1/*
2 * Copyright (C) 2012, 2016 Apple Inc. All Rights Reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#include "config.h"
27#include "CodeCache.h"
28
29#include "IndirectEvalExecutable.h"
30#include <wtf/text/StringConcatenateNumbers.h>
31
32namespace JSC {
33
34const Seconds CodeCacheMap::workingSetTime = 10_s;
35
36void CodeCacheMap::pruneSlowCase()
37{
38 m_minCapacity = std::max(m_size - m_sizeAtLastPrune, static_cast<int64_t>(0));
39 m_sizeAtLastPrune = m_size;
40 m_timeAtLastPrune = MonotonicTime::now();
41
42 if (m_capacity < m_minCapacity)
43 m_capacity = m_minCapacity;
44
45 while (m_size > m_capacity || !canPruneQuickly()) {
46 MapType::iterator it = m_map.begin();
47
48 writeCodeBlock(*it->value.cell->vm(), it->key, it->value);
49
50 m_size -= it->key.length();
51 m_map.remove(it);
52 }
53}
54
55template <class UnlinkedCodeBlockType, class ExecutableType>
56UnlinkedCodeBlockType* CodeCache::getUnlinkedGlobalCodeBlock(VM& vm, ExecutableType* executable, const SourceCode& source, JSParserStrictMode strictMode, JSParserScriptMode scriptMode, OptionSet<CodeGenerationMode> codeGenerationMode, ParserError& error, EvalContextType evalContextType)
57{
58 DerivedContextType derivedContextType = executable->derivedContextType();
59 bool isArrowFunctionContext = executable->isArrowFunctionContext();
60 SourceCodeKey key(
61 source, String(), CacheTypes<UnlinkedCodeBlockType>::codeType, strictMode, scriptMode,
62 derivedContextType, evalContextType, isArrowFunctionContext, codeGenerationMode,
63 WTF::nullopt);
64 UnlinkedCodeBlockType* unlinkedCodeBlock = m_sourceCode.findCacheAndUpdateAge<UnlinkedCodeBlockType>(vm, key);
65 if (unlinkedCodeBlock && Options::useCodeCache()) {
66 unsigned lineCount = unlinkedCodeBlock->lineCount();
67 unsigned startColumn = unlinkedCodeBlock->startColumn() + source.startColumn().oneBasedInt();
68 bool endColumnIsOnStartLine = !lineCount;
69 unsigned endColumn = unlinkedCodeBlock->endColumn() + (endColumnIsOnStartLine ? startColumn : 1);
70 executable->recordParse(unlinkedCodeBlock->codeFeatures(), unlinkedCodeBlock->hasCapturedVariables(), source.firstLine().oneBasedInt() + lineCount, endColumn);
71 if (!unlinkedCodeBlock->sourceURLDirective().isNull())
72 source.provider()->setSourceURLDirective(unlinkedCodeBlock->sourceURLDirective());
73 if (!unlinkedCodeBlock->sourceMappingURLDirective().isNull())
74 source.provider()->setSourceMappingURLDirective(unlinkedCodeBlock->sourceMappingURLDirective());
75 return unlinkedCodeBlock;
76 }
77
78 VariableEnvironment variablesUnderTDZ;
79 unlinkedCodeBlock = generateUnlinkedCodeBlock<UnlinkedCodeBlockType, ExecutableType>(vm, executable, source, strictMode, scriptMode, codeGenerationMode, error, evalContextType, &variablesUnderTDZ);
80
81 if (unlinkedCodeBlock && Options::useCodeCache()) {
82 m_sourceCode.addCache(key, SourceCodeValue(vm, unlinkedCodeBlock, m_sourceCode.age()));
83
84 key.source().provider().cacheBytecode([&] {
85 return encodeCodeBlock(vm, key, unlinkedCodeBlock);
86 });
87 }
88
89 return unlinkedCodeBlock;
90}
91
92UnlinkedProgramCodeBlock* CodeCache::getUnlinkedProgramCodeBlock(VM& vm, ProgramExecutable* executable, const SourceCode& source, JSParserStrictMode strictMode, OptionSet<CodeGenerationMode> codeGenerationMode, ParserError& error)
93{
