--- /dev/null
+/*
+ * Copyright (C) 2011, 2012 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef CommonSlowPaths_h
+#define CommonSlowPaths_h
+
+#include "CodeBlock.h"
+#include "CodeSpecializationKind.h"
+#include "ExceptionHelpers.h"
+#include "JSArray.h"
+
+namespace JSC {
+
+// The purpose of this namespace is to include slow paths that are shared
+// between the interpreter and baseline JIT. They are written to be agnostic
+// with respect to the slow-path calling convention, but they do rely on the
+// JS code being executed more-or-less directly from bytecode (so the call
+// frame layout is unmodified, making it potentially awkward to use these
+// from any optimizing JIT, like the DFG).
+
+namespace CommonSlowPaths {
+
+ALWAYS_INLINE ExecState* arityCheckFor(ExecState* exec, RegisterFile* registerFile, CodeSpecializationKind kind)
+{
+ JSFunction* callee = jsCast<JSFunction*>(exec->callee());
+ ASSERT(!callee->isHostFunction());
+ CodeBlock* newCodeBlock = &callee->jsExecutable()->generatedBytecodeFor(kind);
+ int argumentCountIncludingThis = exec->argumentCountIncludingThis();
+
+ // This ensures enough space for the worst case scenario of zero arguments passed by the caller.
+ if (!registerFile->grow(exec->registers() + newCodeBlock->numParameters() + newCodeBlock->m_numCalleeRegisters))
+ return 0;
+
+ ASSERT(argumentCountIncludingThis < newCodeBlock->numParameters());
+
+ // Too few arguments -- copy call frame and arguments, then fill in missing arguments with undefined.
+ size_t delta = newCodeBlock->numParameters() - argumentCountIncludingThis;
+ Register* src = exec->registers();
+ Register* dst = exec->registers() + delta;
+
+ int i;
+ int end = -ExecState::offsetFor(argumentCountIncludingThis);
+ for (i = -1; i >= end; --i)
+ dst[i] = src[i];
+
+ end -= delta;
+ for ( ; i >= end; --i)
+ dst[i] = jsUndefined();
+
+ ExecState* newExec = ExecState::create(dst);
+ ASSERT((void*)newExec <= registerFile->end());
+ return newExec;
+}
+
+ALWAYS_INLINE bool opInstanceOfSlow(ExecState* exec, JSValue value, JSValue baseVal, JSValue proto)
+{
+ ASSERT(!value.isCell() || !baseVal.isCell() || !proto.isCell()
+ || !value.isObject() || !baseVal.isObject() || !proto.isObject()
+ || !asObject(baseVal)->structure()->typeInfo().implementsDefaultHasInstance());
+
+
+ // ECMA-262 15.3.5.3:
+ // Throw an exception either if baseVal is not an object, or if it does not implement 'HasInstance' (i.e. is a function).
+ TypeInfo typeInfo(UnspecifiedType);
+ if (!baseVal.isObject() || !(typeInfo = asObject(baseVal)->structure()->typeInfo()).implementsHasInstance()) {
+ exec->globalData().exception = createInvalidParamError(exec, "instanceof", baseVal);
+ return false;
+ }
+ ASSERT(typeInfo.type() != UnspecifiedType);
+
+ if (!typeInfo.overridesHasInstance() && !value.isObject())
+ return false;
+
+ return asObject(baseVal)->methodTable()->hasInstance(asObject(baseVal), exec, value, proto);
+}
+
+inline bool opIn(ExecState* exec, JSValue propName, JSValue baseVal)
+{
+ if (!baseVal.isObject()) {
+ exec->globalData().exception = createInvalidParamError(exec, "in", baseVal);
+ return false;
+ }
+
+ JSObject* baseObj = asObject(baseVal);
+
+ uint32_t i;
+ if (propName.getUInt32(i))
+ return baseObj->hasProperty(exec, i);
+
+ Identifier property(exec, propName.toString(exec)->value(exec));
+ if (exec->globalData().exception)
+ return false;
+ return baseObj->hasProperty(exec, property);
+}
+
