dyn-symbols.test
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## In this test we test that dynamic symbols are dumped as expected.
## Case 1: Dynamic symbol table found via the DT_SYMTAB dynamic tag.
# RUN: yaml2obj --docnum=1 %s -o %t1.so
# RUN: llvm-readobj --dyn-symbols %t1.so 2>&1 \
# RUN: | FileCheck %s --implicit-check-not="warning:" --check-prefix=DYNSYMS-LLVM
# RUN: llvm-readelf --dyn-symbols %t1.so 2>&1 \
# RUN: | FileCheck %s --implicit-check-not="warning:" --check-prefix=DYNSYMS-GNU
# DYNSYMS-LLVM: DynamicSymbols [
# DYNSYMS-LLVM-NEXT: Symbol {
# DYNSYMS-LLVM-NEXT: Name: (0)
# DYNSYMS-LLVM-NEXT: Value: 0x0
# DYNSYMS-LLVM-NEXT: Size: 0
# DYNSYMS-LLVM-NEXT: Binding: Local (0x0)
# DYNSYMS-LLVM-NEXT: Type: None (0x0)
# DYNSYMS-LLVM-NEXT: Other: 0
# DYNSYMS-LLVM-NEXT: Section: Undefined (0x0)
# DYNSYMS-LLVM-NEXT: }
# DYNSYMS-LLVM-NEXT: Symbol {
# DYNSYMS-LLVM-NEXT: Name: foo (5)
# DYNSYMS-LLVM-NEXT: Value: 0x0
# DYNSYMS-LLVM-NEXT: Size: 0
# DYNSYMS-LLVM-NEXT: Binding: Local (0x0)
# DYNSYMS-LLVM-NEXT: Type: None (0x0)
# DYNSYMS-LLVM-NEXT: Other: 0
# DYNSYMS-LLVM-NEXT: Section: Undefined (0x0)
# DYNSYMS-LLVM-NEXT: }
# DYNSYMS-LLVM-NEXT: Symbol {
# DYNSYMS-LLVM-NEXT: Name: bar (1)
# DYNSYMS-LLVM-NEXT: Value: 0x0
# DYNSYMS-LLVM-NEXT: Size: 0
# DYNSYMS-LLVM-NEXT: Binding: Local (0x0)
# DYNSYMS-LLVM-NEXT: Type: None (0x0)
# DYNSYMS-LLVM-NEXT: Other: 0
# DYNSYMS-LLVM-NEXT: Section: Undefined (0x0)
# DYNSYMS-LLVM-NEXT: }
# DYNSYMS-LLVM-NEXT: ]
# DYNSYMS-GNU: Symbol table '.dynsym' contains 3 entries:
# DYNSYMS-GNU-NEXT: Num: Value Size Type Bind Vis Ndx Name
# DYNSYMS-GNU-NEXT: 0: 0000000000000000 0 NOTYPE LOCAL DEFAULT UND
# DYNSYMS-GNU-NEXT: 1: 0000000000000000 0 NOTYPE LOCAL DEFAULT UND foo
# DYNSYMS-GNU-NEXT: 2: 0000000000000000 0 NOTYPE LOCAL DEFAULT UND bar
--- !ELF
FileHeader:
Class: ELFCLASS64
Data: ELFDATA2LSB
Type: ET_DYN
Machine: EM_X86_64
Sections:
- Name: .dynamic
Type: SHT_DYNAMIC
Entries:
- Tag: DT_SYMTAB
Value: 0x100
- Tag: DT_NULL
Value: 0
- Name: .dynsym
Type: SHT_DYNSYM
Address: 0x100
DynamicSymbols:
- Name: foo
- Name: bar
ProgramHeaders:
- Type: PT_LOAD
VAddr: 0x100
Sections:
- Section: .dynsym
## Case 2: Check the two-letter alias --dt is equivalent to the --dyn-symbols
## full flag name.
# RUN: llvm-readobj --dt %t1.so > %t.readobj-dt-alias
# RUN: llvm-readobj --dyn-symbols %t1.so > %t.readobj-dt-no-alias
# RUN: cmp %t.readobj-dt-alias %t.readobj-dt-no-alias
## Case 3: Check that we are able to dump the dynamic symbol table even when we have no program headers.
## In this case we find the table by it's type (SHT_DYNSYM) and ignore the DT_SYMTAB value.
# RUN: yaml2obj --docnum=2 %s -o %t2.so
# RUN: llvm-readobj %t2.so --dyn-symbols | FileCheck %s --check-prefix=NOPHDRS-LLVM
# RUN: llvm-readelf %t2.so --dyn-symbols | FileCheck %s --check-prefix=NOPHDRS-GNU
# NOPHDRS-LLVM: Name: foo
# NOPHDRS-GNU: 1: 0000000000000000 0 NOTYPE LOCAL DEFAULT UND foo
--- !ELF
FileHeader:
Class: ELFCLASS64
Data: ELFDATA2LSB
Type: ET_DYN
Machine: EM_X86_64
Sections:
- Name: .dynamic
Type: SHT_DYNAMIC
Entries:
- Tag: DT_SYMTAB
Value: 0xffff1234
- Tag: DT_NULL
Value: 0
DynamicSymbols:
- Name: foo
## Case 4: Check we report a warning when there is no SHT_DYNSYM section and we can't map the DT_SYMTAB value
## to an address because of the absence of a corresponding PT_LOAD program header.
# RUN: yaml2obj --docnum=3 %s -o %t3.so
# RUN: llvm-readobj %t3.so --dyn-symbols 2>&1 | FileCheck %s -DFILE=%t3.so --check-prefixes=NOSHT-DYNSYM,NOSHT-DYNSYM-LLVM
# RUN: llvm-readelf %t3.so --dyn-symbols 2>&1 | FileCheck %s -DFILE=%t3.so --check-prefix=NOSHT-DYNSYM
# NOSHT-DYNSYM: warning: '[[FILE]]': Unable to parse DT_SYMTAB: virtual address is not in any segment: 0x0
# NOSHT-DYNSYM-LLVM: DynamicSymbols [
# NOSHT-DYNSYM-LLVM-NEXT: ]
--- !ELF
FileHeader:
Class: ELFCLASS64
Data: ELFDATA2LSB
Type: ET_DYN
Machine: EM_X86_64
Sections:
- Name: .dynsym
Type: SHT_PROGBITS
- Name: .dynamic
Type: SHT_DYNAMIC
Entries:
- Tag: DT_SYMTAB
Value: 0
- Tag: DT_NULL
Value: 0
DynamicSymbols:
- Name: foo
## Case 5: Check that when we can't map the value of the DT_SYMTAB tag to an address, we report a warning and
## use the information in the section header table to locate the dynamic symbol table.
# RUN: yaml2obj --docnum=4 %s -o %t4.so
# RUN: llvm-readobj %t4.so --dyn-symbols 2>&1 | FileCheck -DFILE=%t4.so %s --check-prefixes=BROKEN-DTSYMTAB,BROKEN-DTSYMTAB-LLVM
# RUN: llvm-readelf %t4.so --dyn-symbols 2>&1 | FileCheck -DFILE=%t4.so %s --check-prefixes=BROKEN-DTSYMTAB,BROKEN-DTSYMTAB-GNU
# BROKEN-DTSYMTAB: warning: '[[FILE]]': Unable to parse DT_SYMTAB: virtual address is not in any segment: 0xffff1234
# BROKEN-DTSYMTAB-LLVM: Name: foo
# BROKEN-DTSYMTAB-GNU: 1: 0000000000000000 0 NOTYPE LOCAL DEFAULT UND foo
--- !ELF
FileHeader:
Class: ELFCLASS64
Data: ELFDATA2LSB
Type: ET_DYN
Machine: EM_X86_64
Sections:
- Name: .dynamic
Type: SHT_DYNAMIC
Entries:
- Tag: DT_SYMTAB
Value: 0xffff1234
- Tag: DT_NULL
Value: 0
DynamicSymbols:
- Name: foo
ProgramHeaders:
- Type: PT_LOAD
VAddr: 0x0000
Sections:
- Section: .dynsym
## Case 6: Check that if we can get the location of the dynamic symbol table using both the DT_SYMTAB value
## and the section headers table then we prefer the former and report a warning.
# RUN: yaml2obj --docnum=5 %s -o %t5.so
# RUN: llvm-readobj %t5.so --dyn-symbols 2>&1 | FileCheck -DFILE=%t5.so %s --check-prefixes=PREFER-DTSYMTAB,PREFER-DTSYMTAB-LLVM
# RUN: llvm-readelf %t5.so --dyn-symbols 2>&1 | FileCheck -DFILE=%t5.so %s --check-prefixes=PREFER-DTSYMTAB,PREFER-DTSYMTAB-GNU
# PREFER-DTSYMTAB: warning: '[[FILE]]': SHT_DYNSYM section header and DT_SYMTAB disagree about the location of the dynamic symbol table
# PREFER-DTSYMTAB-LLVM: Name: o
# PREFER-DTSYMTAB-GNU: 1: 0000000000000000 0 NOTYPE LOCAL DEFAULT UND o
--- !ELF
FileHeader:
Class: ELFCLASS64
Data: ELFDATA2LSB
Type: ET_DYN
Machine: EM_X86_64
Sections:
- Name: .dynamic
Type: SHT_DYNAMIC
Entries:
