Move V8 to external/v8

Change-Id: If68025d67453785a651c5dfb34fad298c16676a4

1 files changed, 500 insertions, 0 deletions

diff --git a/src/assembler.h b/src/assembler.h
new file mode 100644
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--- /dev/null
+++ b/src/assembler.h
@@ -0,0 +1,500 @@
+// 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.
+//
+// - Redistribution 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 Sun Microsystems or the names of 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.
+
+// 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 "runtime.h"
+#include "top.h"
+#include "zone-inl.h"
+#include "token.h"
+
+namespace v8 {
+namespace internal {
+
+
+// -----------------------------------------------------------------------------
+// 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.
+
+class Label BASE_EMBEDDED {
+ public:
+  INLINE(Label())                 { Unuse(); }
+  INLINE(~Label())                { ASSERT(!is_linked()); }
+
+  INLINE(void Unuse())            { pos_ = 0; }
+
+  INLINE(bool is_bound()  const)  { return pos_ <  0; }
+  INLINE(bool is_unused() const)  { return pos_ == 0; }
+  INLINE(bool is_linked() const)  { return pos_ >  0; }
+
+  // Returns the position of bound or linked labels. Cannot be used
+  // for unused labels.
+  int pos() const;
+
+ private:
+  // pos_ encodes both the binding state (via its sign)
+  // and the binding position (via its value) of a label.
+  //
+  // pos_ <  0  bound label, pos() returns the jump target position
+  // pos_ == 0  unused label
+  // pos_ >  0  linked label, pos() returns the last reference position
+  int pos_;
+
+  void bind_to(int pos)  {
+    pos_ = -pos - 1;
+    ASSERT(is_bound());
+  }
+  void link_to(int pos)  {
+    pos_ =  pos + 1;
+    ASSERT(is_linked());
+  }
+
+  friend class Assembler;
+  friend class RegexpAssembler;
+  friend class Displacement;
+  friend class ShadowTarget;
+  friend class RegExpMacroAssemblerIrregexp;
+};
+
+
+// -----------------------------------------------------------------------------
+// Relocation information
+
+
+// Relocation information consists of the address (pc) of the datum
+// to which the relocation information applies, the relocation mode
+// (rmode), and an optional data field. The relocation mode may be
+// "descriptive" and not indicate a need for relocation, but simply
+// describe a property of the datum. Such rmodes are useful for GC
+// and nice disassembly output.
+
+class RelocInfo BASE_EMBEDDED {
+ public:
+  // The constant kNoPosition is used with the collecting of source positions
+  // 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;
+
+  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,         // code target which is not any of the above.
+    EMBEDDED_OBJECT,
+    EMBEDDED_STRING,
+
+    // 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.
+    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_STRING
+  };
+
+
+  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;
+  }
+  static inline bool IsCodeTarget(Mode mode) {
+    return mode <= LAST_CODE_ENUM;
+  }
+  // Is the relocation mode affected by GC?
+  static inline bool IsGCRelocMode(Mode mode) {
+    return mode <= LAST_GCED_ENUM;
+  }
+  static inline bool IsJSReturn(Mode mode) {
+    return mode == JS_RETURN;
+  }
+  static inline bool IsComment(Mode mode) {
+    return mode == COMMENT;
+  }
+  static inline bool IsPosition(Mode mode) {
+    return mode == POSITION || mode == STATEMENT_POSITION;
+  }
+  static inline bool IsStatementPosition(Mode mode) {
+    return mode == STATEMENT_POSITION;
+  }
+  static inline bool IsExternalReference(Mode mode) {
+    return mode == EXTERNAL_REFERENCE;
+  }
+  static inline bool IsInternalReference(Mode mode) {
+    return mode == INTERNAL_REFERENCE;
+  }
+  static inline int ModeMask(Mode mode) { return 1 << mode; }
+
+  // Accessors
+  byte* pc() const  { return pc_; }
+  void set_pc(byte* pc) { pc_ = pc; }
+  Mode rmode() const {  return rmode_; }
+  intptr_t data() const  { return data_; }
+
+  // Apply a relocation by delta bytes
+  INLINE(void apply(intptr_t delta));
+
+  // Read/modify the code target in the branch/call instruction
+  // this relocation applies to;
+  // can only be called if IsCodeTarget(rmode_) || rmode_ == RUNTIME_ENTRY
+  INLINE(Address target_address());
+  INLINE(void set_target_address(Address target));
+  INLINE(Object* target_object());
+  INLINE(Object** target_object_address());
+  INLINE(void set_target_object(Object* target));
+
+  // Read the address of the word containing the target_address. Can only
+  // be called if IsCodeTarget(rmode_) || rmode_ == RUNTIME_ENTRY.
