Split globals.h into two parts, where only one depends on V8.

src/v8globals.h

+// Copyright 2010 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_V8GLOBALS_H_
+#define V8_V8GLOBALS_H_
+
+#include "globals.h"
+
+namespace v8 {
+namespace internal {
+
+// This file contains constants and global declarations related to the
+// V8 system.
+
+// Mask for the sign bit in a smi.
+const intptr_t kSmiSignMask = kIntptrSignBit;
+
+const int kObjectAlignmentBits = kPointerSizeLog2;
+const intptr_t kObjectAlignment = 1 << kObjectAlignmentBits;
+const intptr_t kObjectAlignmentMask = kObjectAlignment - 1;
+
+// Desired alignment for pointers.
+const intptr_t kPointerAlignment = (1 << kPointerSizeLog2);
+const intptr_t kPointerAlignmentMask = kPointerAlignment - 1;
+
+// Desired alignment for maps.
+#if V8_HOST_ARCH_64_BIT
+const intptr_t kMapAlignmentBits = kObjectAlignmentBits;
+#else
+const intptr_t kMapAlignmentBits = kObjectAlignmentBits + 3;
+#endif
+const intptr_t kMapAlignment = (1 << kMapAlignmentBits);
+const intptr_t kMapAlignmentMask = kMapAlignment - 1;
+
+// Desired alignment for generated code is 32 bytes (to improve cache line
+// utilization).
+const int kCodeAlignmentBits = 5;
+const intptr_t kCodeAlignment = 1 << kCodeAlignmentBits;
+const intptr_t kCodeAlignmentMask = kCodeAlignment - 1;
+
+// Tag information for Failure.
+const int kFailureTag = 3;
+const int kFailureTagSize = 2;
+const intptr_t kFailureTagMask = (1 << kFailureTagSize) - 1;
+
+
+// Zap-value: The value used for zapping dead objects.
+// Should be a recognizable hex value tagged as a heap object pointer.
+#ifdef V8_HOST_ARCH_64_BIT
+const Address kZapValue =
+    reinterpret_cast<Address>(V8_UINT64_C(0xdeadbeedbeadbeed));
+const Address kHandleZapValue =
+    reinterpret_cast<Address>(V8_UINT64_C(0x1baddead0baddead));
+const Address kFromSpaceZapValue =
+    reinterpret_cast<Address>(V8_UINT64_C(0x1beefdad0beefdad));
+const uint64_t kDebugZapValue = 0xbadbaddbbadbaddb;
+#else
+const Address kZapValue = reinterpret_cast<Address>(0xdeadbeed);
+const Address kHandleZapValue = reinterpret_cast<Address>(0xbaddead);
+const Address kFromSpaceZapValue = reinterpret_cast<Address>(0xbeefdad);
+const uint32_t kDebugZapValue = 0xbadbaddb;
+#endif
+
+
+// Number of bits to represent the page size for paged spaces. The value of 13
+// gives 8K bytes per page.
+const int kPageSizeBits = 13;
+
+// On Intel architecture, cache line size is 64 bytes.
+// On ARM it may be less (32 bytes), but as far this constant is
+// used for aligning data, it doesn't hurt to align on a greater value.
+const int kProcessorCacheLineSize = 64;
+
+// Constants relevant to double precision floating point numbers.
+
+// Quiet NaNs have bits 51 to 62 set, possibly the sign bit, and no
+// other bits set.
+const uint64_t kQuietNaNMask = static_cast<uint64_t>(0xfff) << 51;
+// If looking only at the top 32 bits, the QNaN mask is bits 19 to 30.
