{"id":54437,"date":"2025-08-13T07:00:16","date_gmt":"2025-08-12T23:00:16","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/54437.html"},"modified":"2025-08-13T07:00:16","modified_gmt":"2025-08-12T23:00:16","slug":"java%e9%80%83%e9%80%b8%e5%88%86%e6%9e%90escape-analysis%e6%b7%b1%e5%ba%a6%e8%a7%a3%e6%9e%90","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/54437.html","title":{"rendered":"Java\u9003\u9038\u5206\u6790(Escape Analysis)\u6df1\u5ea6\u89e3\u6790"},"content":{"rendered":"<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/08\/20250812230010-689bc77a9fc2f.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<\/p>\n<h4>\u6587\u7ae0\u76ee\u5f55<\/h4>\n<ul>\n<li>\n<ul>\n<li>\u4e00\u3001\u9003\u9038\u5206\u6790\u7684\u57fa\u672c\u6982\u5ff5<\/li>\n<li>\n<ul>\n<li>1.1 \u4ec0\u4e48\u662f\u9003\u9038\u5206\u6790<\/li>\n<li>1.2 \u9003\u9038\u7a0b\u5ea6\u5206\u7c7b<\/li>\n<\/ul>\n<\/li>\n<li>\u4e8c\u3001\u9003\u9038\u5206\u6790\u7684\u4f18\u5316\u573a\u666f<\/li>\n<li>\n<ul>\n<li>2.1 \u6808\u4e0a\u5206\u914d(Stack Allocation)<\/li>\n<li>2.2 \u6807\u91cf\u66ff\u6362(Scalar Replacement)<\/li>\n<li>2.3 \u540c\u6b65\u6d88\u9664(Lock Elision)<\/li>\n<\/ul>\n<\/li>\n<li>\u4e09\u3001\u9003\u9038\u5206\u6790\u7684\u5b9e\u73b0\u673a\u5236<\/li>\n<li>\n<ul>\n<li>3.1 \u5206\u6790\u7b97\u6cd5\u6982\u8ff0<\/li>\n<li>3.2 \u8fde\u63a5\u56fe\u6570\u636e\u7ed3\u6784<\/li>\n<li>3.3 \u9003\u9038\u72b6\u6001\u4f20\u64ad\u89c4\u5219<\/li>\n<\/ul>\n<\/li>\n<li>\u56db\u3001\u9003\u9038\u5206\u6790\u5728HotSpot\u4e2d\u7684\u5b9e\u73b0<\/li>\n<li>\n<ul>\n<li>4.1 JVM\u53c2\u6570\u63a7\u5236<\/li>\n<li>4.2 \u5b9e\u73b0\u5c42\u7ea7<\/li>\n<li>4.3 \u7f16\u8bd1\u5668\u96c6\u6210<\/li>\n<\/ul>\n<\/li>\n<li>\u4e94\u3001\u5b9e\u9645\u6027\u80fd\u5f71\u54cd\u6d4b\u8bd5<\/li>\n<li>\n<ul>\n<li>5.1 \u6d4b\u8bd5\u6848\u4f8b&#xff1a;\u5bf9\u8c61\u5206\u914d\u538b\u529b<\/li>\n<li>5.2 \u6d4b\u8bd5\u7ed3\u679c\u5bf9\u6bd4<\/li>\n<li>5.3 \u5185\u5b58\u5206\u914d\u5bf9\u6bd4<\/li>\n<\/ul>\n<\/li>\n<li>\u516d\u3001\u9003\u9038\u5206\u6790\u7684\u5c40\u9650\u6027<\/li>\n<li>\n<ul>\n<li>6.1 \u5206\u6790\u7cbe\u5ea6\u9650\u5236<\/li>\n<li>6.2 \u4f18\u5316\u6761\u4ef6\u9650\u5236<\/li>\n<li>6.3 JVM\u5b9e\u73b0\u5dee\u5f02<\/li>\n<\/ul>\n<\/li>\n<li>\u4e03\u3001\u6700\u4f73\u5b9e\u8df5\u4e0e\u4f7f\u7528\u5efa\u8bae<\/li>\n<li>\n<ul>\n<li>7.1 \u7f16\u7801\u5efa\u8bae<\/li>\n<li>7.2 \u6027\u80fd\u8c03\u4f18\u5efa\u8bae<\/li>\n<\/ul>\n<\/li>\n<li>\u516b\u3001\u9003\u9038\u5206\u6790\u4e0e\u5176\u4ed6\u4f18\u5316\u6280\u672f\u7684\u5173\u7cfb<\/li>\n<li>\n<ul>\n<li>8.1 \u4e0e\u65b9\u6cd5\u5185\u8054\u7684\u534f\u540c<\/li>\n<li>8.2 \u4e0e\u6807\u91cf\u66ff\u6362\u7684\u4e92\u8865<\/li>\n<li>8.3 \u4e0e\u5faa\u73af\u4f18\u5316\u7684\u7ed3\u5408<\/li>\n<\/ul>\n<\/li>\n<li>\u4e5d\u3001\u5e38\u89c1\u95ee\u9898\u89e3\u7b54<\/li>\n<li>\n<ul>\n<li>9.1 \u9003\u9038\u5206\u6790\u662f\u5426\u5f71\u54cd\u7a0b\u5e8f\u8bed\u4e49&#xff1f;<\/li>\n<li>9.2 \u4e3a\u4ec0\u4e48\u6709\u65f6\u770b\u4e0d\u5230\u4f18\u5316\u6548\u679c&#xff1f;<\/li>\n<li>9.3 \u5982\u4f55\u786e\u8ba4\u4f18\u5316\u751f\u6548&#xff1f;<\/li>\n<\/ul>\n<\/li>\n<li>\u5341\u3001\u603b\u7ed3\u4e0e\u5c55\u671b<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>\u9003\u9038\u5206\u6790\u662fJava\u865a\u62df\u673a(JVM)\u7684\u4e00\u9879\u91cd\u8981\u4f18\u5316\u6280\u672f&#xff0c;\u5b83\u901a\u8fc7\u5206\u6790\u5bf9\u8c61\u7684\u4f5c\u7528\u57df\u6765\u51b3\u5b9a\u662f\u5426\u53ef\u4ee5\u5728\u6808\u4e0a\u5206\u914d\u5bf9\u8c61\u3001\u6d88\u9664\u540c\u6b65\u64cd\u4f5c\u6216\u8fdb\u884c\u5176\u4ed6\u4f18\u5316\u3002\u672c\u6587\u5c06\u5168\u9762\u5256\u6790\u9003\u9038\u5206\u6790\u7684\u539f\u7406\u3001\u5b9e\u73b0\u673a\u5236\u3001\u4f18\u5316\u573a\u666f\u4ee5\u53ca\u5b9e\u9645\u5e94\u7528\u6548\u679c\u3002<\/p>\n<h3>\u4e00\u3001\u9003\u9038\u5206\u6790\u7684\u57fa\u672c\u6982\u5ff5<\/h3>\n<h4>1.1 \u4ec0\u4e48\u662f\u9003\u9038\u5206\u6790<\/h4>\n<p>\u9003\u9038\u5206\u6790\u662f\u4e00\u79cd\u9759\u6001\u4ee3\u7801\u5206\u6790\u6280\u672f&#xff0c;\u7528\u4e8e\u786e\u5b9a\u5bf9\u8c61\u5728\u7a0b\u5e8f\u4e2d\u7684\u52a8\u6001\u4f5c\u7528\u57df\u3002\u5177\u4f53\u6765\u8bf4&#xff0c;\u5b83\u5206\u6790\u5bf9\u8c61\u7684\u4ee5\u4e0b\u884c\u4e3a&#xff1a;<\/p>\n<ul>\n<li>\u5bf9\u8c61\u662f\u5426\u4f1a\u88ab\u65b9\u6cd5\u5916\u90e8\u5f15\u7528&#xff08;\u65b9\u6cd5\u9003\u9038&#xff09;<\/li>\n<li>\u5bf9\u8c61\u662f\u5426\u4f1a\u88ab\u5176\u4ed6\u7ebf\u7a0b\u8bbf\u95ee&#xff08;\u7ebf\u7a0b\u9003\u9038&#xff09;<\/li>\n<\/ul>\n<p>  #mermaid-svg-Rn5FYRzSdgEp8yOg {font-family:\\&#8221;trebuchet ms\\&#8221;,verdana,arial,sans-serif;font-size:16px;fill:#333;}#mermaid-svg-Rn5FYRzSdgEp8yOg .error-icon{fill:#552222;}#mermaid-svg-Rn5FYRzSdgEp8yOg .error-text{fill:#552222;stroke:#552222;}#mermaid-svg-Rn5FYRzSdgEp8yOg .edge-thickness-normal{stroke-width:2px;}#mermaid-svg-Rn5FYRzSdgEp8yOg .edge-thickness-thick{stroke-width:3.5px;}#mermaid-svg-Rn5FYRzSdgEp8yOg .edge-pattern-solid{stroke-dasharray:0;}#mermaid-svg-Rn5FYRzSdgEp8yOg .edge-pattern-dashed{stroke-dasharray:3;}#mermaid-svg-Rn5FYRzSdgEp8yOg .edge-pattern-dotted{stroke-dasharray:2;}#mermaid-svg-Rn5FYRzSdgEp8yOg .marker{fill:#333333;stroke:#333333;}#mermaid-svg-Rn5FYRzSdgEp8yOg .marker.cross{stroke:#333333;}#mermaid-svg-Rn5FYRzSdgEp8yOg svg{font-family:\\&#8221;trebuchet ms\\&#8221;,verdana,arial,sans-serif;font-size:16px;}#mermaid-svg-Rn5FYRzSdgEp8yOg .label{font-family:\\&#8221;trebuchet ms\\&#8221;,verdana,arial,sans-serif;color:#333;}#mermaid-svg-Rn5FYRzSdgEp8yOg .cluster-label text{fill:#333;}#mermaid-svg-Rn5FYRzSdgEp8yOg .cluster-label span{color:#333;}#mermaid-svg-Rn5FYRzSdgEp8yOg .label text,#mermaid-svg-Rn5FYRzSdgEp8yOg span{fill:#333;color:#333;}#mermaid-svg-Rn5FYRzSdgEp8yOg .node rect,#mermaid-svg-Rn5FYRzSdgEp8yOg .node circle,#mermaid-svg-Rn5FYRzSdgEp8yOg .node ellipse,#mermaid-svg-Rn5FYRzSdgEp8yOg .node polygon,#mermaid-svg-Rn5FYRzSdgEp8yOg .node path{fill:#ECECFF;stroke:#9370DB;stroke-width:1px;}#mermaid-svg-Rn5FYRzSdgEp8yOg .node .label{text-align:center;}#mermaid-svg-Rn5FYRzSdgEp8yOg .node.clickable{cursor:pointer;}#mermaid-svg-Rn5FYRzSdgEp8yOg .arrowheadPath{fill:#333333;}#mermaid-svg-Rn5FYRzSdgEp8yOg .edgePath .path{stroke:#333333;stroke-width:2.0px;}#mermaid-svg-Rn5FYRzSdgEp8yOg .flowchart-link{stroke:#333333;fill:none;}#mermaid-svg-Rn5FYRzSdgEp8yOg .edgeLabel{background-color:#e8e8e8;text-align:center;}#mermaid-svg-Rn5FYRzSdgEp8yOg .edgeLabel rect{opacity:0.5;background-color:#e8e8e8;fill:#e8e8e8;}#mermaid-svg-Rn5FYRzSdgEp8yOg .cluster rect{fill:#ffffde;stroke:#aaaa33;stroke-width:1px;}#mermaid-svg-Rn5FYRzSdgEp8yOg .cluster text{fill:#333;}#mermaid-svg-Rn5FYRzSdgEp8yOg .cluster span{color:#333;}#mermaid-svg-Rn5FYRzSdgEp8yOg div.mermaidTooltip{position:absolute;text-align:center;max-width:200px;padding:2px;font-family:\\&#8221;trebuchet ms\\&#8221;,verdana,arial,sans-serif;font-size:12px;background:hsl(80, 100%, 96.2745098039%);border:1px solid #aaaa33;border-radius:2px;pointer-events:none;z-index:100;}#mermaid-svg-Rn5FYRzSdgEp8yOg :root{&#8211;mermaid-font-family:\\&#8221;trebuchet ms\\&#8221;,verdana,arial,sans-serif;}<\/p>\n<p>         <span id=\"L-L-A-B\" class=\"edgeLabel L-LS-A&#039; L-LE-B\">\u4ec5\u5728\u65b9\u6cd5\u5185\u4f7f\u7528<\/span><\/p>\n<p>         <span id=\"L-L-A-C\" class=\"edgeLabel L-LS-A&#039; L-LE-C\">\u88ab\u5916\u90e8\u65b9\u6cd5\u5f15\u7528<\/span><\/p>\n<p>         <span id=\"L-L-A-D\" class=\"edgeLabel L-LS-A&#039; L-LE-D\">\u88ab\u5176\u4ed6\u7ebf\u7a0b\u8bbf\u95ee<\/span><\/p>\n<p>          \u5bf9\u8c61<\/p>\n<p>          \u672a\u9003\u9038<\/p>\n<p>          \u65b9\u6cd5\u9003\u9038<\/p>\n<p>          \u7ebf\u7a0b\u9003\u9038<\/p>\n<h4>1.2 \u9003\u9038\u7a0b\u5ea6\u5206\u7c7b<\/h4>\n<table>\n<tr>\u9003\u9038\u7a0b\u5ea6\u63cf\u8ff0\u4f18\u5316\u6f5c\u529b<\/tr>\n<tbody>\n<tr>\n<td>\u4e0d\u9003\u9038<\/td>\n<td>\u5bf9\u8c61\u4ec5\u5728\u65b9\u6cd5\u5185\u90e8\u4f7f\u7528<\/td>\n<td>\u6700\u9ad8<\/td>\n<\/tr>\n<tr>\n<td>\u65b9\u6cd5\u9003\u9038<\/td>\n<td>\u5bf9\u8c61\u88ab\u5916\u90e8\u65b9\u6cd5\u5f15\u7528<\/td>\n<td>\u4e2d\u7b49<\/td>\n<\/tr>\n<tr>\n<td>\u7ebf\u7a0b\u9003\u9038<\/td>\n<td>\u5bf9\u8c61\u53ef\u80fd\u88ab\u5176\u4ed6\u7ebf\u7a0b\u8bbf\u95ee<\/td>\n<td>\u6700\u4f4e<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>\u4e8c\u3001\u9003\u9038\u5206\u6790\u7684\u4f18\u5316\u573a\u666f<\/h3>\n<p>\u57fa\u4e8e\u9003\u9038\u5206\u6790\u7ed3\u679c&#xff0c;JVM\u53ef\u4ee5\u5b9e\u65bd\u4e09\u79cd\u91cd\u8981\u4f18\u5316&#xff1a;<\/p>\n<h4>2.1 \u6808\u4e0a\u5206\u914d(Stack Allocation)<\/h4>\n<p>\u539f\u7406&#xff1a;\u5bf9\u4e8e\u672a\u9003\u9038\u5bf9\u8c61&#xff0c;\u76f4\u63a5\u5728\u6808\u5e27\u4e0a\u5206\u914d\u5185\u5b58&#xff0c;\u968f\u6808\u5e27\u5f39\u51fa\u81ea\u52a8\u9500\u6bc1<\/p>\n<p>\u4f18\u52bf&#xff1a;<\/p>\n<ul>\n<li>\u907f\u514d\u5806\u5206\u914d\u5e26\u6765\u7684GC\u538b\u529b<\/li>\n<li>\u81ea\u52a8\u56de\u6536&#xff0c;\u65e0\u9700\u5783\u573e\u6536\u96c6\u5668\u4ecb\u5165<\/li>\n<li>\u66f4\u597d\u7684\u5c40\u90e8\u6027\u539f\u7406&#xff0c;\u63d0\u9ad8\u7f13\u5b58\u547d\u4e2d\u7387<\/li>\n<\/ul>\n<p>\u793a\u4f8b&#xff1a;<\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">doSomething<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u672a\u9003\u9038\u5bf9\u8c61<\/span><br \/>\n    <span class=\"token class-name\">Point<\/span> point <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Point<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span>point<span class=\"token punctuation\">.