e1f8c8a16f
Summary: This patch stems from the discussion D68270 (including some offline talks). The idea is to provide an "incremental" api for parsing location lists, which will avoid caching or materializing parsed data. An additional goal is to provide a high level location list api, which abstracts the differences between different encoding schemes, and can be used by users which don't care about those (such as LLDB). This patch implements the first part. It implements a call-back based "visitLocationList" api. This function parses a single location list, calling a user-specified callback for each entry. This is going to be the base api, which other location list functions (right now, just the dumping code) are going to be based on. Future patches will do something similar for the v4 location lists, and add a mechanism to translate raw entries into concrete address ranges. Reviewers: dblaikie, probinson, JDevlieghere, aprantl, SouraVX Subscribers: hiraditya, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D69672
120 lines
6.1 KiB
LLVM
120 lines
6.1 KiB
LLVM
; RUN: llc -mtriple=x86_64-pc-linux -filetype=obj -function-sections -o %t < %s
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; RUN: llvm-dwarfdump -v -debug-info -debug-loclists %t | FileCheck %s
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; CHECK: DW_TAG_variable
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; FIXME: Use DW_FORM_loclistx to reduce relocations
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; CHECK-NEXT: DW_AT_location [DW_FORM_sec_offset] (0x0000000c
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; CHECK-NEXT: [0x0000000000000000, 0x0000000000000003): DW_OP_consts +3, DW_OP_stack_value
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; CHECK-NEXT: [0x0000000000000003, 0x0000000000000004): DW_OP_consts +4, DW_OP_stack_value)
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; CHECK-NEXT: DW_AT_name {{.*}} "y"
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; CHECK: DW_TAG_variable
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; FIXME: Use DW_FORM_loclistx to reduce relocations
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; CHECK-NEXT: DW_AT_location [DW_FORM_sec_offset] (0x0000001d
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; CHECK-NEXT: Addr idx 0 (w/ length 3): DW_OP_consts +5, DW_OP_stack_value)
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; CHECK-NEXT: DW_AT_name {{.*}} "x"
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; CHECK: DW_TAG_variable
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; FIXME: Use DW_FORM_loclistx to reduce relocations
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; CHECK-NEXT: DW_AT_location [DW_FORM_sec_offset] (0x00000025
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; CHECK-NEXT: [0x0000000000000003, 0x0000000000000004): DW_OP_reg0 RAX)
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; CHECK-NEXT: DW_AT_name {{.*}} "r"
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; CHECK: .debug_loclists contents:
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; CHECK-NEXT: 0x00000000: locations list header: length = 0x00000029, version = 0x0005, addr_size = 0x08, seg_size = 0x00, offset_entry_count = 0x00000000
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; Don't use startx_length if there's more than one entry, because the shared
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; base address will be useful for both the range that does start at the start of
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; the function, and the one that doesn't.
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; CHECK-NEXT: 0x0000000c:
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; CHECK-NEXT: DW_LLE_base_addressx (0x0000000000000000)
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; CHECK-NEXT: DW_LLE_offset_pair (0x0000000000000000, 0x0000000000000003)
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; CHECK-NEXT: => [0x0000000000000000, 0x0000000000000003): DW_OP_consts +3, DW_OP_stack_value
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; CHECK-NEXT: DW_LLE_offset_pair (0x0000000000000003, 0x0000000000000004)
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; CHECK-NEXT: => [0x0000000000000003, 0x0000000000000004): DW_OP_consts +4, DW_OP_stack_value
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; CHECK-NEXT: DW_LLE_end_of_list ()
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; Show that startx_length can be used when the address range starts at the start of the function.
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; CHECK: 0x0000001d:
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; CHECK-NEXT: DW_LLE_startx_length (0x0000000000000000, 0x0000000000000003)
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; CHECK-NEXT: => Addr idx 0 (w/ length 3): DW_OP_consts +5, DW_OP_stack_value
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; CHECK-NEXT: DW_LLE_end_of_list ()
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; And use a base address when the range doesn't start at an existing/useful
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; address in the pool.
