From 1bf1084f2b10c3b47fd1a588d85d21ed0eb41d0c Mon Sep 17 00:00:00 2001
From: Lorry Tar Creator <lorry-tar-importer@lorry>
Date: Tue, 27 Jun 2017 06:07:23 +0000
Subject: webkitgtk-2.16.5

---
 Source/JavaScriptCore/runtime/CodeCache.h | 195 +++++++++++++++---------------
 1 file changed, 97 insertions(+), 98 deletions(-)

(limited to 'Source/JavaScriptCore/runtime/CodeCache.h')

diff --git a/Source/JavaScriptCore/runtime/CodeCache.h b/Source/JavaScriptCore/runtime/CodeCache.h
index f3ff7478d..b4ab8e56c 100644
--- a/Source/JavaScriptCore/runtime/CodeCache.h
+++ b/Source/JavaScriptCore/runtime/CodeCache.h
@@ -23,96 +23,42 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#ifndef CodeCache_h
-#define CodeCache_h
+#pragma once
 
-#include "CodeSpecializationKind.h"
+#include "BytecodeGenerator.h"
+#include "ExecutableInfo.h"
+#include "JSCInlines.h"
+#include "Parser.h"
 #include "ParserModes.h"
-#include "SourceCode.h"
+#include "SourceCodeKey.h"
 #include "Strong.h"
-#include "WeakRandom.h"
+#include "StrongInlines.h"
+#include "UnlinkedCodeBlock.h"
+#include "UnlinkedEvalCodeBlock.h"
+#include "UnlinkedModuleProgramCodeBlock.h"
+#include "UnlinkedProgramCodeBlock.h"
+#include "UnlinkedSourceCode.h"
 #include <wtf/CurrentTime.h>
 #include <wtf/Forward.h>
-#include <wtf/PassOwnPtr.h>
-#include <wtf/RandomNumber.h>
 #include <wtf/text/WTFString.h>
 
 namespace JSC {
 
 class EvalExecutable;
-class FunctionBodyNode;
+class IndirectEvalExecutable;
 class Identifier;
-class JSScope;
+class DirectEvalExecutable;
+class ModuleProgramExecutable;
+class ParserError;
 class ProgramExecutable;
+class SourceCode;
 class UnlinkedCodeBlock;
 class UnlinkedEvalCodeBlock;
-class UnlinkedFunctionCodeBlock;
 class UnlinkedFunctionExecutable;
+class UnlinkedModuleProgramCodeBlock;
 class UnlinkedProgramCodeBlock;
 class VM;
-struct ParserError;
-class SourceCode;
-class SourceProvider;
-
-class SourceCodeKey {
-public:
-    enum CodeType { EvalType, ProgramType, FunctionType };
-
-    SourceCodeKey()
-    {
-    }
-
-    SourceCodeKey(const SourceCode& sourceCode, const String& name, CodeType codeType, JSParserStrictness jsParserStrictness)
-        : m_sourceCode(sourceCode)
-        , m_name(name)
-        , m_flags((codeType << 1) | jsParserStrictness)
-        , m_hash(string().impl()->hash())
-    {
-    }
-
-    SourceCodeKey(WTF::HashTableDeletedValueType)
-        : m_sourceCode(WTF::HashTableDeletedValue)
-    {
-    }
-
-    bool isHashTableDeletedValue() const { return m_sourceCode.isHashTableDeletedValue(); }
-
-    unsigned hash() const { return m_hash; }
-
-    size_t length() const { return m_sourceCode.length(); }
-
-    bool isNull() const { return m_sourceCode.isNull(); }
-
-    // To save memory, we compute our string on demand. It's expected that source
-    // providers cache their strings to make this efficient.
-    String string() const { return m_sourceCode.toString(); }
-
-    bool operator==(const SourceCodeKey& other) const
-    {
-        return m_hash == other.m_hash
-            && length() == other.length()
-            && m_flags == other.m_flags
-            && m_name == other.m_name
-            && string() == other.string();
-    }
-
-private:
-    SourceCode m_sourceCode;
-    String m_name;
-    unsigned m_flags;
-    unsigned m_hash;
-};
-
-struct SourceCodeKeyHash {
-    static unsigned hash(const SourceCodeKey& key) { return key.hash(); }
-    static bool equal(const SourceCodeKey& a, const SourceCodeKey& b) { return a == b; }
-    static const bool safeToCompareToEmptyOrDeleted = false;
-};
-
-struct SourceCodeKeyHashTraits : SimpleClassHashTraits<SourceCodeKey> {
-    static const bool hasIsEmptyValueFunction = true;
-    static bool isEmptyValue(const SourceCodeKey& sourceCodeKey) { return sourceCodeKey.isNull(); }
-};
+class VariableEnvironment;
 
