diff options
Diffstat (limited to 'subx/apps/subx-common.subx')
| -rw-r--r-- | subx/apps/subx-common.subx | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/subx/apps/subx-common.subx b/subx/apps/subx-common.subx index e8b3140c..129c9821 100644 --- a/subx/apps/subx-common.subx +++ b/subx/apps/subx-common.subx @@ -24,6 +24,7 @@ get-or-insert: # table : (address stream {string, _}), key : (address string), # curr += row-size # if table->write >= table->length # abort + # zero-out(max, row-size) # *max = key # table->write += row-size # return max+4 @@ -72,6 +73,14 @@ $get-or-insert:not-found: 8b/copy 0/mod/indirect 6/rm32/ESI . . . 1/r32/ECX . . # copy *ESI to ECX 3b/compare 1/mod/*+disp8 6/rm32/ESI . . . 1/r32/ECX 8/disp8 . # compare ECX with *(ESI+8) 73/jump-if-greater-or-equal-unsigned $get-or-insert:abort/disp8 + # zero-out(max, row-size) + # . . push args + ff 6/subop/push 1/mod/*+disp8 5/rm32/EBP . . . . 0x10/disp8 . # push *(EBP+16) + 52/push-EDX + # . . call + e8/call zero-out/disp32 + # . . discard args + 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP # *max = key # . EAX = key 8b/copy 1/mod/*+disp8 5/rm32/EBP . . . 0/r32/EAX 0xc/disp8 . # copy *(EBP+12) to EAX @@ -258,6 +267,7 @@ $test-get-or-insert:end: # scan 'table' for a row with a key 'key' and return the address of the corresponding value # if no row is found, save 'key' in the next available row # if there are no rows free, abort +# WARNING: leaks memory # TODO: pass in an allocation descriptor get-or-insert-slice: # table : (address stream {string, _}), key : (address slice), row-size : int -> EAX : (address _) # pseudocode: @@ -269,6 +279,7 @@ get-or-insert-slice: # table : (address stream {string, _}), key : (address sli # curr += row-size # if table->write >= table->length # abort + # zero-out(max, row-size) # *max = slice-to-string(Heap, key) # table->write += row-size # return max+4 @@ -317,6 +328,14 @@ $get-or-insert-slice:not-found: 8b/copy 0/mod/indirect 6/rm32/ESI . . . 1/r32/ECX . . # copy *ESI to ECX 3b/compare 1/mod/*+disp8 6/rm32/ESI . . . 1/r32/ECX 8/disp8 . # compare ECX with *(ESI+8) 7d/jump-if-greater-or-equal $get-or-insert-slice:abort/disp8 + # zero-out(max, row-size) + # . . push args + ff 6/subop/push 1/mod/*+disp8 5/rm32/EBP . . . . 0x10/disp8 . # push *(EBP+16) + 52/push-EDX + # . . call + e8/call zero-out/disp32 + # . . discard args + 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP # *max = slice-to-string(Heap, key) # . EAX = slice-to-string(Heap, key) # . . push args |