- Tag: DT_SYMTAB
Value: 0x0
- Tag: DT_NULL
Value: 0
- Name: .dynsym
Type: SHT_DYNSYM
- Name: .mydynsym
Type: SHT_DYNSYM
## The Content describes 2 symbols: zero symbol and symbol with st_name == 3.
Content: "000000000000000000000000000000000000000000000000030000000000000000000000000000000000000000000000"
DynamicSymbols:
- Name: foo
ProgramHeaders:
- Type: PT_LOAD
VAddr: 0x0000
Sections:
- Section: .mydynsym
## Case 7: Check how we dump versioned symbols. Use both -V and --dyn-symbols
## to check that printed version is consistent.
# RUN: yaml2obj %s --docnum=6 -o %t6
# RUN: llvm-readobj -V --dyn-symbols %t6 | FileCheck %s --check-prefix=VERSIONED-LLVM
# RUN: llvm-readelf -V --dyn-symbols %t6 | FileCheck %s --check-prefix=VERSIONED-GNU
# VERSIONED-LLVM: Symbol {
# VERSIONED-LLVM: Name: foo (16)
# VERSIONED-LLVM-NEXT: Value: 0x0
# VERSIONED-LLVM-NEXT: Size: 0
# VERSIONED-LLVM-NEXT: Binding: Local (0x0)
# VERSIONED-LLVM-NEXT: Type: None (0x0)
# VERSIONED-LLVM-NEXT: Other: 0
# VERSIONED-LLVM-NEXT: Section: Undefined (0x0)
# VERSIONED-LLVM-NEXT: }
# VERSIONED-LLVM-NEXT: Symbol {
# VERSIONED-LLVM-NEXT: Name: bar@@Default (12)
# VERSIONED-LLVM-NEXT: Value: 0x0
# VERSIONED-LLVM-NEXT: Size: 0
# VERSIONED-LLVM-NEXT: Binding: Local (0x0)
# VERSIONED-LLVM-NEXT: Type: None (0x0)
# VERSIONED-LLVM-NEXT: Other: 0
# VERSIONED-LLVM-NEXT: Section: Undefined (0x0)
# VERSIONED-LLVM-NEXT: }
# VERSIONED-LLVM-NEXT: Symbol {
# VERSIONED-LLVM-NEXT: Name: zed@NonDefault (20)
# VERSIONED-LLVM-NEXT: Value: 0x0
# VERSIONED-LLVM-NEXT: Size: 0
# VERSIONED-LLVM-NEXT: Binding: Local (0x0)
# VERSIONED-LLVM-NEXT: Type: None (0x0)
# VERSIONED-LLVM-NEXT: Other: 0
# VERSIONED-LLVM-NEXT: Section: Undefined (0x0)
# VERSIONED-LLVM-NEXT: }
# VERSIONED-LLVM: VersionSymbols [
# VERSIONED-LLVM: Name: foo
# VERSIONED-LLVM: Name: bar@@Default
# VERSIONED-LLVM: Name: zed@NonDefault
# VERSIONED-GNU: Num: Value Size Type Bind Vis Ndx Name
# VERSIONED-GNU: 1: 0000000000000000 0 NOTYPE LOCAL DEFAULT UND foo
# VERSIONED-GNU-NEXT: 2: 0000000000000000 0 NOTYPE LOCAL DEFAULT UND bar@@Default
# VERSIONED-GNU-NEXT: 3: 0000000000000000 0 NOTYPE LOCAL DEFAULT UND zed@NonDefault
# VERSIONED-GNU: 000: 0 (*local*) 1 (*global*) 2 (Default) 3h(NonDefault)
--- !ELF
FileHeader:
Class: ELFCLASS64
Data: ELFDATA2LSB
Type: ET_DYN
Machine: EM_X86_64
Sections:
- Name: .gnu.version
Type: SHT_GNU_versym
Flags: [ SHF_ALLOC ]
Link: .dynsym
AddressAlign: 0x2
EntSize: 0x2
## 0x8000 is a special VERSYM_HIDDEN bit.
Entries: [ 0, 1, 2, 0x8003 ]
- Name: .gnu.version_d
Type: SHT_GNU_verdef
Flags: [ SHF_ALLOC ]
Link: .dynstr
AddressAlign: 0x4
Info: 0x2
Entries:
- Version: 1
Flags: 0
VersionNdx: 2
Hash: 0
Names:
- Default
- Version: 1
Flags: 0
VersionNdx: 3
Hash: 0
Names:
- NonDefault
DynamicSymbols:
- Name: foo
- Name: bar
- Name: zed