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BEAM is the virtual machine for the Erlang programming language.

Opcode summary

Opcode	Mnemonic	# args
1	label	1
2	func_info	3
3	int_code_end	0
4	call	2
5	call_last	3
6	call_only	2
7	call_ext	2
8	call_ext_last	3
9	bif0	2
10	bif1	4
11	bif2	5
12	allocate	2
13	allocate_heap	3
14	allocate_zero	2
15	allocate_heap_zero	3
16	test_heap	2
17	init	1
18	deallocate	1
19	return	0
20	send	0
21	remove_message	0
22	timeout	0
23	loop_rec	2
24	loop_rec_end	1
25	wait	1
26	wait_timeout	2
27	m_plus	4
28	m_minus	4
29	m_times	4
30	m_div	4
31	int_div	4
32	int_rem	4
33	int_band	4
34	int_bor	4
35	int_bxor	4
36	int_bsl	4
37	int_bsr	4
38	int_bnot	3
39	is_lt	3
40	is_ge	3
41	is_eq	3
42	is_ne	3
43	is_eq_exact	3
44	is_ne_exact	3
45	is_integer	2
46	is_float	2
47	is_number	2
48	is_atom	2
49	is_pid	2
50	is_reference	2
51	is_port	2
52	is_nil	2
53	is_binary	2
54	is_constant	2
55	is_list	2
56	is_nonempty_list	2
57	is_tuple	2
58	test_arity	3
59	select_val	3
60	select_tuple_arity	3
61	jump	1
62	catch	2
63	catch_end	1
64	move	2
65	get_list	3
66	get_tuple_element	3
67	set_tuple_element	3
68	put_string	3
69	put_list	3
70	put_tuple	2
71	put	1
72	badmatch	1
73	if_end	0
74	case_end	1
75	call_fun	1
76	make_fun	3
77	is_function	2
78	call_ext_only	2
79	bs_start_match	2
80	bs_get_integer	5
81	bs_get_float	5
82	bs_get_binary	5
83	bs_skip_bits	4
84	bs_test_tail	2
85	bs_save	1
86	bs_restore	1
87	bs_init	2
88	bs_final	2
89	bs_put_integer	5
90	bs_put_binary	5
91	bs_put_float	5
92	bs_put_string	2
93	bs_need_buf	1
94	fclearerror	0
95	fcheckerror	1
96	fmove	2
97	fconv	2
98	fadd	4
99	fsub	4
100	fmul	4
101	fdiv	4
102	fnegate	3
103	make_fun2	1
104	try	2
105	try_end	1
106	try_case	1
107	try_case_end	1
108	raise	2
109	bs_init2	6
110	bs_bits_to_bytes	3
111	bs_add	5
112	apply	1
113	apply_last	2
114	is_boolean	2
115	is_function2	3
116	bs_start_match2	5
117	bs_get_integer2	7
118	bs_get_float2	7
119	bs_get_binary2	7
120	bs_skip_bits2	5
121	bs_test_tail2	3
122	bs_save2	2
123	bs_restore2	2
124	gc_bif1	5
125	gc_bif2	6
126	bs_final2	2
127	bs_bits_to_bytes2	2
128	put_literal	2
129	is_bitstr	2
130	bs_context_to_binary	1
131	bs_test_unit	3
132	bs_match_string	4
133	bs_init_writable	0
134	bs_append	8
135	bs_private_append	6
136	trim	2
137	bs_init_bits	6
138	bs_get_utf8	5
139	bs_skip_utf8	4
140	bs_get_utf16	5
141	bs_skip_utf16	4
142	bs_get_utf32	5
143	bs_skip_utf32	4
144	bs_utf8_size	3
145	bs_put_utf8	3
146	bs_utf16_size	3
147	bs_put_utf16	3
148	bs_put_utf32	3
149	on_load	0
150	recv_mark	1
151	recv_set	1
152	gc_bif3	7

References

• Joe Armstrong, Deconstructing the BEAM, 2012-05-07
• Joe Armstrong, Robert Virding, The Evolution of the Erlang VM
• Robert Virding, A history of the Erlang VM