By Prof. Dr. Robert F. Stärk, Dipl.-Inf. Joachim Schmid, Prof. Dr. Egon Börger (auth.)
This booklet presents a high-level description, including a mathematical and an experimental research, of Java and of the Java digital computer (JVM), together with a typical compiler of Java courses to JVM code and the safety serious bytecode verifier portion of the JVM. the outline is established into language layers and computer elements. It comes with a traditional executable refinement which might be used for trying out code. the tactic built for this function is predicated on summary country Machines (ASMs) and will be utilized to different digital machines and to different programming languages in addition. The publication is written for complicated scholars and for execs and practitioners in study and improvement who want for his or her paintings a whole and obvious definition and an executable version of the language and of the digital computing device underlying its meant implementation.
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Extra resources for Java and the Java Virtual Machine: Definition, Verification, Validation
Example text
This guarantees in particular that all statements complete abruptly which are passed through during the transfer of an abruption. 1. Abrupt transfer of control is illustrated in the following example: 11: while (Q exp ) { 12: while (13 exp) { } 'Y } <5 break 11; / / control goes to t5 continue 11; / / control goes to break 12; / / control goes to , continue 12; / / control goes to 0:: f3 44 3. 6 Derived language constructs Derived Java:r eXPl && exp2 expl ? exp2 : false expl I I exp2 eXPl ? 6 contains some Java constructs that can be syntactically reduced to the core language.
Is = []). copy ( i) (x) is the list consisting of i copies of x. h . b is the concatenation of the lists II and 12. push(ls, e) is the list Is . [e], the result of pushing e to (the right of) Is. top( Is) returns the right most (the last) element of the list Is. take ( Is , n) generalizes top (ls ), returning the list consisting of the last n elements of the list Is. pop (ls) returns the list Is without the right most (the last) element. drop(ls , n) generalizes pop(ls) , returning the list resulting from dropping the last n elements from the list Is.
Let E be a vocabulary. The transition rules R, S of an ASM are syntactic expressions generated as follows: 1. Skip Rule: skip Meaning: Do nothing. 2. Update Rule: J(tt, ... , tn ) := S Syntactic conditions: n-ary, dynamic function name of E - t I , ... , tn and s are terms of E Meaning: In the next state, the value of the function J at the arguments t I , . , tn is updated to s. e. , a constant. In this case, the update has the form c := s. - J is an 3. Block Rule: RS Meaning: Rand S are executed in parallel.