{"id":39344,"date":"2025-05-23T09:49:40","date_gmt":"2025-05-23T01:49:40","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/39344.html"},"modified":"2025-05-23T09:49:40","modified_gmt":"2025-05-23T01:49:40","slug":"02-golang-%e5%88%87%e7%89%87%ef%bc%88slice%ef%bc%89%e6%ba%90%e7%a0%81%e5%88%86%e6%9e%90%ef%bc%88%e4%b8%80%e3%80%81%e5%ae%9a%e4%b9%89%e4%b8%8e%e5%9f%ba%e7%a1%80%e6%93%8d%e4%bd%9c%e5%ae%9e%e7%8e%b0","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/39344.html","title":{"rendered":"02.Golang \u5207\u7247\uff08slice\uff09\u6e90\u7801\u5206\u6790\uff08\u4e00\u3001\u5b9a\u4e49\u4e0e\u57fa\u7840\u64cd\u4f5c\u5b9e\u73b0\uff09"},"content":{"rendered":"

Golang \u5207\u7247（slice）\u6e90\u7801\u5206\u6790（\u4e00\u3001\u5b9a\u4e49\u4e0e\u57fa\u7840\u64cd\u4f5c\u5b9e\u73b0）<\/h2>\n

\u6ce8\u610f\u5f53\u524dgo\u7248\u672c\u4ee3\u7801\u4e3a1.23<\/p>\n

\u4e00\u3001\u5b9a\u4e49<\/h3>\n

slice \u7684\u5e95\u5c42\u6570\u636e\u662f\u6570\u7ec4，slice \u662f\u5bf9\u6570\u7ec4\u7684\u5c01\u88c5，\u5b83\u63cf\u8ff0\u4e00\u4e2a\u6570\u7ec4\u7684\u7247\u6bb5\u3002\u4e24\u8005\u90fd\u53ef\u4ee5\u901a\u8fc7\u4e0b\u6807\u6765\u8bbf\u95ee\u5355\u4e2a\u5143\u7d20\u3002<\/p>\n

\u6570\u7ec4\u662f\u5b9a\u957f\u7684，\u957f\u5ea6\u5b9a\u4e49\u597d\u4e4b\u540e，\u4e0d\u80fd\u518d\u66f4\u6539\u3002\u5728 Go \u4e2d，\u6570\u7ec4\u662f\u4e0d\u5e38\u89c1\u7684，\u56e0\u4e3a\u5176\u957f\u5ea6\u662f\u7c7b\u578b\u7684\u4e00\u90e8\u5206，\u9650\u5236\u4e86\u5b83\u7684\u8868\u8fbe\u80fd\u529b，\u6bd4\u5982 [3]int \u548c [4]int \u5c31\u662f\u4e0d\u540c\u7684\u7c7b\u578b\u3002<\/p>\n

\u800c\u5207\u7247\u5219\u975e\u5e38\u7075\u6d3b，\u5b83\u53ef\u4ee5\u52a8\u6001\u5730\u6269\u5bb9\u3002\u5207\u7247\u7684\u7c7b\u578b\u548c\u957f\u5ea6\u65e0\u5173\u3002<\/p>\n

\u6570\u7ec4\u5c31\u662f\u4e00\u7247\u8fde\u7eed\u7684\u5185\u5b58， slice \u5b9e\u9645\u4e0a\u662f\u4e00\u4e2a\u7ed3\u6784\u4f53，\u5305\u542b\u4e09\u4e2a\u5b57\u6bb5：\u957f\u5ea6\u3001\u5bb9\u91cf\u3001\u5e95\u5c42\u6570\u7ec4\u3002<\/p>\n

type slice struct {
\narray unsafe.Pointer
\nlen int
\ncap int
\n}<\/p>\n

\u6570\u636e\u7ed3\u6784\u5982\u4e0b：<\/p>\n

\"\u5207\u7247\u6570\u636e\u7ed3\u6784\"<\/p>\n

\u6ce8\u610f，\u5e95\u5c42\u6570\u7ec4\u662f\u53ef\u4ee5\u88ab\u591a\u4e2a slice \u540c\u65f6\u6307\u5411\u7684，\u56e0\u6b64\u5bf9\u4e00\u4e2a slice \u7684\u5143\u7d20\u8fdb\u884c\u64cd\u4f5c\u662f\u6709\u53ef\u80fd\u5f71\u54cd\u5230\u5176\u4ed6 slice \u7684\u3002<\/p>\n

\u4e8c\u3001\u64cd\u4f5c<\/h3>\n

2.1\u521b\u5efa<\/h4>\n

src\/runtime\/slice.go \u4e3b\u8981\u903b\u8f91\u5c31\u662f\u57fa\u4e8e\u5bb9\u91cf\u7533\u8bf7\u5185\u5b58\u3002<\/p>\n

func<\/span> makeslice<\/span>(<\/span>et *<\/span>_type,<\/span> len<\/span>,<\/span> cap<\/span> int<\/span>)<\/span> unsafe.<\/span>Pointer {<\/span>
\n \/\/ \u8ba1\u7b97\u5207\u7247\u6240\u9700\u7684\u5185\u5b58\u5927\u5c0f，cap \u4e3a\u5207\u7247\u5bb9\u91cf，et.Size_ \u4e3a\u6bcf\u4e2a\u5143\u7d20\u7684\u5927\u5c0f<\/span>
\n \/\/ math.MulUintptr \u6267\u884c\u65e0\u7b26\u53f7\u6574\u6570\u4e58\u6cd5，\u5e76\u8fd4\u56de\u7ed3\u679c\u548c\u4e00\u4e2a\u8868\u793a\u662f\u5426\u53d1\u751f\u6ea2\u51fa\u7684\u5e03\u5c14\u503c<\/span>
\n mem,<\/span> overflow :=<\/span> math.<\/span>MulUintptr<\/span>(<\/span>et.<\/span>Size_,<\/span> uintptr<\/span>(<\/span>cap<\/span>)<\/span>)<\/span><\/p>\n

