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# Helpers for decimal ints.
# if slice doesn't contain a decimal number, return 0
parse-decimal-int-from-slice: # in: (addr slice) -> out/eax: int
# . prologue
55/push-ebp
89/<- %ebp 4/r32/esp
# . save registers
51/push-ecx
# ecx = in
8b/-> *(ebp+8) 1/r32/ecx
#
(parse-decimal-int-helper *ecx *(ecx+4)) # => eax
$parse-decimal-int-from-slice:end:
# . restore registers
59/pop-to-ecx
# . epilogue
89/<- %esp 5/r32/ebp
5d/pop-to-ebp
c3/return
# if slice doesn't contain a decimal number, return 0
parse-decimal-int: # in: (addr array byte) -> result/eax: int
# . prologue
55/push-ebp
89/<- %ebp 4/r32/esp
# . save registers
51/push-ecx
52/push-edx
# eax = in
8b/-> *(ebp+8) 0/r32/eax
# var start/ecx: (addr byte) = &in->data
8d/copy-address *(eax+4) 1/r32/ecx
# var end/edx: (addr byte) = &in->data[in->size]
8b/-> *eax 2/r32/edx
8d/copy-address *(eax+edx+4) 2/r32/edx
#
(parse-decimal-int-helper %ecx %edx) # => eax
$parse-decimal-int:end:
# . restore registers
5a/pop-to-edx
59/pop-to-ecx
# . epilogue
89/<- %esp 5/r32/ebp
5d/pop-to-ebp
c3/return
parse-decimal-int-from-stream: # in: (addr stream byte) -> result/eax: int
# . prologue
55/push-ebp
89/<- %ebp 4/r32/esp
# . save registers
51/push-ecx
52/push-edx
# eax = in
8b/-> *(ebp+8) 0/r32/eax
# var start/ecx: (addr byte) = &in->data[in->read]
8b/-> *(eax+4) 1/r32/ecx
8d/copy-address *(eax+ecx+0xc) 1/r32/ecx
# var end/edx: (addr byte) = &in->data[in->write]
8b/-> *eax 2/r32/edx
8d/copy-address *(eax+edx+0xc) 2/r32/edx
#
(parse-decimal-int-helper %ecx %edx) # => eax
$parse-decimal-int-from-stream:end:
# . restore registers
5a/pop-to-edx
59/pop-to-ecx
# . epilogue
89/<- %esp 5/r32/ebp
5d/pop-to-ebp
c3/return
parse-decimal-int-helper: # start: (addr byte), end: (addr byte) -> result/eax: int
# . prologue
55/push-ebp
89/<- %ebp 4/r32/esp
# . save registers
51/push-ecx
52/push-edx
53/push-ebx
56/push-esi
57/push-edi
# var curr/esi: (addr byte) = start
8b/-> *(ebp+8) 6/r32/esi
# edi = end
8b/-> *(ebp+0xc) 7/r32/edi
# var negate?/edx: boolean = false
ba/copy-to-edx 0/imm32/false
# if (*curr == '-') ++curr, negate = true
{
$parse-decimal-int-helper:negative:
b8/copy-to-eax 0/imm32
8a/copy-byte *esi 0/r32/AL
3d/compare-eax-and 0x2d/imm32/-
75/jump-if-!= break/disp8
# . ++curr
46/increment-esi
# . negate = true
ba/copy-to-edx 1/imm32/true
}
# spill negate?
52/push-edx
# var result/eax: int = 0
b8/copy-to-eax 0/imm32
# var digit/ecx: int = 0
b9/copy-to-ecx 0/imm32
# const TEN/ebx: int = 10
bb/copy-to-ebx 0xa/imm32
{
$parse-decimal-int-helper:loop:
# if (curr >= in->end) break
39/compare %esi 7/r32/edi
73/jump-if-addr>= break/disp8
# if !is-decimal-digit?(*curr) return 0
8a/copy-byte *esi 1/r32/CL
50/push-eax
(is-decimal-digit? %ecx) # => eax
{
3d/compare-eax-and 0/imm32/false
75/jump-if-!= break/disp8
58/pop-to-eax
b8/copy-to-eax 0/imm32
eb/jump $parse-decimal-int-helper:negate/disp8
}
58/pop-to-eax
# digit = from-decimal-char(*curr)
81 5/subop/subtract %ecx 0x30/imm32/zero
# TODO: error checking
# result = result * 10 + digit
ba/copy-to-edx 0/imm32
f7 4/subop/multiply-into-edx-eax %ebx
# TODO: check edx for overflow
01/add %eax 1/r32/ecx
# ++curr
46/increment-esi
#
eb/jump loop/disp8
}
$parse-decimal-int-helper:negate:
# if (negate?) result = -result
5a/pop-to-edx
{
81 7/subop/compare %edx 0/imm32/false
74/jump-if-= break/disp8
f7 3/subop/negate %eax
}
$parse-decimal-int-helper:end:
# . restore registers
5f/pop-to-edi
5e/pop-to-esi
5b/pop-to-ebx
5a/pop-to-edx
59/pop-to-ecx
# . epilogue
89/<- %esp 5/r32/ebp
5d/pop-to-ebp
c3/return
test-parse-decimal-int-from-slice-single-digit:
# . prologue
55/push-ebp
89/<- %ebp 4/r32/esp
# . save registers
50/push-eax
51/push-ecx
# (eax..ecx) = "3"
b8/copy-to-eax "3"/imm32
8b/-> *eax 1/r32/ecx
8d/copy-address *(eax+ecx+4) 1/r32/ecx
05/add-to-eax 4/imm32
# var slice/ecx: slice = {eax, ecx}
51/push-ecx
50/push-eax
89/<- %ecx 4/r32/esp
#
(parse-decimal-int-from-slice %ecx) # => eax
(check-ints-equal %eax 3 "F - test-parse-decimal-int-from-slice-single-digit")
$test-parse-decimal-int-helper-single-digit:end:
# . restore registers
59/pop-to-ecx
58/pop-to-eax
# . epilogue
89/<- %esp 5/r32/ebp
5d/pop-to-ebp
c3/return
test-parse-decimal-int-from-slice-multi-digit:
# . prologue
55/push-ebp
89/<- %ebp 4/r32/esp
# . save registers
50/push-eax
51/push-ecx
# (eax..ecx) = "34"
b8/copy-to-eax "34"/imm32
8b/-> *eax 1/r32/ecx
8d/copy-address *(eax+ecx+4) 1/r32/ecx
05/add-to-eax 4/imm32
# var slice/ecx: slice = {eax, ecx}
51/push-ecx
50/push-eax
89/<- %ecx 4/r32/esp
#
(parse-decimal-int-from-slice %ecx) # => eax
(check-ints-equal %eax 0x22 "F - test-parse-decimal-int-from-slice-multi-digit") # 34 in hex
$test-parse-decimal-int-helper-multi-digit:end:
# . restore registers
59/pop-to-ecx
58/pop-to-eax
# . epilogue
89/<- %esp 5/r32/ebp
5d/pop-to-ebp
c3/return
test-parse-decimal-int-from-slice-zero:
# . prologue
55/push-ebp
89/<- %ebp 4/r32/esp
# . save registers
50/push-eax
51/push-ecx
# (eax..ecx) = "00"
b8/copy-to-eax "00"/imm32
8b/-> *eax 1/r32/ecx
8d/copy-address *(eax+ecx+4) 1/r32/ecx
05/add-to-eax 4/imm32
# var slice/ecx: slice = {eax, ecx}
51/push-ecx
50/push-eax
89/<- %ecx 4/r32/esp
#
(parse-decimal-int-from-slice %ecx) # => eax
(check-ints-equal %eax 0 "F - test-parse-decimal-int-from-slice-zero")
$test-parse-decimal-int-helper-zero:end:
# . restore registers
59/pop-to-ecx
58/pop-to-eax
# . epilogue
89/<- %esp 5/r32/ebp
5d/pop-to-ebp
c3/return
test-parse-decimal-int-from-slice-negative:
# . prologue
55/push-ebp
89/<- %ebp 4/r32/esp
# . save registers
50/push-eax
51/push-ecx
# (eax..ecx) = "-3"
b8/copy-to-eax "-3"/imm32
