https://github.com/mozilla/gecko-dev
Tip revision: 2184b6756754ce9727f02b314ff13701993a5ac6 authored by ffxbld on 17 March 2017, 05:39:03 UTC
Added FENNEC_52_0_1_RELEASE FENNEC_52_0_1_BUILD1 tag(s) for changeset c2473a54d5d4. DONTBUILD CLOSED TREE a=release
Added FENNEC_52_0_1_RELEASE FENNEC_52_0_1_BUILD1 tag(s) for changeset c2473a54d5d4. DONTBUILD CLOSED TREE a=release
Tip revision: 2184b67
jscntxt.cpp
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
* vim: set ts=8 sts=4 et sw=4 tw=99:
* 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/. */
/*
* JS execution context.
*/
#include "jscntxtinlines.h"
#include "mozilla/ArrayUtils.h"
#include "mozilla/DebugOnly.h"
#include "mozilla/MemoryReporting.h"
#include "mozilla/Sprintf.h"
#include <ctype.h>
#include <stdarg.h>
#include <string.h>
#ifdef ANDROID
# include <android/log.h>
# include <fstream>
# include <string>
#endif // ANDROID
#include "jsatom.h"
#include "jscompartment.h"
#include "jsexn.h"
#include "jsfun.h"
#include "jsgc.h"
#include "jsiter.h"
#include "jsobj.h"
#include "jsopcode.h"
#include "jsprf.h"
#include "jspubtd.h"
#include "jsscript.h"
#include "jsstr.h"
#include "jstypes.h"
#include "jswatchpoint.h"
#include "gc/Marking.h"
#include "jit/Ion.h"
#include "js/CharacterEncoding.h"
#include "vm/HelperThreads.h"
#include "vm/Shape.h"
#include "jsobjinlines.h"
#include "jsscriptinlines.h"
#include "vm/Stack-inl.h"
using namespace js;
using namespace js::gc;
using mozilla::DebugOnly;
using mozilla::PodArrayZero;
using mozilla::PointerRangeSize;
bool
js::AutoCycleDetector::init()
{
AutoCycleDetector::Set& set = cx->cycleDetectorSet;
hashsetAddPointer = set.lookupForAdd(obj);
if (!hashsetAddPointer) {
if (!set.add(hashsetAddPointer, obj)) {
ReportOutOfMemory(cx);
return false;
}
cyclic = false;
hashsetGenerationAtInit = set.generation();
}
return true;
}
js::AutoCycleDetector::~AutoCycleDetector()
{
if (!cyclic) {
if (hashsetGenerationAtInit == cx->cycleDetectorSet.generation())
cx->cycleDetectorSet.remove(hashsetAddPointer);
else
cx->cycleDetectorSet.remove(obj);
}
}
void
js::TraceCycleDetectionSet(JSTracer* trc, AutoCycleDetector::Set& set)
{
for (AutoCycleDetector::Set::Enum e(set); !e.empty(); e.popFront())
TraceRoot(trc, &e.mutableFront(), "cycle detector table entry");
}
bool
JSContext::init(uint32_t maxBytes, uint32_t maxNurseryBytes)
{
if (!JSRuntime::init(maxBytes, maxNurseryBytes))
return false;
if (!caches.init())
return false;
return true;
}
JSContext*
js::NewContext(uint32_t maxBytes, uint32_t maxNurseryBytes, JSRuntime* parentRuntime)
{
JSContext* cx = js_new<JSContext>(parentRuntime);
if (!cx)
return nullptr;
if (!cx->init(maxBytes, maxNurseryBytes)) {
js_delete(cx);
return nullptr;
}
return cx;
}
void
js::DestroyContext(JSContext* cx)
{
JS_AbortIfWrongThread(cx);
if (cx->outstandingRequests != 0)
MOZ_CRASH("Attempted to destroy a context while it is in a request.");
cx->roots.checkNoGCRooters();
/*
* Dump remaining type inference results while we still have a context.
* This printing depends on atoms still existing.
