CODEWITHSUNDEEP
linuxlinux-kernel
jianxi sun
jianxi sun

Reputation: 350

function with the same name in kernel

Which function will be called ？

cscope：

[1] include/linux/sched.h 
Cscope tag: show_regs

1    108  /data/linux-3.4.7/arch/x86/kernel/process.c <<show_regs>>
         void show_regs(struct pt_regs *regs)
2     14  /data/linux-3.4.7/arch/x86/um/sysrq_32.c <<show_regs>>
         void show_regs(struct pt_regs *regs)
3     37  /data/linux-3.4.7/arch/x86/um/sysrq_64.c <<show_regs>>
         void show_regs(struct pt_regs *regs)

And how gcc know which function will be linked？

Upvotes: 0

Views: 425

Answers (1)

gsb
gsb

Reputation: 41

Within a shared library, a call to a function that is a global symbol costs a “call” instruction to a code location in the so-called PLT (procedure linkage table) which contains a “jump” instruction to the actual function's code.

when the language allows different entities to be named with the same identifier as long as they occupy a different namespace (where a namespace is typically defined by a module, class, or explicit namespace directive) collisions are resolved through the concept of name mangling.

Name mangling provides a way of encoding additional information in the name of a function, structure, class or another datatype in order to pass more semantic information from the compilers to linkers.

SRC : Wiki , gnu.org

Upvotes: 1

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