Changeset 60075 in webkit for trunk/JavaScriptCore/runtime/JSFunction.cpp

Timestamp:

May 24, 2010, 11:46:49 AM (15 years ago)

Author:

[email protected]

Message:

​https://bugs.webkit.org/show_bug.cgi?id=39583
Move creation of 'this' object from caller to callee in construction.

Reviewed by Sam Weinig.

Presently the caller of a constructor is responsible for providing a this
object. Instead, move the object creation into a new op_create_this opcode,
planted in the head of the contructor bytecode for a function. Since the
prototype for the object is provided by performing a get_by_id on the callee,
also add a new get_callee opcode (this is used to get the callee JSFunction
into a register so that a normal get_by_id can be used).

Currently the caller is also responsible for detecting when op_construct is
performed on a JSFunction representing a host function, in which case an
exception is thrown – and this check currently takes place when constructing
the this object. Instead, mirroring the recent changes for non-host functions,
add a parallel code-path for native constructors to follow, with a thunk for
invoking native constructors provided by JITStubs, and a constructor-specific
NativeFunction on NativeExecutable. Provide an implementation of a host
constructor which will throw an exception.

• bytecode/CodeBlock.cpp:

(JSC::CodeBlock::dump):
(JSC::CodeBlock::getByIdExceptionInfoForBytecodeOffset):

• bytecode/CodeBlock.h:
• bytecode/Opcode.h:
• bytecompiler/BytecodeGenerator.cpp:

(JSC::BytecodeGenerator::BytecodeGenerator):
(JSC::BytecodeGenerator::emitConstruct):

• bytecompiler/BytecodeGenerator.h:

(JSC::BytecodeGenerator::emitGetByIdExceptionInfo):

• interpreter/Interpreter.cpp:

(JSC::Interpreter::privateExecute):

• jit/JIT.cpp:

(JSC::JIT::privateCompileMainPass):

• jit/JIT.h:
• jit/JITCall.cpp:

(JSC::JIT::compileOpCall):
(JSC::JIT::compileOpCallSlowCase):

• jit/JITCall32_64.cpp:

(JSC::JIT::compileOpCall):
(JSC::JIT::compileOpCallSlowCase):

• jit/JITOpcodes.cpp:

(JSC::JIT::privateCompileCTIMachineTrampolines):
(JSC::JIT::privateCompileCTINativeCall):
(JSC::JIT::emit_op_neq_null):
(JSC::JIT::emit_op_convert_this):
(JSC::JIT::emit_op_get_callee):
(JSC::JIT::emit_op_create_this):

• jit/JITOpcodes32_64.cpp:

(JSC::JIT::privateCompileCTIMachineTrampolines):
(JSC::JIT::privateCompileCTINativeCall):
(JSC::JIT::emit_op_get_callee):
(JSC::JIT::emit_op_create_this):

• jit/JITStubs.cpp:

(JSC::DEFINE_STUB_FUNCTION):
(JSC::JITThunks::hostFunctionStub):

• jit/JITStubs.h:

(JSC::JITThunks::ctiNativeConstruct):
(JSC::):

• runtime/ExceptionHelpers.cpp:

(JSC::createNotAnObjectError):

• runtime/Executable.h:

(JSC::NativeExecutable::create):
(JSC::NativeExecutable::NativeExecutable):

• runtime/JSFunction.cpp:

(JSC::callHostFunctionAsConstructor):

• runtime/JSFunction.h:

File:

• trunk/JavaScriptCore/runtime/JSFunction.cpp (modified) (2 diffs)

trunk/JavaScriptCore/runtime/JSFunction.cpp

@@ -29 +29 @@
 #include "CommonIdentifiers.h"
 #include "CallFrame.h"
+#include "ExceptionHelpers.h"
 #include "FunctionPrototype.h"
 #include "JSGlobalObject.h"
@@ -41 +42 @@
 
 namespace JSC {
+
+JSValue JSC_HOST_CALL callHostFunctionAsConstructor(ExecState* exec, JSObject* constructor, JSValue, const ArgList&)
+{
+    CodeBlock* codeBlock = exec->callerFrame()->codeBlock();
+    unsigned vPCIndex = codeBlock->bytecodeOffset(exec, exec->returnPC());
+    exec->setException(createNotAConstructorError(exec, constructor, vPCIndex, codeBlock));
+    return JSValue();
+}
 
 ASSERT_CLASS_FITS_IN_CELL(JSFunction);