\/\/ \u68c0\u67e5\u4ee5\u4e0b\u51e0\u79cd\u9519\u8bef\u60c5\u51b5：<\/span>
\n \/\/ 1. overflow：\u5bb9\u91cf\u8ba1\u7b97\u65f6\u53d1\u751f\u6ea2\u51fa<\/span>
\n \/\/ 2. mem > maxAlloc：\u6240\u9700\u7684\u5185\u5b58\u8d85\u8fc7\u6700\u5927\u53ef\u5206\u914d\u5185\u5b58<\/span>
\n \/\/ 3. len < 0：\u5207\u7247\u957f\u5ea6\u4e3a\u8d1f\u6570<\/span>
\n \/\/ 4. len > cap：\u5207\u7247\u957f\u5ea6\u5927\u4e8e\u5bb9\u91cf<\/span>
\n if<\/span> overflow ||<\/span> mem ><\/span> maxAlloc ||<\/span> len<\/span> <<\/span> 0<\/span> ||<\/span> len<\/span> ><\/span> cap<\/span> {<\/span>
\n \/\/ \u6ce8\u610f：\u5f53\u7528\u6237\u6267\u884c make([]T, bignumber) \u65f6，\u4ea7\u751f "len out of range" \u9519\u8bef，\u800c\u4e0d\u662f "cap out of range" \u9519\u8bef\u3002<\/span>
\n \/\/ \u867d\u7136 "cap out of range" \u4e5f\u662f\u5bf9\u7684，\u4f46\u7531\u4e8e\u5bb9\u91cf\u662f\u9690\u5f0f\u63d0\u4f9b\u7684，\u56e0\u6b64\u63d0\u793a\u957f\u5ea6\u9519\u8bef\u66f4\u6e05\u6670\u3002<\/span>
\n \/\/ \u53c2\u8003：golang.org\/issue\/4085<\/span>
\n \/\/ \u91cd\u65b0\u8ba1\u7b97\u57fa\u4e8e\u957f\u5ea6\u7684\u5185\u5b58\u5927\u5c0f，\u4ee5\u4fbf\u5728\u5bb9\u91cf\u6ea2\u51fa\u65f6\u63d0\u4f9b\u66f4\u51c6\u786e\u7684\u9519\u8bef\u4fe1\u606f（\u4f8b\u5982 len \u4e5f\u6ea2\u51fa）<\/span>
\n mem,<\/span> overflow :=<\/span> math.<\/span>MulUintptr<\/span>(<\/span>et.<\/span>Size_,<\/span> uintptr<\/span>(<\/span>len<\/span>)<\/span>)<\/span>
\n \/\/ \u518d\u6b21\u68c0\u67e5\u6ea2\u51fa\u3001\u5185\u5b58\u8d85\u51fa\u9650\u5236\u4ee5\u53ca\u957f\u5ea6\u4e3a\u8d1f\u6570\u7684\u60c5\u51b5<\/span>
\n if<\/span> overflow ||<\/span> mem ><\/span> maxAlloc ||<\/span> len<\/span> <<\/span> 0<\/span> {<\/span>
\n panicmakeslicelen<\/span>(<\/span>)<\/span> \/\/ \u957f\u5ea6\u9519\u8bef，\u89e6\u53d1 panic<\/span>
\n }<\/span>
\n panicmakeslicecap<\/span>(<\/span>)<\/span> \/\/ \u5bb9\u91cf\u9519\u8bef，\u89e6\u53d1 panic<\/span>
\n }<\/span><\/p>\n

\/\/ \u8c03\u7528 mallocgc \u5206\u914d\u5185\u5b58\u3002<\/span>
\n \/\/ mallocgc \u662f Go \u8fd0\u884c\u65f6\u4e2d\u7684\u51fd\u6570，\u7528\u4e8e\u5206\u914d\u5185\u5b58\u5e76\u5728\u5783\u573e\u56de\u6536\u5668\u4e2d\u6ce8\u518c\u8be5\u5185\u5b58\u3002<\/span>
\n \/\/ \u53c2\u6570：<\/span>
\n \/\/ mem: \u8981\u5206\u914d\u7684\u5185\u5b58\u5927\u5c0f<\/span>
\n \/\/ et: \u5207\u7247\u5143\u7d20\u7684\u7c7b\u578b<\/span>
\n \/\/ true: \u6307\u793a\u5206\u914d\u7684\u5185\u5b58\u5e94\u8be5\u88ab\u6e05\u96f6<\/span>
\n return<\/span> mallocgc<\/span>(<\/span>mem,<\/span> et,<\/span> true<\/span>)<\/span>
\n}<\/span><\/p>\n

2.2\u6269\u5bb9<\/h4>\n

\u6838\u5fc3\u6e90\u7801 growslice-\u300bnextslicecap&&roundupsize<\/p>\n

\u9996\u5148\u901a\u8fc7nextslicecap\u8ba1\u7b97\u51fa\u4e00\u4e2a\u521d\u6b65\u7684\u6269\u5bb9\u503c，\u901a\u8fc7roundupsize\u5185\u5b58\u5bf9\u9f50\u5f97\u51fa\u6700\u7ec8\u7684\u6269\u5bb9\u503c，\u5e76\u4e0d\u662f\u7f51\u4e0a\u7684\u7b80\u5355\u516c\u5f0f\u3002<\/p>\n

\u57281.18\u7248\u672c\u4e4b\u524d，slice\u6e90\u7801\u4e2dnextslicecap\u6269\u5bb9\u4e3b\u8981\u903b\u8f91\u4e3a：<\/p>\n

\u5f53\u539f slice \u5bb9\u91cf\u5c0f\u4e8e 1024 \u7684\u65f6\u5019，\u65b0 slice \u5bb9\u91cf\u53d8\u6210\u539f\u6765\u7684 2 \u500d；\u539f slice \u5bb9\u91cf\u8d85\u8fc7 1024，\u65b0 slice \u5bb9\u91cf\u53d8\u6210\u539f\u6765\u76841.25\u500d\u3002<\/p>\n

