Add support for nested symbol references.

This change allows for adding additional nested references to a SymbolRefAttr to allow for further resolving a symbol if that symbol also defines a SymbolTable. If a referenced symbol also defines a symbol table, a nested reference can be used to refer to a symbol within that table. Nested references are printed after the main reference in the following form:

  symbol-ref-attribute ::= symbol-ref-id (`::` symbol-ref-id)*

Example:

  module @reference {
    func @nested_reference()
  }

  my_reference_op @reference::@nested_reference

Given that SymbolRefAttr is now more general, the existing functionality centered around a single reference is moved to a derived class FlatSymbolRefAttr. Followup commits will add support to lookups, rauw, etc. for scoped references.

PiperOrigin-RevId: 279860501

1 files changed, 1 insertions, 1 deletions

diff --git a/mlir/lib/Dialect/SPIRV/Serialization/Deserializer.cpp b/mlir/lib/Dialect/SPIRV/Serialization/Deserializer.cpp
index 11660ed4e87..40b53185529 100644
--- a/mlir/lib/Dialect/SPIRV/Serialization/Deserializer.cpp
+++ b/mlir/lib/Dialect/SPIRV/Serialization/Deserializer.cpp
@@ -970,7 +970,7 @@ LogicalResult Deserializer::processGlobalVariable(ArrayRef<uint32_t> operands) {
   wordIndex++;
 
   // Initializer.
-  SymbolRefAttr initializer = nullptr;
+  FlatSymbolRefAttr initializer = nullptr;
   if (wordIndex < operands.size()) {
     auto initializerOp = getGlobalVariable(operands[wordIndex]);
     if (!initializerOp) {