`this' pointer vs. return pointer

[mendell at ca.ibm.com]

I believe that the latest C ABI passes the pointer to the struct return 
value in r8, so this isn't a problem.

Mark Mendell


Please respond to Mark Mitchell <mark at codesourcery.com> 
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Subject:        `this' pointer vs. return pointer



Does anyone remember what the resolution was on wehther the `this'
pointer comes before, or after, the pointer to structures returned by
value?

I don't think the document actually *says* at present.

I think the buffer pointer should come first, and the `this' pointer
should come afterwards.

This makes sense because then the rule is:

  - As a result of this language being C++, you add a `this' pointer.

  - In your back-end, you notice that you've got a return by value,
    so you add another parameter.

Doing anything else is going to be next to impossible in GCC, I
suspect.

Thoughts?

--
Mark Mitchell                   mark at codesourcery.com
CodeSourcery, LLC               http://www.codesourcery.com


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