📄 00444.html
字号:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Frameset//EN">
<html>
<head>
<title>30.8.5 Sample code using object (and traverse) collections</title>
<meta http-equiv="Content-Type" content="text/html; charset=GB2312" />
<meta name="generator" content="Doc-O-Matic" />
<meta http-equiv="Content-Style-Type" content="text/css" />
<link rel="STYLESHEET" href="default.css" type="text/css" />
<script type="text/javascript" src="scripts.js"></script>
</head>
<body class="Element700" onload="onBodyLoadEx('systemverilog31a.html', 'topic', '00444.html');" onmousedown="onBodyMouseDown();">
<!-- Begin Popups -->
<div class="Element801" id="popup00582">
<div class="Element800">
<div class="Element14">
链接</div>
<div class="Element11">
<div class="Element10">
<a href="00434.html" target="topic">30.8 Reading data</a></div>
</div>
</div>
</div>
<!-- End Popups -->
<!-- Begin Page Header -->
<div class="Element710" id="areafixed">
<div class="Element92">
<table width="100%" cellspacing="0" cellpadding="0">
<tr><td width="33%">
<div class="Element1">
<a href="#" onmousedown="showPopup(this, 'popup00582');"><img src="seealsolink.png" border="0" alt="" title=""></a> SystemVerilog 3.1a语言参考手册</div>
</td><td width="34%">
<div class="Element2">
</div>
</td><td width="33%">
<div class="Element90">
<a href="00443.html" target="topic"><img src="btn_prev_lightblue.gif" border="0" alt="Previous" title="Previous" onmouseover="switchImage(this, 'btn_prev_lightblue_hover.gif');" onmouseout="switchImage(this, 'btn_prev_lightblue.gif');"></a><a href="00434.html" target="topic"><img src="btn_up_lightblue.gif" border="0" alt="Up" title="Up" onmouseover="switchImage(this, 'btn_up_lightblue_hover.gif');" onmouseout="switchImage(this, 'btn_up_lightblue.gif');"></a><a href="00445.html" target="topic"><img src="btn_next_lightblue.gif" border="0" alt="Next" title="Next" onmouseover="switchImage(this, 'btn_next_lightblue_hover.gif');" onmouseout="switchImage(this, 'btn_next_lightblue.gif');"></a></div>
</td></tr></table><div class="Element5">
30.8.5 Sample code using object (and traverse) collections</div>
</div>
</div>
<!-- End Page Header -->
<!-- Begin Client Area -->
<div class="Element720" id="areascroll">
<div class="Element721">
<!-- Begin Page Content -->
<div class="Element58">
<a name="描述"></a><div class="Element11">
<div class="Element10">
<div class="Element170">
<a href="#" onclick="CopyElementToClipboard('code01048');">Copy Code</a></div>
<div class="Element13"><div class="Element12" id="code01048"><pre class="Element12">p_vpi_extension reader; /* Pointer to reader VPI library */
vpiHandle scope; /* Some scope being looked at */
vpiHandle var_handle; /* Object handle */
vpiHandle some_net; /* Handle of some net */
vpiHandle some_reg; /* Handle of some reg */
vpiHandle vc_trvs_hdl1; /* Traverse handle */
vpiHandle vc_trvs_hdl2; /* Traverse handle */
vpiHandle itr; /* Iterator */
vpiHandle objCollection; /* Object collection */
vpiHandle trvsCollection; /* Traverse collection */
PLI_BYTE8 *data = “my_database”;/* database */
p_vpi_time time_p; /* time */
PLI_INT32 code; /* Return code */
/* Initialize the read interface: Post process mode, read from a database */
/* NOTE: Uses “toolX” library */
reader_p = vpi_load_extension(“toolX”, data, vpiAccessPostProcess);
if (reader_p == NULL) ... ; /* Not successful */
/* Get the scope using its name */
scope = reader_p->vpi_handle_by_name(“top.m1.s1”, NULL);
/* Create object collection */
objCollection = reader_p->vpi_create(vpiObjCollection, NULL, NULL);
/* Add data to collection: All the nets in scope */
/* ASSUMPTION: (waveform) tool “toolX” supports this navigation
relationship */
itr = reader_p->vpi_iterate(vpiNet, scope);
while (var_handle = reader_p->vpi_scan(itr)) {
objCollection = reader_p->vpi_create(vpiObjCollection, objCollection,
var_handle);
}
/* Add data to collection: All the regs in scope */
/* ASSUMPTION: (waveform) tool supports this navigation relationship */
itr = reader_p->vpi_iterate(vpiReg, scope);
while (var_handle = reader_p->vpi_scan(itr)) {
objCollection = reader_p->vpi_create(vpiObjCollection, objCollection,
var_handle);
}
/* Initialize the load: focus only on the signals in the object collection:
objCollection */
reader_p->vpi_load_init(objCollection, NULL, 0);
/* Demo scanning the object collection */
itr = reader_p->vpi_iterate(vpiMember, objCollection);
while (var_handle = reader_p->vpi_scan(itr)) {
...
}
/* Application code here */
some_net = ...;
time_p = ...;
some_reg = ...;
....
vc_trvs_hdl1 = reader_p->vpi_handle(vpiTrvsObj, some_net);
vc_trvs_hdl2 = reader_p->vpi_handle(vpiTrvsObj, some_reg);
vc_trvs_hdl1 = reader_p->vpi_goto(vpiTime, vc_trvs_hdl1, time_p, &code);
vc_trvs_hdl2 = reader_p->vpi_goto(vpiTime, vc_trvs_hdl2, time_p, &code);
/* Data querying and processing here */
....
