple-macosx -enable-misched \
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; RUN: -verify-machineinstrs | FileCheck %s
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;
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; Test RegisterPressure handling of DBG_VALUE.
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;
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; CHECK: %entry
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; CHECK: DEBUG_VALUE: callback
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; CHECK: ret
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%struct.btCompoundLeafCallback = type { i32, i32 }
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declare void @llvm.dbg.declare(metadata, metadata, metadata) nounwind readnone
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define void @test() unnamed_addr uwtable ssp align 2 {
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entry:
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%callback = alloca %struct.btCompoundLeafCallback, align 8
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br i1 undef, label %if.end, label %if.then
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if.then: ; preds = %entry
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unreachable
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if.end: ; preds = %entry
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call void @llvm.dbg.declare(metadata !{%struct.btCompoundLeafCallback* %callback}, metadata !3, metadata !{i32 786690})
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%m = getelementptr inbounds %struct.btCompoundLeafCallback* %callback, i64 0, i32 1
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store i32 0, i32* undef, align 8
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%cmp12447 = icmp sgt i32 undef, 0
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br i1 %cmp12447, label %for.body.lr.ph, label %invoke.cont44
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for.body.lr.ph: ; preds = %if.end
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unreachable
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invoke.cont44: ; preds = %if.end
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ret void
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}
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!8}
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!0 = metadata !{i32 786449, metadata !6, i32 4, metadata !"clang version 3.3 (trunk 168984) (llvm/trunk 168983)", i1 true, metadata !"", i32 0, null, null, metadata !1, null, null, metadata !""} ; [ DW_TAG_compile_unit ] [MultiSource/Benchmarks/Bullet/MultiSource/Benchmarks/Bullet/btCompoundCollisionAlgorithm.cpp] [DW_LANG_C_plus_plus]
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!1 = metadata !{metadata !2}
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!2 = metadata !{i32 786478, metadata !6, metadata !5, metadata !"test", metadata !"test", null, i32 0, metadata !7, i1 false, i1 true, i32 0, i32 0, null, i32 256, i1 true, void ()* @test, null, null, null, i32 1} ; [ DW_TAG_subprogram ] [def] [test]
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!3 = metadata !{i32 786688, null, metadata !"callback", null, i32 214, metadata !4, i32 0, i32 0} ; [ DW_TAG_auto_variable ] [callback] [line 214]
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!4 = metadata !{i32 786451, metadata !6, null, metadata !"btCompoundLeafCallback", i32 90, i64 512, i64 64, i32 0, i32 0, null, null, i32 0, null, null, null} ; [ DW_TAG_structure_type ] [btCompoundLeafCallback] [line 90, size 512, align 64, offset 0] [def] [from ]
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!5 = metadata !{i32 786473, metadata !6} ; [ DW_TAG_file_type ]
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!6 = metadata !{metadata !"MultiSource/Benchmarks/Bullet/btCompoundCollisionAlgorithm.cpp", metadata !"MultiSource/Benchmarks/Bullet"}
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!7 = metadata !{i32 786453, i32 0, null, metadata !"", i32 0, i64 0, i64 0, i64 0, i32 0, null, metadata !9, i32 0, null, null, null} ; [ DW_TAG_subroutine_type ] [line 0, size 0, align 0, offset 0] [from ]
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!8 = metadata !{i32 1, metadata !"Debug Info Version", i32 1}
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!9 = metadata !{null}
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