# An implementation of the Retro VM in Ruby
# Based on the C and Javascript VM from Retro
# Written by Mathieu Blondel, 2009
# Public domain

class RetroVM

    IMAGE_FILE = "retroImage"

    IMAGE_SIZE  = 5000000          # Amount of memory to provide
    STACK_DEPTH =     100          # Depth of the stacks
    CYCLES_PER  =    2000

    VM_NOP = 0;       VM_LIT = 1;         VM_DUP = 2
    VM_DROP = 3;      VM_SWAP = 4;        VM_PUSH = 5
    VM_POP = 6;       VM_CALL = 7;        VM_JUMP = 8
    VM_RETURN = 9;    VM_GT_JUMP = 10;    VM_LT_JUMP = 11
    VM_NE_JUMP = 12;  VM_EQ_JUMP = 13;    VM_FETCH = 14
    VM_STORE = 15;    VM_ADD = 16;        VM_SUB = 17
    VM_MUL = 18;      VM_DIVMOD = 19;     VM_AND = 20
    VM_OR = 21;       VM_XOR = 22;        VM_SHL = 23
    VM_SHR = 24;      VM_ZERO_EXIT = 25;  VM_INC = 26
    VM_DEC = 27;      VM_IN = 28;         VM_OUT = 29
    VM_WAIT = 30

    def initialize(stdin=STDIN, stdout=STDOUT)
        @in = stdin; @out = stdout
        @run = false
        @data = Array.new(STACK_DEPTH, 0)
        @address = Array.new(STACK_DEPTH, 0)
        @ports = Array.new(1024)
        @image = Array.new(IMAGE_SIZE, 0)
        @dev_output = ""
        @skip = 0
        init_vm
    end

    public

    def load_image
        if File.exist?(IMAGE_FILE)
            restore_image
        else
            load_default_image
        end
    end

    def run
        @run = true
        while @run
            CYCLES_PER.downto(0) do
                process_opcode
                check_stack
                @ip += 1

                if @ports[3] == 0
                    @ports[3] = 1
                    @out.write(@dev_output)
                    @dev_output = ""
                end
            end
        end
    end

    private

    def process_opcode
        op = @image[@ip]
        case op
        when VM_NOP
        when VM_LIT
            @sp += 1; @ip += 1; @data[@sp] = @image[@ip]
        when VM_DUP
            @sp += 1; @data[@sp] = @data[@sp-1]
        when VM_DROP
            @data[@sp] = 0; @sp -= 1
        when VM_SWAP
            x = @data[@sp]
            y = @data[@sp-1]
            @data[@sp] = y
            @data[@sp-1] = x
        when VM_PUSH
            @rsp += 1
            @address[@rsp] = @data[@sp]
            @sp -= 1
        when VM_POP
            @sp += 1
            @data[@sp] = @address[@rsp]
            @rsp -= 1
        when VM_CALL
            @ip += 1; @rsp += 1
            @address[@rsp] = @ip
            @ip = @image[@ip] - 1
        when VM_JUMP
            @ip += 1
            @ip = @image[@ip] - 1
        when VM_RETURN
            @ip = @address[@rsp]; @rsp -= 1
        when VM_GT_JUMP
            @ip += 1
            if @data[@sp-1] > @data[@sp]
               @ip = @image[@ip] - 1
            end
            @sp -= 2
        when VM_LT_JUMP
            @ip += 1
            if @data[@sp-1] < @data[@sp]
                @ip = @image[@ip] - 1
            end
            @sp -= 2
        when VM_NE_JUMP
            @ip += 1
            if @data[@sp-1] != @data[@sp]
                @ip = @image[@ip] - 1
            end
            @sp -= 2
        when VM_EQ_JUMP
            @ip += 1
            if @data[@sp-1] == @data[@sp]
                @ip = @image[@ip] - 1
            end
            @sp -= 2
        when VM_FETCH
            x = @data[@sp]
            @data[@sp] = @image[x]
        when VM_STORE
            @image[@data[@sp]] = @data[@sp-1]
            @sp -= 2
        when VM_ADD
            @data[@sp-1] += @data[@sp]; @data[@sp] = 0; @sp -= 1
        when VM_SUB
            @data[@sp-1] -= @data[@sp]; @data[@sp] = 0; @sp -= 1
        when VM_MUL
            @data[@sp-1] *= @data[@sp]; @data[@sp] = 0; @sp -= 1
        when VM_DIVMOD
            x = @data[@sp]
            y = @data[@sp-1]
            @data[@sp] = y / x
            @data[@sp-1] = y % x
        when VM_AND
            x = @data[@sp]
            y = @data[@sp-1]
            @sp -= 1
            @data[@sp] = x & y
        when VM_OR
            x = @data[@sp]
            y = @data[@sp-1]
            @sp -= 1
            @data[@sp] = x | y
        when VM_XOR
            x = @data[@sp]
            y = @data[@sp-1]
            @sp -= 1
            @data[@sp] = x ^ y
        when VM_SHL
            x = @data[@sp]
            y = @data[@sp-1]
            @sp -= 1
            @data[@sp] = (y << x)
        when VM_SHR
            x = @data[@sp]
            y = @data[@sp-1]
            @sp -= 1
            @data[@sp] = (y >> x)
        when VM_ZERO_EXIT
            if @data[@sp] == 0
                @sp -= 1
                @ip = @address[@rsp]; @rsp -= 1
            end
        when VM_INC
            @data[@sp] += 1
        when VM_DEC
            @data[@sp] -= 1
        when VM_IN
            x = @data[@sp]
            @data[@sp] = @ports[x]
            @ports[x] = 0
        when VM_OUT
            @ports[0] = 0
            @ports[@data[@sp]] = @data[@sp-1]
            @sp -= 2
        when VM_WAIT
            handle_devices
        else
            raise "Incorrect opcode"
            @ip = IMAGE_SIZE
            @run = 0
        end
    end

