forked from OSchip/llvm-project
[ObjectYAML][ELF] Add support for emitting the .debug_abbrev section.
This patch enables yaml2elf emit the .debug_abbrev section. The generated .debug_abbrev is verified using `llvm-dwarfdump`. Known issues that will be addressed later: - Current implementation doesn't support generating multiple abbreviation tables in one .debug_abbrev section. Reviewed By: jhenderson, grimar Differential Revision: https://reviews.llvm.org/D81820
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Xing GUO
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ad6024e29f
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1f391afbf4
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@ -34,6 +34,8 @@ SetVector<StringRef> DWARFYAML::Data::getUsedSectionNames() const {
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SecNames.insert("debug_line");
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if (!DebugAddr.empty())
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SecNames.insert("debug_addr");
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if (!AbbrevDecls.empty())
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SecNames.insert("debug_abbrev");
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return SecNames;
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}
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@ -939,6 +939,8 @@ Expected<uint64_t> emitDWARF(typename ELFT::Shdr &SHeader, StringRef Name,
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Err = DWARFYAML::emitDebugLine(*OS, DWARF);
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else if (Name == ".debug_addr")
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Err = DWARFYAML::emitDebugAddr(*OS, DWARF);
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else if (Name == ".debug_abbrev")
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Err = DWARFYAML::emitDebugAbbrev(*OS, DWARF);
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else
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llvm_unreachable("unexpected emitDWARF() call");
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@ -0,0 +1,241 @@
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## Test that yaml2obj emits .debug_abbrev section.
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## a) Generate the .debug_abbrev section from the "DWARF" entry.
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# RUN: yaml2obj --docnum=1 %s -o %t1.o
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# RUN: llvm-readobj --sections --section-data %t1.o | \
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# RUN: FileCheck -DSIZE=38 -DADDRALIGN=1 %s --check-prefixes=SHDR,CONTENT
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# SHDR: Index: 1
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# SHDR-NEXT: Name: .debug_abbrev (1)
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# SHDR-NEXT: Type: SHT_PROGBITS (0x1)
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# SHDR-NEXT: Flags [ (0x0)
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# SHDR-NEXT: ]
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# SHDR-NEXT: Address: 0x0
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# SHDR-NEXT: Offset: 0x40
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# SHDR-NEXT: Size: [[SIZE]]
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# SHDR-NEXT: Link: 0
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# SHDR-NEXT: Info: 0
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# SHDR-NEXT: AddressAlignment: [[ADDRALIGN]]
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# SHDR-NEXT: EntrySize: 0
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# CONTENT-NEXT: SectionData (
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# CONTENT-NEXT: 000: 01110125 0E130503
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## ^- abbreviation code ULEB128 ^- DW_FORM_strp ULEB128
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## ^- DW_TAG_compile_unit ULEB128 ^- DW_AT_language ULEB128
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## ^- DW_CHILDREN_yes 1-byte ^- DW_FORM_data2 ULEB128
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## ^- DW_AT_producer ULEB128 ^- DW_AT_name ULEB128
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##
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## CONTENT: 1A000002 2E011101
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## ^- DW_AT_strx ULEB128 ^- DW_TAG_subprogram ULEB128
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## ^--- terminating entry ^- DW_CHILDREN_yes 1-byte
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## ^- abbreviation code ULEB128 ^- DW_AT_low_pc ULEB128
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## ^- DW_FORM_addr ULEB128
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##
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# CONTENT-NEXT: 0010: 121B0000 03060081
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## ^- DW_AT_high_pc ULEB128 ^- abbreviation code ULEB128
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## ^- DW_FORM_addrx ULEB128 ^- Tag: value UELB128
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## ^--- terminating entry ^- DW_CHILDREN_no 1-byte
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## ^- DW_AT_call_pc ULEB128 (0x81)
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##
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# CONTENT: 01810104 02A04021
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## -- ^- Form: reserved ULEB128
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## ^--- Form: invalid ULEB128 (0x81) ^--- Attribute: reserved ULEB128 (0x2020)
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## ^- Attribute: reserved ULEB128 ^- DW_FORM_implicit_const ULEB128
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##
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# CONTENT-NEXT: 0020: CEC2F105 0000
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## ^------- Value SLEB128 (12345678) ^--- terminating entry
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# CONTENT-NEXT: )
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--- !ELF