\u57281.18\u7248\u672c\u66f4\u65b0\u4e4b\u540e，slice\u6e90\u7801\u4e2dnextslicecap\u7684\u6269\u5bb9\u4e3b\u8981\u903b\u8f91\u53d8\u4e3a\u4e86：<\/p>\n

\u5f53\u539fslice\u5bb9\u91cf(oldcap)\u5c0f\u4e8e256\u7684\u65f6\u5019，\u65b0slice(newcap)\u5bb9\u91cf\u4e3a\u539f\u6765\u76842\u500d；\u539fslice\u5bb9\u91cf\u8d85\u8fc7256，\u65b0slice\u5bb9\u91cfnewcap = oldcap+(oldcap+3*256)\/4<\/p>\n

\u4e0b\u8ff0\u4e3ago1.23\u6e90\u7801\u903b\u8f91src\/runtime\/slice.go ：<\/p>\n

\/\/ growslice \u4e3a\u4e00\u4e2a\u5207\u7247\u5206\u914d\u65b0\u7684\u5e95\u5c42\u5b58\u50a8\u3002<\/span>
\n\/\/<\/span>
\n\/\/ \u53c2\u6570:<\/span>
\n\/\/ oldPtr = \u6307\u5411\u5207\u7247\u5e95\u5c42\u6570\u7ec4\u7684\u6307\u9488<\/span>
\n\/\/ newLen = \u65b0\u7684\u957f\u5ea6（= oldLen + num）<\/span>
\n\/\/ oldCap = \u539f\u59cb\u5207\u7247\u7684\u5bb9\u91cf<\/span>
\n\/\/ num = \u6b63\u5728\u6dfb\u52a0\u7684\u5143\u7d20\u6570\u91cf<\/span>
\n\/\/ et = \u5143\u7d20\u7c7b\u578b<\/span>
\n\/\/ \u8fd4\u56de\u503c:<\/span>
\n\/\/ newPtr = \u6307\u5411\u65b0\u5e95\u5c42\u5b58\u50a8\u7684\u6307\u9488<\/span>
\n\/\/ newLen = \u65b0\u7684\u957f\u5ea6\u4e0e\u4f20\u53c2\u76f8\u540c<\/span>
\n\/\/ newCap = \u65b0\u5e95\u5c42\u5b58\u50a8\u7684\u5bb9\u91cf<\/span>
\n\/\/<\/span>
\n\/\/ \u8981\u6c42 uint(newLen) > uint(oldCap)\u3002<\/span>
\n\/\/ \u5047\u8bbe\u539f\u59cb\u5207\u7247\u7684\u957f\u5ea6\u4e3a newLen – num<\/span>
\n\/\/<\/span>
\n\/\/ \u5206\u914d\u4e00\u4e2a\u81f3\u5c11\u80fd\u5bb9\u7eb3 newLen \u4e2a\u5143\u7d20\u7684\u65b0\u5e95\u5c42\u5b58\u50a8\u3002<\/span>
\n\/\/ \u5df2\u5b58\u5728\u7684\u6761\u76ee [0, oldLen) \u88ab\u590d\u5236\u5230\u65b0\u7684\u5e95\u5c42\u5b58\u50a8\u4e2d\u3002<\/span>
\n\/\/ \u6dfb\u52a0\u7684\u6761\u76ee [oldLen, newLen) \u4e0d\u4f1a\u88ab growslice \u521d\u59cb\u5316<\/span>
\n\/\/ （\u867d\u7136\u5bf9\u4e8e\u5305\u542b\u6307\u9488\u7684\u5143\u7d20\u7c7b\u578b，\u5b83\u4eec\u4f1a\u88ab\u6e05\u96f6）\u3002\u8c03\u7528\u8005\u5fc5\u987b\u521d\u59cb\u5316\u8fd9\u4e9b\u6761\u76ee\u3002<\/span>
\n\/\/ \u5c3e\u968f\u6761\u76ee [newLen, newCap) \u88ab\u6e05\u96f6\u3002<\/span>
\n\/\/<\/span>
\n\/\/ growslice \u7684\u7279\u6b8a\u8c03\u7528\u7ea6\u5b9a\u4f7f\u5f97\u8c03\u7528\u6b64\u51fd\u6570\u7684\u751f\u6210\u4ee3\u7801\u66f4\u7b80\u5355\u3002\u7279\u522b\u662f，\u5b83\u63a5\u53d7\u5e76\u8fd4\u56de<\/span>
\n\/\/ \u65b0\u7684\u957f\u5ea6，\u8fd9\u6837\u65e7\u7684\u957f\u5ea6\u4e0d\u9700\u8981\u88ab\u4fdd\u7559\/\u6062\u590d，\u800c\u65b0\u7684\u957f\u5ea6\u8fd4\u56de\u65f6\u4e5f\u4e0d\u9700\u8981\u88ab\u4fdd\u7559\/\u6062\u590d\u3002<\/span>
\nfunc<\/span> growslice<\/span>(<\/span>oldPtr unsafe.<\/span>Pointer,<\/span> newLen,<\/span> oldCap,<\/span> num int<\/span>,<\/span> et *<\/span>_type)<\/span> slice {<\/span>
\n oldLen :=<\/span> newLen –<\/span> num
\n \/\/ … \u51fd\u6570\u975e\u6838\u5fc3\u90e8\u5206\u7701\u7565<\/span><\/p>\n

if<\/span> newLen <<\/span> 0<\/span> {<\/span>
\n panic<\/span>(<\/span>errorString<\/span>(<\/span>"growslice: len out of range"<\/span>)<\/span>)<\/span>
\n }<\/span><\/p>\n

if<\/span> et.<\/span>Size_ ==<\/span> 0<\/span> {<\/span>
\n \/\/ append\u4e0d\u5e94\u8be5\u521b\u5efa\u4e00\u4e2a\u6307\u9488\u4e3anil\u4f46\u957f\u5ea6\u975e\u96f6\u7684\u5207\u7247\u3002<\/span>
\n \/\/ \u6211\u4eec\u5047\u8bbe\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b，append\u4e0d\u9700\u8981\u4fdd\u7559oldPtr\u3002<\/span>
\n return<\/span> slice{<\/span>unsafe.<\/span>Pointer<\/span>(<\/span>&<\/span>zerobase)<\/span>,<\/span> newLen,<\/span> newLen}<\/span>
\n }<\/span><\/p>\n

