v8/src/v8memory.h
kmillikin@chromium.org e49d533b50 Reapply "Add a level of indirection to exception handler addresses."
Original commit message:

Add a level of indirection to exception handler addresses.

To support deoptimization of exception handlers, the handler address in the
stack is converted to a pair of code object and an index into a separate
table of code offsets.  The index part is invariant under deoptimization.
The index is packed into the handler state field so that handler size does
not change.

R=vegorov@chromium.org
BUG=
TEST=

Review URL: http://codereview.chromium.org/8538011

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@9977 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
2011-11-11 13:48:14 +00:00

87 lines
2.9 KiB
C++

// Copyright 2011 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_MEMORY_H_
#define V8_MEMORY_H_
namespace v8 {
namespace internal {
// Memory provides an interface to 'raw' memory. It encapsulates the casts
// that typically are needed when incompatible pointer types are used.
class Memory {
public:
static uint8_t& uint8_at(Address addr) {
return *reinterpret_cast<uint8_t*>(addr);
}
static uint16_t& uint16_at(Address addr) {
return *reinterpret_cast<uint16_t*>(addr);
}
static uint32_t& uint32_at(Address addr) {
return *reinterpret_cast<uint32_t*>(addr);
}
static int32_t& int32_at(Address addr) {
return *reinterpret_cast<int32_t*>(addr);
}
static uint64_t& uint64_at(Address addr) {
return *reinterpret_cast<uint64_t*>(addr);
}
static int& int_at(Address addr) {
return *reinterpret_cast<int*>(addr);
}
static unsigned& unsigned_at(Address addr) {
return *reinterpret_cast<unsigned*>(addr);
}
static double& double_at(Address addr) {
return *reinterpret_cast<double*>(addr);
}
static Address& Address_at(Address addr) {
return *reinterpret_cast<Address*>(addr);
}
static Object*& Object_at(Address addr) {
return *reinterpret_cast<Object**>(addr);
}
static Handle<Object>& Object_Handle_at(Address addr) {
return *reinterpret_cast<Handle<Object>*>(addr);
}
};
} } // namespace v8::internal
#endif // V8_MEMORY_H_