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; CHECK: 0x00000025:
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; CHECK-NEXT: DW_LLE_base_addressx (0x0000000000000000)
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; CHECK-NEXT: DW_LLE_offset_pair (0x0000000000000003, 0x0000000000000004)
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; CHECK-NEXT: => [0x0000000000000003, 0x0000000000000004): DW_OP_reg0 RAX
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; CHECK-NEXT: DW_LLE_end_of_list ()
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; Built with clang -O3 -ffunction-sections from source:
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;
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; int f1(int i, int j) {
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; int x = 5;
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; int y = 3;
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; int r = i + j;
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; int undef;
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; x = undef;
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; y = 4;
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; return r;
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; }
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; void f2() {
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; }
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; Function Attrs: norecurse nounwind readnone uwtable
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define dso_local i32 @_Z2f1ii(i32 %i, i32 %j) local_unnamed_addr !dbg !7 {
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entry:
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call void @llvm.dbg.value(metadata i32 %i, metadata !12, metadata !DIExpression()), !dbg !18
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call void @llvm.dbg.value(metadata i32 %j, metadata !13, metadata !DIExpression()), !dbg !18
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call void @llvm.dbg.value(metadata i32 5, metadata !14, metadata !DIExpression()), !dbg !18
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call void @llvm.dbg.value(metadata i32 3, metadata !15, metadata !DIExpression()), !dbg !18
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%add = add nsw i32 %j, %i, !dbg !19
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call void @llvm.dbg.value(metadata i32 %add, metadata !16, metadata !DIExpression()), !dbg !18
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call void @llvm.dbg.value(metadata i32 undef, metadata !14, metadata !DIExpression()), !dbg !18
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call void @llvm.dbg.value(metadata i32 4, metadata !15, metadata !DIExpression()), !dbg !18
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ret i32 %add, !dbg !20
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}
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; Function Attrs: norecurse nounwind readnone uwtable
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define dso_local void @_Z2f2v() local_unnamed_addr !dbg !21 {
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entry:
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ret void, !dbg !24
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}
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; Function Attrs: nounwind readnone speculatable willreturn
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declare void @llvm.dbg.value(metadata, metadata, metadata)
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!3, !4, !5}
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!llvm.ident = !{!6}
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!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus_14, file: !1, producer: "clang version 10.0.0 (trunk 374581) (llvm/trunk 374579)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, nameTableKind: None)
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!1 = !DIFile(filename: "loc2.cpp", directory: "/usr/local/google/home/blaikie/dev/scratch", checksumkind: CSK_MD5, checksum: "91e0069c680e2a63f4f885ec93f5d07e")
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!2 = !{}
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!3 = !{i32 2, !"Dwarf Version", i32 5}
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!4 = !{i32 2, !"Debug Info Version", i32 3}
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!5 = !{i32 1, !"wchar_size", i32 4}
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!6 = !{!"clang version 10.0.0 (trunk 374581) (llvm/trunk 374579)"}
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!7 = distinct !DISubprogram(name: "f1", linkageName: "_Z2f1ii", scope: !1, file: !1, line: 1, type: !8, scopeLine: 1, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !11)
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!8 = !DISubroutineType(types: !9)
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!9 = !{!10, !10, !10}
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!10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
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!11 = !{!12, !13, !14, !15, !16, !17}
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!12 = !DILocalVariable(name: "i", arg: 1, scope: !7, file: !1, line: 1, type: !10)
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!13 = !DILocalVariable(name: "j", arg: 2, scope: !7, file: !1, line: 1, type: !10)
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!14 = !DILocalVariable(name: "x", scope: !7, file: !1, line: 2, type: !10)
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!15 = !DILocalVariable(name: "y", scope: !7, file: !1, line: 3, type: !10)
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!16 = !DILocalVariable(name: "r", scope: !7, file: !1, line: 4, type: !10)
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!17 = !DILocalVariable(name: "undef", scope: !7, file: !1, line: 5, type: !10)
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!18 = !DILocation(line: 0, scope: !7)
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!19 = !DILocation(line: 4, column: 13, scope: !7)
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!20 = !DILocation(line: 8, column: 3, scope: !7)
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!21 = distinct !DISubprogram(name: "f2", linkageName: "_Z2f2v", scope: !1, file: !1, line: 10, type: !22, scopeLine: 10, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !2)
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!22 = !DISubroutineType(types: !23)
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!23 = !{null}
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!24 = !DILocation(line: 11, column: 1, scope: !21)
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