94 return getUnlinkedGlobalCodeBlock<UnlinkedProgramCodeBlock>(vm, executable, source, strictMode, JSParserScriptMode::Classic, codeGenerationMode, error, EvalContextType::None);
95}
96
97UnlinkedEvalCodeBlock* CodeCache::getUnlinkedEvalCodeBlock(VM& vm, IndirectEvalExecutable* executable, const SourceCode& source, JSParserStrictMode strictMode, OptionSet<CodeGenerationMode> codeGenerationMode, ParserError& error, EvalContextType evalContextType)
98{
99 return getUnlinkedGlobalCodeBlock<UnlinkedEvalCodeBlock>(vm, executable, source, strictMode, JSParserScriptMode::Classic, codeGenerationMode, error, evalContextType);
100}
101
102UnlinkedModuleProgramCodeBlock* CodeCache::getUnlinkedModuleProgramCodeBlock(VM& vm, ModuleProgramExecutable* executable, const SourceCode& source, OptionSet<CodeGenerationMode> codeGenerationMode, ParserError& error)
103{
104 return getUnlinkedGlobalCodeBlock<UnlinkedModuleProgramCodeBlock>(vm, executable, source, JSParserStrictMode::Strict, JSParserScriptMode::Module, codeGenerationMode, error, EvalContextType::None);
105}
106
107UnlinkedFunctionExecutable* CodeCache::getUnlinkedGlobalFunctionExecutable(VM& vm, const Identifier& name, const SourceCode& source, OptionSet<CodeGenerationMode> codeGenerationMode, Optional<int> functionConstructorParametersEndPosition, ParserError& error)
108{
109 bool isArrowFunctionContext = false;
110 SourceCodeKey key(
111 source, name.string(), SourceCodeType::FunctionType,
112 JSParserStrictMode::NotStrict,
113 JSParserScriptMode::Classic,
114 DerivedContextType::None,
115 EvalContextType::None,
116 isArrowFunctionContext,
117 codeGenerationMode,
118 functionConstructorParametersEndPosition);
119 UnlinkedFunctionExecutable* executable = m_sourceCode.findCacheAndUpdateAge<UnlinkedFunctionExecutable>(vm, key);
120 if (executable && Options::useCodeCache()) {
121 if (!executable->sourceURLDirective().isNull())
122 source.provider()->setSourceURLDirective(executable->sourceURLDirective());
123 if (!executable->sourceMappingURLDirective().isNull())
124 source.provider()->setSourceMappingURLDirective(executable->sourceMappingURLDirective());
125 return executable;
126 }
127
128 JSTextPosition positionBeforeLastNewline;
129 std::unique_ptr<ProgramNode> program = parseFunctionForFunctionConstructor(vm, source, error, &positionBeforeLastNewline, functionConstructorParametersEndPosition);
130 if (!program) {
131 RELEASE_ASSERT(error.isValid());
132 return nullptr;
133 }
134
135 // This function assumes an input string that would result in a single function declaration.
136 StatementNode* funcDecl = program->singleStatement();
137 if (UNLIKELY(!funcDecl)) {
138 JSToken token;
139 error = ParserError(ParserError::SyntaxError, ParserError::SyntaxErrorIrrecoverable, token, "Parser error", -1);
140 return nullptr;
141 }
142 ASSERT(funcDecl->isFuncDeclNode());
143
144 FunctionMetadataNode* metadata = static_cast<FuncDeclNode*>(funcDecl)->metadata();
145 ASSERT(metadata);
146 if (!metadata)
147 return nullptr;
148
149 metadata->overrideName(name);
150 metadata->setEndPosition(positionBeforeLastNewline);
151 // The Function constructor only has access to global variables, so no variables will be under TDZ unless they're
152 // in the global lexical environment, which we always TDZ check accesses from.
