[wasm-gc] Add a basic test case for structs

Bug: v8:7748
Change-Id: I80265c7070dc7ec421bf53aa717a727c144b0699
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2152844
Commit-Queue: Jakob Kummerow <jkummerow@chromium.org>
Reviewed-by: Andreas Haas <ahaas@chromium.org>
Cr-Commit-Position: refs/heads/master@{#67288}

src/compiler/wasm-compiler.cc

@@ -5382,8 +5382,9 @@ class WasmWrapperGraphBuilder : public WasmGraphBuilder {
       case wasm::ValueType::kRef:
       case wasm::ValueType::kOptRef:
       case wasm::ValueType::kEqRef:
-        // TODO(7748): Implement
-        UNIMPLEMENTED();
+        // TODO(7748): Implement properly. For now, we just expose the raw
+        // object for testing.
+        return node;
       case wasm::ValueType::kStmt:
       case wasm::ValueType::kBottom:
         UNREACHABLE();

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

@@ -2887,7 +2887,7 @@ class WasmFullDecoder : public WasmDecoder<validate> {
         len += imm.length;
         if (!this->Validate(this->pc_, imm)) break;
         auto args = PopArgs(imm.struct_type);
-        auto* value = Push(ValueType(ValueType::kEqRef, imm.index));
+        auto* value = Push(ValueType(ValueType::kRef, imm.index));
         CALL_INTERFACE_IF_REACHABLE(StructNew, imm, args.begin(), value);
         break;
       }
@@ -2895,7 +2895,9 @@ class WasmFullDecoder : public WasmDecoder<validate> {
         FieldIndexImmediate<validate> field(this, this->pc_ + len);
         if (!this->Validate(this->pc_ + len, field)) break;
         len += field.length;
-        auto struct_obj = Pop(0, kWasmEqRef);
+        // TODO(7748): This should take an optref, and perform a null-check.
+        auto struct_obj =
+            Pop(0, ValueType(ValueType::kRef, field.struct_index.index));
         auto* value = Push(field.struct_index.struct_type->field(field.index));
         CALL_INTERFACE_IF_REACHABLE(StructGet, struct_obj, field, value);
         break;

src/wasm/module-decoder.cc

@@ -1744,11 +1744,15 @@ class ModuleDecoderImpl : public Decoder {
               if (enabled_features_.has_eh()) return kWasmExnRef;
               break;
             case kLocalRef:
-              if (enabled_features_.has_gc()) return ValueType(ValueType::kRef);
+              if (enabled_features_.has_gc()) {
+                uint32_t type_index = consume_u32v("type index");
+                return ValueType(ValueType::kRef, type_index);
+              }
               break;
             case kLocalOptRef:
               if (enabled_features_.has_gc()) {
-                return ValueType(ValueType::kOptRef);
+                uint32_t type_index = consume_u32v("type index");
+                return ValueType(ValueType::kOptRef, type_index);
               }
               break;
             case kLocalEqRef:

src/wasm/wasm-module-builder.cc

@@ -239,7 +239,7 @@ void WasmFunctionBuilder::WriteAsmWasmOffsetTable(ZoneBuffer* buffer) const {
 
 WasmModuleBuilder::WasmModuleBuilder(Zone* zone)
     : zone_(zone),
-      signatures_(zone),
+      types_(zone),
       function_imports_(zone),
       global_imports_(zone),
       exports_(zone),
@@ -274,9 +274,15 @@ void WasmModuleBuilder::AddDataSegment(const byte* data, uint32_t size,
 uint32_t WasmModuleBuilder::AddSignature(FunctionSig* sig) {
   auto sig_entry = signature_map_.find(*sig);
   if (sig_entry != signature_map_.end()) return sig_entry->second;
-  uint32_t index = static_cast<uint32_t>(signatures_.size());
+  uint32_t index = static_cast<uint32_t>(types_.size());
   signature_map_.emplace(*sig, index);
-  signatures_.push_back(sig);
+  types_.push_back(Type(sig));
+  return index;
+}
+
+uint32_t WasmModuleBuilder::AddStructType(StructType* type) {
+  uint32_t index = static_cast<uint32_t>(types_.size());
+  types_.push_back(Type(type));
   return index;
 }
 