\/\/ 1.\u8ba1\u7b97\u65b0\u5bb9\u91cf<\/span>
\n newcap :=<\/span> nextslicecap<\/span>(<\/span>newLen,<\/span> oldCap)<\/span><\/p>\n

var<\/span> overflow bool<\/span>
\n var<\/span> lenmem,<\/span> newlenmem,<\/span> capmem uintptr<\/span>
\n \/\/ \u9488\u5bf9\u5e38\u89c1\u7684 et.Size \u8fdb\u884c\u4f18\u5316<\/span>
\n \/\/ \u5bf9\u4e8e1\u6211\u4eec\u4e0d\u9700\u8981\u4efb\u4f55\u9664\u6cd5\/\u4e58\u6cd5\u3002<\/span>
\n \/\/ \u5bf9\u4e8e goarch.PtrSize, \u7f16\u8bd1\u5668\u4f1a\u4f18\u5316\u9664\u6cd5\/\u4e58\u6cd5\u4e3a\u4e00\u4e2a\u5e38\u91cf\u79fb\u4f4d\u3002<\/span>
\n \/\/ \u5bf9\u4e8e2\u7684\u5e42，\u4f7f\u7528\u53d8\u91cf\u79fb\u4f4d\u3002<\/span>
\n noscan :=<\/span> !<\/span>et.<\/span>Pointers<\/span>(<\/span>)<\/span>
\n \/\/ 2.\u5185\u5b58\u5bf9\u9f50<\/span>
\n switch<\/span> {<\/span>
\n case<\/span> et.<\/span>Size_ ==<\/span> 1<\/span>:<\/span>
\n lenmem =<\/span> uintptr<\/span>(<\/span>oldLen)<\/span>
\n newlenmem =<\/span> uintptr<\/span>(<\/span>newLen)<\/span>
\n capmem =<\/span> roundupsize<\/span>(<\/span>uintptr<\/span>(<\/span>newcap)<\/span>,<\/span> noscan)<\/span>
\n overflow =<\/span> uintptr<\/span>(<\/span>newcap)<\/span> ><\/span> maxAlloc
\n newcap =<\/span> int<\/span>(<\/span>capmem)<\/span>
\n case<\/span> et.<\/span>Size_ ==<\/span> goarch.<\/span>PtrSize:<\/span>
\n lenmem =<\/span> uintptr<\/span>(<\/span>oldLen)<\/span> *<\/span> goarch.<\/span>PtrSize
\n newlenmem =<\/span> uintptr<\/span>(<\/span>newLen)<\/span> *<\/span> goarch.<\/span>PtrSize
\n capmem =<\/span> roundupsize<\/span>(<\/span>uintptr<\/span>(<\/span>newcap)<\/span>*<\/span>goarch.<\/span>PtrSize,<\/span> noscan)<\/span>
\n overflow =<\/span> uintptr<\/span>(<\/span>newcap)<\/span> ><\/span> maxAlloc\/<\/span>goarch.<\/span>PtrSize
\n newcap =<\/span> int<\/span>(<\/span>capmem \/<\/span> goarch.<\/span>PtrSize)<\/span>
\n case<\/span> isPowerOfTwo<\/span>(<\/span>et.<\/span>Size_)<\/span>:<\/span>
\n var<\/span> shift uintptr<\/span>
\n if<\/span> goarch.<\/span>PtrSize ==<\/span> 8<\/span> {<\/span>
\n shift =<\/span> uintptr<\/span>(<\/span>sys.<\/span>TrailingZeros64<\/span>(<\/span>uint64<\/span>(<\/span>et.<\/span>Size_)<\/span>)<\/span>)<\/span> &<\/span> 63<\/span>
\n }<\/span> else<\/span> {<\/span>
\n shift =<\/span> uintptr<\/span>(<\/span>sys.<\/span>TrailingZeros32<\/span>(<\/span>uint32<\/span>(<\/span>et.<\/span>Size_)<\/span>)<\/span>)<\/span> &<\/span> 31<\/span>
\n }<\/span>
\n lenmem =<\/span> uintptr<\/span>(<\/span>oldLen)<\/span> <<<\/span> shift
\n newlenmem =<\/span> uintptr<\/span>(<\/span>newLen)<\/span> <<<\/span> shift
\n capmem =<\/span> roundupsize<\/span>(<\/span>uintptr<\/span>(<\/span>newcap)<\/span><<<\/span>shift,<\/span> noscan)<\/span>
\n overflow =<\/span> uintptr<\/span>(<\/span>newcap)<\/span> ><\/span> (<\/span>maxAlloc >><\/span> shift)<\/span>
\n newcap =<\/span> int<\/span>(<\/span>capmem >><\/span> shift)<\/span>
\n capmem =<\/span> uintptr<\/span>(<\/span>newcap)<\/span> <<<\/span> shift
\n default<\/span>:<\/span>
\n lenmem =<\/span> uintptr<\/span>(<\/span>oldLen)<\/span> *<\/span> et.<\/span>Size_
\n newlenmem =<\/span> uintptr<\/span>(<\/span>newLen)<\/span> *<\/span> et.<\/span>Size_
\n capmem,<\/span> overflow =<\/span> math.<\/span>MulUintptr<\/span>(<\/span>et.<\/span>Size_,<\/span> uintptr<\/span>(<\/span>newcap)<\/span>)<\/span>
\n capmem =<\/span> roundupsize<\/span>(<\/span>capmem,<\/span> noscan)<\/span>
\n newcap =<\/span> int<\/span>(<\/span>capmem \/<\/span> et.<\/span>Size_)<\/span>
\n capmem =<\/span> uintptr<\/span>(<\/span>newcap)<\/span> *<\/span> et.<\/span>Size_
\n }<\/span>
\n \/\/ … \u51fd\u6570\u975e\u6838\u5fc3\u90e8\u5206\u7701\u7565<\/span>
\n}<\/span><\/p>\n

