| /* |
| * Copyright (C) 2008 Apple Inc. All rights reserved. |
| * Copyright (C) 2008 Cameron Zwarich <cwzwarich@uwaterloo.ca> |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. 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. |
| * 3. Neither the name of Apple Computer, Inc. ("Apple") 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 APPLE AND ITS 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 APPLE OR ITS 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 JumpTable_h |
| #define JumpTable_h |
| |
| #include "MacroAssembler.h" |
| #include <wtf/HashMap.h> |
| #include <wtf/Vector.h> |
| #include <wtf/text/StringImpl.h> |
| |
| namespace JSC { |
| |
| struct OffsetLocation { |
| int32_t branchOffset; |
| #if ENABLE(JIT) |
| CodeLocationLabel ctiOffset; |
| #endif |
| }; |
| |
| struct StringJumpTable { |
| typedef HashMap<RefPtr<StringImpl>, OffsetLocation> StringOffsetTable; |
| StringOffsetTable offsetTable; |
| #if ENABLE(JIT) |
| CodeLocationLabel ctiDefault; // FIXME: it should not be necessary to store this. |
| #endif |
| |
| inline int32_t offsetForValue(StringImpl* value, int32_t defaultOffset) |
| { |
| StringOffsetTable::const_iterator end = offsetTable.end(); |
| StringOffsetTable::const_iterator loc = offsetTable.find(value); |
| if (loc == end) |
| return defaultOffset; |
| return loc->value.branchOffset; |
| } |
| |
| #if ENABLE(JIT) |
| inline CodeLocationLabel ctiForValue(StringImpl* value) |
| { |
| StringOffsetTable::const_iterator end = offsetTable.end(); |
| StringOffsetTable::const_iterator loc = offsetTable.find(value); |
| if (loc == end) |
| return ctiDefault; |
| return loc->value.ctiOffset; |
| } |
| #endif |
| }; |
| |
| struct SimpleJumpTable { |
| // FIXME: The two Vectors can be combind into one Vector<OffsetLocation> |
| Vector<int32_t> branchOffsets; |
| int32_t min; |
| #if ENABLE(JIT) |
| Vector<CodeLocationLabel> ctiOffsets; |
| CodeLocationLabel ctiDefault; |
| #endif |
| |
| int32_t offsetForValue(int32_t value, int32_t defaultOffset); |
| void add(int32_t key, int32_t offset) |
| { |
| if (!branchOffsets[key]) |
| branchOffsets[key] = offset; |
| } |
| |
| #if ENABLE(JIT) |
| inline CodeLocationLabel ctiForValue(int32_t value) |
| { |
| if (value >= min && static_cast<uint32_t>(value - min) < ctiOffsets.size()) |
| return ctiOffsets[value - min]; |
| return ctiDefault; |
| } |
| #endif |
| }; |
| |
| } // namespace JSC |
| |
| #endif // JumpTable_h |