/* free handles*/
reader_p->vpi_free_object(...);
/* close database */
reader_p->vpi_close(0, vpiAccessPostProcess, data);</pre></div></div>
<p class="Element10">
The code segment above initializes the read interface for post process read access from database data. It then creates an object collection objCollection then adds to it all the objects in scope of type vpiNet and vpiReg (assuming this type of navigation is allowed in the tool). Load access is initialized and set to the objects listed in objCollection. objCollection can be iterated using vpi_iterate() to create the iterator and then using vpi_scan() to scan it assuming here that the waveform tool provides this navigation. The application code is then free to obtain traverse handles for the objects, and perform its querying and data processing as it desires. </p>
<p class="Element10">
</p>
<p class="Element10">
The code segment below shows a simple code segment that mimics the function of a $dumpvars call to access data of all the regs in a specific scope and its subscopes and process the data. </p><div class="Element170">
<a href="#" onclick="CopyElementToClipboard('code01049');">Copy Code</a></div>
<div class="Element13"><div class="Element12" id="code01049"><pre class="Element12">p_vpi_extension reader_p; /* Reader library pointer */
vpiHandle big_scope; /* Some scope being looked at */
vpiHandle obj_handle; /* Object handle */
vpiHandle obj_trvs_hdl; /* Traverse handle */
vpiHandle signal_iterator; /* Iterator for signals */
p_vpi_time time_p; /* time */
/* Initialize the read interface: Access data from simulator */
/* NOTE: Use built-in VPI (e.g. that of simulator application is running
under */
reader_p = vpi_load_extension(NULL, NULL, vpiAccessLimitedInteractive);
if (reader_p == NULL) ... ; /* Not successful */
/* Initialize the load access: data from (simulator) memory, for scope
big_scope and its subscopes */
/* NOTE: Call marks load access */
vpi_load_init(NULL, big_scope, 0);
/* Application code here */
/* Obtain handle for all the regs in scope */
signal_iterator = vpi_iterate(vpiReg, big_scope);
/* Data querying and processing here */
while ( (obj_handle = vpi_scan(signal_iterator)) != NULL ) {
assert(vpi_get(vpiType, obj_handle) == vpiReg);
/* Create a traverse handle for read queries */
obj_trvs_hdl = vpi_handle(vpiTrvsObj, obj_handle);
time_p = ...; /* some time */
obj_trvs_hdl = vpi_goto(vpiTime, obj_trvs_hdl, time_p, &code);
/* Get info at time */
vpi_get_value(obj_trvs_hdl, value_p); /* Value */
vpi_printf(“....”);
}
/* free handles*/
vpi_free_object(...);</pre></div></div>
</div>
</div>
<a name="Group"></a><div class="Element14">
<a onclick="toggleVisibilityStored('Group');" class="a_Element14"><img src="sectionminus.png" border="0" alt="" title="" id="imgGroup">Group</a></div>
<div id="divGroup">
<div class="Element11">
<div class="Element10">
<p class="Element10">
<a href="00434.html" target="topic">30.8 Reading data</a></p></div>
</div>
</div>
<a name="Links"></a><div class="Element14">
<a onclick="toggleVisibilityStored('链接');" class="a_Element14"><img src="sectionminus.png" border="0" alt="" title="" id="img链接">链接</a></div>
<div id="div链接">
<div class="Element11">
<div class="Element10">
<a href="00434.html" target="topic">30.8 Reading data</a></div>
</div>
</div>
</div>
<!-- End Page Content -->
<!-- Begin Page Footer -->
<hr width="98%" align="center" size="1" color="#CCCCCC" />
<table align="center" cellpadding="0" cellspacing="0" border="0">
<tbody>
<tr height="10">
<td></td>
</tr>
<tr align="center">
<td>
<script type="text/javascript"><!--
google_ad_client = "pub-5266859600380184";
google_ad_width = 468;
google_ad_height = 60;
google_ad_format = "468x60_as";
google_ad_type = "text_image";
google_ad_channel ="";
google_page_url = document.location;
//--></script>
<script type="text/javascript"
src="http://pagead2.googlesyndication.com/pagead/show_ads.js">
</script>
</td>
</tr>
<tr height="15">
<td></td>
</tr>
<tr align="center">
<td>
<font size=2>除非特别声明，原文版权归作者所有，如有转摘请注明原作者以及译者（<a href="http://www.fpgatech.net/" target="_blank">FPGA技术网</a>）信息。<br />
如果您对本主题有何建议或意见，请登陆<a href="http://www.fpgatech.net/forum/forumdisplay.php?fid=18" target="_blank">FPGA开发者家园</a>提交，您的参与是我们前进的动力。</font>
<script language="javascript" type="text/javascript" src="http://js.users.51.la/195685.js"></script>
<noscript><a href="http://www.51.la/?195685" target="_blank"><img alt="我要啦免费统计" src="http://img.users.51.la/195685.asp" style="border:none" /></a></noscript>
</td>
</tr>
</tbody>
</table>
<!-- End Page Footer -->
</div>
</div>
<!-- End Client Area -->
</body></html>⌨️ 快捷键说明
复制代码
Ctrl + C
搜索代码
Ctrl + F
全屏模式
F11
切换主题
Ctrl + Shift + D
显示快捷键
?
增大字号
Ctrl + =
减小字号
Ctrl + -