NAME

var.ops - Variable Opcodes

DESCRIPTION

These operations deal with both lexical and global variables, as well as the symbol tables that contain them.

When making changes to any ops file, run make bootstrap-ops to regenerate all generated ops files.

Lexical variable ops

Operations to create, modify and delete lexical variables.

Store object $2 as lexical symbol $1. The opcode might succeed or throw an exception on unknown lexical names depending on the implementation of the LexPad PMC. Requires that the lexical is stored in a PMC register.

Parrot's LexPad throws an exception for unknown names.

store_lex(in STR, in STR)

Parrot's LexPad throws an exception for unknown names.

store_lex(in STR, in INT)

Parrot's LexPad throws an exception for unknown names.

store_lex(in STR, in NUM)

Parrot's LexPad throws an exception for unknown names.

store_dynamic_lex(in STR, invar PMC)

Search caller lexpads for lexical symbol $1 and store object $2 there. Throws an exception if no caller lexpad claims the lexical symbol. (To store a value in the current lexpad, use store_lex above.)

find_lex(out PMC, in STR)

Find the lexical variable named $2 and store it in $1. Return a Null PMC if the variable is not found. Requires that the lexical be in a PMC register.

find_lex(out STR, in STR)

Find the lexical variable named $2 and store it in $1. Requires that the lexical be in a STR register.

find_lex(out INT, in STR)

Find the lexical variable named $2 and store it in $1. Requires that the lexical be in a INT register.

find_lex(out NUM, in STR)

Find the lexical variable named $2 and store it in $1. Requires that the lexical be in a NUM register.

find_dynamic_lex(out PMC, in STR)

Search through caller lexpads for a lexical variable named $2 and store it in $1. Return a Null PMC if the lexical variable is not found. (To search the current lexpad, use find_lex above.)

find_caller_lex(out PMC, in STR)

Like find_dynamic_lex above, but also searches caller's outer scopes in addition to the lexpads.

Namespace opcodes

get_namespace(out PMC): Set $1 to the current namespace.
get_namespace(out PMC, in PMC): Set $1 to the namespace denoted by the key constant $2, relative to the current namespace. If the namespace doesn't exist, $1 is set to null.
get_hll_namespace(out PMC): Set $1 to the current HLL root namespace.
get_hll_namespace(out PMC, in PMC): Set $1 to the namespace denoted by the key constant $2, relative to the current HLL root namespace. If the namespace doesn't exist, $1 is set to null.
get_root_namespace(out PMC): Set $1 to the true root namespace.
get_root_namespace(out PMC, in PMC): Set $1 to the namespace denoted by the key constant $2, relative to the true root namespace. If the namespace doesn't exist, $1 is set to null.

Global variable 'get' opcodes

get_global(out PMC, in STR): Set $1 to the global named $2 in current namespace. If the global doesn't exist, $1 is set to null.
get_global(out PMC, in PMC, in STR): Set $1 to the global named $3 in the namespace denoted by the key constant $2, relative to the current namespace. If the namespace or the global doesn't exist, $1 is set to null.
get_hll_global(out PMC, in STR): Set $1 to the global named $2 in the current HLL root namespace. If the global doesn't exist, $1 is set to null.
get_hll_global(out PMC, in PMC, in STR): Set $1 to the global named $3 in the namespace denoted by the key constant $2, relative to the current HLL root namespace. If the namespace or the global doesn't exist, $1 is set to null.
get_root_global(out PMC, in STR): Set $1 to the global named $2 in the true root namespace. If the global doesn't exist, $1 is set to null.
get_root_global(out PMC, in PMC, in STR): Set $1 to the global named $3 in the namespace denoted by the key constant $2, relative to the true root namespace. If the namespace or the global doesn't exist, $1 is set to null.

Global variable 'set' opcodes

set_global(in STR, invar PMC): Set the global named $1 in the current namespace to $2.
set_global(in PMC, in STR, invar PMC): Set the global named $2 in the namespace denoted by the key constant $1, relative to the current namespace, to $3. If the namespace does not exist, it is created.
set_hll_global(in STR, invar PMC): Set the global named $1 to $2 in the current HLL root namespace.
set_hll_global(in PMC, in STR, invar PMC): Set the global named $2 in the namespace denoted by the key constant $1 (relative to the current HLL namespace) to $3. If the namespace does not exist, it is created.
set_root_global(in STR, invar PMC): Set the global named $1 in the true root namespace to $2.
set_root_global(in PMC, in STR, invar PMC): Set the global named $2 in the namespace denoted by the key constant $1 (relative to the true root namespace) to $3. If the namespace does not exist, it is created.

Global variable ops

Operations to modify global variables

find_name(out PMC, in STR): Find the name $2 in lexicals, then the current namespace, then the HLL root namespace, and finally Parrot builtins. These are checked in order and the first match is returned in $1. If no matches are found, either throws an exception or sets $1 to PMCNULL, depending on current errors settings. See errorson.
find_sub_not_null(out PMC, in STR): Do the same thing as find_name, but throw an exception if the name isn't found.

COPYRIGHT

LICENSE

This program is free software. It is subject to the same license as the Parrot interpreter itself.