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itialize heap # . Heap = new-segment(Heap-size) # . . push args 68/push Heap/imm32 68/push Heap-size/imm32 # . . call e8/call new-segment/disp32 # . . discard args 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp # - if argc > 1 and argv[1] == "test", then return run_tests() # if (argc <= 1) goto run-main 81 7/subop/compare 1/mod/*+disp8 5/rm32/ebp . . . . 0/disp8 1/imm32 # compare *ebp 7e/jump-if-lesser-or-equal $run-main/disp8 # if (!kernel-string-equal?(argv[1], "test")) goto run-main # . eax = kernel-string-equal?(argv[1], "test") # . . push args 68/push "test"/imm32 ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp . . . . 8/disp8 . # push *(ebp+8) # . . call e8/call kernel-string-equal?/disp32 # . . discard args 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp # . if (eax == 0) goto run-main 3d/compare-eax-and 0/imm32 74/jump-if-equal $run-main/disp8 # run-tests() e8/call run-tests/disp32 # syscall(exit, *Num-test-failures) 8b/copy 0/mod/indirect 5/rm32/.disp32 . . 3/r32/ebx Num-test-failures/disp32 # copy *Num-test-failures to ebx eb/jump $main:end/disp8 $run-main: # - otherwise return factorial(5) # eax = factorial(5) # . . push args 68/push 5/imm32 # . . call e8/call factorial/disp32 # . . discard args 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp # syscall(exit, eax) 89/copy 3/mod/direct 3/rm32/ebx . . . 0/r32/eax . . # copy eax to ebx $main:end: b8/copy-to-eax 1/imm32/exit cd/syscall 0x80/imm8 factorial: # n : int -> int/eax # . prologue 55/push-ebp 89/copy 3/mod/direct 5/rm32/ebp . . . 4/r32/esp . . # copy esp to ebp 53/push-ebx # if (n <= 1) return 1 b8/copy-to-eax 1/imm32 81 7/subop/compare 1/mod/*+disp8 5/rm32/ebp . . . . 8/disp8 1/imm32 # compare *(ebp+8) 7e/jump-if-<= $factorial:end/disp8 # ebx = n-1 8b/copy 1/mod/*+disp8 5/rm32/ebp . . 3/r32/ebx 8/disp8 . # copy *(ebp+8) to ebx 4b/decrement-ebx # eax = factorial(n-1) # . . push args 53/push-ebx # . . call e8/call factorial/disp32 # . . discard args 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp # return n * factorial(n-1) f7 4/subop/multiply 1/mod/*+disp8 5/rm32/ebp . . 8/disp8 . # multiply *(ebp+8) into eax # TODO: check for overflow $factorial:end: # . epilogue 5b/pop-to-ebx 89/copy 3/mod/direct 4/rm32/esp . . . 5/r32/ebp . . # copy ebp to esp 5d/pop-to-ebp c3/return test-factorial: # factorial(5) # . . push args 68/push 5/imm32 # . . call e8/call factorial/disp32 # . . discard args 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp # check-ints-equal(eax, 120, msg) # . . push args 68/push "F - test-factorial"/imm32 68/push 0x78/imm32/expected-120 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 # end c3/return # . . vim:nowrap:textwidth=0