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< title > Mu - linux/factorial3.subx< / title >
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< a href = 'https://github.com/akkartik/mu/blob/main/linux/factorial3.subx' > https://github.com/akkartik/mu/blob/main/linux/factorial3.subx< / a >
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< span id = "L1" class = "LineNr" > 1 < / span > < span class = "subxComment" > ## compute the factorial of 5, and return the result in the exit code< / span >
< span id = "L2" class = "LineNr" > 2 < / span > < span class = "subxComment" > #< / span >
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< span id = "L3" class = "LineNr" > 3 < / span > < span class = "subxComment" > # Uses syntax sugar for:< / span >
< span id = "L4" class = "LineNr" > 4 < / span > < span class = "subxComment" > # rm32 operands< / span >
< span id = "L5" class = "LineNr" > 5 < / span > < span class = "subxComment" > # function calls< / span >
< span id = "L6" class = "LineNr" > 6 < / span > < span class = "subxComment" > #< / span >
< span id = "L7" class = "LineNr" > 7 < / span > < span class = "subxComment" > # To run:< / span >
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< span id = "L8" class = "LineNr" > 8 < / span > < span class = "subxComment" > # $ ./translate_subx init.linux [01]*.subx factorial.subx -o factorial< / span >
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< span id = "L9" class = "LineNr" > 9 < / span > < span class = "subxComment" > # $ bootstrap/bootstrap run factorial< / span >
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< span id = "L10" class = "LineNr" > 10 < / span > < span class = "subxComment" > # Expected result:< / span >
< span id = "L11" class = "LineNr" > 11 < / span > < span class = "subxComment" > # $ echo $?< / span >
< span id = "L12" class = "LineNr" > 12 < / span > < span class = "subxComment" > # 120< / span >
< span id = "L13" class = "LineNr" > 13 < / span > < span class = "subxComment" > #< / span >
< span id = "L14" class = "LineNr" > 14 < / span > < span class = "subxComment" > # You can also run the automated test suite:< / span >
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< span id = "L15" class = "LineNr" > 15 < / span > < span class = "subxComment" > # $ bootstrap/bootstrap run factorial test< / span >
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< span id = "L16" class = "LineNr" > 16 < / span > < span class = "subxComment" > # Expected output:< / span >
< span id = "L17" class = "LineNr" > 17 < / span > < span class = "subxComment" > # ........< / span >
< span id = "L18" class = "LineNr" > 18 < / span > < span class = "subxComment" > # Every '.' indicates a passing test. Failing tests get a 'F'.< / span >
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< span id = "L19" class = "LineNr" > 19 < / span > < span class = "subxComment" > #< / span >
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< span id = "L20" class = "LineNr" > 20 < / span > < span class = "subxComment" > # Compare factorial2.subx< / span >
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< span id = "L21" class = "LineNr" > 21 < / span >
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< span id = "L22" class = "LineNr" > 22 < / span > == code
< span id = "L23" class = "LineNr" > 23 < / span >
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< span id = "L24" class = "LineNr" > 24 < / span > < span class = "subxFunction" > factorial< / span > : < span class = "subxComment" > # n: int -> _/eax: int< / span >
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< span id = "L25" class = "LineNr" > 25 < / span > < span class = "subxS1Comment" > # . prologue< / span >
< span id = "L26" class = "LineNr" > 26 < / span > 55/push-ebp
< span id = "L27" class = "LineNr" > 27 < / span > 89/< - %ebp 4/r32/esp
< span id = "L28" class = "LineNr" > 28 < / span > < span class = "subxComment" > # save registers< / span >
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< span id = "L29" class = "LineNr" > 29 < / span > 51/push-ecx
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< span id = "L30" class = "LineNr" > 30 < / span > < span class = "subxComment" > # if (n < = 1) return 1< / span >
< span id = "L31" class = "LineNr" > 31 < / span > b8/copy-to-eax 1/imm32
< span id = "L32" class = "LineNr" > 32 < / span > 81 7/subop/compare *(ebp+8) 1/imm32
< span id = "L33" class = "LineNr" > 33 < / span > 7e/jump-if-< = $factorial:end/disp8
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< span id = "L34" class = "LineNr" > 34 < / span > < span class = "subxComment" > # n > 1; return n * factorial(n-1)< / span >
< span id = "L35" class = "LineNr" > 35 < / span > 8b/-> *(ebp+8) 1/r32/ecx
< span id = "L36" class = "LineNr" > 36 < / span > 49/decrement-ecx
