5485 - promote SubX to top-level

1 files changed, 0 insertions, 117 deletions

diff --git a/subx/apps/factorial.subx b/subx/apps/factorial.subx
deleted file mode 100644
index e4b7a057..00000000
--- a/subx/apps/factorial.subx
+++ /dev/null
@@ -1,117 +0,0 @@
-## compute the factorial of 5, and return the result in the exit code
-#
-# To run (from the subx directory):
-#   $ ./subx translate apps/factorial.subx -o apps/factorial
-#   $ ./subx run apps/factorial
-# Expected result:
-#   $ echo $?
-#   120
-#
-# You can also run the automated test suite:
-#   $ ./subx 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
-
-Entry:  # run tests if necessary, compute `factorial(5)` if not
-    # initialize heap
-    # . Heap = new-segment(64KB)
-    # . . push args
-    68/push  Heap/imm32
-    68/push  0x10000/imm32/64KB
-    # . . call
-    e8/call  new-segment/disp32
-    # . . discard args
-    81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               8/imm32           # add to ESP
-
-    # . prolog
-    89/copy                         3/mod/direct    5/rm32/EBP    .           .             .           4/r32/ESP   .               .                 # copy ESP to EBP
-    # - if argc > 1 and argv[1] == "test", then return run_tests()
-    # . argc > 1
-    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
-    # . 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
-    # . check result
-    3d/compare-EAX-and  1/imm32
-    75/jump-if-not-equal  $run-main/disp8
-    # . run-tests()
-    e8/call  run-tests/disp32
-    8b/copy                         0/mod/indirect  5/rm32/.disp32            .             .           0/r32/EAX   Num-test-failures/disp32          # copy *Num-test-failures to EAX
-    eb/jump  $main:end/disp8  # where EAX will get copied to EBX
-$run-main:
-    # - otherwise return 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
-$main:end:
-    # syscall(exit, EAX)
-    89/copy                         3/mod/direct    3/rm32/EBX    .           .             .           0/r32/EAX   .               .                 # copy EAX to EBX
-    b8/copy-to-EAX  1/imm32/exit
-    cd/syscall  0x80/imm8
-
-factorial:  # n : int -> int/EAX
-    # . prolog
-    55/push-EBP
-    89/copy                         3/mod/direct    5/rm32/EBP    .           .             .           4/r32/ESP   .               .                 # copy ESP to EBP
-    53/push-EBX
-    # EAX = 1 (base case)
-    b8/copy-to-EAX  1/imm32
-    # if (n <= 1) return
-    81          7/subop/compare     1/mod/*+disp8   5/rm32/EBP    .           .             .           .           8/disp8         1/imm32           # compare *(EBP+8)
-    7e/jump-if-<=  $factorial:end/disp8
-    # EBX = n-1
-    8b/copy                         1/mod/*+disp8   5/rm32/EBP    .           .                         3/r32/EBX   8/disp8         .                 # copy *(EBP+8) to EBX
-    81          5/subop/subtract    3/mod/direct    3/rm32/EBX    .           .             .           .           .               1/imm32           # subtract from EBX
-    # EAX = factorial(n-1)
-    # . . push args
-    53/push-EBX
-    # . . call
-    e8/call  factorial/disp32
-    # . . discard args
-    81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               4/imm32           # add to ESP
-    # return n * factorial(n-1)
-    f7          4/subop/multiply    1/mod/*+disp8   5/rm32/EBP    .           .                                     8/disp8         .                 # multiply *(EBP+8) into EAX
-    # TODO: check for overflow
-$factorial:end:
-    # . epilog
-    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