12_MAR_2004 - Intermediate Code Generation Computer Science...

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Computer Science 332 Compiler Construction Chapter 8 Intermediate Code Generation Intermediate Code Generation Theoretically possible to translate directly from source language (ML) to target language (MIPS) But machine-independent intermediate representation is better because – It makes retargetting easier : single front-end with a back end for each new target architecture – We can do machine-independent optimizations on intermediate code parser ML static checker intermediate code generator code generator MIPS 8.1 Intermediate Languages Three-address code : sequence of statements of form x := y op z • where x , y , z are names, constants, or compiler-generated temporaries ( t1 , t2 , etc.) - ignore register/memory distinction op is any operator (arithmetic: + , * , logical and , or ) No buildup allowed: w := x + y * z source t1 := y * z t2 := x + t1 w := t2 intermediate (unoptimized) Like assembly language: – Can have symbolic labels, representing statement's address = index in an array of statements
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