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gason: Allow tagged pointers.

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Unknown W. Brackets 2021-08-22 11:23:02 -07:00
parent 821a6a60aa
commit 8c08518617
1 changed files with 13 additions and 16 deletions
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29
ext/gason/gason.h
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@ -16,35 +16,32 @@ enum JsonTag {
struct JsonNode;
#define JSON_VALUE_PAYLOAD_MASK 0x00007FFFFFFFFFFFULL
#define JSON_VALUE_NAN_MASK 0x7FF8000000000000ULL
#define JSON_VALUE_TAG_MASK 0xF
#define JSON_VALUE_TAG_SHIFT 47
union JsonValue {
uint64_t ival;
double fval;
struct JsonValue {
union {
uint64_t ival_;
double fval_;
};
uint8_t tag_ = JSON_NULL;
JsonValue(double x)
: fval(x) {
: fval_(x), tag_(JSON_NUMBER) {
}
JsonValue(JsonTag tag = JSON_NULL, void *payload = nullptr) {
assert((uint64_t)payload <= JSON_VALUE_PAYLOAD_MASK);
ival = JSON_VALUE_NAN_MASK | ((uint64_t)tag << JSON_VALUE_TAG_SHIFT) | (uintptr_t)payload;
JsonValue(JsonTag tag = JSON_NULL, void *payload = nullptr)
: ival_((uintptr_t)payload), tag_(tag) {
}
bool isDouble() const {
return (int64_t)ival <= (int64_t)JSON_VALUE_NAN_MASK;
return tag_ == JSON_NUMBER;
}
JsonTag getTag() const {
return isDouble() ? JSON_NUMBER : JsonTag((ival >> JSON_VALUE_TAG_SHIFT) & JSON_VALUE_TAG_MASK);
return JsonTag(tag_);
}
uint64_t getPayload() const {
assert(!isDouble());
return ival & JSON_VALUE_PAYLOAD_MASK;
return ival_;
}
double toNumber() const {
assert(getTag() == JSON_NUMBER);
return fval;
return fval_;
}
char *toString() const {
assert(getTag() == JSON_STRING);