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// Copyright 2006-2008 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following
// disclaimer in the documentation and/or other materials provided
// with the distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#ifndef V8_FRAMES_H_
#define V8_FRAMES_H_
namespace v8 {
namespace internal {
typedef uint32_t RegList;
// Get the number of registers in a given register list.
int NumRegs(RegList list);
// Return the code of the n-th saved register available to JavaScript.
int JSCallerSavedCode(int n);
// Forward declarations.
class StackFrameIterator;
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 = 1024;
static PcToCodeCacheEntry cache_[kPcToCodeCacheSize];
};
class StackHandler BASE_EMBEDDED {
public:
enum State {
ENTRY,
TRY_CATCH,
TRY_FINALLY
};
// Get the address of this stack handler.
inline Address address() const;
// Get the next stack handler in the chain.
inline StackHandler* next() const;
// Tells whether the given address is inside this handler.
inline bool includes(Address address) const;
// Garbage collection support.
inline void Iterate(ObjectVisitor* v, Code* holder) const;
// Conversion support.
static inline StackHandler* FromAddress(Address address);
// Testers
bool is_entry() { return state() == ENTRY; }
bool is_try_catch() { return state() == TRY_CATCH; }
bool is_try_finally() { return state() == TRY_FINALLY; }
private:
// Accessors.
inline State state() const;
inline Address* pc_address() const;
DISALLOW_IMPLICIT_CONSTRUCTORS(StackHandler);
};
#define STACK_FRAME_TYPE_LIST(V) \
V(ENTRY, EntryFrame) \
V(ENTRY_CONSTRUCT, EntryConstructFrame) \
V(EXIT, ExitFrame) \
V(JAVA_SCRIPT, JavaScriptFrame) \
V(INTERNAL, InternalFrame) \
V(CONSTRUCT, ConstructFrame) \
V(ARGUMENTS_ADAPTOR, ArgumentsAdaptorFrame)
// Abstract base class for all stack frames.
class StackFrame BASE_EMBEDDED {
public:
#define DECLARE_TYPE(type, ignore) type,
enum Type {
NONE = 0,
STACK_FRAME_TYPE_LIST(DECLARE_TYPE)
NUMBER_OF_TYPES
};
#undef DECLARE_TYPE
// Opaque data type for identifying stack frames. Used extensively
// by the debugger.
// 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
};
struct State {
State() : sp(NULL), fp(NULL), pc_address(NULL) { }
Address sp;
Address fp;
Address* pc_address;
};
// Copy constructor; it breaks the connection to host iterator.
StackFrame(const StackFrame& original) {
this->state_ = original.state_;
this->iterator_ = NULL;
}
// Type testers.
bool is_entry() const { return type() == ENTRY; }
bool is_entry_construct() const { return type() == ENTRY_CONSTRUCT; }
bool is_exit() const { return type() == EXIT; }
bool is_java_script() const { return type() == JAVA_SCRIPT; }
bool is_arguments_adaptor() const { return type() == ARGUMENTS_ADAPTOR; }
bool is_internal() const { return type() == INTERNAL; }
bool is_construct() const { return type() == CONSTRUCT; }
virtual bool is_standard() const { return false; }
// Accessors.
Address sp() const { return state_.sp; }
Address fp() const { return state_.fp; }
Address caller_sp() const { return GetCallerStackPointer(); }
Address pc() const { return *pc_address(); }
void set_pc(Address pc) { *pc_address() = pc; }
virtual void SetCallerFp(Address caller_fp) = 0;
Address* pc_address() const { return state_.pc_address; }
// Get the id of this stack frame.
Id id() const { return static_cast<Id>(OffsetFrom(caller_sp())); }
// Checks if this frame includes any stack handlers.
bool HasHandler() const;
// Get the type of this frame.
virtual Type type() const = 0;
// Get the code associated with this frame.
// This method could be called during marking phase of GC.
virtual Code* unchecked_code() const = 0;
// 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);
// Printing support.
enum PrintMode { OVERVIEW, DETAILS };
virtual void Print(StringStream* accumulator,
PrintMode mode,
int index) const { }
protected:
explicit StackFrame(StackFrameIterator* iterator) : iterator_(iterator) { }
virtual ~StackFrame() { }
// Compute the stack pointer for the calling frame.
virtual Address GetCallerStackPointer() const = 0;
// Printing support.
static void PrintIndex(StringStream* accumulator,
PrintMode mode,
int index);
// Get the top handler from the current stack iterator.
inline StackHandler* top_handler() const;
// Compute the stack frame type for the given state.
