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229943585f
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! llvm-svn: 218778
201 lines
11 KiB
LLVM
201 lines
11 KiB
LLVM
; RUN: llc -split-dwarf=Enable -O0 %s -mtriple=x86_64-unknown-linux-gnu -filetype=obj -o %t
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; RUN: llvm-dwarfdump %t | FileCheck %s
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; RUN: llvm-objdump -h %t | FileCheck --check-prefix=HDR %s
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; CHECK: .debug_info contents:
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; CHECK: DW_TAG_compile_unit
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; CHECK-NEXT: DW_AT_stmt_list
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; CHECK-NEXT: DW_AT_GNU_dwo_name
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; CHECK-NEXT: DW_AT_comp_dir
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; CHECK-NEXT: DW_AT_GNU_dwo_id
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; CHECK-NEXT: DW_AT_GNU_addr_base [DW_FORM_sec_offset] (0x00000000)
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; CHECK: .debug_info.dwo contents:
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; CHECK: DW_AT_location [DW_FORM_sec_offset] ([[A:0x[0-9a-z]*]])
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; CHECK: DW_AT_location [DW_FORM_sec_offset] ([[E:0x[0-9a-z]*]])
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; CHECK: DW_AT_location [DW_FORM_sec_offset] ([[B:0x[0-9a-z]*]])
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; CHECK: DW_AT_location [DW_FORM_sec_offset] ([[D:0x[0-9a-z]*]])
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; CHECK: DW_AT_ranges [DW_FORM_sec_offset] (0x00000000)
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; CHECK: .debug_loc contents:
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; CHECK-NOT: Beginning address offset
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; CHECK: .debug_loc.dwo contents:
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; Don't assume these locations are entirely correct - feel free to update them
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; if they've changed due to a bugfix, change in register allocation, etc.
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; CHECK: [[A]]: Beginning address index: 2
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; CHECK-NEXT: Length: 190
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; CHECK-NEXT: Location description: 11 00
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; CHECK-NEXT: {{^$}}
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; CHECK-NEXT: Beginning address index: 3
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; CHECK-NEXT: Length: 23
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; CHECK-NEXT: Location description: 50 93 04
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; CHECK: [[E]]: Beginning address index: 4
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; CHECK-NEXT: Length: 21
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; CHECK-NEXT: Location description: 50 93 04
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; CHECK: [[B]]: Beginning address index: 5
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; CHECK-NEXT: Length: 19
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; CHECK-NEXT: Location description: 50 93 04
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; CHECK: [[D]]: Beginning address index: 6
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; CHECK-NEXT: Length: 23
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; CHECK-NEXT: Location description: 50 93 04
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; Make sure we don't produce any relocations in any .dwo section (though in particular, debug_info.dwo)
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; HDR-NOT: .rela.{{.*}}.dwo
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; Make sure we have enough stuff in the debug_addr to cover the address indexes
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; (6 is the last index in debug_loc.dwo, making 7 entries of 8 bytes each, 7 * 8
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; == 56 base 10 == 38 base 16)
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; HDR: .debug_addr 00000038
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; HDR-NOT: .rela.{{.*}}.dwo
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; From the code:
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; extern int c;
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; static void foo (int p)
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; {
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; int a, b;
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; unsigned int d, e;
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; for (a = 0; a < 30; a++)
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; for (d = 0; d < 30; d++)
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; for (b = 0; b < 30; b++)
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; for (e = 0; e < 30; e++)
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; {
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; int *w = &c;
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; *w &= p;
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; }
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; }
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; void
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; bar ()
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; {
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; foo (1);
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; }
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; compiled with:
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; clang -g -S -gsplit-dwarf -O1 small.c
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@c = external global i32
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; Function Attrs: nounwind uwtable
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define void @bar() #0 {
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entry:
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tail call fastcc void @foo(), !dbg !27
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ret void, !dbg !28
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}