\u6838\u5fc3\u4ee3\u7801:<\/span>
\n\/\/ nextslicecap \u8ba1\u7b97\u4e0b\u4e00\u4e2a\u5408\u9002\u7684\u5207\u7247\u5bb9\u91cf\u3002<\/span>
\n\/\/ \u8be5\u51fd\u6570\u7528\u4e8e\u5728\u5207\u7247\u9700\u8981\u6269\u5bb9\u65f6，\u786e\u5b9a\u65b0\u7684\u5bb9\u91cf\u5927\u5c0f\u3002<\/span>
\n\/\/ newLen: \u5207\u7247\u7684\u65b0\u957f\u5ea6（\u6240\u9700\u5bb9\u91cf）\u3002<\/span>
\n\/\/ oldCap: \u5207\u7247\u7684\u65e7\u5bb9\u91cf\u3002<\/span>
\n\/\/ \u8fd4\u56de\u503c: \u65b0\u7684\u5207\u7247\u5bb9\u91cf\u3002<\/span>
\nfunc<\/span> nextslicecap<\/span>(<\/span>newLen,<\/span> oldCap int<\/span>)<\/span> int<\/span> {<\/span>
\n newcap :=<\/span> oldCap \/\/ \u5c06\u65b0\u7684\u5bb9\u91cf\u521d\u59cb\u5316\u4e3a\u65e7\u7684\u5bb9\u91cf<\/span><\/p>\n

doublecap :=<\/span> newcap +<\/span> newcap \/\/ \u8ba1\u7b97\u65e7\u5bb9\u91cf\u7684\u4e24\u500d<\/span><\/p>\n

\/\/ \u5982\u679c\u65b0\u957f\u5ea6\u5927\u4e8e\u65e7\u5bb9\u91cf\u7684\u4e24\u500d，\u5219\u76f4\u63a5\u4f7f\u7528\u65b0\u957f\u5ea6\u4f5c\u4e3a\u65b0\u5bb9\u91cf<\/span>
\n \/\/ \u8fd9\u662f\u4e3a\u4e86\u907f\u514d\u9891\u7e41\u7684\u6269\u5bb9\u64cd\u4f5c，\u5f53\u6240\u9700\u957f\u5ea6\u8fdc\u5927\u4e8e\u5f53\u524d\u5bb9\u91cf\u65f6，\u76f4\u63a5\u5206\u914d\u6240\u9700\u7684\u7a7a\u95f4<\/span>
\n if<\/span> newLen ><\/span> doublecap {<\/span>
\n return<\/span> newLen
\n }<\/span><\/p>\n

\/\/ \u8bbe\u7f6e\u4e00\u4e2a\u9608\u503c，\u7528\u4e8e\u533a\u5206\u5c0f\u5207\u7247\u548c\u5927\u5207\u7247<\/span>
\n const<\/span> threshold =<\/span> 256<\/span><\/p>\n

\/\/ \u5bf9\u4e8e\u5bb9\u91cf\u5c0f\u4e8e\u9608\u503c\u7684\u5c0f\u5207\u7247，\u65b0\u5bb9\u91cf\u76f4\u63a5\u8bbe\u7f6e\u4e3a\u65e7\u5bb9\u91cf\u7684\u4e24\u500d<\/span>
\n \/\/ \u8fd9\u662f\u56e0\u4e3a\u5c0f\u5207\u7247\u7684\u6269\u5bb9\u6210\u672c\u76f8\u5bf9\u8f83\u4f4e<\/span>
\n if<\/span> oldCap <<\/span> threshold {<\/span>
\n return<\/span> doublecap
\n }<\/span><\/p>\n

\/\/ \u5bf9\u4e8e\u5bb9\u91cf\u5927\u4e8e\u7b49\u4e8e\u9608\u503c\u7684\u5927\u5207\u7247，\u91c7\u7528\u66f4\u4fdd\u5b88\u7684\u6269\u5bb9\u7b56\u7565<\/span>
\n for<\/span> {<\/span>
\n \/\/ \u4ece2\u500d\u589e\u957f（\u5c0f\u5207\u7247）\u8fc7\u6e21\u52301.25\u500d\u589e\u957f（\u5927\u5207\u7247）\u3002<\/span>
\n \/\/ \u8be5\u516c\u5f0f\u5728\u4e24\u8005\u4e4b\u95f4\u63d0\u4f9b\u5e73\u6ed1\u7684\u8fc7\u6e21\u3002<\/span>
\n \/\/ (newcap + 3*threshold) >> 2 \u7b49\u4ef7\u4e8e (newcap + 3*threshold) \/ 4<\/span>
\n \/\/ \u8fd9\u4f7f\u5f97\u65b0\u5bb9\u91cf\u7684\u589e\u957f\u6bd4\u4f8b\u57281.25\u52302\u4e4b\u95f4，\u5e76\u968f\u7740\u5207\u7247\u5bb9\u91cf\u7684\u589e\u5927\u800c\u9010\u6e10\u63a5\u8fd11.25<\/span>
\n newcap +=<\/span> (<\/span>newcap +<\/span> 3<\/span>*<\/span>threshold)<\/span> >><\/span> 2<\/span><\/p>\n

