Pascal Development System Internal Documentation Jan82

CONFIDENTIAL PASCAL DEVELOPMENT SYSTEM INTERNAL DOCUMENTATION Bill Schottstaedt Ext 2379 26-Jan-82 CONTENTS: ICode Definition Compiler Packing Information Translation from Apple to Lisa Pascal Monitor-Apple II Interface MPasL:ib Routines Linker File Layout Intrinsic Unit Trap Handler The Old Jump Table Format 26-Jan-82 Bill Schottstaedt Conf i de nt ial 26~Jan-82 Page 1 Bill Schottstaedt Ccmf i dent ial Page 2 ICODE DEFINITION TIle first pass of the compiler generates a .I file. Its contents are: 00 Variable references: 01 +offset 02 +offset 03 lev +offset 04 com +Offset 05 reg size expr 05 reg 0 06 11?1111 07 1111111 08-0B nnnnnnn Global variable reference Local variable reference Intermediate level variable reference Common variable reference Register reference String temp Set temp 1/2/4/8 byte temp Addressing operators: OC addr ••• OD addr ••• OE addr ••• OF +offset addr ••• 10-13 nnnnnnn addr ••• expr ••• 14 nnnnnnn nnnnnnn addr ••• expr ••• 15 +on nnnnnnn addr ••• expr ••• 16 addr ••• 'A' _ Dereference operator 'A' _ File dereference operator , A' _ Text file dereference operator '.' - Record field offset '[]' - 1/2/4/8 byte array index '[]' - Long array index '[]' - Packed array access '@' - Address of operator Cons tants: 17 18-1 B 111111111111/1 Ie nnn ' ABC ••• ' 1D nnn 'ABC ••• ' IE nnn [1,5 •• 7,21] IF nil 1/2/4/8 byte constant String constant PAOC Constant Set constant [1 - Null set Assignment: operators: 20-23 flippable addr ••• expr ••• ':-' - 1/2/4/8 byte assignment (* flippable is true if the assignment left hand side can be computed after the right hand side. In this case, we have expr ••• addr ••• *) 24 nnnnnnn ad dr. •• expr ••• 25 nnn addr ••• expr ••• 26 (15/3E/3F ••• ) expr ••• 27 nnn addr... expr ••• 28 nnn nnn addr... expr ••• 29 nnn addr... expr ••• 2A nnn addr ••• expr ••• 26'-Jan-82 ':-' - Multiple byte assignment ':-' - Set assignment ':-' - Packed assignment ':-' - String assignment ':-' - PAOC Assignment , :-+' - Add to ':--' - Subtract from Bill Schottstaedt Page 3 Confidential 2B nnn 2C lev isptr addr ••• 2D lev 2E 10----- hi----- expr ••• 2F hi- expr ••• WITH field reference, level nnn Begin WITH statement, level nnn End WITH statement, level nnn 2 Byte Range Check String Range Check - assignment, not index Data Conversion: 30-32 expr ••• 33-35 expr ••• 36-37 expr ••• 38-39 expr ••• 3A-3B expr ••• 3C-3D expr ••• 3E fff expr ••• 3F fff expr ••• 1->2,2->4,1->4 integer 2->1,4->2,4->1 integer 4->8,8->4 real conversion 4->4,4->8 Float 4->4,8->4 Trunc 4->4,8->4 Round Extract unsigned field Extract signed field Scalar operators: 40-41 expr ••• expr ••• 42-43 expr ••• expr ••• 44-45 expr ••• expr ••• 46-47 expr ••• expr ••• 48-49 expr ••• expr ••• 4A-4B expr ••• 4C-4D expr ••• 4E-4F expr ••• 50-52 exp"r. •• expr ••• 53-55 expr ••• expr ••• 56-58 expr ••• expr ••• 59-5B expr ••• 5C-5E expr ••• expr ••• 5F-61 expr ••• expr ••• 62-64 expr ••• expr ••• 65-67 expr ••• expr ••• 68-6A expr…