NAME

SPVM - Static Perl Virtual Machine. Fast Calculation, Fast Array Operation, and Easy C/C++ Binding.

SYNOPSIS

SPVM Module:

# lib/MyMath.spvm
package MyMath {
  sub sum : int ($nums : int[]) {
    
    my $total = 0;
    for (my $i = 0; $i < @$nums; $i++) {
      $total += $nums->[$i];
    }
    
    return $total;
  }
}

Use SPVM Module from Perl

# spvm.pl
use strict;
use warnings;
use FindBin;
use lib "$FindBin::Bin/lib";

use SPVM 'MyMath';

# Call subroutine
my $total = MyMath->sum([3, 6, 8, 9]);

print "Total: $total\n";

# Call subroutine with packed data
my $nums_packed = pack('l*', 3, 6, 8, 9);
my $sv_nums = SPVM::new_int_array_from_bin($nums_packed);
my $total_packed = MyMath->sum($sv_nums);

print "Total Packed: $total_packed\n";

Precompiled SPVM Subroutine. This means SPVM code is converted to Machine Code:

# lib/MyMath.spvm
package MyMath {
  precompile sub sum_precompile : int ($nums : int[]) {
    
    my $total = 0;
    for (my $i = 0; $i < @$nums; $i++) {
      $total += $nums->[$i];
    }
    
    return $total;
  }
}

Call SPVM Precompile Subroutine from Perl

# spvm.pl
use strict;
use warnings;
use FindBin;
use lib "$FindBin::Bin/lib";

use SPVM 'MyMath';

# Call precompile subroutine
my $total_precompile = MyMath->sum_precompile([3, 6, 8, 9]);

print "Total Precompile: $total_precompile\n";

SPVM Native Subroutine. This means SPVM subroutine call C/C++ native subroutine:

# lib/MyMath.spvm
package MyMath {
  native sub sum_native : int ($nums : int[]);
}

// lib/MyMath.c
#include "spvm_native.h"

int32_t SPNATIVE__MyMath__sum_native(SPVM_ENV* env, SPVM_VALUE* stack) {
  
  void* sv_nums = stack[0].oval;
  
  int32_t length = env->length(env, sv_nums);
  
  int32_t* nums = env->get_elems_int(env, sv_nums);
  
  int32_t total = 0;
  for (int32_t i = 0; i < length; i++) {
    total += nums[i];
  }
  
  stack[0].ival = total;
  
  return SPVM_SUCCESS;
}

# lib/MyMath.config

use strict;
use warnings;

use SPVM::Builder::Config;
my $bconf = SPVM::Builder::Config->new_c99;

$bconf;

Use SPVM Native Subroutine from Perl

# spvm.pl
use strict;
use warnings;
use FindBin;
use lib "$FindBin::Bin/lib";

use SPVM 'MyMath';

# Call native subroutine
my $total_native = MyMath->sum_native([3, 6, 8, 9]);

print "Total Native: $total_native\n";

Environment Variable "SPVM_BUILD_DIR" must be set for precompile and native subroutine

# bash example
export SPVM_BUILD_DIR=~/.spvm_build

DESCRIPTION

SPVM is Static Perl Virtual Machine. Provide fast calculation & easy C/C++ Binding.

Features:

Fast culcuration, Fast array operation, Small memory
Perl syntax, Static typing, Switch syntax, Have language specification
Enum, Type inference, Anon subroutine, Variable captures
Array initialization,
Reference count GC, Weaken reference, Module system
Exception, Package variable
Object oriented, Inteface, Value type, Value array type, Reference type
Easy way to C/C++ binding, Automatically Perl binding, C99 math functions
Shared Library, Precompile Subroutine into Machine code
Native API(C level api), C99 standard

DOCUMENT

Currently some ports of document are use Automatic translation, so not accurate and maybe difficult to read.

CORE MODULES

SPVM Core Modules.

GETTING STARTED

Get started with SPVM.

At first I will explain how to write for statement in SPVM.

Next, I will explain how to precompile SPVM subroutines so that they run at the same speed as in machine language.

Finally, I will explain how to write SPVM subroutines biding C language.

If you are interested in the SPVM tutorial, see SPVM Tutorial.

SPVM Tutorial

How to write SPVM language

This is a simple example using the SPVM for statement.

