316 lines
7.8 KiB
Plaintext
316 lines
7.8 KiB
Plaintext
# Some unsafe methods not intended to be used directly in SubX, only through
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# Mu after proper type-checking.
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== code
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stream-empty?: # s: (addr stream _) -> result/eax: boolean
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# . prologue
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55/push-ebp
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89/<- %ebp 4/r32/esp
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# . save registers
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51/push-ecx
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56/push-esi
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# result = false
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b8/copy-to-eax 0/imm32/false
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# esi = s
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8b/-> *(ebp+8) 6/r32/esi
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# return s->read >= s->write
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8b/-> *esi 1/r32/ecx
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39/compare-with *(esi+4) 1/r32/ecx
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0f 9d/set-if->= %al
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$stream-empty?:end:
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# . restore registers
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5e/pop-to-esi
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59/pop-to-ecx
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# . epilogue
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89/<- %esp 5/r32/ebp
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5d/pop-to-ebp
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c3/return
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stream-full?: # s: (addr stream _) -> result/eax: boolean
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# . prologue
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55/push-ebp
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89/<- %ebp 4/r32/esp
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# . save registers
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51/push-ecx
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56/push-esi
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# result = false
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b8/copy-to-eax 0/imm32/false
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# esi = s
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8b/-> *(ebp+8) 6/r32/esi
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# return s->write >= s->size
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8b/-> *(esi+8) 1/r32/ecx
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39/compare-with *esi 1/r32/ecx
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0f 9d/set-if->= %al
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$stream-full?:end:
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# . restore registers
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5e/pop-to-esi
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59/pop-to-ecx
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# . epilogue
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89/<- %esp 5/r32/ebp
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5d/pop-to-ebp
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c3/return
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write-to-stream: # s: (addr stream _), in: (addr byte), n: int
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# . prologue
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55/push-ebp
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89/<- %ebp 4/r32/esp
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# . save registers
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50/push-eax
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51/push-ecx
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52/push-edx
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53/push-ebx
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57/push-edi
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# edi = s
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8b/-> *(ebp+8) 7/r32/edi
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# var swrite/edx: int = s->write
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8b/-> *edi 2/r32/edx
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# if (swrite + n > s->size) abort
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8b/-> *(ebp+0x10) 1/r32/ecx
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01/add-to %ecx 2/r32/edx
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3b/compare 1/r32/ecx *(edi+8)
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0f 8f/jump-if-> $write-to-stream:abort/disp32
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# var out/edx: (addr byte) = s->data + s->write
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8d/copy-address *(edi+edx+0xc) 2/r32/edx
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# var outend/ebx: (addr byte) = out + n
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8b/-> *(ebp+0x10) 3/r32/ebx
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8d/copy-address *(edx+ebx) 3/r32/ebx
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# eax = in
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8b/-> *(ebp+0xc) 0/r32/eax
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# var inend/ecx: (addr byte) = in + n
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8b/-> *(ebp+0x10) 1/r32/ecx
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8d/copy-address *(eax+ecx) 1/r32/ecx
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#
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(_append-4 %edx %ebx %eax %ecx) # => eax
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# s->write += n
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8b/-> *(ebp+0x10) 1/r32/ecx
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01/add-to *edi 1/r32/ecx
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$write-to-stream:end:
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# . restore registers
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5f/pop-to-edi
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5b/pop-to-ebx
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5a/pop-to-edx
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59/pop-to-ecx
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58/pop-to-eax
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# . epilogue
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89/<- %esp 5/r32/ebp
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5d/pop-to-ebp
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c3/return
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$write-to-stream:abort:
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(abort "write-to-stream: stream full")
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# never gets here
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read-from-stream: # s: (addr stream _), out: (addr byte), n: int
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# . prologue
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55/push-ebp
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89/<- %ebp 4/r32/esp
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# . save registers
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50/push-eax
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51/push-ecx
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52/push-edx
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53/push-ebx
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56/push-esi
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# esi = s
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8b/-> *(ebp+8) 6/r32/esi
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# var sread/edx: int = s->read
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8b/-> *(esi+4) 2/r32/edx
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# if (sread + n > s->write) abort
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8b/-> *(ebp+0x10) 1/r32/ecx
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01/add-to %ecx 2/r32/edx
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3b/compare 1/r32/ecx *esi
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0f 8f/jump-if-> $read-from-stream:abort/disp32
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# var in/edx: (addr byte) = s->data + s->read
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8d/copy-address *(esi+edx+0xc) 2/r32/edx
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# var inend/ebx: (addr byte) = in + n
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8b/-> *(ebp+0x10) 3/r32/ebx
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8d/copy-address *(edx+ebx) 3/r32/ebx
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# eax = out
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8b/-> *(ebp+0xc) 0/r32/eax
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# var outend/ecx: (addr byte) = out + n
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8b/-> *(ebp+0x10) 1/r32/ecx
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8d/copy-address *(eax+ecx) 1/r32/ecx
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#
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(_append-4 %eax %ecx %edx %ebx) # => eax
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# s->read += n
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8b/-> *(ebp+0x10) 1/r32/ecx
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01/add-to *(esi+4) 1/r32/ecx
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$read-from-stream:end:
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# . restore registers
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5e/pop-to-esi
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5b/pop-to-ebx
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5a/pop-to-edx
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59/pop-to-ecx
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58/pop-to-eax
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# . epilogue
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89/<- %esp 5/r32/ebp
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5d/pop-to-ebp
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c3/return
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$read-from-stream:abort:
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(abort "read-from-stream: stream empty")
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# never gets here
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stream-first: # s: (addr stream byte) -> result/eax: byte
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# . prologue
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55/push-ebp
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89/<- %ebp 4/r32/esp
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# . save registers
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51/push-ecx
