---
name: "B::Asmdata"
section: "3perl"
platform: "linux"
package: "perl-doc"
version: "5.8.8-7etch6"
release: "Debian 4.0 (Etch)"
platforms: ["linux"]
url: "https://new.carta.tech/B::Asmdata"
---

# B::Asmdata(3perl)

Autogenerated data about Perl ops, used to generate bytecode

## NAME

B::Asmdata - Autogenerated data about Perl ops, used to generate bytecode

## SYNOPSIS

```
        use B::Asmdata qw(%insn_data @insn_name @optype @specialsv_name);
```

## DESCRIPTION

Provides information about Perl ops in order to generate bytecode via a bunch of exported variables.  Its mostly used by B::Assembler and B::Disassembler.

- %insn\_data

  ```
    my($bytecode_num, $put_sub, $get_meth) = @$insn_data{$op_name};
  ```

  For a given `$op_name` (for example, 'cop\_label', 'sv\_flags', etc...)  you get an array ref containing the bytecode number of the op, a reference to the subroutine used to 'PUT', and the name of the method used to 'GET'.

- @insn\_name

  ```
    my $op_name = $insn_name[$bytecode_num];
  ```

  A simple mapping of the bytecode number to the name of the op. Suitable for using with `%insn_data` like so:

  ```
    my $op_info = $insn_data{$insn_name[$bytecode_num]};
  ```

- @optype

  ```
    my $op_type = $optype[$op_type_num];
  ```

  A simple mapping of the op type number to its type (like 'COP' or 'BINOP').

- @specialsv\_name

  ```
    my $sv_name = $specialsv_name[$sv_index];
  ```

  Certain SV types are considered 'special'.  They're represented by B::SPECIAL and are referred to by a number from the specialsv\_list. This array maps that number back to the name of the SV (like 'Nullsv' or '&PL\_sv\_undef').

## AUTHOR

Malcolm Beattie, `"mbeattie@sable.ox.ac.uk"`