@@ -399,25 +405,50 @@ void WasmModuleBuilder::SetMaxMemorySize(uint32_t value) {
 
 void WasmModuleBuilder::SetHasSharedMemory() { has_shared_memory_ = true; }
 
+namespace {
+void WriteValueType(ZoneBuffer* buffer, const ValueType& type) {
+  buffer->write_u8(type.value_type_code());
+  if (type.kind() == ValueType::kRef || type.kind() == ValueType::kOptRef) {
+    buffer->write_u32v(type.ref_index());
+  }
+}
+
+}  // namespace
+
 void WasmModuleBuilder::WriteTo(ZoneBuffer* buffer) const {
   // == Emit magic =============================================================
   buffer->write_u32(kWasmMagic);
   buffer->write_u32(kWasmVersion);
 
-  // == Emit signatures ========================================================
-  if (signatures_.size() > 0) {
+  // == Emit types =============================================================
+  if (types_.size() > 0) {
     size_t start = EmitSection(kTypeSectionCode, buffer);
-    buffer->write_size(signatures_.size());
+    buffer->write_size(types_.size());
 
-    for (FunctionSig* sig : signatures_) {
+    for (const Type& type : types_) {
+      switch (type.kind) {
+        case Type::kFunctionSig: {
+          FunctionSig* sig = type.sig;
           buffer->write_u8(kWasmFunctionTypeCode);
           buffer->write_size(sig->parameter_count());
           for (auto param : sig->parameters()) {
-        buffer->write_u8(param.value_type_code());
+            WriteValueType(buffer, param);
           }
           buffer->write_size(sig->return_count());
           for (auto ret : sig->returns()) {
-        buffer->write_u8(ret.value_type_code());
+            WriteValueType(buffer, ret);
+          }
+          break;
+        }
+        case Type::kStructType: {
+          StructType* struct_type = type.type;
+          buffer->write_u8(kWasmStructTypeCode);
+          buffer->write_size(struct_type->field_count());
+          for (auto field : struct_type->fields()) {
+            WriteValueType(buffer, field);
+          }
+          break;
+        }
       }
     }
     FixupSection(buffer, start);

src/wasm/wasm-module-builder.h

@@ -241,6 +241,7 @@ class V8_EXPORT_PRIVATE WasmModuleBuilder : public ZoneObject {
                            bool mutability, Vector<const char> module = {});
   void AddDataSegment(const byte* data, uint32_t size, uint32_t dest);
   uint32_t AddSignature(FunctionSig* sig);
+  uint32_t AddStructType(StructType* type);
   // In the current implementation, it's supported to have uninitialized slots
   // at the beginning and/or end of the indirect function table, as long as
   // the filled slots form a contiguous block in the middle.
@@ -268,9 +269,25 @@ class V8_EXPORT_PRIVATE WasmModuleBuilder : public ZoneObject {
 
   Zone* zone() { return zone_; }
 
-  FunctionSig* GetSignature(uint32_t index) { return signatures_[index]; }
+  FunctionSig* GetSignature(uint32_t index) {
+    DCHECK(types_[index].kind == Type::kFunctionSig);
+    return types_[index].sig;
+  }
 
  private:
+  struct Type {
+    enum Kind { kFunctionSig, kStructType };
+    explicit Type(FunctionSig* signature)
+        : kind(kFunctionSig), sig(signature) {}
+    explicit Type(StructType* struct_type)
+        : kind(kStructType), type(struct_type) {}
+    Kind kind;
+    union {
+      FunctionSig* sig;
+      StructType* type;
+    };
+  };
+
   struct WasmFunctionImport {
     Vector<const char> module;
     Vector<const char> name;
@@ -310,7 +327,7 @@ class V8_EXPORT_PRIVATE WasmModuleBuilder : public ZoneObject {
 
