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Handled return-value of SetElement in some cases, or avoided it in other.

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SetElement can cause an exception to be thrown. If its return value
isn't checked, this exception might not be handled at the correct time.
In some cases, it's a matter of returning Exception::Failure() from
a runtime function.
In other cases, code using SetElement on a JSArray has been changed
to setting directly on a FixedArray and only creating the JSArray
at the end.

Review URL: http://codereview.chromium.org/6588130

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@7039 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
This commit is contained in:
lrn@chromium.org 2011-03-03 10:16:22 +00:00
parent e3c95a645f
commit 8fddb2a664
5 changed files with 78 additions and 49 deletions
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18
src/jsregexp.cc
View File

@ -97,9 +97,10 @@ static inline void ThrowRegExpException(Handle<JSRegExp> re,
Handle<String> pattern,
Handle<String> error_text,
const char* message) {
Handle<JSArray> array = Factory::NewJSArray(2);
SetElement(array, 0, pattern);
SetElement(array, 1, error_text);
Handle<FixedArray> elements = Factory::NewFixedArray(2);
elements->set(0, *pattern);
elements->set(1, *error_text);
Handle<JSArray> array = Factory::NewJSArrayWithElements(elements);
Handle<Object> regexp_err = Factory::NewSyntaxError(message, array);
Top::Throw(*regexp_err);
}
@ -325,11 +326,12 @@ bool RegExpImpl::CompileIrregexp(Handle<JSRegExp> re, bool is_ascii) {
is_ascii);
if (result.error_message != NULL) {
// Unable to compile regexp.
Handle<JSArray> array = Factory::NewJSArray(2);
SetElement(array, 0, pattern);
SetElement(array,
1,
Factory::NewStringFromUtf8(CStrVector(result.error_message)));
Handle<FixedArray> elements = Factory::NewFixedArray(2);
elements->set(0, *pattern);
Handle<String> error_message =
Factory::NewStringFromUtf8(CStrVector(result.error_message));
elements->set(1, *error_message);
Handle<JSArray> array = Factory::NewJSArrayWithElements(elements);
Handle<Object> regexp_err =
Factory::NewSyntaxError("malformed_regexp", array);
Top::Throw(*regexp_err);

7
src/objects.cc
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@ -6522,13 +6522,6 @@ void JSArray::Expand(int required_size) {
}
// Computes the new capacity when expanding the elements of a JSObject.
static int NewElementsCapacity(int old_capacity) {
// (old_capacity + 50%) + 16
return old_capacity + (old_capacity >> 1) + 16;
}
static Failure* ArrayLengthRangeError() {
HandleScope scope;
return Top::Throw(*Factory::NewRangeError("invalid_array_length",

6
src/objects.h
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@ -1515,6 +1515,12 @@ class JSObject: public HeapObject {
inline bool HasElement(uint32_t index);
bool HasElementWithReceiver(JSObject* receiver, uint32_t index);
// Computes the new capacity when expanding the elements of a JSObject.
static int NewElementsCapacity(int old_capacity) {
// (old_capacity + 50%) + 16
return old_capacity + (old_capacity >> 1) + 16;
}
// Tells whether the index'th element is present and how it is stored.
enum LocalElementType {
// There is no element with given index.

25
src/parser.cc
View File

@ -803,10 +803,12 @@ void Parser::ReportMessageAt(Scanner::Location source_location,
MessageLocation location(script_,
source_location.beg_pos,
source_location.end_pos);
Handle<JSArray> array = Factory::NewJSArray(args.length());
Handle<FixedArray> elements = Factory::NewFixedArray(args.length());
for (int i = 0; i < args.length(); i++) {
SetElement(array, i, Factory::NewStringFromUtf8(CStrVector(args[i])));
Handle<String> arg_string = Factory::NewStringFromUtf8(CStrVector(args[i]));
elements->set(i, *arg_string);
}
Handle<JSArray> array = Factory::NewJSArrayWithElements(elements);
Handle<Object> result = Factory::NewSyntaxError(type, array);
Top::Throw(*result, &location);
}
@ -818,10 +820,11 @@ void Parser::ReportMessageAt(Scanner::Location source_location,
MessageLocation location(script_,
source_location.beg_pos,
source_location.end_pos);
Handle<JSArray> array = Factory::NewJSArray(args.length());
Handle<FixedArray> elements = Factory::NewFixedArray(args.length());
for (int i = 0; i < args.length(); i++) {
SetElement(array, i, args[i]);
elements->set(i, *args[i]);
}
Handle<JSArray> array = Factory::NewJSArrayWithElements(elements);
Handle<Object> result = Factory::NewSyntaxError(type, array);
Top::Throw(*result, &location);
}
@ -4035,12 +4038,14 @@ Handle<Object> JsonParser::ParseJson(Handle<String> script,
MessageLocation location(Factory::NewScript(script),
source_location.beg_pos,
source_location.end_pos);
int argc = (name_opt == NULL) ? 0 : 1;
Handle<JSArray> array = Factory::NewJSArray(argc);
if (name_opt != NULL) {
SetElement(array,
0,
Factory::NewStringFromUtf8(CStrVector(name_opt)));
Handle<JSArray> array;
if (name_opt == NULL) {
array = Factory::NewJSArray(0);
} else {
Handle<String> name = Factory::NewStringFromUtf8(CStrVector(name_opt));
Handle<FixedArray> element = Factory::NewFixedArray(1);
element->set(0, *name);
array = Factory::NewJSArrayWithElements(element);
}
Handle<Object> result = Factory::NewSyntaxError(message, array);
Top::Throw(*result, &location);