*/
for (CompartmentsIter c(cx, SkipAtoms); !c.done(); c.next())
PrintTypes(cx, c, false);
js_delete_poison(cx);
}
void
RootLists::checkNoGCRooters() {
#ifdef DEBUG
for (auto const& stackRootPtr : stackRoots_)
MOZ_ASSERT(stackRootPtr == nullptr);
#endif
}
bool
AutoResolving::alreadyStartedSlow() const
{
MOZ_ASSERT(link);
AutoResolving* cursor = link;
do {
MOZ_ASSERT(this != cursor);
if (object.get() == cursor->object && id.get() == cursor->id && kind == cursor->kind)
return true;
} while (!!(cursor = cursor->link));
return false;
}
static void
ReportError(JSContext* cx, JSErrorReport* reportp, JSErrorCallback callback,
void* userRef)
{
/*
* Check the error report, and set a JavaScript-catchable exception
* if the error is defined to have an associated exception. If an
* exception is thrown, then the JSREPORT_EXCEPTION flag will be set
* on the error report, and exception-aware hosts should ignore it.
*/
MOZ_ASSERT(reportp);
if ((!callback || callback == GetErrorMessage) &&
reportp->errorNumber == JSMSG_UNCAUGHT_EXCEPTION)
{
reportp->flags |= JSREPORT_EXCEPTION;
}
if (JSREPORT_IS_WARNING(reportp->flags)) {
CallWarningReporter(cx, reportp);
return;
}
ErrorToException(cx, reportp, callback, userRef);
}
/*
* The given JSErrorReport object have been zeroed and must not outlive
* cx->fp() (otherwise owned fields may become invalid).
*/
static void
PopulateReportBlame(JSContext* cx, JSErrorReport* report)
{
JSCompartment* compartment = cx->compartment();
if (!compartment)
return;
/*
* Walk stack until we find a frame that is associated with a non-builtin
* rather than a builtin frame and which we're allowed to know about.
*/
NonBuiltinFrameIter iter(cx, compartment->principals());
if (iter.done())
return;
report->filename = iter.filename();
report->lineno = iter.computeLine(&report->column);
// XXX: Make the column 1-based as in other browsers, instead of 0-based
// which is how SpiderMonkey stores it internally. This will be
// unnecessary once bug 1144340 is fixed.
report->column++;
report->isMuted = iter.mutedErrors();
}
/*
* Since memory has been exhausted, avoid the normal error-handling path which
* allocates an error object, report and callstack. If code is running, simply
* throw the static atom "out of memory". If code is not running, call the
* error reporter directly.
*
* Furthermore, callers of ReportOutOfMemory (viz., malloc) assume a GC does
* not occur, so GC must be avoided or suppressed.
*/
void
js::ReportOutOfMemory(ExclusiveContext* cxArg)
{
#ifdef JS_MORE_DETERMINISTIC
/*
* OOMs are non-deterministic, especially across different execution modes
* (e.g. interpreter vs JIT). In more-deterministic builds, print to stderr
* so that the fuzzers can detect this.
*/
fprintf(stderr, "ReportOutOfMemory called\n");
#endif
if (!cxArg->isJSContext())
return cxArg->addPendingOutOfMemory();
JSContext* cx = cxArg->asJSContext();
cx->runtime()->hadOutOfMemory = true;
AutoSuppressGC suppressGC(cx);
/* Report the oom. */
if (JS::OutOfMemoryCallback oomCallback = cx->runtime()->oomCallback)
oomCallback(cx, cx->runtime()->oomCallbackData);
cx->setPendingException(StringValue(cx->names().outOfMemory));
}
void
js::ReportOverRecursed(JSContext* maybecx, unsigned errorNumber)
{
#ifdef JS_MORE_DETERMINISTIC
/*
* We cannot make stack depth deterministic across different
* implementations (e.g. JIT vs. interpreter will differ in
* their maximum stack depth).
* However, we can detect externally when we hit the maximum
* stack depth which is useful for external testing programs
* like fuzzers.
*/
fprintf(stderr, "ReportOverRecursed called\n");
#endif
if (maybecx) {
JS_ReportErrorNumberASCII(maybecx, GetErrorMessage, nullptr, errorNumber);
maybecx->overRecursed_ = true;
}
}
JS_FRIEND_API(void)
js::ReportOverRecursed(JSContext* maybecx)
{
ReportOverRecursed(maybecx, JSMSG_OVER_RECURSED);
}
void
js::ReportOverRecursed(ExclusiveContext* cx)
{
if (cx->isJSContext())
ReportOverRecursed(cx->asJSContext());
else
cx->addPendingOverRecursed();
}
void
js::ReportAllocationOverflow(ExclusiveContext* cxArg)
{
if (!cxArg)
return;
if (!cxArg->isJSContext())
return;
JSContext* cx = cxArg->asJSContext();
AutoSuppressGC suppressGC(cx);
JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr, JSMSG_ALLOC_OVERFLOW);
}
/*
* Given flags and the state of cx, decide whether we should report an
* error, a warning, or just continue execution normally. Return
* true if we should continue normally, without reporting anything;
* otherwise, adjust *flags as appropriate and return false.
