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enhanced the compiler to implement short-circuited logical 'and' and 'or' special forms.

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renamed the primitive function 'and' to '_and' and 'or' to '_or'
This commit is contained in:
hyung-hwan 2018-03-03 17:16:41 +00:00
parent c387772803
commit 71d024837d
3 changed files with 218 additions and 6 deletions
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2
README.md
View File

@ -7,6 +7,7 @@ A HCL program is composed of 0 or more expressions.
## Special Form Expression
* and
* break
* defun
* do
@ -14,6 +15,7 @@ A HCL program is composed of 0 or more expressions.
* else
* if
* lambda
* or
* return
* set
* until

214
lib/comp.c
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@ -638,6 +638,12 @@ enum
COP_EMIT_RETURN,
COP_EMIT_SET,
COP_SUBCOMPILE_AND_EXPR,
COP_SUBCOMPILE_OR_EXPR,
COP_POST_AND_EXPR,
COP_POST_OR_EXPR,
COP_POST_IF_COND,
COP_POST_IF_BODY,
@ -652,15 +658,69 @@ enum
/* ========================================================================= */
static int compile_and (hcl_t* hcl, hcl_oop_t src)
{
hcl_seterrbfmt (hcl, HCL_ENOIMPL, "and not implemented");
hcl_oop_t expr, obj;
HCL_ASSERT (hcl, HCL_IS_CONS(hcl, src));
HCL_ASSERT (hcl, HCL_CONS_CAR(src) == hcl->_and);
obj = HCL_CONS_CDR(src);
if (HCL_IS_NIL(hcl, obj))
{
/* no value */
hcl_setsynerrbfmt (hcl, HCL_SYNERR_ARGCOUNT, HCL_NULL, HCL_NULL,
"no expression specified in and - %O", src); /* TODO: error location */
return -1;
}
else if (!HCL_IS_CONS(hcl, obj))
{
hcl_setsynerrbfmt (hcl, HCL_SYNERR_DOTBANNED, HCL_NULL, HCL_NULL,
"redundant cdr in and - %O", src); /* TODO: error location */
return -1;
}
/* TODO: optimization - eat away all truee expressions */
expr = HCL_CONS_CAR(obj);
obj = HCL_CONS_CDR(obj);
SWITCH_TOP_CFRAME (hcl, COP_COMPILE_OBJECT, expr); /* 1 */
PUSH_SUBCFRAME (hcl, COP_SUBCOMPILE_AND_EXPR, obj); /* 2 */
return 0;
}
static int compile_or (hcl_t* hcl, hcl_oop_t src)
{
hcl_seterrbfmt (hcl, HCL_ENOIMPL, "or not implemented");
hcl_oop_t expr, obj;
HCL_ASSERT (hcl, HCL_IS_CONS(hcl, src));
HCL_ASSERT (hcl, HCL_CONS_CAR(src) == hcl->_or);
obj = HCL_CONS_CDR(src);
if (HCL_IS_NIL(hcl, obj))
{
/* no value */
hcl_setsynerrbfmt (hcl, HCL_SYNERR_ARGCOUNT, HCL_NULL, HCL_NULL,
"no expression specified in or - %O", src); /* TODO: error location */
return -1;
}
else if (!HCL_IS_CONS(hcl, obj))
{
hcl_setsynerrbfmt (hcl, HCL_SYNERR_DOTBANNED, HCL_NULL, HCL_NULL,
"redundant cdr in or - %O", src); /* TODO: error location */
return -1;
}
/* TODO: optimization - eat away all false expressions */
expr = HCL_CONS_CAR(obj);
obj = HCL_CONS_CDR(obj);
SWITCH_TOP_CFRAME (hcl, COP_COMPILE_OBJECT, expr); /* 1 */
PUSH_SUBCFRAME (hcl, COP_SUBCOMPILE_OR_EXPR, obj); /* 2 */
return 0;
}
static int compile_break (hcl_t* hcl, hcl_oop_t src)
{
@ -1978,6 +2038,140 @@ static HCL_INLINE int subcompile_else (hcl_t* hcl)
/* ========================================================================= */
static HCL_INLINE int subcompile_and_expr (hcl_t* hcl)
{
hcl_oop_t obj, expr;
hcl_cframe_t* cf;
hcl_ooi_t jump_inst_pos;
cf = GET_TOP_CFRAME(hcl);
HCL_ASSERT (hcl, cf->opcode == COP_SUBCOMPILE_AND_EXPR);
obj = cf->operand;
/* TODO: optimization - eat away all true expressions */
if (HCL_IS_NIL(hcl, obj))
{
/* no more */
POP_CFRAME (hcl);
return 0;
}
else if (!HCL_IS_CONS(hcl, obj))
{
hcl_setsynerrbfmt (hcl, HCL_SYNERR_DOTBANNED, HCL_NULL, HCL_NULL,
"redundant cdr in and - %O", obj); /* TODO: error location */
return -1;
}
HCL_ASSERT (hcl, hcl->code.bc.len < HCL_SMOOI_MAX);
jump_inst_pos = hcl->code.bc.len;
if (emit_single_param_instruction(hcl, HCL_CODE_JUMP_FORWARD_IF_FALSE, MAX_CODE_JUMP) <= -1) return -1;
