webkitgtk-2.10.2webkitgtk-2.10.2

1 files changed, 247 insertions, 0 deletions

diff --git a/Source/JavaScriptCore/bytecode/CodeOrigin.cpp b/Source/JavaScriptCore/bytecode/CodeOrigin.cpp
new file mode 100644
index 000000000..15f759165
--- /dev/null
+++ b/Source/JavaScriptCore/bytecode/CodeOrigin.cpp
@@ -0,0 +1,247 @@
+/*
+ * Copyright (C) 2012-2015 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. 
+ */
+
+#include "config.h"
+#include "CodeOrigin.h"
+
+#include "CallFrame.h"
+#include "CodeBlock.h"
+#include "Executable.h"
+#include "JSCInlines.h"
+
+namespace JSC {
+
+unsigned CodeOrigin::inlineDepthForCallFrame(InlineCallFrame* inlineCallFrame)
+{
+    unsigned result = 1;
+    for (InlineCallFrame* current = inlineCallFrame; current; current = current->caller.inlineCallFrame)
+        result++;
+    return result;
+}
+
+unsigned CodeOrigin::inlineDepth() const
+{
+    return inlineDepthForCallFrame(inlineCallFrame);
+}
+
+bool CodeOrigin::isApproximatelyEqualTo(const CodeOrigin& other) const
+{
+    CodeOrigin a = *this;
+    CodeOrigin b = other;
+
+    if (!a.isSet())
+        return !b.isSet();
+    if (!b.isSet())
+        return false;
+    
+    if (a.isHashTableDeletedValue())
+        return b.isHashTableDeletedValue();
+    if (b.isHashTableDeletedValue())
+        return false;
+    
+    for (;;) {
+        ASSERT(a.isSet());
+        ASSERT(b.isSet());
+        
+        if (a.bytecodeIndex != b.bytecodeIndex)
+            return false;
+        
+        if ((!!a.inlineCallFrame) != (!!b.inlineCallFrame))
+            return false;
+        
+        if (!a.inlineCallFrame)
+            return true;
+        
+        if (a.inlineCallFrame->executable.get() != b.inlineCallFrame->executable.get())
+            return false;
+        
+        a = a.inlineCallFrame->caller;
+        b = b.inlineCallFrame->caller;
+    }
+}
+
+unsigned CodeOrigin::approximateHash() const
+{
+    if (!isSet())
+        return 0;
+    if (isHashTableDeletedValue())
+        return 1;
+    
+    unsigned result = 2;
+    CodeOrigin codeOrigin = *this;
+    for (;;) {
+        result += codeOrigin.bytecodeIndex;
+        
+        if (!codeOrigin.inlineCallFrame)
+            return result;
+        
+        result += WTF::PtrHash<JSCell*>::hash(codeOrigin.inlineCallFrame->executable.get());
+        
+        codeOrigin = codeOrigin.inlineCallFrame->caller;
+    }
+}
+
+Vector<CodeOrigin> CodeOrigin::inlineStack() const
+{
+    Vector<CodeOrigin> result(inlineDepth());
+    result.last() = *this;
+    unsigned index = result.size() - 2;
+    for (InlineCallFrame* current = inlineCallFrame; current; current = current->caller.inlineCallFrame)
+        result[index--] = current->caller;
+    RELEASE_ASSERT(!result[0].inlineCallFrame);
+    return result;
+}
+
+void CodeOrigin::dump(PrintStream& out) const
+{
+    if (!isSet()) {
+        out.print("<none>");
+        return;
+    }
+    
+    Vector<CodeOrigin> stack = inlineStack();
+    for (unsigned i = 0; i < stack.size(); ++i) {
+        if (i)
+            out.print(" --> ");
+        
+        if (InlineCallFrame* frame = stack[i].inlineCallFrame) {
+            out.print(frame->briefFunctionInformation(), ":<", RawPointer(frame->executable.get()), "> ");
+            if (frame->isClosureCall)
+                out.print("(closure) ");
+        }
+        
+        out.print("bc#", stack[i].bytecodeIndex);
+    }
+}
+
+void CodeOrigin::dumpInContext(PrintStream& out, DumpContext*) const
+{
+    dump(out);
+}
+
+JSFunction* InlineCallFrame::calleeConstant() const
+{
+    if (calleeRecovery.isConstant())
+        return jsCast<JSFunction*>(calleeRecovery.constant());
+    return nullptr;
+}
+
+void InlineCallFrame::visitAggregate(SlotVisitor& visitor)
+{
+    // FIXME: This is an antipattern for two reasons. References introduced by the DFG
+    // that aren't in the original CodeBlock being compiled should be weakly referenced.
