mirror of
https://github.com/mappu/miqt.git
synced 2024-12-23 01:18:37 +00:00
668 lines
19 KiB
Go
668 lines
19 KiB
Go
package main
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import (
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"C"
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"fmt"
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"go/format"
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"log"
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"sort"
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"strings"
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)
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func goReservedWord(s string) bool {
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switch s {
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case "default", "const", "func", "var", "type", "len", "new", "copy", "import", "range", "string", "map", "int", "select",
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"ret": // not a language-reserved word, but a binding-reserved word
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return true
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default:
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return false
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}
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}
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func (p CppParameter) RenderTypeGo() string {
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if p.Pointer && p.ParameterType == "char" {
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return "string"
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}
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if p.ParameterType == "QString" {
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return "string"
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}
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if t, ok := p.QListOf(); ok {
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return "[]" + t.RenderTypeGo()
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}
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if t, ok := p.QSetOf(); ok {
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return "map[" + t.RenderTypeGo() + "]struct{}"
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}
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ret := ""
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if p.ByRef || p.Pointer {
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ret += "*"
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}
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switch p.ParameterType {
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case "char", "qint8", "signed char", "unsigned char", "uchar", "quint8":
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ret += "byte" // Strictly speaking, Go byte is unsigned and char may be signed
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case "short", "qint16":
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ret += "int16"
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case "ushort", "quint16", "unsigned short":
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ret += "uint16"
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case "long":
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// Windows ILP32 - 32-bits
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// Linux LP64 - 64-bits
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if C.sizeof_long == 4 {
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ret += "int32"
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} else {
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ret += "int64"
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}
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case "ulong", "unsigned long":
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if C.sizeof_long == 4 {
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ret += "uint32"
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} else {
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ret += "uint64"
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}
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case "unsigned int":
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ret += "uint"
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case "qint32":
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ret += "int32"
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case "quint32":
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ret += "uint32"
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case "qlonglong", "qint64", "long long":
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ret += "int64"
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case "qulonglong", "quint64", "unsigned long long":
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ret += "uint64"
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case "float":
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ret += "float32"
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case "double", "qreal":
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ret += "float64"
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case "qsizetype", "size_t", "qptrdiff", "ptrdiff_t":
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if C.sizeof_size_t == 4 {
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ret += "uint32"
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} else {
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ret += "uint64"
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}
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case "qintptr", "uintptr_t", "intptr_t", "quintptr", "QIntegerForSizeof<void *>::Unsigned", "QIntegerForSizeof<void *>::Signed":
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ret += "uintptr"
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default:
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if ft, ok := p.QFlagsOf(); ok {
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ret += cabiClassName(ft.ParameterType)
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} else if p.IsKnownEnum() {
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ret += cabiClassName(p.ParameterType)
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} else if strings.Contains(p.ParameterType, `::`) {
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// Inner class
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ret += cabiClassName(p.ParameterType)
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} else {
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// Do not transform this type
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ret += p.ParameterType
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}
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}
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return ret // ignore const
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}
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func (p CppParameter) parameterTypeCgo() string {
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if p.ParameterType == "QString" {
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return "*C.struct_miqt_string"
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}
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if _, ok := p.QListOf(); ok {
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return "*C.struct_miqt_array"
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}
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if _, ok := p.QSetOf(); ok {
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return "*C.struct_miqt_array"
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}
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tmp := strings.Replace(p.RenderTypeCabi(), `*`, "", -1)
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if strings.HasPrefix(tmp, "const ") {
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tmp = tmp[6:] // Constness doesn't survive the CABI boundary
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}
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if strings.HasPrefix(tmp, "unsigned ") {
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tmp = "u" + tmp[9:] // Cgo uses uchar, uint instead of full name
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}
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if strings.HasPrefix(tmp, "signed ") {
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tmp = "s" + tmp[7:] // Cgo uses schar
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}
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tmp = strings.Replace(tmp, `long long`, `longlong`, -1)
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tmp = "C." + strings.Replace(tmp, " ", "_", -1)
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if p.QtClassType() || p.Pointer || p.ByRef {
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return "*" + tmp
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} else {
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return tmp
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}
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}
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func emitParametersGo(params []CppParameter) string {
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tmp := make([]string, 0, len(params))
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skipNext := false
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for i, p := range params {
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if IsArgcArgv(params, i) {
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skipNext = true
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tmp = append(tmp, "args []string")
