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< title > Mu - 313index-bounds-check.subx< / title >
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< a href = 'https://github.com/akkartik/mu/blob/main/313index-bounds-check.subx' > https://github.com/akkartik/mu/blob/main/313index-bounds-check.subx< / a >
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< pre id = 'vimCodeElement' >
< span id = "L1" class = "LineNr" > 1 < / span > < span class = "subxComment" > # Helper to check an array's bounds, and to abort if they're violated.< / span >
< span id = "L2" class = "LineNr" > 2 < / span > < span class = "subxComment" > # Really only intended to be called from code generated by mu.subx.< / span >
< span id = "L3" class = "LineNr" > 3 < / span >
< span id = "L4" class = "LineNr" > 4 < / span > == code
< span id = "L5" class = "LineNr" > 5 < / span >
< span id = "L6" class = "LineNr" > 6 < / span > < span class = "subxMinorFunction" > __check-mu-array-bounds< / span > : < span class = "subxComment" > # index: int, elem-size: int, arr-size: int, function-name: (addr array byte), array-name: (addr array byte)< / span >
< span id = "L7" class = "LineNr" > 7 < / span > < span class = "subxS1Comment" > # . prologue< / span >
< span id = "L8" class = "LineNr" > 8 < / span > 55/push-ebp
< span id = "L9" class = "LineNr" > 9 < / span > 89/< - %ebp 4/r32/esp
< span id = "L10" class = "LineNr" > 10 < / span > < span class = "subxS1Comment" > # . save registers< / span >
< span id = "L11" class = "LineNr" > 11 < / span > 50/push-eax
< span id = "L12" class = "LineNr" > 12 < / span > 51/push-ecx
< span id = "L13" class = "LineNr" > 13 < / span > 52/push-edx
< span id = "L14" class = "LineNr" > 14 < / span > < span class = "subxS1Comment" > # . not bothering saving ebx; it's only clobbered if we're going to abort< / span >
< span id = "L15" class = "LineNr" > 15 < / span > < span class = "subxComment" > # ecx = arr-size< / span >
< span id = "L16" class = "LineNr" > 16 < / span > 8b/-> *(ebp+0x10) 1/r32/ecx
< span id = "L17" class = "LineNr" > 17 < / span > < span class = "subxComment" > # var overflow/edx: int = 0< / span >
< span id = "L18" class = "LineNr" > 18 < / span > ba/copy-to-edx 0/imm32
< span id = "L19" class = "LineNr" > 19 < / span > < span class = "subxComment" > # var offset/eax: int = index * elem-size< / span >
< span id = "L20" class = "LineNr" > 20 < / span > 8b/-> *(ebp+8) 0/r32/eax
< span id = "L21" class = "LineNr" > 21 < / span > f7 4/subop/multiply-eax-with *(ebp+0xc)
< span id = "L22" class = "LineNr" > 22 < / span > < span class = "subxComment" > # check for overflow< / span >
< span id = "L23" class = "LineNr" > 23 < / span > 81 7/subop/compare %edx 0/imm32
< span id = "L24" class = "LineNr" > 24 < / span > 0f 85/jump-if-!= < a href = '313index-bounds-check.subx.html#L6' > __check-mu-array-bounds< / a > :overflow/disp32
< span id = "L25" class = "LineNr" > 25 < / span > < span class = "subxComment" > # check bounds< / span >
< span id = "L26" class = "LineNr" > 26 < / span > 39/compare %eax 1/r32/ecx
< span id = "L27" class = "LineNr" > 27 < / span > 0f 82/jump-if-unsigned< $__check-mu-array-bounds:end/disp32 < span class = "subxComment" > # negative index should always abort< / span >
< span id = "L28" class = "LineNr" > 28 < / span > < span class = "subxComment" > # abort if necessary< / span >
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< span id = "L29" class = "LineNr" > 29 < / span > (< a href = '501draw-text.mu.html#L339' > draw-text-wrapping-right-then-down-from-cursor-over-full-screen< / a > 0 < span class = "Constant" > " fn " < / span > 3 0) < span class = "subxComment" > # 3=cyan< / span >
< span id = "L30" class = "LineNr" > 30 < / span > (< a href = '501draw-text.mu.html#L339' > draw-text-wrapping-right-then-down-from-cursor-over-full-screen< / a > 0 *(ebp+0x14) 3 0) < span class = "subxComment" > # 3=cyan< / span >
< span id = "L31" class = "LineNr" > 31 < / span > (< a href = '501draw-text.mu.html#L339' > draw-text-wrapping-right-then-down-from-cursor-over-full-screen< / a > 0 < span class = "Constant" > " : offset " < / span > 3 0) < span class = "subxComment" > # 3=cyan< / span >
< span id = "L32" class = "LineNr" > 32 < / span > (< a href = '501draw-text.mu.html#L394' > draw-int32-hex-wrapping-right-then-down-from-cursor-over-full-screen< / a > 0 %eax 3 0) < span class = "subxComment" > # 3=cyan< / span >
