Merge 6168:6800 from bleeding_edge to experimental/gc branch.

src/assembler.h

 // Copyright (c) 1994-2006 Sun Microsystems Inc.
 // 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.
 //
@@ skipping 17 matching lines @@
 // NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 // SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 // The original source code covered by the above license above has been
 // modified significantly by Google Inc.
 // Copyright 2006-2009 the V8 project authors. All rights reserved.
 
 #ifndef V8_ASSEMBLER_H_
 #define V8_ASSEMBLER_H_
 
+#include "gdb-jit.h"
 #include "runtime.h"
 #include "top.h"
 #include "token.h"
 
 namespace v8 {
 namespace internal {
 
 
 // -----------------------------------------------------------------------------
 // Common double constants.
 
 class DoubleConstant: public AllStatic {
  public:
   static const double min_int;
   static const double one_half;
+  static const double minus_zero;
   static const double negative_infinity;
 };
 
 
 // -----------------------------------------------------------------------------
 // Labels represent pc locations; they are typically jump or call targets.
 // After declaration, a label can be freely used to denote known or (yet)
 // unknown pc location. Assembler::bind() is used to bind a label to the
 // current pc. A label can be bound only once.
 
@@ skipping 109 matching lines @@
   // in the relocation information. Two types of source positions are collected
   // "position" (RelocMode position) and "statement position" (RelocMode
   // statement_position). The "position" is collected at places in the source
   // code which are of interest when making stack traces to pin-point the source
   // location of a stack frame as close as possible. The "statement position" is
   // collected at the beginning at each statement, and is used to indicate
   // possible break locations. kNoPosition is used to indicate an
   // invalid/uninitialized position value.
   static const int kNoPosition = -1;
 
+  // This string is used to add padding comments to the reloc info in cases
+  // where we are not sure to have enough space for patching in during
+  // lazy deoptimization. This is the case if we have indirect calls for which
+  // we do not normally record relocation info.
+  static const char* kFillerCommentString;
+
   enum Mode {
     // Please note the order is important (see IsCodeTarget, IsGCRelocMode).
     CONSTRUCT_CALL,  // code target that is a call to a JavaScript constructor.
-    CODE_TARGET_CONTEXT,  // Code target used for contextual loads.
+    CODE_TARGET_CONTEXT,  // Code target used for contextual loads and stores.
     DEBUG_BREAK,  // Code target for the debugger statement.
     CODE_TARGET,  // Code target which is not any of the above.
     EMBEDDED_OBJECT,
-
     GLOBAL_PROPERTY_CELL,
 
     // Everything after runtime_entry (inclusive) is not GC'ed.
     RUNTIME_ENTRY,
     JS_RETURN,  // Marks start of the ExitJSFrame code.
     COMMENT,
     POSITION,  // See comment for kNoPosition above.
     STATEMENT_POSITION,  // See comment for kNoPosition above.
     DEBUG_BREAK_SLOT,  // Additional code inserted for debug break slot.
     EXTERNAL_REFERENCE,  // The address of an external C++ function.
     INTERNAL_REFERENCE,  // An address inside the same function.
 
     // add more as needed
     // Pseudo-types
     NUMBER_OF_MODES,  // must be no greater than 14 - see RelocInfoWriter
     NONE,  // never recorded
     LAST_CODE_ENUM = CODE_TARGET,
-    LAST_GCED_ENUM = EMBEDDED_OBJECT
+    LAST_GCED_ENUM = GLOBAL_PROPERTY_CELL
   };
 
 
   RelocInfo() {}
   RelocInfo(byte* pc, Mode rmode, intptr_t data)
       : pc_(pc), rmode_(rmode), data_(data) {
   }
 
   static inline bool IsConstructCall(Mode mode) {
     return mode == CONSTRUCT_CALL;
@@ skipping 236 matching lines @@
 // External function
 
 //----------------------------------------------------------------------------
 class IC_Utility;
 class SCTableReference;
 #ifdef ENABLE_DEBUGGER_SUPPORT
 class Debug_Address;
 #endif
 
 
-typedef void* ExternalReferenceRedirector(void* original, bool fp_return);
-
-
 // An ExternalReference represents a C++ address used in the generated
 // code. All references to C++ functions and variables must be encapsulated in
 // an ExternalReference instance. This is done in order to track the origin of
 // all external references in the code so that they can be bound to the correct
 // addresses when deserializing a heap.
 class ExternalReference BASE_EMBEDDED {
  public:
+  // Used in the simulator to support different native api calls.
+  //
+  // BUILTIN_CALL - builtin call.
+  // MaybeObject* f(v8::internal::Arguments).
+  //
+  // FP_RETURN_CALL - builtin call that returns floating point.
+  // double f(double, double).
+  //
+  // DIRECT_CALL - direct call to API function native callback
+  // from generated code.
+  // Handle<Value> f(v8::Arguments&)
+  //
+  enum Type {
+    BUILTIN_CALL,  // default
+    FP_RETURN_CALL,
+    DIRECT_CALL
+  };
+
+  typedef void* ExternalReferenceRedirector(void* original, Type type);
+
   explicit ExternalReference(Builtins::CFunctionId id);
 
-  explicit ExternalReference(ApiFunction* ptr);
+  explicit ExternalReference(ApiFunction* ptr, Type type);
 
   explicit ExternalReference(Builtins::Name name);
 
   explicit ExternalReference(Runtime::FunctionId id);
 
   explicit ExternalReference(Runtime::Function* f);
 
   explicit ExternalReference(const IC_Utility& ic_utility);
 