# lib/MyMath.spvm
package MyMath {
  sub sum : int ($nums : int[]) {
    
    my $total = 0;
    for (my $i = 0; $i < @$nums; $i++) {
      $total += $nums->[$i];
    }
    
    return $total;
  }
}

You create "lib" direcotry and create "MyMath.spvm" file.

The extension of SPVM is ".spvm".

SPVM need package definition.

package MyMath {

}

See SPVM subroutine definition.

package MyMath {
  sub sum : int ($nums : int[]) {
  
  }
}

"int" after subroutine name "sum" is return value type.

"int" is signed 32bit numeric type.

"int[]" is argument type.

"int[]" is array type that element type is "int".

SPVM is static type language. You must specify subroutine return type and argument type.

See subroutine implementation.

sub sum : int ($nums : int[]) {
  
  my $total = 0;
  for (my $i = 0; $i < @$nums; $i++) {
    $total += $nums->[$i];
  }
  
  return $total;
}

"my" is lexical variable declaration.

my $total = 0;

There is no type declaration. Type inference is performed using the value on the right side. Same as the description below.

my $total :int = 0;

See for loop.

for (my $i = 0; $i < @$nums; $i++) {
  $total += $nums->[$i];
}

for loop is same as Perl syntax. You can get array length by @. @ is array length operator in all context instead of Perl.

Array access use arrow operator.

$nums->[$i]

At last, return value.

return $total;

If you want to know the syntax of SPVM, the SPVM Language Specification has a complete description.

SPVM Language Specification

How to call SPVM subroutine from Perl

You may be surprised to know that SPVM subroutines can be called directly from Perl.

use FindBin;
use lib "$FindBin::Bin/lib";

use SPVM 'MyMath';

# Call subroutine
my $total = MyMath->sum([3, 6, 8, 9]);

print $total . "\n";

To load an SPVM module from Perl, use the following syntax.

use SPVM 'MyMath';

Call SPVM subroutine from Perl.

# Call subroutine
my $total = MyMath->sum([3, 6, 8, 9]);

Perl array reference is converted to SPVM int array, and call sum method of MyMath, and SPVM int value of return value is converted to Perl Scalar.

If you want to know the rules for calling SPVM subroutines from Perl, and the rules for converting Perl and SPVM values, see the SPVM Exchagne API.

SPVM Exchange API

How to improve performacne using subroutine precompile

See how to speed up SPVM subroutines. SPVM subroutines can be converted into machine code by precompile descriptor.

# lib/MyMath.spvm
package MyMath {
  precompile sub sum_precompile : int ($nums : int[]) {
    
    my $total = 0;
    for (my $i = 0; $i < @$nums; $i++) {
      $total += $nums->[$i];
    }
    
    return $total;
  }
}

Subroutine code is same as non precompile subroutine.

A build directory is required to precompile subroutines.

You set SPVM_BUILD_DIR. The following is bash example.

# ~/.bashrc
export SPVM_BUILD_DIR=~/.spvm_build

How fast will it be? See SPVM Peformance Benchmark.

SPVM Performance Benchmark

How to improve performacne using native subroutine

If you want, you can native subroutine for performance with native descriptor.

# lib/MyMath.spvm
package MyMath {
  native sub sum_native : int ($nums : int[]);
}

Native subrosutine is binding a function of C langage.

// lib/MyMath.c
#include "spvm_native.h"

int32_t SPNATIVE__MyMath__sum_native(SPVM_ENV* env, SPVM_VALUE* stack) {
  
  void* sv_nums = stack[0].oval;
  
  int32_t length = env->length(env, sv_nums);
  
  int32_t* nums = env->get_elems_int(env, sv_nums);
  
  int32_t total = 0;
  for (int32_t i = 0; i < length; i++) {
    total += nums[i];
  }
  
  stack[0].ival = total;
  
  return SPVM_SUCCESS;
}

File name is "MyMath.c".

At first, include "spvm_native.h". This header provide SPVM Native API.

#include "spvm_native.h"

See the declaration of C function.

int32_t SPNATIVE__MyMath__sum_native(SPVM_ENV* env, SPVM_VALUE* stack) {

  return SPVM_SUCCESS;
}

Return value type is int32_t. The return value indicates that the subroutine did not throw an exception.

