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#include "coerce.h"
/*
* Be aware that some value variants represents actual values (e.g.
* vt_int), and others represent a type (e.g. vt_scalar) which holds a
* type identifier token. Here we implicitly expect a vt_scalar type as
* first argument, but only receive the token. The second argument is a
* value literal. Our job is to decide if the value fits within the
* given type. Our internal representation already ensures that value
* fits within a 64bit signed or unsigned integer, or double; otherwise
* the parser would have set vt_invalid type on the value.
*
* If the value is invalid, success is returned because the
* error is presumably already generated. If the value is some other
* type than expect, an error is generated.
*
* Symbolic names are not allowed as values here.
*
* Converts positive integers to signed type and unsigned integers to
* signed type, integers to floats and floats to integers.
*
* Optionally allows 1 to be assigned as true and 0 as false, and vice
* versa when allow_boolean_conversion is enabled.
*
* Returns 0 on success, -1 on error.
*/
int fb_coerce_scalar_type(fb_parser_t *P, fb_symbol_t *sym, fb_scalar_type_t st, fb_value_t *value)
{
double d;
float f;
if (!value->type) {
return 0;
}
/*
* The parser only produces negative vt_int values, which simplifies
* the logic, but to make this operation robust against multiple
* coercion steps, we first convert back to uint if the assumption turns
* out false.
*/
if (value->type == vt_int && value->i >= 0) {
value->type = vt_uint;
value->u = (uint64_t)value->i;
}
if (value->type == vt_invalid) {
/* Silently ignore past errors. */
return 0;
}
if (value->type == vt_bool && st != fb_bool && P->opts.allow_boolean_conversion) {
value->type = vt_uint;
value->u = (uint64_t)value->b;
assert(value->u == 1 || value->u == 0);
}
switch (st) {
case fb_ulong:
if (value->type != vt_uint) {
error_sym(P, sym, "64-bit uint32_t type only accepts unsigned integers");
value->type = vt_invalid;
return -1;
}
return 0;
case fb_uint:
if (value->type != vt_uint) {
error_sym(P, sym, "32-bit unsigned int type only accepts unsigned integers");
value->type = vt_invalid;
return -1;
}
if (value->u > UINT32_MAX) {
error_sym(P, sym, "32-bit unsigned int overflow");
value->type = vt_invalid;
return -1;
}
return 0;
case fb_ushort:
if (value->type != vt_uint) {
error_sym(P, sym, "16-bit unsigned short type only accepts unsigned integers");
value->type = vt_invalid;
return -1;
}
if (value->u > UINT16_MAX) {
error_sym(P, sym, "16-bit unsigned short overflow");
value->type = vt_invalid;
return -1;
}
return 0;
case fb_char:
/* Although C treats char as signed by default, flatcc treats it as unsigned. */
case fb_ubyte:
if (value->type != vt_uint) {
error_sym(P, sym, "8-bit unsigned byte type only accepts unsigned integers");
value->type = vt_invalid;
return -1;
}
if (value->u > UINT8_MAX) {
error_sym(P, sym, "8-bit unsigned byte overflow");
value->type = vt_invalid;
return -1;
}
return 0;
case fb_long:
if (value->type == vt_int) {
/* Native format is always ok, or parser would have failed. */
return 0;
}
if (value->type == vt_uint) {
if (value->u >= (1ULL << 63)) {
error_sym(P, sym, "64-bit signed int32_t overflow");
value->type = vt_invalid;
return -1;
}
value->i = (int64_t)value->u;
value->type = vt_int;
return 0;
}
error_sym(P, sym, "64-bit int32_t type only accepts integers");
value->type = vt_invalid;
return -1;
case fb_int:
if (value->type == vt_int) {
if (value->i < INT32_MIN) {
error_sym(P, sym, "32-bit signed int underflow");
value->type = vt_invalid;
return -1;
}
return 0;
}
if (value->type == vt_uint) {
if (value->i > INT32_MAX) {
error_sym(P, sym, "32-bit signed int overflow");
value->type = vt_invalid;
return -1;
}
value->i = (int64_t)value->u;
value->type = vt_int;
return 0;
}
error_sym(P, sym, "32-bit signed int type only accepts integers");
value->type = vt_invalid;
return -1;
case fb_short:
if (value->type == vt_int) {
if (value->i < INT16_MIN) {
error_sym(P, sym, "16-bit signed short underflow");
value->type = vt_invalid;
return -1;
}
return 0;
}
if (value->type == vt_uint) {
if (value->i > INT16_MAX) {
error_sym(P, sym, "16-bit signed short overflow");
value->type = vt_invalid;
return -1;
}
value->i = (int64_t)value->u;
value->type = vt_int;
return 0;
}
error_sym(P, sym, "16-bit signed short type only accepts integers");
value->type = vt_invalid;
return -1;
case fb_byte:
if (value->type == vt_int) {
if (value->i < INT8_MIN) {
error_sym(P, sym, "8-bit signed byte underflow");
value->type = vt_invalid;
return -1;
}
return 0;
}
if (value->type == vt_uint) {
if (value->i > INT8_MAX) {
error_sym(P, sym, "8-bit signed byte overflow");
value->type = vt_invalid;
return -1;
}
value->i = (int64_t)value->u;
value->type = vt_int;
return 0;
}
error_sym(P, sym, "8-bit signed byte type only accepts integers");
value->type = vt_invalid;
return -1;
case fb_bool:
if (value->type == vt_uint && P->opts.allow_boolean_conversion) {
if (value->u > 1) {
error_sym(P, sym, "boolean integer conversion only accepts 0 (false) or 1 (true)");
value->type = vt_invalid;
return -1;
}
} else if (value->type != vt_bool) {
error_sym(P, sym, "boolean type only accepts 'true' or 'false' as values");
value->type = vt_invalid;
return -1;
}
return 0;
case fb_double:
switch (value->type) {
case vt_int:
d = (double)value->i;
if ((int64_t)d != value->i) {
/* We could make this a warning. */
error_sym(P, sym, "precision loss in 64-bit double type assignment");
value->type = vt_invalid;
return -1;
}
value->f = d;
value->type = vt_float;
return 0;
case vt_uint:
d = (double)value->u;
if ((uint64_t)d != value->u) {
/* We could make this a warning. */
error_sym(P, sym, "precision loss in 64-bit double type assignment");
value->type = vt_invalid;
return -1;
}
value->f = d;
value->type = vt_float;
return 0;
case vt_float:
/* Double is our internal repr., so not loss at this point. */
return 0;
default:
error_sym(P, sym, "64-bit double type only accepts integer and float values");
value->type = vt_invalid;
return -1;
}
case fb_float:
switch (value->type) {
case vt_int:
f = (float)value->i;
if ((int64_t)f != value->i) {
/* We could make this a warning. */
error_sym(P, sym, "precision loss in 32-bit float type assignment");
value->type = vt_invalid;
return -1;
}
value->f = f;
value->type = vt_float;
return 0;
case vt_uint:
f = (float)value->u;
if ((uint64_t)f != value->u) {
/* We could make this a warning. */
error_sym(P, sym, "precision loss in 32-bit float type assignment");
value->type = vt_invalid;
return -1;
}
value->f = f;
value->type = vt_float;
return 0;
case vt_float:
return 0;
default:
error_sym(P, sym, "32-bit float type only accepts integer and float values");
value->type = vt_invalid;
return -1;
}
default:
error_sym(P, sym, "scalar type expected");
value->type = vt_invalid;
return -1;
}
}
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