User:Zarutian/Smallcaps

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(Notes on smallcaps)
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Notes of what I have gleaned from the incomplete spefication and implementation of Smallcaps.
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Notes of what I have cleaned from the incomplete spefication and implementation of Smallcaps.
Smallcaps is a bytecode based format of executable code.
Smallcaps is a bytecode based format of executable code.
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The opcodes are:
The opcodes are:
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   Hex Memnomic         Effects/Description
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   Hex Memnomic  Effects
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  0x01 OP_DUP          [x],[] => OP_DUP => [x, x],[]
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  0x02 OP_POP          [x],[] => OP_POP => [],[]
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  0x03 OP_SWAP          [x, y],[] => OP_SWAP => [y, x],[]
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  0x04 OP_ROT          [x, y, z],[] => OP_ROT => [y, z, x],[]
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  0x05 OP_RETURN        [x],[] => OP_RETURN
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  0x08 OP_JUMP          [],[] => OP_JUMP(label) => [],[]
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                        label := ?Waterken Wholenum?
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  0x09 OP_BRANCH        [ootEjector, flag],[] => OP_BRANCH => [],[]
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  0x0A OP_CALL_ONLY    [recip, args...],[] => OP_CALL_ONLY(verb, arity) => [],[]
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  0x0B OP_CALL          [recip, args...],[] => OP_CALL(verb, arity) => [result],[]
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                        verb := ?Waterken UTF8 string?
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                        arity := ?Waterken Wholenum?
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  0x0E OP_EJECTOR_ONLY [],[] => OP_EJECTOR_ONLY(label) => [ejector],[handler]
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                        when ejector is invoked: [...],[...] => ejector(_) => [],[]
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  0x0F OP_EJECTOR      [],[] => OP_EJECTOR(label) => [ejector],[handler]
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                        when ejector is invoked: [...],[...] => ejector(result) => [result],[]
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  0x10 OP_TRY          [],[] => OP_TRY(label) => [],[handler]
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                        when handler is invoked: [...],[...] => handler(arg) => [arg],[]
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                        when handler is dropped: [...],[...] => handler.drop(_) => [...],[...]
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  0x11 OP_UNWIND        [],[] => OP_UNWIND(label) => [],[handler]
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                        when handler is invoked: [...],[...] => handler(arg) => [rethrower(arg)],[]
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                        when handler is dropped: [...],[...] => handler.drop(pc) => [returner(pc)],[]
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  0x12 OP_END_HANDLER  [],[handler] => OP_END_HANDLER => [],[]
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  0x16 OP_WHOLE_NUM    [],[] => OP_WHOLE_NUM(wholeNum) => [wholeNum],[]
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  0x17 OP_NEG_INT      [],[] => OP_NEG_INT(wholeNum) => [-wholeNum],[]
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  0x18 OP_FLOAT64      [],[] => OP_FLOAT64(float64) => [float64],[]
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  0x19 OP_CHAR          [],[] => OP_CHAR(chr) => [chr],[]
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  0x1A OP_STRING        [],[] => OP_STRING(str) => [str],[]
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  0x1B OP_TWINE        [],[] => OP_TWINE(twine) => [twine],[]
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  0x1C OP_TRUE          [],[] => OP_TRUE => [true],[]
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  0x1D OP_FALSE        [],[] => OP_FALSE => [false],[]
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  0x1E OP_NULL          [],[] => OP_NULL => [null],[]
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  0x1F OP_SCOPE        [],[] => OP_SCOPE => [scope],[]
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  0x20 OP_OBJECT        [ivars..., auditors...],[] => OP_OBJECT(wholeNum numOfFields, wholeNum scriptIndex) => [object],[]
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                        metanote: hypothesis: OP_OBJECT takes these immitiate args:
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                                    wholenum of ivarAuditorpairs to pop of the stack
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                                    some sort of reference to code that handles calls and sends to the object
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  0x21 OP_LIST_PATT    [optEjector, specimen],[] => OP_LIST_PATT(n) => [optEjector, specimen[n-1]..., optEjector, specimen[0]]
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                        metanote: is n a wholenum?
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  0x22 OP_CDR_PATT
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  0x28 OP_NOUN
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    +addrMode
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  0x30 OP_SLOT
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    +addrMode
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  0x38 OP_ASSIGN
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    +addrMode
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  0x40 OP_BIND
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    +addrMode
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  0x48 OP_BIND_SLOT
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    +addrMode
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[[User:dash|dash]] pointed me to http://bazaar.launchpad.net/~washort/ecru/trunk/annotate/head:/doc/smallcaps.txt which is also a bit stale and to http://bazaar.launchpad.net/~washort/ecru/trunk/annotate/head:/esrc/com/twistedmatrix/ecru/compiler.emaker
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  0x1 OP_DUP      [x],[] => OP_DUP => [x, x],[]