 struct SourceCodeValue {
     SourceCodeValue()
@@ -131,7 +77,7 @@ struct SourceCodeValue {
 
 class CodeCacheMap {
 public:
-    typedef HashMap<SourceCodeKey, SourceCodeValue, SourceCodeKeyHash, SourceCodeKeyHashTraits> MapType;
+    typedef HashMap<SourceCodeKey, SourceCodeValue, SourceCodeKey::Hash, SourceCodeKey::HashTraits> MapType;
     typedef MapType::iterator iterator;
     typedef MapType::AddResult AddResult;
 
@@ -145,18 +91,15 @@ public:
     {
     }
 
-    AddResult add(const SourceCodeKey& key, const SourceCodeValue& value)
+    SourceCodeValue* findCacheAndUpdateAge(const SourceCodeKey& key)
     {
         prune();
 
-        AddResult addResult = m_map.add(key, value);
-        if (addResult.isNewEntry) {
-            m_size += key.length();
-            m_age += key.length();
-            return addResult;
-        }
+        iterator findResult = m_map.find(key);
+        if (findResult == m_map.end())
+            return nullptr;
 
-        int64_t age = m_age - addResult.iterator->value.age;
+        int64_t age = m_age - findResult->value.age;
         if (age > m_capacity) {
             // A requested object is older than the cache's capacity. We can
             // infer that requested objects are subject to high eviction probability,
@@ -171,7 +114,20 @@ public:
                 m_capacity = m_minCapacity;
         }
 
-        addResult.iterator->value.age = m_age;
+        findResult->value.age = m_age;
+        m_age += key.length();
+
+        return &findResult->value;
+    }
+
+    AddResult addCache(const SourceCodeKey& key, const SourceCodeValue& value)
+    {
+        prune();
+
+        AddResult addResult = m_map.add(key, value);
+        ASSERT(addResult.isNewEntry);
+
+        m_size += key.length();
         m_age += key.length();
         return addResult;
     }
@@ -233,30 +189,73 @@ private:
     int64_t m_age;
 };
 
-// Caches top-level code such as <script>, eval(), new Function, and JSEvaluateScript().
+// Caches top-level code such as <script>, window.eval(), new Function, and JSEvaluateScript().
 class CodeCache {
+    WTF_MAKE_FAST_ALLOCATED;
 public:
-    static PassOwnPtr<CodeCache> create() { return adoptPtr(new CodeCache); }
+    UnlinkedProgramCodeBlock* getUnlinkedProgramCodeBlock(VM&, ProgramExecutable*, const SourceCode&, JSParserStrictMode, DebuggerMode, ParserError&);
+    UnlinkedEvalCodeBlock* getUnlinkedEvalCodeBlock(VM&, IndirectEvalExecutable*, const SourceCode&, JSParserStrictMode, DebuggerMode, ParserError&, EvalContextType);
+    UnlinkedModuleProgramCodeBlock* getUnlinkedModuleProgramCodeBlock(VM&, ModuleProgramExecutable*, const SourceCode&, DebuggerMode, ParserError&);
+    UnlinkedFunctionExecutable* getUnlinkedGlobalFunctionExecutable(VM&, const Identifier&, const SourceCode&, DebuggerMode, ParserError&);
 
