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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* vim: set ts=8 sts=2 et sw=2 tw=80:
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "js/Value.h"
#include "mozilla/Assertions.h"
#include <inttypes.h>
#include "gc/Cell.h" // js::gc::Cell
#include "js/Conversions.h" // JS::NumberToString, JS::MaximumNumberToStringLength
#include "js/Printer.h" // js::GenericPrinter, js::Fprinter
#include "vm/BigIntType.h" // JS::BigInt
#include "vm/JSObject.h" // JSObject
#include "vm/JSONPrinter.h" // js::JSONPrinter
#include "vm/StringType.h" // JSString
#include "vm/SymbolType.h" // JS::Symbol
static const JS::Value JSVAL_NULL =
JS::Value::fromTagAndPayload(JSVAL_TAG_NULL, 0);
static const JS::Value JSVAL_FALSE =
JS::Value::fromTagAndPayload(JSVAL_TAG_BOOLEAN, false);
static const JS::Value JSVAL_TRUE =
JS::Value::fromTagAndPayload(JSVAL_TAG_BOOLEAN, true);
static const JS::Value JSVAL_VOID =
JS::Value::fromTagAndPayload(JSVAL_TAG_UNDEFINED, 0);
static const mozilla::Maybe<JS::Value> JSVAL_NOTHING;
namespace JS {
const HandleValue NullHandleValue =
HandleValue::fromMarkedLocation(&JSVAL_NULL);
const HandleValue UndefinedHandleValue =
HandleValue::fromMarkedLocation(&JSVAL_VOID);
const HandleValue TrueHandleValue =
HandleValue::fromMarkedLocation(&JSVAL_TRUE);
const HandleValue FalseHandleValue =
HandleValue::fromMarkedLocation(&JSVAL_FALSE);
const Handle<mozilla::Maybe<Value>> NothingHandleValue =
Handle<mozilla::Maybe<Value>>::fromMarkedLocation(&JSVAL_NOTHING);
#ifdef DEBUG
void JS::Value::assertTraceKindMatches(js::gc::Cell* cell) const {
MOZ_ASSERT(traceKind() == cell->getTraceKind());
}
#endif
} // namespace JS
void js::ReportBadValueTypeAndCrash(const JS::Value& value) {
MOZ_CRASH_UNSAFE_PRINTF("JS::Value has illegal type: 0x%" PRIx64,
value.asRawBits());
}
#if defined(DEBUG) || defined(JS_JITSPEW)
void JS::Value::dump() const {
js::Fprinter out(stderr);
dump(out);
}
void JS::Value::dump(js::GenericPrinter& out) const {
js::JSONPrinter json(out);
dump(json);
out.put("\n");
}
void JS::Value::dump(js::JSONPrinter& json) const {
json.beginObject();
dumpFields(json);
json.endObject();
}
template <typename KnownF, typename UnknownF>
void WhyMagicToString(JSWhyMagic why, KnownF known, UnknownF unknown) {
switch (why) {
case JS_ELEMENTS_HOLE:
known("JS_ELEMENTS_HOLE");
break;
case JS_NO_ITER_VALUE:
known("JS_NO_ITER_VALUE");
break;
case JS_GENERATOR_CLOSING:
known("JS_GENERATOR_CLOSING");
break;
case JS_ARG_POISON:
known("JS_ARG_POISON");
break;
case JS_SERIALIZE_NO_NODE:
known("JS_SERIALIZE_NO_NODE");
break;
case JS_IS_CONSTRUCTING:
known("JS_IS_CONSTRUCTING");
break;
case JS_HASH_KEY_EMPTY:
known("JS_HASH_KEY_EMPTY");
break;
case JS_ION_ERROR:
known("JS_ION_ERROR");
break;
case JS_ION_BAILOUT:
known("JS_ION_BAILOUT");
break;
case JS_OPTIMIZED_OUT:
known("JS_OPTIMIZED_OUT");
break;
case JS_UNINITIALIZED_LEXICAL:
known("JS_UNINITIALIZED_LEXICAL");
break;
case JS_MISSING_ARGUMENTS:
known("JS_MISSING_ARGUMENTS");
break;
case JS_GENERIC_MAGIC:
known("JS_GENERIC_MAGIC");
break;
case JS_ERROR_WITHOUT_CAUSE:
known("JS_ERROR_WITHOUT_CAUSE");
break;
default:
unknown(int(why));
break;
}
}
void JS::Value::dumpFields(js::JSONPrinter& json) const {
if (isDouble()) {
json.property("type", "double");
double d = toDouble();
if (mozilla::IsNegativeZero(d)) {
// Negative zero needs special handling.