   friend class WasmFunctionBuilder;
   Zone* zone_;
-  ZoneVector<FunctionSig*> signatures_;
+  ZoneVector<Type> types_;
   ZoneVector<WasmFunctionImport> function_imports_;
   ZoneVector<WasmGlobalImport> global_imports_;
   ZoneVector<WasmExport> exports_;
@@ -335,7 +352,7 @@ class V8_EXPORT_PRIVATE WasmModuleBuilder : public ZoneObject {
 };
 
 inline FunctionSig* WasmFunctionBuilder::signature() {
-  return builder_->signatures_[signature_index_];
+  return builder_->types_[signature_index_].sig;
 }
 
 }  // namespace wasm

src/wasm/wasm-objects.cc

@@ -1421,7 +1421,7 @@ Handle<Map> WasmInstanceObject::GetOrCreateStructMap(
   const wasm::StructType* type = module->struct_type(struct_index);
 
   int inobject_properties = 0;
-  DCHECK_LE(kMaxInt - WasmStruct::kHeaderSize, type->total_fields_size());
+  DCHECK_LE(type->total_fields_size(), kMaxInt - WasmStruct::kHeaderSize);
   int instance_size =
       WasmStruct::kHeaderSize + static_cast<int>(type->total_fields_size());
   InstanceType instance_type = WASM_STRUCT_TYPE;

test/cctest/BUILD.gn

@@ -275,6 +275,7 @@ v8_source_set("cctest_sources") {
     "unicode-helpers.h",
     "wasm/test-c-wasm-entry.cc",
     "wasm/test-compilation-cache.cc",
+    "wasm/test-gc.cc",
     "wasm/test-grow-memory.cc",
     "wasm/test-jump-table-assembler.cc",
     "wasm/test-liftoff-inspection.cc",

test/cctest/cctest.status

@@ -467,6 +467,7 @@
   'test-c-wasm-entry/*': [SKIP],
   'test-compilation-cache/*': [SKIP],
   'test-jump-table-assembler/*': [SKIP],
+  'test-gc/*': [SKIP],
   'test-grow-memory/*': [SKIP],
   'test-run-wasm-64/*': [SKIP],
   'test-run-wasm-asmjs/*': [SKIP],