if (emit_byte_instruction(hcl, HCL_CODE_POP_STACKTOP) <= -1) return -1;
expr = HCL_CONS_CAR(obj);
obj = HCL_CONS_CDR(obj);
SWITCH_TOP_CFRAME (hcl, COP_COMPILE_OBJECT, expr); /* 1 */
PUSH_SUBCFRAME (hcl, COP_POST_AND_EXPR, obj); /* 3 */
cf = GET_SUBCFRAME(hcl);
cf->operand = HCL_SMOOI_TO_OOP(jump_inst_pos);
PUSH_SUBCFRAME (hcl, COP_SUBCOMPILE_AND_EXPR, obj); /* 2 */
return 0;
}
static HCL_INLINE int post_and_expr (hcl_t* hcl)
{
hcl_cframe_t* cf;
hcl_ooi_t jip;
hcl_oow_t jump_offset;
cf = GET_TOP_CFRAME(hcl);
HCL_ASSERT (hcl, cf->opcode == COP_POST_AND_EXPR);
HCL_ASSERT (hcl, hcl->code.bc.len < HCL_SMOOI_MAX);
jip = HCL_OOP_TO_SMOOI(cf->operand);
/* patch the jump insruction emitted after each expression inside the 'and' expression */
jump_offset = hcl->code.bc.len - jip - (HCL_BCODE_LONG_PARAM_SIZE + 1);
patch_long_jump (hcl, jip, jump_offset);
POP_CFRAME(hcl);
return 0;
}
/* ========================================================================= */
static HCL_INLINE int subcompile_or_expr (hcl_t* hcl)
{
hcl_oop_t obj, expr;
hcl_cframe_t* cf;
hcl_ooi_t jump_inst_pos;
cf = GET_TOP_CFRAME(hcl);
HCL_ASSERT (hcl, cf->opcode == COP_SUBCOMPILE_OR_EXPR);
obj = cf->operand;
/* TODO: optimization - eat away all false expressions */
if (HCL_IS_NIL(hcl, obj))
{
/* no more */
POP_CFRAME (hcl);
return 0;
}
else if (!HCL_IS_CONS(hcl, obj))
{
hcl_setsynerrbfmt (hcl, HCL_SYNERR_DOTBANNED, HCL_NULL, HCL_NULL,
"redundant cdr in or - %O", obj); /* TODO: error location */
return -1;
}
HCL_ASSERT (hcl, hcl->code.bc.len < HCL_SMOOI_MAX);
jump_inst_pos = hcl->code.bc.len;
if (emit_single_param_instruction(hcl, HCL_CODE_JUMP_FORWARD_IF_TRUE, MAX_CODE_JUMP) <= -1) return -1;
if (emit_byte_instruction(hcl, HCL_CODE_POP_STACKTOP) <= -1) return -1;
expr = HCL_CONS_CAR(obj);
obj = HCL_CONS_CDR(obj);
SWITCH_TOP_CFRAME (hcl, COP_COMPILE_OBJECT, expr); /* 1 */
PUSH_SUBCFRAME (hcl, COP_POST_OR_EXPR, obj); /* 3 */
cf = GET_SUBCFRAME(hcl);
cf->operand = HCL_SMOOI_TO_OOP(jump_inst_pos);
PUSH_SUBCFRAME (hcl, COP_SUBCOMPILE_OR_EXPR, obj); /* 2 */
return 0;
}
static HCL_INLINE int post_or_expr (hcl_t* hcl)
{
hcl_cframe_t* cf;
hcl_ooi_t jip;
hcl_oow_t jump_offset;
cf = GET_TOP_CFRAME(hcl);
HCL_ASSERT (hcl, cf->opcode == COP_POST_OR_EXPR);
HCL_ASSERT (hcl, hcl->code.bc.len < HCL_SMOOI_MAX);
jip = HCL_OOP_TO_SMOOI(cf->operand);
/* patch the jump insruction emitted after each expression inside the 'and' expression */
jump_offset = hcl->code.bc.len - jip - (HCL_BCODE_LONG_PARAM_SIZE + 1);
patch_long_jump (hcl, jip, jump_offset);
POP_CFRAME(hcl);
return 0;
}
/* ========================================================================= */
static HCL_INLINE int post_if_cond (hcl_t* hcl)
{
hcl_cframe_t* cf;
@ -2467,6 +2661,22 @@ int hcl_compile (hcl_t* hcl, hcl_oop_t obj)
if (emit_set(hcl) <= -1) goto oops;
break;
case COP_SUBCOMPILE_AND_EXPR:
if (subcompile_and_expr(hcl) <= -1) goto oops;
break;
case COP_SUBCOMPILE_OR_EXPR:
if (subcompile_or_expr(hcl) <= -1) goto oops;
break;
case COP_POST_AND_EXPR:
if (post_and_expr(hcl) <= -1) goto oops;
break;
case COP_POST_OR_EXPR:
if (post_or_expr(hcl) <= -1) goto oops;
break;
case COP_POST_IF_COND:
if (post_if_cond(hcl) <= -1) goto oops;
break;

4
lib/prim.c
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@ -417,8 +417,8 @@ static pf_t builtin_prims[] =
{ 0, 0, pf_gc, 2, { 'g','c' } },
{ 1, 1, pf_not, 3, { 'n','o','t' } },
{ 2, HCL_TYPE_MAX(hcl_oow_t), pf_and, 3, { 'a','n','d' } },
{ 2, HCL_TYPE_MAX(hcl_oow_t), pf_or, 2, { 'o','r' } },
{ 2, HCL_TYPE_MAX(hcl_oow_t), pf_and, 4, { '_','a','n','d' } },
{ 2, HCL_TYPE_MAX(hcl_oow_t), pf_or, 3, { '_','o','r' } },
{ 2, 2, pf_eqv, 4, { 'e','q','v','?' } },
{ 2, 2, pf_eql, 4, { 'e','q','l','?' } },