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1、””≮’“’955613後旦大擎博士學(xué)位論文學(xué)校代碼:10246學(xué)號(hào):031021042Java實(shí)時(shí)性及嵌入式實(shí)時(shí)Java處理器研究院系:專業(yè):姓名:指導(dǎo)教師:完成日期:信息科學(xué)與工程學(xué)院計(jì)算機(jī)系統(tǒng)結(jié)構(gòu)柴志雷涂時(shí)亮教授2006年4月15日摘要當(dāng)時(shí)實(shí)時(shí)Java規(guī)范尚未推出。本文設(shè)計(jì)了一種能在低成本FPGA芯片中實(shí)現(xiàn)的硬實(shí)時(shí)嵌入式Java處理器HRTEJ(HardReal.TuneEmbeddedJavaProcessor),目標(biāo)是實(shí)現(xiàn)具有硬實(shí)時(shí)特性的嵌入式Java處理器并對(duì)實(shí)時(shí)Java規(guī)范提供有效支持
2、。該處理器實(shí)現(xiàn)了一些特殊的硬件機(jī)制提供對(duì)實(shí)時(shí)Java規(guī)范中異步傳輸控制、線程管理和調(diào)度、同步與共享、以及內(nèi)存管理的支持。并通過對(duì)實(shí)時(shí)Java規(guī)范中內(nèi)存管理的改進(jìn),簡(jiǎn)化了應(yīng)用程序員的開發(fā)接口。同時(shí),本文還提出了針對(duì)JavaClass文件的優(yōu)化方法,根據(jù)該優(yōu)化方法,所有影響系統(tǒng)實(shí)時(shí)性的操作都在程序運(yùn)行之前得到處理,在保證指令最壞執(zhí)行時(shí)間(WCET)g預(yù)測(cè)性的同時(shí)也簡(jiǎn)化了處理器本身的實(shí)現(xiàn)。關(guān)鍵字:Java實(shí)時(shí)性、Java平臺(tái)、Java虛擬機(jī)、嵌入式實(shí)時(shí)Java處理器、實(shí)時(shí)Java規(guī)范、最壞執(zhí)行時(shí)間中圖分類
3、號(hào):TP316.2AbstradAbstractThecomplexityofembeddedreal-timesystemskeepsgrowingandnovelmethodsandtoolsarerequired.Comparedtosoftwaredevelopmentfordesktopsystems,currentsoftwaredesignpracticeforembeddedsystemsisstillarchaic.o,c++ande%renassembleraleusedonto
4、pofasmallreal-timeoperatingsystem.ManyoftheadvantagesofJava,suchassafeobjectreferences,thenotionofconcurrencyasafirst-classlanguageconstruct,anditsportability,havethepotentialtomakeembeddedsystemsmuchsaferandsimplertoprogram.Withtheadvantagesmentioneda
5、bove,Javaisincrcasin【elyexpectedtobecometheleadingprogramminglanguageinembeddedsystems.Mostoftheembeddedsystemsarereal—timesystems.Javatechnologyisseldomusedinembeddedsystemscurrently,duetothelackofacceptablereal-timeperformance.Toimprovethereal-tlmepe
6、rformancespecifiedintheJavaLanguageS1cIecificationandtheJavaVirtualMachineSpecification,GrogBollellaetalproposetheReal-TuneSpecificationforJava(I盯sJ).Itprovidesaguidelinefortheimplementationofreal-timeJavaplatform.Currently,toprovideanefficientJavaplat
7、formsuitableforreal—timeapplications,manydifferentimplementationsaleproposed.Theseimplementations∞nbegenerallyclassifiedasInterpreter(aninterpretingprogramrunningontheoperatingsystemthat啪interpretandexecutejavabytecodeundertheassistanceoftheos),Ahead-o
8、f-TimeCompiler(Javabytecodeiscom-piledintonativecodeoranintermediatelanguagesuch勰Cinadvance).a(chǎn)ndJavaProcessor(theJavaplatformisimplementeddirectlyonsilicon)etc.Javaprocessornotonlyavoidstheoverheadoftranslationofthebytecodetoanotherproc