71
src/runtime.cc
View File

@ -789,6 +789,7 @@ static MaybeObject* Runtime_GetOwnProperty(Arguments args) {
case JSObject::FAST_ELEMENT: {
elms->set(IS_ACCESSOR_INDEX, Heap::false_value());
Handle<Object> value = GetElement(obj, index);
RETURN_IF_EMPTY_HANDLE(value);
elms->set(VALUE_INDEX, *value);
elms->set(WRITABLE_INDEX, Heap::true_value());
elms->set(ENUMERABLE_INDEX, Heap::true_value());
@ -826,6 +827,7 @@ static MaybeObject* Runtime_GetOwnProperty(Arguments args) {
// This is a data property.
elms->set(IS_ACCESSOR_INDEX, Heap::false_value());
Handle<Object> value = GetElement(obj, index);
ASSERT(!value.is_null());
elms->set(VALUE_INDEX, *value);
elms->set(WRITABLE_INDEX, Heap::ToBoolean(!details.IsReadOnly()));
break;
@ -1469,7 +1471,7 @@ static MaybeObject* Runtime_InitializeConstContextSlot(Arguments args) {
// The holder is an arguments object.
ASSERT((attributes & READ_ONLY) == 0);
Handle<JSObject> arguments(Handle<JSObject>::cast(holder));
SetElement(arguments, index, value);
RETURN_IF_EMPTY_HANDLE(SetElement(arguments, index, value));
}
return *value;
}
@ -8384,8 +8386,9 @@ static void CollectElementIndices(Handle<JSObject> object,
* with the element index and the element's value.
* Afterwards it increments the base-index of the visitor by the array
* length.
* Returns false if any access threw an exception, otherwise true.
*/
static void IterateElements(Handle<JSArray> receiver,
static bool IterateElements(Handle<JSArray> receiver,
ArrayConcatVisitor* visitor) {
uint32_t length = static_cast<uint32_t>(receiver->length()->Number());
switch (receiver->GetElementsKind()) {
@ -8404,6 +8407,7 @@ static void IterateElements(Handle<JSArray> receiver,
// Call GetElement on receiver, not its prototype, or getters won't
// have the correct receiver.
element_value = GetElement(receiver, j);
if (element_value.is_null()) return false;
visitor->visit(j, element_value);
}
}
@ -8422,6 +8426,7 @@ static void IterateElements(Handle<JSArray> receiver,
HandleScope loop_scope;
uint32_t index = indices[j];
Handle<Object> element = GetElement(receiver, index);
if (element.is_null()) return false;
visitor->visit(index, element);
// Skip to next different index (i.e., omit duplicates).
do {
@ -8478,6 +8483,7 @@ static void IterateElements(Handle<JSArray> receiver,
break;
}
visitor->increase_index_offset(length);
return true;
}
@ -8559,7 +8565,9 @@ static MaybeObject* Runtime_ArrayConcat(Arguments args) {
Handle<Object> obj(elements->get(i));
if (obj->IsJSArray()) {
Handle<JSArray> array = Handle<JSArray>::cast(obj);
IterateElements(array, &visitor);
if (!IterateElements(array, &visitor)) {
return Failure::Exception();
}
} else {
visitor.visit(0, obj);
visitor.increase_index_offset(1);
@ -8657,10 +8665,12 @@ static MaybeObject* Runtime_SwapElements(Arguments args) {
Handle<JSObject> jsobject = Handle<JSObject>::cast(object);
Handle<Object> tmp1 = GetElement(jsobject, index1);
RETURN_IF_EMPTY_HANDLE(tmp1);
Handle<Object> tmp2 = GetElement(jsobject, index2);
RETURN_IF_EMPTY_HANDLE(tmp2);
SetElement(jsobject, index1, tmp2);
SetElement(jsobject, index2, tmp1);
RETURN_IF_EMPTY_HANDLE(SetElement(jsobject, index1, tmp2));
RETURN_IF_EMPTY_HANDLE(SetElement(jsobject, index2, tmp1));
return Heap::undefined_value();
}
@ -11266,7 +11276,8 @@ static MaybeObject* Runtime_CollectStackTrace(Arguments args) {