\/\/ \u9700\u8981\u68c0\u67e5 `newcap >= newLen` \u4ee5\u53ca `newcap` \u662f\u5426\u6ea2\u51fa\u3002<\/span>
\n \/\/ newLen \u4fdd\u8bc1\u5927\u4e8e\u96f6，\u56e0\u6b64\u5f53 newcap \u6ea2\u51fa\u65f6，`uint(newcap) > uint(newLen)` \u4e0d\u6210\u7acb\u3002<\/span>
\n \/\/ \u8fd9\u5141\u8bb8\u4f7f\u7528\u76f8\u540c\u7684\u6bd4\u8f83\u6765\u68c0\u67e5\u4e24\u8005\u3002<\/span>
\n \/\/ \u4f7f\u7528uint\u7c7b\u578b\u8fdb\u884c\u6bd4\u8f83\u662f\u4e3a\u4e86\u5904\u7406\u6ea2\u51fa\u60c5\u51b5\u3002\u5982\u679cnewcap\u6ea2\u51fa\u53d8\u6210\u8d1f\u6570，\u8f6c\u6362\u4e3auint\u7c7b\u578b\u540e\u4f1a\u53d8\u6210\u4e00\u4e2a\u5f88\u5927\u7684\u6b63\u6570，\u4ece\u800c\u4f7f\u5f97\u6bd4\u8f83\u4ecd\u7136\u6709\u6548\u3002<\/span>
\n if<\/span> uint<\/span>(<\/span>newcap)<\/span> >=<\/span> uint<\/span>(<\/span>newLen)<\/span> {<\/span>
\n break<\/span> \/\/ \u5982\u679c\u65b0\u5bb9\u91cf\u8db3\u591f\u5927，\u5219\u9000\u51fa\u5faa\u73af<\/span>
\n }<\/span>
\n }<\/span><\/p>\n

\/\/ \u5f53 newcap \u8ba1\u7b97\u6ea2\u51fa\u65f6，\u5c06 newcap \u8bbe\u7f6e\u4e3a\u8bf7\u6c42\u7684\u5bb9\u91cf\u3002<\/span>
\n \/\/ \u5982\u679c newcap \u5c0f\u4e8e\u7b49\u4e8e 0，\u8bf4\u660e\u53d1\u751f\u4e86\u6ea2\u51fa<\/span>
\n if<\/span> newcap <=<\/span> 0<\/span> {<\/span>
\n return<\/span> newLen
\n }<\/span>
\n return<\/span> newcap \/\/ \u8fd4\u56de\u8ba1\u7b97\u51fa\u7684\u65b0\u5bb9\u91cf<\/span>
\n}<\/span><\/p>\n

\/\/ roundupsize \u8fd4\u56de mallocgc \u4e3a\u6307\u5b9a\u5927\u5c0f\u5206\u914d\u7684\u5185\u5b58\u5757\u7684\u5927\u5c0f，\u51cf\u53bb\u4efb\u4f55\u7528\u4e8e\u5143\u6570\u636e\u7684\u5185\u8054\u7a7a\u95f4\u3002<\/span>
\n\/\/ size: \u8bf7\u6c42\u5206\u914d\u7684\u5185\u5b58\u5927\u5c0f\u3002<\/span>
\n\/\/ noscan: \u5982\u679c\u4e3a true，\u5219\u8868\u793a\u8be5\u5185\u5b58\u5757\u4e0d\u9700\u8981\u5783\u573e\u56de\u6536\u626b\u63cf\u3002<\/span>
\n\/\/ \u8fd4\u56de\u503c: mallocgc \u5b9e\u9645\u5206\u914d\u7684\u5185\u5b58\u5757\u5927\u5c0f\u3002<\/span>
\nfunc<\/span> roundupsize<\/span>(<\/span>size uintptr<\/span>,<\/span> noscan bool<\/span>)<\/span> (<\/span>reqSize uintptr<\/span>)<\/span> {<\/span>
\n reqSize =<\/span> size \/\/ \u521d\u59cb\u5316\u8bf7\u6c42\u5927\u5c0f<\/span><\/p>\n

\/\/ \u5904\u7406\u5c0f\u5bf9\u8c61（\u5c0f\u4e8e\u7b49\u4e8e maxSmallSize-mallocHeaderSize）<\/span>
\n if<\/span> reqSize <=<\/span> maxSmallSize–<\/span>mallocHeaderSize {<\/span>
\n \/\/ \u5c0f\u5bf9\u8c61\u3002<\/span>
\n \/\/ \u5982\u679c\u9700\u8981\u5783\u573e\u56de\u6536\u626b\u63cf (noscan \u4e3a false) \u5e76\u4e14\u5927\u5c0f\u5927\u4e8e minSizeForMallocHeader，\u5219\u6dfb\u52a0 mallocHeaderSize \u7528\u4e8e\u5b58\u50a8\u5143\u6570\u636e\u3002<\/span>
\n \/\/ heapBitsInSpan(reqSize) \u7528\u4e8e\u68c0\u67e5\u5bf9\u8c61\u662f\u5426\u8db3\u591f\u5c0f\u5230\u53ef\u4ee5\u5b58\u50a8\u5728\u5806\u7684\u4f4d\u56fe\u4e2d，\u5982\u679c\u53ef\u4ee5，\u5219\u4e0d\u9700\u8981 mallocHeader\u3002<\/span>
\n if<\/span> !<\/span>noscan &&<\/span> reqSize ><\/span> minSizeForMallocHeader {<\/span> \/\/ !noscan && !heapBitsInSpan(reqSize)<\/span>
\n reqSize +=<\/span> mallocHeaderSize
\n }<\/span><\/p>\n

\/\/ (reqSize – size) \u4e3a mallocHeaderSize \u6216 0\u3002\u5982\u679c\u6dfb\u52a0\u4e86 mallocHeaderSize，\u6211\u4eec\u9700\u8981\u4ece\u7ed3\u679c\u4e2d\u51cf\u53bb\u5b83，\u56e0\u4e3a mallocgc \u4f1a\u518d\u6b21\u6dfb\u52a0\u5b83\u3002<\/span>
\n \/\/ \u8fd9\u91cc\u662f\u4e3a\u4e86\u786e\u4fdd\u8fd4\u56de\u7684\u5927\u5c0f\u662f mallocgc \u5b9e\u9645\u5206\u914d\u7684\u5927\u5c0f，\u800c\u4e0d\u662f\u5305\u542b\u4e86\u5934\u90e8\u4e4b\u540e\u7684\u5927\u5c0f\u3002<\/span><\/p>\n