    def save_image
        File.open(IMAGE_FILE, "w") do |f|
            f.write(@image.pack("i*"))
        end
    end

    def restore_image
        File.open(IMAGE_FILE, "r") do |f|
            @image = f.read.unpack("i*")
        end
    end

    def handle_devices
        # Port 0: Wait for hardware event, set to 0 to wait
        # Port 1: Read input, set port 0 to wait then read the key value 
        #         from this port
        # Port 2: Generate output, reads data from the stack
        # Port 3: Force video update
        # Port 4: Save image
        # Port 5: Query hardware capability
        #           -1 Amount of memory being provided
        #           -2 Address of framebuffer (0 if none)
        #           -3 Width of framebuffer
        #           -4 Height of framebuffer
        #           -5 Depth of data stack
        #           -6 Depth of address (return) stack

        return if @ports[0] == 1

        # Input
        if @ports[0] == 0 and @ports[1] == 1
            @ports[0] = 1
            c = @in.getc
            exit! if c == nil # eof
            c = 32 if c == 10 # replace '\n' with ' '
            @ports[1] = c
            @skip += 1
        end

        # Output
        if @ports[2] == 1
            if @data[@sp] < 0
                clear_display
            else
                # The program image replies back the input characters
                # This is a hack to not display characters twice
                if @skip > 0
                    @skip -= 1
                else
                    @dev_output += @data[@sp].chr
                end
            end

            @sp -= 1
            @ports[2] = 0
            @ports[0] = 1
        end

        # Save
        if @ports[4] == 1
            save_image
            @ports[4] = 0
            @ports[0] = 1
        end

        # Capabilities
        if @ports[5] == -1
            @ports[5] = IMAGE_SIZE
            @ports[0] = 1
        elsif [-2, -3, -4].include?(@ports[5])
            @ports[5] = 0
            @ports[0] = 1
        elsif @ports[5] == -5
            @ports[5] = @sp
            @port[0] = 1
        elsif @ports[5] == -6
            @ports[5] = @rsp
            @port[0] = 1
        end

    end

    def clear_display
        @dev_output = ""
        `clear`
    end

    def check_stack
        if @sp < 0 or @rsp < 0
            raise "Stack underflow"
            @ip = IMAGE_SIZE
            @run = false
        elsif @sp > STACK_DEPTH or @rsp > STACK_DEPTH
            raise "Stack overflow"
            @ip = IMAGE_SIZE
            @run = false
        end 
    end

    def init_vm
        @ip  = 0
        @sp  = 0
        @rsp = 0
        @ports[0] = 0
        @data[0] = 0
    end