*/
static bool
checkReportFlags(JSContext* cx, unsigned* flags)
{
if (JSREPORT_IS_STRICT(*flags)) {
/* Warning/error only when JSOPTION_STRICT is set. */
if (!cx->compartment()->behaviors().extraWarnings(cx))
return true;
}
/* Warnings become errors when JSOPTION_WERROR is set. */
if (JSREPORT_IS_WARNING(*flags) && cx->options().werror())
*flags &= ~JSREPORT_WARNING;
return false;
}
bool
js::ReportErrorVA(JSContext* cx, unsigned flags, const char* format,
ErrorArgumentsType argumentsType, va_list ap)
{
JSErrorReport report;
if (checkReportFlags(cx, &flags))
return true;
UniqueChars message(JS_vsmprintf(format, ap));
if (!message) {
ReportOutOfMemory(cx);
return false;
}
MOZ_ASSERT_IF(argumentsType == ArgumentsAreASCII, JS::StringIsASCII(message.get()));
report.flags = flags;
report.errorNumber = JSMSG_USER_DEFINED_ERROR;
if (argumentsType == ArgumentsAreASCII || argumentsType == ArgumentsAreUTF8) {
report.initOwnedMessage(message.release());
} else {
MOZ_ASSERT(argumentsType == ArgumentsAreLatin1);
Latin1Chars latin1(message.get(), strlen(message.get()));
UTF8CharsZ utf8(JS::CharsToNewUTF8CharsZ(cx, latin1));
if (!utf8)
return false;
report.initOwnedMessage(reinterpret_cast<const char*>(utf8.get()));
}
PopulateReportBlame(cx, &report);
bool warning = JSREPORT_IS_WARNING(report.flags);
ReportError(cx, &report, nullptr, nullptr);
return warning;
}
/* |callee| requires a usage string provided by JS_DefineFunctionsWithHelp. */
void
js::ReportUsageErrorASCII(JSContext* cx, HandleObject callee, const char* msg)
{
const char* usageStr = "usage";
PropertyName* usageAtom = Atomize(cx, usageStr, strlen(usageStr))->asPropertyName();
RootedId id(cx, NameToId(usageAtom));
DebugOnly<Shape*> shape = static_cast<Shape*>(callee->as<JSFunction>().lookup(cx, id));
MOZ_ASSERT(!shape->configurable());
MOZ_ASSERT(!shape->writable());
MOZ_ASSERT(shape->hasDefaultGetter());
RootedValue usage(cx);
if (!JS_GetProperty(cx, callee, "usage", &usage))
return;
if (!usage.isString()) {
JS_ReportErrorASCII(cx, "%s", msg);
} else {
RootedString usageStr(cx, usage.toString());
JSAutoByteString str;
if (!str.encodeUtf8(cx, usageStr))
return;
JS_ReportErrorUTF8(cx, "%s. Usage: %s", msg, str.ptr());
}
}
bool
js::PrintError(JSContext* cx, FILE* file, JS::ConstUTF8CharsZ toStringResult,
JSErrorReport* report, bool reportWarnings)
{
MOZ_ASSERT(report);
/* Conditionally ignore reported warnings. */
if (JSREPORT_IS_WARNING(report->flags) && !reportWarnings)
return false;
char* prefix = nullptr;
if (report->filename)
prefix = JS_smprintf("%s:", report->filename);
if (report->lineno) {
char* tmp = prefix;
prefix = JS_smprintf("%s%u:%u ", tmp ? tmp : "", report->lineno, report->column);
JS_free(cx, tmp);
}
if (JSREPORT_IS_WARNING(report->flags)) {
char* tmp = prefix;
prefix = JS_smprintf("%s%swarning: ",
tmp ? tmp : "",
JSREPORT_IS_STRICT(report->flags) ? "strict " : "");
JS_free(cx, tmp);
}
const char* message = toStringResult ? toStringResult.c_str() : report->message().c_str();
/* embedded newlines -- argh! */
const char* ctmp;
while ((ctmp = strchr(message, '\n')) != 0) {
ctmp++;
if (prefix)
fputs(prefix, file);
fwrite(message, 1, ctmp - message, file);
message = ctmp;
}
/* If there were no filename or lineno, the prefix might be empty */
if (prefix)
fputs(prefix, file);
fputs(message, file);
if (const char16_t* linebuf = report->linebuf()) {
size_t n = report->linebufLength();
fputs(":\n", file);
if (prefix)
fputs(prefix, file);
for (size_t i = 0; i < n; i++)
fputc(static_cast<char>(linebuf[i]), file);
// linebuf usually ends with a newline. If not, add one here.
