diff options
Diffstat (limited to 'apps/factorial.subx')
| -rw-r--r-- | apps/factorial.subx | 153 |
1 files changed, 0 insertions, 153 deletions
diff --git a/apps/factorial.subx b/apps/factorial.subx deleted file mode 100644 index b4f8888b..00000000 --- a/apps/factorial.subx +++ /dev/null @@ -1,153 +0,0 @@ -## compute the factorial of 5, and print the result -# -# To run: -# $ ./bootstrap translate init.linux [01]*.subx apps/factorial.subx -o apps/factorial -# $ ./bootstrap run apps/factorial -# Expected result: -# $ echo $? -# 120 -# -# You can also run the automated test suite: -# $ ./bootstrap run apps/factorial test -# Expected output: -# ........ -# Every '.' indicates a passing test. Failing tests get a 'F'. - -== code -# instruction effective address register displacement immediate -# . op subop mod rm32 base index scale r32 -# . 1-3 bytes 3 bits 2 bits 3 bits 3 bits 3 bits 2 bits 2 bits 0/1/2/4 bytes 0/1/2/4 bytes - -factorial: # n: int -> _/eax: int - # . prologue - 55/push-ebp - 89/copy 3/mod/direct 5/rm32/ebp . . . 4/r32/esp . . # copy esp to ebp - 51/push-ecx - # 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-<= $factorial:end/disp8 - # var ecx: int = n-1 - 8b/copy 1/mod/*+disp8 5/rm32/ebp . . 1/r32/ecx 8/disp8 . # copy *(ebp+8) to ecx - 49/decrement-ecx - # var eax: int = factorial(n-1) - # . . push args - 51/push-ecx - # . . call - e8/call factorial/disp32 - # . . discard args - 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp - # return n * factorial(n-1) - f7 4/subop/multiply 1/mod/*+disp8 5/rm32/ebp . . 8/disp8 . # multiply *(ebp+8) into eax - # TODO: check for overflow -$factorial:end: - # restore registers - 59/pop-to-ecx - # . epilogue - 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 - -Entry: # run tests if necessary, compute `factorial(5)` if not - # . prologue - 89/copy 3/mod/direct 5/rm32/ebp . . . 4/r32/esp . . # copy esp to ebp - - # initialize heap (needed by tests elsewhere) - # . Heap = new-segment(Heap-size) - # . . push args - 68/push Heap/imm32 - ff 6/subop/push 0/mod/indirect 5/rm32/.disp32 . . . Heap-size/disp32 # push *Heap-size - # . . 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) return factorial(5) -$run-main: - 81 7/subop/compare 1/mod/*+disp8 5/rm32/ebp . . . . 0/disp8 1/imm32 # compare *ebp - 7f/jump-if-> $main:run-tests/disp8 - # 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 - # var buffer/ecx: (stream byte 10) # number of decimal digits a 32-bit number can have - 81 5/subop/subtract 3/mod/direct 4/rm32/esp . . . . . 0xa/imm32 # subtract from esp - 68/push 0xa/imm32/decimal-digits-in-32bit-number - 68/push 0/imm32/read - 68/push 0/imm32/write - 89/copy 3/mod/direct 1/rm32/ecx . . . 4/r32/esp . . # copy esp to ecx - # write-int32-decimal(buffer, eax) - # . . push args - 50/push-eax - 51/push-ecx - # . . call - e8/call write-int32-decimal/disp32 - # . . discard args - 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp - # write-stream(stderr, buffer) - # . . push args - 51/push-ecx - 68/push 2/imm32/stderr - # . . call - e8/call write-stream/disp32 - # . . discard args - 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp - # write(stderr, Newline) - # . . push args - 68/push Newline/imm32 - 68/push 2/imm32/stderr - # . . call - e8/call write/disp32 - # . . discard args - 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp - # - 89/copy 3/mod/direct 3/rm32/ebx . . . 0/r32/eax . . # copy eax to ebx - eb/jump $main:end/disp8 -$main:run-tests: - # otherwise if first arg is "test", then return run_tests() - # if (!kernel-string-equal?(argv[1], "test")) goto do-nothing - # . 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 == false) goto do-nothing - 3d/compare-eax-and 0/imm32/false - 74/jump-if-= $main:do-nothing/disp8 - # run-tests() - e8/call run-tests/disp32 - # 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 $main:end/disp8 -$main:do-nothing: - bb/copy-to-ebx 0/imm32 -$main:end: - e8/call syscall_exit/disp32 - -# . . vim:nowrap:textwidth=0 |