| ## Check how the GNU Hash section is dumped with --gnu-hash-table. |
| |
| # RUN: yaml2obj --docnum=1 -DBITS=64 -DMACHINE=EM_X86_64 %s -o %t.x64 |
| # RUN: yaml2obj --docnum=1 -DBITS=32 -DMACHINE=EM_386 %s -o %t.x32 |
| |
| # RUN: llvm-readobj --gnu-hash-table %t.x64 | FileCheck %s |
| # RUN: llvm-readelf --gnu-hash-table %t.x64 | FileCheck %s |
| |
| # RUN: llvm-readobj --gnu-hash-table %t.x32 | FileCheck %s |
| # RUN: llvm-readelf --gnu-hash-table %t.x32 | FileCheck %s |
| |
| # CHECK: GnuHashTable { |
| # CHECK-NEXT: Num Buckets: 3 |
| # CHECK-NEXT: First Hashed Symbol Index: 1 |
| # CHECK-NEXT: Num Mask Words: 2 |
| # CHECK-NEXT: Shift Count: 2 |
| # CHECK-NEXT: Bloom Filter: [0x3, 0x4] |
| # CHECK-NEXT: Buckets: [5, 6, 7] |
| # CHECK-NEXT: Values: [0x8, 0x9, 0xA, 0xB] |
| # CHECK-NEXT: } |
| |
| --- !ELF |
| FileHeader: |
| Class: ELFCLASS[[BITS]] |
| Data: ELFDATA2LSB |
| Type: ET_DYN |
| Machine: [[MACHINE]] |
| Sections: |
| - Name: .gnu.hash |
| Type: SHT_GNU_HASH |
| Flags: [ SHF_ALLOC ] |
| Header: |
| SymNdx: 0x1 |
| Shift2: 0x2 |
| ## The number of words in the Bloom filter. The value of 2 is no-op. |
| MaskWords: [[MASKWORDS=2]] |
| ## The number of hash buckets. The value of 3 is no-op. |
| NBuckets: [[NBUCKETS=3]] |
| BloomFilter: [0x3, 0x4] |
| HashBuckets: [0x5, 0x6, 0x7] |
| HashValues: [0x8, 0x9, 0xA, 0xB] |
| - Name: .dynamic |
| Type: SHT_DYNAMIC |
| Flags: [ SHF_ALLOC ] |
| Link: .dynstr |
| Entries: |
| - Tag: DT_GNU_HASH |
| Value: 0x0 |
| - Tag: DT_NULL |
| Value: 0x0 |
| DynamicSymbols: |
| - Name: aaa |
| Binding: STB_GLOBAL |
| - Name: bbb |
| Binding: STB_GLOBAL |
| - Name: ccc |
| Binding: STB_GLOBAL |
| - Name: ddd |
| Binding: STB_GLOBAL |
| ProgramHeaders: |
| - Type: PT_LOAD |
| Flags: [ PF_R, PF_X ] |
| Sections: |
| - Section: .gnu.hash |
| - Section: .dynamic |
| |
| ## Check we report a warning if there is no dynamic symbol section in the object. |
| |
| # RUN: yaml2obj --docnum=2 %s -o %t.nodynsym |
| # RUN: llvm-readobj --gnu-hash-table %t.nodynsym 2>&1 | FileCheck %s -DFILE=%t.nodynsym --check-prefix=NODYNSYM |
| # RUN: llvm-readelf --gnu-hash-table %t.nodynsym 2>&1 | FileCheck %s -DFILE=%t.nodynsym --check-prefix=NODYNSYM |
| |
| # NODYNSYM: GnuHashTable { |
| # NODYNSYM-NEXT: Num Buckets: 1 |
| # NODYNSYM-NEXT: First Hashed Symbol Index: 0 |
| # NODYNSYM-NEXT: Num Mask Words: 1 |
| # NODYNSYM-NEXT: Shift Count: 0 |
| # NODYNSYM-NEXT: Bloom Filter: [0x0] |
| # NODYNSYM-NEXT: Buckets: [0] |
| # NODYNSYM-NEXT: warning: '[[FILE]]': unable to dump 'Values' for the SHT_GNU_HASH section: no dynamic symbol table found |
| # NODYNSYM-NEXT: } |
| |
| --- !ELF |
| FileHeader: |
| Class: ELFCLASS64 |
| Data: ELFDATA2LSB |
| Type: ET_DYN |
| Machine: EM_X86_64 |