if (n == 0 || linebuf[n-1] != '\n')
fputc('\n', file);
if (prefix)
fputs(prefix, file);
n = report->tokenOffset();
for (size_t i = 0, j = 0; i < n; i++) {
if (linebuf[i] == '\t') {
for (size_t k = (j + 8) & ~7; j < k; j++)
fputc('.', file);
continue;
}
fputc('.', file);
j++;
}
fputc('^', file);
}
fputc('\n', file);
fflush(file);
JS_free(cx, prefix);
return true;
}
class MOZ_RAII AutoMessageArgs
{
size_t totalLength_;
/* only {0} thru {9} supported */
mozilla::Array<const char*, JS::MaxNumErrorArguments> args_;
mozilla::Array<size_t, JS::MaxNumErrorArguments> lengths_;
uint16_t count_;
bool allocatedElements_ : 1;
public:
AutoMessageArgs()
: totalLength_(0), count_(0), allocatedElements_(false)
{
PodArrayZero(args_);
}
~AutoMessageArgs()
{
/* free the arguments only if we allocated them */
if (allocatedElements_) {
uint16_t i = 0;
while (i < count_) {
if (args_[i])
js_free((void*)args_[i]);
i++;
}
}
}
const char* args(size_t i) const {
MOZ_ASSERT(i < count_);
return args_[i];
}
size_t totalLength() const {
return totalLength_;
}
size_t lengths(size_t i) const {
MOZ_ASSERT(i < count_);
return lengths_[i];
}
uint16_t count() const {
return count_;
}
/* Gather the arguments into an array, and accumulate their sizes. */
bool init(ExclusiveContext* cx, const char16_t** argsArg, uint16_t countArg,
ErrorArgumentsType typeArg, va_list ap) {
MOZ_ASSERT(countArg > 0);
count_ = countArg;
for (uint16_t i = 0; i < count_; i++) {
switch (typeArg) {
case ArgumentsAreASCII:
case ArgumentsAreUTF8: {
MOZ_ASSERT(!argsArg);
args_[i] = va_arg(ap, char*);
MOZ_ASSERT_IF(typeArg == ArgumentsAreASCII, JS::StringIsASCII(args_[i]));
lengths_[i] = strlen(args_[i]);
break;
}
case ArgumentsAreLatin1: {
MOZ_ASSERT(!argsArg);
const Latin1Char* latin1 = va_arg(ap, Latin1Char*);
size_t len = strlen(reinterpret_cast<const char*>(latin1));
mozilla::Range<const Latin1Char> range(latin1, len);
char* utf8 = JS::CharsToNewUTF8CharsZ(cx, range).c_str();
if (!utf8)
return false;
args_[i] = utf8;
lengths_[i] = strlen(utf8);
allocatedElements_ = true;
break;
}
case ArgumentsAreUnicode: {
const char16_t* uc = argsArg ? argsArg[i] : va_arg(ap, char16_t*);
size_t len = js_strlen(uc);
mozilla::Range<const char16_t> range(uc, len);
char* utf8 = JS::CharsToNewUTF8CharsZ(cx, range).c_str();
if (!utf8)
return false;
args_[i] = utf8;
lengths_[i] = strlen(utf8);
allocatedElements_ = true;
break;
}
}
totalLength_ += lengths_[i];
}
return true;
}
};
/*
* The arguments from ap need to be packaged up into an array and stored
* into the report struct.
*
* The format string addressed by the error number may contain operands
* identified by the format {N}, where N is a decimal digit. Each of these
* is to be replaced by the Nth argument from the va_list. The complete
* message is placed into reportp->message_.
*
* Returns true if the expansion succeeds (can fail if out of memory).
