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Dalvik\u662f\u4e4b\u524dAndroid\u7cfb\u7edf\u4f7f\u7528\u7684Java\u865a\u62df\u673a\uff0c\u90a3\u4e48ART\u662f\u4ec0\u4e48\u5462?<\/p>\n
ART\u662f\u4e00\u4e2aAOT\u7f16\u8bd1\u5668\u3002\u6240\u8c13AOT (Ahead of Time)\u662f\u6307\u5728\u8fd0\u884c\u4ee5\u524d\u5c31\u628a\u4e2d\u95f4\u4ee3\u7801\u9759\u6001\u7f16\u8bd1\u6210\u672c\u5730\u4ee3\u7801\uff0c\u800cJIT (Just inTime)\u5219\u662f\u5728\u8fd0\u884c\u65f6\u52a8\u6001\u7f16\u8bd1\u3002<\/p>\n
AOT\u548cJIT\u6bd4\u5404\u6709\u957f\u5904\uff0c\u8fd9\u91cc\u4e0d\u8be6\u7ec6\u5c55\u5f00\uff0c\u53ea\u7b80\u5355\u5217\u4e3e\u51e0\u4e2a\u6700\u4e3b\u8981\u7684\uff1a<\/p>\n
AOT\u7684\u4e3b\u8981\u7f16\u8bd1\u8fc7\u7a0b\u53d1\u751f\u4e8e\u5f00\u53d1\u7528\u673a\uff0c\u56e0\u6b64\u7f16\u8bd1\u5f97\u6162\u4e00\u70b9\u6ca1\u5173\u7cfb\uff0c\u53ef\u4ee5\u5145\u5206\u7684\u505a\u5404\u79cd\u8017\u65f6\u7684\u4f18\u5316;JIT\u5728\u8fd0\u884c\u65f6\u52a8\u6001\u7f16\u8bd1\uff0c\u901a\u5e38\u4e0d\u80fd\u505a\u592a\u8017\u65f6\u7684\u4f18\u5316\uff0c\u5426\u5219\u5f71\u54cd\u542f\u52a8\u548c\u8fd0\u884c\u901f\u5ea6<\/p>\n
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\u56e0\u4e3a\u53d7\u4f18\u5316\u7a0b\u5ea6\u9650\u5236\uff0cJIT\u7f16\u8bd1\u51fa\u6765\u7684\u672c\u5730\u4ee3\u7801\u4f53\u79ef\u901a\u5e38\u6bd4\u8f83\u5927\uff0c5\u523010\u500d\u4e8ebytecode\u90fd\u662f\u6b63\u5e38\u7684\u3002AOT\u7f16\u8bd1\u51fa\u6765\u7684\u672c\u5730\u4ee3\u7801\u4f53\u79ef\u66f4\u5c0f\u3002Android\u7684JIT code cache\u4e5f\u662f\u5185\u5b58\u5360\u7528\u7684\u91cd\u8981\u89d2\u8272\u3002<\/p>\n
\u56e0\u4e3a\u662f\u9884\u7f16\u8bd1\u597d\u7684\u673a\u5668\u4ee3\u7801\uff0cAOT\u4ea7\u751f\u7684\u4ee3\u7801\u548c\u52a0\u8f7d\u6267\u884c\u8fc7\u7a0b\u548c\u666e\u901a\u7684\u672c\u5730\u4ee3\u7801\u6ca1\u6709\u592a\u5927\u5206\u522b\u3002\u4e0d\u8fc7\u4ecd\u7136\u9700\u8981\u8fd0\u884c\u65f6\u7684GC\u652f\u6301\u3002<\/p>\n