static Type ComputeType(State* state);
private:
const StackFrameIterator* iterator_;
State state_;
// Fill in the state of the calling frame.
virtual void ComputeCallerState(State* state) const = 0;
// Get the type and the state of the calling frame.
virtual Type GetCallerState(State* state) const;
friend class StackFrameIterator;
friend class StackHandlerIterator;
friend class SafeStackFrameIterator;
private:
void operator=(const StackFrame& original);
};
// Entry frames are used to enter JavaScript execution from C.
class EntryFrame: public StackFrame {
public:
virtual Type type() const { return ENTRY; }
virtual Code* unchecked_code() const;
// Garbage collection support.
virtual void Iterate(ObjectVisitor* v) const;
static EntryFrame* cast(StackFrame* frame) {
ASSERT(frame->is_entry());
return static_cast<EntryFrame*>(frame);
}
virtual void SetCallerFp(Address caller_fp);
protected:
explicit EntryFrame(StackFrameIterator* iterator) : StackFrame(iterator) { }
// The caller stack pointer for entry frames is always zero. The
// real information about the caller frame is available through the
// link to the top exit frame.
virtual Address GetCallerStackPointer() const { return 0; }
private:
virtual void ComputeCallerState(State* state) const;
virtual Type GetCallerState(State* state) const;
friend class StackFrameIterator;
};
class EntryConstructFrame: public EntryFrame {
public:
virtual Type type() const { return ENTRY_CONSTRUCT; }
virtual Code* unchecked_code() const;
static EntryConstructFrame* cast(StackFrame* frame) {
ASSERT(frame->is_entry_construct());
return static_cast<EntryConstructFrame*>(frame);
}
protected:
explicit EntryConstructFrame(StackFrameIterator* iterator)
: EntryFrame(iterator) { }
private:
friend class StackFrameIterator;
};
// Exit frames are used to exit JavaScript execution and go to C.
class ExitFrame: public StackFrame {
public:
virtual Type type() const { return EXIT; }
virtual Code* unchecked_code() const;
Object*& code_slot() const;
// Garbage collection support.
virtual void Iterate(ObjectVisitor* v) const;
virtual void SetCallerFp(Address caller_fp);
static ExitFrame* cast(StackFrame* frame) {
ASSERT(frame->is_exit());
return static_cast<ExitFrame*>(frame);
}
// Compute the state and type of an exit frame given a frame
// pointer. Used when constructing the first stack frame seen by an
// iterator and the frames following entry frames.
static Type GetStateForFramePointer(Address fp, State* state);
static Address ComputeStackPointer(Address fp);
static void FillState(Address fp, Address sp, State* state);
protected:
explicit ExitFrame(StackFrameIterator* iterator) : StackFrame(iterator) { }
virtual Address GetCallerStackPointer() const;
private:
virtual void ComputeCallerState(State* state) const;
friend class StackFrameIterator;
};
class StandardFrame: public StackFrame {
public:
// Testers.
virtual bool is_standard() const { return true; }
// Accessors.
inline Object* context() const;
// Access the expressions in the stack frame including locals.
inline Object* GetExpression(int index) const;
inline void SetExpression(int index, Object* value);
int ComputeExpressionsCount() const;
virtual void SetCallerFp(Address caller_fp);
static StandardFrame* cast(StackFrame* frame) {
ASSERT(frame->is_standard());
return static_cast<StandardFrame*>(frame);
}
protected:
explicit StandardFrame(StackFrameIterator* iterator)
: StackFrame(iterator) { }
virtual void ComputeCallerState(State* state) const;
// Accessors.
inline Address caller_fp() const;
inline Address caller_pc() const;
// Computes the address of the PC field in the standard frame given
// by the provided frame pointer.
static inline Address ComputePCAddress(Address fp);
// Iterate over expression stack including stack handlers, locals,
// and parts of the fixed part including context and code fields.
void IterateExpressions(ObjectVisitor* v) const;
// Returns the address of the n'th expression stack element.
Address GetExpressionAddress(int n) const;
// Determines if the n'th expression stack element is in a stack
// handler or not. Requires traversing all handlers in this frame.
bool IsExpressionInsideHandler(int n) const;
// Determines if the standard frame for the given frame pointer is
// an arguments adaptor frame.
static inline bool IsArgumentsAdaptorFrame(Address fp);
// Determines if the standard frame for the given frame pointer is a
// construct frame.
static inline bool IsConstructFrame(Address fp);
private:
friend class StackFrame;
friend class StackFrameIterator;
};
class JavaScriptFrame: public StandardFrame {
public:
virtual Type type() const { return JAVA_SCRIPT; }
// Accessors.
inline Object* function() const;
inline Object* receiver() const;
inline void set_receiver(Object* value);
// Access the parameters.
