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Diffstat (limited to 'deps/v8/src/virtual-frame.h')
| -rw-r--r-- | deps/v8/src/virtual-frame.h | 206 |
1 files changed, 206 insertions, 0 deletions
diff --git a/deps/v8/src/virtual-frame.h b/deps/v8/src/virtual-frame.h new file mode 100644 index 0000000000..99b4f76723 --- /dev/null +++ b/deps/v8/src/virtual-frame.h @@ -0,0 +1,206 @@ +// Copyright 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_VIRTUAL_FRAME_H_ +#define V8_VIRTUAL_FRAME_H_ + +#include "macro-assembler.h" + +namespace v8 { namespace internal { + +// ------------------------------------------------------------------------- +// Virtual frame elements +// +// The internal elements of the virtual frames. There are several kinds of +// elements: +// * Invalid: elements that are uninitialized or not actually part +// of the virtual frame. They should not be read. +// * Memory: an element that resides in the actual frame. Its address is +// given by its position in the virtual frame. +// * Register: an element that resides in a register. +// * Constant: an element whose value is known at compile time. + +class FrameElement BASE_EMBEDDED { + public: + enum SyncFlag { + NOT_SYNCED, + SYNCED + }; + + // The default constructor creates an invalid frame element. + FrameElement() + : static_type_(), type_(INVALID), copied_(false), synced_(false) { + data_.reg_ = no_reg; + } + + // Factory function to construct an invalid frame element. + static FrameElement InvalidElement() { + FrameElement result; + return result; + } + + // Factory function to construct an in-memory frame element. + static FrameElement MemoryElement() { + FrameElement result(MEMORY, no_reg, SYNCED); + return result; + } + + // Factory function to construct an in-register frame element. + static FrameElement RegisterElement(Register reg, + SyncFlag is_synced, + StaticType static_type = StaticType()) { + return FrameElement(REGISTER, reg, is_synced, static_type); + } + + // Factory function to construct a frame element whose value is known at + // compile time. + static FrameElement ConstantElement(Handle<Object> value, + SyncFlag is_synced) { + FrameElement result(value, is_synced); + return result; + } + + bool is_synced() const { return synced_; } + + void set_sync() { + ASSERT(type() != MEMORY); + synced_ = true; + } + + void clear_sync() { + ASSERT(type() != MEMORY); + synced_ = false; + } + + bool is_valid() const { return type() != INVALID; } + bool is_memory() const { return type() == MEMORY; } + bool is_register() const { return type() == REGISTER; } + bool is_constant() const { return type() == CONSTANT; } + bool is_copy() const { return type() == COPY; } + + bool is_copied() const { return copied_; } + void set_copied() { copied_ = true; } + void clear_copied() { copied_ = false; } + + Register reg() const { + ASSERT(is_register()); + return data_.reg_; + } + + Handle<Object> handle() const { + ASSERT(is_constant()); + return Handle<Object>(data_.handle_); + } + + int index() const { + ASSERT(is_copy()); + return data_.index_; + } + + bool Equals(FrameElement other); + + StaticType static_type() { return static_type_; } + + void set_static_type(StaticType static_type) { + // TODO(lrn): If it's s copy, it would be better to update the real one, + // but we can't from here. The caller must handle this. + static_type_ = static_type; + } + + private: + enum Type { + INVALID, + MEMORY, + REGISTER, + CONSTANT, + COPY + }; + + Type type() const { return static_cast<Type>(type_); } + + StaticType static_type_; + + // The element's type. + byte type_; + + bool copied_; + + // The element's dirty-bit. The dirty bit can be cleared + // for non-memory elements to indicate that the element agrees with + // the value in memory in the actual frame. + bool synced_; + + union { + Register reg_; + Object** handle_; + int index_; + } data_; + + // Used to construct memory and register elements. + FrameElement(Type type, Register reg, SyncFlag is_synced) + : static_type_(), + type_(type), + copied_(false), + synced_(is_synced != NOT_SYNCED) { + data_.reg_ = reg; + } + + FrameElement(Type type, Register reg, SyncFlag is_synced, StaticType stype) + : static_type_(stype), + type_(type), + copied_(false), + synced_(is_synced != NOT_SYNCED) { + data_.reg_ = reg; + } + + // Used to construct constant elements. + FrameElement(Handle<Object> value, SyncFlag is_synced) + : static_type_(StaticType::TypeOf(*value)), + type_(CONSTANT), + copied_(false), + synced_(is_synced != NOT_SYNCED) { + data_.handle_ = value.location(); + } + + void set_index(int new_index) { + ASSERT(is_copy()); + data_.index_ = new_index; + } + + friend class VirtualFrame; +}; + + +} } // namespace v8::internal + +#ifdef ARM +#include "virtual-frame-arm.h" +#else // ia32 +#include "virtual-frame-ia32.h" +#endif + +#endif // V8_VIRTUAL_FRAME_H_ |