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Implement is-label?

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nc 2019-06-29 17:58:32 -04:00
parent aa09f29419
commit 0721fb5891
1 changed files with 75 additions and 0 deletions
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subx/apps/survey.subx
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@ -317,6 +317,81 @@ test-convert-computes-addresses:
5d/pop-to-EBP
c3/return
is-label?: # word : (address slice) -> EAX : boolean
# . prolog
55/push-EBP
89/copy 3/mod/direct 5/rm32/EBP . . . 4/r32/ESP . . # copy ESP to EBP
# . save registers
51/push-ECX
# ECX = word
8b/copy 1/mod/*+disp8 5/rm32/EBP . . . 1/r32/ECX 8/disp8 . # copy *(EBP+8) to ECX
# ECX = word->end
8b/copy 1/mod/*+disp8 1/rm32/ECX . . . 1/r32/ECX 4/disp8 . # copy *(ECX+4) to ECX
# *(word->end - 1) == ':'
# . EAX = 0
31/xor 3/mod/direct 0/rm32/EAX . . . 0/r32/EAX . . # clear EAX
# . EAX = *((char *) word->end - 1)
8a/copy-byte 1/mod/*+disp8 1/rm32/ECX . . . 0/r32/AL -1/disp8 . # copy byte at *(ECX-1) to AL
# . (word->end - 1)/EAX == ':'
3d/compare-EAX-and 3A/imm32/colon
b8/copy-to-EAX 1/imm32/true
74/jump-if-equal $is-label?:end/disp8
b8/copy-to-EAX 0/imm32/false
$is-label?:end:
# . restore registers
59/pop-to-ECX
# . epilog
89/copy 3/mod/direct 4/rm32/ESP . . . 5/r32/EBP . . # copy EBP to ESP
5d/pop-to-EBP
c3/return
test-is-label?:
# . prolog
55/push-EBP
89/copy 3/mod/direct 5/rm32/EBP . . . 4/r32/ESP . . # copy ESP to EBP
$test-is-label?:true:
# var slice/ECX = slice("AAA:")
68/push _test-label-slice-end1/imm32
68/push _test-label-slice-start/imm32
89/copy 3/mod/direct 1/rm32/ECX . . . 4/r32/ESP . . # copy ESP to ECX
# is-label?(slice/ECX)
51/push-ECX
e8/call is-label?/disp32
# . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP
# check-ints-equal(EAX, 1, msg)
# . . push args
68/push "F - test-is-label?:true"/imm32
68/push 1/imm32
50/push-EAX
# . . call
e8/call check-ints-equal/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 0xc/imm32 # add to ESP
$test-is-label?:false:
# var slice/ECX = slice("AAA")
68/push _test-label-slice-end2/imm32
68/push _test-label-slice-start/imm32
89/copy 3/mod/direct 1/rm32/ECX . . . 4/r32/ESP . . # copy ESP to ECX
# is-label?(slice/ECX)
51/push-ECX
e8/call is-label?/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-is-label?:false"/imm32
68/push 0/imm32
50/push-EAX
# . . call
e8/call check-ints-equal/disp32
# . . discard args
81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 0xc/imm32 # add to ESP
# . epilog
89/copy 3/mod/direct 4/rm32/ESP . . . 5/r32/EBP . . # copy EBP to ESP
5d/pop-to-EBP
c3/return
compute-offsets: # in : (address buffered-file), segments : (address stream {string, segment-info}), labels : (address stream {string, label-info})
# pseudocode:
# var curr-segment-name = 0