Object* GetParameter(int index) const;
int ComputeParametersCount() const;
// Temporary way of getting access to the number of parameters
// passed on the stack by the caller. Once argument adaptor frames
// has been introduced on ARM, this number will always match the
// computed parameters count.
int GetProvidedParametersCount() const;
// Check if this frame is a constructor frame invoked through 'new'.
bool IsConstructor() const;
// Check if this frame has "adapted" arguments in the sense that the
// actual passed arguments are available in an arguments adaptor
// frame below it on the stack.
inline bool has_adapted_arguments() const;
// Garbage collection support.
virtual void Iterate(ObjectVisitor* v) const;
// Printing support.
virtual void Print(StringStream* accumulator,
PrintMode mode,
int index) const;
// Determine the code for the frame.
virtual Code* unchecked_code() const;
static JavaScriptFrame* cast(StackFrame* frame) {
ASSERT(frame->is_java_script());
return static_cast<JavaScriptFrame*>(frame);
}
protected:
explicit JavaScriptFrame(StackFrameIterator* iterator)
: StandardFrame(iterator) { }
virtual Address GetCallerStackPointer() const;
private:
inline Object* function_slot_object() const;
friend class StackFrameIterator;
friend class StackTracer;
};
// Arguments adaptor frames are automatically inserted below
// JavaScript frames when the actual number of parameters does not
// match the formal number of parameters.
class ArgumentsAdaptorFrame: public JavaScriptFrame {
public:
virtual Type type() const { return ARGUMENTS_ADAPTOR; }
// Determine the code for the frame.
virtual Code* unchecked_code() const;
static ArgumentsAdaptorFrame* cast(StackFrame* frame) {
ASSERT(frame->is_arguments_adaptor());
return static_cast<ArgumentsAdaptorFrame*>(frame);
}
// Printing support.
virtual void Print(StringStream* accumulator,
PrintMode mode,
int index) const;
protected:
explicit ArgumentsAdaptorFrame(StackFrameIterator* iterator)
: JavaScriptFrame(iterator) { }
virtual Address GetCallerStackPointer() const;
private:
friend class StackFrameIterator;
};
class InternalFrame: public StandardFrame {
public:
virtual Type type() const { return INTERNAL; }
// Garbage collection support.
virtual void Iterate(ObjectVisitor* v) const;
// Determine the code for the frame.
virtual Code* unchecked_code() const;
static InternalFrame* cast(StackFrame* frame) {
ASSERT(frame->is_internal());
return static_cast<InternalFrame*>(frame);
}
protected:
explicit InternalFrame(StackFrameIterator* iterator)
: StandardFrame(iterator) { }
virtual Address GetCallerStackPointer() const;
private:
friend class StackFrameIterator;
};
// Construct frames are special trampoline frames introduced to handle
// function invocations through 'new'.
class ConstructFrame: public InternalFrame {
public:
virtual Type type() const { return CONSTRUCT; }
static ConstructFrame* cast(StackFrame* frame) {
ASSERT(frame->is_construct());
return static_cast<ConstructFrame*>(frame);
}
protected:
explicit ConstructFrame(StackFrameIterator* iterator)
: InternalFrame(iterator) { }
private:
friend class StackFrameIterator;
};
class StackFrameIterator BASE_EMBEDDED {
public:
// An iterator that iterates over the current thread's stack.
StackFrameIterator();
// An iterator that iterates over a given thread's stack.
explicit StackFrameIterator(ThreadLocalTop* thread);
// An iterator that can start from a given FP address.
// If use_top, then work as usual, if fp isn't NULL, use it,
// otherwise, do nothing.
StackFrameIterator(bool use_top, Address fp, Address sp);
StackFrame* frame() const {
ASSERT(!done());
return frame_;
}
bool done() const { return frame_ == NULL; }
void Advance() { (this->*advance_)(); }
// Go back to the first frame.
void Reset();
private:
#define DECLARE_SINGLETON(ignore, type) type type##_;
STACK_FRAME_TYPE_LIST(DECLARE_SINGLETON)
#undef DECLARE_SINGLETON
StackFrame* frame_;
StackHandler* handler_;
ThreadLocalTop* thread_;
Address fp_;
Address sp_;
void (StackFrameIterator::*advance_)();
StackHandler* handler() const {
ASSERT(!done());
return handler_;
}
// Get the type-specific frame singleton in a given state.