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; Function Attrs: nounwind uwtable
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define internal fastcc void @foo() #0 {
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entry:
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tail call void @llvm.dbg.value(metadata !29, i64 0, metadata !13, metadata !{}), !dbg !30
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tail call void @llvm.dbg.value(metadata !44, i64 0, metadata !14, metadata !{}), !dbg !31
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%c.promoted9 = load i32* @c, align 4, !dbg !32, !tbaa !33
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br label %for.cond1.preheader, !dbg !31
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for.cond1.preheader: ; preds = %for.inc16, %entry
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%and.lcssa.lcssa.lcssa10 = phi i32 [ %c.promoted9, %entry ], [ %and, %for.inc16 ]
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%a.08 = phi i32 [ 0, %entry ], [ %inc17, %for.inc16 ]
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br label %for.cond4.preheader, !dbg !37
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for.cond4.preheader: ; preds = %for.inc13, %for.cond1.preheader
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%and.lcssa.lcssa7 = phi i32 [ %and.lcssa.lcssa.lcssa10, %for.cond1.preheader ], [ %and, %for.inc13 ]
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%d.06 = phi i32 [ 0, %for.cond1.preheader ], [ %inc14, %for.inc13 ]
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br label %for.cond7.preheader, !dbg !38
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for.cond7.preheader: ; preds = %for.inc10, %for.cond4.preheader
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%and.lcssa5 = phi i32 [ %and.lcssa.lcssa7, %for.cond4.preheader ], [ %and, %for.inc10 ]
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%b.03 = phi i32 [ 0, %for.cond4.preheader ], [ %inc11, %for.inc10 ]
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br label %for.body9, !dbg !39
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for.body9: ; preds = %for.body9, %for.cond7.preheader
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%and2 = phi i32 [ %and.lcssa5, %for.cond7.preheader ], [ %and, %for.body9 ], !dbg !40
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%e.01 = phi i32 [ 0, %for.cond7.preheader ], [ %inc, %for.body9 ]
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tail call void @llvm.dbg.value(metadata !41, i64 0, metadata !19, metadata !{}), !dbg !40
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%and = and i32 %and2, 1, !dbg !32
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%inc = add i32 %e.01, 1, !dbg !39
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tail call void @llvm.dbg.value(metadata !{i32 %inc}, i64 0, metadata !18, metadata !{}), !dbg !39
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%exitcond = icmp eq i32 %inc, 30, !dbg !39
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br i1 %exitcond, label %for.inc10, label %for.body9, !dbg !39
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for.inc10: ; preds = %for.body9
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%inc11 = add nsw i32 %b.03, 1, !dbg !38
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tail call void @llvm.dbg.value(metadata !{i32 %inc11}, i64 0, metadata !15, metadata !{}), !dbg !38
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%exitcond11 = icmp eq i32 %inc11, 30, !dbg !38
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br i1 %exitcond11, label %for.inc13, label %for.cond7.preheader, !dbg !38
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for.inc13: ; preds = %for.inc10
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%inc14 = add i32 %d.06, 1, !dbg !37
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tail call void @llvm.dbg.value(metadata !{i32 %inc14}, i64 0, metadata !16, metadata !{}), !dbg !37
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%exitcond12 = icmp eq i32 %inc14, 30, !dbg !37
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br i1 %exitcond12, label %for.inc16, label %for.cond4.preheader, !dbg !37
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for.inc16: ; preds = %for.inc13
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%inc17 = add nsw i32 %a.08, 1, !dbg !31
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tail call void @llvm.dbg.value(metadata !{i32 %inc17}, i64 0, metadata !14, metadata !{}), !dbg !31
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%exitcond13 = icmp eq i32 %inc17, 30, !dbg !31
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br i1 %exitcond13, label %for.end18, label %for.cond1.preheader, !dbg !31
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for.end18: ; preds = %for.inc16
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store i32 %and, i32* @c, align 4, !dbg !32, !tbaa !33
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ret void, !dbg !42
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}
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; Function Attrs: nounwind readnone
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declare void @llvm.dbg.value(metadata, i64, metadata, metadata) #1
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attributes #0 = { nounwind uwtable "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
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attributes #1 = { nounwind readnone }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!26, !43}
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!0 = metadata !{i32 786449, metadata !1, i32 12, metadata !"clang version 3.4 (trunk 191700) (llvm/trunk 191710)", i1 true, metadata !"", i32 0, metadata !2, metadata !2, metadata !3, metadata !2, metadata !2, metadata !"small.dwo"} ; [ DW_TAG_compile_unit ] [/usr/local/google/home/echristo/tmp/small.c] [DW_LANG_C99]
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!1 = metadata !{metadata !"small.c", metadata !"/usr/local/google/home/echristo/tmp"}
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!2 = metadata !{}
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!3 = metadata !{metadata !4, metadata !8}
