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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
109 lines
5.8 KiB
LLVM
109 lines
5.8 KiB
LLVM
; RUN: llc -O0 -mtriple=x86_64-apple-darwin < %s -filetype=obj \
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; RUN: | llvm-dwarfdump -debug-dump=info - \
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; RUN: | FileCheck %s -check-prefix=CHECK -check-prefix=DWARF4
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; RUN: llc -O0 -mtriple=x86_64-apple-darwin < %s -filetype=obj -dwarf-version=3 \
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; RUN: | llvm-dwarfdump -debug-dump=info - \
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; RUN: | FileCheck %s -check-prefix=CHECK -check-prefix=DWARF3
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; FIXME: The location here needs to be fixed, but llvm-dwarfdump doesn't handle
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; DW_AT_location lists yet.
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; DWARF4: DW_AT_location [DW_FORM_sec_offset] (0x00000000)
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; FIXME: The location here needs to be fixed, but llvm-dwarfdump doesn't handle
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; DW_AT_location lists yet.
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; DWARF3: DW_AT_location [DW_FORM_data4] (0x00000000)
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; CHECK-NOT: DW_TAG
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; CHECK: DW_AT_name [DW_FORM_strp] ( .debug_str[0x00000067] = "vla")
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; Unfortunately llvm-dwarfdump can't unparse a list of DW_AT_locations
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; right now, so we check the asm output:
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; RUN: llc -O0 -mtriple=x86_64-apple-darwin %s -o - -filetype=asm | FileCheck %s -check-prefix=ASM-CHECK
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; vla should have a register-indirect address at one point.
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; ASM-CHECK: DEBUG_VALUE: vla <- RCX
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; ASM-CHECK: DW_OP_breg2
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define void @testVLAwithSize(i32 %s) nounwind uwtable ssp {
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entry:
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%s.addr = alloca i32, align 4
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%saved_stack = alloca i8*
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%i = alloca i32, align 4
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store i32 %s, i32* %s.addr, align 4
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call void @llvm.dbg.declare(metadata !{i32* %s.addr}, metadata !10, metadata !{i32 786690}), !dbg !11
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%0 = load i32* %s.addr, align 4, !dbg !12
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%1 = zext i32 %0 to i64, !dbg !12
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%2 = call i8* @llvm.stacksave(), !dbg !12
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store i8* %2, i8** %saved_stack, !dbg !12
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%vla = alloca i32, i64 %1, align 16, !dbg !12
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call void @llvm.dbg.declare(metadata !{i32* %vla}, metadata !14, metadata !30), !dbg !18
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call void @llvm.dbg.declare(metadata !{i32* %i}, metadata !19, metadata !{i32 786690}), !dbg !20
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store i32 0, i32* %i, align 4, !dbg !21
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br label %for.cond, !dbg !21
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for.cond: ; preds = %for.inc, %entry
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%3 = load i32* %i, align 4, !dbg !21
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%4 = load i32* %s.addr, align 4, !dbg !21
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%cmp = icmp slt i32 %3, %4, !dbg !21
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br i1 %cmp, label %for.body, label %for.end, !dbg !21
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for.body: ; preds = %for.cond
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%5 = load i32* %i, align 4, !dbg !23
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%6 = load i32* %i, align 4, !dbg !23
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%mul = mul nsw i32 %5, %6, !dbg !23
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%7 = load i32* %i, align 4, !dbg !23
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%idxprom = sext i32 %7 to i64, !dbg !23
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%arrayidx = getelementptr inbounds i32* %vla, i64 %idxprom, !dbg !23
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store i32 %mul, i32* %arrayidx, align 4, !dbg !23
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br label %for.inc, !dbg !25
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for.inc: ; preds = %for.body
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%8 = load i32* %i, align 4, !dbg !26
