maxjhandsome
/
llvm-project
forked from OSchip/llvm-project
1
0
Fork 0
Code Issues Pull Requests Packages Releases Wiki Activity
llvm-project/lld/test/elf/wrap.test

280 lines
9.1 KiB
Plaintext
Raw Normal View History

[ELF] Support --wrap option Use a wrapper function for symbol. Any undefined reference to symbol will be resolved to "__wrap_symbol". Any undefined reference to "__real_symbol" will be resolved to symbol. This can be used to provide a wrapper for a system function. The wrapper function should be called "__wrap_symbol". If it wishes to call the system function, it should call "__real_symbol". Here is a trivial example: void * __wrap_malloc (size_t c) { printf ("malloc called with %zu\n", c); return __real_malloc (c); } If you link other code with this file using --wrap malloc, then all calls to "malloc" will call the function "__wrap_malloc" instead. The call to "__real_malloc" in "__wrap_malloc" will call the real "malloc" function. llvm-svn: 228906
2015-02-12 13:02:46 +08:00
# This tests the functionality of using the --wrap option.
# The test case is extracted by compiling and linking the following code.
#
#cat > main.c << \!
#int main() {
# foo();
# return 0;
#}
#!
#
#cat > wrapfoo.c << \!
#int __wrap_foo() {
# __real_foo();
# return 0;
#}
#!
#
#cat > realfoo.c << \!
#int foo() {
# return 0;
#}
#!
#
#clang main.c wrapfoo.c realfoo.c -Xlinker --wrap -Xlinker foo
#RUN: yaml2obj -format=elf -docnum 1 %s -o %t.main.o
#RUN: yaml2obj -format=elf -docnum 2 %s -o %t.wrapfoo.o
#RUN: yaml2obj -format=elf -docnum 3 %s -o %t.realfoo.o
#RUN: lld -flavor gnu -target x86_64 %t.main.o %t.wrapfoo.o %t.realfoo.o \
[ELF] Insert wrap symbols into a set. Symbols specified by --wrap was being inserted into a vector, change this to insert into a set, so that we have unique entries. llvm-svn: 228968
2015-02-13 06:37:27 +08:00
#RUN: --wrap foo --wrap foo --noinhibit-exec --output-filetype=yaml -o %t2.out
[ELF] Support --wrap option Use a wrapper function for symbol. Any undefined reference to symbol will be resolved to "__wrap_symbol". Any undefined reference to "__real_symbol" will be resolved to symbol. This can be used to provide a wrapper for a system function. The wrapper function should be called "__wrap_symbol". If it wishes to call the system function, it should call "__real_symbol". Here is a trivial example: void * __wrap_malloc (size_t c) { printf ("malloc called with %zu\n", c); return __real_malloc (c); } If you link other code with this file using --wrap malloc, then all calls to "malloc" will call the function "__wrap_malloc" instead. The call to "__real_malloc" in "__wrap_malloc" will call the real "malloc" function. llvm-svn: 228906
2015-02-12 13:02:46 +08:00
#RUN: lld -flavor gnu -target x86_64 %t.main.o %t.wrapfoo.o \
[ELF] Insert wrap symbols into a set. Symbols specified by --wrap was being inserted into a vector, change this to insert into a set, so that we have unique entries. llvm-svn: 228968
