Editing Verilog (section)

==Program Language Interface (PLI)==
The PLI provides a programmer with a mechanism to transfer control from Verilog to a program function written in C language. It is officially [[deprecated]] by IEEE Std 1364-2005 in favor of the newer [[Verilog Procedural Interface]], which completely replaces the PLI.

The PLI (now VPI) enables Verilog to cooperate with other programs written in the C language such as [[test harness]]es, [[instruction set simulator]]s of a [[microcontroller]], [[debugger]]s, and so on. For example, it provides the C functions <code>tf_putlongp()</code> <ref>{{cite web| url=https://perso.telecom-paristech.fr/guilley/ENS/20171205/TP/tp_syn/doc/IEEE_verilogHDL_1364-2001.pdf#page=652 |title=IEEE Standard Verilog® Hardware Description Language |page=652(25.38) |accessdate=2023-11-12}}</ref> and <code>tf_getlongp()</code><ref>{{cite web| url=https://perso.telecom-paristech.fr/guilley/ENS/20171205/TP/tp_syn/doc/IEEE_verilogHDL_1364-2001.pdf#page=628 |title=IEEE Standard Verilog® Hardware Description Language |page=628(25.28) |accessdate=2023-11-12}}</ref> which are used to write and read the 64-bit integer argument of the current Verilog task or function, respectively. For 32-bit integers, <code>tf_putp()</code><ref>{{cite web| url=https://perso.telecom-paristech.fr/guilley/ENS/20171205/TP/tp_syn/doc/IEEE_verilogHDL_1364-2001.pdf#page=653 |title=IEEE Standard Verilog® Hardware Description Language |page=653(25.39) |accessdate=2023-11-25}}</ref> and <code>tf_getp()</code><ref>{{cite web| url=https://perso.telecom-paristech.fr/guilley/ENS/20171205/TP/tp_syn/doc/IEEE_verilogHDL_1364-2001.pdf#page=631 |title=IEEE Standard Verilog® Hardware Description Language |page=631(25.21) |accessdate=2023-11-25}}</ref> are used.