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llvm-project/lld/test/elf/wrap.test

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[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
---
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...
---
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---
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...