Revision: 25179
Author: [email protected]
Date: Thu Nov 6 08:28:37 2014 UTC
Log: Retry: Parser & internalization fix: ensure no heap allocs during
GetString(Handle<String>).
The bug has always been there: when the parser is operating in
the "immediately
internalize" mode and calls GetString, we get FlatContent of a string and
then
do heap allocation.
The bug was uncovered by https://codereview.chromium.org/693803004/ (which
put
the parser to the "immediately internalize" mode more often), but looking
at the
code, it's possible that it can happen in other cases too.
This CL makes AstValueFactory handle this situation gracefully: it won't
try to
internalize inside GetString(Handle<String>); it's unnecessary anyway since
we
have the Handle<String> already.
BUG=
[email protected]
Review URL: https://codereview.chromium.org/706533005
https://code.google.com/p/v8/source/detail?r=25179
Modified:
/branches/bleeding_edge/src/ast-value-factory.cc
/branches/bleeding_edge/src/ast-value-factory.h
=======================================
--- /branches/bleeding_edge/src/ast-value-factory.cc Wed Nov 5 14:31:57
2014 UTC
+++ /branches/bleeding_edge/src/ast-value-factory.cc Thu Nov 6 08:28:37
2014 UTC
@@ -212,7 +212,7 @@
}
-const AstRawString* AstValueFactory::GetOneByteString(
+AstRawString* AstValueFactory::GetOneByteStringInternal(
Vector<const uint8_t> literal) {
uint32_t hash = StringHasher::HashSequentialString<uint8_t>(
literal.start(), literal.length(), hash_seed_);
@@ -220,7 +220,7 @@
}
-const AstRawString* AstValueFactory::GetTwoByteString(
+AstRawString* AstValueFactory::GetTwoByteStringInternal(
Vector<const uint16_t> literal) {
uint32_t hash = StringHasher::HashSequentialString<uint16_t>(
literal.start(), literal.length(), hash_seed_);
@@ -229,13 +229,24 @@
const AstRawString* AstValueFactory::GetString(Handle<String> literal) {
- DisallowHeapAllocation no_gc;
- String::FlatContent content = literal->GetFlatContent();
- if (content.IsOneByte()) {
- return GetOneByteString(content.ToOneByteVector());
+ // For the FlatContent to stay valid, we shouldn't do any heap
+ // allocation. Make sure we won't try to internalize the string in
GetString.
+ AstRawString* result = NULL;
+ Isolate* saved_isolate = isolate_;
+ isolate_ = NULL;
+ {
+ DisallowHeapAllocation no_gc;
+ String::FlatContent content = literal->GetFlatContent();
+ if (content.IsOneByte()) {
+ result = GetOneByteStringInternal(content.ToOneByteVector());
+ } else {
+ DCHECK(content.IsTwoByte());
+ result = GetTwoByteStringInternal(content.ToUC16Vector());
+ }
}
- DCHECK(content.IsTwoByte());
- return GetTwoByteString(content.ToUC16Vector());
+ isolate_ = saved_isolate;
+ if (isolate_) result->Internalize(isolate_);
+ return result;
}
@@ -348,8 +359,8 @@
#undef GENERATE_VALUE_GETTER
-const AstRawString* AstValueFactory::GetString(
- uint32_t hash, bool is_one_byte, Vector<const byte> literal_bytes) {
+AstRawString* AstValueFactory::GetString(uint32_t hash, bool is_one_byte,
+ Vector<const byte> literal_bytes)
{
// literal_bytes here points to whatever the user passed, and this is OK
// because we use vector_compare (which checks the contents) to compare
// against the AstRawStrings which are in the string_table_. We should
not
=======================================
--- /branches/bleeding_edge/src/ast-value-factory.h Wed Nov 5 14:31:57
2014 UTC
+++ /branches/bleeding_edge/src/ast-value-factory.h Thu Nov 6 08:28:37
2014 UTC
@@ -287,12 +287,16 @@
Zone* zone() const { return zone_; }
- const AstRawString* GetOneByteString(Vector<const uint8_t> literal);
+ const AstRawString* GetOneByteString(Vector<const uint8_t> literal) {
+ return GetOneByteStringInternal(literal);
+ }
const AstRawString* GetOneByteString(const char* string) {
return GetOneByteString(Vector<const uint8_t>(
reinterpret_cast<const uint8_t*>(string), StrLength(string)));
}
- const AstRawString* GetTwoByteString(Vector<const uint16_t> literal);
+ const AstRawString* GetTwoByteString(Vector<const uint16_t> literal) {
+ return GetTwoByteStringInternal(literal);
+ }
const AstRawString* GetString(Handle<String> literal);
const AstConsString* NewConsString(const AstString* left,
const AstString* right);
@@ -327,8 +331,10 @@
const AstValue* NewTheHole();
private:
- const AstRawString* GetString(uint32_t hash, bool is_one_byte,
- Vector<const byte> literal_bytes);
+ AstRawString* GetOneByteStringInternal(Vector<const uint8_t> literal);
+ AstRawString* GetTwoByteStringInternal(Vector<const uint16_t> literal);
+ AstRawString* GetString(uint32_t hash, bool is_one_byte,
+ Vector<const byte> literal_bytes);
// All strings are copied here, one after another (no NULLs inbetween).
HashMap string_table_;
--
--
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