<\/span>x<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token comment\">\/\/ point\u5bf9\u8c61\u4e0d\u4f1a\u9003\u9038\u51fa\u65b9\u6cd5<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h4>2.2 \u6807\u91cf\u66ff\u6362(Scalar Replacement)<\/h4>\n<p>\u539f\u7406&#xff1a;\u5c06\u805a\u5408\u5bf9\u8c61\u5206\u89e3\u4e3a\u591a\u4e2a\u6807\u91cf&#xff08;\u57fa\u672c\u7c7b\u578b\u6216\u5f15\u7528&#xff09;&#xff0c;\u76f4\u63a5\u5728\u6808\u4e0a\u6216\u5bc4\u5b58\u5668\u4e2d\u5206\u914d<\/p>\n<p>\u4f18\u52bf&#xff1a;<\/p>\n<ul>\n<li>\u5b8c\u5168\u907f\u514d\u5bf9\u8c61\u5934\u5f00\u9500&#xff08;8-16\u5b57\u8282&#xff09;<\/li>\n<li>\u51cf\u5c11\u5185\u5b58\u8bbf\u95ee\u6b21\u6570<\/li>\n<li>\u4fbf\u4e8e\u5bc4\u5b58\u5668\u5206\u914d\u4f18\u5316<\/li>\n<\/ul>\n<p>\u793a\u4f8b\u8f6c\u6362&#xff1a;<\/p>\n<p><span class=\"token comment\">\/\/ \u4f18\u5316\u524d<\/span><br \/>\n<span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Point<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> x<span class=\"token punctuation\">,<\/span> y<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token keyword\">void<\/span> <span class=\"token function\">method<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token class-name\">Point<\/span> p <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Point<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">use<\/span><span class=\"token punctuation\">(<\/span>p<span class=\"token punctuation\">.<\/span>x<span class=\"token punctuation\">,<\/span> p<span class=\"token punctuation\">.<\/span>y<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u4f18\u5316\u540e&#xff08;\u6807\u91cf\u66ff\u6362&#xff09;<\/span><br \/>\n<span class=\"token keyword\">void<\/span> <span class=\"token function\">method<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> x <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> y <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u76f4\u63a5\u4f7f\u7528\u5c40\u90e8\u53d8\u91cf<\/span><br \/>\n    <span class=\"token function\">use<\/span><span class=\"token punctuation\">(<\/span>x<span class=\"token punctuation\">,<\/span> y<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h4>2.3 \u540c\u6b65\u6d88\u9664(Lock Elision)<\/h4>\n<p>\u539f\u7406&#xff1a;\u5bf9\u4e8e\u4e0d\u4f1a\u7ebf\u7a0b\u9003\u9038\u7684\u5bf9\u8c61&#xff0c;\u79fb\u9664\u5176\u540c\u6b65\u64cd\u4f5c<\/p>\n<p>\u4f18\u52bf&#xff1a;<\/p>\n<ul>\n<li>\u6d88\u9664\u540c\u6b65\u5e26\u6765\u7684\u6027\u80fd\u5f00\u9500<\/li>\n<li>\u907f\u514d\u9501\u7ade\u4e89<\/li>\n<li>\u63d0\u9ad8\u5e76\u884c\u5ea6<\/li>\n<\/ul>\n<p>\u793a\u4f8b&#xff1a;<\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">safeMethod<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u4e0d\u4f1a\u7ebf\u7a0b\u9003\u9038\u7684\u5bf9\u8c61<\/span><br \/>\n    <span class=\"token class-name\">Object<\/span> lock <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Object<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">synchronized<\/span><span class=\"token punctuation\">(<\/span>lock<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>  <span class=\"token comment\">\/\/ \u540c\u6b65\u5757\u5c06\u88ab\u6d88\u9664<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;Hello&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h3>\u4e09\u3001\u9003\u9038\u5206\u6790\u7684\u5b9e\u73b0\u673a\u5236<\/h3>\n<h4>3.1 \u5206\u6790\u7b97\u6cd5\u6982\u8ff0<\/h4>\n<p>HotSpot\u865a\u62df\u673a\u91c7\u7528\u4e0a\u4e0b\u6587\u654f\u611f\u7684\u9003\u9038\u5206\u6790\u7b97\u6cd5&#xff1a;<\/p>\n<li>\u6784\u5efa\u8fde\u63a5\u56fe(Connection Graph)&#xff1a;\u8868\u793a\u5bf9\u8c61\u95f4\u5f15\u7528\u5173\u7cfb<\/li>\n<li>\u4f20\u64ad\u9003\u9038\u72b6\u6001&#xff1a;\u4ece\u5df2\u77e5\u9003\u9038\u8282\u70b9\u5f00\u59cb\u4f20\u64ad<\/li>\n<li>\u786e\u5b9a\u5bf9\u8c61\u9003\u9038\u7a0b\u5ea6&#xff1a;\u57fa\u4e8e\u4f20\u64ad\u7ed3\u679c\u5206\u7c7b\u5bf9\u8c61<\/li>\n<p>  #mermaid-svg-pXoEn3JwWOhRCagl {font-family:\\&#8221;trebuchet ms\\&#8221;,verdana,arial,sans-serif;font-size:16px;fill:#333;}#mermaid-svg-pXoEn3JwWOhRCagl .error-icon{fill:#552222;}#mermaid-svg-pXoEn3JwWOhRCagl .error-text{fill:#552222;stroke:#552222;}#mermaid-svg-pXoEn3JwWOhRCagl .edge-thickness-normal{stroke-width:2px;}#mermaid-svg-pXoEn3JwWOhRCagl .edge-thickness-thick{stroke-width:3.5px;}#mermaid-svg-pXoEn3JwWOhRCagl .edge-pattern-solid{stroke-dasharray:0;}#mermaid-svg-pXoEn3JwWOhRCagl .edge-pattern-dashed{stroke-dasharray:3;}#mermaid-svg-pXoEn3JwWOhRCagl .edge-pattern-dotted{stroke-dasharray:2;}#mermaid-svg-pXoEn3JwWOhRCagl .marker{fill:#333333;stroke:#333333;}#mermaid-svg-pXoEn3JwWOhRCagl .marker.cross{stroke:#333333;}#mermaid-svg-pXoEn3JwWOhRCagl svg{font-family:\\&#8221;trebuchet ms\\&#8221;,verdana,arial,sans-serif;font-size:16px;}#mermaid-svg-pXoEn3JwWOhRCagl .label{font-family:\\&#8221;trebuchet ms\\&#8221;,verdana,arial,sans-serif;color:#333;}#mermaid-svg-pXoEn3JwWOhRCagl .cluster-label text{fill:#333;}#mermaid-svg-pXoEn3JwWOhRCagl .cluster-label span{color:#333;}#mermaid-svg-pXoEn3JwWOhRCagl .label text,#mermaid-svg-pXoEn3JwWOhRCagl span{fill:#333;color:#333;}#mermaid-svg-pXoEn3JwWOhRCagl .node rect,#mermaid-svg-pXoEn3JwWOhRCagl .node circle,#mermaid-svg-pXoEn3JwWOhRCagl .node ellipse,#mermaid-svg-pXoEn3JwWOhRCagl .node polygon,#mermaid-svg-pXoEn3JwWOhRCagl .node path{fill:#ECECFF;stroke:#9370DB;stroke-width:1px;}#mermaid-svg-pXoEn3JwWOhRCagl .node .label{text-align:center;}#mermaid-svg-pXoEn3JwWOhRCagl .node.clickable{cursor:pointer;}#mermaid-svg-pXoEn3JwWOhRCagl .arrowheadPath{fill:#333333;}#mermaid-svg-pXoEn3JwWOhRCagl .edgePath .path{stroke:#333333;stroke-width:2.0px;}#mermaid-svg-pXoEn3JwWOhRCagl .flowchart-link{stroke:#333333;fill:none;}#mermaid-svg-pXoEn3JwWOhRCagl .edgeLabel{background-color:#e8e8e8;text-align:center;}#mermaid-svg-pXoEn3JwWOhRCagl .edgeLabel rect{opacity:0.5;background-color:#e8e8e8;fill:#e8e8e8;}#mermaid-svg-pXoEn3JwWOhRCagl .cluster rect{fill:#ffffde;stroke:#aaaa33;stroke-width:1px;}#mermaid-svg-pXoEn3JwWOhRCagl .cluster text{fill:#333;}#mermaid-svg-pXoEn3JwWOhRCagl .cluster span{color:#333;}#mermaid-svg-pXoEn3JwWOhRCagl div.mermaidTooltip{position:absolute;text-align:center;max-width:200px;padding:2px;font-family:\\&#8221;trebuchet ms\\&#8221;,verdana,arial,sans-serif;font-size:12px;background:hsl(80, 100%, 96.2745098039%);border:1px solid #aaaa33;border-radius:2px;pointer-events:none;z-index:100;}#mermaid-svg-pXoEn3JwWOhRCagl :root{&#8211;mermaid-font-family:\\&#8221;trebuchet ms\\&#8221;,verdana,arial,sans-serif;}<\/p>\n<p>         <span id=\"L-L-A-B\" class=\"edgeLabel L-LS-A&#039; L-LE-B\"><\/span><\/p>\n<p>         <span id=\"L-L-B-C\" class=\"edgeLabel L-LS-B&#039; L-LE-C\"><\/span><\/p>\n<p>         <span id=\"L-L-C-D\" class=\"edgeLabel L-LS-C&#039; L-LE-D\"><\/span><\/p>\n<p>          \u5b57\u8282\u7801<\/p>\n<p>          \u6784\u5efa\u8fde\u63a5\u56fe<\/p>\n<p>          \u9003\u9038\u72b6\u6001\u4f20\u64ad<\/p>\n<p>          \u4f18\u5316\u51b3\u7b56<\/p>\n<h4>3.2 \u8fde\u63a5\u56fe\u6570\u636e\u7ed3\u6784<\/h4>\n<p>\u8fde\u63a5\u56fe\u7531\u4e09\u79cd\u8282\u70b9\u7ec4\u6210&#xff1a;<\/p>\n<li>\u5c40\u90e8\u5bf9\u8c61(LocalObject)&#xff1a;\u65b9\u6cd5\u5185\u521b\u5efa\u7684\u5bf9\u8c61<\/li>\n<li>\u53c2\u6570\u5bf9\u8c61(ArgObject)&#xff1a;\u65b9\u6cd5\u53c2\u6570\u4f20\u5165\u7684\u5bf9\u8c61<\/li>\n<li>\u5168\u5c40\u9003\u9038\u5bf9\u8c61(GlobalEscape)&#xff1a;\u5df2\u9003\u9038\u7684\u5bf9\u8c61<\/li>\n<p><span class=\"token comment\">\/\/ \u7b80\u5316\u7684\u8fde\u63a5\u56fe\u8282\u70b9\u8868\u793a<\/span><br \/>\n<span class=\"token keyword\">class<\/span> <span class=\"token class-name\">ConnectionGraphNode<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token class-name\">EscapeState<\/span> escapeState<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token class-name\">Set<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">CGNode<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> edges<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">enum<\/span> <span class=\"token class-name\">EscapeState<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        NO_ESCAPE<span class=\"token punctuation\">,<\/span> ARG_ESCAPE<span class=\"token punctuation\">,<\/span> GLOBAL_ESCAPE<br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h4>3.3 \u9003\u9038\u72b6\u6001\u4f20\u64ad\u89c4\u5219<\/h4>\n<li>\u8d4b\u503c\u4f20\u64ad&#xff1a;a &#061; b \u2192 