[CIR] Add support for parsing complete records (#147403)

When complete record support was initially added, the parsing support
was left incomplete. This change adds the necessary parsing.

Author: andykaylor

clang/include/clang/CIR/Dialect/IR/CIRTypes.td

@@ -509,9 +509,12 @@ def CIR_RecordType : CIR_Type<"Record", "record", [
     A few examples:
 
     ```mlir
-        !complete = !cir.record<struct "complete" {!cir.int<u, 8>}>
-        !incomplete = !cir.record<struct "incomplete" incomplete>
-        !anonymous = !cir.record<struct {!cir.int<u, 8>}>
+        !rec_complete = !cir.record<struct "complete" {!u8i}>
+        !rec_incomplete = !cir.record<struct "incomplete" incomplete>
+        !anonymous_struct = !cir.record<struct {!u8i}>
+        !rec_p1 = !cir.record<struct "p1" packed {!u8i, !u8i}>
+        !rec_p2 = !cir.record<struct "p2" padded {!u8i, !u8i}>
+        !rec_p3 = !cir.record<struct "p3" packed padded {!s32i, !u8i, !u8i}>
     ```
 
     Incomplete records are mutable, meaning they can be later completed with a
@@ -552,7 +555,7 @@ def CIR_RecordType : CIR_Type<"Record", "record", [
       "bool":$padded,
       "RecordKind":$kind
     ), [{
-      return $_get($_ctxt, members, name, /*complete=*/true, packed, padded,
+      return $_get($_ctxt, members, name, /*incomplete=*/false, packed, padded,
                    kind);
     }]>,
 
@@ -564,6 +567,17 @@ def CIR_RecordType : CIR_Type<"Record", "record", [
       return $_get($_ctxt, /*members=*/llvm::ArrayRef<Type>{}, name,
                          /*incomplete=*/true, /*packed=*/false,
                          /*padded=*/false, kind);
+    }]>,
+
+    // Create an anonymous record type (always complete).
+    TypeBuilder<(ins
+      "llvm::ArrayRef<mlir::Type>":$members,
+      "bool":$packed,
+      "bool":$padded,
+      "RecordKind":$kind
+    ), [{
+      return $_get($_ctxt, members, mlir::StringAttr{}, /*incomplete=*/false,
+                      packed, padded, kind);
     }]>];
 
   let extraClassDeclaration = [{

clang/lib/CIR/Dialect/IR/CIRTypes.cpp

@@ -96,6 +96,8 @@ Type RecordType::parse(mlir::AsmParser &parser) {
   FailureOr<AsmParser::CyclicParseReset> cyclicParseGuard;
   const llvm::SMLoc loc = parser.getCurrentLocation();
   const mlir::Location eLoc = parser.getEncodedSourceLoc(loc);
+  bool packed = false;
+  bool padded = false;
   RecordKind kind;
   mlir::MLIRContext *context = parser.getContext();
 
@@ -138,6 +140,12 @@ Type RecordType::parse(mlir::AsmParser &parser) {
     }
   }
 
+  if (parser.parseOptionalKeyword("packed").succeeded())
+    packed = true;
+
+  if (parser.parseOptionalKeyword("padded").succeeded())
+    padded = true;
+
   // Parse record members or lack thereof.
   bool incomplete = true;
   llvm::SmallVector<mlir::Type> members;
@@ -159,8 +167,15 @@ Type RecordType::parse(mlir::AsmParser &parser) {
   mlir::Type type = {};
   if (name && incomplete) { // Identified & incomplete
     type = getChecked(eLoc, context, name, kind);
-  } else if (!incomplete) { // complete
-    parser.emitError(loc, "complete records are not yet supported");
+  } else if (!name && !incomplete) { // Anonymous & complete
+    type = getChecked(eLoc, context, membersRef, packed, padded, kind);
+  } else if (!incomplete) { // Identified & complete
+    type = getChecked(eLoc, context, membersRef, name, packed, padded, kind);
+    // If the record has a self-reference, its type already exists in a
+    // incomplete state. In this case, we must complete it.
+    if (mlir::cast<RecordType>(type).isIncomplete())
+      mlir::cast<RecordType>(type).complete(membersRef, packed, padded);
+    assert(!cir::MissingFeatures::astRecordDeclAttr());
   } else { // anonymous & incomplete
     parser.emitError(loc, "anonymous records must be complete");
     return {};

clang/test/CIR/IR/struct.cir

@@ -1,19 +1,74 @@
 // RUN: cir-opt %s | FileCheck %s
 
+!u8i = !cir.int<u, 8>
+!u16i = !cir.int<u, 16>
+!s32i = !cir.int<s, 32>
+!u32i = !cir.int<u, 32>
+
 !rec_C = !cir.record<class "C" incomplete>
 !rec_S = !cir.record<struct "S" incomplete>
 !rec_U = !cir.record<union "U" incomplete>
 