    public

    def load_default_image
        # See Retro to know how this image is generated
        @image[0]=8
        @image[1]=1678
        @image[3]=82
        @image[4]=69
        @image[5]=84
        @image[6]=82
        @image[7]=79
        @image[8]=32
        @image[9]=49
        @image[10]=48
        @image[12]=87
        @image[13]=111
        @image[14]=114
        @image[15]=100
        @image[16]=32
        @image[17]=78
        @image[18]=111
        @image[19]=116
        @image[20]=32
        @image[21]=70
        @image[22]=111
        @image[23]=117
        @image[24]=110
        @image[25]=100
        @image[27]=111
        @image[28]=107
        @image[29]=32
        @image[31]=2549
        @image[34]=8192
        @image[37]=2
        @image[38]=9
        @image[41]=26
        @image[42]=9
        @image[45]=27
        @image[46]=9
        @image[49]=4
        @image[50]=9
        @image[53]=3
        @image[54]=9
        @image[57]=20
        @image[58]=9
        @image[61]=21
        @image[62]=9
        @image[65]=22
        @image[66]=9
        @image[69]=14
        @image[70]=9
        @image[73]=15
        @image[74]=9
        @image[77]=16
        @image[78]=9
        @image[81]=17
        @image[82]=9
        @image[85]=18
        @image[86]=9
        @image[89]=19
        @image[90]=9
        @image[93]=23
        @image[94]=9
        @image[97]=24
        @image[98]=9
        @image[101]=29
        @image[102]=9
        @image[105]=28
        @image[106]=9
        @image[109]=1
        @image[111]=1
        @image[113]=29
        @image[114]=30
        @image[115]=9
        @image[118]=4
        @image[119]=3
        @image[120]=9
        @image[123]=5
        @image[124]=2
        @image[125]=6
        @image[126]=4
        @image[127]=9
        @image[130]=3
        @image[131]=3
        @image[132]=9
        @image[135]=1
        @image[136]=-1
        @image[137]=22
        @image[138]=9
        @image[141]=5
        @image[142]=4
        @image[143]=6
        @image[144]=4
        @image[145]=9
        @image[148]=4
        @image[149]=5
        @image[150]=4
        @image[151]=6
        @image[152]=9
        @image[155]=2
        @image[156]=8
        @image[157]=146
        @image[160]=7
        @image[161]=121
        @image[162]=8
        @image[163]=121
        @image[166]=1
        @image[167]=-1
        @image[168]=4
        @image[169]=15
        @image[170]=9
        @image[173]=1
        @image[175]=4
        @image[176]=15
        @image[177]=9
        @image[180]=19
        @image[181]=8
        @image[182]=116
        @image[185]=19
        @image[186]=3
        @image[187]=9
        @image[190]=1
        @image[191]=-1
        @image[192]=18
        @image[193]=9
        @image[196]=27
        @image[197]=5
        @image[198]=9
        @image[201]=2
        @image[202]=26
        @image[203]=4
        @image[204]=14
        @image[205]=9
        @image[208]=2
        @image[209]=26
        @image[210]=5
        @image[211]=15
        @image[212]=6
        @image[213]=9
        @image[216]=2
        @image[217]=5
        @image[218]=14
        @image[219]=16
        @image[220]=6
        @image[221]=15
        @image[222]=9
        @image[225]=2
        @image[226]=5
        @image[227]=14
        @image[228]=4
        @image[229]=17
        @image[230]=6
        @image[231]=15
        @image[232]=9
        @image[235]=1
        @image[236]=34
        @image[237]=14
        @image[238]=9
        @image[241]=7
        @image[242]=233
        @image[243]=15
        @image[244]=7
        @image[245]=233
        @image[246]=26
        @image[247]=1
        @image[248]=34
        @image[249]=15
        @image[250]=9
        @image[253]=1
        @image[254]=33
        @image[255]=14
        @image[256]=1
        @image[258]=12
        @image[259]=263
        @image[260]=6
        @image[261]=3
        @image[262]=9
        @image[264]=9
        @image[267]=1
        @image[268]=-1
        @image[269]=1
        @image[270]=33
        @image[271]=15
        @image[272]=9
        @image[275]=1
        @image[277]=1
        @image[278]=33
        @image[279]=15
        @image[280]=9
        @image[283]=7
        @image[284]=251
        @image[285]=1
        @image[286]=9
        @image[287]=8
        @image[288]=239
        @image[291]=7
        @image[292]=251
        @image[293]=7
        @image[294]=281
        @image[295]=8
        @image[296]=273