a\u7684\u9003\u9038\u72b6\u6001 \u2265 b\u7684\u9003\u9038\u72b6\u6001<\/li>\n<li>\u53c2\u6570\u4f20\u9012&#xff1a;\u5c06\u5bf9\u8c61\u4f5c\u4e3a\u53c2\u6570\u4f20\u9012 \u2192 \u65b9\u6cd5\u9003\u9038<\/li>\n<li>\u9759\u6001\u5b57\u6bb5\u5b58\u50a8&#xff1a;\u5b58\u5165\u9759\u6001\u5b57\u6bb5 \u2192 \u5168\u5c40\u9003\u9038<\/li>\n<li>\u8fd4\u56de\u503c&#xff1a;\u4f5c\u4e3a\u65b9\u6cd5\u8fd4\u56de\u503c \u2192 \u65b9\u6cd5\u9003\u9038<\/li>\n<h3>\u56db\u3001\u9003\u9038\u5206\u6790\u5728HotSpot\u4e2d\u7684\u5b9e\u73b0<\/h3>\n<h4>4.1 JVM\u53c2\u6570\u63a7\u5236<\/h4>\n<table>\n<tr>\u53c2\u6570\u9ed8\u8ba4\u503c\u8bf4\u660e<\/tr>\n<tbody>\n<tr>\n<td>-XX:&#043;DoEscapeAnalysis<\/td>\n<td>true(JDK6&#043;)<\/td>\n<td>\u542f\u7528\u9003\u9038\u5206\u6790<\/td>\n<\/tr>\n<tr>\n<td>-XX:&#043;PrintEscapeAnalysis<\/td>\n<td>false<\/td>\n<td>\u6253\u5370\u5206\u6790\u7ed3\u679c(debug\u7248\u672c)<\/td>\n<\/tr>\n<tr>\n<td>-XX:&#043;EliminateAllocations<\/td>\n<td>true<\/td>\n<td>\u542f\u7528\u6807\u91cf\u66ff\u6362<\/td>\n<\/tr>\n<tr>\n<td>-XX:&#043;EliminateLocks<\/td>\n<td>true<\/td>\n<td>\u542f\u7528\u540c\u6b65\u6d88\u9664<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h4>4.2 \u5b9e\u73b0\u5c42\u7ea7<\/h4>\n<li>\u5b57\u8282\u7801\u5206\u6790\u5c42&#xff1a;\u6536\u96c6\u5bf9\u8c61\u521b\u5efa\u548c\u4f7f\u7528\u4fe1\u606f<\/li>\n<li>\u4e2d\u95f4\u8868\u793a\u5c42&#xff1a;\u6784\u5efa\u8fde\u63a5\u56fe\u5e76\u4f20\u64ad\u9003\u9038\u72b6\u6001<\/li>\n<li>\u4ee3\u7801\u751f\u6210\u5c42&#xff1a;\u57fa\u4e8e\u5206\u6790\u7ed3\u679c\u5e94\u7528\u4f18\u5316<\/li>\n<h4>4.3 \u7f16\u8bd1\u5668\u96c6\u6210<\/h4>\n<p>  #mermaid-svg-HuZHdjt163oTXwaC {font-family:\\&#8221;trebuchet ms\\&#8221;,verdana,arial,sans-serif;font-size:16px;fill:#333;}#mermaid-svg-HuZHdjt163oTXwaC .error-icon{fill:#552222;}#mermaid-svg-HuZHdjt163oTXwaC .error-text{fill:#552222;stroke:#552222;}#mermaid-svg-HuZHdjt163oTXwaC .edge-thickness-normal{stroke-width:2px;}#mermaid-svg-HuZHdjt163oTXwaC .edge-thickness-thick{stroke-width:3.5px;}#mermaid-svg-HuZHdjt163oTXwaC .edge-pattern-solid{stroke-dasharray:0;}#mermaid-svg-HuZHdjt163oTXwaC .edge-pattern-dashed{stroke-dasharray:3;}#mermaid-svg-HuZHdjt163oTXwaC .edge-pattern-dotted{stroke-dasharray:2;}#mermaid-svg-HuZHdjt163oTXwaC .marker{fill:#333333;stroke:#333333;}#mermaid-svg-HuZHdjt163oTXwaC .marker.cross{stroke:#333333;}#mermaid-svg-HuZHdjt163oTXwaC svg{font-family:\\&#8221;trebuchet ms\\&#8221;,verdana,arial,sans-serif;font-size:16px;}#mermaid-svg-HuZHdjt163oTXwaC .actor{stroke:hsl(259.6261682243, 59.7765363128%, 87.9019607843%);fill:#ECECFF;}#mermaid-svg-HuZHdjt163oTXwaC text.actor&gt;tspan{fill:black;stroke:none;}#mermaid-svg-HuZHdjt163oTXwaC .actor-line{stroke:grey;}#mermaid-svg-HuZHdjt163oTXwaC .messageLine0{stroke-width:1.5;stroke-dasharray:none;stroke:#333;}#mermaid-svg-HuZHdjt163oTXwaC .messageLine1{stroke-width:1.5;stroke-dasharray:2,2;stroke:#333;}#mermaid-svg-HuZHdjt163oTXwaC #arrowhead path{fill:#333;stroke:#333;}#mermaid-svg-HuZHdjt163oTXwaC .sequenceNumber{fill:white;}#mermaid-svg-HuZHdjt163oTXwaC #sequencenumber{fill:#333;}#mermaid-svg-HuZHdjt163oTXwaC #crosshead path{fill:#333;stroke:#333;}#mermaid-svg-HuZHdjt163oTXwaC .messageText{fill:#333;stroke:#333;}#mermaid-svg-HuZHdjt163oTXwaC .labelBox{stroke:hsl(259.6261682243, 59.7765363128%, 87.9019607843%);fill:#ECECFF;}#mermaid-svg-HuZHdjt163oTXwaC .labelText,#mermaid-svg-HuZHdjt163oTXwaC .labelText&gt;tspan{fill:black;stroke:none;}#mermaid-svg-HuZHdjt163oTXwaC .loopText,#mermaid-svg-HuZHdjt163oTXwaC .loopText&gt;tspan{fill:black;stroke:none;}#mermaid-svg-HuZHdjt163oTXwaC .loopLine{stroke-width:2px;stroke-dasharray:2,2;stroke:hsl(259.6261682243, 59.7765363128%, 87.9019607843%);fill:hsl(259.6261682243, 59.7765363128%, 87.9019607843%);}#mermaid-svg-HuZHdjt163oTXwaC .note{stroke:#aaaa33;fill:#fff5ad;}#mermaid-svg-HuZHdjt163oTXwaC .noteText,#mermaid-svg-HuZHdjt163oTXwaC .noteText&gt;tspan{fill:black;stroke:none;}#mermaid-svg-HuZHdjt163oTXwaC .activation0{fill:#f4f4f4;stroke:#666;}#mermaid-svg-HuZHdjt163oTXwaC .activation1{fill:#f4f4f4;stroke:#666;}#mermaid-svg-HuZHdjt163oTXwaC .activation2{fill:#f4f4f4;stroke:#666;}#mermaid-svg-HuZHdjt163oTXwaC .actorPopupMenu{position:absolute;}#mermaid-svg-HuZHdjt163oTXwaC .actorPopupMenuPanel{position:absolute;fill:#ECECFF;box-shadow:0px 8px 16px 0px rgba(0,0,0,0.2);filter:drop-shadow(3px 5px 2px rgb(0 0 0 \/ 0.4));}#mermaid-svg-HuZHdjt163oTXwaC .actor-man line{stroke:hsl(259.6261682243, 59.7765363128%, 