*/
bool
js::ExpandErrorArgumentsVA(ExclusiveContext* cx, JSErrorCallback callback,
void* userRef, const unsigned errorNumber,
const char16_t** messageArgs,
ErrorArgumentsType argumentsType,
JSErrorReport* reportp, va_list ap)
{
const JSErrorFormatString* efs;
if (!callback)
callback = GetErrorMessage;
{
AutoSuppressGC suppressGC(cx);
efs = callback(userRef, errorNumber);
}
if (efs) {
reportp->exnType = efs->exnType;
MOZ_ASSERT_IF(argumentsType == ArgumentsAreASCII, JS::StringIsASCII(efs->format));
uint16_t argCount = efs->argCount;
MOZ_RELEASE_ASSERT(argCount <= JS::MaxNumErrorArguments);
if (argCount > 0) {
/*
* Parse the error format, substituting the argument X
* for {X} in the format.
*/
if (efs->format) {
const char* fmt;
char* out;
#ifdef DEBUG
int expandedArgs = 0;
#endif
size_t expandedLength;
size_t len = strlen(efs->format);
AutoMessageArgs args;
if (!args.init(cx, messageArgs, argCount, argumentsType, ap))
return false;
expandedLength = len
- (3 * args.count()) /* exclude the {n} */
+ args.totalLength();
/*
* Note - the above calculation assumes that each argument
* is used once and only once in the expansion !!!
*/
char* utf8 = out = cx->pod_malloc<char>(expandedLength + 1);
if (!out)
return false;
fmt = efs->format;
while (*fmt) {
if (*fmt == '{') {
if (isdigit(fmt[1])) {
int d = JS7_UNDEC(fmt[1]);
MOZ_RELEASE_ASSERT(d < args.count());
strncpy(out, args.args(d), args.lengths(d));
out += args.lengths(d);
fmt += 3;
#ifdef DEBUG
expandedArgs++;
#endif
continue;
}
}
*out++ = *fmt++;
}
MOZ_ASSERT(expandedArgs == args.count());
*out = 0;
reportp->initOwnedMessage(utf8);
}
} else {
/* Non-null messageArgs should have at least one non-null arg. */
MOZ_ASSERT(!messageArgs);
/*
* Zero arguments: the format string (if it exists) is the
* entire message.
*/
if (efs->format)
reportp->initBorrowedMessage(efs->format);
}
}
if (!reportp->message()) {
/* where's the right place for this ??? */
const char* defaultErrorMessage
= "No error message available for error number %d";
size_t nbytes = strlen(defaultErrorMessage) + 16;
char* message = cx->pod_malloc<char>(nbytes);
if (!message)
return false;
snprintf(message, nbytes, defaultErrorMessage, errorNumber);
reportp->initOwnedMessage(message);
}
return true;
}
bool
js::ReportErrorNumberVA(JSContext* cx, unsigned flags, JSErrorCallback callback,
void* userRef, const unsigned errorNumber,
ErrorArgumentsType argumentsType, va_list ap)
{
JSErrorReport report;
bool warning;
if (checkReportFlags(cx, &flags))
return true;
warning = JSREPORT_IS_WARNING(flags);
report.flags = flags;
report.errorNumber = errorNumber;
PopulateReportBlame(cx, &report);
if (!ExpandErrorArgumentsVA(cx, callback, userRef, errorNumber,
nullptr, argumentsType, &report, ap)) {
return false;
}
ReportError(cx, &report, callback, userRef);
return warning;
}
static bool
ExpandErrorArguments(ExclusiveContext* cx, JSErrorCallback callback,
void* userRef, const unsigned errorNumber,
const char16_t** messageArgs,
ErrorArgumentsType argumentsType,
JSErrorReport* reportp, ...)