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56/push-esi
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# result = false
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b8/copy-to-eax 0/imm32
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# esi = s
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8b/-> *(ebp+8) 6/r32/esi
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# var idx/ecx: int = s->read
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8b/-> *(esi+4) 1/r32/ecx
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# if idx >= s->write return 0
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3b/compare-with 1/r32/ecx *esi
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7d/jump-if->= $stream-first:end/disp8
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# result = s->data[idx]
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8a/byte-> *(esi+ecx+0xc) 0/r32/AL
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$stream-first:end:
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# . restore registers
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5e/pop-to-esi
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59/pop-to-ecx
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# . epilogue
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89/<- %esp 5/r32/ebp
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5d/pop-to-ebp
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c3/return
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stream-final: # s: (addr stream byte) -> result/eax: byte
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# . prologue
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55/push-ebp
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89/<- %ebp 4/r32/esp
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# . save registers
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51/push-ecx
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56/push-esi
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# result = false
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b8/copy-to-eax 0/imm32
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# esi = s
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8b/-> *(ebp+8) 6/r32/esi
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# var max/ecx: int = s->write
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8b/-> *esi 1/r32/ecx
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# if s->read >= max return 0
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39/compare-with *(esi+4) 1/r32/ecx
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7d/jump-if->= $stream-final:end/disp8
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# var idx/ecx: int = max - 1
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49/decrement-ecx
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# result = s->data[idx]
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8a/byte-> *(esi+ecx+0xc) 0/r32/AL
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$stream-final:end:
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# . restore registers
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5e/pop-to-esi
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59/pop-to-ecx
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# . epilogue
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89/<- %esp 5/r32/ebp
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5d/pop-to-ebp
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c3/return
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# compare all the data in two streams (ignoring the read pointer)
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streams-data-equal?: # a: (addr stream byte), b: (addr array byte) -> result/eax: boolean
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# pseudocode:
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# awrite = a->write
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# if (awrite != b->write) return false
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# i = 0
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# curra = a->data
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# currb = b->data
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# while i < awrite
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# i1 = *curra
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# i2 = *currb
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# if (c1 != c2) return false
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# i+=4, curra+=4, currb+=4
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# return true
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#
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# registers:
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# i: ecx
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# awrite: edx
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# curra: esi
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# currb: edi
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# i1: eax
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# i2: ebx
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#
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# . prologue
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55/push-ebp
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89/<- %ebp 4/r32/esp
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# . save registers
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51/push-ecx
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52/push-edx
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53/push-ebx
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56/push-esi
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57/push-edi
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# esi = a
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8b/-> *(ebp+8) 6/r32/esi
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# edi = b
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8b/-> *(ebp+0xc) 7/r32/edi
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# var awrite/edx: int = a->write
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8b/-> *esi 2/r32/edx
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$streams-data-equal?:sizes:
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# if (awrite != b->write) return false
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39/compare *edi 2/r32/edx
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75/jump-if-!= $streams-data-equal?:false/disp8
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# var curra/esi: (addr byte) = a->data
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81 0/subop/add %esi 0xc/imm32
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# var currb/edi: (addr byte) = b->data
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81 0/subop/add %edi 0xc/imm32
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# var i/ecx: int = 0
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31/xor-with %ecx 1/r32/ecx
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# var vala/eax: int
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31/xor-with %eax 0/r32/eax
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# var valb/ebx: int
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31/xor-with %ebx 3/r32/ebx
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$streams-data-equal?:loop:
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{
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# if (i >= awrite) return true
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39/compare %ecx 2/r32/edx
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7d/jump-if->= $streams-data-equal?:true/disp8
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# var vala/eax: int = *curra
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8a/byte-> *esi 0/r32/eax
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# var valb/ebx: int = *currb
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8a/byte-> *edi 3/r32/ebx
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# if (vala != valb) return false
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39/compare %eax 3/r32/ebx
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75/jump-if-!= $streams-data-equal?:false/disp8
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# i++
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41/increment-ecx
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# curra++
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46/increment-esi
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# currb++
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47/increment-edi
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eb/jump loop/disp8
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}
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$streams-data-equal?:true:
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b8/copy-to-eax 1/imm32
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eb/jump $streams-data-equal?:end/disp8
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$streams-data-equal?:false:
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b8/copy-to-eax 0/imm32
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$streams-data-equal?:end:
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# . restore registers
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5f/pop-to-edi
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5e/pop-to-esi
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5b/pop-to-ebx
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5a/pop-to-edx
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59/pop-to-ecx
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# . epilogue
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89/<- %esp 5/r32/ebp
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5d/pop-to-ebp
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c3/return
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# helper for tests
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check-streams-data-equal: # s: (addr stream _), expected: (addr array _), msg: (addr array byte)
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# . prologue
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55/push-ebp
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89/<- %ebp 4/r32/esp
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# . save registers
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50/push-eax
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#
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(streams-data-equal? *(ebp+8) *(ebp+0xc)) # => eax
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(check-ints-equal %eax 1 *(ebp+0x10))
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$check-streams-data-equal:end:
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# . restore registers
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58/pop-to-eax
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# . epilogue
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89/<- %esp 5/r32/ebp
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5d/pop-to-ebp
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c3/return
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