[wasm-gc] Improve error message for object allocators

Bug: v8:7748
Change-Id: I4382c73bf089672ab9f054754a87e27b51478b86
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2964602
Commit-Queue: Manos Koukoutos <manoskouk@chromium.org>
Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Cr-Commit-Position: refs/heads/master@{#75187}

src/wasm/function-body-decoder-impl.h

@@ -3875,7 +3875,7 @@ class WasmFullDecoder : public WasmDecoder<validate> {
                 rtt.type.is_bottom() ||
                 (rtt.type.ref_index() == imm.index && rtt.type.has_depth()))) {
           PopTypeError(imm.struct_type->field_count(), rtt,
-                       "rtt for type " + std::to_string(imm.index));
+                       "rtt with depth for type " + std::to_string(imm.index));
           return 0;
         }
         ArgVector args = PeekArgs(imm.struct_type, 1);
@@ -3912,7 +3912,8 @@ class WasmFullDecoder : public WasmDecoder<validate> {
         if (!VALIDATE(
                 rtt.type.is_bottom() ||
                 (rtt.type.ref_index() == imm.index && rtt.type.has_depth()))) {
-          PopTypeError(0, rtt, "rtt for type " + std::to_string(imm.index));
+          PopTypeError(0, rtt,
+                       "rtt with depth for type " + std::to_string(imm.index));
           return 0;
         }
         Value value = CreateValue(ValueType::Ref(imm.index, kNonNullable));
@@ -3997,7 +3998,8 @@ class WasmFullDecoder : public WasmDecoder<validate> {
         if (!VALIDATE(
                 rtt.type.is_bottom() ||
                 (rtt.type.ref_index() == imm.index && rtt.type.has_depth()))) {
-          PopTypeError(2, rtt, "rtt for type " + std::to_string(imm.index));
+          PopTypeError(2, rtt,
+                       "rtt with depth for type " + std::to_string(imm.index));
           return 0;
         }
         Value length = Peek(1, 1, kWasmI32);
@@ -4030,7 +4032,8 @@ class WasmFullDecoder : public WasmDecoder<validate> {
         if (!VALIDATE(
                 rtt.type.is_bottom() ||
                 (rtt.type.ref_index() == imm.index && rtt.type.has_depth()))) {
-          PopTypeError(1, rtt, "rtt for type " + std::to_string(imm.index));
+          PopTypeError(1, rtt,
+                       "rtt with depth for type " + std::to_string(imm.index));
           return 0;
         }
         Value length = Peek(1, 0, kWasmI32);

test/unittests/wasm/function-body-decoder-unittest.cc

@@ -3924,8 +3924,8 @@ TEST_F(FunctionBodyDecoderTest, GCStruct) {
                                           WASM_RTT_CANON(array_type_index)),
                  kExprDrop},
                 kAppendEnd,
-                "struct.new_with_rtt[1] expected rtt for type 0, found "
-                "rtt.canon of type (rtt 0 1)");
+                "struct.new_with_rtt[1] expected rtt with depth for type 0, "
+                "found rtt.canon of type (rtt 0 1)");
   // Out-of-bounds index.
   ExpectFailure(sigs.v_v(),
                 {WASM_STRUCT_NEW_WITH_RTT(42, WASM_I32V(0),
@@ -4057,8 +4057,8 @@ TEST_F(FunctionBodyDecoderTest, GCArray) {
                     array_type_index, WASM_REF_NULL(kFuncRefCode), WASM_I32V(5),
                     WASM_RTT_CANON(struct_type_index))},
                 kAppendEnd,
-                "array.new_with_rtt[2] expected rtt for type 0, found "
-                "rtt.canon of type (rtt 0 1)");
+                "array.new_with_rtt[2] expected rtt with depth for type 0, "
+                "found rtt.canon of type (rtt 0 1)");
   // Wrong type index.
   ExpectFailure(
       sigs.v_v(),