package wasm

import (
	
	
	

	
	
)

// FailIfClosed returns a sys.ExitError if CloseWithExitCode was called.
func ( *ModuleInstance) () ( error) {
	if  := .Closed.Load();  != 0 {
		switch  & exitCodeFlagMask {
		case exitCodeFlagResourceClosed:
		case exitCodeFlagResourceNotClosed:
			// This happens when this module is closed asynchronously in CloseModuleOnCanceledOrTimeout,
			// and the closure of resources have been deferred here.
			_ = .ensureResourcesClosed(context.Background())
		}
		return sys.NewExitError(uint32( >> 32)) // Unpack the high order bits as the exit code.
	}
	return nil
}

// CloseModuleOnCanceledOrTimeout take a context `ctx`, which might be a Cancel or Timeout context,
// and spawns the Goroutine to check the context is canceled ot deadline exceeded. If it reaches
// one of the conditions, it sets the appropriate exit code.
//
// Callers of this function must invoke the returned context.CancelFunc to release the spawned Goroutine.
func ( *ModuleInstance) ( context.Context) context.CancelFunc {
	// Creating an empty channel in this case is a bit more efficient than
	// creating a context.Context and canceling it with the same effect. We
	// really just need to be notified when to stop listening to the users
	// context. Closing the channel will unblock the select in the goroutine
	// causing it to return an stop listening to ctx.Done().
	 := make(chan struct{})
	go .closeModuleOnCanceledOrTimeout(, )
	return func() { close() }
}

// closeModuleOnCanceledOrTimeout is extracted from CloseModuleOnCanceledOrTimeout for testing.
func ( *ModuleInstance) ( context.Context,  <-chan struct{}) {
	select {
	case <-.Done():
		select {
		case <-:
			// In some cases by the time this goroutine is scheduled, the caller
			// has already closed both the context and the cancelChan. In this
			// case go will randomize which branch of the outer select to enter
			// and we don't want to close the module.
		default:
			// This is the same logic as CloseWithCtxErr except this calls closeWithExitCodeWithoutClosingResource
			// so that we can defer the resource closure in FailIfClosed.
			switch {
			case errors.Is(.Err(), context.Canceled):
				// TODO: figure out how to report error here.
				_ = .closeWithExitCodeWithoutClosingResource(sys.ExitCodeContextCanceled)
			case errors.Is(.Err(), context.DeadlineExceeded):
				// TODO: figure out how to report error here.
				_ = .closeWithExitCodeWithoutClosingResource(sys.ExitCodeDeadlineExceeded)
			}
		}
	case <-:
	}
}

// CloseWithCtxErr closes the module with an exit code based on the type of
// error reported by the context.
//
// If the context's error is unknown or nil, the module does not close.
func ( *ModuleInstance) ( context.Context) {
	switch {
	case errors.Is(.Err(), context.Canceled):
		// TODO: figure out how to report error here.
		_ = .CloseWithExitCode(, sys.ExitCodeContextCanceled)
	case errors.Is(.Err(), context.DeadlineExceeded):
		// TODO: figure out how to report error here.
		_ = .CloseWithExitCode(, sys.ExitCodeDeadlineExceeded)
	}
}

// Name implements the same method as documented on api.Module
func ( *ModuleInstance) () string {
	return .ModuleName
}

// String implements the same method as documented on api.Module
func ( *ModuleInstance) () string {
	return fmt.Sprintf("Module[%s]", .Name())
}

// Close implements the same method as documented on api.Module.
func ( *ModuleInstance) ( context.Context) ( error) {
	return .CloseWithExitCode(, 0)
}

// CloseWithExitCode implements the same method as documented on api.Module.
func ( *ModuleInstance) ( context.Context,  uint32) ( error) {
	if !.setExitCode(, exitCodeFlagResourceClosed) {
		return nil // not an error to have already closed
	}
	_ = .s.deleteModule()
	return .ensureResourcesClosed()
}

// IsClosed implements the same method as documented on api.Module.
func ( *ModuleInstance) () bool {
	return .Closed.Load() != 0
}

func ( *ModuleInstance) ( uint32) ( error) {
	if !.setExitCode(, exitCodeFlagResourceNotClosed) {
		return nil // not an error to have already closed
	}
	_ = .s.deleteModule()
	return nil
}

