Program Specifications (spec)平：：={f+a]* (data heap) f1: a2 pc addu f 12 012 1w SW a3 f3: 3 r1 ￥2 r3 In jf (register file)R (code heap)c (state)s:=(H,R) (instr.seq.)I ::={f→I}* (program)P:=(c,s,pc)Program Specifications I1 f1: I2 f2: I3 f3: … (code heap) C 0 r1 1 2 … r2 r3 … rn (data heap) H (register file) R (state) S addu … lw … sw … … j f (instr. seq.) I (program) P::=(C,S,pc) ::=(H,R) ::={f  I}* pc a1 a2 a3 (spec)  ::= {f  a}*