+const uint32_t kQuietNaNHighBitsMask = 0xfff << (51 - 32);
+
+
+// -----------------------------------------------------------------------------
+// Forward declarations for frequently used classes
+// (sorted alphabetically)
+
+class AccessorInfo;
+class Allocation;
+class Arguments;
+class Assembler;
+class AssertNoAllocation;
+class BreakableStatement;
+class Code;
+class CodeGenerator;
+class CodeStub;
+class Context;
+class Debug;
+class Debugger;
+class DebugInfo;
+class Descriptor;
+class DescriptorArray;
+class Expression;
+class ExternalReference;
+class FixedArray;
+class FunctionEntry;
+class FunctionLiteral;
+class FunctionTemplateInfo;
+class NumberDictionary;
+class StringDictionary;
+template <typename T> class Handle;
+class Heap;
+class HeapObject;
+class IC;
+class InterceptorInfo;
+class IterationStatement;
+class JSArray;
+class JSFunction;
+class JSObject;
+class LargeObjectSpace;
+class LookupResult;
+class MacroAssembler;
+class Map;
+class MapSpace;
+class MarkCompactCollector;
+class NewSpace;
+class NodeVisitor;
+class Object;
+class MaybeObject;
+class OldSpace;
+class Property;
+class Proxy;
+class RegExpNode;
+struct RegExpCompileData;
+class RegExpTree;
+class RegExpCompiler;
+class RegExpVisitor;
+class Scope;
+template<class Allocator = FreeStoreAllocationPolicy> class ScopeInfo;
+class SerializedScopeInfo;
+class Script;
+class Slot;
+class Smi;
+template <typename Config, class Allocator = FreeStoreAllocationPolicy>
+    class SplayTree;
+class Statement;
+class String;
+class Struct;
+class SwitchStatement;
+class AstVisitor;
+class Variable;
+class VariableProxy;
+class RelocInfo;
+class Deserializer;
+class MessageLocation;
+class ObjectGroup;
+class TickSample;
+class VirtualMemory;
+class Mutex;
+
+typedef bool (*WeakSlotCallback)(Object** pointer);
+
+// -----------------------------------------------------------------------------
+// Miscellaneous
+
+// NOTE: SpaceIterator depends on AllocationSpace enumeration values being
+// consecutive.
+enum AllocationSpace {
+  NEW_SPACE,            // Semispaces collected with copying collector.
+  OLD_POINTER_SPACE,    // May contain pointers to new space.
+  OLD_DATA_SPACE,       // Must not have pointers to new space.
+  CODE_SPACE,           // No pointers to new space, marked executable.
+  MAP_SPACE,            // Only and all map objects.
+  CELL_SPACE,           // Only and all cell objects.
+  LO_SPACE,             // Promoted large objects.
+
+  FIRST_SPACE = NEW_SPACE,
+  LAST_SPACE = LO_SPACE,
+  FIRST_PAGED_SPACE = OLD_POINTER_SPACE,
+  LAST_PAGED_SPACE = CELL_SPACE
+};
+const int kSpaceTagSize = 3;
+const int kSpaceTagMask = (1 << kSpaceTagSize) - 1;
+
+
+// A flag that indicates whether objects should be pretenured when
+// allocated (allocated directly into the old generation) or not
+// (allocated in the young generation if the object size and type
+// allows).
+enum PretenureFlag { NOT_TENURED, TENURED };
+
+enum GarbageCollector { SCAVENGER, MARK_COMPACTOR };
+
+enum Executability { NOT_EXECUTABLE, EXECUTABLE };
+
+enum VisitMode { VISIT_ALL, VISIT_ALL_IN_SCAVENGE, VISIT_ONLY_STRONG };
+
+// Flag indicating whether code is built into the VM (one of the natives files).
+enum NativesFlag { NOT_NATIVES_CODE, NATIVES_CODE };
+
+
+// A CodeDesc describes a buffer holding instructions and relocation
+// information. The instructions start at the beginning of the buffer
+// and grow forward, the relocation information starts at the end of
+// the buffer and grows backward.
+//
+//  |<--------------- buffer_size ---------------->|
+//  |<-- instr_size -->|        |<-- reloc_size -->|
+//  +==================+========+==================+
+//  |   instructions   |  free  |    reloc info    |
+//  +==================+========+==================+
+//  ^
+//  |
+//  buffer
+
+struct CodeDesc {
+  byte* buffer;
+  int buffer_size;
+  int instr_size;
+  int reloc_size;
+  Assembler* origin;
+};
+
+
+// Callback function on object slots, used for iterating heap object slots in
+// HeapObjects, global pointers to heap objects, etc. The callback allows the
+// callback function to change the value of the slot.