// closeWithExitCode is the same as CloseWithExitCode besides this doesn't delete it from Store.moduleList.
func ( *ModuleInstance) ( context.Context,  uint32) ( error) {
	if !.setExitCode(, exitCodeFlagResourceClosed) {
		return nil // not an error to have already closed
	}
	return .ensureResourcesClosed()
}

type exitCodeFlag = uint64

const exitCodeFlagMask = 0xff

const (
	// exitCodeFlagResourceClosed indicates that the module was closed and resources were already closed.
	exitCodeFlagResourceClosed = 1 << iota
	// exitCodeFlagResourceNotClosed indicates that the module was closed while resources are not closed yet.
	exitCodeFlagResourceNotClosed
)

func ( *ModuleInstance) ( uint32,  exitCodeFlag) bool {
	 :=  | uint64()<<32 // Store exitCode as high-order bits.
	return .Closed.CompareAndSwap(0, )
}

// ensureResourcesClosed ensures that resources assigned to ModuleInstance is released.
// Only one call will happen per module, due to external atomic guards on Closed.
func ( *ModuleInstance) ( context.Context) ( error) {
	if  := .CloseNotifier;  != nil { // experimental
		.CloseNotify(, uint32(.Closed.Load()>>32))
		.CloseNotifier = nil
	}

	if  := .Sys;  != nil { // nil if from HostModuleBuilder
		 = .FS().Close()
		.Sys = nil
	}

	if  := .MemoryInstance;  != nil {
		if .expBuffer != nil {
			.expBuffer.Free()
			.expBuffer = nil
		}
	}

	if .CodeCloser != nil {
		if  := .CodeCloser.Close();  == nil {
			 = 
		}
		.CodeCloser = nil
	}
	return 
}

// Memory implements the same method as documented on api.Module.
func ( *ModuleInstance) () api.Memory {
	return .MemoryInstance
}

// ExportedMemory implements the same method as documented on api.Module.
func ( *ModuleInstance) ( string) api.Memory {
	,  := .getExport(, ExternTypeMemory)
	if  != nil {
		return nil
	}
	// We Assume that we have at most one memory.
	return .MemoryInstance
}

// ExportedMemoryDefinitions implements the same method as documented on
// api.Module.
func ( *ModuleInstance) () map[string]api.MemoryDefinition {
	// Special case as we currently only support one memory.
	if  := .MemoryInstance;  != nil {
		// Now, find out if it is exported
		for ,  := range .Exports {
			if .Type == ExternTypeMemory {
				return map[string]api.MemoryDefinition{: .definition}
			}
		}
	}
	return map[string]api.MemoryDefinition{}
}

// ExportedFunction implements the same method as documented on api.Module.
func ( *ModuleInstance) ( string) api.Function {
	,  := .getExport(, ExternTypeFunc)
	if  != nil {
		return nil
	}
	return .Engine.NewFunction(.Index)
}

// ExportedFunctionDefinitions implements the same method as documented on
// api.Module.
func ( *ModuleInstance) () map[string]api.FunctionDefinition {
	 := map[string]api.FunctionDefinition{}
	for ,  := range .Exports {
		if .Type == ExternTypeFunc {
			[] = .Source.FunctionDefinition(.Index)
		}
	}
	return 
}

// GlobalVal is an internal hack to get the lower 64 bits of a global.
func ( *ModuleInstance) ( Index) uint64 {
	return .Globals[].Val
}

// ExportedGlobal implements the same method as documented on api.Module.
func ( *ModuleInstance) ( string) api.Global {
	,  := .getExport(, ExternTypeGlobal)
	if  != nil {
		return nil
	}
	 := .Globals[.Index]
	if .Type.Mutable {
		return mutableGlobal{g: }
	}
	return constantGlobal{g: }
}

// NumGlobal implements experimental.InternalModule.
func ( *ModuleInstance) () int {
	return len(.Globals)
}

// Global implements experimental.InternalModule.
func ( *ModuleInstance) ( int) api.Global {
	return constantGlobal{g: .Globals[]}
}