Apr24 - CSE302: Compiler Design Instructor: Dr. Liang Cheng...

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Unformatted text preview: CSE302: Compiler Design Instructor: Dr. Liang Cheng Department of Computer Science and Engineering P.C. Rossin College of Engineering & Applied Science Lehigh University April 24, 2007 Instructor: Dr. Liang Cheng CSE302: Compiler Design 04/24/07 Outline Recap Three address code generation Type checking Brief introduction to runtime environments Summary Instructor: Dr. Liang Cheng CSE302: Compiler Design 04/24/07 Translation of Expressions S id = E ; S.code = E.code || gen(top.get(id.lexeme) = E.addr) E E1 + E2 E.addr = new Temp() E.code = E1.code || E2.code || gen(E.addr = E1.addr + E2.addr) E - E1 E.addr = new Temp() E.code = E1.code || gen(E.addr = minus E1.addr) E ( E1 ) E.addr = E1.addr E.code = E1.code E id E.addr = top.get(id.lexeme) E.code = Instructor: Dr. Liang Cheng CSE302: Compiler Design 04/24/07 SDT of Array Type Declaration T B {t = B.type; w = B.width;} C { T.type = C.type; T.width = C.width; } B int {B.type = integer; B.width = 4;} B float {B.type = float; B.width = 8;} C [ num ] C1 { C.type = array( num .value, C1.type); C.width = num .value C1.width; } C {C.type = t; C.width = w;} Instructor: Dr. Liang Cheng CSE302: Compiler Design 04/24/07 Translation of Array References L id [ E ] L.array = top.get(id.lexeme) L.type = L.array.type.elem L.addr = new Temp() gen(L.addr = E.addr * L.type.width) L L1 [ E ] L.array = L1.array L.type = L1.type.elem t = new Temp() L.addr = new Temp() gen(t = E.addr * L.type.width ) gen(L.addr = L1.addr + t) S L = E ; gen(L.array.base [ L.addr ] = E.addr E L E.addr = new Temp() gen(E.addr = L.array.base [ L.addr ]) Instructor: Dr. Liang Cheng CSE302: Compiler Design 04/24/07 Translation of Control Flows and Boolean Expressions S if( {B.true=newlabel(); B.false=S.next;} B) S1 {S.code= B.code || label(B.true) || S1.code if B goto L1...
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This note was uploaded on 08/06/2008 for the course CSE 302 taught by Professor Cheng during the Spring '07 term at Lehigh University .

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Apr24 - CSE302: Compiler Design Instructor: Dr. Liang Cheng...

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