{
va_list ap;
va_start(ap, reportp);
bool expanded = js::ExpandErrorArgumentsVA(cx, callback, userRef, errorNumber,
messageArgs, argumentsType, reportp, ap);
va_end(ap);
return expanded;
}
bool
js::ReportErrorNumberUCArray(JSContext* cx, unsigned flags, JSErrorCallback callback,
void* userRef, const unsigned errorNumber,
const char16_t** args)
{
if (checkReportFlags(cx, &flags))
return true;
bool warning = JSREPORT_IS_WARNING(flags);
JSErrorReport report;
report.flags = flags;
report.errorNumber = errorNumber;
PopulateReportBlame(cx, &report);
if (!ExpandErrorArguments(cx, callback, userRef, errorNumber,
args, ArgumentsAreUnicode, &report))
{
return false;
}
ReportError(cx, &report, callback, userRef);
return warning;
}
void
js::CallWarningReporter(JSContext* cx, JSErrorReport* reportp)
{
MOZ_ASSERT(reportp);
MOZ_ASSERT(JSREPORT_IS_WARNING(reportp->flags));
if (JS::WarningReporter warningReporter = cx->runtime()->warningReporter)
warningReporter(cx, reportp);
}
bool
js::ReportIsNotDefined(JSContext* cx, HandleId id)
{
JSAutoByteString printable;
if (ValueToPrintable(cx, IdToValue(id), &printable)) {
JS_ReportErrorNumberLatin1(cx, GetErrorMessage, nullptr, JSMSG_NOT_DEFINED,
printable.ptr());
}
return false;
}
bool
js::ReportIsNotDefined(JSContext* cx, HandlePropertyName name)
{
RootedId id(cx, NameToId(name));
return ReportIsNotDefined(cx, id);
}
bool
js::ReportIsNullOrUndefined(JSContext* cx, int spindex, HandleValue v,
HandleString fallback)
{
bool ok;
UniqueChars bytes = DecompileValueGenerator(cx, spindex, v, fallback);
if (!bytes)
return false;
if (strcmp(bytes.get(), js_undefined_str) == 0 ||
strcmp(bytes.get(), js_null_str) == 0) {
ok = JS_ReportErrorFlagsAndNumberLatin1(cx, JSREPORT_ERROR,
GetErrorMessage, nullptr,
JSMSG_NO_PROPERTIES,
bytes.get());
} else if (v.isUndefined()) {
ok = JS_ReportErrorFlagsAndNumberLatin1(cx, JSREPORT_ERROR,
GetErrorMessage, nullptr,
JSMSG_UNEXPECTED_TYPE,
bytes.get(), js_undefined_str);
} else {
MOZ_ASSERT(v.isNull());
ok = JS_ReportErrorFlagsAndNumberLatin1(cx, JSREPORT_ERROR,
GetErrorMessage, nullptr,
JSMSG_UNEXPECTED_TYPE,
bytes.get(), js_null_str);
}
return ok;
}
void
js::ReportMissingArg(JSContext* cx, HandleValue v, unsigned arg)
{
char argbuf[11];
UniqueChars bytes;
SprintfLiteral(argbuf, "%u", arg);
if (IsFunctionObject(v)) {
RootedAtom name(cx, v.toObject().as<JSFunction>().name());
bytes = DecompileValueGenerator(cx, JSDVG_SEARCH_STACK, v, name);
if (!bytes)
return;
}
JS_ReportErrorNumberLatin1(cx, GetErrorMessage, nullptr,
JSMSG_MISSING_FUN_ARG,
argbuf, bytes ? bytes.get() : "");
}
bool
js::ReportValueErrorFlags(JSContext* cx, unsigned flags, const unsigned errorNumber,
int spindex, HandleValue v, HandleString fallback,
const char* arg1, const char* arg2)
{
UniqueChars bytes;
bool ok;
MOZ_ASSERT(js_ErrorFormatString[errorNumber].argCount >= 1);
MOZ_ASSERT(js_ErrorFormatString[errorNumber].argCount <= 3);
bytes = DecompileValueGenerator(cx, spindex, v, fallback);
if (!bytes)
return false;
ok = JS_ReportErrorFlagsAndNumberLatin1(cx, flags, GetErrorMessage, nullptr, errorNumber,
bytes.get(), arg1, arg2);
return ok;
}
const JSErrorFormatString js_ErrorFormatString[JSErr_Limit] = {
#define MSG_DEF(name, count, exception, format) \
{ #name, format, count, exception } ,
#include "js.msg"
#undef MSG_DEF
};
JS_FRIEND_API(const JSErrorFormatString*)
js::GetErrorMessage(void* userRef, const unsigned errorNumber)
{
if (errorNumber > 0 && errorNumber < JSErr_Limit)
return &js_ErrorFormatString[errorNumber];
return nullptr;
}
ExclusiveContext::ExclusiveContext(JSRuntime* rt, PerThreadData* pt, ContextKind kind,
const JS::ContextOptions& options)
: ContextFriendFields(kind == Context_JS),
runtime_(rt),
helperThread_(nullptr),
contextKind_(kind),
options_(options),
perThreadData(pt),
arenas_(nullptr),
enterCompartmentDepth_(0)
{
}
void
ExclusiveContext::recoverFromOutOfMemory()
{
if (JSContext* maybecx = maybeJSContext()) {
if (maybecx->isExceptionPending()) {
MOZ_ASSERT(maybecx->isThrowingOutOfMemory());
maybecx->clearPendingException();
}
return;
}
// Keep in sync with addPendingOutOfMemory.