+ALWAYS_INLINE JSValue opResolve(ExecState* exec, Identifier& ident)
+{
+ ScopeChainNode* scopeChain = exec->scopeChain();
+
+ ScopeChainIterator iter = scopeChain->begin();
+ ScopeChainIterator end = scopeChain->end();
+ ASSERT(iter != end);
+
+ do {
+ JSObject* o = iter->get();
+ PropertySlot slot(o);
+ if (o->getPropertySlot(exec, ident, slot))
+ return slot.getValue(exec, ident);
+ } while (++iter != end);
+
+ exec->globalData().exception = createUndefinedVariableError(exec, ident);
+ return JSValue();
+}
+
+ALWAYS_INLINE JSValue opResolveSkip(ExecState* exec, Identifier& ident, int skip)
+{
+ ScopeChainNode* scopeChain = exec->scopeChain();
+
+ ScopeChainIterator iter = scopeChain->begin();
+ ScopeChainIterator end = scopeChain->end();
+ ASSERT(iter != end);
+ CodeBlock* codeBlock = exec->codeBlock();
+ bool checkTopLevel = codeBlock->codeType() == FunctionCode && codeBlock->needsFullScopeChain();
+ ASSERT(skip || !checkTopLevel);
+ if (checkTopLevel && skip--) {
+ if (exec->uncheckedR(codeBlock->activationRegister()).jsValue())
+ ++iter;
+ }
+ while (skip--) {
+ ++iter;
+ ASSERT(iter != end);
+ }
+ do {
+ JSObject* o = iter->get();
+ PropertySlot slot(o);
+ if (o->getPropertySlot(exec, ident, slot))
+ return slot.getValue(exec, ident);
+ } while (++iter != end);
+
+ exec->globalData().exception = createUndefinedVariableError(exec, ident);
+ return JSValue();
+}
+
+ALWAYS_INLINE JSValue opResolveWithBase(ExecState* exec, Identifier& ident, Register& baseSlot)
+{
+ ScopeChainNode* scopeChain = exec->scopeChain();
+
+ ScopeChainIterator iter = scopeChain->begin();
+ ScopeChainIterator end = scopeChain->end();
+
+ // FIXME: add scopeDepthIsZero optimization
+
+ ASSERT(iter != end);
+
+ JSObject* base;
+ do {
+ base = iter->get();
+ PropertySlot slot(base);
+ if (base->getPropertySlot(exec, ident, slot)) {
+ JSValue result = slot.getValue(exec, ident);
+ if (exec->globalData().exception)
+ return JSValue();
+
+ baseSlot = JSValue(base);
+ return result;
+ }
+ ++iter;
+ } while (iter != end);
+
+ exec->globalData().exception = createUndefinedVariableError(exec, ident);
+ return JSValue();
+}
+
+ALWAYS_INLINE JSValue opResolveWithThis(ExecState* exec, Identifier& ident, Register& baseSlot)
+{
+ ScopeChainNode* scopeChain = exec->scopeChain();
+
+ ScopeChainIterator iter = scopeChain->begin();
+ ScopeChainIterator end = scopeChain->end();
+
+ // FIXME: add scopeDepthIsZero optimization
+
+ ASSERT(iter != end);
+
+ JSObject* base;
+ do {
+ base = iter->get();
+ ++iter;
+ PropertySlot slot(base);
+ if (base->getPropertySlot(exec, ident, slot)) {
+ JSValue result = slot.getValue(exec, ident);
+ if (exec->globalData().exception)
+ return JSValue();
+
+ // All entries on the scope chain should be EnvironmentRecords (activations etc),
+ // other then 'with' object, which are directly referenced from the scope chain,
+ // and the global object. If we hit either an EnvironmentRecord or a global
+ // object at the end of the scope chain, this is undefined. If we hit a non-
+ // EnvironmentRecord within the scope chain, pass the base as the this value.
+ if (iter == end || base->structure()->typeInfo().isEnvironmentRecord())
+ baseSlot = jsUndefined();
+ else
+ baseSlot = JSValue(base);
+ return result;
+ }
+ } while (iter != end);
+
+ exec->globalData().exception = createUndefinedVariableError(exec, ident);
+ return JSValue();
+}
+
+} } // namespace JSC::CommonSlowPaths
+
+#endif // CommonSlowPaths_h
+
projects / apple / javascriptcore.git / blobdiff