2015-02-13 06:37:27 +08:00
#RUN: --wrap foo --wrap foo --noinhibit-exec --output-filetype=yaml -o %t2.out.undef 2>&1 | \
[ELF] Support --wrap option Use a wrapper function for symbol. Any undefined reference to symbol will be resolved to "__wrap_symbol". Any undefined reference to "__real_symbol" will be resolved to symbol. This can be used to provide a wrapper for a system function. The wrapper function should be called "__wrap_symbol". If it wishes to call the system function, it should call "__real_symbol". Here is a trivial example: void * __wrap_malloc (size_t c) { printf ("malloc called with %zu\n", c); return __real_malloc (c); } If you link other code with this file using --wrap malloc, then all calls to "malloc" will call the function "__wrap_malloc" instead. The call to "__real_malloc" in "__wrap_malloc" will call the real "malloc" function. llvm-svn: 228906
2015-02-12 13:02:46 +08:00
#RUN: FileCheck %s -check-prefix=CHECKUNDEF
#CHECKWRAP: - name: main
#CHECKWRAP: references:
#CHECKWRAP: - kind: R_X86_64_PC32
#CHECKWRAP: target: __wrap_foo
#CHECKWRAP: - name: __wrap_foo
#CHECKWRAP: references:
#CHECKWRAP: - kind: R_X86_64_PC32
#CHECKWRAP: target: foo
#CHECKUNDEF: Undefined symbol: {{.*}}main.o: foo
---
FileHeader:
Class: ELFCLASS64
Data: ELFDATA2LSB
OSABI: ELFOSABI_GNU
Type: ET_REL
Machine: EM_X86_64
Sections:
- Name: .text
Type: SHT_PROGBITS
Flags: [ SHF_ALLOC, SHF_EXECINSTR ]
AddressAlign: 0x0000000000000010
Content: 5031C0E80000000031C05AC3
- Name: .rela.text
Type: SHT_RELA
Link: .symtab
AddressAlign: 0x0000000000000008
Info: .text
Relocations:
- Offset: 0x0000000000000004
Symbol: foo
Type: R_X86_64_PC32
Addend: -4
- Name: .data
Type: SHT_PROGBITS
Flags: [ SHF_WRITE, SHF_ALLOC ]
AddressAlign: 0x0000000000000004
Content: ''
- Name: .bss
Type: SHT_NOBITS
Flags: [ SHF_WRITE, SHF_ALLOC ]
AddressAlign: 0x0000000000000004
Content: ''
- Name: .comment
Type: SHT_PROGBITS
Flags: [ SHF_MERGE, SHF_STRINGS ]
AddressAlign: 0x0000000000000001
Content: 00636C616E672076657273696F6E20332E372E3020287472756E6B203232383733392920286C6C766D2F7472756E6B203232383734382900
- Name: .note.GNU-stack
Type: SHT_PROGBITS
AddressAlign: 0x0000000000000001
Content: ''
- Name: .eh_frame
Type: SHT_PROGBITS
Flags: [ SHF_ALLOC ]
AddressAlign: 0x0000000000000008
Content: 1400000000000000037A5200017810011B0C070890010000140000001C000000000000000C00000000410E1000000000
- Name: .rela.eh_frame
Type: SHT_RELA
Link: .symtab
AddressAlign: 0x0000000000000008
Info: .eh_frame
Relocations:
- Offset: 0x0000000000000020
Symbol: .text
Type: R_X86_64_PC32
Symbols:
Local:
- Name: .text
Type: STT_SECTION
Section: .text
- Name: .data
Type: STT_SECTION
Section: .data
- Name: .bss
Type: STT_SECTION
Section: .bss
- Name: .comment
Type: STT_SECTION
Section: .comment
- Name: .note.GNU-stack
Type: STT_SECTION
Section: .note.GNU-stack
- Name: .eh_frame
Type: STT_SECTION
Section: .eh_frame
Global:
- Name: main
Type: STT_FUNC
Section: .text
Size: 0x000000000000000C
- Name: foo
...