if (ParseTask* task = helperThread()->parseTask())
task->outOfMemory = false;
}
JSContext::JSContext(JSRuntime* parentRuntime)
: ExclusiveContext(this, &this->JSRuntime::mainThread, Context_JS, JS::ContextOptions()),
JSRuntime(parentRuntime),
throwing(false),
unwrappedException_(this),
overRecursed_(false),
propagatingForcedReturn_(false),
liveVolatileJitFrameIterators_(nullptr),
reportGranularity(JS_DEFAULT_JITREPORT_GRANULARITY),
resolvingList(nullptr),
generatingError(false),
data(nullptr),
outstandingRequests(0),
jitIsBroken(false),
asyncStackForNewActivations(this),
asyncCauseForNewActivations(nullptr),
asyncCallIsExplicit(false)
{
MOZ_ASSERT(static_cast<ContextFriendFields*>(this) ==
ContextFriendFields::get(this));
}
JSContext::~JSContext()
{
destroyRuntime();
/* Free the stuff hanging off of cx. */
MOZ_ASSERT(!resolvingList);
}
bool
JSContext::getPendingException(MutableHandleValue rval)
{
MOZ_ASSERT(throwing);
rval.set(unwrappedException_);
if (IsAtomsCompartment(compartment()))
return true;
bool wasOverRecursed = overRecursed_;
clearPendingException();
if (!compartment()->wrap(this, rval))
return false;
assertSameCompartment(this, rval);
setPendingException(rval);
overRecursed_ = wasOverRecursed;
return true;
}
bool
JSContext::isThrowingOutOfMemory()
{
return throwing && unwrappedException_ == StringValue(names().outOfMemory);
}
bool
JSContext::isClosingGenerator()
{
return throwing && unwrappedException_.isMagic(JS_GENERATOR_CLOSING);
}
bool
JSContext::isThrowingDebuggeeWouldRun()
{
return throwing &&
unwrappedException_.isObject() &&
unwrappedException_.toObject().is<ErrorObject>() &&
unwrappedException_.toObject().as<ErrorObject>().type() == JSEXN_DEBUGGEEWOULDRUN;
}
bool
JSContext::currentlyRunning() const
{
return !!activation();
}
static bool
ComputeIsJITBroken()
{
#if !defined(ANDROID)
return false;
#else // ANDROID
if (getenv("JS_IGNORE_JIT_BROKENNESS")) {
return false;
}
std::string line;
// Check for the known-bad kernel version (2.6.29).
std::ifstream osrelease("/proc/sys/kernel/osrelease");
std::getline(osrelease, line);
__android_log_print(ANDROID_LOG_INFO, "Gecko", "Detected osrelease `%s'",
line.c_str());
if (line.npos == line.find("2.6.29")) {
// We're using something other than 2.6.29, so the JITs should work.
__android_log_print(ANDROID_LOG_INFO, "Gecko", "JITs are not broken");
return false;
}
// We're using 2.6.29, and this causes trouble with the JITs on i9000.
line = "";
bool broken = false;
std::ifstream cpuinfo("/proc/cpuinfo");
do {
if (0 == line.find("Hardware")) {
static const char* const blacklist[] = {
"SCH-I400", // Samsung Continuum
"SGH-T959", // Samsung i9000, Vibrant device
"SGH-I897", // Samsung i9000, Captivate device
"SCH-I500", // Samsung i9000, Fascinate device
"SPH-D700", // Samsung i9000, Epic device
"GT-I9000", // Samsung i9000, UK/Europe device
nullptr
};
for (const char* const* hw = &blacklist[0]; *hw; ++hw) {
if (line.npos != line.find(*hw)) {
__android_log_print(ANDROID_LOG_INFO, "Gecko",
"Blacklisted device `%s'", *hw);
broken = true;
break;
}
}
break;
}
std::getline(cpuinfo, line);
} while(!cpuinfo.fail() && !cpuinfo.eof());
__android_log_print(ANDROID_LOG_INFO, "Gecko", "JITs are %sbroken",
broken ? "" : "not ");
return broken;
#endif // ifndef ANDROID
}
static bool
IsJITBrokenHere()
{
static bool computedIsBroken = false;
static bool isBroken = false;
if (!computedIsBroken) {
isBroken = ComputeIsJITBroken();
computedIsBroken = true;
}
return isBroken;
}
void
JSContext::updateJITEnabled()
{
jitIsBroken = IsJITBrokenHere();
}
size_t
JSContext::sizeOfExcludingThis(mozilla::MallocSizeOf mallocSizeOf) const
{
/*
* There are other JSContext members that could be measured; the following
* ones have been found by DMD to be worth measuring. More stuff may be
* added later.
