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-rw-r--r--deps/v8/src/frames.h102
1 files changed, 69 insertions, 33 deletions
diff --git a/deps/v8/src/frames.h b/deps/v8/src/frames.h
index 102244c9b..20111904f 100644
--- a/deps/v8/src/frames.h
+++ b/deps/v8/src/frames.h
@@ -46,6 +46,32 @@ class Top;
class ThreadLocalTop;
+class PcToCodeCache : AllStatic {
+ public:
+ struct PcToCodeCacheEntry {
+ Address pc;
+ Code* code;
+ };
+
+ static PcToCodeCacheEntry* cache(int index) {
+ return &cache_[index];
+ }
+
+ static Code* GcSafeFindCodeForPc(Address pc);
+ static Code* GcSafeCastToCode(HeapObject* object, Address pc);
+
+ static void FlushPcToCodeCache() {
+ memset(&cache_[0], 0, sizeof(cache_));
+ }
+
+ static PcToCodeCacheEntry* GetCacheEntry(Address pc);
+
+ private:
+ static const int kPcToCodeCacheSize = 256;
+ static PcToCodeCacheEntry cache_[kPcToCodeCacheSize];
+};
+
+
class StackHandler BASE_EMBEDDED {
public:
enum State {
@@ -64,7 +90,7 @@ class StackHandler BASE_EMBEDDED {
inline bool includes(Address address) const;
// Garbage collection support.
- inline void Iterate(ObjectVisitor* v) const;
+ inline void Iterate(ObjectVisitor* v, Code* holder) const;
// Conversion support.
static inline StackHandler* FromAddress(Address address);
@@ -74,16 +100,11 @@ class StackHandler BASE_EMBEDDED {
bool is_try_catch() { return state() == TRY_CATCH; }
bool is_try_finally() { return state() == TRY_FINALLY; }
- // Garbage collection support.
- void Cook(Code* code);
- void Uncook(Code* code);
-
private:
// Accessors.
inline State state() const;
- inline Address pc() const;
- inline void set_pc(Address value);
+ inline Address* pc_address() const;
DISALLOW_IMPLICIT_CONSTRUCTORS(StackHandler);
};
@@ -112,7 +133,13 @@ class StackFrame BASE_EMBEDDED {
// Opaque data type for identifying stack frames. Used extensively
// by the debugger.
- enum Id { NO_ID = 0 };
+ // ID_MIN_VALUE and ID_MAX_VALUE are specified to ensure that enumeration type
+ // has correct value range (see Issue 830 for more details).
+ enum Id {
+ ID_MIN_VALUE = kMinInt,
+ ID_MAX_VALUE = kMaxInt,
+ NO_ID = 0
+ };
// Copy constructor; it breaks the connection to host iterator.
StackFrame(const StackFrame& original) {
@@ -152,13 +179,20 @@ class StackFrame BASE_EMBEDDED {
virtual Type type() const = 0;
// Get the code associated with this frame.
- virtual Code* code() const = 0;
+ // This method could be called during marking phase of GC.
+ virtual Code* unchecked_code() const = 0;
- // Garbage collection support.
- static void CookFramesForThread(ThreadLocalTop* thread);
- static void UncookFramesForThread(ThreadLocalTop* thread);
+ // Get the code associated with this frame.
+ Code* code() const { return GetContainingCode(pc()); }
+
+ // Get the code object that contains the given pc.
+ Code* GetContainingCode(Address pc) const {
+ return PcToCodeCache::GetCacheEntry(pc)->code;
+ }
+
+ virtual void Iterate(ObjectVisitor* v) const = 0;
+ static void IteratePc(ObjectVisitor* v, Address* pc_address, Code* holder);
- virtual void Iterate(ObjectVisitor* v) const { }
// Printing support.
enum PrintMode { OVERVIEW, DETAILS };
@@ -200,10 +234,6 @@ class StackFrame BASE_EMBEDDED {
// Get the type and the state of the calling frame.
virtual Type GetCallerState(State* state) const;
- // Cooking/uncooking support.
