[Top][All Lists]

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [Lightning] Code patching, context switching

From: Paolo Bonzini
Subject: Re: [Lightning] Code patching, context switching
Date: Thu, 21 Feb 2008 09:34:19 +0100
User-agent: Thunderbird (Macintosh/20071031)

For instance,
on every pusharg, increment the last allocated register by one, then
wrap once you reach JIT_R_NUM, and push JIT_R(0) on the stack.

Are we talking about the same pusharg? :-)

can even accept an additional parameter as a hint (like C's 'register'
storage class), to help it determine whether to allocate it to a
register, or push it on the stack.

Whether an argument goes in a register or on the stack is mandated by the ABI.

The low-level API then exposes the full register set for those who
actually want to generate their own code.

There is already a kind of low-level ABI. What I could do would be to provide a JIT_ALL_REGS_NUM macro, a jit_all_regs[] array, and three macros (e.g. JIT_IS_REG_CALLER_SAVE, JIT_IS_REG_CALLEE_SAVE, JIT_IS_REG_RESERVED) to tell you whether a register is caller save, callee save or reserved for use by lightning macros. I'd prefer if you wrote the patch though. :-)


reply via email to

[Prev in Thread] Current Thread [Next in Thread]