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importtype.go
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importtype.go
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package wasmer
// #include <wasmer.h>
import "C"
import (
"runtime"
"unsafe"
)
type importTypes struct {
_inner C.wasm_importtype_vec_t
importTypes []*ImportType
}
func newImportTypes(module *Module) *importTypes {
self := &importTypes{}
C.wasm_module_imports(module.inner(), &self._inner)
runtime.SetFinalizer(self, func(self *importTypes) {
self.close()
})
numberOfImportTypes := int(self.inner().size)
types := make([]*ImportType, numberOfImportTypes)
firstImportType := unsafe.Pointer(self.inner().data)
sizeOfImportTypePointer := unsafe.Sizeof(firstImportType)
var currentTypePointer *C.wasm_importtype_t
for nth := 0; nth < numberOfImportTypes; nth++ {
currentTypePointer = *(**C.wasm_importtype_t)(unsafe.Pointer(uintptr(firstImportType) + uintptr(nth)*sizeOfImportTypePointer))
importType := newImportType(currentTypePointer, self)
types[nth] = importType
}
self.importTypes = types
return self
}
func (self *importTypes) inner() *C.wasm_importtype_vec_t {
return &self._inner
}
func (self *importTypes) close() {
runtime.SetFinalizer(self, nil)
C.wasm_importtype_vec_delete(&self._inner)
}
// ImportType is a descriptor for an imported value into a WebAssembly
// module.
type ImportType struct {
_inner *C.wasm_importtype_t
_ownedBy interface{}
}
func newImportType(pointer *C.wasm_importtype_t, ownedBy interface{}) *ImportType {
importType := &ImportType{_inner: pointer, _ownedBy: ownedBy}
if ownedBy == nil {
runtime.SetFinalizer(importType, func(self *ImportType) {
self.Close()
})
}
return importType
}
// NewImportType instantiates a new ImportType with a module name (or
// namespace), a name and an extern type.
//
// Note:️ An extern type is anything implementing IntoExternType:
// FunctionType, GlobalType, MemoryType, TableType.
//
// valueType := NewValueType(I32)
// globalType := NewGlobalType(valueType, CONST)
// importType := NewImportType("ns", "host_global", globalType)
//
func NewImportType(module string, name string, ty IntoExternType) *ImportType {
moduleName := newName(module)
nameName := newName(name)
externType := ty.IntoExternType().inner()
externTypeCopy := C.wasm_externtype_copy(externType)
runtime.KeepAlive(externType)
importType := C.wasm_importtype_new(&moduleName, &nameName, externTypeCopy)
return newImportType(importType, nil)
}
func (self *ImportType) inner() *C.wasm_importtype_t {
return self._inner
}
func (self *ImportType) ownedBy() interface{} {
if self._ownedBy == nil {
return self
}
return self._ownedBy
}
// Module returns the ImportType's module name (or namespace).
//
// valueType := NewValueType(I32)
// globalType := NewGlobalType(valueType, CONST)
// importType := NewImportType("ns", "host_global", globalType)
// _ = importType.Module()
//
func (self *ImportType) Module() string {
byteVec := C.wasm_importtype_module(self.inner())
module := C.GoStringN(byteVec.data, C.int(byteVec.size))
runtime.KeepAlive(self)
return module
}
// Name returns the ImportType's name.
//
// valueType := NewValueType(I32)
// globalType := NewGlobalType(valueType, CONST)
// importType := NewImportType("ns", "host_global", globalType)
// _ = importType.Name()
//
func (self *ImportType) Name() string {
byteVec := C.wasm_importtype_name(self.inner())
name := C.GoStringN(byteVec.data, C.int(byteVec.size))
runtime.KeepAlive(self)
return name
}
// Type returns the ImportType's type as an ExternType.
//
// valueType := NewValueType(I32)
// globalType := NewGlobalType(valueType, CONST)
// importType := NewImportType("ns", "host_global", globalType)
// _ = importType.Type()
//
func (self *ImportType) Type() *ExternType {
ty := C.wasm_importtype_type(self.inner())
runtime.KeepAlive(self)
return newExternType(ty, self.ownedBy())
}
// Force to close the ImportType.
//
// A runtime finalizer is registered on the ImportType, but it is
// possible to force the destruction of the ImportType by calling
// Close manually.
func (self *ImportType) Close() {
runtime.SetFinalizer(self, nil)
C.wasm_importtype_delete(self.inner())
}