# Assign addresses (co-ordinates) to instructions (landmarks) in a program
# (landscape).
# Use the addresses assigned to replace labels.
#
# To build:
# $ ./bootstrap translate init.linux [01]*.subx apps/subx-params.subx apps/survey_baremetal.subx -o apps/survey_baremetal
#
# The expected input is a stream of bytes and some interspersed labels.
# Comments and '==' segment headers are allowed, but ignored. The emitted code
# will all lie in a single header, and start at address 0x8800.
# $ cat x
# == code
# l1:
# aa bb l1/imm8
# cc dd l2/disp32
# l2:
# ee foo/imm32
# == data
# foo:
# 00
#
# The output is the stream of bytes without segment headers or label definitions,
# and with label references replaced with numeric values/displacements.
#
# $ cat x |./bootstrap run apps/survey_baremetal
# aa bb nn # some computed address
# cc dd nn nn nn nn # some computed displacement
# ee nn nn nn nn # address right after this instruction
# # data segment interleaved with code
# 00
== 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
Entry: # run tests if necessary, convert stdin if not
# . prologue
89/copy 3/mod/direct 5/rm32/ebp . . . 4/r32/esp . . # copy esp to ebp
# Heap = new-segment(Heap-size)
# . . push args
68/push Heap/imm32
ff 6/subop/push 0/mod/indirect 5/rm32/.disp32 . . . Heap-size/disp32 # push *Heap-size
# . . call
e8/call new-segment/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# initialize-trace-stream(Trace-size)
# . . push args
ff 6/subop/push 0/mod/indirect 5/rm32/.disp32 . . . Trace-size/disp32 # push *Heap-size
# . . call
e8/call initialize-trace-stream/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp
# - if argc > 1 and argv[1] == "test", then return run_tests()
# if (argc <= 1) goto interactive
81 7/subop/compare 1/mod/*+disp8 5/rm32/ebp . . . . 0/disp8 1/imm32 # compare *ebp
7e/jump-if-<= $subx-survey-main:interactive/disp8
# if (!kernel-string-equal?(argv[1], "test")) goto interactive
# . eax = kernel-string-equal?(argv[1], "test")
# . . push args
68/push "test"/imm32
ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp . . . . 8/disp8 . # push *(ebp+8)
# . . call
e8/call kernel-string-equal?/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# . if (eax == false) goto interactive
3d/compare-eax-and 0/imm32/false
74/jump-if-= $subx-survey-main:interactive/disp8
# run-tests()
e8/call run-tests/disp32
# syscall(exit, *Num-test-failures)
8b/copy 0/mod/indirect 5/rm32/.disp32 . . 3/r32/ebx Num-test-failures/disp32 # copy *Num-test-failures to ebx
eb/jump $subx-survey-main:end/disp8
$subx-survey-main:interactive:
# - otherwise convert stdin
# subx-survey(Stdin, Stdout)
# . . push args
68/push Stdout/imm32
68/push Stdin/imm32
# . . call
e8/call subx-survey/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
#? # . write-stream(2/stderr, Trace-stream)
#? # . . push args
#? ff 6/subop/push 0/mod/indirect 5/rm32/.disp32 . . . Trace-stream/disp32 # push *Trace-stream
#? 68/push 2/imm32/stderr
#? # . . call
#? e8/call write-stream/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# syscall(exit, 0)
bb/copy-to-ebx 0/imm32
$subx-survey-main:end:
e8/call syscall_exit/disp32
subx-survey: # infile: (addr buffered-file), out: (addr buffered-file)
# pseudocode
# var in: (stream byte Input-size)
# slurp(infile, in)
# var labels: (stream {label-name, address} Max-labels)
# compute-offsets(in, labels)
# rewind-stream(in)
# emit-output(in, out, labels)
#
# . prologue
55/push-ebp
89/copy 3/mod/direct 5/rm32/ebp . . . 4/r32/esp . . # copy esp to ebp
# . save registers
51/push-ecx
52/push-edx
56/push-esi
# var labels/edx: (stream {label-name, address} Max-labels)
# (we get more rows than Max-labels advertises because row size is smaller than in survey_elf)
# . data
2b/subtract 0/mod/indirect 5/rm32/.disp32 . . 4/r32/esp Max-labels/disp32 # subtract *Max-labels from esp
# . size
ff 6/subop/push 0/mod/indirect 5/rm32/.disp32 . . . Max-labels/disp32 # push *Max-labels
# . read
68/push 0/imm32/read
# . write
68/push 0/imm32/write
89/copy 3/mod/direct 2/rm32/edx . . . 4/r32/esp . . # copy esp to edx
# var in/esi: (stream byte Input-size)
# . data
2b/subtract 0/mod/indirect 5/rm32/.disp32 . . 4/r32/esp Input-size/disp32 # subtract *Input-size from esp
# . size
ff 6/subop/push 0/mod/indirect 5/rm32/.disp32 . . . Input-size/disp32 # push *Input-size
# . read
68/push 0/imm32/read
# . write
68/push 0/imm32/write
89/copy 3/mod/direct 6/rm32/esi . . . 4/r32/esp . . # copy esp to esi
# slurp(infile, in)
# . . push args
56/push-esi
ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp . . . . 8/disp8 . # push *(ebp+8)
# . . call
e8/call slurp/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# compute-offsets(in, labels)
# . . push args
52/push-edx
56/push-esi
# . . call
e8/call compute-offsets/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# rewind-stream(in)
# . . push args
56/push-esi
# . . call
e8/call rewind-stream/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp
# emit-output(in, out, labels)
# . . push args
52/push-edx
ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp . . . . 0xc/disp8 . # push *(ebp+12)
56/push-esi
# . . call
e8/call emit-output/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 0xc/imm32 # add to esp
# flush(out)
# . . push args
ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp . . . . 0xc/disp8 . # push *(ebp+12)
# . . call
e8/call flush/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp
$subx-survey:end:
# . reclaim locals
03/add 0/mod/indirect 5/rm32/.disp32 . . 4/r32/esp Max-labels/disp32 # add *Max-labels to esp
03/add 0/mod/indirect 5/rm32/.disp32 . . 4/r32/esp Input-size/disp32 # add *Input-size to esp
# . restore registers
5e/pop-to-esi
5a/pop-to-edx
59/pop-to-ecx
# . epilogue
89/copy 3/mod/direct 4/rm32/esp . . . 5/r32/ebp . . # copy ebp to esp
5d/pop-to-ebp
c3/return
test-subx-survey-computes-addresses:
# input:
# == code
# Entry:
# ab x/imm32
# == data
# x:
# 01
#
# trace contains (in any order):
# label x is at address 0x8805
#
# . prologue
55/push-ebp
89/copy 3/mod/direct 5/rm32/ebp . . . 4/r32/esp . . # copy esp to ebp
# setup
# . clear-stream(_test-input-stream)
# . . push args
68/push _test-input-stream/imm32
# . . call
e8/call clear-stream/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp
# . clear-stream($_test-input-buffered-file->buffer)
# . . push args
68/push $_test-input-buffered-file->buffer/imm32
# . . call
e8/call clear-stream/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp
# . clear-stream(_test-output-stream)
# . . push args
68/push _test-output-stream/imm32
# . . call
e8/call clear-stream/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp
# . clear-stream($_test-output-buffered-file->buffer)
# . . push args
68/push $_test-output-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
# initialize input
# . write(_test-input-stream, "== code\n")
# . . push args
68/push "== code\n"/imm32
68/push _test-input-stream/imm32
# . . call
e8/call write/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# . write(_test-input-stream, "Entry:\n")
# . . push args
68/push "Entry:\n"/imm32
68/push _test-input-stream/imm32
# . . call
e8/call write/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# . write(_test-input-stream, "ab x/imm32\n")
# . . push args
68/push "ab x/imm32\n"/imm32
68/push _test-input-stream/imm32
# . . call
e8/call write/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# . write(_test-input-stream, "== data\n")
# . . push args
68/push "== data\n"/imm32
68/push _test-input-stream/imm32
# . . call
e8/call write/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# . write(_test-input-stream, "x:\n")
# . . push args
68/push "x:\n"/imm32
68/push _test-input-stream/imm32
# . . call
e8/call write/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# . write(_test-input-stream, "01\n")
# . . push args
68/push "01\n"/imm32
68/push _test-input-stream/imm32
# . . call
e8/call write/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# subx-survey(_test-input-buffered-file, _test-output-buffered-file)
# . . push args
68/push _test-output-buffered-file/imm32
68/push _test-input-buffered-file/imm32
# . . call
e8/call subx-survey/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# check trace
#? # dump *Trace-stream {{{
#? # . write(2/stderr, "^")
#? # . . push args
#? 68/push "^"/imm32
#? 68/push 2/imm32/stderr
#? # . . call
#? e8/call write/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
#? # . write-stream(2/stderr, *Trace-stream)
#? # . . push args
#? ff 6/subop/push 0/mod/indirect 5/rm32/.disp32 . . . Trace-stream/disp32 # push *Trace-stream
#? 68/push 2/imm32/stderr
#? # . . call
#? e8/call write-stream/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
#? # . write(2/stderr, "$\n")
#? # . . push args
#? 68/push "$\n"/imm32
#? 68/push 2/imm32/stderr
#? # . . call
#? e8/call write/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
#? # }}}
# . check-trace-contains("label 'x' is at address 0x00008805.", msg)
# . . push args
68/push "F - test-subx-survey-computes-addresses/0"/imm32
68/push "label 'x' is at address 0x00008805."/imm32
# . . call
e8/call check-trace-contains/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# . epilogue
89/copy 3/mod/direct 4/rm32/esp . . . 5/r32/ebp . . # copy ebp to esp
5d/pop-to-ebp
c3/return
compute-offsets: # in: (addr stream byte), labels: (addr stream {(handle array byte), address})
