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/// > Note:
/// <https://webassembly.github.io/spec/core/exec/instructions.html#memory-instructions>
extension ExecutionState {
typealias Memarg = Instruction.Memarg
mutating func i32Load(runtime: Runtime, memarg: Memarg) throws {
try memoryLoad(runtime: runtime, memarg: memarg, loadAs: UInt32.self, castToValue: { .i32($0) })
}
mutating func i64Load(runtime: Runtime, memarg: Memarg) throws {
try memoryLoad(runtime: runtime, memarg: memarg, loadAs: UInt64.self, castToValue: { .i64($0) })
}
mutating func f32Load(runtime: Runtime, memarg: Memarg) throws {
try memoryLoad(runtime: runtime, memarg: memarg, loadAs: UInt32.self, castToValue: { .f32($0) })
}
mutating func f64Load(runtime: Runtime, memarg: Memarg) throws {
try memoryLoad(runtime: runtime, memarg: memarg, loadAs: UInt64.self, castToValue: { .f64($0) })
}
mutating func i32Load8S(runtime: Runtime, memarg: Memarg) throws {
try memoryLoad(runtime: runtime, memarg: memarg, loadAs: Int8.self, castToValue: { .init(signed: Int32($0)) })
}
mutating func i32Load8U(runtime: Runtime, memarg: Memarg) throws {
try memoryLoad(runtime: runtime, memarg: memarg, loadAs: UInt8.self, castToValue: { .i32(UInt32($0)) })
}
mutating func i32Load16S(runtime: Runtime, memarg: Memarg) throws {
try memoryLoad(runtime: runtime, memarg: memarg, loadAs: Int16.self, castToValue: { .init(signed: Int32($0)) })
}
mutating func i32Load16U(runtime: Runtime, memarg: Memarg) throws {
try memoryLoad(runtime: runtime, memarg: memarg, loadAs: UInt16.self, castToValue: { .i32(UInt32($0)) })
}
mutating func i64Load8S(runtime: Runtime, memarg: Memarg) throws {
try memoryLoad(runtime: runtime, memarg: memarg, loadAs: Int8.self, castToValue: { .init(signed: Int64($0)) })
}
mutating func i64Load8U(runtime: Runtime, memarg: Memarg) throws {
try memoryLoad(runtime: runtime, memarg: memarg, loadAs: UInt8.self, castToValue: { .i64(UInt64($0)) })
}
mutating func i64Load16S(runtime: Runtime, memarg: Memarg) throws {
try memoryLoad(runtime: runtime, memarg: memarg, loadAs: Int16.self, castToValue: { .init(signed: Int64($0)) })
}
mutating func i64Load16U(runtime: Runtime, memarg: Memarg) throws {
try memoryLoad(runtime: runtime, memarg: memarg, loadAs: UInt16.self, castToValue: { .i64(UInt64($0)) })
}
mutating func i64Load32S(runtime: Runtime, memarg: Memarg) throws {
try memoryLoad(runtime: runtime, memarg: memarg, loadAs: Int32.self, castToValue: { .init(signed: Int64($0)) })
}
mutating func i64Load32U(runtime: Runtime, memarg: Memarg) throws {
try memoryLoad(runtime: runtime, memarg: memarg, loadAs: UInt32.self, castToValue: { .i64(UInt64($0)) })
}
@_transparent
private mutating func memoryLoad<T: FixedWidthInteger>(
runtime: Runtime, memarg: Instruction.Memarg, loadAs _: T.Type = T.self, castToValue: (T) -> Value
) throws {
let moduleInstance = currentModule(store: runtime.store)
let store = runtime.store
let memoryAddress = moduleInstance.memoryAddresses[0]
let memoryInstance = store.memories[memoryAddress]
let i = stack.popValue().asAddressOffset(memoryInstance.limit.isMemory64)
let (address, isOverflow) = memarg.offset.addingReportingOverflow(i)
guard !isOverflow else {
throw Trap.outOfBoundsMemoryAccess
}
let length = UInt64(T.bitWidth) / 8
let (endAddress, isEndOverflow) = address.addingReportingOverflow(length)
guard !isEndOverflow, endAddress <= memoryInstance.data.count else {
throw Trap.outOfBoundsMemoryAccess
}
let loaded = memoryInstance.data.withUnsafeBufferPointer { buffer in
