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Reorder checks in Runtime_TypedArrayInitialize*

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All checks must be performed before any side effects, so we get atomic transactions

BUG=chromium:374443
LOG=n
R=dslomov@chromium.org

Review URL: https://codereview.chromium.org/298843003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21410 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
This commit is contained in:
jkummerow@chromium.org 2014-05-21 12:36:37 +00:00
parent ccf8b20443
commit 38cfd30b69
1 changed files with 26 additions and 23 deletions
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49
src/runtime.cc
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@ -960,13 +960,6 @@ RUNTIME_FUNCTION(Runtime_TypedArrayInitialize) {
RUNTIME_ASSERT(arrayId >= Runtime::ARRAY_ID_FIRST &&
arrayId <= Runtime::ARRAY_ID_LAST);
RUNTIME_ASSERT(maybe_buffer->IsNull() || maybe_buffer->IsJSArrayBuffer());
ASSERT(holder->GetInternalFieldCount() ==
v8::ArrayBufferView::kInternalFieldCount);
for (int i = 0; i < v8::ArrayBufferView::kInternalFieldCount; i++) {
holder->SetInternalField(i, Smi::FromInt(0));
}
ExternalArrayType array_type = kExternalInt8Array; // Bogus initialization.
size_t element_size = 1; // Bogus initialization.
@ -978,7 +971,6 @@ RUNTIME_FUNCTION(Runtime_TypedArrayInitialize) {
&external_elements_kind,
&fixed_elements_kind,
&element_size);
RUNTIME_ASSERT(holder->map()->elements_kind() == fixed_elements_kind);
size_t byte_offset = 0;
@ -986,8 +978,15 @@ RUNTIME_FUNCTION(Runtime_TypedArrayInitialize) {
RUNTIME_ASSERT(TryNumberToSize(isolate, *byte_offset_object, &byte_offset));
RUNTIME_ASSERT(TryNumberToSize(isolate, *byte_length_object, &byte_length));
holder->set_byte_offset(*byte_offset_object);
holder->set_byte_length(*byte_length_object);
if (maybe_buffer->IsJSArrayBuffer()) {
Handle<JSArrayBuffer> buffer = Handle<JSArrayBuffer>::cast(maybe_buffer);
size_t array_buffer_byte_length =
NumberToSize(isolate, buffer->byte_length());
RUNTIME_ASSERT(byte_offset <= array_buffer_byte_length);
RUNTIME_ASSERT(array_buffer_byte_length - byte_offset >= byte_length);
} else {
RUNTIME_ASSERT(maybe_buffer->IsNull());
}
RUNTIME_ASSERT(byte_length % element_size == 0);
size_t length = byte_length / element_size;
@ -998,16 +997,20 @@ RUNTIME_FUNCTION(Runtime_TypedArrayInitialize) {
HandleVector<Object>(NULL, 0)));
}
// All checks are done, now we can modify objects.
ASSERT(holder->GetInternalFieldCount() ==
v8::ArrayBufferView::kInternalFieldCount);
for (int i = 0; i < v8::ArrayBufferView::kInternalFieldCount; i++) {
holder->SetInternalField(i, Smi::FromInt(0));
}
Handle<Object> length_obj = isolate->factory()->NewNumberFromSize(length);
holder->set_length(*length_obj);
holder->set_byte_offset(*byte_offset_object);
holder->set_byte_length(*byte_length_object);
if (!maybe_buffer->IsNull()) {
Handle<JSArrayBuffer> buffer(JSArrayBuffer::cast(*maybe_buffer));
size_t array_buffer_byte_length =
NumberToSize(isolate, buffer->byte_length());
RUNTIME_ASSERT(byte_offset <= array_buffer_byte_length);
RUNTIME_ASSERT(array_buffer_byte_length - byte_offset >= byte_length);
Handle<JSArrayBuffer> buffer = Handle<JSArrayBuffer>::cast(maybe_buffer);
holder->set_buffer(*buffer);
holder->set_weak_next(buffer->weak_first_view());
buffer->set_weak_first_view(*holder);
@ -1048,12 +1051,6 @@ RUNTIME_FUNCTION(Runtime_TypedArrayInitializeFromArrayLike) {
RUNTIME_ASSERT(arrayId >= Runtime::ARRAY_ID_FIRST &&
arrayId <= Runtime::ARRAY_ID_LAST);
ASSERT(holder->GetInternalFieldCount() ==
v8::ArrayBufferView::kInternalFieldCount);
for (int i = 0; i < v8::ArrayBufferView::kInternalFieldCount; i++) {
holder->SetInternalField(i, Smi::FromInt(0));
}
ExternalArrayType array_type = kExternalInt8Array; // Bogus initialization.
size_t element_size = 1; // Bogus initialization.
ElementsKind external_elements_kind =
@ -1083,6 +1080,12 @@ RUNTIME_FUNCTION(Runtime_TypedArrayInitializeFromArrayLike) {
}
size_t byte_length = length * element_size;
ASSERT(holder->GetInternalFieldCount() ==
v8::ArrayBufferView::kInternalFieldCount);
for (int i = 0; i < v8::ArrayBufferView::kInternalFieldCount; i++) {
holder->SetInternalField(i, Smi::FromInt(0));
}
// NOTE: not initializing backing store.
// We assume that the caller of this function will initialize holder
// with the loop