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<a href="00851.html" target="topic">第二十七章 直接编程接口（DPI）</a>, <a href="00977.html" target="topic">主题</a></div>
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27.2 Two layers of the DPI</div>
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DPI consists of two separate layers: the SystemVerilog layer and a foreign language layer. The SystemVerilog layer does not depend on which programming language is actually used as the foreign language. Although different programming languages can be supported and used with the intact SystemVerilog layer, SystemVerilog 3.1 defines a foreign language layer only for the C programming language. Nevertheless, SystemVerilog code shall look identical and its semantics shall be unchanged for any foreign language layer. Different foreign languages can require that the SystemVerilog implementation shall use the appropriate function call protocol, argument passing and linking mechanisms. This shall be, however, transparent to SystemVerilog users. SystemVerilog 3.1 requires only that its implementation shall support C protocols and linkage.</p></div>
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<a href="00301.html" target="topic">27.2.1 DPI SystemVerilog layer</a> </div></td><td class="Element206" valign="top" width="50%">
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The SystemVerilog side of DPI does not depend on the foreign programming language. In particular, the actual function call protocol and argument passing mechanisms used in the foreign language are transparent and irrelevant to SystemVerilog. SystemVerilog code shall look identical regardless of what code the foreign side of the interface is using. The semantics of the SystemVerilog side of the interface is independent from the foreign side of the interface.<br><br>This chapter does not constitute a complete interface specification. It only describes the functionality, semantics and syntax of the SystemVerilog layer of the interface. The other half of the interface,... <a href="00301.html" target="topic">more</a> </div></td></tr><tr>
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The foreign language layer of the interface (which is transparent to SystemVerilog) shall specify how actual arguments are passed, how they can be accessed from the foreign code, how SystemVerilog-specific data types (such as logic and packed) are represented, and how to translate them to and from some predefined C-like types.<br><br>The data types allowed for formal arguments and results of imported functions or exported functions are generally SystemVerilog types (with some restrictions and with notational extensions for open arrays). The user is responsible for specifying in their foreign code the native types equivalent to the SystemVerilog types used in... <a href="00302.html" target="topic">more</a> </div></td></tr></table></div></div>
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