153 ConstructAbility constructAbility = constructAbilityForParseMode(metadata->parseMode());
154 UnlinkedFunctionExecutable* functionExecutable = UnlinkedFunctionExecutable::create(&vm, source, metadata, UnlinkedNormalFunction, constructAbility, JSParserScriptMode::Classic, WTF::nullopt, DerivedContextType::None);
155
156 if (!source.provider()->sourceURLDirective().isNull())
157 functionExecutable->setSourceURLDirective(source.provider()->sourceURLDirective());
158 if (!source.provider()->sourceMappingURLDirective().isNull())
159 functionExecutable->setSourceMappingURLDirective(source.provider()->sourceMappingURLDirective());
160
161 if (Options::useCodeCache())
162 m_sourceCode.addCache(key, SourceCodeValue(vm, functionExecutable, m_sourceCode.age()));
163 return functionExecutable;
164}
165
166void CodeCache::updateCache(const UnlinkedFunctionExecutable* executable, const SourceCode& parentSource, CodeSpecializationKind kind, const UnlinkedFunctionCodeBlock* codeBlock)
167{
168 parentSource.provider()->updateCache(executable, parentSource, kind, codeBlock);
169}
170
171void CodeCache::write(VM& vm)
172{
173 for (auto& it : m_sourceCode)
174 writeCodeBlock(vm, it.key, it.value);
175}
176
177void generateUnlinkedCodeBlockForFunctions(VM& vm, UnlinkedCodeBlock* unlinkedCodeBlock, const SourceCode& parentSource, OptionSet<CodeGenerationMode> codeGenerationMode, ParserError& error)
178{
179 auto generate = [&](UnlinkedFunctionExecutable* unlinkedExecutable, CodeSpecializationKind constructorKind) {
180 if (constructorKind == CodeForConstruct && SourceParseModeSet(SourceParseMode::AsyncArrowFunctionMode, SourceParseMode::AsyncMethodMode, SourceParseMode::AsyncFunctionMode).contains(unlinkedExecutable->parseMode()))
181 return;
182
183 SourceCode source = unlinkedExecutable->linkedSourceCode(parentSource);
184 UnlinkedFunctionCodeBlock* unlinkedFunctionCodeBlock = unlinkedExecutable->unlinkedCodeBlockFor(vm, source, constructorKind, codeGenerationMode, error, unlinkedExecutable->parseMode());
185 if (unlinkedFunctionCodeBlock)
186 generateUnlinkedCodeBlockForFunctions(vm, unlinkedFunctionCodeBlock, source, codeGenerationMode, error);
187 };
188
189 // FIXME: We should also generate CodeBlocks for CodeForConstruct
190 // https://bugs.webkit.org/show_bug.cgi?id=193823
191 for (unsigned i = 0; i < unlinkedCodeBlock->numberOfFunctionDecls(); i++)
192 generate(unlinkedCodeBlock->functionDecl(i), CodeForCall);
193 for (unsigned i = 0; i < unlinkedCodeBlock->numberOfFunctionExprs(); i++)
194 generate(unlinkedCodeBlock->functionExpr(i), CodeForCall);
195}
196
197void writeCodeBlock(VM& vm, const SourceCodeKey& key, const SourceCodeValue& value)
198{
199 UnlinkedCodeBlock* codeBlock = jsDynamicCast<UnlinkedCodeBlock*>(vm, value.cell.get());
200 if (!codeBlock)
201 return;
202
203 key.source().provider().commitCachedBytecode();
204}
205
206static SourceCodeKey sourceCodeKeyForSerializedBytecode(VM&, const SourceCode& sourceCode, SourceCodeType codeType, JSParserStrictMode strictMode, JSParserScriptMode scriptMode, OptionSet<CodeGenerationMode> codeGenerationMode)
207{
208 return SourceCodeKey(
209 sourceCode, String(), codeType, strictMode, scriptMode,
210 DerivedContextType::None, EvalContextType::None, false, codeGenerationMode,
211 WTF::nullopt);
212}
213
214SourceCodeKey sourceCodeKeyForSerializedProgram(VM& vm, const SourceCode& sourceCode)
215{
216 JSParserStrictMode strictMode = JSParserStrictMode::NotStrict;
217 JSParserScriptMode scriptMode = JSParserScriptMode::Classic;
218 return sourceCodeKeyForSerializedBytecode(vm, sourceCode, SourceCodeType::ProgramType, strictMode, scriptMode, { });
219}
220
221SourceCodeKey sourceCodeKeyForSerializedModule(VM& vm, const SourceCode& sourceCode)
222{
223 JSParserStrictMode strictMode = JSParserStrictMode::Strict;
224 JSParserScriptMode scriptMode = JSParserScriptMode::Module;
225 return sourceCodeKeyForSerializedBytecode(vm, sourceCode, SourceCodeType::ModuleType, strictMode, scriptMode, { });
226}
227
228Ref<CachedBytecode> serializeBytecode(VM& vm, UnlinkedCodeBlock* codeBlock, const SourceCode& source, SourceCodeType codeType, JSParserStrictMode strictMode, JSParserScriptMode scriptMode, OptionSet<CodeGenerationMode> codeGenerationMode)
229{
230 return encodeCodeBlock(vm,
231 sourceCodeKeyForSerializedBytecode(vm, source, codeType, strictMode, scriptMode, codeGenerationMode), codeBlock);
232}
233
234}
235