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Re: gdb and g77
- To: egcs at egcs dot cygnus dot com
- Subject: Re: gdb and g77
- From: Per Bothner <bothner at pacbell dot net>
- Date: 14 Jun 1999 11:57:56 -0700
- References: <31110.929382664@upchuck.cygnus.com>
Jeffrey A Law <law@cygnus.com> writes:
The way it *should* work IMNSHO:
* A f77 3*2 array should be represented internally (tree nodes etc)
the same as a C 2*3 array: I.e. a 2-element array of 3-element arrays.
* The stabs should be the same for a f77 3*2 array as for a C 2*3 array.
* The internal Gdb representation of a f77 3*2 array should be the
asme as a C 2*3 array.
* When Gdb evaluates the f77 experession A(i,j) it should do the same
thing as when evaluating the C expression A[j][i]. This re-arranging
can be done by the expression parsing, or (by using a different
expression opcode) in the expression evaluator. Because the parser
cannot distinguish a function call from an array indexing operation,
it does the latter, using the opcode OP_F77_UNDETERMINED_ARGLIST.
Rationale: Logically, a f77 3*2 array is equivalent to a C 2*3 array
- it is just the order of indexes that are different. The difference is
not one of types, but of expression syntax. Hence the types should
be represented the same.
I worked on this some years ago, trying to clean up some code from
Motorola, but it has been a while, and may well have bit-rotten
- or been wrong in the first place.
--
--Per Bothner
bothner@pacbell.net http://home.pacbell.net/bothner/