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} else if skipNext {
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// Skip this parameter, already handled
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skipNext = false
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} else {
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// Ordinary parameter
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tmp = append(tmp, p.ParameterName+" "+p.RenderTypeGo())
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}
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}
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return strings.Join(tmp, ", ")
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}
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type goFileState struct {
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imports map[string]struct{}
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}
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func (gfs *goFileState) emitParametersGo2CABIForwarding(m CppMethod) (preamble string, forwarding string) {
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tmp := make([]string, 0, len(m.Parameters)+2)
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if !m.IsStatic {
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tmp = append(tmp, "this.h")
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}
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skipNext := false
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for i, p := range m.Parameters {
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if IsArgcArgv(m.Parameters, i) {
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skipNext = true
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// QApplication constructor. Convert 'args' into Qt's wanted types
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// Qt has a warning in the docs saying these pointers must be valid
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// for the entire lifetype of QApplication, so, malloc + never free
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// This transformation only affects the Go side. The CABI side is
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// projected naturally
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preamble += "// Convert []string to long-lived int& argc, char** argv, never call free()\n"
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preamble += "argc := (*C.int)(C.malloc(8))\n"
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preamble += "*argc = C.int(len(args))\n"
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preamble += "argv := (*[0xffff]*C.char)(C.malloc(C.size_t(8 * len(args))))\n"
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preamble += "for i := range args {\n"
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preamble += "argv[i] = C.CString(args[i])\n"
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preamble += "}\n"
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tmp = append(tmp, "argc, &argv[0]")
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} else if skipNext {
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// Skip this parameter, already handled
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skipNext = false
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} else {
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addPreamble, rvalue := gfs.emitParameterGo2CABIForwarding(p)
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preamble += addPreamble
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tmp = append(tmp, rvalue)
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}
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}
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return preamble, strings.Join(tmp, ", ")
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}
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func (gfs *goFileState) emitParameterGo2CABIForwarding(p CppParameter) (preamble string, rvalue string) {
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nameprefix := makeNamePrefix(p.ParameterName)
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if p.ParameterType == "QString" {
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// Go: convert string -> miqt_string*
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// CABI: convert miqt_string* -> real QString
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preamble += nameprefix + "_ms := miqt_strdupg(" + p.ParameterName + ")\n"
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preamble += "defer C.free(" + nameprefix + "_ms)\n"
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rvalue = "(*C.struct_miqt_string)(" + nameprefix + "_ms)"
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} else if listType, ok := p.QListOf(); ok {
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// QList<T>
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// Go: convert T[] -> t* and len
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// CABI: create a real QList<>
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gfs.imports["runtime"] = struct{}{}
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gfs.imports["unsafe"] = struct{}{}
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preamble += "// For the C ABI, malloc a C array of raw pointers\n"
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preamble += nameprefix + "_CArray := (*[0xffff]" + listType.parameterTypeCgo() + ")(C.malloc(C.size_t(8 * len(" + p.ParameterName + "))))\n"
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preamble += "defer C.free(unsafe.Pointer(" + nameprefix + "_CArray))\n"
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preamble += "for i := range " + p.ParameterName + "{\n"
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listType.ParameterName = p.ParameterName + "[i]"
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addPreamble, innerRvalue := gfs.emitParameterGo2CABIForwarding(listType)
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preamble += addPreamble
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preamble += nameprefix + "_CArray[i] = " + innerRvalue + "\n"
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preamble += "}\n"
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preamble += p.ParameterName + "_ma := &C.struct_miqt_array{len: C.size_t(len(" + p.ParameterName + ")), data: unsafe.Pointer(" + nameprefix + "_CArray)}\n"
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preamble += "defer runtime.KeepAlive(unsafe.Pointer(" + nameprefix + "_ma))\n"
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rvalue = p.ParameterName + "_ma"
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} else if _, ok := p.QSetOf(); ok {
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panic("QSet<> arguments are not yet implemented") // n.b. doesn't seem to exist in QtCore/QtGui/QtWidgets at all
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} else if p.Pointer && p.ParameterType == "char" {
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// Single char* argument
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gfs.imports["unsafe"] = struct{}{}
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preamble += nameprefix + "_Cstring := C.CString(" + p.ParameterName + ")\n"
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preamble += "defer C.free(unsafe.Pointer(" + nameprefix + "_Cstring))\n"
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rvalue = nameprefix + "_Cstring"
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} else if /*(p.Pointer || p.ByRef) &&*/ p.QtClassType() {
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// The C++ type is a pointer to Qt class
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// We want our functions to accept the Go wrapper type, and forward as cPointer()
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rvalue = p.ParameterName + ".cPointer()"
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} else if p.IntType() || p.IsFlagType() || p.IsKnownEnum() || p.ParameterType == "bool" {
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if p.Pointer || p.ByRef {
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gfs.imports["unsafe"] = struct{}{}
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rvalue = "(" + p.parameterTypeCgo() + ")(unsafe.Pointer(" + p.ParameterName + "))" // n.b. This may not work if the integer type conversion was wrong
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} else {
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rvalue = "(" + p.parameterTypeCgo() + ")(" + p.ParameterName + ")"
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}
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} else {
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// Default
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rvalue = p.ParameterName
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}
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return preamble, rvalue
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}
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func (gfs *goFileState) emitCabiToGo(assignExpr string, rt CppParameter, rvalue string) string {
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shouldReturn := "return "
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afterword := ""
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namePrefix := makeNamePrefix(rt.ParameterName)
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if rt.ParameterType == "void" && !rt.Pointer {
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shouldReturn = ""
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} else if rt.ParameterType == "void" && rt.Pointer {
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// ...