 #ifdef ENABLE_DEBUGGER_SUPPORT
@@ skipping 21 matching lines @@
   static ExternalReference compute_output_frames_function();
   static ExternalReference global_contexts_list();
 
   // Static data in the keyed lookup cache.
   static ExternalReference keyed_lookup_cache_keys();
   static ExternalReference keyed_lookup_cache_field_offsets();
 
   // Static variable Factory::the_hole_value.location()
   static ExternalReference the_hole_value_location();
 
+  // Static variable Factory::arguments_marker.location()
+  static ExternalReference arguments_marker_location();
+
   // Static variable Heap::roots_address()
   static ExternalReference roots_address();
 
   // Static variable StackGuard::address_of_jslimit()
   static ExternalReference address_of_stack_limit();
 
   // Static variable StackGuard::address_of_real_jslimit()
   static ExternalReference address_of_real_stack_limit();
 
   // Static variable RegExpStack::limit_address()
@@ skipping 23 matching lines @@
 
   static ExternalReference handle_scope_next_address();
   static ExternalReference handle_scope_limit_address();
   static ExternalReference handle_scope_level_address();
 
   static ExternalReference scheduled_exception_address();
 
   // Static variables containing common double constants.
   static ExternalReference address_of_min_int();
   static ExternalReference address_of_one_half();
+  static ExternalReference address_of_minus_zero();
   static ExternalReference address_of_negative_infinity();
 
   Address address() const {return reinterpret_cast<Address>(address_);}
 
 #ifdef ENABLE_DEBUGGER_SUPPORT
   // Function Debug::Break()
   static ExternalReference debug_break();
 
   // Used to check if single stepping is enabled in generated code.
   static ExternalReference debug_step_in_fp_address();
@@ skipping 22 matching lines @@
     ASSERT(redirector_ == NULL);  // We can't stack them.
     redirector_ = redirector;
   }
 
  private:
   explicit ExternalReference(void* address)
       : address_(address) {}
 
   static ExternalReferenceRedirector* redirector_;
 
-  static void* Redirect(void* address, bool fp_return = false) {
+  static void* Redirect(void* address,
+                        Type type = ExternalReference::BUILTIN_CALL) {
     if (redirector_ == NULL) return address;
-    void* answer = (*redirector_)(address, fp_return);
+    void* answer = (*redirector_)(address, type);
     return answer;
   }
 
-  static void* Redirect(Address address_arg, bool fp_return = false) {
+  static void* Redirect(Address address_arg,
+                        Type type = ExternalReference::BUILTIN_CALL) {
     void* address = reinterpret_cast<void*>(address_arg);
     void* answer = (redirector_ == NULL) ?
                    address :
-                   (*redirector_)(address, fp_return);
+                   (*redirector_)(address, type);
     return answer;
   }
 
   void* address_;
 };
 
 
 // -----------------------------------------------------------------------------
 // Position recording support
 
 struct PositionState {
   PositionState() : current_position(RelocInfo::kNoPosition),
                     written_position(RelocInfo::kNoPosition),
                     current_statement_position(RelocInfo::kNoPosition),
                     written_statement_position(RelocInfo::kNoPosition) {}
 
   int current_position;
   int written_position;
 
   int current_statement_position;
   int written_statement_position;
 };
 
 
 class PositionsRecorder BASE_EMBEDDED {
  public:
   explicit PositionsRecorder(Assembler* assembler)
-      : assembler_(assembler) {}
+      : assembler_(assembler) {
+#ifdef ENABLE_GDB_JIT_INTERFACE
+    gdbjit_lineinfo_ = NULL;
+#endif
+  }
+
+#ifdef ENABLE_GDB_JIT_INTERFACE
+  ~PositionsRecorder() {
+    delete gdbjit_lineinfo_;
+  }
+
+  void StartGDBJITLineInfoRecording() {
+    if (FLAG_gdbjit) {
+      gdbjit_lineinfo_ = new GDBJITLineInfo();
+    }
+  }
+
+  GDBJITLineInfo* DetachGDBJITLineInfo() {
+    GDBJITLineInfo* lineinfo = gdbjit_lineinfo_;
+    gdbjit_lineinfo_ = NULL;  // To prevent deallocation in destructor.
+    return lineinfo;
+  }
+#endif
 
   // Set current position to pos.
   void RecordPosition(int pos);
 
   // Set current statement position to pos.
   void RecordStatementPosition(int pos);
 
   // Write recorded positions to relocation information.
   bool WriteRecordedPositions();
 
   int current_position() const { return state_.current_position; }
 
   int current_statement_position() const {
     return state_.current_statement_position;
   }
 
  private:
   Assembler* assembler_;
   PositionState state_;
+#ifdef ENABLE_GDB_JIT_INTERFACE
+  GDBJITLineInfo* gdbjit_lineinfo_;
+#endif
 
   friend class PreservePositionScope;
 
   DISALLOW_COPY_AND_ASSIGN(PositionsRecorder);
 };
 
 
 class PreservePositionScope BASE_EMBEDDED {
  public:
   explicit PreservePositionScope(PositionsRecorder* positions_recorder)
@@ skipping 49 matching lines @@
   return num_bits_set;
 }
 
 // Computes pow(x, y) with the special cases in the spec for Math.pow.
 double power_double_int(double x, int y);
 double power_double_double(double x, double y);
 
 } }  // namespace v8::internal
 
 #endif  // V8_ASSEMBLER_H_