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|
## Here we test the --elf-hash-histogram command line option.
## This test case checks how we built a histogram for a GNU hash section.
## We check both 32-bit and 64-bit inputs.
# RUN: yaml2obj --docnum=1 %s -o %t1-32.o
# RUN: llvm-readelf --elf-hash-histogram %t1-32.o | FileCheck %s --check-prefix=GNU-HASH
# RUN: yaml2obj --docnum=2 %s -o %t1-64.o
# RUN: llvm-readelf --elf-hash-histogram %t1-64.o | FileCheck %s --check-prefix=GNU-HASH
# GNU-HASH: Histogram for `.gnu.hash' bucket list length (total of 3 buckets)
# GNU-HASH-NEXT: Length Number % of total Coverage
# GNU-HASH-NEXT: 0 1 ( 33.3%) 0.0%
# GNU-HASH-NEXT: 1 1 ( 33.3%) 25.0%
# GNU-HASH-NEXT: 2 0 ( 0.0%) 25.0%
# GNU-HASH-NEXT: 3 1 ( 33.3%) 100.0%
--- !ELF
FileHeader:
Class: ELFCLASS32
Data: ELFDATA2LSB
Type: ET_DYN
Machine: EM_386
Sections:
- Name: .gnu.hash
Type: SHT_GNU_HASH
Flags: [ SHF_ALLOC ]
Header:
SymNdx: 0x1
Shift2: 0x0
BloomFilter: [ 0x0 ]
HashBuckets: [ 0x00000001, 0x00000004, 0x00000000 ]
HashValues: [ 0x0B887388, 0xECD54542, 0x7C92E3BB, 0x1C5871D9 ]
- Name: .dynamic
Type: SHT_DYNAMIC
Flags: [ SHF_WRITE, SHF_ALLOC ]
Entries:
- Tag: DT_GNU_HASH
Value: 0x0
- Tag: DT_NULL
Value: 0x0
DynamicSymbols:
- Name: a
- Name: b
- Name: c
- Name: d
ProgramHeaders:
- Type: PT_LOAD
Sections:
- Section: .gnu.hash
- Section: .dynamic
--- !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: 0x1
Shift2: 0x0
BloomFilter: [ 0x0 ]
HashBuckets: [ 0x00000001, 0x00000004, 0x00000000 ]
HashValues: [ 0x0B887388, 0xECD54542, 0x7C92E3BB, 0x1C5871D9 ]
- Name: .dynamic
Type: SHT_DYNAMIC
Flags: [ SHF_WRITE, SHF_ALLOC ]
Entries:
- Tag: DT_GNU_HASH
Value: 0x0
- Tag: DT_NULL
Value: 0x0
DynamicSymbols:
- Name: a
- Name: b
- Name: c
- Name: d
ProgramHeaders:
- Type: PT_LOAD
Sections:
- Section: .gnu.hash
- Section: .dynamic
## Show that we report a warning for a hash table which contains an entry of
## the bucket array pointing to a cycle.
# RUN: yaml2obj --docnum=3 %s -o %t2.o
# RUN: llvm-readelf --elf-hash-histogram 2>&1 %t2.o | FileCheck -DFILE=%t2.o %s --check-prefix=BROKEN
# BROKEN: warning: '[[FILE]]': .hash section is invalid: bucket 1: a cycle was detected in the linked chain
# BROKEN: Histogram for bucket list length (total of 1 buckets)
# BROKEN-NEXT: Length Number % of total Coverage
# BROKEN-NEXT: 0 0 ( 0.0%) 0.0%
# BROKEN-NEXT: 1 1 (100.0%) 100.0%
--- !ELF
FileHeader:
Class: ELFCLASS32
Data: ELFDATA2LSB
Type: ET_REL
Machine: EM_386
Sections:
- Name: .hash
Type: SHT_HASH
Link: .dynsym
Bucket: [ 1 ]
Chain: [ 0, 1 ]
- Name: .dynamic
Type: SHT_DYNAMIC
Flags: [ SHF_ALLOC ]
Entries:
## llvm-readelf will read the hash table from the file offset
## p_offset + (p_vaddr - DT_HASH) = p_offset + (0 - 0) = p_offset,
## which is the start of PT_LOAD, i.e. the file offset of .hash.
- Tag: DT_HASH
Value: 0x0
- Tag: DT_NULL
Value: 0
DynamicSymbols:
- Name: foo
ProgramHeaders:
- Type: PT_LOAD
Sections:
- Section: .hash
- Section: .dynamic
|
