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General context free grammars - PowerPoint PPT Presentation

Compilers

Compilers. Machine Code. Program. Add v,v,0 cmp v,5 jmplt ELSE THEN: add x, 12,v ELSE: WHILE: cmp x,3. v = 5; if (v>5) x = 12 + v; while (x !=3) { x = x - 3; v = 10; }. Compiler. Compiler. Lexical analyzer. parser. input. output. machine code. program.

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568 views • 48 slides

Parsing

Parsing. Machine Code. Program File. Add v,v,5 cmp v,5 jmplt ELSE THEN: add x, 12,v ELSE: WHILE: cmp x,3. v = 5; if (v>5) x = 12 + v; while (x !=3) { x = x - 3; v = 10; }. Compiler. Compiler. Lexical analyzer. parser. Input String. Output. Program file.

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478 views • 47 slides

Lex

Lex. Lex is a lexical analyzer. Output. Ident: Var Integer: 12 Oper: + Integer: 9 Semicolumn: ; Keyword: if Paren: ( Ident: test Oper: >. Input. Var = 12 + 9; if (test > 20) temp = 0; else while (a < 20) temp++;. Lex. For each kind of strings

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421 views • 40 slides

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General context free grammars - PowerPoint PPT Presentation

Compilers

Parsing

Lex