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/* -*- 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 <stdint.h>
#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*> 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<JSObject*> callable;
static_assert(sizeof(GCPtr<JSObject*>) == 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<WasmTagObject*> 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
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