Re-land [Wasm-GC] Implement packed types in arrays

https://bugs.webkit.org/show_bug.cgi?id=247576

Reviewed by Justin Michaud.

This patch implements support for packed types (i8, i16) in Wasm GC
arrays. Packed types are represented with new entries in wasm.json and
are only allowed for use in StorageTypes, which are a new kind of type
used for struct and array type definition fields.

Packed structs are not yet allowed with this patch.

Relanded patch fixes an invalid move in the Air generator for non-x86
platforms. It also refactors StorageType use slightly and also
eliminates redundant LLInt opcodes.

* JSTests/wasm/gc/arrays.js:
(testArrayDeclaration):
* JSTests/wasm/gc/packed-arrays.js: Added.
(module):
(check):
(testArrayGetPacked):
(testArrayGetUWithNewCanonPacked):
(testArrayGetSWithNewCanonPacked):
(testTypeMismatch64):
(testTypeMismatchArrayGet):
(testPackedTypeOutOfContext):
(testSetGetTruncate):
(testArraySet):
(testArrayGetUnreachable):
* JSTests/wasm/wasm.json:
* Source/JavaScriptCore/bytecode/BytecodeList.rb:
* Source/JavaScriptCore/wasm/WasmAirIRGeneratorBase.h:
(JSC::Wasm::ExpressionType>::addArrayNewDefault):
(JSC::Wasm::ExpressionType>::addArrayGet):
(JSC::Wasm::ExpressionType>::addStructGet):
(JSC::Wasm::ExpressionType>::addStructSet):
* Source/JavaScriptCore/wasm/WasmB3IRGenerator.cpp:
(JSC::Wasm::B3IRGenerator::emitStructSet):
(JSC::Wasm::B3IRGenerator::pushArrayNew):
(JSC::Wasm::B3IRGenerator::addArrayNew):
(JSC::Wasm::B3IRGenerator::addArrayNewDefault):
(JSC::Wasm::B3IRGenerator::addArrayGet):
(JSC::Wasm::B3IRGenerator::addStructGet):
* Source/JavaScriptCore/wasm/WasmFormat.h:
(JSC::Wasm::isRefType):
(JSC::Wasm::isRefWithRecursiveReference):
(JSC::Wasm::isSubtype):
(JSC::Wasm::isDefaultableType):
* Source/JavaScriptCore/wasm/WasmFunctionParser.h:
(JSC::Wasm::FunctionParser<Context>::parseExpression):
(JSC::Wasm::FunctionParser<Context>::parseUnreachableExpression):
* Source/JavaScriptCore/wasm/WasmLLIntGenerator.cpp:
(JSC::Wasm::LLIntGenerator::addArrayGet):
* Source/JavaScriptCore/wasm/WasmOperations.cpp:
(JSC::Wasm::JSC_DEFINE_JIT_OPERATION):
* Source/JavaScriptCore/wasm/WasmSectionParser.cpp:
(JSC::Wasm::SectionParser::parsePackedType):
(JSC::Wasm::SectionParser::parseStorageType):
(JSC::Wasm::SectionParser::parseStructType):
(JSC::Wasm::SectionParser::parseArrayType):
* Source/JavaScriptCore/wasm/WasmSectionParser.h:
* Source/JavaScriptCore/wasm/WasmSlowPaths.cpp:
(JSC::LLInt::WASM_SLOW_PATH_DECL):
* Source/JavaScriptCore/wasm/WasmTypeDefinition.cpp:
(JSC::Wasm::StructType::dump const):
(JSC::Wasm::StructType::StructType):
(JSC::Wasm::ArrayType::dump const):
(JSC::Wasm::StorageType::dump const):
(JSC::Wasm::computeStructTypeHash):
(JSC::Wasm::computeArrayTypeHash):
(JSC::Wasm::TypeDefinition::replacePlaceholders const):
* Source/JavaScriptCore/wasm/WasmTypeDefinition.h:
(JSC::Wasm::StorageType::is const):
(JSC::Wasm::StorageType::as const):
(JSC::Wasm::StorageType::StorageType):
(JSC::Wasm::StorageType::unpacked const):
(JSC::Wasm::StorageType::elementSize const):
(JSC::Wasm::StorageType::operator== const):
(JSC::Wasm::StorageType::operator!= const):
(JSC::Wasm::StorageType::typeCode const):
(JSC::Wasm::StorageType::index const):
(JSC::Wasm::makeString):
(JSC::Wasm::typeSizeInBytes):
* Source/JavaScriptCore/wasm/generateWasm.py:
(Wasm.__init__):
* Source/JavaScriptCore/wasm/generateWasmOpsHeader.py:
(cppMacro):
(cppMacroPacked):
(packedTypeMacroizer):
* Source/JavaScriptCore/wasm/js/JSWebAssemblyArray.cpp:
(JSC::JSWebAssemblyArray::JSWebAssemblyArray):
(JSC::JSWebAssemblyArray::~JSWebAssemblyArray):
(JSC::JSWebAssemblyArray::visitChildrenImpl):
* Source/JavaScriptCore/wasm/js/JSWebAssemblyArray.h:
* Source/JavaScriptCore/wasm/js/JSWebAssemblyStruct.cpp:
(JSC::JSWebAssemblyStruct::get const):
(JSC::JSWebAssemblyStruct::set):
* Source/JavaScriptCore/wasm/wasm.json:

Canonical link: https://commits.webkit.org/258463@main

JSTests/wasm/gc/arrays.js

@@ -34,7 +34,7 @@ function testArrayDeclaration() {
   assert.throws(
     () => new WebAssembly.Instance(module("\x00\x61\x73\x6d\x01\x00\x00\x00\x01\x84\x80\x80\x80\x00\x01\x5e\xff\x02")),
     WebAssembly.CompileError,
-    "Module doesn't parse at byte 17: can't get array's element Type"
+    "Module doesn't parse at byte 16: can't get array's element Type"
   )
 
   /*