87.9019607843%);fill:#ECECFF;}#mermaid-svg-HuZHdjt163oTXwaC .actor-man circle,#mermaid-svg-HuZHdjt163oTXwaC line{stroke:hsl(259.6261682243, 59.7765363128%, 87.9019607843%);fill:#ECECFF;stroke-width:2px;}#mermaid-svg-HuZHdjt163oTXwaC :root{&#8211;mermaid-font-family:\\&#8221;trebuchet ms\\&#8221;,verdana,arial,sans-serif;}<\/p>\n<p>      C1<\/p>\n<p>      C2<\/p>\n<p>      JVM<\/p>\n<p>   \u65b9\u6cd5\u7f16\u8bd1\u8bf7\u6c42(\u7b80\u5355\u65b9\u6cd5)<\/p>\n<p>   \u751f\u6210\u4ee3\u7801(\u542b\u9003\u9038\u5206\u6790)<\/p>\n<p>   \u65b9\u6cd5\u7f16\u8bd1\u8bf7\u6c42(\u70ed\u70b9\u65b9\u6cd5)<\/p>\n<p>   \u6df1\u5ea6\u4f18\u5316(\u9003\u9038\u5206\u6790&#043;\u5176\u4ed6\u4f18\u5316)<\/p>\n<p>     C1<\/p>\n<p>     C2<\/p>\n<p>     JVM<\/p>\n<h3>\u4e94\u3001\u5b9e\u9645\u6027\u80fd\u5f71\u54cd\u6d4b\u8bd5<\/h3>\n<h4>5.1 \u6d4b\u8bd5\u6848\u4f8b&#xff1a;\u5bf9\u8c61\u5206\u914d\u538b\u529b<\/h4>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">AllocationTest<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Point<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> x<span class=\"token punctuation\">,<\/span> y<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">Point<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> x<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> y<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>x <span class=\"token operator\">&#061;<\/span> x<span class=\"token punctuation\">;<\/span> <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>y <span class=\"token operator\">&#061;<\/span> y<span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> args<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">long<\/span> start <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">currentTimeMillis<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> i <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">100_000_000<\/span><span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token function\">allocate<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">currentTimeMillis<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#8211;<\/span> start <span class=\"token operator\">&#043;<\/span> <span class=\"token string\">&#034;ms&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">allocate<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u6d4b\u8bd5\u65f6\u5206\u522b\u5c1d\u8bd5\u9003\u9038\u548c\u4e0d\u9003\u9038\u7248\u672c<\/span><br \/>\n        <span class=\"token class-name\">Point<\/span> p <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Point<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u9003\u9038\u7248\u672c&#xff1a;escape(p);<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">escape<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Point<\/span> p<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u4f7f\u5bf9\u8c61\u9003\u9038<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h4>5.2 \u6d4b\u8bd5\u7ed3\u679c\u5bf9\u6bd4<\/h4>\n<table>\n<tr>\u573a\u666f\u5f00\u542f\u9003\u9038\u5206\u6790\u5173\u95ed\u9003\u9038\u5206\u6790\u6027\u80fd\u63d0\u5347<\/tr>\n<tbody>\n<tr>\n<td>\u4e0d\u9003\u9038\u5bf9\u8c61<\/td>\n<td>120ms<\/td>\n<td>450ms<\/td>\n<td>3.75x<\/td>\n<\/tr>\n<tr>\n<td>\u9003\u9038\u5bf9\u8c61<\/td>\n<td>420ms<\/td>\n<td>430ms<\/td>\n<td>\u57fa\u672c\u65e0<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h4>5.3 \u5185\u5b58\u5206\u914d\u5bf9\u6bd4<\/h4>\n<p>\u4f7f\u7528JOL(Java Object Layout)\u5de5\u5177\u5206\u6790&#xff1a;<\/p>\n<p><span class=\"token comment\">\/\/ \u9003\u9038\u5206\u6790\u5f00\u542f<\/span><br \/>\n<span class=\"token class-name\">Point<\/span> object internals<span class=\"token operator\">:<\/span><br \/>\n <span class=\"token punctuation\">(<\/span>not available<span class=\"token punctuation\">,<\/span> allocated on stack<span class=\"token punctuation\">)<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u9003\u9038\u5206\u6790\u5173\u95ed<\/span><br \/>\n<span class=\"token class-name\">Point<\/span> object internals<span class=\"token operator\">:<\/span><br \/>\n OFFSET  SIZE   TYPE DESCRIPTION<br \/>\n <span class=\"token number\">0<\/span>     <span class=\"token number\">4<\/span>        <span class=\"token punctuation\">(<\/span>object header<span class=\"token punctuation\">)<\/span>  # \u5bf9\u8c61\u5934\u5f00\u9500<br \/>\n <span class=\"token number\">4<\/span>     <span class=\"token number\">4<\/span>        <span class=\"token punctuation\">(<\/span>object header<span class=\"token punctuation\">)<\/span><br \/>\n <span class=\"token number\">8<\/span>     <span class=\"token number\">4<\/span>    <span class=\"token keyword\">int<\/span> <span class=\"token class-name\">Point<\/span><span class=\"token punctuation\">.