================
@@ -892,6 +892,25 @@ static llvm::Error
Evaluate_DW_OP_deref_size(DWARFExpression::Stack &stack,
return llvm::createStringError(
"Invalid address size for DW_OP_deref_size: %d\n", size);
+ // Deref a register or implicit location and truncate the value to `size`
+ // bytes. See the corresponding comment in DW_OP_deref for more details on
+ // why we deref these locations this way.
+ if (dwarf4_location_description_kind == Register ||
+ dwarf4_location_description_kind == Implicit) {
+ // Reset context to default values.
+ dwarf4_location_description_kind = Memory;
+ stack.back().ClearContext();
+
+ // Truncate the value on top of the stack to *size* bytes then
+ // extend to the size of an address (e.g. generic type).
+ Scalar scalar = stack.back().GetScalar();
+ scalar.TruncOrExtendTo(size * 8, /*sign=*/false);
----------------
clayborg wrote:
Lets wait on `DW_OP_LLVM_offset` for now until we need it.
https://github.com/llvm/llvm-project/pull/169419
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