An Implementation Guide to Compiler Writing by Jean-Paul Tremblay

By Jean-Paul Tremblay

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Memory tree for example graph in Figure 15 Input : control flow graph (N, E, s, x) , results of a value analysis compute Drd , Dpdom , Ddom and Dmem for (N, E, s, x) while (no abort) { wait for new slicing criterion C = (n, V ) wset = {(n, v) | v ∈ V } vset = ∅ while (wset = ∅){ let (m, w) ∈ wset vset = vset ∪ {(m, w)} ∪ {(c, ) | c ∈ CtrlDep(m)} tset = {m} ∪ CtrlDep(m) wset = wset\{(m, w)} ∪ vset ∩ o∈tset, u∈def (o)\{M em} {(x, u) | x ∈ DataDep(o, u)} ∪ {(x, M em) | x ∈ M emDep(o)} } } slice = {m | (m, w) ∈ vset} Fig.

While guaranteeing the safeness of an application, the developer needs knowledge about targets of indirect call and branch instructions, which often depends on values stored in memory. Yet finding the program point(s) where the values were written to memory may be hard. Slicing may help the developer to find these point(s). Another application of slicing has already been introduced in Section 4, where slicing is used for restricting the set of possible execution paths through a program to detect infeasible paths.

However, the next assignment, val<=cnt;, schedules the next value of val to be the current value of cnt. These ‘future’ values scheduled by signal assignments take effect as soon as the process suspends its execution. A process suspends if it executes a wait S instruction, where S is a set of signal names. The process resumes execution as soon as a signal s ∈ S changes its value. In full VHDL, the wait instruction may also contain a timeout, after which the process resumes even if no signal from S changed its value in the meantime.

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