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%inc = add nsw i32 %8, 1, !dbg !26
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store i32 %inc, i32* %i, align 4, !dbg !26
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br label %for.cond, !dbg !26
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for.end: ; preds = %for.cond
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%9 = load i8** %saved_stack, !dbg !27
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call void @llvm.stackrestore(i8* %9), !dbg !27
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ret void, !dbg !27
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}
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declare void @llvm.dbg.declare(metadata, metadata, metadata) nounwind readnone
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declare i8* @llvm.stacksave() nounwind
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declare void @llvm.stackrestore(i8*) nounwind
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!29}
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!0 = metadata !{i32 786449, metadata !28, i32 12, metadata !"clang version 3.2 (trunk 156005) (llvm/trunk 156000)", i1 false, metadata !"", i32 0, metadata !1, metadata !1, metadata !3, metadata !1, metadata !1, metadata !"", i32 1} ; [ DW_TAG_compile_unit ]
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!1 = metadata !{}
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!3 = metadata !{metadata !5}
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!5 = metadata !{i32 786478, metadata !28, metadata !6, metadata !"testVLAwithSize", metadata !"testVLAwithSize", metadata !"", i32 1, metadata !7, i1 false, i1 true, i32 0, i32 0, null, i32 256, i1 false, void (i32)* @testVLAwithSize, null, null, metadata !1, i32 2} ; [ DW_TAG_subprogram ]
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!6 = metadata !{i32 786473, metadata !28} ; [ DW_TAG_file_type ]
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!7 = metadata !{i32 786453, i32 0, null, i32 0, i32 0, i64 0, i64 0, i64 0, i32 0, null, metadata !8, i32 0, null, null, null} ; [ DW_TAG_subroutine_type ] [line 0, size 0, align 0, offset 0] [from ]
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!8 = metadata !{null, metadata !9}
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!9 = metadata !{i32 786468, null, null, metadata !"int", i32 0, i64 32, i64 32, i64 0, i32 0, i32 5} ; [ DW_TAG_base_type ]
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!10 = metadata !{i32 786689, metadata !5, metadata !"s", metadata !6, i32 16777217, metadata !9, i32 0, i32 0} ; [ DW_TAG_arg_variable ]
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!11 = metadata !{i32 1, i32 26, metadata !5, null}
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!12 = metadata !{i32 3, i32 13, metadata !13, null}
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!13 = metadata !{i32 786443, metadata !28, metadata !5, i32 2, i32 1, i32 0} ; [ DW_TAG_lexical_block ]
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!14 = metadata !{i32 786688, metadata !13, metadata !"vla", metadata !6, i32 3, metadata !15, i32 8192, i32 0} ;; [ DW_TAG_auto_variable ]
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!15 = metadata !{i32 786433, null, null, metadata !"", i32 0, i64 0, i64 32, i32 0, i32 0, metadata !9, metadata !16, i32 0, null, null, null} ; [ DW_TAG_array_type ] [line 0, size 0, align 32, offset 0] [from int]
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!16 = metadata !{metadata !17}
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!17 = metadata !{i32 786465, i64 0, i64 -1} ; [ DW_TAG_subrange_type ]
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!18 = metadata !{i32 3, i32 7, metadata !13, null}
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!19 = metadata !{i32 786688, metadata !13, metadata !"i", metadata !6, i32 4, metadata !9, i32 0, i32 0} ; [ DW_TAG_auto_variable ]
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!20 = metadata !{i32 4, i32 7, metadata !13, null}
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!21 = metadata !{i32 5, i32 8, metadata !22, null}
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!22 = metadata !{i32 786443, metadata !28, metadata !13, i32 5, i32 3, i32 1} ; [ DW_TAG_lexical_block ]
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!23 = metadata !{i32 6, i32 5, metadata !24, null}
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!24 = metadata !{i32 786443, metadata !28, metadata !22, i32 5, i32 27, i32 2} ; [ DW_TAG_lexical_block ]
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!25 = metadata !{i32 7, i32 3, metadata !24, null}
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!26 = metadata !{i32 5, i32 22, metadata !22, null}
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!27 = metadata !{i32 8, i32 1, metadata !13, null}
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!28 = metadata !{metadata !"bar.c", metadata !"/Users/echristo/tmp"}
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!29 = metadata !{i32 1, metadata !"Debug Info Version", i32 1}
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!30 = metadata !{i32 786690, i64 6} ; [DW_OP_deref]
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