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025d4791c0
This reverts D53469, which changed llvm's DWARF emission to emit DW_AT_call_return_pc as a function-local offset. Such an encoding is not compatible with post-link block re-ordering tools and isn't standards- compliant. In addition to reverting back to the original DW_AT_call_return_pc encoding, teach lldb how to fix up DW_AT_call_return_pc when the address comes from an object file pointed-to by a debug map. While doing this I noticed that lldb's support for tail calls that cross a DSO/object file boundary wasn't covered, so I added tests for that. This latter case exercises the newly added return PC fixup. The dsymutil changes in this patch were originally included in D49887: the associated test should be sufficient to test DW_AT_call_return_pc encoding purely on the llvm side. Differential Revision: https://reviews.llvm.org/D72489
88 lines
3.2 KiB
LLVM
88 lines
3.2 KiB
LLVM
; RUN: llc -split-dwarf-file=test.dwo -dwarf-version=4 %s -mtriple=i386-unknown-linux-gnu -filetype=obj -o - | \
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; RUN: llvm-dwarfdump -v - | FileCheck %s -check-prefix=DWARF4
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; RUN: llc -split-dwarf-file=test.dwo -dwarf-version=5 %s -mtriple=i386-unknown-linux-gnu -filetype=obj -o - | \
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; RUN: llvm-dwarfdump -v - | FileCheck %s -check-prefix=DWARF5
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; Source:
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; void foo() {
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; }
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;
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; void bar() {
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; foo();
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; }
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; DWARF4: .debug_info contents:
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; DWARF4: Compile Unit:{{.*}}version = 0x0004
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; DWARF4-NOT: Compile Unit
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; DWARF4: DW_TAG_compile_unit
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; DWARF4-NOT: DW_TAG_{{.*}}
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; DWARF4: DW_AT_GNU_dwo_name{{.*}}test.dwo
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; DWARF4: DW_AT_GNU_addr_base{{.*}}0x00000000
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; DWARF4: DW_TAG_GNU_call_site
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; DWARF4: DW_AT_low_pc [DW_FORM_GNU_addr_index] (indexed (00000002) address = 0x0000000000000018 ".text")
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; DWARF4: .debug_addr contents:
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; DWARF4-NEXT: 0x00000000: Addr Section: length = 0x00000000, version = 0x0004, addr_size = 0x04, seg_size = 0x00
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; DWARF4-NEXT: Addrs: [
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; DWARF4-NEXT: 0x00000000
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; DWARF4-NEXT: 0x00000010
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; DWARF4-NEXT: 0x00000018
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; DWARF4-NEXT: ]
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; DWARF5: .debug_info contents:
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; DWARF5: Compile Unit:{{.*}}version = 0x0005
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; DWARF5-NOT: Compile Unit
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; DWARF5: DW_TAG_skeleton_unit
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; DWARF5-NOT: DW_TAG_{{.*}}
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; DWARF5: DW_AT_dwo_name{{.*}}test.dwo
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; DWARF5: DW_AT_addr_base{{.*}}0x00000008
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; DWARF5: DW_AT_low_pc [DW_FORM_addrx] (indexed (00000000) address = 0x0000000000000000 ".text")
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; DWARF5: DW_AT_call_return_pc [DW_FORM_addrx] (indexed (00000002) address = 0x0000000000000018 ".text")
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; DWARF5: .debug_addr contents:
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; DWARF5-NEXT: 0x00000000: Addr Section: length = 0x00000010, version = 0x0005, addr_size = 0x04, seg_size = 0x00
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; DWARF5-NEXT: Addrs: [
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; DWARF5-NEXT: 0x00000000
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; DWARF5-NEXT: 0x00000010
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; DWARF5-NEXT: 0x00000018
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; DWARF5-NEXT: ]
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; ModuleID = './test.c'
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source_filename = "./test.c"
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target datalayout = "e-m:e-p:32:32-f64:32:64-f80:32-n8:16:32-S128"
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target triple = "i386-unknown-linux-gnu"
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; Function Attrs: noinline nounwind optnone
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define void @foo() #0 !dbg !8 {
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entry:
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ret void, !dbg !12
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}
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; Function Attrs: noinline nounwind optnone
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define void @bar() #0 !dbg !13 {
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entry:
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call void @foo(), !dbg !14
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ret void, !dbg !14
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}
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attributes #0 = { noinline nounwind optnone }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!3, !4, !5, !6}
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!llvm.ident = !{!7}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 6.0.1", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
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!1 = !DIFile(filename: "test.c", directory: "/tmp")
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!2 = !{}
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!3 = !{i32 1, !"NumRegisterParameters", i32 0}
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!4 = !{i32 2, !"Dwarf Version", i32 5}
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!5 = !{i32 2, !"Debug Info Version", i32 3}
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!6 = !{i32 1, !"wchar_size", i32 4}
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!7 = !{!"clang version 6.0.1"}
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!8 = distinct !DISubprogram(name: "foo", scope: !9, file: !9, line: 1, type: !10, isLocal: false, isDefinition: true, scopeLine: 1, isOptimized: false, unit: !0)
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!9 = !DIFile(filename: "./test.c", directory: "/tmp")
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!10 = !DISubroutineType(types: !11)
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!11 = !{null}
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!12 = !DILocation(line: 2, column: 3, scope: !8)
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!13 = distinct !DISubprogram(name: "bar", scope: !9, file: !9, line: 5, type: !10, isLocal: false, isDefinition: true, flags: DIFlagAllCallsDescribed, scopeLine: 5, isOptimized: false, unit: !0)
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!14 = !DILocation(line: 6, column: 3, scope: !13)
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