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  0x2 OP_POP     [x],[] => OP_POP => [],[]
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http://bazaar.launchpad.net/~washort/ecru/trunk/annotate/head%3A/src/vm.c
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  0x3 OP_SWAP    [x, y],[] => OP_SWAP => [y, x],[]
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  0x4 OP_ROT      [x, y, z],[] => OP_ROT => [y, z, x],[]
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See also http://epan.cvs.sourceforge.net/viewvc/epan/epan/lib/smallcaps/org/erights/e/elang/smallcaps/SmallcapsEncoder.java?view=markup
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  0x5 OP_RETURN  [x],[] => OP_RETURN
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And http://epan.cvs.sourceforge.net/viewvc/epan/epan/lib/smallcaps/org/erights/e/elang/smallcaps/SmallcapsOps.java?view=markup
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<pre><nowiki>
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  # A Tcl procedure that decodes smallcaps bytecode stream
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  proc decode_smallcaps {input} {
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    set output [list]
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    set op [read_byte]
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    switch -exact -- $op {
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      "\x01" { lappend output [list OP_DUP] }
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      "\x02" { lappend output [list OP_POP] }
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      "\x03" { lappend output [list OP_SWAP] }
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      "\x04" { lappend output [list OP_ROT] }
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      "\x05" { lappend output [list [list OP_UNDERDUP OP_RETURN]] }
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      "\x06" { lappend output [list [list OP_RETURN {}]] }
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      "\x07" { lappend output [list unused_bytecode 1] }
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      "\x08" { lappend output [list OP_JUMP [read_wholeNum]] }
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      "\x09" { lappend output [list OP_BRANCH] }
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      "\x0a" { lappend output [list OP_CALL_ONLY [read_string] [read_wholeNum]] }
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      "\x0b" { lappend output [list OP_CALL [read_string] [read_wholeNum]] }
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      "\x0c" { lappend output [list OP_SEND_ONLY [read_string] [read_wholeNum]] }
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      "\x0d" { lappend output [list OP_SEND [read_string] [read_wholeNum]] }
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      "\x0e" { lappend output [list OP_EJECTOR_ONLY [read_wholeNum]] }
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      "\x0f" { lappend output [list OP_EJECTOR [read_wholeNum]] }
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      "\x10" { lappend output [list OP_TRY [read_wholeNum]] }
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      "\x11" { lappend output [list OP_UNWIND [read_wholeNum]] }
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      "\x12" { lappend output [list OP_ENDHANDLER] }
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      "\x13" { lappend output [list unused_bytecode 2] }
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      "\x14" { lappend output [list unused_bytecode 3] }
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      "\x15" { lappend output [list unused_bytecode 4] }
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      "\x16" { lappend output [list OP_WHOLENUM [read_wholeNum]] }
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      "\x17" { lappend output [list OP_NEG_INT [read_wholeNum]] }
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      "\x18" { lappend output [list OP_FLOAT64 [read_float64]] }
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      "\x19" { lappend output [list OP_CHAR [read_char]] }
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      "\x1a" { lappend output [list OP_STRING [read_string]] }
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      "\x1b" { lappend output [list OP_TWINE ???unknown_arity???]] }
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      "\x1c" { lappend output [list OP_TRUE]] }
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      "\x1d" { lappend output [list OP_FALSE]] }
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      "\x1e" { lappend output [list OP_NULL]] }
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      "\x1f" { lappend output [list OP_SCOPE]] }
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      "\x20" { lappend output [list OP_OBJECT [read_wholeNum] [read_wholeNum]] }
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      "\x21" { lappend output [list OP_LIST_PATT [read_wholeNum]] }
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      "\x22" { lappend output [list OP_LIST_PATT_ONLY [read_wholeNum]] }
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      "\x23" { lappend output [list OP_CDR_PATT [read_wholeNum]] }
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      "\x24" { lappend output [list OP_CDR_PATT_ONLY [read_wholeNum]] }
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      "\x25" { lappend output [list unused_bytecode 5]] }
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      "\x26" { lappend output [list unused_bytecode 6]] }
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      "\x27" { lappend output [list unused_bytecide 7]] }
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    }
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    return $output
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  }
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</nowiki></pre>
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Revision as of 16:52, 30 January 2010

Notes of what I have cleaned from the incomplete spefication and implementation of Smallcaps.

Smallcaps is a bytecode based format of executable code.

The opcodes are: 

 Hex Memnomic  Effects

 0x1 OP_DUP      [x],[] => OP_DUP => [x, x],[]
 0x2 OP_POP      [x],[] => OP_POP => [],[]
 0x3 OP_SWAP     [x, y],[] => OP_SWAP => [y, x],[]
 0x4 OP_ROT      [x, y, z],[] => OP_ROT => [y, z, x],[]
 0x5 OP_RETURN   [x],[] => OP_RETURN
Retrieved from "http://wiki.erights.org/wiki/User:Zarutian/Smallcaps"
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