Advanced Design and Implementation of Virtual Machines by Xiao-Feng Li

By Xiao-Feng Li

In addition to the more and more vital runtime engines pervasive in our daily-life computing, there's a robust call for from the software program neighborhood for an outstanding presentation at the layout and implementation of recent digital machines, together with the Java digital computer, javascript engine and Android execution engine. The neighborhood expects to work out not just formal set of rules description, but in addition pragmatic code snippets to appreciate not just study subject matters, but in addition engineering recommendations. This ebook meets those calls for by means of supplying a different description that mixes excessive point layout with low point implementations and educational complex issues with advertisement ideas. This publication takes a holistic method of the layout of VM structure, with contents equipped right into a constant framework, introducing themes and algorithms in an simply understood step-by-step strategy. It makes a speciality of the serious points of VM layout, that are frequently ignored in different works, comparable to runtime helpers, stack unwinding and local interface. The algorithms are totally illustrated in figures and applied in effortless to digest code snippets, making the summary innovations tangible and programmable for process software program builders.

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But starting from Java Standard Edition (SE) 7, both JVM specification and Java language specification are published in tandem under the same Java SE version. When an application is provided to a JVM, the JVM’s class loader loads and parses the initial class file and puts the items into corresponding data structures in memory. Then JVM resolves all the symbolic references into direct references as memory addresses. , its initializer is invoked), JVM calls the main() method of the initial class to execute the application.

Tracing execution) from the entrance, which is the start point of the trace. ” For loop-based tracing, the trace end point is where the control goes back to the start point. For basic-block-based tracing, the end point is the exit point of the basic block. In both approaches, the length of a trace is limited to avoid the execution strays away from the expected path. Tracing process may give up due to some unsupported conditions, such as exception-throwing or entering runtime services. Loop-based trace may have some intermediate points where the control branches off the hot path.

3. Control safety ensures that the flow of code execution never reach any point that either gets stuck or goes wild, for example, jump to a malicious code segment. Control safety can be considered a special kind of operation safety. Almost all modern languages such as Java, C#, Java bytecode, Microsoft Intermediate Language, and JavaScript are safe languages, although their individual safety extents can be different. To support a safe language, a virtual machine is necessary because the safe language itself cannot fulfill all the safety requirements.

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