Redesign `DeclRef` and systematic `Val` deduplication (#3049)

* Redesign DeclRef + Deduplicate Val.

* Update project files

* Fix warning.

* Fix.

* Fix.

* Remove `Val::_equalsImplOverride`.

* Rmove `Val::_getHashCodeOverride`.

* Remove `semanticVisitor` param from `resolve`.

* Cleanups.

---------

Co-authored-by: Yong He <yhe@nvidia.com>

1 files changed, 33 insertions, 0 deletions

diff --git a/source/slang/slang-ast-base.cpp b/source/slang/slang-ast-base.cpp
new file mode 100644
index 000000000..0ad2bb101
--- /dev/null
+++ b/source/slang/slang-ast-base.cpp
@@ -0,0 +1,33 @@
+#include "slang-ast-base.h"
+#include "slang-ast-builder.h"
+
+namespace Slang
+{
+void NodeBase::_initDebug(ASTNodeType inAstNodeType, ASTBuilder* inAstBuilder)
+{
+#ifdef _DEBUG
+    SLANG_UNUSED(inAstNodeType);
+    static int32_t uidCounter = 0;
+    static int32_t breakValue = 0;
+    uidCounter++;
+    _debugUID = uidCounter;
+    if (inAstBuilder->getId() == -1)
+        _debugUID = -_debugUID;
+    if (breakValue != 0 && _debugUID == breakValue)
+        SLANG_BREAKPOINT(0)
+#else
+    SLANG_UNUSED(inAstNodeType);
+    SLANG_UNUSED(inAstBuilder);
+#endif
+}
+DeclRefBase* Decl::getDefaultDeclRef()
+{
+    auto astBuilder = getCurrentASTBuilder();
+    if (astBuilder->getEpoch() != m_defaultDeclRefEpoch || !m_defaultDeclRef)
+    {
+        m_defaultDeclRef = astBuilder->getDirectDeclRef(this);
+        m_defaultDeclRefEpoch = astBuilder->getEpoch();
+    }
+    return m_defaultDeclRef;
+}
+}