# pseudocode:
# var current-address = 0x8800
# var line: (stream byte 512)
# while true # line loop
# clear-stream(line)
# read-line(in, line)
# if (line->write == 0) break # end of file
# while true # word loop
# word-slice = next-word(line)
# if slice-empty?(word-slice) # end of line
# break
# else if slice-starts-with?(word-slice, "#") # comment
# break # end of line
# else if slice-equal?(word-slice, "==") # no need for segment header
# break
# else if is-label?(word-slice)
# strip trailing ':' from word-slice
# trace("label '" word-slice "' is at address " current-address ".")
# # labels occupy no space, so no need to increment offsets
# else
# width = compute-width-of-slice(word-slice)
# current-address += width
#
# . prologue
55/push-ebp
89/copy 3/mod/direct 5/rm32/ebp . . . 4/r32/esp . . # copy esp to ebp
# . save registers
50/push-eax
51/push-ecx
52/push-edx
53/push-ebx
56/push-esi
57/push-edi
# var current-address/esi: int = 0x8800
be/copy-to-esi 0x8800/imm32
# var line/ecx: (stream byte 512)
81 5/subop/subtract 3/mod/direct 4/rm32/esp . . . . . 0x200/imm32 # subtract from esp
68/push 0x200/imm32/size
68/push 0/imm32/read
68/push 0/imm32/write
89/copy 3/mod/direct 1/rm32/ecx . . . 4/r32/esp . . # copy esp to ecx
# var word-slice/edx: (addr slice)
68/push 0/imm32
68/push 0/imm32
89/copy 3/mod/direct 2/rm32/edx . . . 4/r32/esp . . # copy esp to edx
$compute-offsets:line-loop:
# clear-stream(line)
# . . push args
51/push-ecx
# . . call
e8/call clear-stream/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp
# read-line(in, line)
# . . push args
51/push-ecx
ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp . . . . 8/disp8 . # push *(ebp+8)
# . . call
e8/call read-line/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# if (line->write == 0) break
8b/copy 0/mod/indirect 1/rm32/ecx . . . 0/r32/eax . . # copy *ecx to eax
3d/compare-eax-and 0/imm32
0f 84/jump-if-= $compute-offsets:end/disp32
#? # dump line {{{
#? # . write(2/stderr, "LL: ")
#? # . . push args
#? 68/push "LL: "/imm32
#? 68/push 2/imm32/stderr
#? # . . call
#? e8/call write/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
#? # write-stream(2/stderr, line)
#? # . . push args
#? 51/push-ecx
#? 68/push 2/imm32/stderr
#? # . . call
#? e8/call write-stream/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
#? # . write(2/stderr, "$\n")
#? # . . push args
#? 68/push "$\n"/imm32
#? 68/push 2/imm32/stderr
#? # . . call
#? e8/call write/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
#? # . rewind-stream(line)
#? # . . push args
#? 51/push-ecx
#? # . . call
#? e8/call rewind-stream/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp
#? # }}}
$compute-offsets:word-loop:
# next-word(line, word-slice)
52/push-edx
51/push-ecx
e8/call next-word/disp32
# . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
$compute-offsets:case-empty:
# if slice-empty?(word-slice) break
# . eax = slice-empty?(word-slice)
52/push-edx
e8/call slice-empty?/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp
# . if (eax != false) break
3d/compare-eax-and 0/imm32/false
0f 85/jump-if-!= $compute-offsets:line-loop/disp32
$compute-offsets:case-comment:
# if slice-starts-with?(word-slice, "#") break
68/push "#"/imm32
52/push-edx
e8/call slice-starts-with?/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# . if (eax != false) break
3d/compare-eax-and 0/imm32/false
0f 85/jump-if-!= $compute-offsets:line-loop/disp32
$compute-offsets:case-segment-header:
# if slice-equal?(word-slice, "==") break
# . eax = slice-equal?(word-slice, "==")
68/push "=="/imm32
52/push-edx
e8/call slice-equal?/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# . if (eax != false) break
3d/compare-eax-and 0/imm32/false
0f 85/jump-if-!= $compute-offsets:line-loop/disp32
$compute-offsets:case-label:
# if (!is-label?(word-slice)) goto next case
# . eax = is-label?(word-slice)
# . . push args
52/push-edx
# . . call
e8/call is-label?/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp
# . if (eax == false) goto next case
3d/compare-eax-and 0/imm32/false
0f 84/jump-if-= $compute-offsets:case-default/disp32
# strip trailing ':' from word-slice
ff 1/subop/decrement 1/mod/*+disp8 2/rm32/edx . . . . 4/disp8 . # decrement *(edx+4)
# var tmp/eax: (addr int) = get-or-insert-slice(labels, word-slice, row-size=12)
# . . push args
68/push Heap/imm32
68/push 0xc/imm32/row-size
52/push-edx
ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp . . . . 0xc/disp8 . # push *(ebp+12)
# . . call
e8/call get-or-insert-slice/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 0x10/imm32 # add to esp
# *tmp = current-address
89/copy 0/mod/indirect 0/rm32/eax . . . 6/r32/esi . . # copy esi to *eax
# trace-slsns("label '" word-slice "' is at address " current-address ".")
# . . push args
68/push "."/imm32
56/push-esi
68/push "' is at address "/imm32
52/push-edx
68/push "label '"/imm32
# . . call
e8/call trace-slsns/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 0x14/imm32 # add to esp
# continue
e9/jump $compute-offsets:word-loop/disp32
$compute-offsets:case-default:
# width/eax = compute-width-of-slice(word-slice)
# . . push args
52/push-edx
# . . call
e8/call compute-width-of-slice/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp
# current-address += width
01/add 3/mod/direct 6/rm32/esi . . . 0/r32/eax . . # add eax to *esi
#? # dump segment-offset {{{
#? # . write(2/stderr, "segment-offset: ")
#? # . . push args
#? 68/push "segment-offset: "/imm32
#? 68/push 2/imm32/stderr
#? # . . call
#? e8/call write/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
#? # . clear-stream($Stderr->buffer)
#? # . . push args
#? 68/push $Stderr->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-int32-hex-buffered(Stderr, segment-offset)
#? # . . push args
#? 52/push-edx
#? ff 6/subop/push 0/mod/indirect 5/rm32/.disp32 . . . compute-offsets:segment-offset/disp32 # push *segment-offset
#? 68/push Stderr/imm32
#? # . . call
#? e8/call write-int32-hex-buffered/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
#? # . flush(Stderr)
#? # . . push args
#? 68/push Stderr/imm32
#? # . . call
#? e8/call flush/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp
#? # . write(2/stderr, "\n")
#? # . . push args
#? 68/push Newline/imm32
#? 68/push 2/imm32/stderr
#? # . . call
#? e8/call write/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
#? # }}}
e9/jump $compute-offsets:word-loop/disp32
$compute-offsets:end:
# . reclaim locals
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 0x214/imm32 # add to esp
# . restore registers
5f/pop-to-edi
5e/pop-to-esi
5b/pop-to-ebx
5a/pop-to-edx
59/pop-to-ecx
58/pop-to-eax
# . epilogue
89/copy 3/mod/direct 4/rm32/esp . . . 5/r32/ebp . . # copy ebp to esp
5d/pop-to-ebp
c3/return
$compute-offsets:abort:
# . _write(2/stderr, error)
# . . push args
68/push "'==' must be followed by segment name and segment-start\n"/imm32
68/push 2/imm32/stderr
# . . call
e8/call _write/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# . syscall(exit, 1)
bb/copy-to-ebx 1/imm32
e8/call syscall_exit/disp32
# never gets here
test-compute-offsets:
# input:
# == code
# ab x/imm32 # skip comment
# == data
# 00
# x:
# 34
#
# trace contains (in any order):
# label 'x' is at address 0x8806.
#
# . prologue
55/push-ebp
89/copy 3/mod/direct 5/rm32/ebp . . . 4/r32/esp . . # copy esp to ebp
# setup
# . clear-stream(_test-input-stream)
# . . push args
68/push _test-input-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
# var labels/edx: (stream byte 2*12)
81 5/subop/subtract 3/mod/direct 4/rm32/esp . . . . . 0x18/imm32 # subtract from esp
68/push 0x18/imm32/size
68/push 0/imm32/read
68/push 0/imm32/write
89/copy 3/mod/direct 2/rm32/edx . . . 4/r32/esp . . # copy esp to edx
# initialize input
# . write(_test-input-stream, "== code\n")
# . . push args
68/push "== code\n"/imm32
68/push _test-input-stream/imm32
# . . call
e8/call write/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# . write(_test-input-stream, "ab x/imm32 # skip comment\n")
# . . push args
68/push "ab x/imm32 # skip comment\n"/imm32
68/push _test-input-stream/imm32
# . . call
e8/call write/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# . write(_test-input-stream, "== data\n")
# . . push args
68/push "== data\n"/imm32
68/push _test-input-stream/imm32
# . . call
e8/call write/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# . write(_test-input-stream, "00\n")
# . . push args
68/push "00\n"/imm32
68/push _test-input-stream/imm32
# . . call
e8/call write/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# . write(_test-input-stream, "x:\n")
# . . push args
68/push "x:\n"/imm32
68/push _test-input-stream/imm32
# . . call
e8/call write/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# . write(_test-input-stream, "34\n")
# . . push args
68/push "34\n"/imm32
68/push _test-input-stream/imm32
# . . call
e8/call write/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# compute-offsets(_test-input-stream, labels)
# . . push args
52/push-edx
68/push _test-input-stream/imm32
# . . call
e8/call compute-offsets/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
#? # dump *Trace-stream {{{
#? # . write(2/stderr, "^")
#? # . . push args
#? 68/push "^"/imm32
#? 68/push 2/imm32/stderr
#? # . . call
#? e8/call write/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
#? # . write-stream(2/stderr, *Trace-stream)
#? # . . push args
#? ff 6/subop/push 0/mod/indirect 5/rm32/.disp32 . . . Trace-stream/disp32 # push *Trace-stream
#? 68/push 2/imm32/stderr
#? # . . call
#? e8/call write-stream/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
#? # . write(2/stderr, "$\n")
#? # . . push args
#? 68/push "$\n"/imm32
#? 68/push 2/imm32/stderr
#? # . . call
#? e8/call write/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
#? # }}}
# . check-trace-contains("label 'x' is at address 0x00008806.", msg)
# . . push args
68/push "F - test-compute-offsets"/imm32
68/push "label 'x' is at address 0x00008806."/imm32
# . . call
e8/call check-trace-contains/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# . check-ints-equal(labels->write, 0xc, msg)
# . . push args
68/push "F - test-compute-offsets-maintains-labels-write-index"/imm32
68/push 0xc/imm32/1-entry
ff 6/subop/push 0/mod/indirect 2/rm32/edx . . . . . . # push *edx
# . . call
e8/call check-ints-equal/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 0xc/imm32 # add to esp
# . reclaim locals
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 0x24/imm32 # add to esp
# . epilogue
89/copy 3/mod/direct 4/rm32/esp . . . 5/r32/ebp . . # copy ebp to esp
5d/pop-to-ebp
c3/return
# global scratch space for emit-output
== data
emit-output:datum: # slice
0/imm32/start
0/imm32/end
== code
emit-output: # in: (addr stream byte), out: (addr buffered-file), labels: (addr stream {(handle array byte), address})
# pseudocode:
# var address-of-next-instruction = 0x8800
# var line: (stream byte 512)
# line-loop:
# while true
# clear-stream(line)
# read-line(in, line)
# if (line->write == 0) break # end of file
# address-of-next-instruction += num-bytes(line)
# var is-far-jump-or-call? = is-far-jump-or-call?(line)
# rewind-stream(line)
# while true
# var word-slice = next-word(line)
# if slice-empty?(word-slice) # end of line
# break
# if slice-starts-with?(word-slice, "#") # comment
# break
# if is-label?(word-slice) # no need for label declarations anymore
# goto line-loop # don't insert empty lines
# if slice-equal?(word-slice, "==") # no need for segment header lines
# goto line-loop # don't insert empty lines
# if length(word-slice) == 2
# write-slice-buffered(out, word-slice)
# write-buffered(out, " ")
# continue
# var datum: (addr slice) = next-token-from-slice(word-slice->start, word-slice->end, "/")
# var address: (addr int) = get-slice(labels, datum)
# if has-metadata?(word-slice, "imm8")
# abort
# else if has-metadata?(word-slice, "imm32")
# emit(out, *address, 4)
# else if has-metadata?(word-slice, "disp8")
# value = *address - address-of-next-instruction
# emit(out, value, 1)
# else if has-metadata?(word-slice, "disp32")
# if is-far-jump-or-call?
# value = *address - address-of-next-instruction
# else
# value = *address
# emit(out, value, 4)
# else
# abort
# write-buffered(out, "\n")
#
# registers:
# line: ecx
# word-slice: edx
# address-of-next-instruction: ebx
# is-far-jump-or-call?: edi
# address: esi (inner loop only)
# temporaries: eax, esi (outer loop)
#
# . prologue
55/push-ebp
89/copy 3/mod/direct 5/rm32/ebp . . . 4/r32/esp . . # copy esp to ebp
# . save registers
50/push-eax
51/push-ecx
52/push-edx
53/push-ebx
56/push-esi
57/push-edi
# var line/ecx: (stream byte 512)
81 5/subop/subtract 3/mod/direct 4/rm32/esp . . . . . 0x200/imm32 # subtract from esp
68/push 0x200/imm32/size
68/push 0/imm32/read
68/push 0/imm32/write
89/copy 3/mod/direct 1/rm32/ecx . . . 4/r32/esp . . # copy esp to ecx
# var word-slice/edx: slice
68/push 0/imm32/end
68/push 0/imm32/start
89/copy 3/mod/direct 2/rm32/edx . . . 4/r32/esp . . # copy esp to edx
# var address-of-next-instruction/ebx = 0x8800
bb/copy-to-ebx 0x8800/imm32
$emit-output:line-loop:
# clear-stream(line)
# . . push args
51/push-ecx
# . . call
e8/call clear-stream/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp
# read-line(in, line)
# . . push args
51/push-ecx
ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp . . . . 8/disp8 . # push *(ebp+8)
# . . call
e8/call read-line/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
#? # dump line {{{
#? # . write(2/stderr, "LL: ")
#? # . . push args
#? 68/push "LL: "/imm32
#? 68/push 2/imm32/stderr
#? # . . call
#? e8/call write/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
#? # write-stream(2/stderr, line)
#? # . . push args
#? 51/push-ecx
#? 68/push 2/imm32/stderr
#? # . . call
#? e8/call write-stream/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
#? # . write(2/stderr, "$\n")
#? # . . push args
#? 68/push "$\n"/imm32
#? 68/push 2/imm32/stderr
#? # . . call
#? e8/call write/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
#? # . rewind-stream(line)
#? # . . push args
#? 51/push-ecx
#? # . . call
#? e8/call rewind-stream/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp
#? # }}}
$emit-output:check-for-end-of-input:
# if (line->write == 0) break
81 7/subop/compare 0/mod/indirect 1/rm32/ecx . . . . . 0/imm32 # compare *ecx
0f 84/jump-if-= $emit-output:end/disp32
# address-of-next-instruction += num-bytes(line)
# . eax = num-bytes(line)
# . . push args
51/push-ecx
# . . call
e8/call num-bytes/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp
# . ebx += eax
01/add 3/mod/direct 3/rm32/ebx . . . 0/r32/eax . . # add eax to ebx
# var is-far-jump-or-call?/edi: boolean = is-far-jump-or-call?(line)
# . . push args
51/push-ecx
# . . call
e8/call is-far-jump-or-call?/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp
# rewind-stream(line)
# . . push args
51/push-ecx
# . . call
e8/call rewind-stream/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp
$emit-output:word-loop:
# next-word(line, word-slice)
# . . push args
52/push-edx
51/push-ecx
# . . call
e8/call next-word/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
#? # dump word-slice {{{
#? # . write(2/stderr, "w: ")
#? # . . push args
#? 68/push "w: "/imm32
#? 68/push 2/imm32/stderr
#? # . . call
#? e8/call write/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
#? # . write-slice-buffered(Stderr, word-slice)
#? # . . push args
#? 52/push-edx
#? 68/push Stderr/imm32
#? # . . call
#? e8/call write-slice-buffered/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
#? # . flush(Stderr)
#? # . . push args
#? 68/push Stderr/imm32
#? # . . call
#? e8/call flush/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp
#? # . write(2/stderr, "$\n")
#? # . . push args
#? 68/push "$\n"/imm32
#? 68/push 2/imm32/stderr
#? # . . call
#? e8/call write/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
#? # }}}
$emit-output:check-for-end-of-line:
# if (slice-empty?(word-slice)) break
# . eax = slice-empty?(word-slice)
# . . push args
52/push-edx
# . . call
e8/call slice-empty?/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp
# . if (eax != 0) break
3d/compare-eax-and 0/imm32/false
0f 85/jump-if-!= $emit-output:next-line/disp32
$emit-output:check-for-comment:
# if (slice-starts-with?(word-slice, "#")) break
# . start/esi = word-slice->start
8b/copy 0/mod/indirect 2/rm32/edx . . . 6/r32/esi . . # copy *edx to esi
# . c/eax = *start
31/xor 3/mod/direct 0/rm32/eax . . . 0/r32/eax . . # clear eax
8a/copy-byte 0/mod/indirect 6/rm32/esi . . . 0/r32/AL . . # copy byte at *esi to AL
# . if (eax == '#') break
3d/compare-eax-and 0x23/imm32/hash
0f 84/jump-if-= $emit-output:next-line/disp32
$emit-output:check-for-label:
# if is-label?(word-slice) break
# . eax = is-label?(word-slice)
# . . push args
52/push-edx
# . . call
e8/call is-label?/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp
# . if (eax != false) break
3d/compare-eax-and 0/imm32/false
0f 85/jump-if-!= $emit-output:line-loop/disp32
$emit-output:check-for-segment-header:
# if (slice-equal?(word-slice, "==")) break
# . eax = slice-equal?(word-slice, "==")
# . . push args
68/push "=="/imm32
52/push-edx
# . . call
e8/call slice-equal?/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# . if (eax != false) break
3d/compare-eax-and 0/imm32/false
0f 85/jump-if-!= $emit-output:line-loop/disp32
$emit-output:2-character:
# if (size(word-slice) != 2) goto next check
# . eax = size(word-slice)
8b/copy 1/mod/*+disp8 2/rm32/edx . . . 0/r32/eax 4/disp8 . # copy *(edx+4) to eax
2b/subtract 0/mod/indirect 2/rm32/edx . . . 0/r32/eax . . # subtract *edx from eax
# . if (eax != 2) goto next check
3d/compare-eax-and 2/imm32
75/jump-if-!= $emit-output:check-metadata/disp8
# write-slice-buffered(out, word-slice)
# . . push args
52/push-edx
ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp . . . . 0xc/disp8 . # push *(ebp+12)
# . . call
e8/call write-slice-buffered/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# write-buffered(out, " ")
# . . push args
68/push Space/imm32
ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp . . . . 0xc/disp8 . # push *(ebp+12)
# . . call
e8/call write-buffered/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# continue
e9/jump $emit-output:word-loop/disp32
$emit-output:check-metadata:
# - if we get here, 'word-slice' must be a label to be looked up
# datum = next-token-from-slice(word-slice->start, word-slice->end, "/")
# . . push args
68/push emit-output:datum/imm32
68/push 0x2f/imm32/slash
ff 6/subop/push 1/mod/*+disp8 2/rm32/edx . . . . 4/disp8 . # push *(edx+4)
ff 6/subop/push 0/mod/indirect 2/rm32/edx . . . . . . # push *edx
# . . call
e8/call next-token-from-slice/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 0x10/imm32 # add to esp
#? # dump datum {{{
#? # . write(2/stderr, "datum: ")
#? # . . push args
#? 68/push "datum: "/imm32
#? 68/push 2/imm32/stderr
#? # . . call
#? e8/call write/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
#? # . write-slice-buffered(Stderr, datum)
#? # . . push args
#? 68/push emit-output:datum/imm32
#? 68/push Stderr/imm32
#? # . . call
#? e8/call write-slice-buffered/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
#? # . flush(Stderr)
#? # . . push args
#? 68/push Stderr/imm32
#? # . . call
#? e8/call flush/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp
#? # . write(2/stderr, "$\n")
#? # . . push args
#? 68/push "$\n"/imm32
#? 68/push 2/imm32/stderr
#? # . . call
#? e8/call write/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
#? # }}}
# address/esi: (addr int) = get-slice(labels, datum, row-size=12, "label table")
# . eax = get-slice(labels, datum, row-size=24, "label table")
# . . push args
68/push "label table"/imm32
68/push 0xc/imm32/row-size
68/push emit-output:datum/imm32
ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp . . . . 0x10/disp8 . # push *(ebp+16)
# . . call
e8/call get-slice/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 0x10/imm32 # add to esp
# . esi = eax
89/copy 3/mod/direct 6/rm32/esi . . . 0/r32/eax . . # copy eax to esi
$emit-output:check-imm8:
# if (has-metadata?(word-slice, "imm8")) abort
# . eax = has-metadata?(edx, "imm8")
# . . push args
68/push "imm8"/imm32
52/push-edx
# . . call
e8/call has-metadata?/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# . if (eax != false) abort
3d/compare-eax-and 0/imm32/false
0f 85/jump-if-!= $emit-output:imm8-abort/disp32
$emit-output:check-imm32:
# if (!has-metadata?(word-slice, "imm32")) goto next check
# . eax = has-metadata?(edx, "imm32")
# . . push args
68/push "imm32"/imm32
52/push-edx
# . . call
e8/call has-metadata?/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# . if (eax == false) goto next check
3d/compare-eax-and 0/imm32/false
74/jump-if-= $emit-output:check-disp8/disp8
#? # dump *address {{{
#? # . write(2/stderr, "*address: ")
#? # . . push args
#? 68/push "*address: "/imm32
#? 68/push 2/imm32/stderr
#? # . . call
#? e8/call write/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
#? # . write-int32-hex-buffered(Stderr, *address)
#? # . . push args
#? ff 6/subop/push 0/mod/indirect 6/rm32/esi . . . . . . # push *esi
#? 68/push Stderr/imm32
#? # . . call
#? e8/call write-int32-hex-buffered/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
#? # . flush(Stderr)
#? # . . push args
#? 68/push Stderr/imm32
#? # . . call
#? e8/call flush/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp
#? # . write(2/stderr, "$\n")
#? # . . push args
#? 68/push "$\n"/imm32
#? 68/push 2/imm32/stderr
#? # . . call
#? e8/call write/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
#? # }}}
$emit-output:emit-imm32:
# emit-hex(out, *address, 4)
# . . push args
68/push 4/imm32
ff 6/subop/push 0/mod/indirect 6/rm32/esi . . . . . . # push *esi
ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp . . . . 0xc/disp8 . # push *(ebp+12)
# . . call
e8/call emit-hex/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 0xc/imm32 # add to esp
# continue
e9/jump $emit-output:word-loop/disp32
$emit-output:check-disp8:
# if (!has-metadata?(word-slice, "disp8")) goto next check
# . eax = has-metadata?(edx, "disp8")
# . . push args
68/push "disp8"/imm32
52/push-edx
# . . call
e8/call has-metadata?/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# . if (eax == false) goto next check
3d/compare-eax-and 0/imm32/false
74/jump-if-= $emit-output:check-disp32/disp8
$emit-output:emit-disp8:
# emit-hex(out, *address - address-of-next-instruction, 1)
# . . push args
68/push 1/imm32
8b/copy 0/mod/indirect 6/rm32/esi . . . 0/r32/eax . . # copy *esi to eax
29/subtract 3/mod/direct 0/rm32/eax . . . 3/r32/ebx . . # subtract ebx from eax
50/push-eax
ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp . . . . 0xc/disp8 . # push *(ebp+12)
# . . call
e8/call emit-hex/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 0xc/imm32 # add to esp
# continue
e9/jump $emit-output:word-loop/disp32
$emit-output:check-disp32:
# if (!has-metadata?(word-slice, "disp32")) abort
# . eax = has-metadata?(edx, "disp32")
# . . push args
68/push "disp32"/imm32
52/push-edx
# . . call
e8/call has-metadata?/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# . if (eax == false) abort
3d/compare-eax-and 0/imm32/false
0f 84/jump-if-= $emit-output:abort/disp32
$emit-output:emit-disp32:
# var value/eax = *address
8b/copy 0/mod/indirect 6/rm32/esi . . . 0/r32/eax . . # copy *esi to eax
# if (is-far-jump-or-call?) value -= address-of-next-instruction
81 7/subop/compare 3/mod/direct 7/rm32/edi . . . . . 0/imm32/false # compare edi
74/jump-if-= $emit-output:really-emit-disp32/disp8
29/subtract 3/mod/direct 0/rm32/eax . . . 3/r32/ebx . . # subtract ebx from eax
$emit-output:really-emit-disp32:
# emit-hex(out, value, 4)
# . . push args
68/push 4/imm32
50/push-eax
ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp . . . . 0xc/disp8 . # push *(ebp+12)
# . . call
e8/call emit-hex/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 0xc/imm32 # add to esp
# continue
e9/jump $emit-output:word-loop/disp32
$emit-output:next-line:
# write-buffered(out, "\n")
# . . push args
68/push Newline/imm32
ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp . . . . 0xc/disp8 . # push *(ebp+12)
# . . call
e8/call write-buffered/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# loop
e9/jump $emit-output:line-loop/disp32
$emit-output:end:
# . reclaim locals
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 0x214/imm32 # add to esp
# . restore registers
5f/pop-to-edi
5e/pop-to-esi
5b/pop-to-ebx
5a/pop-to-edx
59/pop-to-ecx
58/pop-to-eax
# . epilogue
89/copy 3/mod/direct 4/rm32/esp . . . 5/r32/ebp . . # copy ebp to esp
5d/pop-to-ebp
c3/return
$emit-output:global-variable-abort:
# . _write(2/stderr, error)
# . . push args
68/push "emit-output: must refer to global variables with /disp32 or /imm32"/imm32
68/push 2/imm32/stderr
# . . call
e8/call _write/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# . syscall(exit, 1)
bb/copy-to-ebx 1/imm32
e8/call syscall_exit/disp32
# never gets here
$emit-output:imm8-abort:
# . _write(2/stderr, error)
# . . push args
68/push "emit-output: cannot refer to code labels with /imm8"/imm32
68/push 2/imm32/stderr
# . . call
e8/call _write/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# . syscall(exit, 1)
bb/copy-to-ebx 1/imm32
e8/call syscall_exit/disp32
# never gets here
$emit-output:abort:
# print(stderr, "missing metadata in " word-slice)
# . _write(2/stderr, "missing metadata in word ")
# . . push args
68/push "emit-output: missing metadata in "/imm32
68/push 2/imm32/stderr
# . . call
e8/call _write/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# . write-slice-buffered(Stderr, word-slice)
# . . push args
52/push-edx
68/push Stderr/imm32
# . . call
e8/call write-slice-buffered/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# . flush(Stderr)
# . . push args
68/push Stderr/imm32
# . . call
e8/call flush/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp
# . syscall(exit, 1)
bb/copy-to-ebx 1/imm32
e8/call syscall_exit/disp32
# never gets here
test-emit-output-non-far-control-flow:
# labels turn into absolute addresses if opcodes are not far jumps or calls
#
# input:
# in:
# == code
# ab cd ef gh
# ij x/disp32
# == data
# 00
# 34
# labels:
# - 'x': 0x11223344
#
# output:
# ab cd ef gh
# ij 44 33 22 11
# 00
# 34
#
# . prologue
55/push-ebp
