CodegenDecl pragma

The codegenDecl pragma can be used to directly influence Nim’s code generator. It receives a format string that determines how the variable or proc is declared in the generated code.

For variables $1 in the format string represents the type of the variable and $2 is the name of the variable.

The following Nim code:

var
  a {.codegenDecl: "$# progmem $#".}: int

will generate this C code:

int progmem a

For procedures $1 is the return type of the procedure, $2 is the name of the procedure and $3 is the parameter list.

The following nim code:

proc myinterrupt() {.codegenDecl: "__interrupt $# $#$#".} =
  echo "realistic interrupt handler"

will generate this code:

__interrupt void myinterrupt()