| Sections: |
| - Name: .gnu.hash |
| Type: SHT_GNU_HASH |
| Flags: [ SHF_ALLOC ] |
| Header: |
| SymNdx: 0x0 |
| Shift2: 0x0 |
| BloomFilter: [ 0x0 ] |
| HashBuckets: [ 0x0 ] |
| HashValues: [ 0x0 ] |
| - Name: .dynamic |
| Type: SHT_DYNAMIC |
| Flags: [ SHF_ALLOC ] |
| Entries: |
| - Tag: DT_GNU_HASH |
| Value: 0x0 |
| - Tag: DT_NULL |
| Value: 0x0 |
| ProgramHeaders: |
| - Type: PT_LOAD |
| Flags: [ PF_R, PF_X ] |
| Sections: |
| - Section: .gnu.hash |
| - Section: .dynamic |
| |
| ## Check what we do when the index of the first symbol in the dynamic symbol table |
| ## included in the hash table is larger than the number of dynamic symbols. |
| |
| # RUN: yaml2obj --docnum=3 %s -o %t.brokensymndx |
| # RUN: llvm-readobj --gnu-hash-table %t.brokensymndx 2>&1 \ |
| # RUN: | FileCheck %s -DFILE=%t.brokensymndx --check-prefix=SYMNDX |
| # RUN: llvm-readelf --gnu-hash-table %t.brokensymndx 2>&1 \ |
| # RUN: | FileCheck %s -DFILE=%t.brokensymndx --check-prefix=SYMNDX |
| |
| # SYMNDX: GnuHashTable { |
| # SYMNDX-NEXT: Num Buckets: 1 |
| # SYMNDX-NEXT: First Hashed Symbol Index: 2 |
| # SYMNDX-NEXT: Num Mask Words: 1 |
| # SYMNDX-NEXT: Shift Count: 0 |
| # SYMNDX-NEXT: Bloom Filter: [0x1] |
| # SYMNDX-NEXT: Buckets: [2] |
| # SYMNDX-NEXT: warning: '[[FILE]]': unable to dump 'Values' for the SHT_GNU_HASH section: the first hashed symbol index (2) is larger than the number of dynamic symbols (2) |
| # SYMNDX-NEXT: } |
| |
| --- !ELF |
| FileHeader: |
| Class: ELFCLASS64 |
| Data: ELFDATA2LSB |
| Type: ET_DYN |
| Machine: EM_X86_64 |
| Sections: |
| - Name: .gnu.hash |
| Type: SHT_GNU_HASH |
| Flags: [ SHF_ALLOC ] |
| Header: |
| SymNdx: 0x2 |
| Shift2: 0x0 |
| BloomFilter: [ 0x1 ] |
| HashBuckets: [ 0x2 ] |
| HashValues: [ 0x3 ] |
| - Name: .dynamic |
| Type: SHT_DYNAMIC |
| Flags: [ SHF_ALLOC ] |
| Link: 0 |
| Entries: |
| - Tag: DT_GNU_HASH |
| Value: 0x0 |
| - Tag: DT_NULL |
| Value: 0x0 |
| DynamicSymbols: |
| - Name: aaa |
| Binding: STB_GLOBAL |
| ProgramHeaders: |
| - Type: PT_LOAD |
| Flags: [ PF_R, PF_X ] |
| Sections: |
| - Section: .gnu.hash |
| - Section: .dynamic |
| |
| ## Check we emit a warning when the dynamic symbol table is empty. |
| ## A valid dynamic symbol table should have at least one symbol: the symbol with index 0. |
| |
| # RUN: yaml2obj --docnum=4 %s -o %t.emptydynsym |
| # RUN: llvm-readobj --gnu-hash-table %t.emptydynsym 2>&1 \ |
| # RUN: | FileCheck %s -DFILE=%t.emptydynsym --check-prefix=EMPTY-DYNSYM |
| # RUN: llvm-readelf --gnu-hash-table %t.emptydynsym 2>&1 \ |
| # RUN: | FileCheck %s -DFILE=%t.emptydynsym --check-prefix=EMPTY-DYNSYM |
| |
| # EMPTY-DYNSYM: GnuHashTable { |
| # EMPTY-DYNSYM-NEXT: Num Buckets: 1 |
| # EMPTY-DYNSYM-NEXT: First Hashed Symbol Index: 0 |