\/\/ \u8fdb\u4e00\u6b65\u533a\u5206\u66f4\u5c0f\u7684\u5bf9\u8c61\u548c\u4e2d\u7b49\u5927\u5c0f\u7684\u5bf9\u8c61，\u4f7f\u7528\u4e0d\u540c\u7684\u67e5\u627e\u8868\u8fdb\u884c\u5411\u4e0a\u53d6\u6574<\/span>
\n if<\/span> reqSize <=<\/span> smallSizeMax–<\/span>8<\/span> {<\/span>
\n \/\/ \u5bf9\u4e8e\u975e\u5e38\u5c0f\u7684\u5bf9\u8c61，\u4f7f\u7528 size_to_class8 \u548c class_to_size \u67e5\u627e\u8868\u8fdb\u884c\u5411\u4e0a\u53d6\u6574，\u4ee5 8 \u5b57\u8282\u4e3a\u7c92\u5ea6\u3002<\/span>
\n \/\/ divRoundUp(reqSize, smallSizeDiv) \u8ba1\u7b97 reqSize \u5728 smallSizeDiv \u7c92\u5ea6\u4e0b\u7684\u5411\u4e0a\u53d6\u6574\u503c\u3002<\/span>
\n \/\/ class_to_size[…] \u83b7\u53d6\u5bf9\u5e94\u5927\u5c0f\u7c7b\u7684\u5b9e\u9645\u5206\u914d\u5927\u5c0f\u3002<\/span>
\n \/\/ \u6700\u540e\u51cf\u53bb (reqSize – size) \u79fb\u9664\u4e4b\u524d\u53ef\u80fd\u6dfb\u52a0\u7684 mallocHeaderSize\u3002<\/span>
\n return<\/span> uintptr<\/span>(<\/span>class_to_size[<\/span>size_to_class8[<\/span>divRoundUp<\/span>(<\/span>reqSize,<\/span> smallSizeDiv)<\/span>]<\/span>]<\/span>)<\/span> –<\/span> (<\/span>reqSize –<\/span> size)<\/span>
\n }<\/span>
\n \/\/ \u5bf9\u4e8e\u4e2d\u7b49\u5927\u5c0f\u7684\u5bf9\u8c61，\u4f7f\u7528 size_to_class128 \u548c class_to_size \u67e5\u627e\u8868\u8fdb\u884c\u5411\u4e0a\u53d6\u6574，\u4ee5 128 \u5b57\u8282\u4e3a\u7c92\u5ea6\u3002<\/span>
\n return<\/span> uintptr<\/span>(<\/span>class_to_size[<\/span>size_to_class128[<\/span>divRoundUp<\/span>(<\/span>reqSize–<\/span>smallSizeMax,<\/span> largeSizeDiv)<\/span>]<\/span>]<\/span>)<\/span> –<\/span> (<\/span>reqSize –<\/span> size)<\/span>
\n }<\/span><\/p>\n

\/\/ \u5904\u7406\u5927\u5bf9\u8c61（\u5927\u4e8e maxSmallSize-mallocHeaderSize）<\/span>
\n \/\/ \u5927\u5bf9\u8c61\u3002\u5c06 reqSize \u5411\u4e0a\u5bf9\u9f50\u5230\u4e0b\u4e00\u9875\u3002\u68c0\u67e5\u6ea2\u51fa\u3002<\/span>
\n reqSize +=<\/span> pageSize –<\/span> 1<\/span> \/\/ \u5c06 reqSize \u589e\u52a0\u5230\u4e0b\u4e00\u9875\u8fb9\u754c\u4e4b\u524d<\/span><\/p>\n

\/\/ \u68c0\u67e5\u6ea2\u51fa\u3002\u5982\u679c reqSize \u52a0\u4e0a pageSize – 1 \u540e\u53cd\u800c\u53d8\u5c0f\u4e86，\u8bf4\u660e\u53d1\u751f\u4e86\u6ea2\u51fa\u3002<\/span>
\n if<\/span> reqSize <<\/span> size {<\/span>
\n return<\/span> size \/\/ \u8fd4\u56de\u539f\u59cb\u5927\u5c0f，\u907f\u514d\u5206\u914d\u8fc7\u5927\u7684\u5185\u5b58<\/span>
\n }<\/span><\/p>\n

\/\/ \u901a\u8fc7\u6309\u4f4d\u4e0e\u8fd0\u7b97\u5c06 reqSize \u5bf9\u9f50\u5230\u4e0b\u4e00\u9875\u8fb9\u754c\u3002<\/span>
\n return<\/span> reqSize &^<\/span> (<\/span>pageSize –<\/span> 1<\/span>)<\/span>
\n}<\/span><\/p>\n

\u4e09\u3001\u95ee\u9898<\/h3>\n

\u3010\u5f15\u75331\u3011 [3]int \u548c [4]int \u662f\u540c\u4e00\u4e2a\u7c7b\u578b\u5417？<\/p>\n

\u4e0d\u662f\u3002\u56e0\u4e3a\u6570\u7ec4\u7684\u957f\u5ea6\u662f\u7c7b\u578b\u7684\u4e00\u90e8\u5206，\u8fd9\u662f\u4e0e slice \u4e0d\u540c\u7684\u4e00\u70b9\u3002<\/p>\n

\u3010\u5f15\u75332\u3011 \u4e0b\u9762\u7684\u4ee3\u7801\u8f93\u51fa\u662f\u4ec0\u4e48？<\/p>\n