---
FileHeader:
Class: ELFCLASS64
Data: ELFDATA2LSB
OSABI: ELFOSABI_GNU
Type: ET_REL
Machine: EM_X86_64
Sections:
- Name: .text
Type: SHT_PROGBITS
Flags: [ SHF_ALLOC, SHF_EXECINSTR ]
AddressAlign: 0x0000000000000010
Content: 5031C0E80000000031C05AC3
- Name: .rela.text
Type: SHT_RELA
Link: .symtab
AddressAlign: 0x0000000000000008
Info: .text
Relocations:
- Offset: 0x0000000000000004
Symbol: __real_foo
Type: R_X86_64_PC32
Addend: -4
- Name: .data
Type: SHT_PROGBITS
Flags: [ SHF_WRITE, SHF_ALLOC ]
AddressAlign: 0x0000000000000004
Content: ''
- Name: .bss
Type: SHT_NOBITS
Flags: [ SHF_WRITE, SHF_ALLOC ]
AddressAlign: 0x0000000000000004
Content: ''
- Name: .comment
Type: SHT_PROGBITS
Flags: [ SHF_MERGE, SHF_STRINGS ]
AddressAlign: 0x0000000000000001
Content: 00636C616E672076657273696F6E20332E372E3020287472756E6B203232383733392920286C6C766D2F7472756E6B203232383734382900
- Name: .note.GNU-stack
Type: SHT_PROGBITS
AddressAlign: 0x0000000000000001
Content: ''
- Name: .eh_frame
Type: SHT_PROGBITS
Flags: [ SHF_ALLOC ]
AddressAlign: 0x0000000000000008
Content: 1400000000000000037A5200017810011B0C070890010000140000001C000000000000000C00000000410E1000000000
- Name: .rela.eh_frame
Type: SHT_RELA
Link: .symtab
AddressAlign: 0x0000000000000008
Info: .eh_frame
Relocations:
- Offset: 0x0000000000000020
Symbol: .text
Type: R_X86_64_PC32
Symbols:
Local:
- Name: .text
Type: STT_SECTION
Section: .text
- Name: .data
Type: STT_SECTION
Section: .data
- Name: .bss
Type: STT_SECTION
Section: .bss
- Name: .comment
Type: STT_SECTION
Section: .comment
- Name: .note.GNU-stack
Type: STT_SECTION
Section: .note.GNU-stack
- Name: .eh_frame
Type: STT_SECTION
Section: .eh_frame
Global:
- Name: __wrap_foo
Type: STT_FUNC
Section: .text
Size: 0x000000000000000C
- Name: __real_foo
...
---
FileHeader:
Class: ELFCLASS64
Data: ELFDATA2LSB
OSABI: ELFOSABI_GNU
Type: ET_REL
Machine: EM_X86_64
Sections:
- Name: .text
Type: SHT_PROGBITS
Flags: [ SHF_ALLOC, SHF_EXECINSTR ]
AddressAlign: 0x0000000000000010
Content: 31C0C3
- Name: .data
Type: SHT_PROGBITS
Flags: [ SHF_WRITE, SHF_ALLOC ]
AddressAlign: 0x0000000000000004
Content: ''
- Name: .bss
Type: SHT_NOBITS
Flags: [ SHF_WRITE, SHF_ALLOC ]
AddressAlign: 0x0000000000000004
Content: ''
- Name: .comment
Type: SHT_PROGBITS
Flags: [ SHF_MERGE, SHF_STRINGS ]
AddressAlign: 0x0000000000000001
Content: 00636C616E672076657273696F6E20332E372E3020287472756E6B203232383733392920286C6C766D2F7472756E6B203232383734382900
- Name: .note.GNU-stack
Type: SHT_PROGBITS
AddressAlign: 0x0000000000000001
Content: ''
- Name: .eh_frame
Type: SHT_PROGBITS
Flags: [ SHF_ALLOC ]
AddressAlign: 0x0000000000000008
Content: 1400000000000000037A5200017810011B0C070890010000140000001C00000000000000030000000000000000000000
- Name: .rela.eh_frame
Type: SHT_RELA
Link: .symtab
AddressAlign: 0x0000000000000008
Info: .eh_frame
Relocations:
- Offset: 0x0000000000000020
Symbol: .text
Type: R_X86_64_PC32
Symbols:
Local:
- Name: .text
Type: STT_SECTION
Section: .text
- Name: .data
Type: STT_SECTION
Section: .data
- Name: .bss
Type: STT_SECTION
Section: .bss
- Name: .comment
Type: STT_SECTION
Section: .comment
- Name: .note.GNU-stack
Type: STT_SECTION
Section: .note.GNU-stack
- Name: .eh_frame
Type: STT_SECTION
Section: .eh_frame
Global:
- Name: foo
Type: STT_FUNC
Section: .text
Size: 0x0000000000000003
...