-    UnlinkedProgramCodeBlock* getProgramCodeBlock(VM&, ProgramExecutable*, const SourceCode&, JSParserStrictness, DebuggerMode, ProfilerMode, ParserError&);
-    UnlinkedEvalCodeBlock* getEvalCodeBlock(VM&, EvalExecutable*, const SourceCode&, JSParserStrictness, DebuggerMode, ProfilerMode, ParserError&);
-    UnlinkedFunctionExecutable* getFunctionExecutableFromGlobalCode(VM&, const Identifier&, const SourceCode&, ParserError&);
-    ~CodeCache();
-
-    void clear()
-    {
-        m_sourceCode.clear();
-    }
+    void clear() { m_sourceCode.clear(); }
 
 private:
-    CodeCache();
-
     template <class UnlinkedCodeBlockType, class ExecutableType> 
-    UnlinkedCodeBlockType* getGlobalCodeBlock(VM&, ExecutableType*, const SourceCode&, JSParserStrictness, DebuggerMode, ProfilerMode, ParserError&);
+    UnlinkedCodeBlockType* getUnlinkedGlobalCodeBlock(VM&, ExecutableType*, const SourceCode&, JSParserStrictMode, JSParserScriptMode, DebuggerMode, ParserError&, EvalContextType);
 
     CodeCacheMap m_sourceCode;
 };
 
+template <typename T> struct CacheTypes { };
+
+template <> struct CacheTypes<UnlinkedProgramCodeBlock> {
+    typedef JSC::ProgramNode RootNode;
+    static const SourceCodeType codeType = SourceCodeType::ProgramType;
+    static const SourceParseMode parseMode = SourceParseMode::ProgramMode;
+};
+
+template <> struct CacheTypes<UnlinkedEvalCodeBlock> {
+    typedef JSC::EvalNode RootNode;
+    static const SourceCodeType codeType = SourceCodeType::EvalType;
+    static const SourceParseMode parseMode = SourceParseMode::ProgramMode;
+};
+
+template <> struct CacheTypes<UnlinkedModuleProgramCodeBlock> {
+    typedef JSC::ModuleProgramNode RootNode;
+    static const SourceCodeType codeType = SourceCodeType::ModuleType;
+    static const SourceParseMode parseMode = SourceParseMode::ModuleEvaluateMode;
+};
+
+template <class UnlinkedCodeBlockType, class ExecutableType>
+UnlinkedCodeBlockType* generateUnlinkedCodeBlock(VM& vm, ExecutableType* executable, const SourceCode& source, JSParserStrictMode strictMode, JSParserScriptMode scriptMode, DebuggerMode debuggerMode, ParserError& error, EvalContextType evalContextType, const VariableEnvironment* variablesUnderTDZ)
+{
+    typedef typename CacheTypes<UnlinkedCodeBlockType>::RootNode RootNode;
+    DerivedContextType derivedContextType = executable->derivedContextType();
+    std::unique_ptr<RootNode> rootNode = parse<RootNode>(
+        &vm, source, Identifier(), JSParserBuiltinMode::NotBuiltin, strictMode, scriptMode, CacheTypes<UnlinkedCodeBlockType>::parseMode, SuperBinding::NotNeeded, error, nullptr, ConstructorKind::None, derivedContextType, evalContextType);
+    if (!rootNode)
+        return nullptr;
+
+    unsigned lineCount = rootNode->lastLine() - rootNode->firstLine();
+    unsigned startColumn = rootNode->startColumn() + 1;
+    bool endColumnIsOnStartLine = !lineCount;
+    unsigned unlinkedEndColumn = rootNode->endColumn();
+    unsigned endColumn = unlinkedEndColumn + (endColumnIsOnStartLine ? startColumn : 1);
+    unsigned arrowContextFeature = executable->isArrowFunctionContext() ? ArrowFunctionContextFeature : 0;
+    executable->recordParse(rootNode->features() | arrowContextFeature, rootNode->hasCapturedVariables(), rootNode->lastLine(), endColumn);
+
+    UnlinkedCodeBlockType* unlinkedCodeBlock = UnlinkedCodeBlockType::create(&vm, executable->executableInfo(), debuggerMode);
+    unlinkedCodeBlock->recordParse(rootNode->features(), rootNode->hasCapturedVariables(), lineCount, unlinkedEndColumn);
+    unlinkedCodeBlock->setSourceURLDirective(source.provider()->sourceURL());
+    unlinkedCodeBlock->setSourceMappingURLDirective(source.provider()->sourceMappingURL());
+
+    error = BytecodeGenerator::generate(vm, rootNode.get(), unlinkedCodeBlock, debuggerMode, variablesUnderTDZ);
+
+    if (error.isValid())
+        return nullptr;
+
+    return unlinkedCodeBlock;
 }
 
-#endif // CodeCache_h
+} // namespace JSC
-- 
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