[Mlir-commits] [mlir] [mlir] Add support for DIGlobalVariable and DIGlobalVariableExpression (PR #73367)

[Justin Wilson]

================
@@ -109,3 +119,251 @@ bool MemoryEffectsAttr::isReadWrite() {
     return false;
   return true;
 }
+
+//===----------------------------------------------------------------------===//
+// DIExpression
+//===----------------------------------------------------------------------===//
+
+DIExpressionAttr DIExpressionAttr::get(MLIRContext *context) {
+  return get(context, ArrayRef<uint64_t>({}));
+}
+
+#define _FORMAT_DW_OP(x) #x
+#define FORMAT_DW_OP(NAME, VENDOR) _FORMAT_DW_OP(DW_OP_##VENDOR##_##NAME)
+
+size_t queryNumOpParams(llvm::dwarf::LocationAtom op) {
+  switch (op) {
+  case llvm::dwarf::DW_OP_addr:
+  case llvm::dwarf::DW_OP_const1u:
+  case llvm::dwarf::DW_OP_const1s:
+  case llvm::dwarf::DW_OP_const2u:
+  case llvm::dwarf::DW_OP_const2s:
+  case llvm::dwarf::DW_OP_const4u:
+  case llvm::dwarf::DW_OP_const4s:
+  case llvm::dwarf::DW_OP_const8u:
+  case llvm::dwarf::DW_OP_const8s:
+  case llvm::dwarf::DW_OP_constu:
+  case llvm::dwarf::DW_OP_consts:
+  case llvm::dwarf::DW_OP_pick:
+  case llvm::dwarf::DW_OP_plus_uconst:
+  case llvm::dwarf::DW_OP_bra:
+  case llvm::dwarf::DW_OP_skip:
+  case llvm::dwarf::DW_OP_breg0:
+  case llvm::dwarf::DW_OP_breg1:
+  case llvm::dwarf::DW_OP_breg2:
+  case llvm::dwarf::DW_OP_breg3:
+  case llvm::dwarf::DW_OP_breg4:
+  case llvm::dwarf::DW_OP_breg5:
+  case llvm::dwarf::DW_OP_breg6:
+  case llvm::dwarf::DW_OP_breg7:
+  case llvm::dwarf::DW_OP_breg8:
+  case llvm::dwarf::DW_OP_breg9:
+  case llvm::dwarf::DW_OP_breg10:
+  case llvm::dwarf::DW_OP_breg11:
+  case llvm::dwarf::DW_OP_breg12:
+  case llvm::dwarf::DW_OP_breg13:
+  case llvm::dwarf::DW_OP_breg14:
+  case llvm::dwarf::DW_OP_breg15:
+  case llvm::dwarf::DW_OP_breg16:
+  case llvm::dwarf::DW_OP_breg17:
+  case llvm::dwarf::DW_OP_breg18:
+  case llvm::dwarf::DW_OP_breg19:
+  case llvm::dwarf::DW_OP_breg20:
+  case llvm::dwarf::DW_OP_breg21:
+  case llvm::dwarf::DW_OP_breg22:
+  case llvm::dwarf::DW_OP_breg23:
+  case llvm::dwarf::DW_OP_breg24:
+  case llvm::dwarf::DW_OP_breg25:
+  case llvm::dwarf::DW_OP_breg26:
+  case llvm::dwarf::DW_OP_breg27:
+  case llvm::dwarf::DW_OP_breg28:
+  case llvm::dwarf::DW_OP_breg29:
+  case llvm::dwarf::DW_OP_breg30:
+  case llvm::dwarf::DW_OP_breg31:
+  case llvm::dwarf::DW_OP_regx:
+  case llvm::dwarf::DW_OP_fbreg:
+  case llvm::dwarf::DW_OP_piece:
+  case llvm::dwarf::DW_OP_deref_size:
+  case llvm::dwarf::DW_OP_xderef_size:
+  case llvm::dwarf::DW_OP_call2:
+  case llvm::dwarf::DW_OP_call4:
+  case llvm::dwarf::DW_OP_call_ref:
+  case llvm::dwarf::DW_OP_addrx:
+  case llvm::dwarf::DW_OP_constx:
+  case llvm::dwarf::DW_OP_convert:
+  case llvm::dwarf::DW_OP_reinterpret:
+    return 1;
+  case llvm::dwarf::DW_OP_bregx:
+  case llvm::dwarf::DW_OP_bit_piece:
+  case llvm::dwarf::DW_OP_implicit_value:
+  case llvm::dwarf::DW_OP_implicit_pointer:
+  case llvm::dwarf::DW_OP_entry_value:
+  case llvm::dwarf::DW_OP_regval_type:
+  case llvm::dwarf::DW_OP_deref_type:
+  case llvm::dwarf::DW_OP_xderef_type:
+    return 2;
+  case llvm::dwarf::DW_OP_const_type:
+    return 3;
+  default:
+    return 0;
+  }
+}
+
+::mlir::Attribute DIExpressionAttr::parse(AsmParser &parser, Type type) {
----------------
waj334 wrote:

I can go through the trouble of defining the expression operators in tablegen as it would be a better long term approach, but there would be close to 200 of them. The preprocessor define approach nicely automated this and stays consistent with LLVM automatically, but I think it introduces overhead during parsing/printing since the switch may actually touch the whole range of them. I can take the declarative approach if you think it is worthwhile for this.

https://github.com/llvm/llvm-project/pull/73367