Arun Sharma wrote:
On Jan 8, 2008 6:59 AM, Andrew Cagney <[EMAIL PROTECTED]
<mailto:[EMAIL PROTECTED]>> wrote:
1.98c worth:
- the "CFA" value is from the frame inner to cursor
can I suggest a name like UNW_REG_INNER_CFA?
Is there an ambiguity that the longer name helps resolve?
Consider:
foo() -- inner
bar()
main() - outer
and:
bar_cursor = foo_cursor
step(&bar_cursor)
so that bar's inner is foo; then foo's CFA can only be obtained by:
bar_cursor.get(UNW_REG_INNER_CFA)
and not:
foo_cursor.get(UNW_REG_CFA)
This is because foo's CFA is only computed when stepping the cursor to
bar (and the computed value is saved in bar).
Andrew
- can it be assigned a negative constant value so that it can't polute
the ISA register number space
when extending the x86 register numbers I had to leave a gap in the
middle to ensure "binary" number compatibility, giving these libunwind
"registers" constant -ve values would help avoid that in the future
This sounds like a good thing to do.
But because we have other libunwind registers (eg: UNW_TDEP_IP) whose
values change when new ISA registers are added, this should be a
separate patch.
-Arun
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