433 lines
11 KiB
Plaintext
433 lines
11 KiB
Plaintext
# Comparing arrays of numbers.
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== code
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array-equal?: # a: (addr array int), b: (addr array int) -> result/eax: boolean
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# pseudocode:
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# asize = a->size
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# if (asize != b->size) return false
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# i = 0
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# curra = a->data
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# currb = b->data
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# while i < asize
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# i1 = *curra
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# i2 = *currb
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# if (c1 != c2) return false
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# i+=4, curra+=4, currb+=4
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# return true
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#
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# registers:
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# i: ecx
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# asize: edx
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# curra: esi
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# currb: edi
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# i1: eax
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# i2: ebx
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#
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# . prologue
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55/push-ebp
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89/<- %ebp 4/r32/esp
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# . save registers
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51/push-ecx
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52/push-edx
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53/push-ebx
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56/push-esi
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57/push-edi
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# esi = a
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8b/-> *(ebp+8) 6/r32/esi
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# edi = b
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8b/-> *(ebp+0xc) 7/r32/edi
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# var asize/edx: int = a->size
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8b/-> *esi 2/r32/edx
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$array-equal?:sizes:
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# if (asize != b->size) return false
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39/compare *edi 2/r32/edx
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75/jump-if-!= $array-equal?:false/disp8
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# var curra/esi: (addr byte) = a->data
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81 0/subop/add %esi 4/imm32
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# var currb/edi: (addr byte) = b->data
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81 0/subop/add %edi 4/imm32
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# var i/ecx: int = 0
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31/xor-with %ecx 1/r32/ecx
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# var vala/eax: int
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# var valb/ebx: int
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$array-equal?:loop:
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# if (i >= asize) return true
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39/compare %ecx 2/r32/edx
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7d/jump-if->= $array-equal?:true/disp8
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# var vala/eax: int = *curra
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8b/-> *esi 0/r32/eax
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# var valb/ebx: int = *currb
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8b/-> *edi 3/r32/ebx
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# if (vala != valb) return false
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39/compare %eax 3/r32/ebx
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75/jump-if-!= $array-equal?:false/disp8
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# i += 4
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81 0/subop/add %ecx 4/imm32
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# currs += 4
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81 0/subop/add %esi 4/imm32
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# currb += 4
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81 0/subop/add %edi 4/imm32
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eb/jump $array-equal?:loop/disp8
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$array-equal?:true:
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b8/copy-to-eax 1/imm32
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eb/jump $array-equal?:end/disp8
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$array-equal?:false:
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b8/copy-to-eax 0/imm32
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$array-equal?:end:
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# . restore registers
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5f/pop-to-edi
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5e/pop-to-esi
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5b/pop-to-ebx
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5a/pop-to-edx
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59/pop-to-ecx
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# . epilogue
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89/<- %esp 5/r32/ebp
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5d/pop-to-ebp
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c3/return
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test-compare-empty-with-empty-array:
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# . prologue
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55/push-ebp
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89/<- %ebp 4/r32/esp
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# var ecx: (array _) = []
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68/push 0/imm32/size
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89/<- %ecx 4/r32/esp
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# var edx: (array _) = []
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68/push 0/imm32/size
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89/<- %edx 4/r32/esp
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#
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(array-equal? %ecx %edx) # => eax
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(check-ints-equal %eax 1 "F - test-compare-empty-with-empty-array")
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# . epilogue
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89/<- %esp 5/r32/ebp
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5d/pop-to-ebp
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c3/return
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test-compare-empty-with-non-empty-array: # also checks size-mismatch code path
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# . prologue
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55/push-ebp
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89/<- %ebp 4/r32/esp
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# var ecx: (array int) = [1]
