Changeset 175508 in webkit for trunk/Source/JavaScriptCore/jit/JITOpcodes.cpp

Timestamp:

Nov 3, 2014, 7:36:28 PM (11 years ago)

Author:

[email protected]

Message:

Add "get scope" byte code
​https://bugs.webkit.org/show_bug.cgi?id=138326

Reviewed by Mark Lam.

Added op_get_scope. Added implementations for the LLInt and baseline JIT.
Provided nop implementation for DFG and FTL. The new byte code is emitted
after op_enter for any function, program or eval. It is expected that the
DFG will be implemented such that unneeded op_get_scope would be eliminated
during DFG compilation.

• bytecode/BytecodeList.json:
• bytecode/BytecodeUseDef.h:

(JSC::computeUsesForBytecodeOffset):
(JSC::computeDefsForBytecodeOffset):
Added new op_get_scope bytecode.

• bytecompiler/BytecodeGenerator.cpp:

(JSC::BytecodeGenerator::BytecodeGenerator):
(JSC::BytecodeGenerator::emitGetScope):

• bytecompiler/BytecodeGenerator.h:

Emit new op_get_scope bytecode.

• dfg/DFGByteCodeParser.cpp:

(JSC::DFG::ByteCodeParser::parseBlock):

• dfg/DFGCapabilities.cpp:

(JSC::DFG::capabilityLevel):
Added framework for new op_get_scope bytecode.

• bytecode/CodeBlock.cpp:

(JSC::CodeBlock::dumpBytecode):

• jit/JIT.cpp:

(JSC::JIT::privateCompileMainPass):

• jit/JIT.h:
• jit/JITOpcodes.cpp:

(JSC::JIT::emit_op_get_scope):

• jit/JITOpcodes32_64.cpp:

(JSC::JIT::emit_op_get_scope):

• llint/LowLevelInterpreter32_64.asm:
• llint/LowLevelInterpreter64.asm:

Implementation of op_get_scope bytecode.

File:

• trunk/Source/JavaScriptCore/jit/JITOpcodes.cpp (modified) (1 diff)

trunk/Source/JavaScriptCore/jit/JITOpcodes.cpp

@@ -671 +671 @@
 }
 
+void JIT::emit_op_get_scope(Instruction* currentInstruction)
+{
+    int dst = currentInstruction[1].u.operand;
+    emitGetFromCallFrameHeaderPtr(JSStack::Callee, regT0);
+    loadPtr(Address(regT0, JSFunction::offsetOfScopeChain()), regT0);
+    emitStoreCell(dst, regT0);
+}
+
 void JIT::emit_op_create_arguments(Instruction* currentInstruction)
 {