Gpc January 2021

gpc@gnu.de

4 participants
2 discussions

ISO7185 compliance
by Paul Isaacs 22 Jan '21

22 Jan '21

Thanks to everyone who responded. I am trying to write a compliant 7185 compiler from 7185 compliant source. The problem arose because my compiler produced an error on the construct described when it compiled itself. I think that ( b )^.Field1 is a compliant work around because the expression will be treated as a variable access. I am using the 7185 spec rather than 10206 because it is much smaller and within a single person's scope. Also the compiler is intended for embedded systems where there is less need for advanced features. UsingÂ the 7185 spec as a base grammar will allow for grammar additions, such a interrupt directives, to be added to a well specified grammar as small tweaks. As well, 7185 is specified as a single source file so there is no need for a link editor to stitch together various pieces of object code to produce an executable. Without need for a linker, the complier becomes much more portable. There are many more embedded CPU chips than larger scale CPUs with operating systems. Regards, Paul Isaacs

2 1

ISO7185 compliance
by Paul Isaacs 22 Jan '21

22 Jan '21

Hello: gpc --classic-pascal compiles the following without error: procedure test; type Â xHandleÂ Â Â Â Â Â Â Â Â Â Â Â = ^xRecord; Â xRecordÂ Â Â Â Â Â Â Â Â Â Â Â = record Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â field1Â Â : integer; Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â end; var Â aÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â : integer; Â function bÂ Â Â Â Â Â Â Â Â : xHandle; Â var Â cÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â : xHandle; Â begin Â bÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â := c; Â end; begin Â aÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â := b^.field1; end; Is this 7185 compliant? The right hand side of the assignment is a 6.7.3 function-designator rule : Â Â Â Â Â function-designator = function-identifier [ actual-parameter-list ] . followed by "^." I can not see how the grammar permits the following pointer and record accesses. Thank you, Paul Isaacs

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Gpc January 2021