| # EMPTY-DYNSYM-NEXT: Num Mask Words: 1 |
| # EMPTY-DYNSYM-NEXT: Shift Count: 0 |
| # EMPTY-DYNSYM-NEXT: Bloom Filter: [0x0] |
| # EMPTY-DYNSYM-NEXT: Buckets: [0] |
| # EMPTY-DYNSYM-NEXT: warning: '[[FILE]]': unable to dump 'Values' for the SHT_GNU_HASH section: the dynamic symbol table is empty |
| # EMPTY-DYNSYM-NEXT: } |
| |
| --- !ELF |
| FileHeader: |
| Class: ELFCLASS64 |
| Data: ELFDATA2LSB |
| Type: ET_DYN |
| Machine: EM_X86_64 |
| Sections: |
| - Name: .gnu.hash |
| Type: SHT_GNU_HASH |
| Flags: [ SHF_ALLOC ] |
| Header: |
| SymNdx: 0x0 |
| Shift2: 0x0 |
| BloomFilter: [ 0x0 ] |
| HashBuckets: [ 0x0 ] |
| HashValues: [ 0x0 ] |
| - Name: .dynamic |
| Type: SHT_DYNAMIC |
| Flags: [ SHF_ALLOC ] |
| Link: 0 |
| Entries: |
| - Tag: DT_GNU_HASH |
| Value: 0x0 |
| - Tag: DT_NULL |
| Value: 0x0 |
| - Name: .dynsym |
| Type: SHT_DYNSYM |
| Size: 0 |
| ProgramHeaders: |
| - Type: PT_LOAD |
| Flags: [ PF_R, PF_X ] |
| Sections: |
| - Section: .gnu.hash |
| - Section: .dynamic |
| |
| ## Linkers might produce an empty no-op SHT_GNU_HASH section when |
| ## there are no dynamic symbols or when all dynamic symbols are undefined. |
| ## Such sections normally have a single zero entry in the bloom |
| ## filter, a single zero entry in the hash bucket and no values. |
| ## |
| ## The index of the first symbol in the dynamic symbol table |
| ## included in the hash table can be set to the number of dynamic symbols, |
| ## which is one larger than the index of the last dynamic symbol. |
| ## For empty tables however, this value is unimportant and can be ignored. |
| |
| ## Case A: set the index of the first symbol in the dynamic symbol table to |
| ## the number of dynamic symbols. |
| # RUN: yaml2obj --docnum=5 -DSYMNDX=0x1 %s -o %t.empty.1 |
| # RUN: llvm-readobj --gnu-hash-table %t.empty.1 2>&1 \ |
| # RUN: | FileCheck %s -DFILE=%t.empty.1 -DSYMNDX=1 --check-prefix=EMPTY --implicit-check-not="warning:" |
| # RUN: llvm-readelf --gnu-hash-table %t.empty.1 2>&1 \ |
| # RUN: | FileCheck %s -DFILE=%t.empty.1 -DSYMNDX=1 --check-prefix=EMPTY --implicit-check-not="warning:" |
| |
| ## Case B: set the index of the first symbol in the dynamic symbol table to |
| ## an arbitrary value that is larger than the number of dynamic symbols. |
| # RUN: yaml2obj --docnum=5 -DSYMNDX=0x2 %s -o %t.empty.2 |
| # RUN: llvm-readobj --gnu-hash-table %t.empty.2 2>&1 \ |
| # RUN: | FileCheck %s -DFILE=%t.empty.2 -DSYMNDX=2 --check-prefix=EMPTY --implicit-check-not="warning:" |
| # RUN: llvm-readelf --gnu-hash-table %t.empty.2 2>&1 \ |
| # RUN: | FileCheck %s -DFILE=%t.empty.2 -DSYMNDX=2 --check-prefix=EMPTY --implicit-check-not="warning:" |
| |
| # EMPTY: GnuHashTable { |
| # EMPTY-NEXT: Num Buckets: 1 |
