Program Analysis and Compilation, Theory and Practice: by Thomas Reps, Mooly Sagiv, Jörg Bauer

By Thomas Reps, Mooly Sagiv, Jörg Bauer

Reinhard Wilhelm's profession in laptop technological know-how spans greater than a 3rd of a century. in this time, he has made a number of study contributions to the parts of programming languages, compilers and compiler turbines, static software research, application transformation, set of rules animation, and real-time platforms; co-founded a firm to move a few of these principles to undefined; held the Chair for Programming Languages and Compiler development at Saarland collage; and served on the grounds that its inception in 1990 because the medical Director of the foreign convention and learn heart for laptop technological know-how at Schloss Dagstuhl.

This Festschrift quantity, released to honor Reinhard Wilhelm on his sixtieth Birthday on June 10, 2006, comprises 15 refereed papers via best researchers, his graduate scholars and learn collaborators, in addition to present and previous colleagues, who all attended a celebratory symposium held at Schloss Dagstuhl, Germany. The articles of this quantity hence serve additionally because the court cases of the aforementioned Dagstuhl symposium.

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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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