89/copy 3/mod/direct 5/rm32/ebp . . . 4/r32/esp . . # copy esp to ebp
# setup
# . clear-stream(_test-input-stream)
# . . push args
68/push _test-input-stream/imm32
# . . call
e8/call clear-stream/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp
# . clear-stream(_test-output-stream)
# . . push args
68/push _test-output-stream/imm32
# . . call
e8/call clear-stream/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp
# . clear-stream($_test-output-buffered-file->buffer)
# . . push args
68/push $_test-output-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
# . var labels/edx: (stream byte 8*24)
81 5/subop/subtract 3/mod/direct 4/rm32/esp . . . . . 0xc0/imm32 # subtract from esp
68/push 0xc0/imm32/size
68/push 0/imm32/read
68/push 0/imm32/write
89/copy 3/mod/direct 2/rm32/edx . . . 4/r32/esp . . # copy esp to edx
# . var h/ebx: (handle array byte)
68/push 0/imm32
68/push 0/imm32
89/copy 3/mod/direct 3/rm32/ebx . . . 4/r32/esp . . # copy esp to ebx
# initialize input
# . write(_test-input-stream, "== code\n")
# . . push args
68/push "== code\n"/imm32
68/push _test-input-stream/imm32
# . . call
e8/call write/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# . write(_test-input-stream, "ab cd ef gh\n")
# . . push args
68/push "ab cd ef gh\n"/imm32
68/push _test-input-stream/imm32
# . . call
e8/call write/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# . write(_test-input-stream, "ij x/disp32\n")
# . . push args
68/push "ij x/disp32\n"/imm32
68/push _test-input-stream/imm32
# . . call
e8/call write/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# . write(_test-input-stream, "== data\n")
# . . push args
68/push "== data\n"/imm32
68/push _test-input-stream/imm32
# . . call
e8/call write/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# . write(_test-input-stream, "00\n")
# . . push args
68/push "00\n"/imm32
68/push _test-input-stream/imm32
# . . call
e8/call write/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# . write(_test-input-stream, "34\n")
# . . push args
68/push "34\n"/imm32
68/push _test-input-stream/imm32
# . . call
e8/call write/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# . stream-add2(labels, "x", 0x11223344)
68/push 0x11223344/imm32/label-address
# . . push handle for "x"
53/push-ebx
68/push "x"/imm32
68/push Heap/imm32
e8/call copy-array/disp32
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 0xc/imm32 # add to esp
ff 6/subop/push 1/mod/*+disp8 3/rm32/ebx . . . . 4/disp8 . # push *(ebx+4)
ff 6/subop/push 0/mod/indirect 3/rm32/ebx . . . . . . # push *ebx
# . . push labels
52/push-edx
# . . call
e8/call stream-add2/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 0x10/imm32 # add to esp
# component under test
# . emit-output(_test-input-stream, _test-output-buffered-file, labels)
# . . push args
52/push-edx
68/push _test-output-buffered-file/imm32
68/push _test-input-stream/imm32
# . . call
e8/call emit-output/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 0xc/imm32 # add to esp
# checks
# . flush(_test-output-buffered-file)
# . . push args
68/push _test-output-buffered-file/imm32
# . . call
e8/call flush/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp
#? # dump output {{{
#? # . write(2/stderr, "result: ^")
#? # . . push args
#? 68/push "result: ^"/imm32
#? 68/push 2/imm32/stderr
#? # . . call
#? e8/call write/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
#? # . write-stream(2/stderr, _test-output-stream)
#? # . . push args
#? 68/push _test-output-stream/imm32
#? 68/push 2/imm32/stderr
#? # . . call
#? e8/call write-stream/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
#? # . write(2/stderr, "$\n")
#? # . . push args
#? 68/push "$\n"/imm32
#? 68/push 2/imm32/stderr
#? # . . call
#? e8/call write/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
#? # . rewind-stream(_test-output-stream)
#? # . . push args
#? 68/push _test-output-stream/imm32
#? # . . call
#? e8/call rewind-stream/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp
#? # }}}
# . check-next-stream-line-equal(_test-output-stream, "ab cd ef gh ", msg)
# . . push args
68/push "F - test-emit-output-non-far-control-flow/0"/imm32
68/push "ab cd ef gh "/imm32
68/push _test-output-stream/imm32
# . . call
e8/call check-next-stream-line-equal/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 0xc/imm32 # add to esp
# . check-next-stream-line-equal(_test-output-stream, "ij 44 33 22 11 ", msg)
# . . push args
68/push "F - test-emit-output-non-far-control-flow/1"/imm32
68/push "ij 44 33 22 11 "/imm32
68/push _test-output-stream/imm32
# . . call
e8/call check-next-stream-line-equal/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 0xc/imm32 # add to esp
# . check-next-stream-line-equal(_test-output-stream, "00 ", msg)
# . . push args
68/push "F - test-emit-output-non-far-control-flow/2"/imm32
68/push "00 "/imm32
68/push _test-output-stream/imm32
# . . call
e8/call check-next-stream-line-equal/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 0xc/imm32 # add to esp
# . check-next-stream-line-equal(_test-output-stream, "34 ", msg)
# . . push args
68/push "F - test-emit-output-non-far-control-flow/3"/imm32
68/push "34 "/imm32
68/push _test-output-stream/imm32
# . . call
e8/call check-next-stream-line-equal/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 0xc/imm32 # add to esp
# . epilogue
89/copy 3/mod/direct 4/rm32/esp . . . 5/r32/ebp . . # copy ebp to esp
5d/pop-to-ebp
c3/return
test-emit-output-code-label:
# labels turn into PC-relative addresses if opcodes are far jumps or calls
#
# input:
# in:
# == code
# ab cd
# ef gh
# e8 l1/disp32
# labels:
# - 'l1': 0x8810
#
# output:
# ab cd
# ef gh
# e8 07 00 00 00 # 0x8810 - 0x8809 = 7
#
# . prologue
55/push-ebp
89/copy 3/mod/direct 5/rm32/ebp . . . 4/r32/esp . . # copy esp to ebp
# setup
# . clear-stream(_test-input-stream)
# . . push args
68/push _test-input-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-output-stream)
# . . push args
68/push _test-output-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-output-buffered-file->buffer)
# . . push args
68/push $_test-output-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
# . var labels/edx: (stream byte 8*24)
81 5/subop/subtract 3/mod/direct 4/rm32/esp . . . . . 0xc0/imm32 # subtract from esp
68/push 0xc0/imm32/size
68/push 0/imm32/read
68/push 0/imm32/write
89/copy 3/mod/direct 2/rm32/edx . . . 4/r32/esp . . # copy esp to edx
# . var h/ebx: (handle array byte)
68/push 0/imm32
68/push 0/imm32
89/copy 3/mod/direct 3/rm32/ebx . . . 4/r32/esp . . # copy esp to ebx
# initialize input
# . write(_test-input-stream, "== code\n")
# . . push args
68/push "== code\n"/imm32
68/push _test-input-stream/imm32
# . . call
e8/call write/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# . write(_test-input-stream, "ab cd\n")
# . . push args
68/push "ab cd\n"/imm32
68/push _test-input-stream/imm32
# . . call
e8/call write/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# . write(_test-input-stream, "ef gh\n")
# . . push args
68/push "ef gh\n"/imm32
68/push _test-input-stream/imm32
# . . call
e8/call write/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# . write(_test-input-stream, "e8 l1/disp32\n")
# . . push args
68/push "e8 l1/disp32\n"/imm32
68/push _test-input-stream/imm32
# . . call
e8/call write/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# . stream-add2(labels, "l1", 0x8810)
68/push 0x8810/imm32/label-address
# . . push handle for "l1"
53/push-ebx
68/push "l1"/imm32
68/push Heap/imm32
e8/call copy-array/disp32
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 0xc/imm32 # add to esp
ff 6/subop/push 1/mod/*+disp8 3/rm32/ebx . . . . 4/disp8 . # push *(ebx+4)
ff 6/subop/push 0/mod/indirect 3/rm32/ebx . . . . . . # push *ebx
# . . push labels
52/push-edx
# . . call
e8/call stream-add2/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 0x10/imm32 # add to esp
# component under test
# . emit-output(_test-input-stream, _test-output-buffered-file, labels)
# . . push args
52/push-edx
68/push _test-output-buffered-file/imm32
68/push _test-input-stream/imm32
# . . call
e8/call emit-output/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 0xc/imm32 # add to esp
# checks
# . flush(_test-output-buffered-file)
# . . push args
68/push _test-output-buffered-file/imm32
# . . call
e8/call flush/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp
#? # dump output {{{
#? # . write(2/stderr, "result: ^")
#? # . . push args
#? 68/push "result: ^"/imm32
#? 68/push 2/imm32/stderr
#? # . . call
#? e8/call write/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
#? # . write-stream(2/stderr, _test-output-stream)
#? # . . push args
#? 68/push _test-output-stream/imm32
#? 68/push 2/imm32/stderr
#? # . . call
#? e8/call write-stream/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
#? # . write(2/stderr, "$\n")
#? # . . push args
#? 68/push "$\n"/imm32
#? 68/push 2/imm32/stderr
#? # . . call
#? e8/call write/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
#? # . rewind-stream(_test-output-stream)
#? # . . push args
#? 68/push _test-output-stream/imm32
#? # . . call
#? e8/call rewind-stream/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp
#? # }}}
# . check-next-stream-line-equal(_test-output-stream, "ab cd ", msg)
# . . push args
68/push "F - test-emit-output-code-label/0"/imm32
68/push "ab cd "/imm32
68/push _test-output-stream/imm32
# . . call
e8/call check-next-stream-line-equal/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 0xc/imm32 # add to esp
# . check-next-stream-line-equal(_test-output-stream, "ef gh ", msg)
# . . push args
68/push "F - test-emit-output-code-label/1"/imm32