SPVM_SUCCESS is macro that value is 0 defined in "spvm_native.h".

C function name start SPNATIVE__. Package name "MyMath" and subroutine name "sum_native" is joined by "__".

If package name contains double colon(Foo::Bar), double colon is replaced by "__".

First argument is a pointer to SPVM_ENV object. This variable has SPVM runtime information.

Second argument is SPVM_VALUE array. stack contains arguments of SPVM subroutine.

And stack is also used to set return value of SPVM subroutine.

See implementation of C function.

int32_t SPNATIVE__MyMath__sum_native(SPVM_ENV* env, SPVM_VALUE* stack) {
  
  void* sv_nums = stack[0].oval;
  
  int32_t length = env->length(env, sv_nums);
  
  int32_t* nums = env->get_elems_int(env, sv_nums);
  
  int32_t total = 0;
  for (int32_t i = 0; i < length; i++) {
    total += nums[i];
  }
  
  stack[0].ival = total;
  
  return SPVM_SUCCESS;
}

At first, get first argument of SPVM subroutine.

void* sv_nums = stack[0].oval;

"int[]" is array type. array type is also object type. You can get a object by oval field.

Get array length.

int32_t length = env->length(env, sv_nums);

Get numeric int32_t array of C langage. SPVM int type is same as int32_t type of C language.

int32_t* nums = env->get_elems_int(env, sv_nums);

Calcuration.

int32_t total = 0;
for (int32_t i = 0; i < length; i++) {
  total += nums[i];
}

At last, set return value to the first element of stack as int type. ival filed is used to get or set int32_t value.

stack[0].ival = total;

Note that you do not return the SPVM return value with the return keyword of C langauge.

return value of C function indicates whether the subroutine throw an exception.

If you write a native subroutine, you must write a configuration file.

The configuration file for native subroutines is a Perl script.

# lib/MyMath.config

use strict;
use warnings;

use SPVM::Builder::Config;
my $bconf = SPVM::Builder::Config->new_c99;

$bconf;

If you write SPVM subroutine using C language, you can use new_c99 method of SPVM::Builder::Config.

If you want to see SPVM Native API like length and get_elems_int

int32_t length = env->length(env, sv_nums);

int32_t* nums = env->get_elems_int(env, sv_nums);

See SPVM Native API.

SPVM Native API

A build directory is required to native subroutines.

You set SPVM_BUILD_DIR. The following is bash example.

# ~/.bashrc
export SPVM_BUILD_DIR=~/.spvm_build

How fast will it be? See SPVM Peformance Benchmark.

SPVM Performance Benchmark

ENVIRONMENT VARIABLE

SPVM_BUILD_DIR

SPVM build directory for precompile and native subroutine.

If SPVM_BUILD_DIR environment variable is not set, SPVM can't compile precompile subroutine and native subroutine, and a exception occur. You see error message "SPVM_BUILD_DIR environment variable must be set ...".

In bash, you can set SPVM_BUILD_DIR to the following.

export SPVM_BUILD_DIR=~/.spvm_build

CAUTION

This release is beta release before SPVM 1.0. Features is changed without warnings.

SPVM 1.0 is First Major Release

But Full backward compatibility is not guaranteed because SPVM is not used much in corporate work yet.

If SPVM has fatal bugs in the specification or implementation, the backward compatibility is broken and the bug will be fixed after discussion.

SUPPORT

If you have problems or find bugs, comment to GitHub Issue.

SPVM(GitHub).

AUTHOR

Yuki Kimoto <kimoto.yuki@gmail.com<gt>

CORE DEVELOPERS

moti<lt>motohiko.ave@gmail.com<gt>

CONTRIBUTERS

Mohammad S Anwar
akinomyoga
NAGAYASU Shinya
Reini Urban
chromatic
Kazutake Hiramatsu

COPYRIGHT & LICENSE

This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

1 POD Error

The following errors were encountered while parsing the POD:

Around line 392:: You forgot a '=back' before '=head1'

To install SPVM, copy and paste the appropriate command in to your terminal.

cpanm

cpanm SPVM

CPAN shell

perl -MCPAN -e shell
install SPVM

For more information on module installation, please visit the detailed CPAN module installation guide.

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