let rawBuffer = UnsafeRawBufferPointer(buffer)
return rawBuffer.loadUnaligned(fromByteOffset: Int(address), as: T.self)
}
stack.push(value: castToValue(loaded))
}
mutating func i32Store(runtime: Runtime, memarg: Memarg) throws {
try memoryStore(runtime: runtime, memarg: memarg, castFromValue: { $0.i32 })
}
mutating func i64Store(runtime: Runtime, memarg: Memarg) throws {
try memoryStore(runtime: runtime, memarg: memarg, castFromValue: { $0.i64 })
}
mutating func f32Store(runtime: Runtime, memarg: Memarg) throws {
try memoryStore(runtime: runtime, memarg: memarg, castFromValue: { $0.f32 })
}
mutating func f64Store(runtime: Runtime, memarg: Memarg) throws {
try memoryStore(runtime: runtime, memarg: memarg, castFromValue: { $0.f64 })
}
mutating func i32Store8(runtime: Runtime, memarg: Memarg) throws {
try memoryStore(runtime: runtime, memarg: memarg, castFromValue: { UInt8(truncatingIfNeeded: $0.i32) })
}
mutating func i32Store16(runtime: Runtime, memarg: Memarg) throws {
try memoryStore(runtime: runtime, memarg: memarg, castFromValue: { UInt16(truncatingIfNeeded: $0.i32) })
}
mutating func i64Store8(runtime: Runtime, memarg: Memarg) throws {
try memoryStore(runtime: runtime, memarg: memarg, castFromValue: { UInt8(truncatingIfNeeded: $0.i64) })
}
mutating func i64Store16(runtime: Runtime, memarg: Memarg) throws {
try memoryStore(runtime: runtime, memarg: memarg, castFromValue: { UInt16(truncatingIfNeeded: $0.i64) })
}
mutating func i64Store32(runtime: Runtime, memarg: Memarg) throws {
try memoryStore(runtime: runtime, memarg: memarg, castFromValue: { UInt32(truncatingIfNeeded: $0.i64) })
}
/// `[type].store[bitWidth]`
@_transparent
private mutating func memoryStore<T: FixedWidthInteger>(runtime: Runtime, memarg: Instruction.Memarg, castFromValue: (Value) -> T) throws {
let moduleInstance = currentModule(store: runtime.store)
let store = runtime.store
let value = stack.popValue()
let memoryAddress = moduleInstance.memoryAddresses[0]
let address: UInt64
let endAddress: UInt64
let length: UInt64
do {
let memoryInstance = store.memories[memoryAddress]
let i = stack.popValue().asAddressOffset(memoryInstance.limit.isMemory64)
var isOverflow: Bool
(address, isOverflow) = memarg.offset.addingReportingOverflow(i)
guard !isOverflow else {
throw Trap.outOfBoundsMemoryAccess
}
length = UInt64(T.bitWidth) / 8
(endAddress, isOverflow) = address.addingReportingOverflow(length)
guard !isOverflow, endAddress <= memoryInstance.data.count else {
throw Trap.outOfBoundsMemoryAccess
}
}
let toStore = castFromValue(value)
store.memories[memoryAddress].data.withUnsafeMutableBufferPointer { buffer in
let rawBuffer = UnsafeMutableRawBufferPointer(buffer)
rawBuffer.baseAddress!.advanced(by: Int(address)).bindMemory(to: T.self, capacity: 1).pointee = toStore.littleEndian
}
}
mutating func memorySize(runtime: Runtime) {
let moduleInstance = currentModule(store: runtime.store)
let store = runtime.store
let memoryAddress = moduleInstance.memoryAddresses[0]
let memoryInstance = store.memories[memoryAddress]
let pageCount = memoryInstance.data.count / MemoryInstance.pageSize
stack.push(value: memoryInstance.limit.isMemory64 ? .i64(UInt64(pageCount)) : .i32(UInt32(pageCount)))
}
mutating func memoryGrow(runtime: Runtime) throws {
let moduleInstance = currentModule(store: runtime.store)
let store = runtime.store
let memoryAddress = moduleInstance.memoryAddresses[0]
try store.withMemory(at: memoryAddress) { memoryInstance in
let isMemory64 = memoryInstance.limit.isMemory64
let value = stack.popValue()
