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[util] Implement more of cexpr

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This adds unary, vector and function expressions.
This commit is contained in:
Bill Currie 2021-01-04 00:11:52 +09:00
parent 81300f89f8
commit 4562e0b876
3 changed files with 194 additions and 20 deletions
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14
include/QF/cexpr.h
View file

@ -62,6 +62,11 @@ typedef struct exprval_s {
void *value;
} exprval_t;
typedef struct exprlist_s {
struct exprlist_s *next;
exprval_t *value;
} exprlist_t;
typedef struct exprsym_s {
const char *name;
exprtype_t *type;
@ -69,6 +74,14 @@ typedef struct exprsym_s {
struct exprsym_s *next;
} exprsym_t;
typedef struct exprfunc_s {
exprtype_t *result;
int num_params;
exprtype_t **param_types;
void (*func) (const exprval_t **params, exprval_t *result,
struct exprctx_s *context);
} exprfunc_t;
typedef struct exprtab_s {
exprsym_t *symbols;
struct hashtab_s *tab;
@ -116,6 +129,7 @@ extern exprtype_t cexpr_vector;
extern exprtype_t cexpr_quaternion;
extern exprtype_t cexpr_exprval;
extern exprtype_t cexpr_field;
extern exprtype_t cexpr_function;
extern binop_t cexpr_struct_binops[];