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68/push 1/imm32
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68/push 4/imm32/size
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89/<- %ecx 4/r32/esp
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# var edx: (array int) = []
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68/push 0/imm32/size
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89/<- %edx 4/r32/esp
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#
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(array-equal? %ecx %edx) # => eax
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(check-ints-equal %eax 0 "F - test-compare-empty-with-non-empty-array")
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# . epilogue
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89/<- %esp 5/r32/ebp
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5d/pop-to-ebp
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c3/return
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test-compare-equal-arrays:
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# . prologue
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55/push-ebp
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89/<- %ebp 4/r32/esp
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# var ecx: (array int) = [1, 2, 3]
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68/push 3/imm32
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68/push 2/imm32
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68/push 1/imm32
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68/push 0xc/imm32/size
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89/<- %ecx 4/r32/esp
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# var edx: (array int) = [1, 2, 3]
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68/push 3/imm32
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68/push 2/imm32
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68/push 1/imm32
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68/push 0xc/imm32/size
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89/<- %edx 4/r32/esp
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#
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(array-equal? %ecx %edx) # => eax
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(check-ints-equal %eax 1 "F - test-compare-equal-arrays")
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# . epilogue
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89/<- %esp 5/r32/ebp
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5d/pop-to-ebp
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c3/return
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test-compare-inequal-arrays-equal-sizes:
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# . prologue
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55/push-ebp
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89/<- %ebp 4/r32/esp
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# var ecx: (array int) = [1, 4, 3]
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68/push 3/imm32
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68/push 4/imm32
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68/push 1/imm32
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68/push 0xc/imm32/size
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89/<- %ecx 4/r32/esp
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# var edx: (array int) = [1, 2, 3]
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68/push 3/imm32
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68/push 2/imm32
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68/push 1/imm32
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68/push 0xc/imm32/size
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89/<- %edx 4/r32/esp
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#
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(array-equal? %ecx %edx) # => eax
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(check-ints-equal %eax 0 "F - test-compare-inequal-arrays-equal-sizes")
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# . epilogue
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89/<- %esp 5/r32/ebp
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5d/pop-to-ebp
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c3/return
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_parse-array-of-ints: # ad: (addr allocation-descriptor), s: (addr array byte), out: (addr handle array int)
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# pseudocode
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# end = &s->data[s->size]
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# curr = s->data
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# size = 0
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# while true
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# if (curr >= end) break
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# curr = skip-chars-matching-in-slice(curr, end, ' ')
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# if (curr >= end) break
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# curr = skip-chars-not-matching-in-slice(curr, end, ' ')
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# ++size
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# allocate-array(ad, size*4, out)
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# var slice: slice = {s->data, 0}
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# curr = lookup(out)->data
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# while true
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# if (slice->start >= end) break
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# slice->start = skip-chars-matching-in-slice(slice->start, end, ' ')
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# if (slice->start >= end) break
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# slice->end = skip-chars-not-matching-in-slice(slice->start, end, ' ')
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# *curr = parse-hex-int-from-slice(slice)
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# curr += 4
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# slice->start = slice->end
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# return result
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#
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# . prologue
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55/push-ebp
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89/<- %ebp 4/r32/esp
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# . save registers
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50/push-eax
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51/push-ecx
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52/push-edx
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53/push-ebx
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56/push-esi
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57/push-edi
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# esi = s
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8b/-> *(ebp+0xc) 6/r32/esi
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# var curr/ecx: (addr byte) = s->data
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8d/copy-address *(esi+4) 1/r32/ecx
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# var end/edx: (addr byte) = &s->data[s->size]
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# . edx = s->size
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8b/-> *esi 2/r32/edx
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# . edx += curr
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01/add-to %edx 1/r32/ecx
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# var size/ebx: int = 0
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31/xor-with %ebx 3/r32/ebx
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$_parse-array-of-ints:loop1:
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# if (curr >= end) break
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39/compare %ecx 2/r32/edx
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73/jump-if-addr>= $_parse-array-of-ints:break1/disp8
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# curr = skip-chars-matching-in-slice(curr, end, ' ')
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(skip-chars-matching-in-slice %ecx %edx 0x20) # => eax
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89/<- %ecx 0/r32/eax
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# if (curr >= end) break
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39/compare %ecx 2/r32/edx
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73/jump-if-addr>= $_parse-array-of-ints:break1/disp8
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# curr = skip-chars-not-matching-in-slice(curr, end, ' ')
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(skip-chars-not-matching-in-slice %ecx %edx 0x20) # => eax
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89/<- %ecx 0/r32/eax
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# size += 4
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81 0/subop/add %ebx 4/imm32
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eb/jump $_parse-array-of-ints:loop1/disp8
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$_parse-array-of-ints:break1:
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(allocate-array *(ebp+8) %ebx *(ebp+0x10))
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$_parse-array-of-ints:pass2:
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# var slice/edi: slice = {s->data, 0}
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68/push 0/imm32/end
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8d/copy-address *(esi+4) 7/r32/edi
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57/push-edi
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89/<- %edi 4/r32/esp
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# curr = lookup(out)->data
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8b/-> *(ebp+0x10) 0/r32/eax
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(lookup *eax *(eax+4)) # => eax
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8d/copy-address *(eax+4) 1/r32/ecx
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$_parse-array-of-ints:loop2:
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# if (slice->start >= end) break
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39/compare *edi 2/r32/edx
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73/jump-if-addr>= $_parse-array-of-ints:end/disp8
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# slice->start = skip-chars-matching-in-slice(slice->start, end, ' ')
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(skip-chars-matching-in-slice *edi %edx 0x20) # => eax
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89/<- *edi 0/r32/eax
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# if (slice->start >= end) break
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39/compare *edi 2/r32/edx
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73/jump-if-addr>= $_parse-array-of-ints:end/disp8
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# slice->end = skip-chars-not-matching-in-slice(slice->start, end, ' ')
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(skip-chars-not-matching-in-slice *edi %edx 0x20) # => eax
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89/<- *(edi+4) 0/r32/eax
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# *curr = parse-hex-int-from-slice(slice)
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(parse-hex-int-from-slice %edi)
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89/<- *ecx 0/r32/eax
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# curr += 4
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81 0/subop/add %ecx 4/imm32
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# slice->start = slice->end
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8b/-> *(edi+4) 0/r32/eax
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89/<- *edi 0/r32/eax
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eb/jump $_parse-array-of-ints:loop2/disp8
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$_parse-array-of-ints:end:
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# . reclaim locals
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81 0/subop/add %esp 8/imm32
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# . restore registers
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5f/pop-to-edi
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5e/pop-to-esi
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5b/pop-to-ebx
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5a/pop-to-edx
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59/pop-to-ecx
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58/pop-to-eax
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# . epilogue
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89/<- %esp 5/r32/ebp
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5d/pop-to-ebp
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c3/return
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test-parse-array-of-ints:
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# . prologue
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55/push-ebp
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89/<- %ebp 4/r32/esp
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# var h/esi: (handle array int)
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68/push 0/imm32
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68/push 0/imm32
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89/<- %esi 4/r32/esp
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# var ecx: (array int) = [1, 2, 3]
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68/push 3/imm32
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68/push 2/imm32
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68/push 1/imm32
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68/push 0xc/imm32/size
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89/<- %ecx 4/r32/esp
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#
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(_parse-array-of-ints Heap "1 2 3" %esi)
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(lookup *esi *(esi+4)) # => eax
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(array-equal? %ecx %eax) # => eax
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(check-ints-equal %eax 1 "F - test-parse-array-of-ints")
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# . epilogue
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89/<- %esp 5/r32/ebp
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5d/pop-to-ebp
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c3/return
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test-parse-array-of-ints-empty:
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# - empty string = empty array
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# . prologue
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55/push-ebp
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89/<- %ebp 4/r32/esp
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# var h/esi: handle
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68/push 0/imm32
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68/push 0/imm32
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89/<- %esi 4/r32/esp
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#
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(_parse-array-of-ints Heap "" %esi)
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(lookup *esi *(esi+4)) # => eax
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(check-ints-equal *eax 0 "F - test-parse-array-of-ints-empty")
