JavaScriptCore-7601.1.46.3.tar.gz

[apple/javascriptcore.git] / bytecode / GetByIdVariant.cpp

diff --git a/bytecode/GetByIdVariant.cpp b/bytecode/GetByIdVariant.cpp
index b8bedce4f0d23c2602e0afb803c9fc21b204e0f9..dd8e8dfb5e8e0cc5b35a46f01db963864b7d9871 100644 (file)
--- a/bytecode/GetByIdVariant.cpp
+++ b/bytecode/GetByIdVariant.cpp
@@ -26,10 +26,79 @@
 #include "config.h"
 #include "GetByIdVariant.h"
 
+#include "CallLinkStatus.h"
 #include "JSCInlines.h"
+#include <wtf/ListDump.h>
 
 namespace JSC {
 
+GetByIdVariant::GetByIdVariant(
+    const StructureSet& structureSet, PropertyOffset offset,
+    const IntendedStructureChain* chain, std::unique_ptr<CallLinkStatus> callLinkStatus)
+    : m_structureSet(structureSet)
+    , m_alternateBase(nullptr)
+    , m_offset(offset)
+    , m_callLinkStatus(WTF::move(callLinkStatus))
+{
+    if (!structureSet.size()) {
+        ASSERT(offset == invalidOffset);
+        ASSERT(!chain);
+    }
+    
+    if (chain && chain->size()) {
+        m_alternateBase = chain->terminalPrototype();
+        chain->gatherChecks(m_constantChecks);
+    }
+}
+
+GetByIdVariant::~GetByIdVariant() { }
+
+GetByIdVariant::GetByIdVariant(const GetByIdVariant& other)
+    : GetByIdVariant()
+{
+    *this = other;
+}
+
+GetByIdVariant& GetByIdVariant::operator=(const GetByIdVariant& other)
+{
+    m_structureSet = other.m_structureSet;
+    m_constantChecks = other.m_constantChecks;
+    m_alternateBase = other.m_alternateBase;
+    m_offset = other.m_offset;
+    if (other.m_callLinkStatus)
+        m_callLinkStatus = std::make_unique<CallLinkStatus>(*other.m_callLinkStatus);
+    else
+        m_callLinkStatus = nullptr;
+    return *this;
+}
+
+StructureSet GetByIdVariant::baseStructure() const
+{
+    if (!m_alternateBase)
+        return structureSet();
+    
+    Structure* structure = structureFor(m_constantChecks, m_alternateBase);
+    RELEASE_ASSERT(structure);
+    return structure;
+}
+
+bool GetByIdVariant::attemptToMerge(const GetByIdVariant& other)
+{
+    if (m_alternateBase != other.m_alternateBase)
+        return false;
+    if (m_offset != other.m_offset)
+        return false;
+    if (m_callLinkStatus || other.m_callLinkStatus)
+        return false;
+    if (!areCompatible(m_constantChecks, other.m_constantChecks))
+        return false;
+    
+    mergeInto(other.m_constantChecks, m_constantChecks);
+    m_structureSet.merge(other.m_structureSet);
+    
+    return true;
+}
+
 void GetByIdVariant::dump(PrintStream& out) const
 {
     dumpInContext(out, 0);
@@ -44,8 +113,13 @@ void GetByIdVariant::dumpInContext(PrintStream& out, DumpContext* context) const
     
     out.print(
         "<", inContext(structureSet(), context), ", ",
-        pointerDumpInContext(chain(), context), ", ",
-        inContext(specificValue(), context), ", ", offset(), ">");
+        "[", listDumpInContext(m_constantChecks, context), "]");
+    if (m_alternateBase)
+        out.print(", alternateBase = ", inContext(JSValue(m_alternateBase), context));
+    out.print(", offset = ", offset());
+    if (m_callLinkStatus)
+        out.print(", call = ", *m_callLinkStatus);
+    out.print(">");
 }
 
 } // namespace JSC