test/cctest/wasm/test-gc.cc

@@ -0,0 +1,100 @@
+// Copyright 2020 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include <stdint.h>
+
+#include "src/utils/utils.h"
+#include "src/utils/vector.h"
+#include "src/wasm/module-decoder.h"
+#include "src/wasm/struct-types.h"
+#include "src/wasm/wasm-engine.h"
+#include "src/wasm/wasm-module-builder.h"
+#include "src/wasm/wasm-module.h"
+#include "src/wasm/wasm-objects-inl.h"
+#include "src/wasm/wasm-opcodes.h"
+#include "test/cctest/cctest.h"
+#include "test/cctest/compiler/value-helper.h"
+#include "test/cctest/wasm/wasm-run-utils.h"
+#include "test/common/wasm/test-signatures.h"
+#include "test/common/wasm/wasm-macro-gen.h"
+#include "test/common/wasm/wasm-module-runner.h"
+
+namespace v8 {
+namespace internal {
+namespace wasm {
+namespace test_gc {
+
+WASM_EXEC_TEST(BasicStruct) {
+  // TODO(7748): Implement support in other tiers.
+  if (execution_tier == ExecutionTier::kLiftoff) return;
+  if (execution_tier == ExecutionTier::kInterpreter) return;
+  TestSignatures sigs;
+  EXPERIMENTAL_FLAG_SCOPE(gc);
+  EXPERIMENTAL_FLAG_SCOPE(anyref);
+  v8::internal::AccountingAllocator allocator;
+  Zone zone(&allocator, ZONE_NAME);
+
+  WasmModuleBuilder* builder = new (&zone) WasmModuleBuilder(&zone);
+  StructType::Builder type_builder(&zone, 2);
+  type_builder.AddField(kWasmI32);
+  type_builder.AddField(kWasmI32);
+  int32_t type_index = builder->AddStructType(type_builder.Build());
+  ValueType kRefTypes[] = {ValueType(ValueType::kRef, type_index)};
+  FunctionSig sig_q_v(1, 0, kRefTypes);
+
+  WasmFunctionBuilder* f = builder->AddFunction(sigs.i_v());
+  f->builder()->AddExport(CStrVector("f"), f);
+  byte f_code[] = {WASM_STRUCT_GET(type_index, 0,
+                                   WASM_STRUCT_NEW(type_index, WASM_I32V(42),
+                                                   WASM_I32V(64))),
+                   kExprEnd};
+  f->EmitCode(f_code, sizeof(f_code));
+
+  WasmFunctionBuilder* g = builder->AddFunction(sigs.i_v());
+  g->builder()->AddExport(CStrVector("g"), g);
+  byte g_code[] = {WASM_STRUCT_GET(type_index, 1,
+                                   WASM_STRUCT_NEW(type_index, WASM_I32V(42),
+                                                   WASM_I32V(64))),
+                   kExprEnd};
+  g->EmitCode(g_code, sizeof(g_code));
+
+  WasmFunctionBuilder* h = builder->AddFunction(&sig_q_v);
+  h->builder()->AddExport(CStrVector("h"), h);
+  byte h_code[] = {WASM_STRUCT_NEW(type_index, WASM_I32V(42), WASM_I32V(64)),
+                   kExprEnd};
+  h->EmitCode(h_code, sizeof(h_code));
+
+  ZoneBuffer buffer(&zone);
+  builder->WriteTo(&buffer);
+
+  Isolate* isolate = CcTest::InitIsolateOnce();
+  HandleScope scope(isolate);
+  testing::SetupIsolateForWasmModule(isolate);
+  ErrorThrower thrower(isolate, "Test");
+  Handle<WasmInstanceObject> instance =
+      testing::CompileAndInstantiateForTesting(
+          isolate, &thrower, ModuleWireBytes(buffer.begin(), buffer.end()))
+          .ToHandleChecked();
+
+  CHECK_EQ(42, testing::CallWasmFunctionForTesting(isolate, instance, &thrower,
+                                                   "f", 0, nullptr));
+  CHECK_EQ(64, testing::CallWasmFunctionForTesting(isolate, instance, &thrower,
+                                                   "g", 0, nullptr));
+
+  // TODO(7748): This uses the JavaScript interface to retrieve the plain
+  // WasmStruct. Once the JS interaction story is settled, this may well
+  // need to be changed.
+  Handle<WasmExportedFunction> h_export =
+      testing::GetExportedFunction(isolate, instance, "h").ToHandleChecked();
+  Handle<Object> undefined = isolate->factory()->undefined_value();
+  Handle<Object> ref_result =
+      Execution::Call(isolate, h_export, undefined, 0, nullptr)
+          .ToHandleChecked();
+  CHECK(ref_result->IsWasmStruct());
+}
+
+}  // namespace test_gc
+}  // namespace wasm
+}  // namespace internal
+}  // namespace v8

test/common/wasm/wasm-macro-gen.h

@@ -409,6 +409,13 @@ inline WasmOpcode LoadStoreOpcodeOf(MachineType type, bool store) {
 
 #define TABLE_ZERO 0
 
+#define WASM_GC_OP(op) kGCPrefix, static_cast<byte>(op)
+#define WASM_STRUCT_NEW(index, ...) \
+  __VA_ARGS__, WASM_GC_OP(kExprStructNew), static_cast<byte>(index)
+#define WASM_STRUCT_GET(typeidx, fieldidx, ...)                        \
+  __VA_ARGS__, WASM_GC_OP(kExprStructGet), static_cast<byte>(typeidx), \
+      static_cast<byte>(fieldidx)
+
 // Pass: sig_index, ...args, func_index
 #define WASM_CALL_INDIRECT(sig_index, ...) \
   __VA_ARGS__, kExprCallIndirect, static_cast<byte>(sig_index), TABLE_ZERO