| # EMPTY-NEXT: First Hashed Symbol Index: [[SYMNDX]] |
| # EMPTY-NEXT: Num Mask Words: 1 |
| # EMPTY-NEXT: Shift Count: 0 |
| # EMPTY-NEXT: Bloom Filter: [0x0] |
| # EMPTY-NEXT: Buckets: [0] |
| # EMPTY-NEXT: Values: [] |
| # EMPTY-NEXT: } |
| |
| --- !ELF |
| FileHeader: |
| Class: ELFCLASS64 |
| Data: ELFDATA2LSB |
| Type: ET_DYN |
| Machine: EM_X86_64 |
| Sections: |
| - Name: .gnu.hash |
| Type: SHT_GNU_HASH |
| Flags: [ SHF_ALLOC ] |
| Header: |
| SymNdx: [[SYMNDX]] |
| Shift2: 0x0 |
| BloomFilter: [ 0x0 ] |
| HashBuckets: [ 0x0 ] |
| HashValues: [ ] |
| - Name: .dynamic |
| Type: SHT_DYNAMIC |
| Flags: [ SHF_ALLOC ] |
| Link: 0 |
| Entries: |
| - Tag: DT_GNU_HASH |
| Value: 0x0 |
| - Tag: DT_NULL |
| Value: 0x0 |
| DynamicSymbols: [] |
| ProgramHeaders: |
| - Type: PT_LOAD |
| Flags: [ PF_R, PF_X ] |
| Sections: |
| - Section: .gnu.hash |
| - Section: .dynamic |
| |
| ## Check we report a proper warning when a hash table goes past the end of the file. |
| |
| ## Case A: the 'maskwords' field is set so that the table goes past the end of the file. |
| # RUN: yaml2obj --docnum=1 -DBITS=64 -DMACHINE=EM_X86_64 -D MASKWORDS=4294967295 %s -o %t.err.maskwords |
| # RUN: llvm-readobj --gnu-hash-table %t.err.maskwords 2>&1 | \ |
| # RUN: FileCheck %s -DFILE=%t.err.maskwords -DMASKWORDS=4294967295 -DNBUCKETS=3 --check-prefix=ERR |
| # RUN: llvm-readelf --gnu-hash-table %t.err.maskwords 2>&1 | \ |
| # RUN: FileCheck %s -DFILE=%t.err.maskwords -DMASKWORDS=4294967295 -DNBUCKETS=3 --check-prefix=ERR |
| |
| ## Case B: the 'nbuckets' field is set so that the table goes past the end of the file. |
| # RUN: yaml2obj --docnum=1 -DBITS=64 -DMACHINE=EM_X86_64 -D NBUCKETS=4294967295 %s -o %t.err.nbuckets |
| # RUN: llvm-readobj --gnu-hash-table %t.err.nbuckets 2>&1 | \ |
| # RUN: FileCheck %s -DFILE=%t.err.nbuckets -DMASKWORDS=2 -DNBUCKETS=4294967295 --check-prefix=ERR |
| # RUN: llvm-readelf --gnu-hash-table %t.err.nbuckets 2>&1 | \ |
| # RUN: FileCheck %s -DFILE=%t.err.nbuckets -DMASKWORDS=2 -DNBUCKETS=4294967295 --check-prefix=ERR |
| |
| # ERR: GnuHashTable { |
| # ERR-NEXT: Num Buckets: [[NBUCKETS]] |
| # ERR-NEXT: First Hashed Symbol Index: 1 |
| # ERR-NEXT: Num Mask Words: [[MASKWORDS]] |
| # ERR-NEXT: Shift Count: 2 |
| # ERR-NEXT: warning: '[[FILE]]': unable to dump the SHT_GNU_HASH section at 0x78: it goes past the end of the file |
| # ERR-NEXT: } |
| |
| ## Check we report a single warning about the broken GNU hash table when both |
| ## --gnu-hash-table and --elf-hash-histogram options are requested. |
| # RUN: llvm-readelf --gnu-hash-table --elf-hash-histogram %t.err.nbuckets 2>&1 | \ |
| # RUN: FileCheck %s -DFILE=%t.err.nbuckets -DMASKWORDS=2 -DNBUCKETS=4294967295 --check-prefix=ERR --implicit-check-not=warning |
