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It come across to me that function like printf() have not limited the number of parameters.
But when debugging program on Solaris, I noticed it will push at most 5 parameters into stack, common register will be used if there are more than 5 parameters.
So what will happen if even common register is not enough in function like printf ? Did compiler do something for me ?
The behaviour is controlled by the ABI for the platform. If there are more parameters than fit in the registers, then they will be handled in a different way. There isn’t a simple upper limit on the number of arguments that can be passed, so the compiler and the ABI define a mechanism that works on the hardware in question. What works on SPARC does not necessarily work on, for example, Intel IA32.