source: webkit/trunk/JavaScriptCore/bytecode/JumpTable.h@ 44897

Last change on this file since 44897 was 44711, checked in by [email protected], 16 years ago

2009-06-15 Gavin Barraclough <​[email protected]>

Reviewed by Sam Weinig.

Having moved most of their functionality into the RepatchBuffer class,
we can simplify the CodeLocation* classes.

The CodeLocation* classes are currently a tangle of templatey and friendly
badness, burried in the middle of AbstractMacroAssembler. Having moved
the ability to repatch out into RepatchBufer they are now do-nothing wrappers
on CodePtr (MacroAssemblerCodePtr), that only exist to provide type-safety.

Simplify the code, and move them off into their own header.

  • JavaScriptCore.xcodeproj/project.pbxproj:
  • assembler/AbstractMacroAssembler.h: (JSC::AbstractMacroAssembler::PatchBuffer::patch):
  • assembler/CodeLocation.h: Copied from assembler/AbstractMacroAssembler.h. (JSC::CodeLocationCommon::CodeLocationCommon): (JSC::CodeLocationInstruction::CodeLocationInstruction): (JSC::CodeLocationLabel::CodeLocationLabel): (JSC::CodeLocationJump::CodeLocationJump): (JSC::CodeLocationCall::CodeLocationCall): (JSC::CodeLocationNearCall::CodeLocationNearCall): (JSC::CodeLocationDataLabel32::CodeLocationDataLabel32): (JSC::CodeLocationDataLabelPtr::CodeLocationDataLabelPtr): (JSC::CodeLocationCommon::instructionAtOffset): (JSC::CodeLocationCommon::labelAtOffset): (JSC::CodeLocationCommon::jumpAtOffset): (JSC::CodeLocationCommon::callAtOffset): (JSC::CodeLocationCommon::nearCallAtOffset): (JSC::CodeLocationCommon::dataLabelPtrAtOffset): (JSC::CodeLocationCommon::dataLabel32AtOffset):
  • assembler/MacroAssemblerCodeRef.h: (JSC::MacroAssemblerCodePtr::operator!):
  • bytecode/CodeBlock.h: (JSC::getStructureStubInfoReturnLocation): (JSC::getCallLinkInfoReturnLocation): (JSC::getMethodCallLinkInfoReturnLocation):
  • bytecode/Instruction.h:
  • bytecode/JumpTable.h: (JSC::StringJumpTable::ctiForValue): (JSC::SimpleJumpTable::ctiForValue):
  • bytecode/StructureStubInfo.h:
  • bytecompiler/BytecodeGenerator.cpp: (JSC::BytecodeGenerator::emitCatch):
  • jit/JIT.cpp: (JSC::JIT::privateCompile):
  • jit/JITStubs.cpp: (JSC::JITStubs::DEFINE_STUB_FUNCTION): (JSC::JITStubs::getPolymorphicAccessStructureListSlot):
File size: 3.6 KB
Line 
1/*
2 * Copyright (C) 2008 Apple Inc. All rights reserved.
3 * Copyright (C) 2008 Cameron Zwarich <[email protected]>
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of
15 * its contributors may be used to endorse or promote products derived
16 * from this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
19 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
20 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
21 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
22 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
23 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
24 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
25 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 */
29
30#ifndef JumpTable_h
31#define JumpTable_h
32
33#include "MacroAssembler.h"
34#include "UString.h"
35#include <wtf/HashMap.h>
36#include <wtf/Vector.h>
37
38namespace JSC {
39
40 struct OffsetLocation {
41 int32_t branchOffset;
42#if ENABLE(JIT)
43 CodeLocationLabel ctiOffset;
44#endif
45 };
46
47 struct StringJumpTable {
48 typedef HashMap<RefPtr<UString::Rep>, OffsetLocation> StringOffsetTable;
49 StringOffsetTable offsetTable;
50#if ENABLE(JIT)
51 CodeLocationLabel ctiDefault; // FIXME: it should not be necessary to store this.
52#endif
53
54 inline int32_t offsetForValue(UString::Rep* value, int32_t defaultOffset)
55 {
56 StringOffsetTable::const_iterator end = offsetTable.end();
57 StringOffsetTable::const_iterator loc = offsetTable.find(value);
58 if (loc == end)
59 return defaultOffset;
60 return loc->second.branchOffset;
61 }
62
63#if ENABLE(JIT)
64 inline CodeLocationLabel ctiForValue(UString::Rep* value)
65 {
66 StringOffsetTable::const_iterator end = offsetTable.end();
67 StringOffsetTable::const_iterator loc = offsetTable.find(value);
68 if (loc == end)
69 return ctiDefault;
70 return loc->second.ctiOffset;
71 }
72#endif
73 };
74
75 struct SimpleJumpTable {
76 // FIXME: The two Vectors can be combind into one Vector<OffsetLocation>
77 Vector<int32_t> branchOffsets;
78 int32_t min;
79#if ENABLE(JIT)
80 Vector<CodeLocationLabel> ctiOffsets;
81 CodeLocationLabel ctiDefault;
82#endif
83
84 int32_t offsetForValue(int32_t value, int32_t defaultOffset);
85 void add(int32_t key, int32_t offset)
86 {
87 if (!branchOffsets[key])
88 branchOffsets[key] = offset;
89 }
90
91#if ENABLE(JIT)
92 inline CodeLocationLabel ctiForValue(int32_t value)
93 {
94 if (value >= min && static_cast<uint32_t>(value - min) < ctiOffsets.size())
95 return ctiOffsets[value - min];
96 return ctiDefault;
97 }
98#endif
99 };
100
101} // namespace JSC
102
103#endif // JumpTable_h
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