-// CHECK: !rec_C = !cir.record<class "C" incomplete>
-// CHECK: !rec_S = !cir.record<struct "S" incomplete>
-// CHECK: !rec_U = !cir.record<union "U" incomplete>
+// CHECK-DAG: !rec_C = !cir.record<class "C" incomplete>
+// CHECK-DAG: !rec_S = !cir.record<struct "S" incomplete>
+// CHECK-DAG: !rec_U = !cir.record<union "U" incomplete>
+
+!rec_anon_struct = !cir.record<struct {!cir.array<!cir.ptr<!u8i> x 5>}>
+!rec_anon_struct1 = !cir.record<struct {!cir.ptr<!u8i>, !cir.ptr<!u8i>, !cir.ptr<!u8i>}>
+!rec_S1 = !cir.record<struct "S1" {!s32i, !s32i}>
+!rec_Sc = !cir.record<struct "Sc" {!u8i, !u16i, !u32i}>
+
+// CHECK-DAG: !cir.record<struct {!cir.array<!cir.ptr<!u8i> x 5>}>
+// CHECK-DAG: !cir.record<struct {!cir.ptr<!u8i>, !cir.ptr<!u8i>, !cir.ptr<!u8i>}>
+// CHECK-DAG: !rec_S1 = !cir.record<struct "S1" {!s32i, !s32i}>
+// CHECK-DAG: !rec_Sc = !cir.record<struct "Sc" {!u8i, !u16i, !u32i}>
+
+// Packed and padded structs
+!rec_P1 = !cir.record<struct "P1" packed {!s32i, !s32i}>
+!rec_P2 = !cir.record<struct "P2" padded {!u8i, !u16i, !u32i}>
+!rec_P3 = !cir.record<struct "P3" packed padded {!u8i, !u16i, !u32i}>
+
+// CHECK-DAG: !rec_P1 = !cir.record<struct "P1" packed {!s32i, !s32i}>
+// CHECK-DAG: !rec_P2 = !cir.record<struct "P2" padded {!u8i, !u16i, !u32i}>
+// CHECK-DAG: !rec_P3 = !cir.record<struct "P3" packed padded {!u8i, !u16i, !u32i}>
 
-module  {
-    cir.global external @p1 = #cir.ptr<null> : !cir.ptr<!rec_S>
-    cir.global external @p2 = #cir.ptr<null> : !cir.ptr<!rec_U>
-    cir.global external @p3 = #cir.ptr<null> : !cir.ptr<!rec_C>
-}
 
+// Complete a previously incomplete record
+!rec_A = !cir.record<class "A" incomplete>
+!rec_Ac = !cir.record<class "A" {!u8i, !s32i}>
+// CHECK-DAG: !rec_A = !cir.record<class "A" {!u8i, !s32i}>
+
+// Test recursive struct parsing/printing.
+!rec_Node = !cir.record<struct "Node" {!cir.ptr<!cir.record<struct "Node">>}>
+// CHECK-DAG: !cir.record<struct "Node" {!cir.ptr<!cir.record<struct "Node">>}>
+
+module  {
+  cir.global external @p1 = #cir.ptr<null> : !cir.ptr<!rec_S>
+  cir.global external @p2 = #cir.ptr<null> : !cir.ptr<!rec_U>
+  cir.global external @p3 = #cir.ptr<null> : !cir.ptr<!rec_C>
 // CHECK: cir.global external @p1 = #cir.ptr<null> : !cir.ptr<!rec_S>
 // CHECK: cir.global external @p2 = #cir.ptr<null> : !cir.ptr<!rec_U>
 // CHECK: cir.global external @p3 = #cir.ptr<null> : !cir.ptr<!rec_C>
+
+  // Dummy function to use types and force them to be printed.
+  cir.func @useTypes(%arg0: !rec_Node,
+                     %arg1: !rec_anon_struct1,
+                     %arg2: !rec_anon_struct,
+                     %arg3: !rec_S1,
+                     %arg4: !rec_Ac,
+                     %arg5: !rec_P1,
+                     %arg6: !rec_P2,
+                     %arg7: !rec_P3) {
+    cir.return
+  }
+
+  cir.func @structs() {
+    %0 = cir.alloca !cir.ptr<!cir.record<struct "Sc" {!u8i, !u16i, !u32i}>>, !cir.ptr<!cir.ptr<!cir.record<struct "Sc" {!u8i, !u16i, !u32i}>>>, ["sc", init]
+    %1 = cir.alloca !cir.ptr<!cir.record<union "U" incomplete>>, !cir.ptr<!cir.ptr<!cir.record<union "U" incomplete>>>, ["u", init]
+    cir.return
+  }
+
+// CHECK: cir.func @structs() {
+// CHECK:     %0 = cir.alloca !cir.ptr<!rec_Sc>, !cir.ptr<!cir.ptr<!rec_Sc>>, ["sc", init]
+// CHECK:     %1 = cir.alloca !cir.ptr<!rec_U>, !cir.ptr<!cir.ptr<!rec_U>>, ["u", init]
+}