8b/-> *eax 1/r32/ecx
8d/copy-address *(eax+ecx+4) 1/r32/ecx
05/add-to-eax 4/imm32
# var slice/ecx: slice = {eax, ecx}
51/push-ecx
50/push-eax
89/<- %ecx 4/r32/esp
#
(parse-decimal-int-from-slice %ecx) # => eax
(check-ints-equal %eax -3 "F - test-parse-decimal-int-from-slice-negative")
$test-parse-decimal-int-helper-negative:end:
# . restore registers
59/pop-to-ecx
58/pop-to-eax
# . epilogue
89/<- %esp 5/r32/ebp
5d/pop-to-ebp
c3/return
test-parse-decimal-int-from-slice-multi-digit-negative:
# . prologue
55/push-ebp
89/<- %ebp 4/r32/esp
# . save registers
50/push-eax
51/push-ecx
# (eax..ecx) = "-32"
b8/copy-to-eax "-32"/imm32
8b/-> *eax 1/r32/ecx
8d/copy-address *(eax+ecx+4) 1/r32/ecx
05/add-to-eax 4/imm32
# var slice/ecx: slice = {eax, ecx}
51/push-ecx
50/push-eax
89/<- %ecx 4/r32/esp
#
(parse-decimal-int-from-slice %ecx) # => eax
(check-ints-equal %eax -0x20 "F - test-parse-decimal-int-from-slice-multi-digit-negative") # -32 in hex
$test-parse-decimal-int-helper-multi-digit-negative:end:
# . restore registers
59/pop-to-ecx
58/pop-to-eax
# . epilogue
89/<- %esp 5/r32/ebp
5d/pop-to-ebp
c3/return
decimal-size: # n: int -> result/eax: int
# pseudocode:
# edi = 0
# eax = n
# if eax < 0
# ++edi # for '-'
# negate eax
# while true
# edx = 0
# eax, edx = eax/10, eax%10
# ++edi
# if (eax == 0) break
# eax = edi
#
# . prologue
55/push-ebp
89/<- %ebp 4/r32/esp
# . save registers
51/push-ecx
52/push-edx
57/push-edi
# edi = 0
bf/copy-to-edi 0/imm32
# eax = n
8b/-> *(ebp+8) 0/r32/eax
# if (n < 0) negate n, increment edi
{
3d/compare-eax-with 0/imm32
7d/jump-if->= break/disp8
f7 3/subop/negate %eax
47/increment-edi
}
# const ten/ecx = 10
b9/copy-to-ecx 0xa/imm32
{
ba/copy-to-edx 0/imm32
f7 7/subop/idiv-edx-eax-by %ecx # eax = edx:eax/10; edx = edx:eax%10
47/increment-edi
3d/compare-eax-and 0/imm32
75/jump-if-!= loop/disp8
}
$decimal-size:end:
89/<- %eax 7/r32/edi
# . restore registers
5f/pop-to-edi
5a/pop-to-edx
59/pop-to-ecx
# . epilogue
89/<- %esp 5/r32/ebp
5d/pop-to-ebp
c3/return
test-decimal-size-of-zero:
# . prologue
55/push-ebp
89/<- %ebp 4/r32/esp
#
(decimal-size 0) # => eax
(check-ints-equal %eax 1 "F - test-decimal-size-of-zero")
$test-decimal-size-of-zero:end:
# . epilogue
89/<- %esp 5/r32/ebp
5d/pop-to-ebp
c3/return
test-decimal-size-single-digit:
# . prologue
55/push-ebp
89/<- %ebp 4/r32/esp
#
(decimal-size 4) # => eax
(check-ints-equal %eax 1 "F - test-decimal-size-single-digit")
$test-decimal-size-single-digit:end:
# . epilogue
89/<- %esp 5/r32/ebp
5d/pop-to-ebp
c3/return
test-decimal-size-multi-digit:
# . prologue
55/push-ebp
89/<- %ebp 4/r32/esp
#
(decimal-size 0xa) # => eax
(check-ints-equal %eax 2 "F - test-decimal-size-multi-digit")
$test-decimal-size-multi-digit:end:
# . epilogue
89/<- %esp 5/r32/ebp
5d/pop-to-ebp
c3/return
test-decimal-size-single-digit-negative:
# . prologue
55/push-ebp
89/<- %ebp 4/r32/esp
#
(decimal-size -4) # => eax
(check-ints-equal %eax 2 "F - test-decimal-size-single-digit-negative")
$test-decimal-size-single-digit-negative:end:
# . epilogue
89/<- %esp 5/r32/ebp
5d/pop-to-ebp
c3/return
test-decimal-size-multi-digit-negative:
# . prologue
55/push-ebp
89/<- %ebp 4/r32/esp
#
(decimal-size -0xa) # => eax
(check-ints-equal %eax 3 "F - test-decimal-size-multi-digit-negative")
$test-decimal-size-multi-digit-negative:end:
# . epilogue
89/<- %esp 5/r32/ebp
5d/pop-to-ebp
c3/return
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