- void Cook();
- void Uncook();
-
friend class StackFrameIterator;
friend class StackHandlerIterator;
friend class SafeStackFrameIterator;
@@ -218,7 +248,7 @@ class EntryFrame: public StackFrame {
public:
virtual Type type() const { return ENTRY; }
- virtual Code* code() const;
+ virtual Code* unchecked_code() const;
// Garbage collection support.
virtual void Iterate(ObjectVisitor* v) const;
@@ -249,7 +279,7 @@ class EntryConstructFrame: public EntryFrame {
public:
virtual Type type() const { return ENTRY_CONSTRUCT; }
- virtual Code* code() const;
+ virtual Code* unchecked_code() const;
static EntryConstructFrame* cast(StackFrame* frame) {
ASSERT(frame->is_entry_construct());
@@ -268,10 +298,9 @@ class EntryConstructFrame: public EntryFrame {
// Exit frames are used to exit JavaScript execution and go to C.
class ExitFrame: public StackFrame {
public:
- enum Mode { MODE_NORMAL, MODE_DEBUG };
virtual Type type() const { return EXIT; }
- virtual Code* code() const;
+ virtual Code* unchecked_code() const;
Object*& code_slot() const;
@@ -397,7 +426,7 @@ class JavaScriptFrame: public StandardFrame {
int index) const;
// Determine the code for the frame.
- virtual Code* code() const;
+ virtual Code* unchecked_code() const;
static JavaScriptFrame* cast(StackFrame* frame) {
ASSERT(frame->is_java_script());
@@ -406,19 +435,11 @@ class JavaScriptFrame: public StandardFrame {
protected:
explicit JavaScriptFrame(StackFrameIterator* iterator)
- : StandardFrame(iterator), disable_heap_access_(false) { }
+ : StandardFrame(iterator) { }
virtual Address GetCallerStackPointer() const;
- // When this mode is enabled it is not allowed to access heap objects.
- // This is a special mode used when gathering stack samples in profiler.
- // A shortcoming is that caller's SP value will be calculated incorrectly
- // (see GetCallerStackPointer implementation), but it is not used for stack
- // sampling.
- void DisableHeapAccess() { disable_heap_access_ = true; }
-
private:
- bool disable_heap_access_;
inline Object* function_slot_object() const;
friend class StackFrameIterator;
@@ -433,7 +454,7 @@ class ArgumentsAdaptorFrame: public JavaScriptFrame {
virtual Type type() const { return ARGUMENTS_ADAPTOR; }
// Determine the code for the frame.
- virtual Code* code() const;
+ virtual Code* unchecked_code() const;
static ArgumentsAdaptorFrame* cast(StackFrame* frame) {
ASSERT(frame->is_arguments_adaptor());
@@ -463,7 +484,7 @@ class InternalFrame: public StandardFrame {
virtual void Iterate(ObjectVisitor* v) const;
// Determine the code for the frame.
- virtual Code* code() const;
+ virtual Code* unchecked_code() const;
static InternalFrame* cast(StackFrame* frame) {
ASSERT(frame->is_internal());
@@ -625,6 +646,8 @@ class SafeStackFrameIterator BASE_EMBEDDED {
void Advance();
void Reset();
+ static bool is_active() { return active_count_ > 0; }
+
static bool IsWithinBounds(
Address low_bound, Address high_bound, Address addr) {
return low_bound <= addr && addr <= high_bound;
@@ -638,6 +661,19 @@ class SafeStackFrameIterator BASE_EMBEDDED {
bool IsValidFrame(StackFrame* frame) const;
bool IsValidCaller(StackFrame* frame);
+ // This is a nasty hack to make sure the active count is incremented
+ // before the constructor for the embedded iterator is invoked. This
+ // is needed because the constructor will start looking at frames
+ // right away and we need to make sure it doesn't start inspecting
+ // heap objects.
+ class ActiveCountMaintainer BASE_EMBEDDED {
+ public:
+ ActiveCountMaintainer() { active_count_++; }
+ ~ActiveCountMaintainer() { active_count_--; }
+ };
+
+ ActiveCountMaintainer maintainer_;
+ static int active_count_;
Address low_bound_;
Address high_bound_;
const bool is_valid_top_;
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