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148 lines
4.0 KiB
C
148 lines
4.0 KiB
C
/*
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slinkyExpressions.h -- Expression definitions for the Slinky linker
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Chip Morningstar -- Lucasfilm Ltd.
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6-November-1985
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*/
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/*
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Expressions are stored in the object file in a compact parse-tree
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representation. We just read this directly and interpret it on-the-fly
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without much sophistication. Function definitions include whole
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statements, but the principle is the same.
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The basic form of a syntactic entity is:
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+---------+-------------+
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| tagByte | bodyOfThing |
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+---------+-------------+
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where 'tabByte' encodes how 'bodyOfThing' is to be interpreted.
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These are the possible 'thing's, as encoded by the 'tagByte's
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+------+
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identifier: | sym# | 'sym#' is an index into the symbol entries
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+------+ of the object file when the expression is
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in the object file too, and then 'sym#' is converted
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to a pointer to symbol structure when the symbol
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itself is read in.
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+-------+-------+------+------+-----+
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functionCall: | func# | argCt | expr | expr | ... | 'argCt' is a
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+-------+-------+------+------+-----+ single byte
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argument count (which means that a function may have
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no more than 255 arguments if it is to be used
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externally) and this is how many 'expr's there are.
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+-----+
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number: | num | 'num' is just a 4-byte number.
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+-----+
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+----+
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conditionCode: | cc | 'cc' is a single byte condition code.
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+----+
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+------+
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subexpression: | expr |
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+------+
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+----+------+
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unop: | op | expr | 'op' is a 1-byte operation number.
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+----+------+
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+----+------+------+
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binop: | op | expr | expr |
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+----+------+------+
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+----+------+
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preop: | op | expr |
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+----+------+
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+----+------+
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postop: | op | expr |
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+----+------+
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here: empty body.
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+---+---+---+---+-----+----+
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string: | a | b | c | d | ... | \0 | Typical 'C' string.
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+---+---+---+---+-----+----+
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+------+------+
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array: | sym# | expr |
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+------+------+
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+-----+
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value: | num |
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+-----+
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null: empty body. Encodes null expression *or* statement.
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+-------+-------+-----+-----+
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block: | thing | thing | ... | end | 'end' acts as a
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+-------+-------+-----+-----+ termination symbol.
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+------+------+
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mdefine: | sym# | expr | 'expr' can be null.
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+------+------+
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+------+------+
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mvar: | sym# | expr | 'expr' can be null.
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+------+------+
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+------+-------+-------+
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mif: | expr | block | block | either 'block' can be null.
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+------+-------+-------+
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+------+------+------+-------+
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mfor: | expr | expr | expr | block |
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+------+------+------+-------+
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+------+-------+
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mwhile: | expr | block |
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+------+-------+
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+------+-------+
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mdoWhile: | expr | block |
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+------+-------+
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+------+-------+
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mdoUntil: | expr | block |
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+------+-------+
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+------+
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freturn: | expr |
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+------+
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+------+
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perform: | expr |
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+------+
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+-------+
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group: | block |
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+-------+
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+------+--------+
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assert: | expr | string |
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+------+--------+
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+------+--------+--------+-----+-----+
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mswitch: | expr | clause | clause | ... | end |
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+------+--------+--------+-----+-----+
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+------+------+-----+-------+
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clause: | expr | expr | ... | block |
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+------+------+-----+-------+
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end: empty body.
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*/
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#define IDENTIFIER_TAG 0x00
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#define FUNCTION_CALL_TAG 0x01
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#define NUMBER_TAG 0x02
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#define CONDITION_CODE_TAG 0x03
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#define SUBEXPRESSION_TAG 0x04
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#define UNOP_TAG 0x05
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#define BINOP_TAG 0x06
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#define PREOP_TAG 0x07
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#define POSTOP_TAG 0x08
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#define HERE_TAG 0x09
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#define STRING_TAG 0x0A
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#define ARRAY_TAG 0x0B
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#define VALUE_TAG 0x0C
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#define NULL_TAG 0x0D
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#define BLOCK_TAG 0x0E
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#define MDEFINE_TAG 0x0F
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#define MVARIABLE_TAG 0x10
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#define MIF_TAG 0x11
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#define MFOR_TAG 0x12
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#define MWHILE_TAG 0x13
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#define MDOWHILE_TAG 0x14
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#define MDOUNTIL_TAG 0x15
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#define PERFORM_TAG 0x16
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#define GROUP_TAG 0x17
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#define ASSERT_TAG 0x18
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#define MSWITCH_TAG 0x19
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#define CLAUSE_TAG 0x1A
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#define END_TAG 0x1B
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#define FRETURN_TAG 0x1C
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#define BUILTIN_FUNCTION_CALL_TAG 0x1D
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#define RELOCATABLE_TAG 0x1E
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