\u8bf4\u660e：\u4f8b\u5b50\u6765\u81ea\u96e8\u75d5\u5927\u4f6c\u300aGo\u5b66\u4e60\u7b14\u8bb0\u300b\u7b2c\u56db\u7248，P43\u9875\u3002\u8fd9\u91cc\u6211\u4f1a\u8fdb\u884c\u6269\u5c55，\u5e76\u4f1a\u4f5c\u56fe\u8be6\u7ec6\u5206\u6790\u3002<\/p>\n

package main<\/p>\n

import "fmt"<\/p>\n

func main() {
\nslice := []int{0, 1, 2, 3, 4, 5, 6, 7, 8, 9}
\ns1 := slice[2:5]
\ns2 := s1[2:6:7]<\/p>\n

s2 = append(s2, 100)
\ns2 = append(s2, 200)<\/p>\n

s1[2] = 20<\/p>\n

fmt.Println(s1)
\nfmt.Println(s2)
\nfmt.Println(slice)
\n}<\/p>\n

\u7ed3\u679c：<\/p>\n

[2 3 20]
\n[4 5 6 7 100 200]
\n[0 1 2 3 20 5 6 7 100 9]<\/p>\n

s1 \u4ece slice \u7d22\u5f152（\u95ed\u533a\u95f4）\u5230\u7d22\u5f155（\u5f00\u533a\u95f4，\u5143\u7d20\u771f\u6b63\u53d6\u5230\u7d22\u5f154），\u957f\u5ea6\u4e3a3，\u5bb9\u91cf\u9ed8\u8ba4\u5230\u6570\u7ec4\u7ed3\u5c3e，\u4e3a8\u3002 s2 \u4ece s1 \u7684\u7d22\u5f152（\u95ed\u533a\u95f4）\u5230\u7d22\u5f156（\u5f00\u533a\u95f4，\u5143\u7d20\u771f\u6b63\u53d6\u5230\u7d22\u5f155），\u5bb9\u91cf\u5230\u7d22\u5f157（\u5f00\u533a\u95f4，\u771f\u6b63\u5230\u7d22\u5f156），\u4e3a5\u3002<\/p>\n

\"slice<\/p>\n

\u63a5\u7740，\u5411 s2 \u5c3e\u90e8\u8ffd\u52a0\u4e00\u4e2a\u5143\u7d20 100：<\/p>\n

s2 =<\/span> append<\/span>(<\/span>s2,<\/span> 100<\/span>)<\/span> <\/p>\n

s2 \u5bb9\u91cf\u521a\u597d\u591f，\u76f4\u63a5\u8ffd\u52a0\u3002\u4e0d\u8fc7，\u8fd9\u4f1a\u4fee\u6539\u539f\u59cb\u6570\u7ec4\u5bf9\u5e94\u4f4d\u7f6e\u7684\u5143\u7d20\u3002\u8fd9\u4e00\u6539\u52a8，\u6570\u7ec4\u548c s1 \u90fd\u53ef\u4ee5\u770b\u5f97\u5230\u3002<\/p>\n

\"append<\/p>\n

\u518d\u6b21\u5411 s2 \u8ffd\u52a0\u5143\u7d20200：<\/p>\n

s2 =<\/span> append<\/span>(<\/span>s2,<\/span> 200<\/span>)<\/span> <\/p>\n

\u8fd9\u65f6，s2 \u7684\u5bb9\u91cf\u4e0d\u591f\u7528，\u8be5\u6269\u5bb9\u4e86\u3002\u4e8e\u662f，s2 \u53e6\u8d77\u7089\u7076，\u5c06\u539f\u6765\u7684\u5143\u7d20\u590d\u5236\u65b0\u7684\u4f4d\u7f6e，\u6269\u5927\u81ea\u5df1\u7684\u5bb9\u91cf\u3002\u5e76\u4e14\u4e3a\u4e86\u5e94\u5bf9\u672a\u6765\u53ef\u80fd\u7684 append \u5e26\u6765\u7684\u518d\u4e00\u6b21\u6269\u5bb9，s2 \u4f1a\u5728\u6b64\u6b21\u6269\u5bb9\u7684\u65f6\u5019\u591a\u7559\u4e00\u4e9b buffer，\u5c06\u65b0\u7684\u5bb9\u91cf\u5c06\u6269\u5927\u4e3a\u539f\u59cb\u5bb9\u91cf\u76842\u500d，\u4e5f\u5c31\u662f10\u4e86\u3002<\/p>\n

\"append<\/p>\n

\u6700\u540e，\u4fee\u6539 s1 \u7d22\u5f15\u4e3a2\u4f4d\u7f6e\u7684\u5143\u7d20：<\/p>\n

s1[<\/span>2<\/span>]<\/span> =<\/span> 20<\/span><\/p>\n

\u8fd9\u6b21\u53ea\u4f1a\u5f71\u54cd\u539f\u59cb\u6570\u7ec4\u76f8\u5e94\u4f4d\u7f6e\u7684\u5143\u7d20\u3002\u5b83\u5f71\u54cd\u4e0d\u5230 s2 \u4e86，\u4eba\u5bb6\u5df2\u7ecf\u8fdc\u8d70\u9ad8\u98de\u4e86\u3002<\/p>\n

\"s1[2]=20\"<\/p>\n

\u518d\u63d0\u4e00\u70b9，\u6253\u5370 s1 \u7684\u65f6\u5019，\u53ea\u4f1a\u6253\u5370\u51fa s1 \u957f\u5ea6\u4ee5\u5185\u7684\u5143\u7d20\u3002\u6240\u4ee5，\u53ea\u4f1a\u6253\u5370\u51fa3\u4e2a\u5143\u7d20，\u867d\u7136\u5b83\u7684\u5e95\u5c42\u6570\u7ec4\u4e0d\u6b623\u4e2a\u5143\u7d20\u3002<\/p>\n

\u53c2\u8003\u94fe\u63a5<\/h3>\n

1.Go \u7a0b\u5e8f\u5458\u9762\u8bd5\u7b14\u8bd5\u5b9d\u5178<\/p>\n

2.\u300aGo\u5b66\u4e60\u7b14\u8bb0\u300b<\/p>\n

3.golangSlice\u7684\u6269\u5bb9\u89c4\u5219<\/p>\n","protected":false},"excerpt":{"rendered":"

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