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# . epilogue
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89/<- %esp 5/r32/ebp
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5d/pop-to-ebp
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c3/return
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test-parse-array-of-ints-just-whitespace:
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# - just whitespace = empty array
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# . prologue
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55/push-ebp
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89/<- %ebp 4/r32/esp
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# var h/esi: handle
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68/push 0/imm32
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68/push 0/imm32
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89/<- %esi 4/r32/esp
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#
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(_parse-array-of-ints Heap Space %esi)
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(lookup *esi *(esi+4)) # => eax
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(check-ints-equal *eax 0 "F - test-parse-array-of-ints-just-whitespace")
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# . epilogue
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89/<- %esp 5/r32/ebp
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5d/pop-to-ebp
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c3/return
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test-parse-array-of-ints-extra-whitespace:
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# . prologue
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55/push-ebp
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89/<- %ebp 4/r32/esp
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# var h/esi: handle
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68/push 0/imm32
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68/push 0/imm32
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89/<- %esi 4/r32/esp
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# var ecx: (array int) = [1, 2, 3]
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68/push 3/imm32
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68/push 2/imm32
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68/push 1/imm32
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68/push 0xc/imm32/size
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89/<- %ecx 4/r32/esp
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#
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(_parse-array-of-ints Heap " 1 2 3 " %esi)
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(lookup *esi *(esi+4)) # => eax
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(array-equal? %ecx %eax) # => eax
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(check-ints-equal %eax 1 "F - test-parse-array-of-ints-extra-whitespace")
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# . epilogue
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89/<- %esp 5/r32/ebp
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5d/pop-to-ebp
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c3/return
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parse-array-of-ints: # s: (addr array byte), out: (addr handle array int)
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# . prologue
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55/push-ebp
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89/<- %ebp 4/r32/esp
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#
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(_parse-array-of-ints Heap *(ebp+8) *(ebp+0xc))
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$parse-array-of-ints:end:
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# . epilogue
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89/<- %esp 5/r32/ebp
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5d/pop-to-ebp
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c3/return
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# helper for later tests
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# compare an array with a string representation of an array literal
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check-array-equal: # a: (addr array int), expected: (addr string), msg: (addr string)
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# . prologue
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55/push-ebp
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89/<- %ebp 4/r32/esp
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# . save registers
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50/push-eax
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56/push-esi
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# var h/esi: handle
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68/push 0/imm32
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68/push 0/imm32
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89/<- %esi 4/r32/esp
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# var b/eax: (addr array int) = parse-array-of-ints(Heap, expected)
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(parse-array-of-ints *(ebp+0xc) %esi)
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(lookup *esi *(esi+4)) # => eax
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#
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(array-equal? *(ebp+8) %eax)
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(check-ints-equal %eax 1 *(ebp+0x10))
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$check-array-equal:end:
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# . restore registers
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5e/pop-to-esi
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58/pop-to-eax
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# . epilogue
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89/<- %esp 5/r32/ebp
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5d/pop-to-ebp
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c3/return
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test-check-array-equal:
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# . prologue
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55/push-ebp
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89/<- %ebp 4/r32/esp
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# var ecx: (array int) = [1, 2, 3]
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68/push 3/imm32
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68/push 2/imm32
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68/push 1/imm32
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68/push 0xc/imm32/size
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89/<- %ecx 4/r32/esp
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#
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(check-array-equal %ecx "1 2 3" "F - test-check-array-equal")
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# . epilogue
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89/<- %esp 5/r32/ebp
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5d/pop-to-ebp
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c3/return
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== data
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# length-prefixed string containing just a single space
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Space: # (array byte)
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# size: int
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1/imm32
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# data
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20/space
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