Spring 2011 CSCI 565 - Compiler Design

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Pedro Diniz pedro@isi.edu CSCI 565 - Compiler Design Three-Address Instructions • Control Transfer and Function Calls: – goto L (unconditional); – if (a relop b) goto L (conditional) where relop is a relational operator consistent with the type of the variables a and b; Spring 2011 – y = call p, n for a function or procedure call instruction to the name or variable p • p might be a variable holding a set of possible symbolic names (a function pointer) • the value n specifies that before this call there were n putparam instructions to load the values of the arguments. • the param x instruction specifies a specific value in reverse order (i.e, the param instruction closest to the call is the first argument value. • Later we will talk about parameter passing disciplines (Run-Time Env.)
Pedro Diniz pedro@isi.edu y = p(a, b+1) int p(x,z){ } CSCI 565 - Compiler Design Function Call Example Source Code Three Address Instructions return x+z; t1 = a t2 = b + 1 putparam t1 putparam t2 y = call p, 2 p: getparam z getparam x t3 = x + z return t3 return Spring 2011
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Spring 2011 CSCI 565 - Compiler Design

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