+typedef void (*ObjectSlotCallback)(HeapObject** pointer);
+
+
+// Callback function used for iterating objects in heap spaces,
+// for example, scanning heap objects.
+typedef int (*HeapObjectCallback)(HeapObject* obj);
+
+
+// Callback function used for checking constraints when copying/relocating
+// objects. Returns true if an object can be copied/relocated from its
+// old_addr to a new_addr.
+typedef bool (*ConstraintCallback)(Address new_addr, Address old_addr);
+
+
+// Callback function on inline caches, used for iterating over inline caches
+// in compiled code.
+typedef void (*InlineCacheCallback)(Code* code, Address ic);
+
+
+// State for inline cache call sites. Aliased as IC::State.
+enum InlineCacheState {
+  // Has never been executed.
+  UNINITIALIZED,
+  // Has been executed but monomorhic state has been delayed.
+  PREMONOMORPHIC,
+  // Has been executed and only one receiver type has been seen.
+  MONOMORPHIC,
+  // Like MONOMORPHIC but check failed due to prototype.
+  MONOMORPHIC_PROTOTYPE_FAILURE,
+  // Multiple receiver types have been seen.
+  MEGAMORPHIC,
+  // Special states for debug break or step in prepare stubs.
+  DEBUG_BREAK,
+  DEBUG_PREPARE_STEP_IN
+};
+
+
+enum InLoopFlag {
+  NOT_IN_LOOP,
+  IN_LOOP
+};
+
+
+enum CallFunctionFlags {
+  NO_CALL_FUNCTION_FLAGS = 0,
+  RECEIVER_MIGHT_BE_VALUE = 1 << 0  // Receiver might not be a JSObject.
+};
+
+
+enum InlineCacheHolderFlag {
+  OWN_MAP,  // For fast properties objects.
+  PROTOTYPE_MAP  // For slow properties objects (except GlobalObjects).
+};
+
+
+// Type of properties.
+// Order of properties is significant.
+// Must fit in the BitField PropertyDetails::TypeField.
+// A copy of this is in mirror-debugger.js.
+enum PropertyType {
+  NORMAL              = 0,  // only in slow mode
+  FIELD               = 1,  // only in fast mode
+  CONSTANT_FUNCTION   = 2,  // only in fast mode
+  CALLBACKS           = 3,
+  INTERCEPTOR         = 4,  // only in lookup results, not in descriptors.
+  MAP_TRANSITION      = 5,  // only in fast mode
+  CONSTANT_TRANSITION = 6,  // only in fast mode
+  NULL_DESCRIPTOR     = 7,  // only in fast mode
+  // All properties before MAP_TRANSITION are real.
+  FIRST_PHANTOM_PROPERTY_TYPE = MAP_TRANSITION,
+  // There are no IC stubs for NULL_DESCRIPTORS. Therefore,
+  // NULL_DESCRIPTOR can be used as the type flag for IC stubs for
+  // nonexistent properties.
+  NONEXISTENT = NULL_DESCRIPTOR
+};
+
+
+// Whether to remove map transitions and constant transitions from a
+// DescriptorArray.
+enum TransitionFlag {
+  REMOVE_TRANSITIONS,
+  KEEP_TRANSITIONS
+};
+
+
+// Union used for fast testing of specific double values.
+union DoubleRepresentation {
+  double  value;
+  int64_t bits;
+  DoubleRepresentation(double x) { value = x; }
+};
+
+
+// Union used for customized checking of the IEEE double types
+// inlined within v8 runtime, rather than going to the underlying
+// platform headers and libraries
+union IeeeDoubleLittleEndianArchType {
+  double d;
+  struct {
+    unsigned int man_low  :32;
+    unsigned int man_high :20;
+    unsigned int exp      :11;
+    unsigned int sign     :1;
+  } bits;
+};
+
+
+union IeeeDoubleBigEndianArchType {
+  double d;
+  struct {
+    unsigned int sign     :1;
+    unsigned int exp      :11;
+    unsigned int man_high :20;
+    unsigned int man_low  :32;
+  } bits;
+};
+
+
+// AccessorCallback
+struct AccessorDescriptor {
+  MaybeObject* (*getter)(Object* object, void* data);
+  MaybeObject* (*setter)(JSObject* object, Object* value, void* data);
+  void* data;
+};
+
+
+// Logging and profiling.