StackFrame* SingletonFor(StackFrame::Type type, StackFrame::State* state);
// A helper function, can return a NULL pointer.
StackFrame* SingletonFor(StackFrame::Type type);
void AdvanceWithHandler();
void AdvanceWithoutHandler();
friend class StackFrame;
friend class SafeStackFrameIterator;
DISALLOW_COPY_AND_ASSIGN(StackFrameIterator);
};
// Iterator that supports iterating through all JavaScript frames.
template<typename Iterator>
class JavaScriptFrameIteratorTemp BASE_EMBEDDED {
public:
JavaScriptFrameIteratorTemp() { if (!done()) Advance(); }
explicit JavaScriptFrameIteratorTemp(ThreadLocalTop* thread) :
iterator_(thread) {
if (!done()) Advance();
}
// Skip frames until the frame with the given id is reached.
explicit JavaScriptFrameIteratorTemp(StackFrame::Id id);
JavaScriptFrameIteratorTemp(Address fp, Address sp,
Address low_bound, Address high_bound) :
iterator_(fp, sp, low_bound, high_bound) {
if (!done()) Advance();
}
inline JavaScriptFrame* frame() const;
bool done() const { return iterator_.done(); }
void Advance();
// Advance to the frame holding the arguments for the current
// frame. This only affects the current frame if it has adapted
// arguments.
void AdvanceToArgumentsFrame();
// Go back to the first frame.
void Reset();
private:
Iterator iterator_;
};
typedef JavaScriptFrameIteratorTemp<StackFrameIterator> JavaScriptFrameIterator;
// NOTE: The stack trace frame iterator is an iterator that only
// traverse proper JavaScript frames; that is JavaScript frames that
// have proper JavaScript functions. This excludes the problematic
// functions in runtime.js.
class StackTraceFrameIterator: public JavaScriptFrameIterator {
public:
StackTraceFrameIterator();
void Advance();
private:
bool IsValidFrame();
};
class SafeStackFrameIterator BASE_EMBEDDED {
public:
SafeStackFrameIterator(Address fp, Address sp,
Address low_bound, Address high_bound);
StackFrame* frame() const {
ASSERT(is_working_iterator_);
return iterator_.frame();
}
bool done() const { return iteration_done_ ? true : iterator_.done(); }
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;
}
private:
class StackAddressValidator {
public:
StackAddressValidator(Address low_bound, Address high_bound)
: low_bound_(low_bound), high_bound_(high_bound) { }
bool IsValid(Address addr) const {
return IsWithinBounds(low_bound_, high_bound_, addr);
}
private:
Address low_bound_;
Address high_bound_;
};
class ExitFrameValidator {
public:
explicit ExitFrameValidator(const StackAddressValidator& validator)
: validator_(validator) { }
ExitFrameValidator(Address low_bound, Address high_bound)
: validator_(low_bound, high_bound) { }
bool IsValidFP(Address fp);
private:
StackAddressValidator validator_;
};
bool IsValidStackAddress(Address addr) const {
return stack_validator_.IsValid(addr);
}
bool CanIterateHandles(StackFrame* frame, StackHandler* handler);
bool IsValidFrame(StackFrame* frame) const;
bool IsValidCaller(StackFrame* frame);
static bool IsValidTop(Address low_bound, Address high_bound);
// 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_;
StackAddressValidator stack_validator_;
const bool is_valid_top_;
const bool is_valid_fp_;
const bool is_working_iterator_;
bool iteration_done_;
StackFrameIterator iterator_;
};
#ifdef ENABLE_LOGGING_AND_PROFILING
typedef JavaScriptFrameIteratorTemp<SafeStackFrameIterator>
SafeJavaScriptFrameIterator;
class SafeStackTraceFrameIterator: public SafeJavaScriptFrameIterator {
public:
explicit SafeStackTraceFrameIterator(Address fp, Address sp,
Address low_bound, Address high_bound);
void Advance();
};
#endif
class StackFrameLocator BASE_EMBEDDED {
public:
// Find the nth JavaScript frame on the stack. The caller must
// guarantee that such a frame exists.
JavaScriptFrame* FindJavaScriptFrame(int n);
private:
StackFrameIterator iterator_;
};
// Reads all frames on the current stack and copies them into the current
// zone memory.
Vector<StackFrame*> CreateStackMap();
} } // namespace v8::internal
#endif // V8_FRAMES_H_