+    // Inline call frames aren't in the original CodeBlock, so they qualify as weak. Also,
+    // those weak references should already be tracked in the DFG as weak FrozenValues. So,
+    // there is probably no need for this. We already have assertions that this should be
+    // unnecessary. Finally, just marking the executable and not anything else in the inline
+    // call frame is almost certainly insufficient for what this method thought it was going
+    // to accomplish.
+    // https://bugs.webkit.org/show_bug.cgi?id=146613
+    visitor.append(&executable);
+}
+
+JSFunction* InlineCallFrame::calleeForCallFrame(ExecState* exec) const
+{
+    return jsCast<JSFunction*>(calleeRecovery.recover(exec));
+}
+
+CodeBlockHash InlineCallFrame::hash() const
+{
+    return jsCast<FunctionExecutable*>(executable.get())->codeBlockFor(
+        specializationKind())->hash();
+}
+
+CString InlineCallFrame::hashAsStringIfPossible() const
+{
+    return jsCast<FunctionExecutable*>(executable.get())->codeBlockFor(
+        specializationKind())->hashAsStringIfPossible();
+}
+
+CString InlineCallFrame::inferredName() const
+{
+    return jsCast<FunctionExecutable*>(executable.get())->inferredName().utf8();
+}
+
+CodeBlock* InlineCallFrame::baselineCodeBlock() const
+{
+    return jsCast<FunctionExecutable*>(executable.get())->baselineCodeBlockFor(specializationKind());
+}
+
+void InlineCallFrame::dumpBriefFunctionInformation(PrintStream& out) const
+{
+    out.print(inferredName(), "#", hashAsStringIfPossible());
+}
+
+void InlineCallFrame::dumpInContext(PrintStream& out, DumpContext* context) const
+{
+    out.print(briefFunctionInformation(), ":<", RawPointer(executable.get()));
+    if (executable->isStrictMode())
+        out.print(" (StrictMode)");
+    out.print(", bc#", caller.bytecodeIndex, ", ", kind);
+    if (isClosureCall)
+        out.print(", closure call");
+    else
+        out.print(", known callee: ", inContext(calleeRecovery.constant(), context));
+    out.print(", numArgs+this = ", arguments.size());
+    out.print(", stackOffset = ", stackOffset);
+    out.print(" (", virtualRegisterForLocal(0), " maps to ", virtualRegisterForLocal(0) + stackOffset, ")>");
+}
+
+void InlineCallFrame::dump(PrintStream& out) const
+{
+    dumpInContext(out, 0);
+}
+
+} // namespace JSC
+
+namespace WTF {
+
+void printInternal(PrintStream& out, JSC::InlineCallFrame::Kind kind)
+{
+    switch (kind) {
+    case JSC::InlineCallFrame::Call:
+        out.print("Call");
+        return;
+    case JSC::InlineCallFrame::Construct:
+        out.print("Construct");
+        return;
+    case JSC::InlineCallFrame::CallVarargs:
+        out.print("CallVarargs");
+        return;
+    case JSC::InlineCallFrame::ConstructVarargs:
+        out.print("ConstructVarargs");
+        return;
+    case JSC::InlineCallFrame::GetterCall:
+        out.print("GetterCall");
+        return;
+    case JSC::InlineCallFrame::SetterCall:
+        out.print("SetterCall");
+        return;
+    }
+    RELEASE_ASSERT_NOT_REACHED();
+}
+
+} // namespace WTF
+