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added a few comments to lib/comp.c

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This commit is contained in:
hyunghwan.chung 2019-08-06 10:13:44 +00:00
parent 11b2629680
commit 569ee2424d
1 changed files with 9 additions and 2 deletions
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11
moo/lib/comp.c
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@ -6284,12 +6284,14 @@ static int compile_if_expression (moo_t* moo)
if (TOKEN_TYPE(moo) == MOO_IOTOK_IF) if (TOKEN_TYPE(moo) == MOO_IOTOK_IF)
{ {
/* if */
push_true_inst = BCODE_PUSH_TRUE; push_true_inst = BCODE_PUSH_TRUE;
push_false_inst = BCODE_PUSH_FALSE; push_false_inst = BCODE_PUSH_FALSE;
jmpop_inst = BCODE_JMPOP_FORWARD_IF_FALSE; jmpop_inst = BCODE_JMPOP_FORWARD_IF_FALSE;
} }
else else
{ {
/* ifnot */
push_true_inst = BCODE_PUSH_FALSE; push_true_inst = BCODE_PUSH_FALSE;
push_false_inst = BCODE_PUSH_TRUE; push_false_inst = BCODE_PUSH_TRUE;
jmpop_inst = BCODE_JMPOP_FORWARD_IF_TRUE; jmpop_inst = BCODE_JMPOP_FORWARD_IF_TRUE;
@ -6310,8 +6312,10 @@ static int compile_if_expression (moo_t* moo)
if (precondpos + 1 == postcondpos && cc->mth.code.ptr[precondpos] == push_true_inst) if (precondpos + 1 == postcondpos && cc->mth.code.ptr[precondpos] == push_true_inst)
{ {
/* got 'if (true)' or 'ifnot (false)' */
/* do not generate jump */ /* do not generate jump */
jumptonext = INVALID_IP; jumptonext = INVALID_IP; /* indicate that the jump has not been emitted */
falseblock = 0; falseblock = 0;
/* eliminate PUSH_TRUE as well */ /* eliminate PUSH_TRUE as well */
@ -6320,7 +6324,10 @@ static int compile_if_expression (moo_t* moo)
} }
else if (precondpos + 1 == postcondpos && cc->mth.code.ptr[precondpos] == push_false_inst) else if (precondpos + 1 == postcondpos && cc->mth.code.ptr[precondpos] == push_false_inst)
{ {
jumptonext = INVALID_IP; /* got 'if (false)' or 'ifnot (true)' */
jumptonext = INVALID_IP; /* indicate that the jump has not been emitted */
/* mark that the conditional is false. instructions will get eliminated below */ /* mark that the conditional is false. instructions will get eliminated below */
falseblock = 1; falseblock = 1;
} }