jit

问题 Here is the original code //@author Brian Goetz and Tim Peierls @ThreadSafe public class SafePoint { @GuardedBy("this") private int x, y; private SafePoint(int[] a) { this(a[0], a[1]); } public SafePoint(SafePoint p) { this(p.get()); } public SafePoint(int x, int y) { this.set(x, y); } public synchronized int[] get() { return new int[]{x, y}; } public synchronized void set(int x, int y) { this.x = x; this.y = y; } } Here it is fine that the private int x,y are not final because the set method

问题 This question already has answers here : Call an absolute pointer in x86 machine code (2 answers) Closed 8 months ago . I'm writing a JIT compiler in C for x86_64 linux. Currently the idea is to generate some bytecode in a buffer of executable memory (e.g. obtained with an mmap call) and jump to it with a function pointer. I'd like to be able to link multiple blocks of executable memory together such that they can jump between each other using only native instructions. Ideally, the C-level

问题 I studied that Econo JIT is not optimized for the environment compiling the IL, different than the Normal JIT. Also, it doesn't create machine code cache for the next execution, which means every time the PE runs, the JIT compiles the IL into machine instructions again. I am confused why would One choose to compile in Econo Jit then. Also, is there a choice of JIT to be chosen in Visual Studio? or should I compile through prompt if I want to choose difference JIT mode? 回答1: The idea of Econo

问题 When I test my app directly on the device, it crashes because I'm attempting to JIT-compile a method. I know why these crashes occur, I'm just trying to make them appear when I'm testing on the simulator instead. It's much easier than deploying to a device every time (it also takes less time). I tried adding --aot-only to the mtouch arguments but I get the "Unknown command line argument" error. 回答1: No, there's no AOT compiler shipped for x86. Now even if there was one it would: a) become a

问题 I am an interested on working on dalvik vm (Android). I am trying to go through the code of JIT to find out the operations performed by it and how it selects the traces. I am unable to follow the code. So I request all to help me by suggesting relevant functions in JIT that performs trace selection and translation 回答1: You could try git log --grep JIT in the dalvik repository, and looking at the changes and the files changed. That should get you a good idea of where the JIT related code is.

问题 As we all know strings are implicitly instantiated, meaning that we don't have to use new in order to get a reference to an object of one. Because of this it was always my belief that the framework is taking care of this, and hence I would get identical IL if I did something like this: String first = new String(new char[] {'a'}); string second = "a"; However it appears that the first line is done using newobj instance void [mscorlib]System.String::.ctor(char[]) and the second ldstr "a" . So

问题 I have the following method: ApiResponse<T> PostMultipart<T>(string uploadUrl, NameValueCollection formParamters, params UploadFile[] uploadFiles); UploadFile is just a Poco: public class UploadFile { public string FilePath { get; set; } public string ContentType { get; set; } public string ParameterName { get; set; } } By calling that method, everyhing works fine on the simulator with "Debug|iPhoneSimulator" and on my iPod Touch with iOS 5.1.1 with "Release|iPhone". But when I am starting to

问题 Me and my friend are working on a portable internet radio driven by a Raspberry PI B+ and a little touch screen. I am developing the interface with Qt-5.9 which I've cross compiled for the ARMv6 CPU of the PI. My interface is using QML, so when I launch my app, everythings working but the QML animations are lagging. Accordingly the console tells me that the QML JIT is not enabled ( JIT is disabled for QML. Property bindings and animations will be very slow. Visit https://wiki.qt.io/V4 to

问题 There's that (relatively) well known Perl axiom, "Only perl can parse Perl." I'm wondering, will that remain true for Perl 6? Expanding the discussion... I thought of this question given the recent update of PyPy. Does Perl's unique parsability preclude it from similar efforts? Is there much value in a restricted, static view of Perl code (PPI?)? Can Perl 6 have a JIT compiler?* * I'm not sure if these concepts are related. Are they? 回答1: There is no perl6, and there are many Perl 6 compilers

问题 I'm interested in starting my own JIT project in C++. I'm not that unfamiliar with assembly, or compiler design etc etc. But, I am very unfamiliar with the resulting machine code format - like, what does a mov instruction actually look like when all is said and done and it's time to call that function pointer. So, what are the best resources for creating such a thing? Edit: Right now, I'm only interested in x86 on Windows, stretching a tiny bit to 64bit Windows in the future. 回答1: You want to