68/push "ef gh "/imm32
68/push _test-output-stream/imm32
# . . call
e8/call check-next-stream-line-equal/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 0xc/imm32 # add to esp
# . check-next-stream-line-equal(_test-output-stream, "e8 07 00 00 00 ", msg)
# . . push args
68/push "F - test-emit-output-code-label/2"/imm32
68/push "e8 07 00 00 00 "/imm32
68/push _test-output-stream/imm32
# . . call
e8/call check-next-stream-line-equal/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 0xc/imm32 # add to esp
# . epilogue
89/copy 3/mod/direct 4/rm32/esp . . . 5/r32/ebp . . # copy ebp to esp
5d/pop-to-ebp
c3/return
test-emit-output-code-label-absolute:
# labels can also convert to absolute addresses
#
# input:
# in:
# == code
# ab cd
# ef gh
# ij l1/imm32
# labels:
# - 'l1': 0x1056
#
# output:
# ab cd
# ef gh
# ij 56 10 00 00
#
# . prologue
55/push-ebp
89/copy 3/mod/direct 5/rm32/ebp . . . 4/r32/esp . . # copy esp to ebp
# setup
# . clear-stream(_test-input-stream)
# . . push args
68/push _test-input-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-output-stream)
# . . push args
68/push _test-output-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-output-buffered-file->buffer)
# . . push args
68/push $_test-output-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
# . var labels/edx: (stream byte 8*24)
81 5/subop/subtract 3/mod/direct 4/rm32/esp . . . . . 0xc0/imm32 # subtract from esp
68/push 0xc0/imm32/size
68/push 0/imm32/read
68/push 0/imm32/write
89/copy 3/mod/direct 2/rm32/edx . . . 4/r32/esp . . # copy esp to edx
# . var h/ebx: (handle array byte)
68/push 0/imm32
68/push 0/imm32
89/copy 3/mod/direct 3/rm32/ebx . . . 4/r32/esp . . # copy esp to ebx
# initialize input
# . write(_test-input-stream, "== code 0x1000\n")
# . . push args
68/push "== code\n"/imm32
68/push _test-input-stream/imm32
# . . call
e8/call write/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# . write(_test-input-stream, "ab cd\n")
# . . push args
68/push "ab cd\n"/imm32
68/push _test-input-stream/imm32
# . . call
e8/call write/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# . write(_test-input-stream, "ef gh\n")
# . . push args
68/push "ef gh\n"/imm32
68/push _test-input-stream/imm32
# . . call
e8/call write/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# . write(_test-input-stream, "ij l1/imm32\n")
# . . push args
68/push "ij l1/imm32\n"/imm32
68/push _test-input-stream/imm32
# . . call
e8/call write/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# . stream-add2(labels, "l1", 0x1056)
68/push 0x1056/imm32/label-address
# . . push handle for "l1"
53/push-ebx
68/push "l1"/imm32
68/push Heap/imm32
e8/call copy-array/disp32
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 0xc/imm32 # add to esp
ff 6/subop/push 1/mod/*+disp8 3/rm32/ebx . . . . 4/disp8 . # push *(ebx+4)
ff 6/subop/push 0/mod/indirect 3/rm32/ebx . . . . . . # push *ebx
# . . push labels
52/push-edx
# . . call
e8/call stream-add2/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 0x10/imm32 # add to esp
# component under test
# . emit-output(_test-input-stream, _test-output-buffered-file, labels)
# . . push args
52/push-edx
68/push _test-output-buffered-file/imm32
68/push _test-input-stream/imm32
# . . call
e8/call emit-output/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 0xc/imm32 # add to esp
# checks
# . flush(_test-output-buffered-file)
# . . push args
68/push _test-output-buffered-file/imm32
# . . call
e8/call flush/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp
#? # dump output {{{
#? # . write(2/stderr, "result: ^")
#? # . . push args
#? 68/push "result: ^"/imm32
#? 68/push 2/imm32/stderr
#? # . . call
#? e8/call write/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
#? # . write-stream(2/stderr, _test-output-stream)
#? # . . push args
#? 68/push _test-output-stream/imm32
#? 68/push 2/imm32/stderr
#? # . . call
#? e8/call write-stream/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
#? # . write(2/stderr, "$\n")
#? # . . push args
#? 68/push "$\n"/imm32
#? 68/push 2/imm32/stderr
#? # . . call
#? e8/call write/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
#? # . rewind-stream(_test-output-stream)
#? # . . push args
#? 68/push _test-output-stream/imm32
#? # . . call
#? e8/call rewind-stream/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp
#? # }}}
# . check-next-stream-line-equal(_test-output-stream, "ab cd ", msg)
# . . push args
68/push "F - test-emit-output-code-label-absolute/0"/imm32
68/push "ab cd "/imm32
68/push _test-output-stream/imm32
# . . call
e8/call check-next-stream-line-equal/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 0xc/imm32 # add to esp
# . check-next-stream-line-equal(_test-output-stream, "ef gh ", msg)
# . . push args
68/push "F - test-emit-output-code-label-absolute/1"/imm32
68/push "ef gh "/imm32
68/push _test-output-stream/imm32
# . . call
e8/call check-next-stream-line-equal/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 0xc/imm32 # add to esp
# . check-next-stream-line-equal(_test-output-stream, "ij f9 ff ff ff ", msg)
# . . push args
68/push "F - test-emit-output-code-label-absolute/2"/imm32
68/push "ij 56 10 00 00 "/imm32
68/push _test-output-stream/imm32
# . . call
e8/call check-next-stream-line-equal/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 0xc/imm32 # add to esp
# . epilogue
89/copy 3/mod/direct 4/rm32/esp . . . 5/r32/ebp . . # copy ebp to esp
5d/pop-to-ebp
c3/return
# reads line to make some checks
# don't assume the read state of line after calling this function
is-far-jump-or-call?: # line: (addr stream byte) -> result/edi: boolean
# . prologue
55/push-ebp
89/copy 3/mod/direct 5/rm32/ebp . . . 4/r32/esp . . # copy esp to ebp
# . save registers
50/push-eax
51/push-ecx
52/push-edx
53/push-ebx
# ecx = line
8b/copy 1/mod/*+disp8 5/rm32/ebp . . . 1/r32/ecx 8/disp8 . # copy *(ebp+8) to ecx
# var word-slice/edx: slice
68/push 0/imm32/end
68/push 0/imm32/start
89/copy 3/mod/direct 2/rm32/edx . . . 4/r32/esp . . # copy esp to edx
# var datum-slice/ebx: slice
68/push 0/imm32/end
68/push 0/imm32/start
89/copy 3/mod/direct 3/rm32/ebx . . . 4/r32/esp . . # copy esp to ebx
# result = false
bf/copy-to-edi 0/imm32/false
$is-far-jump-or-call?:check-first-word:
# next-word(line, word-slice)
# . . push args
52/push-edx
51/push-ecx
# . . call
e8/call next-word/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# if (slice-empty?(word-slice)) return false
# . eax = slice-empty?(word-slice)
# . . push args
52/push-edx
# . . call
e8/call slice-empty?/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp
# . if (eax != 0) return
3d/compare-eax-and 0/imm32/false
0f 85/jump-if-!= $is-far-jump-or-call?:end/disp32
# datum = next-token-from-slice(word-slice->start, word-slice->end, "/")
# . . push args
53/push-ebx
68/push 0x2f/imm32/slash
ff 6/subop/push 1/mod/*+disp8 2/rm32/edx . . . . 4/disp8 . # push *(edx+4)
ff 6/subop/push 0/mod/indirect 2/rm32/edx . . . . . . # push *edx
# . . call
e8/call next-token-from-slice/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 0x10/imm32 # add to esp
# if (datum-slice == "e8") return true
# . eax = slice-equal?(datum-slice, "e8")
# . . push args
68/push "e8"/imm32
53/push-ebx
# . . call
e8/call slice-equal?/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# . if (eax != false) return true
3d/compare-eax-and 0/imm32/false
75/jump-if-!= $is-far-jump-or-call?:return-true/disp8
# if (datum-slice == "e9") return true
# . eax = slice-equal?(datum-slice, "e9")
# . . push args
68/push "e9"/imm32
53/push-ebx
# . . call
e8/call slice-equal?/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# . if (eax != false) return true
3d/compare-eax-and 0/imm32/false
75/jump-if-!= $is-far-jump-or-call?:return-true/disp8
# if (datum-slice != "0f") return false
# . eax = slice-equal?(datum-slice, "0f")
# . . push args
68/push "0f"/imm32
53/push-ebx
# . . call
e8/call slice-equal?/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# . if (eax == false) return
3d/compare-eax-and 0/imm32/false
74/jump-if-= $is-far-jump-or-call?:end/disp8
$is-far-jump-or-call?:check-second-word:
# next-word(line, word-slice)
# . . push args
52/push-edx
51/push-ecx
# . . call
e8/call next-word/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# if (slice-empty?(word-slice)) return false
# . eax = slice-empty?(word-slice)
# . . push args
52/push-edx
# . . call
e8/call slice-empty?/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp
# . if (eax != 0) return
3d/compare-eax-and 0/imm32/false
75/jump-if-!= $is-far-jump-or-call?:end/disp8
# if datum of word-slice does not start with "8", return false
# . start/eax = word-slice->start
8b/copy 0/mod/indirect 2/rm32/edx . . . 0/r32/eax . . # copy *edx to eax
# . c/eax = *start
8a/copy-byte 0/mod/indirect 0/rm32/eax . . . 0/r32/AL . . # copy byte at *eax to AL
81 4/subop/and 3/mod/direct 0/rm32/eax . . . . . 0xff/imm32 # bitwise and of eax
# . if (eax != '8') return
3d/compare-eax-and 0x38/imm32/8
75/jump-if-!= $is-far-jump-or-call?:end/disp8
# otherwise return true
$is-far-jump-or-call?:return-true:
bf/copy-to-edi 1/imm32/true
$is-far-jump-or-call?:end:
# . reclaim locals
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 0x10/imm32 # add to esp
# . restore registers
5b/pop-to-ebx
5a/pop-to-edx
59/pop-to-ecx
58/pop-to-eax
# . epilogue
89/copy 3/mod/direct 4/rm32/esp . . . 5/r32/ebp . . # copy ebp to esp
5d/pop-to-ebp
c3/return
# - some helpers for tests
stream-add2: # in: (addr stream byte), key: handle, val: int
# . prologue
55/push-ebp
89/copy 3/mod/direct 5/rm32/ebp . . . 4/r32/esp . . # copy esp to ebp
# . save registers
50/push-eax
51/push-ecx
