Changes between Version 32 and Version 33 of PIRCDevelopment

Timestamp:

08/16/09 20:31:02 (12 years ago)

Author:

kjs

Comment:

various updates

PIRCDevelopment

@@ -284 +284 @@
 == Macro layer ==
 
+The macro layer is implemented in both the lexer and the scanner. The syntax to define and expand macros is defined in the parser. This is a fundamental difference from how macros are implemented in IMCC. In IMCC, the macro layer is completely implemented in the lexer.
+
+Currently, basic macros work, but nested macros do not. This needs to be fixed.
+
 == PIRC Parser ==
 
+The parser is implemented in [source:/trunk/compilers/pirc/src/pir.y]. This is a parser specification that needs to be processed by the Bison program in order to generate the C file. 
+
 == Symbol Management ==
+
+Symbol management is implemented in [source:/trunk/compilers/pirc/src/pirsymbol.c]. Symbols declared using the {{{.local}}} directive are stored in a symbol table. Whenever an identifier is parsed, it will be looked up in this symbol table.
+
+All uses of PIR registers (e.g. $I42) are registered as well. The first time a PIR register is used, it is assigned a PASM register. This process is called "coloring". The word "color" is often used in the context of register allocation, since the "classic" algorithm to do so is called "graph-coloring". While the vanilla register allocator does not such algorithm, the field "color" is used for storing the actual PASM register number that was assigned.
+
 
 == Constant Folding ==