+  INLINE(Address target_address_address());
+
+  // Read/modify the reference in the instruction this relocation
+  // applies to; can only be called if rmode_ is external_reference
+  INLINE(Address* target_reference_address());
+
+  // Read/modify the address of a call instruction. This is used to relocate
+  // the break points where straight-line code is patched with a call
+  // instruction.
+  INLINE(Address call_address());
+  INLINE(void set_call_address(Address target));
+  INLINE(Object* call_object());
+  INLINE(Object** call_object_address());
+  INLINE(void set_call_object(Object* target));
+
+  // Patch the code with some other code.
+  void PatchCode(byte* instructions, int instruction_count);
+
+  // Patch the code with a call.
+  void PatchCodeWithCall(Address target, int guard_bytes);
+  // Check whether the current instruction is currently a call
+  // sequence (whether naturally or a return sequence overwritten
+  // to enter the debugger).
+  INLINE(bool IsCallInstruction());
+
+#ifdef ENABLE_DISASSEMBLER
+  // Printing
+  static const char* RelocModeName(Mode rmode);
+  void Print();
+#endif  // ENABLE_DISASSEMBLER
+#ifdef DEBUG
+  // Debugging
+  void Verify();
+#endif
+
+  static const int kCodeTargetMask = (1 << (LAST_CODE_ENUM + 1)) - 1;
+  static const int kPositionMask = 1 << POSITION | 1 << STATEMENT_POSITION;
+  static const int kDebugMask = kPositionMask | 1 << COMMENT;
+  static const int kApplyMask;  // Modes affected by apply. Depends on arch.
+
+ private:
+  // On ARM, note that pc_ is the address of the constant pool entry
+  // to be relocated and not the address of the instruction
+  // referencing the constant pool entry (except when rmode_ ==
+  // comment).
+  byte* pc_;
+  Mode rmode_;
+  intptr_t data_;
+  friend class RelocIterator;
+};
+
+
+// RelocInfoWriter serializes a stream of relocation info. It writes towards
+// lower addresses.
+class RelocInfoWriter BASE_EMBEDDED {
+ public:
+  RelocInfoWriter() : pos_(NULL), last_pc_(NULL), last_data_(0) {}
+  RelocInfoWriter(byte* pos, byte* pc) : pos_(pos), last_pc_(pc),
+                                         last_data_(0) {}
+
+  byte* pos() const { return pos_; }
+  byte* last_pc() const { return last_pc_; }
+
+  void Write(const RelocInfo* rinfo);
+
+  // Update the state of the stream after reloc info buffer
+  // and/or code is moved while the stream is active.
+  void Reposition(byte* pos, byte* pc) {
+    pos_ = pos;
+    last_pc_ = pc;
+  }
+
+  // Max size (bytes) of a written RelocInfo. Longest encoding is
+  // ExtraTag, VariableLengthPCJump, ExtraTag, pc_delta, ExtraTag, data_delta.
+  // On ia32 and arm this is 1 + 4 + 1 + 1 + 1 + 4 = 12.
+  // On x64 this is 1 + 4 + 1 + 1 + 1 + 8 == 16;
+  // Here we use the maximum of the two.
+  static const int kMaxSize = 16;
+
+ private:
+  inline uint32_t WriteVariableLengthPCJump(uint32_t pc_delta);
+  inline void WriteTaggedPC(uint32_t pc_delta, int tag);
+  inline void WriteExtraTaggedPC(uint32_t pc_delta, int extra_tag);
+  inline void WriteExtraTaggedData(intptr_t data_delta, int top_tag);
+  inline void WriteTaggedData(intptr_t data_delta, int tag);
+  inline void WriteExtraTag(int extra_tag, int top_tag);
+
+  byte* pos_;
+  byte* last_pc_;
+  intptr_t last_data_;
+  DISALLOW_COPY_AND_ASSIGN(RelocInfoWriter);
+};
+
+
+// A RelocIterator iterates over relocation information.
+// Typical use:
+//
+//   for (RelocIterator it(code); !it.done(); it.next()) {
+//     // do something with it.rinfo() here
+//   }
+//
+// A mask can be specified to skip unwanted modes.
+class RelocIterator: public Malloced {
+ public:
+  // Create a new iterator positioned at
+  // the beginning of the reloc info.
+  // Relocation information with mode k is included in the
+  // iteration iff bit k of mode_mask is set.
+  explicit RelocIterator(Code* code, int mode_mask = -1);
+  explicit RelocIterator(const CodeDesc& desc, int mode_mask = -1);
+
+  // Iteration
+  bool done() const  { return done_; }
+  void next();
+
+  // Return pointer valid until next next().
+  RelocInfo* rinfo() {
+    ASSERT(!done());
+    return &rinfo_;
+  }
+
+ private:
+  // Advance* moves the position before/after reading.
+  // *Read* reads from current byte(s) into rinfo_.
+  // *Get* just reads and returns info on current byte.
