Add support for on-demand AST deserialization

source/core/core.natvis

@@ -102,6 +102,14 @@
     </Expand>
 </Type>
 
+<Type Name="Slang::RelativePtr&lt;*,*&gt;">
+	<SmartPointer Usage="Minimal">_offset == 0 ? nullptr : ($T1*)((char*)this + _offset)</SmartPointer>
+	<DisplayString Condition="_offset == 0">{($T1*)0}</DisplayString>
+	<DisplayString Condition="_offset != 0">{($T1*)((char*)this + _offset)}</DisplayString>
+	<Expand>
+		<ExpandedItem>_offset == 0 ? nullptr : ($T1*)((char*)this + _offset)</ExpandedItem>
+	</Expand>
+</Type>
 
 <Type Name="Slang::Safe32Ptr&lt;*&gt;">
     <Expand>

source/core/slang-string.cpp

@@ -727,6 +727,22 @@ UnownedStringSlice UnownedStringSlice::subString(Index idx, Index len) const
     return UnownedStringSlice(m_begin + idx, m_begin + idx + len);
 }
 
+int compare(UnownedStringSlice const& lhs, UnownedStringSlice const& rhs)
+{
+    auto lhsSize = lhs.getLength();
+    auto rhsSize = rhs.getLength();
+
+    auto lhsData = lhs.begin();
+    auto rhsData = rhs.begin();
+
+    auto sharedPrefixSize = std::min(lhsSize, rhsSize);
+    int sharedPrefixCmp = memcmp(lhsData, rhsData, sharedPrefixSize);
+    if (sharedPrefixCmp != 0)
+        return sharedPrefixCmp;
+
+    return int(lhsSize - rhsSize);
+}
+
 bool UnownedStringSlice::operator==(ThisType const& other) const
 {
     // Note that memcmp is undefined when passed in null ptrs, so if we want to handle

source/core/slang-string.h

@@ -218,6 +218,14 @@ struct SLANG_RT_API UnownedStringSlice
     char const* m_end;
 };
 
+/// Three-way comparison of string slices.
+///
+/// * Returns 0 if `lhs == rhs`
+/// * Returns a value < 0 if `lhs < rhs`
+/// * Returns a value > 0 if `lhs > rhs`
+///
+int compare(UnownedStringSlice const& lhs, UnownedStringSlice const& rhs);
+
 // A more convenient way to make slices from *string literals*
 template<size_t SIZE>
 SLANG_FORCE_INLINE UnownedStringSlice toSlice(const char (&in)[SIZE])

source/slang/slang-ast-base.h

@@ -767,7 +767,7 @@ class Decl : public DeclBase
     /// method, which ensures that the `_prevInContainerWithSameName` fields
     /// have been properly set for all declarations in that container.
     ///
-    Decl* _prevInContainerWithSameName = nullptr;
+    FIDDLE() Decl* _prevInContainerWithSameName = nullptr;
 
     bool isChecked(DeclCheckState state) const { return checkState >= state; }
     void setCheckState(DeclCheckState state)