< span id = "L33" class = "LineNr" > 33 < / span > (< a href = '501draw-text.mu.html#L339' > draw-text-wrapping-right-then-down-from-cursor-over-full-screen< / a > 0 < span class = "Constant" > " is too large for array '" < / span > 3 0) < span class = "subxComment" > # 3=cyan< / span >
< span id = "L34" class = "LineNr" > 34 < / span > (< a href = '501draw-text.mu.html#L339' > draw-text-wrapping-right-then-down-from-cursor-over-full-screen< / a > 0 *(ebp+0x18) 3 0) < span class = "subxComment" > # 3=cyan< / span >
< span id = "L35" class = "LineNr" > 35 < / span > (< a href = '501draw-text.mu.html#L339' > draw-text-wrapping-right-then-down-from-cursor-over-full-screen< / a > 0 < span class = "Constant" > " '" < / span > 3 0) < span class = "subxComment" > # 3=cyan< / span >
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< span id = "L36" class = "LineNr" > 36 < / span > (< a href = '317abort.subx.html#L5' > abort< / a > < span class = "Constant" > " " < / span > )
< span id = "L37" class = "LineNr" > 37 < / span > < span class = "subxComment" > # never gets here< / span >
< span id = "L38" class = "LineNr" > 38 < / span > < span class = "Constant" > $__check-mu-array-bounds:end< / span > :
< span id = "L39" class = "LineNr" > 39 < / span > < span class = "subxS1Comment" > # . restore registers< / span >
< span id = "L40" class = "LineNr" > 40 < / span > 5a/pop-to-edx
< span id = "L41" class = "LineNr" > 41 < / span > 59/pop-to-ecx
< span id = "L42" class = "LineNr" > 42 < / span > 58/pop-to-eax
< span id = "L43" class = "LineNr" > 43 < / span > < span class = "subxS1Comment" > # . epilogue< / span >
< span id = "L44" class = "LineNr" > 44 < / span > 89/< - %esp 5/r32/ebp
< span id = "L45" class = "LineNr" > 45 < / span > 5d/pop-to-ebp
< span id = "L46" class = "LineNr" > 46 < / span > c3/return
< span id = "L47" class = "LineNr" > 47 < / span >
< span id = "L48" class = "LineNr" > 48 < / span > < span class = "subxMinorFunction" > __check-mu-array-bounds:overflow< / span > :
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< span id = "L49" class = "LineNr" > 49 < / span > (< a href = '501draw-text.mu.html#L339' > draw-text-wrapping-right-then-down-from-cursor-over-full-screen< / a > 0 < span class = "Constant" > " fn " < / span > 3 0) < span class = "subxComment" > # 3=cyan< / span >
< span id = "L50" class = "LineNr" > 50 < / span > (< a href = '501draw-text.mu.html#L339' > draw-text-wrapping-right-then-down-from-cursor-over-full-screen< / a > 0 *(ebp+0x14) 3 0) < span class = "subxComment" > # 3=cyan< / span >
< span id = "L51" class = "LineNr" > 51 < / span > (< a href = '501draw-text.mu.html#L339' > draw-text-wrapping-right-then-down-from-cursor-over-full-screen< / a > 0 < span class = "Constant" > " : offset to array '" < / span > 3 0) < span class = "subxComment" > # 3=cyan< / span >
< span id = "L52" class = "LineNr" > 52 < / span > (< a href = '501draw-text.mu.html#L339' > draw-text-wrapping-right-then-down-from-cursor-over-full-screen< / a > 0 *(ebp+0x18) 3 0) < span class = "subxComment" > # 3=cyan< / span >
< span id = "L53" class = "LineNr" > 53 < / span > (< a href = '501draw-text.mu.html#L339' > draw-text-wrapping-right-then-down-from-cursor-over-full-screen< / a > 0 < span class = "Constant" > " ' overflowed 32 bits" < / span > 3 0) < span class = "subxComment" > # 3=cyan< / span >
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< span id = "L54" class = "LineNr" > 54 < / span > (< a href = '317abort.subx.html#L5' > abort< / a > < span class = "Constant" > " " < / span > )
< span id = "L55" class = "LineNr" > 55 < / span > < span class = "subxComment" > # never gets here< / span >
< span id = "L56" class = "LineNr" > 56 < / span >
< span id = "L57" class = "LineNr" > 57 < / span > < span class = "subxMinorFunction" > __mu-abort-null-index-base-address< / span > :
< span id = "L58" class = "LineNr" > 58 < / span > (< a href = '317abort.subx.html#L5' > abort< / a > < span class = "Constant" > " null address in 'index'" < / span > )
< span id = "L59" class = "LineNr" > 59 < / span >
< span id = "L60" class = "LineNr" > 60 < / span > < span class = "subxMinorFunction" > __mu-abort-null-get-base-address< / span > :
< span id = "L61" class = "LineNr" > 61 < / span > (< a href = '317abort.subx.html#L5' > abort< / a > < span class = "Constant" > " null address in 'get'" < / span > )
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