limit = Max(limit, 0); // Ensure that limit is not negative.
int initial_size = Min(limit, 10);
Handle<JSArray> result = Factory::NewJSArray(initial_size * 4);
Handle<FixedArray> elements =
Factory::NewFixedArrayWithHoles(initial_size * 4);
StackFrameIterator iter;
// If the caller parameter is a function we skip frames until we're
@ -11282,27 +11293,30 @@ static MaybeObject* Runtime_CollectStackTrace(Arguments args) {
List<FrameSummary> frames(3); // Max 2 levels of inlining.
frame->Summarize(&frames);
for (int i = frames.length() - 1; i >= 0; i--) {
if (cursor + 4 > elements->length()) {
int new_capacity = JSObject::NewElementsCapacity(elements->length());
Handle<FixedArray> new_elements =
Factory::NewFixedArrayWithHoles(new_capacity);
for (int i = 0; i < cursor; i++) {
new_elements->set(i, elements->get(i));
}
elements = new_elements;
}
ASSERT(cursor + 4 <= elements->length());
Handle<Object> recv = frames[i].receiver();
Handle<JSFunction> fun = frames[i].function();
Handle<Code> code = frames[i].code();
Handle<Smi> offset(Smi::FromInt(frames[i].offset()));
FixedArray* elements = FixedArray::cast(result->elements());
if (cursor + 3 < elements->length()) {
elements->set(cursor++, *recv);
elements->set(cursor++, *fun);
elements->set(cursor++, *code);
elements->set(cursor++, *offset);
} else {
SetElement(result, cursor++, recv);
SetElement(result, cursor++, fun);
SetElement(result, cursor++, code);
SetElement(result, cursor++, offset);
}
elements->set(cursor++, *recv);
elements->set(cursor++, *fun);
elements->set(cursor++, *code);
elements->set(cursor++, *offset);
}
}
iter.Advance();
}
Handle<JSArray> result = Factory::NewJSArrayWithElements(elements);
result->set_length(Smi::FromInt(cursor));
return *result;
}
@ -11467,7 +11481,13 @@ static MaybeObject* Runtime_MessageGetScript(Arguments args) {
static MaybeObject* Runtime_ListNatives(Arguments args) {
ASSERT(args.length() == 0);
HandleScope scope;
Handle<JSArray> result = Factory::NewJSArray(0);
#define COUNT_ENTRY(Name, argc, ressize) + 1
int entry_count = 0
RUNTIME_FUNCTION_LIST(COUNT_ENTRY)
INLINE_FUNCTION_LIST(COUNT_ENTRY)
INLINE_RUNTIME_FUNCTION_LIST(COUNT_ENTRY);
#undef COUNT_ENTRY
Handle<FixedArray> elements = Factory::NewFixedArray(entry_count);
int index = 0;
bool inline_runtime_functions = false;
#define ADD_ENTRY(Name, argc, ressize) \
@ -11482,10 +11502,11 @@ static MaybeObject* Runtime_ListNatives(Arguments args) {
name = Factory::NewStringFromAscii( \
Vector<const char>(#Name, StrLength(#Name))); \
} \
Handle<JSArray> pair = Factory::NewJSArray(0); \
SetElement(pair, 0, name); \
SetElement(pair, 1, Handle<Smi>(Smi::FromInt(argc))); \
SetElement(result, index++, pair); \
Handle<FixedArray> pair_elements = Factory::NewFixedArray(2); \
pair_elements->set(0, *name); \
pair_elements->set(1, Smi::FromInt(argc)); \
Handle<JSArray> pair = Factory::NewJSArrayWithElements(pair_elements); \
elements->set(index++, *pair); \
}
inline_runtime_functions = false;
RUNTIME_FUNCTION_LIST(ADD_ENTRY)
@ -11493,6 +11514,8 @@ static MaybeObject* Runtime_ListNatives(Arguments args) {
INLINE_FUNCTION_LIST(ADD_ENTRY)
INLINE_RUNTIME_FUNCTION_LIST(ADD_ENTRY)
#undef ADD_ENTRY
ASSERT_EQ(index, entry_count);
Handle<JSArray> result = Factory::NewJSArrayWithElements(elements);
return *result;
}
#endif