Integers and Booleans (true, false) are the only basic data types. ... Memory is allocated every time an instance of a class or an array is created. ...
... Current implementation Can handle Standard ML and MiniJava Types are now propagated through all optimization phases ... r3 , 4(r2) add r2,r4,r1 ... Princeton/Yale ...
Translation to Intermediate Code. Intermediate representation (IR) Abstract syntax tree ... is a class holding all machine related information: FP() is the ...
But abstracts from the concrete syntax = more compact and easier to use ... Attributes for the Line Calculator (Cont.) Each P has a synthesized attribute val ...
Rarely used alone (the downfall of Algol 68) Can be used to verify/prove properties (with difficulty) Informal textual. CFG natural language (Algol 60, Java ...
So far a parser traces the derivation of a sequence of tokens ... Calculated from attributes of descendents in the parse tree. E.val is a synthesized attribute ...
A CFG consists of. A set of terminals T. A set of non-terminals N ... The Language of a CFG ... The CFG idea for describing languages is a powerful concept. ...
... realize that those funny squiggles aren't x's--they're special ... Read in 'source code' text. Construct some model of the program. Provide error messages. ...
Two temporaries can share the same register if. they are never 'in ... may erroneously believe a variable is live, but will never erroneously believe it is dead ...
Some timings of compilation vs interpretation. Lecture 16. Prof. Fateman CS 164 Lecture 16 ... (not required in CL but generally done if optimizing) Makes ...