\u867d\u7136AOT\u53ef\u4ee5\u6709\u66f4\u591a\u7684\u65f6\u95f4\u548c\u7a7a\u95f4\u505a\u7f16\u8bd1\u4f18\u5316\uff0c\u4f46\u5e76\u4e0d\u7b49\u4e8e\u6027\u80fd\u4e0a\u5c31\u4e00\u5b9a\u80dc\u8fc7JIT\u3002JVM\u6709\u4e0d\u5c11\u4e1c\u897f\u53ea\u80fd\u5728\u8fd0\u884c\u65f6\u52a8\u6001\u51b3\u5b9a\u662f\u5426\u53ef\u4ee5\u91c7\u7528\u7f16\u8bd1\u4f18\u5316(\u5982 \u8bc6\u522b\u53ef\u4ee5inline\u7684\u865a\u65b9\u6cd5)\uff0c\u4ee5\u53ca\u8fd0\u884c\u65f6\u52a8\u6001\u53cd\u4f18\u5316(\u4f8b\u5982inline\u4e86\u4e00\u4e2a\u865a\u65b9\u6cd5\uff0c\u540e\u6765\u53d1\u73b0\u9047\u5230\u65b0\u7684\u6d3e\u751f\u7c7b\u7684\u5b9e\u4f8b\uff0c\u5c31\u9700\u8981\u53d6\u6d88\u539f\u6765\u7684 inline)\u3002\u8fd9\u4e9b\u4e8b\u60c5AOT\u5c31\u4e0d\u5bb9\u6613\u505a\u5230\u3002<\/p>\n
AOT\u7684\u7f16\u8bd1\u5668\u4e00\u822c\u4f1a\u5206\u4e24\u4e2a\u7248\u672c\uff0c\u4e00\u4e2a\u5728\u5f00\u53d1\u673a\u4e0a\u7f16\u8bd1\u6574\u4e2a\u7cfb\u7edf\u548c\u9884\u88c5\u5e94\u7528\uff0c\u53e6\u4e00\u4e2a\u662f\u4e00\u4e2a\u7cbe\u7b80\u7248\uff0c\u5728\u8bbe\u5907\u4e0a\u8fd0\u884c\uff0c\u8d1f\u8d23\u7f16\u8bd1\u8fde\u63a5\u65b0\u5b89\u88c5\u7684\u5e94\u7528\u3002<\/p>\n
AOT\u7f16\u8bd1\u51fa\u6765\u7684\u4ee3\u7801\u4ecd\u7136\u9700\u8981\u8fd0\u884c\u65f6\u7684\u652f\u6301\uff0c\u7279\u522b\u662fGC\u3002<\/p>\n
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\u7b80\u5355\u7684\u8bf4\u5c31\u662f\u4ee5\u66f4\u9ad8\u7684\u6267\u884c\u6548\u7387\u6765\u8fd0\u884c\u8f6f\u4ef6art\u5e94\u8be5\u5229\u7528\u4e86LLVM<\/p>\n
\u6027\u80fd\u5c31\u63d0\u5347\u4e86\uff0c\u53e6\u4e00\u65b9\u9762\u9884\u8f7d\u7684\u79c1\u6709\u8f6f\u4ef6\u4e5f\u53ef\u4ee5\u51ed\u6b64\u505a\u597d\u4fdd\u5bc6\u5de5\u4f5c\uff0c\u7559\u5728\u673a\u5668\u4e0a\u7684\u7a0b\u5e8f\u672c\u4f53\u662f\u673a\u5668\u7801\u4e86\uff0c\u6ca1\u6709deoat\u4e86\u3002<\/p>\n
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\u76ee\u524d\u7684Chrome\u652f\u6301pNACL\uff0c\u4e5f\u662f\u4e00\u79cd\u4ee5(LLVM)\u5b57\u8282\u7801\u53d1\u5e03\uff0c\u5230\u672c\u5730\u518d\u7f16\u8bd1\u7684\u6a21\u5f0f\u3002\u5982\u6b64\u80fd\u83b7\u5f97\u63a5\u8fd1\u90a3\u4e9b\u76f4\u63a5\u88ab\u7f16\u8bd1\u4e3a\u539f\u751f\u4ee3\u7801\u7684\u8f6f\u4ef6\u7684\u6027\u80fd\u3002<\/p>\n
Mozilla\u7ed9\u51fa\u7684\u66ff\u4ee3\u54c1\u662fasm.js\uff0c\u5219\u662f\u7528javascript\u5f15\u64ce\u6267\u884cC++\u672c\u673a\u4ee3\u7801\u3002<\/p>\n
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