193
libs/util/cexpr-parse.y
View file

@ -43,6 +43,7 @@
#include <stdio.h>
#include "QF/cmem.h"
#include "QF/dstring.h"
#include "QF/hash.h"
#include "QF/qfplist.h"
#include "QF/sys.h"
@ -55,11 +56,17 @@ static exprval_t *binary_expr (int op, const exprval_t *a, const exprval_t *b,
exprctx_t *context);
static exprval_t *field_expr (const exprval_t *a, const exprval_t *b,
exprctx_t *context);
static exprval_t *unary_expr (int op, const exprval_t *val,
exprctx_t *context);
static exprval_t *vector_expr (exprlist_t *list, exprctx_t *context);
static exprval_t *function_expr (exprsym_t *fsym, exprlist_t *list,
exprctx_t *context);
static exprlist_t *expr_item (exprval_t *val, exprctx_t *context);
static void
yyerror (void *scanner, exprctx_t *context, const char *s)
{
cexpr_error (context, "%s before %s\n", s, cexpr_yyget_text (scanner));
cexpr_error (context, "%s before %s", s, cexpr_yyget_text (scanner));
}
%}
@ -78,19 +85,21 @@ yyerror (void *scanner, exprctx_t *context, const char *s)
%left SHL SHR
%left '+' '-'
%left '*' '/' '%' MOD
%right SIZEOF UNARY INCOP
%right <op> SIZEOF UNARY INCOP
%left HYPERUNARY
%left '.' '(' '['
%token <symbol> NAME
%token <value> VALUE
%type <value> expr field
%type <value> expr field uexpr
%type <list> opt_arg_list arg_list arg_expr
%union {
int op;
exprsym_t *symbol;
exprval_t *value;
exprlist_t *list;
const char *string;
}
@ -100,20 +109,8 @@ start
: expr { assign_expr (context->result, $1, context); }
;
expr
: expr SHL expr { $$ = binary_expr (SHL, $1, $3, context); }
| expr SHR expr { $$ = binary_expr (SHR, $1, $3, context); }
| expr '+' expr { $$ = binary_expr ('+', $1, $3, context); }
| expr '-' expr { $$ = binary_expr ('-', $1, $3, context); }
| expr '*' expr { $$ = binary_expr ('*', $1, $3, context); }
| expr '/' expr { $$ = binary_expr ('/', $1, $3, context); }
| expr '&' expr { $$ = binary_expr ('&', $1, $3, context); }
| expr '|' expr { $$ = binary_expr ('|', $1, $3, context); }
| expr '^' expr { $$ = binary_expr ('^', $1, $3, context); }
| expr '%' expr { $$ = binary_expr ('%', $1, $3, context); }
| expr '.' field { $$ = field_expr ($1, $3, context); }
| expr MOD expr { $$ = binary_expr (MOD, $1, $3, context); }
| NAME
uexpr
: NAME
{
if ($1) {
$$ = (exprval_t *) cmemalloc (context->memsuper, sizeof (*$$));
@ -125,6 +122,29 @@ expr
}
}
| VALUE
| '[' arg_list ']' { $$ = vector_expr ($2, context); }
| '(' expr ')' { $$ = $2; }
| NAME '(' opt_arg_list ')' { $$ = function_expr ($1, $3, context); }
| uexpr '.' field { $$ = field_expr ($1, $3, context); }
| '+' uexpr %prec UNARY { $$ = $2; }
| '-' uexpr %prec UNARY { $$ = unary_expr ('-', $2, context); }
| '!' uexpr %prec UNARY { $$ = unary_expr ('!', $2, context); }
| '~' uexpr %prec UNARY { $$ = unary_expr ('~', $2, context); }
;
expr
: uexpr
| expr SHL expr { $$ = binary_expr (SHL, $1, $3, context); }
| expr SHR expr { $$ = binary_expr (SHR, $1, $3, context); }
| expr '+' expr { $$ = binary_expr ('+', $1, $3, context); }
| expr '-' expr { $$ = binary_expr ('-', $1, $3, context); }
| expr '*' expr { $$ = binary_expr ('*', $1, $3, context); }
| expr '/' expr { $$ = binary_expr ('/', $1, $3, context); }
| expr '&' expr { $$ = binary_expr ('&', $1, $3, context); }
| expr '|' expr { $$ = binary_expr ('|', $1, $3, context); }
| expr '^' expr { $$ = binary_expr ('^', $1, $3, context); }
| expr '%' expr { $$ = binary_expr ('%', $1, $3, context); }
| expr MOD expr { $$ = binary_expr (MOD, $1, $3, context); }
;
field
@ -141,6 +161,23 @@ field
}
;
opt_arg_list
: { $$ = 0; }
| arg_list { $$ = $1; }
;
arg_list
: arg_expr
| arg_list ',' arg_expr
{
$3-> next = $1;
$$ = $3;
}
arg_expr
: expr { $$ = expr_item ($1, context); }
;
%%
static void
@ -156,7 +193,7 @@ assign_expr (exprval_t *dst, const exprval_t *src, exprctx_t *context)
} else {
if (dst->type != src->type) {
cexpr_error (context,
"type mismatch in expression result: %s = %s\n",
"type mismatch in expression result: %s = %s",
dst->type->name, src->type->name);
return;
}
@ -185,8 +222,9 @@ binary_expr (int op, const exprval_t *a, const exprval_t *b,
}
exprval_t *result = cexpr_value (rtype, context);
if (!binop->op) {
cexpr_error (context, "invalid binary expression: %s %c %s\n",
cexpr_error (context, "invalid binary expression: %s %c %s",
a->type->name, op, b->type->name);
memset (result->value, 0, rtype->size);
} else {
binop->func (a, b, result, context);
}
@ -205,11 +243,126 @@ field_expr (const exprval_t *a, const exprval_t *b, exprctx_t *context)
}
}
if (!binop->op) {
cexpr_error (context, "invalid binary expression: %s.%s\n",
cexpr_error (context, "invalid binary expression: %s.%s",
a->type->name, b->type->name);
result = cexpr_value (&cexpr_int, context);
*(int *) result->value = 0;
} else {
exprval_t c = { 0, &result };
binop->func (a, b, &c, context);
}
return result;
}
static exprval_t *
unary_expr (int op, const exprval_t *val, exprctx_t *context)
{
unop_t *unop;
for (unop = val->type->unops; unop->op; unop++) {
if (unop->op == op) {
break;
}
}
exprtype_t *rtype = unop->result;
if (!rtype) {
rtype = val->type;
}
exprval_t *result = cexpr_value (rtype, context);
if (!unop->op) {
cexpr_error (context, "invalid unary expression: %c %s",
op, val->type->name);
} else {
unop->func (val, result, context);
}
return result;
}
exprval_t *
vector_expr (exprlist_t *list, exprctx_t *context)
{
exprlist_t *l;
exprval_t *val = cexpr_value (&cexpr_vector, context);
int i;
for (i = 0; i < 4 && list; i++, list = l) {
exprval_t dst = { &cexpr_float, ((float *) val->value) + i };
exprval_t *src = list->value;
binop_t *cast = cexpr_find_cast (&cexpr_float, src->type);
if (cast) {
cast->func (&dst, src, &dst, context);
} else {
cexpr_error (context, "invalid vector expression type: [%d] %s",
i, val->type->name);
}
l = list->next;
cmemfree (context->memsuper, list);
}
for ( ; i < 4; i++) {
((float *) val->value)[i] = 0;
}
if (i == 4 && list) {
cexpr_error (context, "excess elements in vector expression");
}
return val;
}
static exprval_t *function_expr (exprsym_t *fsym, exprlist_t *list,
exprctx_t *context)
{
exprlist_t *l;
int num_args = 0;
exprfunc_t *func = 0;
exprval_t *result;
for (l = list; l; l = l->next) {
num_args++;
}
__auto_type args = (const exprval_t **) alloca (num_args * sizeof (exprval_t *));
__auto_type types = (exprtype_t **) alloca (num_args * sizeof (exprtype_t *));
for (num_args = 0; list; list = l, num_args++) {
args[num_args] = list->value;
types[num_args] = list->value->type;
l = list->next;
cmemfree (context->memsuper, list);
}
if (fsym->type != &cexpr_function) {
cexpr_error (context, "invalid function %s", fsym->name);
result = cexpr_value (&cexpr_int, context);
*(int *) result->value = 0;
return result;
}
for (exprfunc_t *f = fsym->value; f->result; f++) {
if (f->num_params == num_args
&& memcmp (f->param_types, types,
num_args * sizeof (exprtype_t *)) == 0) {
func = f;
break;
}
}
if (!func) {
dstring_t *argstr = dstring_newstr();
for (int i = 0; i < num_args; i++) {
dasprintf (argstr, "%s%s", types[i]->name,
i + 1 < num_args ? ", ": "");
}
cexpr_error (context, "no overload for %s(%s)", fsym->name,
argstr->str);
dstring_delete (argstr);
result = cexpr_value (&cexpr_int, context);
*(int *) result->value = 0;
return result;
}
result = cexpr_value (func->result, context);
func->func (args, result, context);
return result;
}
static exprlist_t *
expr_item (exprval_t *val, exprctx_t *context)
{
__auto_type item = (exprlist_t *) cmemalloc (context->memsuper,
sizeof (exprlist_t));
item->next = 0;
item->value = val;
return item;
}

7
libs/util/cexpr-type.c
View file

@ -483,6 +483,13 @@ exprtype_t cexpr_field = {
0,
};
exprtype_t cexpr_function = {
"function",
0, // has no size of its own
0, // can't actually do anything with a function other than call
0,
};
VISIBLE binop_t *
cexpr_find_cast (exprtype_t *dst_type, exprtype_t *src_type)
{