        @image[299]=2
        @image[300]=14
        @image[301]=25
        @image[302]=7
        @image[303]=239
        @image[304]=26
        @image[305]=8
        @image[306]=299
        @image[309]=7
        @image[310]=297
        @image[311]=3
        @image[312]=1
        @image[314]=8
        @image[315]=239
        @image[318]=7
        @image[319]=251
        @image[320]=1
        @image[321]=5
        @image[322]=8
        @image[323]=239
        @image[326]=7
        @image[327]=251
        @image[328]=1
        @image[329]=6
        @image[330]=8
        @image[331]=239
        @image[334]=1
        @image[335]=7
        @image[336]=7
        @image[337]=239
        @image[338]=8
        @image[339]=239
        @image[342]=1
        @image[343]=1
        @image[344]=7
        @image[345]=239
        @image[346]=8
        @image[347]=239
        @image[350]=7
        @image[351]=233
        @image[352]=1
        @image[353]=5
        @image[354]=8
        @image[355]=239
        @image[358]=1
        @image[359]=6
        @image[360]=7
        @image[361]=239
        @image[362]=1
        @image[363]=27
        @image[364]=7
        @image[365]=239
        @image[366]=1
        @image[367]=25
        @image[368]=7
        @image[369]=239
        @image[370]=1
        @image[371]=8
        @image[372]=7
        @image[373]=239
        @image[374]=8
        @image[375]=239
        @image[378]=7
        @image[379]=251
        @image[380]=1
        @image[381]=12
        @image[382]=7
        @image[383]=239
        @image[384]=7
        @image[385]=233
        @image[386]=1
        @image[388]=8
        @image[389]=239
        @image[392]=7
        @image[393]=251
        @image[394]=1
        @image[395]=11
        @image[396]=7
        @image[397]=239
        @image[398]=7
        @image[399]=233
        @image[400]=1
        @image[402]=8
        @image[403]=239
        @image[406]=7
        @image[407]=251
        @image[408]=1
        @image[409]=10
        @image[410]=7
        @image[411]=239
        @image[412]=7
        @image[413]=233
        @image[414]=1
        @image[416]=8
        @image[417]=239
        @image[420]=7
        @image[421]=251
        @image[422]=1
        @image[423]=13
        @image[424]=7
        @image[425]=239
        @image[426]=7
        @image[427]=233
        @image[428]=1
        @image[430]=8
        @image[431]=239
        @image[434]=7
        @image[435]=251
        @image[436]=7
        @image[437]=233
        @image[438]=4
        @image[439]=15
        @image[440]=1
        @image[442]=8
        @image[443]=239
        @image[446]=7
        @image[447]=251
        @image[448]=8
        @image[449]=233
        @image[452]=7
        @image[453]=251
        @image[454]=1
        @image[455]=8
        @image[456]=7
        @image[457]=239
        @image[458]=8
        @image[459]=239
        @image[462]=7
        @image[463]=251
        @image[464]=1
        @image[465]=25
        @image[466]=8
        @image[467]=239
        @image[470]=1
        @image[471]=33
        @image[472]=14
        @image[473]=1
        @image[474]=-1
        @image[475]=12
        @image[476]=483
        @image[477]=1
        @image[478]=7
        @image[479]=7
        @image[480]=239
        @image[481]=8
        @image[482]=239
        @image[484]=8
        @image[485]=194
        @image[488]=2
        @image[489]=14
        @image[490]=1
        @image[492]=13
        @image[493]=496
        @image[494]=8
        @image[495]=468
        @image[497]=1
        @image[498]=33
        @image[499]=14
        @image[500]=1
        @image[501]=-1
        @image[502]=12
        @image[503]=509
        @image[504]=26
        @image[505]=26
        @image[506]=14
        @image[507]=8
        @image[508]=239
        @image[510]=8
        @image[511]=194
        @image[514]=8
        @image[515]=194
        @image[518]=1
        @image[519]=33
        @image[520]=14
        @image[521]=1
        @image[522]=-1
        @image[523]=12
        @image[524]=531
        @image[525]=1
        @image[526]=1
        @image[527]=7
        @image[528]=239
        @image[529]=7
        @image[530]=239
        @image[532]=9
        @image[538]=-1
        @image[541]=1
        @image[542]=538
        @image[543]=14
        @image[544]=25
        @image[545]=3
        @image[546]=1
        @image[548]=1
        @image[549]=3
        @image[550]=29
        @image[551]=9
        @image[554]=1