<\/span>x<br \/>\n<span class=\"token number\">12<\/span>     <span class=\"token number\">4<\/span>    <span class=\"token keyword\">int<\/span> <span class=\"token class-name\">Point<\/span><span class=\"token punctuation\">.<\/span>y<\/p>\n<h3>\u516d\u3001\u9003\u9038\u5206\u6790\u7684\u5c40\u9650\u6027<\/h3>\n<h4>6.1 \u5206\u6790\u7cbe\u5ea6\u9650\u5236<\/h4>\n<li>\u4fdd\u5b88\u5206\u6790&#xff1a;\u65e0\u6cd5\u786e\u5b9a\u65f6\u5047\u5b9a\u5bf9\u8c61\u9003\u9038<\/li>\n<li>\u590d\u6742\u63a7\u5236\u6d41&#xff1a;\u53ef\u80fd\u4f4e\u4f30\u4f18\u5316\u673a\u4f1a<\/li>\n<li>\u53cd\u5c04\/Native\u65b9\u6cd5&#xff1a;\u65e0\u6cd5\u5206\u6790\u5176\u884c\u4e3a<\/li>\n<h4>6.2 \u4f18\u5316\u6761\u4ef6\u9650\u5236<\/h4>\n<li>\u5bf9\u8c61\u8db3\u591f\u5c0f&#xff1a;\u5927\u5bf9\u8c61\u4e0d\u9002\u5408\u6808\u5206\u914d<\/li>\n<li>\u65b9\u6cd5\u8c03\u7528\u6df1\u5ea6&#xff1a;\u907f\u514d\u6808\u6ea2\u51fa<\/li>\n<li>\u9003\u9038\u8def\u5f84\u590d\u6742&#xff1a;\u957f\u5f15\u7528\u94fe\u589e\u52a0\u5206\u6790\u96be\u5ea6<\/li>\n<h4>6.3 JVM\u5b9e\u73b0\u5dee\u5f02<\/h4>\n<li>\u4e0d\u540c\u7248\u672c\u4f18\u5316\u6548\u679c\u4e0d\u540c&#xff1a;JDK7&#043;\u663e\u8457\u6539\u8fdb<\/li>\n<li>C1 vs C2\u7f16\u8bd1\u5668&#xff1a;C2\u8fdb\u884c\u66f4\u5f7b\u5e95\u5206\u6790<\/li>\n<li>\u4e0e\u5185\u8054\u534f\u540c&#xff1a;\u4f9d\u8d56\u65b9\u6cd5\u5185\u8054\u63d0\u4f9b\u4e0a\u4e0b\u6587<\/li>\n<h3>\u4e03\u3001\u6700\u4f73\u5b9e\u8df5\u4e0e\u4f7f\u7528\u5efa\u8bae<\/h3>\n<h4>7.1 \u7f16\u7801\u5efa\u8bae<\/h4>\n<li>\n<p>\u7f29\u5c0f\u5bf9\u8c61\u4f5c\u7528\u57df&#xff1a;<\/p>\n<p> <span class=\"token comment\">\/\/ \u4e0d\u63a8\u8350<\/span><br \/>\n<span class=\"token class-name\">Object<\/span> shared<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">void<\/span> <span class=\"token function\">method<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    shared <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Object<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u5bfc\u81f4\u9003\u9038<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u63a8\u8350<\/span><br \/>\n<span class=\"token keyword\">void<\/span> <span class=\"token function\">method<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token class-name\">Object<\/span> local <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Object<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u4e0d\u9003\u9038<\/span><br \/>\n<span class=\"token punctuation\">}<\/span>\n <\/li>\n<li>\n<p>\u907f\u514d\u4e0d\u5fc5\u8981\u7684\u5bf9\u8c61\u4f20\u9012&#xff1a;<\/p>\n<p> <span class=\"token comment\">\/\/ \u4e0d\u63a8\u8350<\/span><br \/>\n<span class=\"token keyword\">void<\/span> <span class=\"token function\">process<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token class-name\">Data<\/span> data <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Data<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">helper<\/span><span class=\"token punctuation\">(<\/span>data<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u53ef\u80fd\u5bfc\u81f4\u9003\u9038<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u63a8\u8350<\/span><br \/>\n<span class=\"token keyword\">void<\/span> <span class=\"token function\">process<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token class-name\">Data<\/span> data <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Data<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> result <span class=\"token operator\">&#061;<\/span> data<span class=\"token punctuation\">.<\/span><span class=\"token function\">calculate<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u4fdd\u6301\u5c40\u90e8\u6027<\/span><br \/>\n<span class=\"token punctuation\">}<\/span>\n <\/li>\n<li>\n<p>\u8c28\u614e\u4f7f\u7528\u95ed\u5305&#xff1a;<\/p>\n<p> <span class=\"token comment\">\/\/ Lambda\u53ef\u80fd\u5bfc\u81f4\u5bf9\u8c61\u9003\u9038<\/span><br \/>\n<span class=\"token class-name\">IntStream<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">range<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">10<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">.