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FileHeader:
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Class: ELFCLASS64
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Data: ELFDATA2LSB
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Type: ET_EXEC
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Machine: EM_X86_64
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DWARF:
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debug_abbrev:
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- Code: 1
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Tag: DW_TAG_compile_unit
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Children: DW_CHILDREN_yes
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Attributes:
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- Attribute: DW_AT_producer
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Form: DW_FORM_strp
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- Attribute: DW_AT_language
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Form: DW_FORM_data2
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- Attribute: DW_AT_name
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Form: DW_FORM_strx
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- Code: 2
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Tag: DW_TAG_subprogram
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Children: DW_CHILDREN_yes
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Attributes:
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- Attribute: DW_AT_low_pc
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Form: DW_FORM_addr
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- Attribute: DW_AT_high_pc
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Form: DW_FORM_addrx
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- Code: 3
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## Test a reserved tag value.
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Tag: 0x06
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Children: DW_CHILDREN_no
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Attributes:
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## Test an attribute value that is more than one byte.
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- Attribute: DW_AT_call_pc
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## Test a form value that is more than one byte.
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Form: 0x81
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## Test a reserved attribute value.
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- Attribute: 0x04
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## Test a reserved form value.
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Form: 0x02
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- Attribute: 0x2020
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## Test one special attribute form DW_FORM_implicit_const,
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## who is followed by a SLEB128 value.
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Form: DW_FORM_implicit_const
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Value: 12345678
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## b) Generate the .debug_abbrev section from raw section content.
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# RUN: yaml2obj --docnum=2 %s -o %t2.o
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# RUN: llvm-readobj --sections --section-data %t2.o | \
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# RUN: FileCheck -DADDRALIGN=0 -DSIZE=3 %s --check-prefixes=SHDR,ARBITRARY-CONTENT
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# ARBITRARY-CONTENT-NEXT: SectionData (
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# ARBITRARY-CONTENT-NEXT: 0000: 112233
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# ARBITRARY-CONTENT-NEXT: )
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--- !ELF
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FileHeader:
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Class: ELFCLASS64
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Data: ELFDATA2LSB
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Type: ET_EXEC
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Machine: EM_X86_64
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Sections:
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- Name: .debug_abbrev
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Type: SHT_PROGBITS
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Content: "112233"
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## c) Generate the .debug_abbrev section when the "Size" is specified.
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# RUN: yaml2obj --docnum=3 %s -o %t3.o
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# RUN: llvm-readobj --sections --section-data %t3.o | \
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# RUN: FileCheck -DSIZE=16 -DADDRALIGN=0 %s --check-prefixes=SHDR,SIZE
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# SIZE-NEXT: SectionData (
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# SIZE-NEXT: 0000: 00000000 00000000 00000000 00000000
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# SIZE-NEXT: )
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--- !ELF
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FileHeader:
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Class: ELFCLASS64
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Data: ELFDATA2LSB
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Type: ET_EXEC
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Machine: EM_X86_64
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Sections:
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- Name: .debug_abbrev
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Type: SHT_PROGBITS
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Size: 0x10
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## d) Test that yaml2obj emits an error message when both the "Size" and the
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## "debug_abbrev" entry are specified at the same time.