        @image[556]=1
        @image[557]=533
        @image[558]=15
        @image[559]=1
        @image[560]=534
        @image[561]=14
        @image[562]=1
        @image[563]=16
        @image[564]=16
        @image[565]=1
        @image[566]=534
        @image[567]=15
        @image[568]=9
        @image[571]=1
        @image[572]=533
        @image[573]=14
        @image[574]=1
        @image[575]=16
        @image[576]=16
        @image[577]=2
        @image[578]=1
        @image[579]=533
        @image[580]=15
        @image[581]=1
        @image[582]=536
        @image[583]=14
        @image[584]=11
        @image[585]=588
        @image[586]=7
        @image[587]=552
        @image[589]=9
        @image[592]=2
        @image[593]=1
        @image[594]=10
        @image[595]=12
        @image[596]=601
        @image[597]=7
        @image[598]=552
        @image[599]=3
        @image[600]=9
        @image[602]=2
        @image[603]=1
        @image[604]=13
        @image[605]=12
        @image[606]=611
        @image[607]=7
        @image[608]=552
        @image[609]=3
        @image[610]=9
        @image[612]=5
        @image[613]=1
        @image[614]=533
        @image[615]=14
        @image[616]=1
        @image[617]=534
        @image[618]=14
        @image[619]=6
        @image[620]=1
        @image[621]=1
        @image[622]=1
        @image[623]=2
        @image[624]=29
        @image[625]=7
        @image[626]=107
        @image[627]=7
        @image[628]=569
        @image[629]=8
        @image[630]=539
        @image[633]=1
        @image[634]=1
        @image[635]=1
        @image[636]=2
        @image[637]=29
        @image[638]=7
        @image[639]=107
        @image[640]=8
        @image[641]=539
        @image[644]=1
        @image[645]=10
        @image[646]=8
        @image[647]=631
        @image[650]=1
        @image[651]=535
        @image[652]=14
        @image[653]=1
        @image[655]=13
        @image[656]=659
        @image[657]=8
        @image[658]=590
        @image[660]=8
        @image[661]=631
        @image[664]=1
        @image[665]=535
        @image[666]=14
        @image[667]=1
        @image[669]=13
        @image[670]=673
        @image[671]=8
        @image[672]=552
        @image[674]=8
        @image[675]=642
        @image[678]=1
        @image[679]=-1
        @image[680]=7
        @image[681]=648
        @image[682]=1
        @image[684]=1
        @image[685]=533
        @image[686]=15
        @image[687]=1
        @image[689]=1
        @image[690]=534
        @image[691]=15
        @image[692]=9
        @image[695]=7
        @image[696]=199
        @image[697]=25
        @image[698]=7
        @image[699]=648
        @image[700]=8
        @image[701]=695
        @image[704]=1
        @image[705]=538
        @image[706]=7
        @image[707]=171
        @image[708]=7
        @image[709]=693
        @image[710]=3
        @image[711]=1
        @image[712]=538
        @image[713]=7
        @image[714]=164
        @image[715]=8
        @image[716]=539
        @image[721]=9
        @image[724]=1
        @image[725]=1
        @image[726]=1
        @image[727]=1
        @image[728]=29
        @image[729]=7
        @image[730]=107
        @image[731]=1
        @image[732]=1
        @image[733]=28
        @image[734]=2
        @image[735]=1
        @image[737]=13
        @image[738]=741
        @image[739]=8
        @image[740]=719
        @image[742]=3
        @image[743]=8
        @image[744]=724
        @image[747]=1
        @image[748]=6144
        @image[749]=1
        @image[750]=717
        @image[751]=14
        @image[752]=16
        @image[753]=15
        @image[754]=9
        @image[757]=1
        @image[758]=1
        @image[759]=1
        @image[760]=717
        @image[761]=8
        @image[762]=214
        @image[765]=7
        @image[766]=722
        @image[767]=2
        @image[768]=7
        @image[769]=648
        @image[770]=2
        @image[771]=1
        @image[772]=718
        @image[773]=14
        @image[774]=13
        @image[775]=780
        @image[776]=7
        @image[777]=745
        @image[778]=8
        @image[779]=755
        @image[781]=3
        @image[782]=8
        @image[783]=765
        @image[786]=7
        @image[787]=722
        @image[788]=2
        @image[789]=7
        @image[790]=648
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end

if __FILE__ == $0
    vm = RetroVM.new
    vm.load_image
    vm.run
end