From 36d22d82aa202bb199967e9512281e9a53db42c9 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 21:33:14 +0200 Subject: Adding upstream version 115.7.0esr. Signed-off-by: Daniel Baumann --- js/src/wasm/WasmInstanceData.h | 137 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 137 insertions(+) create mode 100644 js/src/wasm/WasmInstanceData.h (limited to 'js/src/wasm/WasmInstanceData.h') diff --git a/js/src/wasm/WasmInstanceData.h b/js/src/wasm/WasmInstanceData.h new file mode 100644 index 0000000000..b1be3f02a2 --- /dev/null +++ b/js/src/wasm/WasmInstanceData.h @@ -0,0 +1,137 @@ +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- + * vim: set ts=8 sts=2 et sw=2 tw=80: + * + * Copyright 2021 Mozilla Foundation + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +#ifndef wasm_instance_data_h +#define wasm_instance_data_h + +#include + +#include "NamespaceImports.h" + +#include "gc/Allocator.h" +#include "gc/Pretenuring.h" +#include "js/Utility.h" +#include "wasm/WasmInstance.h" +#include "wasm/WasmTypeDecls.h" + +namespace js { +namespace wasm { + +// ExportArg holds the unboxed operands to the wasm entry trampoline which can +// be called through an ExportFuncPtr. + +struct ExportArg { + uint64_t lo; + uint64_t hi; +}; + +using ExportFuncPtr = int32_t (*)(ExportArg*, Instance*); + +// TypeDefInstanceData describes the runtime information associated with a +// module's type definition. This is accessed directly from JIT code and the +// Instance. + +struct TypeDefInstanceData { + TypeDefInstanceData() + : typeDef(nullptr), + superTypeVector(nullptr), + shape(nullptr), + clasp(nullptr), + allocKind(gc::AllocKind::LIMIT) {} + + // The canonicalized pointer to this type definition. This is kept alive by + // the type context associated with the instance. + const wasm::TypeDef* typeDef; + + // The supertype vector for this type definition. This is also kept alive + // by the type context associated with the instance. + // + const wasm::SuperTypeVector* superTypeVector; + + // The remaining fields are only meaningful for, and used by, structs and + // arrays. + GCPtr shape; + const JSClass* clasp; + // The allocation site for GC types. This is used for pre-tenuring. + gc::AllocSite allocSite; + gc::AllocKind allocKind; +}; + +// FuncImportInstanceData describes the region of wasm global memory allocated +// in the instance's thread-local storage for a function import. This is +// accessed directly from JIT code and mutated by Instance as exits become +// optimized and deoptimized. + +struct FuncImportInstanceData { + // The code to call at an import site: a wasm callee, a thunk into C++, or a + // thunk into JIT code. + void* code; + + // The callee's Instance pointer, which must be loaded to InstanceReg + // (along with any pinned registers) before calling 'code'. + Instance* instance; + + // The callee function's realm. + JS::Realm* realm; + + // A GC pointer which keeps the callee alive and is used to recover import + // values for lazy table initialization. + GCPtr callable; + static_assert(sizeof(GCPtr) == sizeof(void*), "for JIT access"); +}; + +// TableInstanceData describes the region of wasm global memory allocated in the +// instance's thread-local storage which is accessed directly from JIT code +// to bounds-check and index the table. + +struct TableInstanceData { + // Length of the table in number of elements (not bytes). + uint32_t length; + + // Pointer to the array of elements (which can have various representations). + // For tables of anyref this is null. + // For tables of functions, this is a pointer to the array of code pointers. + void* elements; +}; + +// TagInstanceData describes the instance state associated with a tag. + +struct TagInstanceData { + GCPtr object; +}; + +// Table element for TableRepr::Func which carries both the code pointer and +// a instance pointer (and thus anything reachable through the instance). + +struct FunctionTableElem { + // The code to call when calling this element. The table ABI is the system + // ABI with the additional ABI requirements that: + // - InstanceReg and any pinned registers have been loaded appropriately + // - if this is a heterogeneous table that requires a signature check, + // WasmTableCallSigReg holds the signature id. + void* code; + + // The pointer to the callee's instance's Instance. This must be loaded into + // InstanceReg before calling 'code'. + Instance* instance; +}; + +} // namespace wasm +} // namespace js + +#endif // wasm_instance_data_h -- cgit v1.2.3