daixinyu@nju.edu.cn70()4: 8-10am 10-12am II-212http://cs.nju.edu.cn/dxy/compiler.htm: hugn@nlp.nju.edu.cn shangd@nlp.nju.edu.cn

compiler

C++ C Python C

vs. vs. Java

Javac Hello.javaJava HelloC

CompilerObject file (.o .obj .dcu)LinkerAssemblerlibraries (.lib)assembly file (.a .asm)executable file (.exe)source file (.c .pas )OS (.dll, .so)Loaderprocess vs. Analysis - - front endSynthesisback end

lexical analysis, scanning

/(lexeme) token-nameattribute-value/position = initial + rate * 60 syntax analysis/parsing

/syntax tree

(Semantic Analysis)(meaning)

(Interesting examples)Jack said Jerry left his assignment at home.

Jack said Jack left his assignment at home?

compiler@stanford 19(Intermediate-Code Generation)t1 = inttofloat(60) t2 = id3 * t1; t3 = id2 + t2;

(Code Optimization)

(Code Generation)

Pass vs. : lex/flex yacc/bison-Fortran, Pascal, Lisp, Modula, CNOMAD, SQL, PostscriptPrologOPS5

Simula, Smalltalk, Modula3, C++, Object Pascal, Java, C#

1///RISC2///

1/Javastaticxxxx2

3CC/publicprivateprotected

4

5 (call by value)/(call by reference)