json.property("value", "-0");
} else {
// Infinity, -Infinity, NaN are handled by JS::NumberToString.
char buf[JS::MaximumNumberToStringLength];
JS::NumberToString(d, buf);
json.property("value", buf);
}
json.formatProperty("private", "0x%p", toPrivateUnchecked());
} else {
auto tag = toTag();
switch (tag) {
case JSVAL_TAG_INT32:
json.property("type", "int32");
json.property("value", toInt32());
break;
case JSVAL_TAG_UNDEFINED:
json.property("type", "undefined");
break;
case JSVAL_TAG_NULL:
json.property("type", "null");
break;
case JSVAL_TAG_BOOLEAN:
json.property("type", "boolean");
json.boolProperty("value", toBoolean());
break;
case JSVAL_TAG_MAGIC:
json.property("type", "magic");
WhyMagicToString(
whyMagic(), [&](const char* name) { json.property("value", name); },
[&](int value) {
json.formatProperty("value", "Unknown(%d)", value);
});
break;
case JSVAL_TAG_STRING:
json.property("type", "string");
toString()->dumpFields(json);
break;
case JSVAL_TAG_SYMBOL:
json.property("type", "symbol");
toSymbol()->dumpFields(json);
break;
case JSVAL_TAG_PRIVATE_GCTHING:
json.property("type", "private GCThing");
json.formatProperty("address", "0x%p", toGCThing());
break;
case JSVAL_TAG_BIGINT:
json.property("type", "bigint");
toBigInt()->dumpFields(json);
break;
# ifdef ENABLE_RECORD_TUPLE
case JSVAL_TAG_EXTENDED_PRIMITIVE: {
json.property("type", "extended primitive");
JSObject* obj = &toExtendedPrimitive();
json.property("class", obj->getClass()->name);
json.formatProperty("address", "(JSObject*)0x%p", obj);
break;
}
# endif
case JSVAL_TAG_OBJECT:
json.property("type", "object");
toObject().dumpFields(json);
break;
default:
json.formatProperty("type", "unknown tag(%08x)", tag);
break;
}
}
}
void JS::Value::dumpStringContent(js::GenericPrinter& out) const {
if (isDouble()) {
double d = toDouble();
if (mozilla::IsNegativeZero(d)) {
// Negative zero needs special handling.
out.put("-0");
} else {
// Infinity, -Infinity, NaN are handled by JS::NumberToString.
char buf[JS::MaximumNumberToStringLength];
JS::NumberToString(d, buf);
out.put(buf);
}
out.printf(" / <private @ 0x%p>", toPrivateUnchecked());
} else {
auto tag = toTag();
switch (tag) {
case JSVAL_TAG_INT32:
out.printf("%d", toInt32());
break;
case JSVAL_TAG_UNDEFINED:
out.put("undefined");
break;
case JSVAL_TAG_NULL:
out.put("null");
break;
case JSVAL_TAG_BOOLEAN:
if (toBoolean()) {
out.put("true");
} else {
out.put("false");
}
break;
case JSVAL_TAG_MAGIC:
out.put("<magic ");
WhyMagicToString(
whyMagic(), [&](const char* name) { out.put(name); },
[&](int value) { out.printf("Unknown(%d)", value); });
out.put(">");
break;
case JSVAL_TAG_STRING:
toString()->dumpStringContent(out);
break;
case JSVAL_TAG_SYMBOL:
toSymbol()->dumpStringContent(out);
break;
case JSVAL_TAG_PRIVATE_GCTHING:
out.printf("<private GCThing @ 0x%p>", toGCThing());
break;
case JSVAL_TAG_BIGINT:
toBigInt()->dumpStringContent(out);
break;
# ifdef ENABLE_RECORD_TUPLE
case JSVAL_TAG_EXTENDED_PRIMITIVE:
toExtendedPrimitive().dumpStringContent(out);
break;
# endif
case JSVAL_TAG_OBJECT:
toObject().dumpStringContent(out);
break;
default:
out.printf("Unknown(%08x)", tag);
break;
}
}
}
#endif
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