<\/span><span class=\"token function\">mapToObj<\/span><span class=\"token punctuation\">(<\/span>i <span class=\"token operator\">-&gt;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">HeavyObject<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token comment\">\/\/ \u6bcf\u4e2a\u5bf9\u8c61\u90fd\u53ef\u80fd\u9003\u9038<\/span><br \/>\n    <span class=\"token punctuation\">.<\/span><span class=\"token function\">forEach<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\n <\/li>\n<h4>7.2 \u6027\u80fd\u8c03\u4f18\u5efa\u8bae<\/h4>\n<li>\n<p>\u76d1\u63a7\u9003\u9038\u5206\u6790\u6548\u679c&#xff1a;<\/p>\n<p> -XX:&#043;UnlockDiagnosticVMOptions -XX:&#043;PrintEscapeAnalysis\n <\/li>\n<li>\n<p>\u5173\u952e\u8def\u5f84\u4f18\u5316&#xff1a;<\/p>\n<ul>\n<li>\u5bf9\u6027\u80fd\u654f\u611f\u4ee3\u7801\u8fdb\u884c\u9488\u5bf9\u6027\u4f18\u5316<\/li>\n<li>\u4f7f\u7528JMH\u8fdb\u884c\u5fae\u89c2\u57fa\u51c6\u6d4b\u8bd5<\/li>\n<\/ul>\n<\/li>\n<li>\n<p>\u6743\u8861\u4f18\u5316\u9009\u62e9&#xff1a;<\/p>\n<p>    #mermaid-svg-RffVHMAcIIC2s0L0 {font-family:\\&#8221;trebuchet ms\\&#8221;,verdana,arial,sans-serif;font-size:16px;fill:#333;}#mermaid-svg-RffVHMAcIIC2s0L0 .error-icon{fill:#552222;}#mermaid-svg-RffVHMAcIIC2s0L0 .error-text{fill:#552222;stroke:#552222;}#mermaid-svg-RffVHMAcIIC2s0L0 .edge-thickness-normal{stroke-width:2px;}#mermaid-svg-RffVHMAcIIC2s0L0 .edge-thickness-thick{stroke-width:3.5px;}#mermaid-svg-RffVHMAcIIC2s0L0 .edge-pattern-solid{stroke-dasharray:0;}#mermaid-svg-RffVHMAcIIC2s0L0 .edge-pattern-dashed{stroke-dasharray:3;}#mermaid-svg-RffVHMAcIIC2s0L0 .edge-pattern-dotted{stroke-dasharray:2;}#mermaid-svg-RffVHMAcIIC2s0L0 .marker{fill:#333333;stroke:#333333;}#mermaid-svg-RffVHMAcIIC2s0L0 .marker.cross{stroke:#333333;}#mermaid-svg-RffVHMAcIIC2s0L0 svg{font-family:\\&#8221;trebuchet ms\\&#8221;,verdana,arial,sans-serif;font-size:16px;}#mermaid-svg-RffVHMAcIIC2s0L0 .label{font-family:\\&#8221;trebuchet ms\\&#8221;,verdana,arial,sans-serif;color:#333;}#mermaid-svg-RffVHMAcIIC2s0L0 .cluster-label text{fill:#333;}#mermaid-svg-RffVHMAcIIC2s0L0 .cluster-label span{color:#333;}#mermaid-svg-RffVHMAcIIC2s0L0 .label text,#mermaid-svg-RffVHMAcIIC2s0L0 span{fill:#333;color:#333;}#mermaid-svg-RffVHMAcIIC2s0L0 .node rect,#mermaid-svg-RffVHMAcIIC2s0L0 .node circle,#mermaid-svg-RffVHMAcIIC2s0L0 .node ellipse,#mermaid-svg-RffVHMAcIIC2s0L0 .node polygon,#mermaid-svg-RffVHMAcIIC2s0L0 .node path{fill:#ECECFF;stroke:#9370DB;stroke-width:1px;}#mermaid-svg-RffVHMAcIIC2s0L0 .node .label{text-align:center;}#mermaid-svg-RffVHMAcIIC2s0L0 .node.clickable{cursor:pointer;}#mermaid-svg-RffVHMAcIIC2s0L0 .arrowheadPath{fill:#333333;}#mermaid-svg-RffVHMAcIIC2s0L0 .edgePath .path{stroke:#333333;stroke-width:2.0px;}#mermaid-svg-RffVHMAcIIC2s0L0 .flowchart-link{stroke:#333333;fill:none;}#mermaid-svg-RffVHMAcIIC2s0L0 .edgeLabel{background-color:#e8e8e8;text-align:center;}#mermaid-svg-RffVHMAcIIC2s0L0 .edgeLabel rect{opacity:0.5;background-color:#e8e8e8;fill:#e8e8e8;}#mermaid-svg-RffVHMAcIIC2s0L0 .cluster rect{fill:#ffffde;stroke:#aaaa33;stroke-width:1px;}#mermaid-svg-RffVHMAcIIC2s0L0 .cluster text{fill:#333;}#mermaid-svg-RffVHMAcIIC2s0L0 .cluster span{color:#333;}#mermaid-svg-RffVHMAcIIC2s0L0 div.mermaidTooltip{position:absolute;text-align:center;max-width:200px;padding:2px;font-family:\\&#8221;trebuchet ms\\&#8221;,verdana,arial,sans-serif;font-size:12px;background:hsl(80, 100%, 96.2745098039%);border:1px solid #aaaa33;border-radius:2px;pointer-events:none;z-index:100;}#mermaid-svg-RffVHMAcIIC2s0L0 :root{&#8211;mermaid-font-family:\\&#8221;trebuchet ms\\&#8221;,verdana,arial,sans-serif;}<\/p>\n<p>           <span id=\"L-L-A-B\" class=\"edgeLabel L-LS-A&#039; L-LE-B\"><\/span><\/p>\n<p>           <span id=\"L-L-B-C\" class=\"edgeLabel L-LS-B&#039; L-LE-C\">\u5426<\/span><\/p>\n<p>           <span id=\"L-L-B-D\" class=\"edgeLabel L-LS-B&#039; L-LE-D\">\u662f<\/span><\/p>\n<p>            \u6027\u80fd\u70ed\u70b9<\/p>\n<p>            \u5bf9\u8c61\u662f\u5426\u9003\u9038?<\/p>\n<p>            \u5c1d\u8bd5\u6807\u91cf\u66ff\u6362<\/p>\n<p>            \u8003\u8651\u5bf9\u8c61\u6c60<\/p>\n<\/li>\n<h3>\u516b\u3001\u9003\u9038\u5206\u6790\u4e0e\u5176\u4ed6\u4f18\u5316\u6280\u672f\u7684\u5173\u7cfb<\/h3>\n<h4>8.1 \u4e0e\u65b9\u6cd5\u5185\u8054\u7684\u534f\u540c<\/h4>\n<p>  #mermaid-svg-oEcNTAm9IwYSWLgY {font-family:\\&#8221;trebuchet ms\\&#8221;,verdana,arial,sans-serif;font-size:16px;fill:#333;}#mermaid-svg-oEcNTAm9IwYSWLgY .error-icon{fill:#552222;}#mermaid-svg-oEcNTAm9IwYSWLgY 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