*/
return cycleDetectorSet.sizeOfExcludingThis(mallocSizeOf);
}
void
JSContext::mark(JSTracer* trc)
{
if (cycleDetectorSet.initialized())
TraceCycleDetectionSet(trc, cycleDetectorSet);
if (compartment_)
compartment_->mark();
}
void*
ExclusiveContext::stackLimitAddressForJitCode(StackKind kind)
{
#ifdef JS_SIMULATOR
return runtime_->addressOfSimulatorStackLimit();
#else
return stackLimitAddress(kind);
#endif
}
uintptr_t
ExclusiveContext::stackLimitForJitCode(StackKind kind)
{
#ifdef JS_SIMULATOR
return runtime_->simulator()->stackLimit();
#else
return stackLimit(kind);
#endif
}
void
JSContext::resetJitStackLimit()
{
// Note that, for now, we use the untrusted limit for ion. This is fine,
// because it's the most conservative limit, and if we hit it, we'll bail
// out of ion into the interpreter, which will do a proper recursion check.
#ifdef JS_SIMULATOR
jitStackLimit_ = jit::Simulator::StackLimit();
#else
jitStackLimit_ = nativeStackLimit[StackForUntrustedScript];
#endif
jitStackLimitNoInterrupt_ = jitStackLimit_;
}
void
JSContext::initJitStackLimit()
{
resetJitStackLimit();
}
JSVersion
JSContext::findVersion() const
{
if (JSScript* script = currentScript(nullptr, ALLOW_CROSS_COMPARTMENT))
return script->getVersion();
if (compartment() && compartment()->behaviors().version() != JSVERSION_UNKNOWN)
return compartment()->behaviors().version();
return defaultVersion();
}
#ifdef DEBUG
JS::AutoCheckRequestDepth::AutoCheckRequestDepth(JSContext* cx)
: cx(cx)
{
MOZ_ASSERT(cx->runtime()->requestDepth || cx->runtime()->isHeapBusy());
MOZ_ASSERT(CurrentThreadCanAccessRuntime(cx->runtime()));
cx->runtime()->checkRequestDepth++;
}
JS::AutoCheckRequestDepth::AutoCheckRequestDepth(ContextFriendFields* cxArg)
: cx(static_cast<ExclusiveContext*>(cxArg)->maybeJSContext())
{
if (cx) {
MOZ_ASSERT(cx->runtime()->requestDepth || cx->runtime()->isHeapBusy());
MOZ_ASSERT(CurrentThreadCanAccessRuntime(cx->runtime()));
cx->runtime()->checkRequestDepth++;
}
}
JS::AutoCheckRequestDepth::~AutoCheckRequestDepth()
{
if (cx) {
MOZ_ASSERT(cx->runtime()->checkRequestDepth != 0);
cx->runtime()->checkRequestDepth--;
}
}
#endif
#ifdef JS_CRASH_DIAGNOSTICS
void
CompartmentChecker::check(InterpreterFrame* fp)
{
if (fp)
check(fp->environmentChain());
}
void
CompartmentChecker::check(AbstractFramePtr frame)
{
if (frame)
check(frame.environmentChain());
}
#endif
void
AutoEnterOOMUnsafeRegion::crash(const char* reason)
{
char msgbuf[1024];
SprintfLiteral(msgbuf, "[unhandlable oom] %s", reason);
MOZ_ReportAssertionFailure(msgbuf, __FILE__, __LINE__);
MOZ_CRASH();
}
AutoEnterOOMUnsafeRegion::AnnotateOOMAllocationSizeCallback
AutoEnterOOMUnsafeRegion::annotateOOMSizeCallback = nullptr;
void
AutoEnterOOMUnsafeRegion::crash(size_t size, const char* reason)
{
{
JS::AutoSuppressGCAnalysis suppress;
if (annotateOOMSizeCallback)
annotateOOMSizeCallback(size);
}
crash(reason);
}