Compilation time and runtime in perl

Question

I am reading this document to understand the life cycle of a Perl program.

I can not understand when the RUN time and when COMPILE time events occur when running the perl script on the command line as follows:

perl my_script.pl 

Answer 1

perl script.pl will compile script.pl , then execute script.pl . Similarly, require Module; will compile Module.pm , then execute Module.pm .

If the compiler encounters a BEGIN block, it will execute the block as soon as the block is compiled. Keep in mind that use is a BEGIN block consisting of require and possibly a import .

For instance,

 # script.pl use Foo; my $foo = Foo->new(); $foo->do(); 

whether:

• Compile script.pl
  • Compile use Foo;
  • Run require Foo;
    • Compile Foo.pm
      • ...
    • Run Foo.pm
      • ...
  • Run import Foo;
  • Compile my $foo = Foo->new();
  • Compile $foo->do();
• Run script.pl
  • Run my $foo = Foo->new();
  • Run $foo->do();