+// A StateTag represents a possible state of the VM.  When compiled with
+// ENABLE_VMSTATE_TRACKING, the logger maintains a stack of these.
+// Creating a VMState object enters a state by pushing on the stack, and
+// destroying a VMState object leaves a state by popping the current state
+// from the stack.
+
+#define STATE_TAG_LIST(V) \
+  V(JS)                   \
+  V(GC)                   \
+  V(COMPILER)             \
+  V(OTHER)                \
+  V(EXTERNAL)
+
+enum StateTag {
+#define DEF_STATE_TAG(name) name,
+  STATE_TAG_LIST(DEF_STATE_TAG)
+#undef DEF_STATE_TAG
+  // Pseudo-types.
+  state_tag_count
+};
+
+
+// -----------------------------------------------------------------------------
+// Macros
+
+// Testers for test.
+
+#define HAS_SMI_TAG(value) \
+  ((reinterpret_cast<intptr_t>(value) & kSmiTagMask) == kSmiTag)
+
+#define HAS_FAILURE_TAG(value) \
+  ((reinterpret_cast<intptr_t>(value) & kFailureTagMask) == kFailureTag)
+
+// OBJECT_POINTER_ALIGN returns the value aligned as a HeapObject pointer
+#define OBJECT_POINTER_ALIGN(value)                             \
+  (((value) + kObjectAlignmentMask) & ~kObjectAlignmentMask)
+
+// POINTER_SIZE_ALIGN returns the value aligned as a pointer.
+#define POINTER_SIZE_ALIGN(value)                               \
+  (((value) + kPointerAlignmentMask) & ~kPointerAlignmentMask)
+
+// MAP_POINTER_ALIGN returns the value aligned as a map pointer.
+#define MAP_POINTER_ALIGN(value)                                \
+  (((value) + kMapAlignmentMask) & ~kMapAlignmentMask)
+
+// CODE_POINTER_ALIGN returns the value aligned as a generated code segment.
+#define CODE_POINTER_ALIGN(value)                               \
+  (((value) + kCodeAlignmentMask) & ~kCodeAlignmentMask)
+
+// Support for tracking C++ memory allocation.  Insert TRACK_MEMORY("Fisk")
+// inside a C++ class and new and delete will be overloaded so logging is
+// performed.
+// This file (globals.h) is included before log.h, so we use direct calls to
+// the Logger rather than the LOG macro.
+#ifdef DEBUG
+#define TRACK_MEMORY(name) \
+  void* operator new(size_t size) { \
+    void* result = ::operator new(size); \
+    Logger::NewEvent(name, result, size); \
+    return result; \
+  } \
+  void operator delete(void* object) { \
+    Logger::DeleteEvent(name, object); \
+    ::operator delete(object); \
+  }
+#else
+#define TRACK_MEMORY(name)
+#endif
+
+
+// Feature flags bit positions. They are mostly based on the CPUID spec.
+// (We assign CPUID itself to one of the currently reserved bits --
+// feel free to change this if needed.)
+// On X86/X64, values below 32 are bits in EDX, values above 32 are bits in ECX.
+enum CpuFeature { SSE4_1 = 32 + 19,  // x86
+                  SSE3 = 32 + 0,     // x86
+                  SSE2 = 26,   // x86
+                  CMOV = 15,   // x86
+                  RDTSC = 4,   // x86
+                  CPUID = 10,  // x86
+                  VFP3 = 1,    // ARM
+                  ARMv7 = 2,   // ARM
+                  SAHF = 0};   // x86
+
+} }  // namespace v8::internal
+
+#endif  // V8_V8GLOBALS_H_