52/push-edx
56/push-esi
# esi = in
8b/copy 1/mod/*+disp8 5/rm32/ebp . . . 6/r32/esi 8/disp8 . # copy *(ebp+8) to esi
# curr/eax = &in->data[in->write]
# . eax = in->write
8b/copy 0/mod/indirect 6/rm32/esi . . . 0/r32/eax . . # copy *esi to eax
# . eax = esi+eax+12
8d/copy-address 1/mod/*+disp8 4/rm32/sib 6/base/esi 0/index/eax . 0/r32/eax 0xc/disp8 . # copy esi+eax+12 to eax
# max/edx = &in->data[in->size]
# . edx = in->size
8b/copy 1/mod/*+disp8 6/rm32/esi . . . 2/r32/edx 8/disp8 . # copy *(esi+8) to edx
# . edx = esi+edx+12
8d/copy-address 1/mod/*+disp8 4/rm32/sib 6/base/esi 2/index/edx . 2/r32/edx 0xc/disp8 . # copy esi+edx+12 to edx
# if (curr >= max) abort
39/compare 3/mod/direct 0/rm32/eax . . . 2/r32/edx . . # compare eax with edx
73/jump-if-addr>= $stream-add2:abort/disp8
# *curr = key->alloc-id
8b/copy 1/mod/*+disp8 5/rm32/ebp . . 1/r32/ecx 0xc/disp8 . # copy *(ebp+12) to ecx
89/copy 0/mod/indirect 0/rm32/eax . . . 1/r32/ecx . . # copy ecx to *eax
# curr += 4
05/add-to-eax 4/imm32
# if (curr >= max) abort
39/compare 3/mod/direct 0/rm32/eax . . . 2/r32/edx . . # compare eax with edx
73/jump-if-addr>= $stream-add2:abort/disp8
# *curr = key->payload
8b/copy 1/mod/*+disp8 5/rm32/ebp . . 1/r32/ecx 0x10/disp8 . # copy *(ebp+16) to ecx
89/copy 0/mod/indirect 0/rm32/eax . . . 1/r32/ecx . . # copy ecx to *eax
# curr += 4
05/add-to-eax 4/imm32
# if (curr >= max) abort
39/compare 3/mod/direct 0/rm32/eax . . . 2/r32/edx . . # compare eax with edx
73/jump-if-addr>= $stream-add2:abort/disp8
# *curr = val
8b/copy 1/mod/*+disp8 5/rm32/ebp . . 1/r32/ecx 0x14/disp8 . # copy *(ebp+20) to ecx
89/copy 0/mod/indirect 0/rm32/eax . . . 1/r32/ecx . . # copy ecx to *eax
# in->write += 0xc
81 0/subop/add 0/mod/indirect 6/rm32/esi . . . . . 0xc/imm32 # add to *esi
$stream-add2:end:
# . restore registers
5e/pop-to-esi
5a/pop-to-edx
59/pop-to-ecx
58/pop-to-eax
# . epilogue
89/copy 3/mod/direct 4/rm32/esp . . . 5/r32/ebp . . # copy ebp to esp
5d/pop-to-ebp
c3/return
$stream-add2:abort:
# . _write(2/stderr, error)
# . . push args
68/push "overflow in stream-add2\n"/imm32
68/push 2/imm32/stderr
# . . call
e8/call _write/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# . syscall(exit, 1)
bb/copy-to-ebx 1/imm32
e8/call syscall_exit/disp32
# never gets here
# some variants of 'trace' that take multiple arguments in different combinations of types:
# n: int
# c: character [4-bytes, will eventually be UTF-8]
# s: (addr array byte)
# l: (addr slice)
# one gotcha: 's5' must not be empty
trace-slsns: # s1: (addr array byte), l2: (addr slice), s3: (addr array byte), n4: int, s5: (addr array byte)
# . prologue
55/push-ebp
89/copy 3/mod/direct 5/rm32/ebp . . . 4/r32/esp . . # copy esp to ebp
# write(*Trace-stream, s1)
# . . push args
ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp . . . . 8/disp8 . # push *(ebp+8)
ff 6/subop/push 0/mod/indirect 5/rm32/.disp32 . . . Trace-stream/disp32 # push *Trace-stream
# . . call
e8/call write/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# write-slice(*Trace-stream, l2)
# . . push args
ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp . . . . 0xc/disp8 . # push *(ebp+12)
ff 6/subop/push 0/mod/indirect 5/rm32/.disp32 . . . Trace-stream/disp32 # push *Trace-stream
# . . call
e8/call write-slice/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# write(*Trace-stream, s3)
# . . push args
ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp . . . . 0x10/disp8 . # push *(ebp+16)
ff 6/subop/push 0/mod/indirect 5/rm32/.disp32 . . . Trace-stream/disp32 # push *Trace-stream
# . . call
e8/call write/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# write-int32-hex(*Trace-stream, n4)
# . . push args
ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp . . . . 0x14/disp8 . # push *(ebp+20)
ff 6/subop/push 0/mod/indirect 5/rm32/.disp32 . . . Trace-stream/disp32 # push *Trace-stream
# . . call
e8/call write-int32-hex/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# trace(s5) # implicitly adds a newline and finalizes the trace line
# . . push args
ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp . . . . 0x18/disp8 . # push *(ebp+24)
# . . call
e8/call trace/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp
$trace-slsns:end:
# . epilogue
89/copy 3/mod/direct 4/rm32/esp . . . 5/r32/ebp . . # copy ebp to esp
5d/pop-to-ebp
c3/return
test-trace-slsns:
# . prologue
55/push-ebp
89/copy 3/mod/direct 5/rm32/ebp . . . 4/r32/esp . . # copy esp to ebp
# setup
# . *Trace-stream->write = 0
8b/copy 0/mod/indirect 5/rm32/.disp32 . . 0/r32/eax Trace-stream/disp32 # copy *Trace-stream to eax
c7 0/subop/copy 0/mod/direct 0/rm32/eax . . . . . 0/imm32 # clear *eax
# (eax..ecx) = "b"
b8/copy-to-eax "b"/imm32
8b/copy 0/mod/indirect 0/rm32/eax . . . 1/r32/ecx . . # copy *eax to ecx
8d/copy-address 1/mod/*+disp8 4/rm32/sib 0/base/eax 1/index/ecx . 1/r32/ecx 4/disp8 . # copy eax+ecx+4 to ecx
05/add-to-eax 4/imm32
# var b/ebx: slice = {eax, ecx}
51/push-ecx
50/push-eax
89/copy 3/mod/direct 3/rm32/ebx . . . 4/r32/esp . . # copy esp to ebx
# trace-slsls("A" b "c " 3 " e")
# . . push args
68/push " e"/imm32
68/push 3/imm32
68/push "c "/imm32
53/push-ebx
68/push "A"/imm32
# . . call
e8/call trace-slsns/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 0x14/imm32 # add to esp
#? # dump *Trace-stream {{{
#? # . write(2/stderr, "^")
#? # . . push args
#? 68/push "^"/imm32
#? 68/push 2/imm32/stderr
#? # . . call
#? e8/call write/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
#? # . write-stream(2/stderr, *Trace-stream)
#? # . . push args
#? ff 6/subop/push 0/mod/indirect 5/rm32/.disp32 . . . Trace-stream/disp32 # push *Trace-stream
#? 68/push 2/imm32/stderr
#? # . . call
#? e8/call write-stream/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
#? # . write(2/stderr, "$\n")
#? # . . push args
#? 68/push "$\n"/imm32
#? 68/push 2/imm32/stderr
#? # . . call
#? e8/call write/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
#? # }}}
# check-trace-contains("Abc 0x00000003 e")
# . . push args
68/push "F - test-trace-slsls"/imm32
68/push "Abc 0x00000003 e"/imm32
# . . call
e8/call check-trace-contains/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# . epilogue
89/copy 3/mod/direct 4/rm32/esp . . . 5/r32/ebp . . # copy ebp to esp
5d/pop-to-ebp
c3/return
num-bytes: # line: (addr stream byte) -> eax: int
# pseudocode:
# result = 0
# while true
# var word-slice = next-word(line)
# if slice-empty?(word-slice) # end of line
# break
# if slice-starts-with?(word-slice, "#") # comment
# break
# if is-label?(word-slice) # no need for label declarations anymore
# break
# if slice-equal?(word-slice, "==")
# break # no need for segment header lines
# result += compute-width(word-slice)
# return result
#
# . prologue
55/push-ebp
89/copy 3/mod/direct 5/rm32/ebp . . . 4/r32/esp . . # copy esp to ebp
# . save registers
51/push-ecx
52/push-edx
53/push-ebx
# var result/eax = 0
31/xor 3/mod/direct 0/rm32/eax . . . 0/r32/eax . . # clear eax
# var word-slice/ecx: slice
68/push 0/imm32/end
68/push 0/imm32/start
89/copy 3/mod/direct 1/rm32/ecx . . . 4/r32/esp . . # copy esp to ecx
#? # dump line {{{
#? # . write(2/stderr, "LL: ")
#? # . . push args
#? 68/push "LL: "/imm32
#? 68/push 2/imm32/stderr
#? # . . call
#? e8/call write/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
#? # write-stream(2/stderr, line)
#? # . . push args
#? ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp . . . . 8/disp8 . # push *(ebp+8)
#? 68/push 2/imm32/stderr
#? # . . call
#? e8/call write-stream/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
#? # . write(2/stderr, "$\n")
#? # . . push args
#? 68/push "$\n"/imm32
#? 68/push 2/imm32/stderr
#? # . . call
#? e8/call write/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
#? # }}}
# . rewind-stream(line)
# . . push args
ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp . . . . 8/disp8 . # push *(ebp+8)
# . . call
e8/call rewind-stream/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp
$num-bytes:loop:
# next-word(line, word-slice)
# . . push args
51/push-ecx
ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp . . . . 8/disp8 . # push *(ebp+8)
# . . call
e8/call next-word/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
#? # dump word-slice {{{
#? # . write(2/stderr, "AA: ")
#? # . . push args
#? 68/push "AA: "/imm32
#? 68/push 2/imm32/stderr
#? # . . call
#? e8/call write/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
#? # . clear-stream($Stderr->buffer)
#? # . . push args
#? 68/push $Stderr->buffer/imm32
#? # . . call
#? e8/call clear-stream/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp
#? # . write-slice-buffered(Stderr, word-slice)
#? # . . push args
#? 51/push-ecx
#? 68/push Stderr/imm32
#? # . . call
#? e8/call write-slice-buffered/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
#? # . flush(Stderr)
#? # . . push args
#? 68/push Stderr/imm32
#? # . . call
#? e8/call flush/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp
#? # . write(2/stderr, "$\n")
#? # . . push args
#? 68/push "$\n"/imm32
#? 68/push 2/imm32/stderr
#? # . . call
#? e8/call write/disp32
#? # . . discard args
#? 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
#? # }}}
$num-bytes:check0:
# if (slice-empty?(word-slice)) break
# . save result
50/push-eax
# . eax = slice-empty?(word-slice)
# . . push args
51/push-ecx
# . . call
e8/call slice-empty?/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp
# . if (eax != false) break
3d/compare-eax-and 0/imm32/false
# . restore result now that ZF is set
58/pop-to-eax
75/jump-if-!= $num-bytes:end/disp8
$num-bytes:check-for-comment:
# if (slice-starts-with?(word-slice, "#")) break
# . start/edx = word-slice->start
8b/copy 0/mod/indirect 1/rm32/ecx . . . 2/r32/edx . . # copy *ecx to edx
# . c/ebx = *start
31/xor 3/mod/direct 3/rm32/ebx . . . 3/r32/ebx . . # clear ebx
8a/copy-byte 0/mod/indirect 2/rm32/edx . . . 3/r32/BL . . # copy byte at *edx to BL
# . if (ebx == '#') break
81 7/subop/compare 3/mod/direct 3/rm32/ebx . . . . . 0x23/imm32/hash # compare ebx
74/jump-if-= $num-bytes:end/disp8
$num-bytes:check-for-label:
# if (slice-ends-with?(word-slice, ":")) break
# . end/edx = word-slice->end
8b/copy 1/mod/*+disp8 1/rm32/ecx . . . 2/r32/edx 4/disp8 . # copy *(ecx+4) to edx
# . c/ebx = *(end-1)
31/xor 3/mod/direct 3/rm32/ebx . . . 3/r32/ebx . . # clear ebx
8a/copy-byte 1/mod/*+disp8 2/rm32/edx . . . 3/r32/BL -1/disp8 . # copy byte at *ecx to BL
# . if (ebx == ':') break
81 7/subop/compare 3/mod/direct 3/rm32/ebx . . . . . 0x3a/imm32/colon # compare ebx
74/jump-if-= $num-bytes:end/disp8
$num-bytes:check-for-segment-header:
# if (slice-equal?(word-slice, "==")) break
# . push result
50/push-eax
# . eax = slice-equal?(word-slice, "==")
# . . push args
68/push "=="/imm32
51/push-ecx
# . . call
e8/call slice-equal?/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# . if (eax != false) break
3d/compare-eax-and 0/imm32/false
# . restore result now that ZF is set
58/pop-to-eax
75/jump-if-!= $num-bytes:end/disp8
$num-bytes:loop-body:
# result += compute-width-of-slice(word-slice)
# . copy result to edx
89/copy 3/mod/direct 2/rm32/edx . . . 0/r32/eax . . # copy eax to edx
# . eax = compute-width-of-slice(word-slice)
# . . push args
51/push-ecx
# . . call
e8/call compute-width-of-slice/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp
# . eax += result
01/add 3/mod/direct 0/rm32/eax . . . 2/r32/edx . . # add edx to eax
e9/jump $num-bytes:loop/disp32
$num-bytes:end:
# . rewind-stream(line)
# . . push args
ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp . . . . 8/disp8 . # push *(ebp+8)
# . . call
e8/call rewind-stream/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp
# . reclaim locals
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# . restore registers
5b/pop-to-ebx
5a/pop-to-edx
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
test-num-bytes-handles-empty-string:
# if a line starts with '#', return 0
# . prologue
55/push-ebp
89/copy 3/mod/direct 5/rm32/ebp . . . 4/r32/esp . . # copy esp to ebp
# setup
# . clear-stream(_test-input-stream)
# . . push args
68/push _test-input-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-output-stream)
# . . push args
68/push _test-output-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
# no contents in input
# eax = num-bytes(_test-input-stream)
# . . push args
68/push _test-input-stream/imm32
# . . call
e8/call num-bytes/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp
# check-ints-equal(eax, 0, msg)
# . . push args
68/push "F - test-num-bytes-handles-empty-string"/imm32
68/push 0/imm32/true
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
# . epilogue
89/copy 3/mod/direct 4/rm32/esp . . . 5/r32/ebp . . # copy ebp to esp
5d/pop-to-ebp
c3/return
test-num-bytes-ignores-comments:
# if a line starts with '#', return 0
# . prologue
55/push-ebp
89/copy 3/mod/direct 5/rm32/ebp . . . 4/r32/esp . . # copy esp to ebp
# setup
# . clear-stream(_test-input-stream)
# . . push args
68/push _test-input-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-output-stream)
# . . push args
68/push _test-output-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
# initialize input
# . write(_test-input-stream, "# abcd")
# . . push args
68/push "# abcd"/imm32
68/push _test-input-stream/imm32
# . . call
e8/call write/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# eax = num-bytes(_test-input-stream)
# . . push args
68/push _test-input-stream/imm32
# . . call
e8/call num-bytes/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp
# check-ints-equal(eax, 0, msg)
# . . push args
68/push "F - test-num-bytes-ignores-comments"/imm32
68/push 0/imm32/true
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
# . epilogue
89/copy 3/mod/direct 4/rm32/esp . . . 5/r32/ebp . . # copy ebp to esp
5d/pop-to-ebp
c3/return
test-num-bytes-ignores-labels:
# if the first word ends with ':', return 0
# . prologue
55/push-ebp
89/copy 3/mod/direct 5/rm32/ebp . . . 4/r32/esp . . # copy esp to ebp
# setup
# . clear-stream(_test-input-stream)
# . . push args
68/push _test-input-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-output-stream)
# . . push args
68/push _test-output-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
# initialize input
# . write(_test-input-stream, "ab: # cd")
# . . push args
68/push "ab: # cd"/imm32
68/push _test-input-stream/imm32
# . . call
e8/call write/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# eax = num-bytes(_test-input-stream)
# . . push args
68/push _test-input-stream/imm32
# . . call
e8/call num-bytes/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp
# check-ints-equal(eax, 0, msg)
# . . push args
68/push "F - test-num-bytes-ignores-labels"/imm32
68/push 0/imm32/true
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
# . epilogue
89/copy 3/mod/direct 4/rm32/esp . . . 5/r32/ebp . . # copy ebp to esp
5d/pop-to-ebp
c3/return
test-num-bytes-ignores-segment-headers:
# if the first word is '==', return 0
# . prologue
55/push-ebp
89/copy 3/mod/direct 5/rm32/ebp . . . 4/r32/esp . . # copy esp to ebp
# setup
# . clear-stream(_test-input-stream)
# . . push args
68/push _test-input-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-output-stream)
# . . push args
68/push _test-output-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
# initialize input
# . write(_test-input-stream, "== ab cd")
# . . push args
68/push "== ab cd"/imm32
68/push _test-input-stream/imm32
# . . call
e8/call write/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# eax = num-bytes(_test-input-stream)
# . . push args
68/push _test-input-stream/imm32
# . . call
e8/call num-bytes/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp
# check-ints-equal(eax, 0, msg)
# . . push args
68/push "F - test-num-bytes-ignores-segment-headers"/imm32
68/push 0/imm32/true
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
# . epilogue
89/copy 3/mod/direct 4/rm32/esp . . . 5/r32/ebp . . # copy ebp to esp
5d/pop-to-ebp
c3/return
test-num-bytes-counts-words-by-default:
# without metadata, count words
# . prologue
55/push-ebp
89/copy 3/mod/direct 5/rm32/ebp . . . 4/r32/esp . . # copy esp to ebp
# setup
# . clear-stream(_test-input-stream)
# . . push args
68/push _test-input-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-output-stream)
# . . push args
68/push _test-output-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
# initialize input
# . write(_test-input-stream, "ab cd ef")
# . . push args
68/push "ab cd ef"/imm32
68/push _test-input-stream/imm32
# . . call
e8/call write/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# eax = num-bytes(_test-input-stream)
# . . push args
68/push _test-input-stream/imm32
# . . call
e8/call num-bytes/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp
# check-ints-equal(eax, 3, msg)
# . . push args
68/push "F - test-num-bytes-counts-words-by-default"/imm32
68/push 3/imm32/true
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
# . epilogue
89/copy 3/mod/direct 4/rm32/esp . . . 5/r32/ebp . . # copy ebp to esp
5d/pop-to-ebp
c3/return
test-num-bytes-ignores-trailing-comment:
# trailing comments appropriately ignored
# . prologue
55/push-ebp
89/copy 3/mod/direct 5/rm32/ebp . . . 4/r32/esp . . # copy esp to ebp
# setup
# . clear-stream(_test-input-stream)
# . . push args
68/push _test-input-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-output-stream)
# . . push args
68/push _test-output-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
# initialize input
# . write(_test-input-stream, "ab cd # ef")
# . . push args
68/push "ab cd # ef"/imm32
68/push _test-input-stream/imm32
# . . call
e8/call write/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# eax = num-bytes(_test-input-stream)
# . . push args
68/push _test-input-stream/imm32
# . . call
e8/call num-bytes/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp
# check-ints-equal(eax, 2, msg)
# . . push args
68/push "F - test-num-bytes-ignores-trailing-comment"/imm32
68/push 2/imm32/true
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
# . epilogue
89/copy 3/mod/direct 4/rm32/esp . . . 5/r32/ebp . . # copy ebp to esp
5d/pop-to-ebp
c3/return
test-num-bytes-handles-imm32:
# if a word has the /imm32 metadata, count it as 4 bytes
# . prologue
55/push-ebp
89/copy 3/mod/direct 5/rm32/ebp . . . 4/r32/esp . . # copy esp to ebp
# setup
# . clear-stream(_test-input-stream)
# . . push args
68/push _test-input-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-output-stream)
# . . push args
68/push _test-output-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
# initialize input
# . write(_test-input-stream, "ab cd/imm32 ef")
# . . push args
68/push "ab cd/imm32 ef"/imm32
68/push _test-input-stream/imm32
# . . call
e8/call write/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp
# eax = num-bytes(_test-input-stream)
# . . push args
68/push _test-input-stream/imm32
# . . call
e8/call num-bytes/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp
# check-ints-equal(eax, 6, msg)
# . . push args
68/push "F - test-num-bytes-handles-imm32"/imm32
68/push 6/imm32/true
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
# . epilogue
89/copy 3/mod/direct 4/rm32/esp . . . 5/r32/ebp . . # copy ebp to esp
5d/pop-to-ebp
c3/return
# . . vim:nowrap:textwidth=0