# read-byte-buffered: one higher-level abstraction atop 'read'. # # There are many situations where 'read' is a lot to manage, and we need # to abstract some details away. One of them is when we want to read a file # character by character. In this situation we follow C's FILE data structure, # which manages the underlying file descriptor together with the buffer it # reads into. We call our version 'buffered-file'. Should be useful with other # primitives as well, in later layers. == data # The buffered file for standard input. Also illustrates the layout for # buffered-file: a pointer to the backing store, followed by a 'buffer' stream Stdin: # buffered-file # file descriptor or (addr stream byte) 0/imm32 # standard input $Stdin->buffer: # inlined fields for a stream # current write index 0/imm32 # current read index 0/imm32 # size 8/imm32 # data 00 00 00 00 00 00 00 00 # 8 bytes # TODO: 8 bytes is too small. We'll need to grow the buffer for efficiency. But # I don't want to type in 1024 bytes here. == code # instruction effective address register displacement immediate # . op subop mod rm32 base index scale r32 # . 1-3 bytes 3 bits 2 bits 3 bits 3 bits 3 bits 2 bits 2 bits 0/1/2/4 bytes 0/1/2/4 bytes # Return next byte value in eax, with top 3 bytes cleared. # On reaching end of file, return 0xffffffff (Eof). read-byte-buffered: # f: (addr buffered-file) -> byte-or-Eof/eax: byte # . prologue 55/push-ebp 89/copy 3/mod/direct 5/rm32/ebp . . . 4/r32/esp . . # copy esp to ebp # . save registers 51/push-ecx 56/push-esi # esi = f 8b/copy 1/mod/*+disp8 5/rm32/ebp . . . 6/r32/esi 8/disp8 . # copy *(ebp+8) to esi # ecx = f->read 8b/copy 1/mod/*+disp8 6/rm32/esi . . . 1/r32/ecx 8/disp8 . # copy *(esi+8) to ecx # if (f->read >= f->write) populate stream from file 3b/compare 1/mod/*+disp8 6/rm32/esi . . . 1/r32/ecx 4/disp8 . # compare ecx with *(esi+4) 7c/jump-if-< $read-byte-buffered:from-stream/disp8 # . clear-stream(stream = f+4) # . . push args 8d/copy-address 1/mod/*+disp8 6/rm32/esi . . . 0/r32/eax 4/disp8 . # copy esi+4 to eax 50/push-eax # . . call e8/call clear-stream/disp32 # . . discard args 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp # . f->read must now be 0; update its cache at ecx 31/xor 3/mod/direct 1/rm32/ecx . . . 1/r32/ecx . . # clear ecx # . eax = read(f->fd, stream = f+4) # . . push args 50/push-eax ff 6/subop/push 0/mod/indirect 6/rm32/esi . . . . . . # push *esi # . . call e8/call read/disp32 # . . discard args 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp # if (eax == 0) return 0xffffffff 3d/compare-eax-and 0/imm32 75/jump-if-!= $read-byte-buffered:from-stream/disp8 b8/copy-to-eax 0xffffffff/imm32/Eof eb/jump $read-byte-buffered:end/disp8 $read-byte-buffered:from-stream: # byte-or-Eof = f->data[f->read] 31/xor 3/mod/direct 0/rm32/eax . . . 0/r32/eax . . # clear eax 8a/copy-byte 1/mod/*+disp8 4/rm32/sib 6/base/esi 1/index/ecx . 0/r32/AL 0x10/disp8 . # copy byte at *(esi+ecx+16) to AL # ++f->read ff 0/subop/increment 1/mod/*+disp8 6/rm32/esi . . . . 8/disp8 . # increment *(esi+8) $read-byte-buffered:end: # . restore registers 5e/pop-to-esi 59/pop-to-ecx # . epilogue 89/copy 3/mod/direct 4/rm32/esp . . . 5/r32/ebp . . # copy ebp to esp 5d/pop-to-ebp c3/return # - tests test-read-byte-buffered-single: # - check that read-byte-buffered returns first byte of 'file' # setup # . clear-stream(_test-stream) # . . push args 68/push _test-stream/imm32 # . . call e8/call clear-stream/disp32 # . . discard args 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp # . clear-stream(_test-buffered-file->buffer) # . . push args 68/push $_test-buffered-file->buffer/imm32 # . . call e8/call clear-stream/disp32 # . . discard args 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp # . write(_test-stream, "Ab") # . . push args 68/push "Ab"/imm32 68/push _test-stream/imm32 # . . call e8/call write/disp32 # . . discard args 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp # read-byte-buffered(_test-buffered-file) # . . push args 68/push _test-buffered-file/imm32 # . . call e8/call read-byte-buffered/disp32 # . . discard args 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp # check-ints-equal(eax, 'A', msg) # . . push args 68/push "F - test-read-byte-buffered-single"/imm32 68/push 0x41/imm32 50/push-eax # . . call e8/call check-ints-equal/disp32 # . . discard args 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 0xc/imm32 # add to esp # . end c3/return test-read-byte-buffered-multiple: # - call read-byte-buffered twice, check that second call returns second byte # setup # . clear-stream(_test-stream) # . . push args 68/push _test-stream/imm32 # . . call e8/call clear-stream/disp32 # . . discard args 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp # . clear-stream($_test-buffered-file->buffer) # . . push args 68/push $_test-buffered-file->buffer/imm32 # . . call e8/call clear-stream/disp32 # . . discard args 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp # . write(_test-stream, "Ab") # . . push args 68/push "Ab"/imm32 68/push _test-stream/imm32 # . . call e8/call write/disp32 # . . discard args 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp # read-byte-buffered(_test-buffered-file) # . . push args 68/push _test-buffered-file/imm32 # . . call e8/call read-byte-buffered/disp32 # . . discard args 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp # read-byte-buffered(_test-buffered-file) # . . push args 68/push _test-buffered-file/imm32 # . . call e8/call read-byte-buffered/disp32 # . . discard args 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp # check-ints-equal(eax, 'b', msg) # . . push args 68/push "F - test-read-byte-buffered-multiple"/imm32 68/push 0x62/imm32 50/push-eax # . . call e8/call check-ints-equal/disp32 # . . discard args 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 0xc/imm32 # add to esp # . end c3/return test-read-byte-buffered-end-of-file: # - call read-byte-buffered on an empty 'file', check that it returns Eof # setup # . clear-stream(_test-stream) # . . push args 68/push _test-stream/imm32 # . . call e8/call clear-stream/disp32 # . . discard args 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp # . clear-stream($_test-buffered-file->buffer) # . . push args 68/push $_test-buffered-file->buffer/imm32 # . . call e8/call clear-stream/disp32 # . . discard args 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp # read-byte-buffered(_test-buffered-file) # . . push args 68/push _test-buffered-file/imm32 # . . call e8/call read-byte-buffered/disp32 # . . discard args 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp # check-ints-equal(eax, 0xffffffff, msg) # . . push args 68/push "F - test-read-byte-buffered-end-of-file"/imm32 68/push 0xffffffff/imm32/Eof 50/push-eax # . . call e8/call check-ints-equal/disp32 # . . discard args 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 0xc/imm32 # add to esp # . end c3/return test-read-byte-buffered-refills-buffer: # - consume buffered-file's buffer, check that next read-byte-buffered still works # setup # . clear-stream(_test-stream) # . . push args 68/push _test-stream/imm32 # . . call e8/call clear-stream/disp32 # . . discard args 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp # . clear-stream($_test-buffered-file->buffer) # . . push args 68/push $_test-buffered-file->buffer/imm32 # . . call e8/call clear-stream/disp32 # . . discard args 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp # . write(_test-stream, "Abcdefgh") # . . push args 68/push "Abcdefgh"/imm32 68/push _test-stream/imm32 # . . call e8/call write/disp32 # . . discard args 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp # pretend buffer is full # . _test-buffered-file->read = 6 # >= _test-buffered-file->size b8/copy-to-eax _test-buffered-file/imm32 c7 0/subop/copy 1/mod/*+disp8 0/rm32/eax . . . . 8/disp8 6/imm32 # copy to *(eax+8) # read-byte-buffered(_test-buffered-file) # . . push args 68/push _test-buffered-file/imm32 # . . call e8/call read-byte-buffered/disp32 # . . discard args 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp # check-ints-equal(eax, 'A', msg) # . . push args 68/push "F - test-read-byte-buffered-refills-buffer"/imm32 68/push 0x41/imm32 50/push-eax # . . call e8/call check-ints-equal/disp32 # . . discard args 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 0xc/imm32 # add to esp # . end c3/return # Return next byte value in eax, with top 3 bytes cleared. # Abort on reaching end of stream. read-byte: # s: (addr stream byte) -> result/eax: byte # . prologue 55/push-ebp 89/copy 3/mod/direct 5/rm32/ebp . . . 4/r32/esp . . # copy esp to ebp # . save registers 51/push-ecx 56/push-esi # esi = s 8b/copy 1/mod/*+disp8 5/rm32/ebp . . . 6/r32/esi 8/disp8 . # copy *(ebp+8) to esi # ecx = s->read 8b/copy 1/mod/*+disp8 6/rm32/esi . . . 1/r32/ecx 4/disp8 . # copy *(esi+4) to ecx # if (f->read >= f->write) abort 3b/compare 0/mod/indirect 6/rm32/esi . . . 1/r32/ecx . . # compare ecx with *esi 0f 8d/jump-if->= $read-byte:abort/disp32 # result = f->data[f->read] 31/xor 3/mod/direct 0/rm32/eax . . . 0/r32/eax . . # clear eax 8a/copy-byte 1/mod/*+disp8 4/rm32/sib 6/base/esi 1/index/ecx . 0/r32/AL 0xc/disp8 . # copy byte at *(esi+ecx+12) to AL # ++f->read ff 0/subop/increment 1/mod/*+disp8 6/rm32/esi . . . . 4/disp8 . # increment *(esi+4) $read-byte:end: # . restore registers 5e/pop-to-esi 59/pop-to-ecx # . epilogue 89/copy 3/mod/direct 4/rm32/esp . . . 5/r32/ebp . . # copy ebp to esp 5d/pop-to-ebp c3