< span id = "L37" class = "LineNr" > 37 < / span > (< a href = 'factorial3.subx.html#L24' > factorial< / a > %ecx) < span class = "subxComment" > # => eax< / span >
< span id = "L38" class = "LineNr" > 38 < / span > f7 4/subop/multiply-into-eax *(ebp+8)
< span id = "L39" class = "LineNr" > 39 < / span > < span class = "subxComment" > # TODO: check for overflow< / span >
< span id = "L40" class = "LineNr" > 40 < / span > < span class = "Constant" > $factorial:end< / span > :
< span id = "L41" class = "LineNr" > 41 < / span > < span class = "subxComment" > # restore registers< / span >
< span id = "L42" class = "LineNr" > 42 < / span > 59/pop-to-ecx
< 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 = "subxTest" > test-factorial< / span > :
< span id = "L49" class = "LineNr" > 49 < / span > (< a href = 'factorial3.subx.html#L24' > factorial< / a > 5)
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< span id = "L50" class = "LineNr" > 50 < / span > (< a href = '102test.subx.html#L23' > check-ints-equal< / a > %eax 0x78 < span class = "Constant" > " F - test-factorial" < / span > )
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< span id = "L51" class = "LineNr" > 51 < / span > c3/return
< span id = "L52" class = "LineNr" > 52 < / span >
< span id = "L53" class = "LineNr" > 53 < / span > < span class = "SpecialChar" > Entry< / span > : < span class = "subxComment" > # run tests if necessary, compute `factorial(5)` if not< / span >
< span id = "L54" class = "LineNr" > 54 < / span > < span class = "subxS1Comment" > # . prologue< / span >
< span id = "L55" class = "LineNr" > 55 < / span > 89/< - %ebp 4/r32/esp
< span id = "L56" class = "LineNr" > 56 < / span >
< span id = "L57" class = "LineNr" > 57 < / span > < span class = "subxComment" > # initialize heap (needed by tests elsewhere)< / span >
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< span id = "L58" class = "LineNr" > 58 < / span > (< a href = '104new-segment.subx.html#L40' > new-segment< / a > *< span class = "SpecialChar" > < a href = '120allocate.subx.html#L34' > Heap-size< / a > < / span > < span class = "SpecialChar" > < a href = '120allocate.subx.html#L27' > Heap< / a > < / span > )
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< span id = "L59" class = "LineNr" > 59 < / span >
< span id = "L60" class = "LineNr" > 60 < / span > < span class = "subxComment" > # if (argc < = 1) return factorial(5)< / span >
< span id = "L61" class = "LineNr" > 61 < / span > 81 7/subop/compare *ebp 1/imm32
< span id = "L62" class = "LineNr" > 62 < / span > 7f/jump-if-> $main:run-tests/disp8
< span id = "L63" class = "LineNr" > 63 < / span > (< a href = 'factorial3.subx.html#L24' > factorial< / a > 5) < span class = "subxComment" > # => eax< / span >
< span id = "L64" class = "LineNr" > 64 < / span > 89/< - %ebx 0/r32/eax
< span id = "L65" class = "LineNr" > 65 < / span > eb/jump $main:end/disp8
< span id = "L66" class = "LineNr" > 66 < / span > < span class = "Constant" > $main:run-tests< / span > :
< span id = "L67" class = "LineNr" > 67 < / span > < span class = "subxComment" > # otherwise if first arg is " test" , then return run_tests()< / span >
< span id = "L68" class = "LineNr" > 68 < / span > < span class = "subxComment" > # if (!kernel-string-equal?(argv[1], " test" )) goto do-nothing< / span >
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< span id = "L69" class = "LineNr" > 69 < / span > (< a href = '103kernel-string-equal.subx.html#L31' > kernel-string-equal?< / a > *(ebp+8) < span class = "Constant" > " test" < / span > ) < span class = "subxComment" > # => eax< / span >
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< span id = "L70" class = "LineNr" > 70 < / span > 3d/compare-eax-and 0/imm32/false
< span id = "L71" class = "LineNr" > 71 < / span > 74/jump-if-= $main:do-nothing/disp8
< span id = "L72" class = "LineNr" > 72 < / span > < span class = "subxComment" > #< / span >
< span id = "L73" class = "LineNr" > 73 < / span > (run-tests)
< span id = "L74" class = "LineNr" > 74 < / span > < span class = "subxComment" > # exit(*Num-test-failures)< / span >
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< span id = "L75" class = "LineNr" > 75 < / span > 8b/-> *< span class = "SpecialChar" > < a href = '102test.subx.html#L89' > Num-test-failures< / a > < / span > 3/r32/ebx
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< span id = "L76" class = "LineNr" > 76 < / span > eb/jump $main:end/disp8
< span id = "L77" class = "LineNr" > 77 < / span > < span class = "Constant" > $main:do-nothing< / span > :
< span id = "L78" class = "LineNr" > 78 < / span > bb/copy-to-ebx 0/imm32
< span id = "L79" class = "LineNr" > 79 < / span > < span class = "Constant" > $main:end< / span > :
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< span id = "L80" class = "LineNr" > 80 < / span > e8/call < a href = '000init.subx.html#L18' > syscall_exit< / a > /disp32
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