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# RUN: not yaml2obj --docnum=4 %s 2>&1 | FileCheck %s --check-prefix=ERROR
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# ERROR: yaml2obj: error: cannot specify section '.debug_abbrev' contents in the 'DWARF' entry and the 'Content' or 'Size' in the 'Sections' entry at the same time
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--- !ELF
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FileHeader:
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Class: ELFCLASS64
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Data: ELFDATA2LSB
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Type: ET_EXEC
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Machine: EM_X86_64
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Sections:
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- Name: .debug_abbrev
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Type: SHT_PROGBITS
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Size: 0x10
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DWARF:
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debug_abbrev:
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- Code: 1
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Tag: DW_TAG_compile_unit
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Children: DW_CHILDREN_no
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Attributes: []
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## e) Test that yaml2obj emits an error message when both the "Content" and the
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## "debug_abbrev" entry are specified at the same time.
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# RUN: not yaml2obj --docnum=5 %s 2>&1 | FileCheck %s --check-prefix=ERROR
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--- !ELF
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FileHeader:
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Class: ELFCLASS64
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Data: ELFDATA2LSB
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Type: ET_EXEC
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Machine: EM_X86_64
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Sections:
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- Name: .debug_abbrev
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Type: SHT_PROGBITS
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Content: "00"
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DWARF:
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debug_abbrev:
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- Code: 1
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Tag: DW_TAG_compile_unit
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Children: DW_CHILDREN_no
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Attributes: []
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## f) Test that all the properties can be overridden by the section header when
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## the "debug_abbrev" entry doesn't exist.
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# RUN: yaml2obj --docnum=6 %s -o %t6.o
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# RUN: llvm-readelf --sections %t6.o | FileCheck %s --check-prefix=OVERRIDDEN
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# OVERRIDDEN: [Nr] Name Type Address Off Size ES Flg Lk Inf Al
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# OVERRIDDEN: [ 1] .debug_abbrev STRTAB 0000000000002020 000050 000005 01 A 2 1 2
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# OVERRIDDEN-NEXT: [ 2] .sec STRTAB 0000000000000000 000055 000000 00 0 0 0
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--- !ELF
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FileHeader:
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Class: ELFCLASS64
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Data: ELFDATA2LSB
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Type: ET_EXEC
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Machine: EM_X86_64
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Sections:
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- Name: .debug_abbrev
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Type: SHT_STRTAB ## SHT_PROGBITS by default.
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Flags: [SHF_ALLOC] ## 0 by default.
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Link: .sec ## 0 by default.
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EntSize: 1 ## 0 by default.
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Info: 1 ## 0 by default.
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AddressAlign: 2 ## 0 by default.
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Address: 0x2020 ## 0x00 by default.
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Offset: 0x50 ## 0x40 for the first section.
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Size: 0x05 ## Set the "Size" so that we can reuse the check tag "OVERRIDDEN".
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- Name: .sec ## Linked by .debug_abbrev.
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Type: SHT_STRTAB
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## g) Test that all the properties can be overridden by the section header when
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## the "debug_abbrev" entry exists.
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# RUN: yaml2obj --docnum=7 %s -o %t7.o
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# RUN: llvm-readelf --sections %t7.o | FileCheck %s --check-prefix=OVERRIDDEN
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--- !ELF
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FileHeader:
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Class: ELFCLASS64
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Data: ELFDATA2LSB
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Type: ET_EXEC
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Machine: EM_X86_64
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Sections:
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- Name: .debug_abbrev
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Type: SHT_STRTAB ## SHT_PROGBITS by default.
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Flags: [SHF_ALLOC] ## 0 by default.
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Link: .sec ## 0 by default.
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EntSize: 1 ## 0 by default.
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Info: 1 ## 0 by default.
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AddressAlign: 2 ## 1 by default.
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Address: 0x2020 ## 0x00 by default.
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Offset: 0x50 ## 0x40 for the first section.
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- Name: .sec ## Linked by .debug_abbrev.
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Type: SHT_STRTAB
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DWARF:
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debug_abbrev:
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- Code: 1
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Tag: DW_TAG_compile_unit
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Children: DW_CHILDREN_no
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Attributes: []
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