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nasm/test/elf_visibility.asm

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NASM
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elf: support weak global and extern references A global or extern definition can now contain the keyword "weak" (or "strong", although that is the default) to create a weak symbol or a weak external reference, respectively. Signed-off-by: H. Peter Anvin (Intel) <hpa@zytor.com>
2019-09-12 18:27:50 +00:00
global foo:(foo_end - foo)
test: test for ELF symbol visibility Add test for declaring ELF visibility. Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
2018-06-18 18:37:17 +00:00
global foo_hidden:function hidden
elf: support weak global and extern references A global or extern definition can now contain the keyword "weak" (or "strong", although that is the default) to create a weak symbol or a weak external reference, respectively. Signed-off-by: H. Peter Anvin (Intel) <hpa@zytor.com>
2019-09-12 18:27:50 +00:00
global foo_protected:function protected
global foo_internal:function internal
global foo_weak:function weak
global foo_hidden_weak:function hidden weak
Drop unnecessary EXTERN symbols Currently, NASM always issues as an unknown symbol any symbol declared EXTERN. This is highly undesirable when using common header files, as it might cause the linker to pull in a bunch of unnecessary modules, depending on how smart the linker is. Add a new REQUIRED directive which behaves like the old EXTERN, for the use cases which might still need this behavior. Signed-off-by: H. Peter Anvin (Intel) <hpa@zytor.com>
2019-09-13 00:21:03 +00:00
extern strong_ref, weak_ref:weak, unused_ref
elf: fix "object" symbol keyword The "object" symbol keyword would incorrectly generate STT_NOTYPE instead of STT_OBJECT. Add test for weak object references; they are different from plain weak references in that they are guaranteed to resolve to zero if the symbol is not found. Signed-off-by: H. Peter Anvin (Intel) <hpa@zytor.com>
2019-09-13 00:45:11 +00:00
extern weak_object_ref:weak object
Drop unnecessary EXTERN symbols Currently, NASM always issues as an unknown symbol any symbol declared EXTERN. This is highly undesirable when using common header files, as it might cause the linker to pull in a bunch of unnecessary modules, depending on how smart the linker is. Add a new REQUIRED directive which behaves like the old EXTERN, for the use cases which might still need this behavior. Signed-off-by: H. Peter Anvin (Intel) <hpa@zytor.com>
2019-09-13 00:21:03 +00:00
required required_ref
test: test for ELF symbol visibility Add test for declaring ELF visibility. Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
2018-06-18 18:37:17 +00:00
SECTION .text align=16
foo:
elf: support weak global and extern references A global or extern definition can now contain the keyword "weak" (or "strong", although that is the default) to create a weak symbol or a weak external reference, respectively. Signed-off-by: H. Peter Anvin (Intel) <hpa@zytor.com>
2019-09-12 18:27:50 +00:00
nop
test: test for ELF symbol visibility Add test for declaring ELF visibility. Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
2018-06-18 18:37:17 +00:00
foo_hidden:
elf: support weak global and extern references A global or extern definition can now contain the keyword "weak" (or "strong", although that is the default) to create a weak symbol or a weak external reference, respectively. Signed-off-by: H. Peter Anvin (Intel) <hpa@zytor.com>
2019-09-12 18:27:50 +00:00
nop
foo_protected:
nop
foo_internal:
nop
foo_weak:
ret
foo_hidden_weak:
mov eax,weak_ref
mov eax,strong_ref
elf: fix "object" symbol keyword The "object" symbol keyword would incorrectly generate STT_NOTYPE instead of STT_OBJECT. Add test for weak object references; they are different from plain weak references in that they are guaranteed to resolve to zero if the symbol is not found. Signed-off-by: H. Peter Anvin (Intel) <hpa@zytor.com>
2019-09-13 00:45:11 +00:00
mov eax,weak_object_ref
test: test for ELF symbol visibility Add test for declaring ELF visibility. Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
2018-06-18 18:37:17 +00:00
foo_label:
elf: support weak global and extern references A global or extern definition can now contain the keyword "weak" (or "strong", although that is the default) to create a weak symbol or a weak external reference, respectively. Signed-off-by: H. Peter Anvin (Intel) <hpa@zytor.com>
2019-09-12 18:27:50 +00:00
ret
foo_end:
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