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Interfacing with C Part-I

Friday, 25 March 2022 15:51 Semicon Editor 01

Local e method

In this case, you define an e method within a struct and indicate that the method's body is implemented as a C routine. When you call the e method, the name of the enclosing struct instance is passed to the C routine and the C routine is executed.

This way of calling C routines is useful when the C routine manipulates the fields of a particular struct instance. The syntax for declaring an e method whose body is implemented as a C routine is:

e-method-name(param,...) [:result-type] is C routine c-routine-name

Example-Local routine

.

  1 #include

  2 #include "c_interface2.h"

  4 void c_interface2 (int i, char* s) {

  5   int n;

  6   if ( i < 5) {

  7     for (n = 0; n < i; n ++) {

  8       printf("Hello World\n");

  9     }

 10   } else {

 11     printf("%s\n",s);

 12   }

 13 }

1 <'

  2 routine  c_hello(i : int, s : string) is C routine c_interface2;

  4 extend sys {

  6   run() is also {

  7     c_hello(1,"Test");

  8     c_hello(5,"Hello Deepak");

  9   };

 10 };

 11 '>

Compiling the example
.
Operation	Commands
Create h file	sn_compile.sh -h_only c_interface2.e -o c_interface2.h
Create c object file	gcc -c -o c_interface2.o c_interface2.c
Link c to e	sn_compile.sh -l c_interface2.o c_interface2.e -o c_interface2.run
Simulate	c_interface2.run -c "test"

local e method as dynamic Object

In either case, you define an e method within a struct and indicate that the method's body is implemented as a C routine. When you call an e method implemented as a dynamic C routine, the name of the enclosing struct instance is passed to the C routine and the C routine is executed. If the e method is implemented as a foreign dynamic C routine, the enclosing struct is not passed. The syntax for declaring an e method whose body is implemented as a dynamic C routine is:

e-method-name(param,...) [:result-type] is [also|first|only] [foreign] dynamic C routine [lib-name :][c-routine-name ]

  1 #include

  3 void c_interface (int i, char* s) {

  4   int n;

  5   if ( i < 5) {

  6     for (n = 0; n < i; n ++) {

  7       printf("Hello World\n");

  8     }

  9   } else {

 10     printf("%s\n",s);

 11   }

 12 }

  1 <'

  2 extend sys {

  3   c_interface(i:int, s:string) is foreign dynamic C routine c_interface3:;

  5   run() is also {

  6     var i : int = 1;

  7     c_interface(1,"");

  8     c_interface(5,"Hello Deepak");

  9   };

 10 };

 11 '>

Compiling the example

.

Operation	Commands
Create c object file	gcc -c c_interface3.c
Create lib file	ld -E -shared -o c_interface3.so c_interface3.o
Simulate	specman -c "load c_interface3;test"