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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
92 lines
4.6 KiB
LLVM
92 lines
4.6 KiB
LLVM
; REQUIRES: object-emission
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; RUN: llvm-link %s %p/type-unique-simple-b.ll -S -o %t
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; RUN: cat %t | FileCheck %s -check-prefix=LINK
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; RUN: %llc_dwarf -filetype=obj -O0 < %t > %t2
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; RUN: llvm-dwarfdump -debug-dump=info %t2 | FileCheck %s
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; Make sure the backend generates a single DIE and uses ref_addr.
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; CHECK: 0x[[BASE:.*]]: DW_TAG_structure_type
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; CHECK-NEXT: DW_AT_name {{.*}} = "Base"
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; CHECK-NOT: DW_TAG_structure_type
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; CHECK: 0x[[INT:.*]]: DW_TAG_base_type
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; CHECK-NEXT: DW_AT_name {{.*}} = "int"
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; CHECK-NOT: DW_TAG_base_type
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; CHECK: DW_TAG_compile_unit
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; CHECK: DW_TAG_formal_parameter
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; CHECK: DW_AT_type [DW_FORM_ref_addr] {{.*}}[[INT]])
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; CHECK: DW_TAG_variable
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; CHECK: DW_AT_type [DW_FORM_ref_addr] {{.*}}[[BASE]])
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; Make sure llvm-link only generates a single copy of the struct.
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; LINK: DW_TAG_structure_type
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; LINK-NOT: DW_TAG_structure_type
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; Content of header files:
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; struct Base {
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; int a;
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; };
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; Content of foo.cpp:
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;
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; #include "a.hpp"
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; void f(int a) {
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; Base t;
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; }
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; Content of bar.cpp:
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;
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; #include "a.hpp"
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; void f(int);
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; void g(int a) {
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; Base t;
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; }
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; int main() {
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; f(0);
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; g(1);
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; return 0;
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; }
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; ModuleID = 'foo.cpp'
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%struct.Base = type { i32 }
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; Function Attrs: nounwind ssp uwtable
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define void @_Z1fi(i32 %a) #0 {
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entry:
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%a.addr = alloca i32, align 4
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%t = alloca %struct.Base, align 4
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store i32 %a, i32* %a.addr, align 4
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call void @llvm.dbg.declare(metadata !{i32* %a.addr}, metadata !15, metadata !{i32 786690}), !dbg !16
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call void @llvm.dbg.declare(metadata !{%struct.Base* %t}, metadata !17, metadata !{i32 786690}), !dbg !18
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ret void, !dbg !19
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}
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; Function Attrs: nounwind readnone
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declare void @llvm.dbg.declare(metadata, metadata, metadata) #1
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attributes #0 = { nounwind ssp uwtable "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "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 = !{!14, !20}
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!0 = metadata !{i32 786449, metadata !1, i32 4, metadata !"clang version 3.4 (http://llvm.org/git/clang.git c23b1db6268c8e7ce64026d57d1510c1aac200a0) (http://llvm.org/git/llvm.git 09b98fe3978eddefc2145adc1056cf21580ce945)", i1 false, metadata !"", i32 0, metadata !2, metadata !3, metadata !9, metadata !2, metadata !2, metadata !""} ; [ DW_TAG_compile_unit ] [/Users/mren/c_testing/type_unique_air/simple/foo.cpp] [DW_LANG_C_plus_plus]
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!1 = metadata !{metadata !"foo.cpp", metadata !"/Users/mren/c_testing/type_unique_air/simple"}
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!2 = metadata !{}
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!3 = metadata !{metadata !4}
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!4 = metadata !{i32 786451, metadata !5, null, metadata !"Base", i32 1, i64 32, i64 32, i32 0, i32 0, null, metadata !6, i32 0, null, null, metadata !"_ZTS4Base"} ; [ DW_TAG_structure_type ] [Base] [line 1, size 32, align 32, offset 0] [def] [from ]
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!5 = metadata !{metadata !"./a.hpp", metadata !"/Users/mren/c_testing/type_unique_air/simple"}
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!6 = metadata !{metadata !7}
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!7 = metadata !{i32 786445, metadata !5, metadata !"_ZTS4Base", metadata !"a", i32 2, i64 32, i64 32, i64 0, i32 0, metadata !8} ; [ DW_TAG_member ] [a] [line 2, size 32, align 32, offset 0] [from int]
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!8 = 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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!9 = metadata !{metadata !10}
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!10 = metadata !{i32 786478, metadata !1, metadata !11, metadata !"f", metadata !"f", metadata !"_Z1fi", i32 3, metadata !12, i1 false, i1 true, i32 0, i32 0, null, i32 256, i1 false, void (i32)* @_Z1fi, null, null, metadata !2, i32 3} ; [ DW_TAG_subprogram ] [line 3] [def] [f]
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!11 = metadata !{i32 786473, metadata !1} ; [ DW_TAG_file_type ] [/Users/mren/c_testing/type_unique_air/simple/foo.cpp]
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!12 = metadata !{i32 786453, i32 0, null, metadata !"", i32 0, i64 0, i64 0, i64 0, i32 0, null, metadata !13, i32 0, null, null, null} ; [ DW_TAG_subroutine_type ] [line 0, size 0, align 0, offset 0] [from ]
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!13 = metadata !{null, metadata !8}
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!14 = metadata !{i32 2, metadata !"Dwarf Version", i32 2}
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!15 = metadata !{i32 786689, metadata !10, metadata !"a", metadata !11, i32 16777219, metadata !8, i32 0, i32 0} ; [ DW_TAG_arg_variable ] [a] [line 3]
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!16 = metadata !{i32 3, i32 0, metadata !10, null}
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!17 = metadata !{i32 786688, metadata !10, metadata !"t", metadata !11, i32 4, metadata !4, i32 0, i32 0} ; [ DW_TAG_auto_variable ] [t] [line 4]
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!18 = metadata !{i32 4, i32 0, metadata !10, null}
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!19 = metadata !{i32 5, i32 0, metadata !10, null}
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!20 = metadata !{i32 1, metadata !"Debug Info Version", i32 1}
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