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!4 = metadata !{i32 786478, metadata !1, metadata !5, metadata !"bar", metadata !"bar", metadata !"", i32 18, metadata !6, i1 false, i1 true, i32 0, i32 0, null, i32 0, i1 true, void ()* @bar, null, null, metadata !2, i32 19} ; [ DW_TAG_subprogram ] [line 18] [def] [scope 19] [bar]
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!5 = metadata !{i32 786473, metadata !1} ; [ DW_TAG_file_type ] [/usr/local/google/home/echristo/tmp/small.c]
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!6 = metadata !{i32 786453, i32 0, null, metadata !"", i32 0, i64 0, i64 0, i64 0, i32 0, null, metadata !7, i32 0, null, null, null} ; [ DW_TAG_subroutine_type ] [line 0, size 0, align 0, offset 0] [from ]
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!7 = metadata !{null}
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!8 = metadata !{i32 786478, metadata !1, metadata !5, metadata !"foo", metadata !"foo", metadata !"", i32 2, metadata !9, i1 true, i1 true, i32 0, i32 0, null, i32 256, i1 true, void ()* @foo, null, null, metadata !12, i32 3} ; [ DW_TAG_subprogram ] [line 2] [local] [def] [scope 3] [foo]
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!9 = metadata !{i32 786453, i32 0, null, metadata !"", i32 0, i64 0, i64 0, i64 0, i32 0, null, metadata !10, i32 0, null, null, null} ; [ DW_TAG_subroutine_type ] [line 0, size 0, align 0, offset 0] [from ]
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!10 = metadata !{null, metadata !11}
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!11 = metadata !{i32 786468, null, null, metadata !"int", i32 0, i64 32, i64 32, i64 0, i32 0, i32 5} ; [ DW_TAG_base_type ] [int] [line 0, size 32, align 32, offset 0, enc DW_ATE_signed]
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!12 = metadata !{metadata !13, metadata !14, metadata !15, metadata !16, metadata !18, metadata !19}
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!13 = metadata !{i32 786689, metadata !8, metadata !"p", metadata !5, i32 16777218, metadata !11, i32 0, i32 0} ; [ DW_TAG_arg_variable ] [p] [line 2]
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!14 = metadata !{i32 786688, metadata !8, metadata !"a", metadata !5, i32 4, metadata !11, i32 0, i32 0} ; [ DW_TAG_auto_variable ] [a] [line 4]
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!15 = metadata !{i32 786688, metadata !8, metadata !"b", metadata !5, i32 4, metadata !11, i32 0, i32 0} ; [ DW_TAG_auto_variable ] [b] [line 4]
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!16 = metadata !{i32 786688, metadata !8, metadata !"d", metadata !5, i32 5, metadata !17, i32 0, i32 0} ; [ DW_TAG_auto_variable ] [d] [line 5]
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!17 = metadata !{i32 786468, null, null, metadata !"unsigned int", i32 0, i64 32, i64 32, i64 0, i32 0, i32 7} ; [ DW_TAG_base_type ] [unsigned int] [line 0, size 32, align 32, offset 0, enc DW_ATE_unsigned]
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!18 = metadata !{i32 786688, metadata !8, metadata !"e", metadata !5, i32 5, metadata !17, i32 0, i32 0} ; [ DW_TAG_auto_variable ] [e] [line 5]
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!19 = metadata !{i32 786688, metadata !20, metadata !"w", metadata !5, i32 12, metadata !25, i32 0, i32 0} ; [ DW_TAG_auto_variable ] [w] [line 12]
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!20 = metadata !{i32 786443, metadata !1, metadata !21, i32 11, i32 0, i32 4} ; [ DW_TAG_lexical_block ] [/usr/local/google/home/echristo/tmp/small.c]
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!21 = metadata !{i32 786443, metadata !1, metadata !22, i32 10, i32 0, i32 3} ; [ DW_TAG_lexical_block ] [/usr/local/google/home/echristo/tmp/small.c]
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!22 = metadata !{i32 786443, metadata !1, metadata !23, i32 9, i32 0, i32 2} ; [ DW_TAG_lexical_block ] [/usr/local/google/home/echristo/tmp/small.c]
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!23 = metadata !{i32 786443, metadata !1, metadata !24, i32 8, i32 0, i32 1} ; [ DW_TAG_lexical_block ] [/usr/local/google/home/echristo/tmp/small.c]
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!24 = metadata !{i32 786443, metadata !1, metadata !8, i32 7, i32 0, i32 0} ; [ DW_TAG_lexical_block ] [/usr/local/google/home/echristo/tmp/small.c]
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!25 = metadata !{i32 786447, null, null, metadata !"", i32 0, i64 64, i64 64, i64 0, i32 0, metadata !11} ; [ DW_TAG_pointer_type ] [line 0, size 64, align 64, offset 0] [from int]
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!26 = metadata !{i32 2, metadata !"Dwarf Version", i32 4}
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!27 = metadata !{i32 20, i32 0, metadata !4, null}
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!28 = metadata !{i32 21, i32 0, metadata !4, null}
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!29 = metadata !{i32 1}
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!30 = metadata !{i32 2, i32 0, metadata !8, null}
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!31 = metadata !{i32 7, i32 0, metadata !24, null}
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!32 = metadata !{i32 13, i32 0, metadata !20, null}
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!33 = metadata !{metadata !34, metadata !34, i64 0}
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!34 = metadata !{metadata !"int", metadata !35, i64 0}
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!35 = metadata !{metadata !"omnipotent char", metadata !36, i64 0}
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!36 = metadata !{metadata !"Simple C/C++ TBAA"}
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!37 = metadata !{i32 8, i32 0, metadata !23, null} ; [ DW_TAG_imported_declaration ]
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!38 = metadata !{i32 9, i32 0, metadata !22, null}
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!39 = metadata !{i32 10, i32 0, metadata !21, null}
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!40 = metadata !{i32 12, i32 0, metadata !20, null}
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!41 = metadata !{i32* @c}
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!42 = metadata !{i32 15, i32 0, metadata !8, null}
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!43 = metadata !{i32 1, metadata !"Debug Info Version", i32 1}
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!44 = metadata !{i32 0}
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