Bytecode

Ukázka bytekódu virtuálního stroje Parrot.

See

• Format of the Parrot bytecode
• PackFile Manipulation Functions
• Inside Virtual Machines
• src/ops/ in Parrot repository

cat lgp01.pasm

<syntax lang=pasm>

.pcc_sub _sub1:
   set I1, 10
   print "in sub1\n"
   add I0, 5
   add I1, 10
returncc

</syntax>

parrot -o lgp01.pbc lgp01.pasm && pdump -d lgp01.pbc

    HEADER => [
        wordsize  = 4	(interpreter's wordsize    = 4)
        int_size  = 4	(interpreter's INTVAL size = 4)
        byteorder = 0	(interpreter's byteorder   = 0)
        floattype = 0	(interpreter's NUMVAL_SIZE = 8)
        no endianize, no opcode, no numval transform
        dirformat = 1
    ]
    DIRECTORY => [ # offs 0x20(32) = op_count 188, itype 0, id 0, size 0, ...
        # 5 segments
        type 4	BYTECODE_lgp01.pasm	 offs 0x38(0xe0)	op_count 16
        type 2	FIXUP_lgp01.pasm	 offs 0x48(0x120)	op_count 12
        type 3	CONSTANT_lgp01.pasm	 offs 0x54(0x150)	op_count 84
        type 1	PIC_idx_lgp01.pasm	 offs 0xa8(0x2a0)	op_count 12
        type 5	BYTECODE_lgp01.pasm_DB	 offs 0xb4(0x2d0)	op_count 16
    ]
    BYTECODE_lgp01.pasm => [ # 12 ops at offs 0x3c
     0000:  00000320 00000001 0000000a                            set_i_ic
     0003:  0000019d 00000001                                     print_sc
     0005:  00000206 00000000 00000005                            add_i_ic
     0008:  00000206 00000001 0000000a                            add_i_ic
     000b:  00000022                                              returncc
    ]
    FIXUP_lgp01.pasm => [
        #0
        type => 2 offs =>        3 name => '_sub1',
    ],
    CONSTANT_lgp01.pasm => [
        # 0:
        [ 'PFC_PMC', {
        unknown PMC
        } ],
        # 1:
        [ 'PFC_STRING', {
            FLAGS    => 0x21100,
            CHARSET  => 5777888,
            SIZE     => 8,
            DATA     => 'in sub1
    '
        } ],
        # 2:
        [ 'PFC_STRING', {
            FLAGS    => 0x21100,
            CHARSET  => 5777888,
            SIZE     => 10,
            DATA     => 'lgp01.pasm'
        } ],
        # 3:
        [ 'PFC_PMC', {
        class => Sub,
        start_offs => 0,
        end_offs => 12,
        name => '_sub1',
        namespace => '(keyed)'
        } ],
        # 4:
        [ 'PFC_STRING', {
            FLAGS    => 0x21100,
            CHARSET  => 5777888,
            SIZE     => 5,
            DATA     => '_sub1'
        } ],
    ],
    PIC_idx_lgp01.pasm => [ # offs 0xa8(168) = op_count 12, itype 0, id 0, size 6, ...
     0000:  00000000 5f786469 3070676c 61702e31 00006d73 00000000 
    ]
    BYTECODE_lgp01.pasm_DB => [ # offs 0xb4(180) = op_count 16, itype 0, id 0, size 6, ...mappings => [
        #0
        [
            OFFSET => 0,
            MAPPINGTYPE => FILENAME,
            FILENAME => lgp01.pasm
        ],
    ]

     0000:  00000002 00000003 00000004 00000005 00000006 00004244 
    ]

pdump is created by make parrot_utils