let pageCount: UInt64
switch (isMemory64, value) {
case let (true, .i64(value)):
pageCount = value
case let (false, .i32(value)):
pageCount = UInt64(value)
default:
throw Trap.stackValueTypesMismatch(
expected: isMemory64 ? .i64 : .i32, actual: value.type
)
}
let oldPageCount = memoryInstance.grow(by: Int(pageCount))
stack.push(value: oldPageCount)
}
}
mutating func memoryInit(runtime: Runtime, dataIndex: DataIndex) throws {
let moduleInstance = currentModule(store: runtime.store)
let store = runtime.store
let memoryAddress = moduleInstance.memoryAddresses[0]
try store.withMemory(at: memoryAddress) { memoryInstance in
let dataAddress = moduleInstance.dataAddresses[Int(dataIndex)]
let dataInstance = store.datas[dataAddress]
let copyCounter = stack.popValue().i32
let sourceIndex = stack.popValue().i32
let destinationIndex = stack.popValue().asAddressOffset(memoryInstance.limit.isMemory64)
guard copyCounter > 0 else { return }
guard
!sourceIndex.addingReportingOverflow(copyCounter).overflow
&& !destinationIndex.addingReportingOverflow(UInt64(copyCounter)).overflow
&& memoryInstance.data.count >= destinationIndex + UInt64(copyCounter)
&& dataInstance.data.count >= sourceIndex + copyCounter
else {
throw Trap.outOfBoundsMemoryAccess
}
// FIXME: benchmark if using `replaceSubrange` is faster than this loop
for i in 0..<copyCounter {
memoryInstance.data[Int(destinationIndex + UInt64(i))] =
dataInstance.data[Int(sourceIndex + i)]
}
}
}
mutating func memoryDataDrop(runtime: Runtime, dataIndex: DataIndex) {
let moduleInstance = currentModule(store: runtime.store)
let store = runtime.store
let dataAddress = moduleInstance.dataAddresses[Int(dataIndex)]
store.datas[dataAddress] = DataInstance(data: [])
}
mutating func memoryCopy(runtime: Runtime) throws {
let moduleInstance = currentModule(store: runtime.store)
let store = runtime.store
let memoryAddress = moduleInstance.memoryAddresses[0]
try store.withMemory(at: memoryAddress) { memoryInstance in
let copyCounter = stack.popValue().i32
let sourceIndex = stack.popValue().i32
let destinationIndex = stack.popValue().i32
guard copyCounter > 0 else { return }
guard
!sourceIndex.addingReportingOverflow(copyCounter).overflow
&& !destinationIndex.addingReportingOverflow(copyCounter).overflow
&& memoryInstance.data.count >= destinationIndex + copyCounter
&& memoryInstance.data.count >= sourceIndex + copyCounter
else {
throw Trap.outOfBoundsMemoryAccess
}
if destinationIndex <= sourceIndex {
for i in 0..<copyCounter {
memoryInstance.data[Int(destinationIndex + i)] = memoryInstance.data[Int(sourceIndex + i)]
}
} else {
for i in 1...copyCounter {
memoryInstance.data[Int(destinationIndex + copyCounter - i)] = memoryInstance.data[Int(sourceIndex + copyCounter - i)]
}
}
}
}
mutating func memoryFill(runtime: Runtime) throws {
let moduleInstance = currentModule(store: runtime.store)
let store = runtime.store
let memoryAddress = moduleInstance.memoryAddresses[0]
try store.withMemory(at: memoryAddress) { memoryInstance in
let copyCounter = Int(stack.popValue().i32)
let value = stack.popValue()
let destinationIndex = Int(stack.popValue().i32)
guard
!destinationIndex.addingReportingOverflow(copyCounter).overflow
&& memoryInstance.data.count >= destinationIndex + copyCounter
else {
throw Trap.outOfBoundsMemoryAccess
}
memoryInstance.data.replaceSubrange(
destinationIndex..<destinationIndex + copyCounter,
with: [UInt8](repeating: value.bytes![0], count: copyCounter)
)
}
}
}
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