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oliver@apple.com authored
https://bugs.webkit.org/show_bug.cgi?id=101127 Reviewed by Filip Pizlo. An exciting journey into the world of architecture in which our hero adds yet another layer to JSC codegeneration. This patch adds a marginally more compact form of bytecode that is free from any data specific to a given execution context, and that does store any data structures necessary for execution. To actually execute this UnlinkedBytecode we still need to instantiate a real CodeBlock, but this is a much faster linear time operation than any of the earlier parsing or code generation passes. As the unlinked code is context free we can then simply use a cache from source to unlinked code mapping to completely avoid all of the old parser overhead. The cache is currently very simple and memory heavy, using the complete source text as a key (rather than SourceCode or equivalent), and a random eviction policy. This seems to produce a substantial win when loading identical content in different contexts. * API/tests/testapi.c: (main): * CMakeLists.txt: * GNUmakefile.list.am: * JavaScriptCore.vcproj/JavaScriptCore/JavaScriptCore.vcproj: * JavaScriptCore.xcodeproj/project.pbxproj: * bytecode/CodeBlock.cpp: * bytecode/CodeBlock.h: Moved a number of fields, and a bunch of logic to UnlinkedCodeBlock.h/cpp * bytecode/Opcode.h: Added a global const init no op instruction needed to get correct behaviour without any associated semantics. * bytecode/UnlinkedCodeBlock.cpp: Added. * bytecode/UnlinkedCodeBlock.h: Added. A fairly shallow, GC allocated version of the old CodeBlock classes with a 32bit instruction size, and just metadata size tracking. * bytecompiler/BytecodeGenerator.cpp: * bytecompiler/BytecodeGenerator.h: Replace direct access to m_symbolTable with access through symbolTable(). ProgramCode no longer has a symbol table at all so some previously unconditional (and pointless) uses of symbolTable get null checks. A few other changes to deal with type changes due to us generating unlinked code (eg. pointer free, so profile indices rather than pointers). * dfg/DFGByteCodeParser.cpp: * dfg/DFGCapabilities.h: Support global_init_nop * interpreter/Interpreter.cpp: Now get the ProgramExecutable to initialise new global properties before starting execution. * jit/JIT.cpp: * jit/JITDriver.h: * jit/JITStubs.cpp: * llint/LLIntData.cpp: * llint/LLIntSlowPaths.cpp: * llint/LowLevelInterpreter.asm: * llint/LowLevelInterpreter32_64.asm: * llint/LowLevelInterpreter64.asm: Adding init_global_const_nop everywhere else * parser/Parser.h: * parser/ParserModes.h: Added. * parser/ParserTokens.h: Parser no longer needs a global object or callframe to function * runtime/CodeCache.cpp: Added. * runtime/CodeCache.h: Added. A simple, random eviction, Source->UnlinkedCode cache * runtime/Executable.cpp: * runtime/Executable.h: Executables now reference their unlinked counterparts, and request code specifically for the target global object. * runtime/JSGlobalData.cpp: * runtime/JSGlobalData.h: GlobalData now owns a CodeCache and a set of new structures for the unlinked code types. * runtime/JSGlobalObject.cpp: * runtime/JSGlobalObject.h: Utility functions used by executables to perform compilation * runtime/JSType.h: Add new JSTypes for unlinked code git-svn-id: http://svn.webkit.org/repository/webkit/trunk@133688 268f45cc-cd09-0410-ab3c-d52691b4dbfc
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