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

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 effective presentation at the layout and implementation of recent digital machines, together with the Java digital computing device, javascript engine and Android execution engine. The group expects to determine not just formal set of rules description, but additionally pragmatic code snippets to appreciate not just study themes, but in addition engineering recommendations. This booklet meets those calls for by way of offering a distinct description that mixes excessive point layout with low point implementations and educational complicated subject matters with advertisement recommendations. This ebook takes a holistic method of the layout of VM structure, with contents prepared right into a constant framework, introducing issues and algorithms in an simply understood step-by-step method. It makes a speciality of the severe features of VM layout, that are frequently ignored in different works, similar 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 recommendations tangible and programmable for procedure software program builders.

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Movl (%eax), %eax movl 16(%eax), %eax call %eax //eax now has vtable pointer //eax now has foo’s func_ptr //invoke foo() Before a method call, all the arguments should have been prepared by the caller (the method that makes the call), so we do not need to prepare them here again. When the last call instruction is executed, X86 processor automatically pushes the return address of the call on the stack, which points to the instruction after the call instruction. When the method is not compiled, the invocation actually goes to the trampoline as shown below, assuming method foo()’s description data structure is at 0x7001234, JIT compiler’s entrance is at address 0x7005678.

It may trigger the loader to load more data and code if those are referenced as symbols but not already loaded. Loader and dynamic linker are sometimes inseparable and implemented in single component. In some systems they are together solely called loader, while in some others called dynamic linker. Note virtual machine usually does not include linker. Linker is conventionally used to refer to the component that links multiple object files generated by a compiler into a single integral application package.

Note there is no instance of any interface, but instance whose class implements an interface. 1. A class defines two parts of data: instance data and class data. Instance data is owned by every object individually, while class data is shared by all the instances of same class. Every class is also internally represented as an object. There are two special classes in Java: Object and Class. lang in Java application programming interface. Class Object is the super class of all classes, and class Class is the type of all classes.

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