+  void Advance(int bytes = 1) { pos_ -= bytes; }
+  int AdvanceGetTag();
+  int GetExtraTag();
+  int GetTopTag();
+  void ReadTaggedPC();
+  void AdvanceReadPC();
+  void AdvanceReadData();
+  void AdvanceReadVariableLengthPCJump();
+  int GetPositionTypeTag();
+  void ReadTaggedData();
+
+  static RelocInfo::Mode DebugInfoModeFromTag(int tag);
+
+  // If the given mode is wanted, set it in rinfo_ and return true.
+  // Else return false. Used for efficiently skipping unwanted modes.
+  bool SetMode(RelocInfo::Mode mode) {
+    return (mode_mask_ & 1 << mode) ? (rinfo_.rmode_ = mode, true) : false;
+  }
+
+  byte* pos_;
+  byte* end_;
+  RelocInfo rinfo_;
+  bool done_;
+  int mode_mask_;
+  DISALLOW_COPY_AND_ASSIGN(RelocIterator);
+};
+
+
+//------------------------------------------------------------------------------
+// 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:
+  explicit ExternalReference(Builtins::CFunctionId id);
+
+  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
+  explicit ExternalReference(const Debug_Address& debug_address);
+#endif
+
+  explicit ExternalReference(StatsCounter* counter);
+
+  explicit ExternalReference(Top::AddressId id);
+
+  explicit ExternalReference(const SCTableReference& table_ref);
+
+  // One-of-a-kind references. These references are not part of a general
+  // pattern. This means that they have to be added to the
+  // ExternalReferenceTable in serialize.cc manually.
+
+  static ExternalReference perform_gc_function();
+  static ExternalReference builtin_passed_function();
+  static ExternalReference random_positive_smi_function();
+
+  // Static variable Factory::the_hole_value.location()
+  static ExternalReference the_hole_value_location();
+
+  // Static variable Heap::roots_address()
+  static ExternalReference roots_address();
+
+  // Static variable StackGuard::address_of_jslimit()
+  static ExternalReference address_of_stack_guard_limit();
+
+  // Static variable RegExpStack::limit_address()
+  static ExternalReference address_of_regexp_stack_limit();
+
+  // Static variable Heap::NewSpaceStart()
+  static ExternalReference new_space_start();
+  static ExternalReference heap_always_allocate_scope_depth();
+
+  // Used for fast allocation in generated code.
+  static ExternalReference new_space_allocation_top_address();
+  static ExternalReference new_space_allocation_limit_address();
+
+  static ExternalReference double_fp_operation(Token::Value operation);
+  static ExternalReference compare_doubles();
+
+  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();
+#endif
+
+#ifdef V8_NATIVE_REGEXP
+  // C functions called from RegExp generated code.
+
+  // Function NativeRegExpMacroAssembler::CaseInsensitiveCompareUC16()
+  static ExternalReference re_case_insensitive_compare_uc16();
+
+  // Function RegExpMacroAssembler*::CheckStackGuardState()
+  static ExternalReference re_check_stack_guard_state();
+
+  // Function NativeRegExpMacroAssembler::GrowStack()
+  static ExternalReference re_grow_stack();
+#endif
+
+  // This lets you register a function that rewrites all external references.
+  // Used by the ARM simulator to catch calls to external references.
+  static void set_redirector(ExternalReferenceRedirector* redirector) {
+    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) {
+    if (redirector_ == NULL) return address;
+    return (*redirector_)(address, fp_return);
+  }
+
+  static void* Redirect(Address address_arg, bool fp_return = false) {
+    void* address = reinterpret_cast<void*>(address_arg);
+    return redirector_ == NULL ? address : (*redirector_)(address, fp_return);
+  }
+
+  void* address_;
+};
+
+
+// -----------------------------------------------------------------------------
+// Utility functions
+
+static inline bool is_intn(int x, int n)  {
+  return -(1 << (n-1)) <= x && x < (1 << (n-1));
+}
+
+static inline bool is_int24(int x)  { return is_intn(x, 24); }
+static inline bool is_int8(int x)  { return is_intn(x, 8); }
+
+static inline bool is_uintn(int x, int n) {
+  return (x & -(1 << n)) == 0;
+}
+
+static inline bool is_uint2(int x)  { return is_uintn(x, 2); }
+static inline bool is_uint3(int x)  { return is_uintn(x, 3); }
+static inline bool is_uint4(int x)  { return is_uintn(x, 4); }
+static inline bool is_uint5(int x)  { return is_uintn(x, 5); }
+static inline bool is_uint6(int x)  { return is_uintn(x, 6); }
+static inline bool is_uint8(int x)  { return is_uintn(x, 8); }
+static inline bool is_uint12(int x)  { return is_uintn(x, 12); }
+static inline bool is_uint16(int x)  { return is_uintn(x, 16); }
+static inline bool is_uint24(int x)  { return is_uintn(x, 24); }
+
+} }  // namespace v8::internal
+
+#endif  // V8_ASSEMBLER_H_