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} else if rt.ParameterType == "char" && rt.Pointer {
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// Qt functions normally return QString - anything returning char*
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// is something like QByteArray.Data() where it returns an unsafe
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// internal pointer
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gfs.imports["unsafe"] = struct{}{}
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shouldReturn = namePrefix + "_ret := "
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afterword += assignExpr + " (unsafe.Pointer)(" + namePrefix + "_ret)\n"
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} else if rt.ParameterType == "QString" {
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gfs.imports["unsafe"] = struct{}{}
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shouldReturn = "var " + namePrefix + "_ms *C.struct_miqt_string = "
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afterword += namePrefix + "_ret := C.GoStringN(&" + namePrefix + "_ms.data, C.int(int64(" + namePrefix + "_ms.len)))\n"
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afterword += "C.free(unsafe.Pointer(" + namePrefix + "_ms))\n"
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afterword += assignExpr + namePrefix + "_ret"
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} else if t, ok := rt.QListOf(); ok {
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gfs.imports["unsafe"] = struct{}{}
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shouldReturn = "var " + namePrefix + "_ma *C.struct_miqt_array = "
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afterword += namePrefix + "_ret := make([]" + t.RenderTypeGo() + ", int(" + namePrefix + "_ma.len))\n"
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afterword += namePrefix + "_outCast := (*[0xffff]" + t.parameterTypeCgo() + ")(unsafe.Pointer(" + namePrefix + "_ma.data)) // hey ya\n"
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afterword += "for i := 0; i < int(" + namePrefix + "_ma.len); i++ {\n"
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afterword += gfs.emitCabiToGo(namePrefix+"_ret[i] = ", t, namePrefix+"_outCast[i]")
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afterword += "}\n"
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afterword += "C.free(unsafe.Pointer(" + namePrefix + "_ma))\n"
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afterword += assignExpr + " " + namePrefix + "_ret\n"
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} else if t, ok := rt.QSetOf(); ok {
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gfs.imports["unsafe"] = struct{}{}
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shouldReturn = "var " + namePrefix + "_ma *C.struct_miqt_array = "
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afterword += namePrefix + "_ret := make(map[" + t.RenderTypeGo() + "]struct{}, int(" + namePrefix + "_ma.len))\n"
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afterword += namePrefix + "_outCast := (*[0xffff]" + t.parameterTypeCgo() + ")(unsafe.Pointer(" + namePrefix + "_ma.data)) // hey ya\n"
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afterword += "for i := 0; i < int(" + namePrefix + "_ma.len); i++ {\n"
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afterword += gfs.emitCabiToGo(namePrefix+"_element := ", t, namePrefix+"_outCast[i]") + "\n"
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afterword += namePrefix + "_ret[" + namePrefix + "_element] = struct{}{}\n"
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afterword += "}\n"
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afterword += "C.free(unsafe.Pointer(" + namePrefix + "_ma))\n"
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afterword += assignExpr + " " + namePrefix + "_ret\n"
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} else if rt.QtClassType() {
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// Construct our Go type based on this inner CABI type
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shouldReturn = "" + namePrefix + "_ret := "
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if rt.Pointer || rt.ByRef {
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gfs.imports["unsafe"] = struct{}{}
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return assignExpr + " new" + cabiClassName(rt.ParameterType) + "_U(unsafe.Pointer(" + rvalue + "))"
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} else {
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// This is return by value, but CABI has new'd it into a
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// heap type for us
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// To preserve Qt's approximate semantics, add a runtime
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// finalizer to automatically Delete once the type goes out
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// of Go scope
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afterword += namePrefix + "_goptr := new" + cabiClassName(rt.ParameterType) + "(" + namePrefix + "_ret)\n"
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afterword += namePrefix + "_goptr.GoGC() // Qt uses pass-by-value semantics for this type. Mimic with finalizer\n"
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// If this is a function return, we have converted value-returned Qt types to pointers
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// If this is a slot return, we haven't
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// TODO standardize this
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if strings.Contains(assignExpr, `return`) {
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afterword += assignExpr + "" + namePrefix + "_goptr\n"
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} else {
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afterword += assignExpr + " *" + namePrefix + "_goptr\n"
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}
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}
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} else if rt.IntType() || rt.IsKnownEnum() || rt.IsFlagType() || rt.ParameterType == "bool" || rt.QtCppOriginalType != nil {
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// Need to cast Cgo type to Go int type
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// Optimize assignment to avoid temporary
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return assignExpr + "(" + rt.RenderTypeGo() + ")(" + rvalue + ")\n"
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}
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return shouldReturn + " " + rvalue + "\n" + afterword
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}
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func emitGo(src *CppParsedHeader, headerName string) (string, error) {
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ret := strings.Builder{}
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ret.WriteString(`package qt
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/*
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#include "gen_` + headerName + `"
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#include <stdlib.h>
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*/
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import "C"
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%%_IMPORTLIBS_%%
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`)
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gfs := goFileState{
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imports: map[string]struct{}{},
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}
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// Check if short-named enums are allowed.
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// We only allow short names if there are no conflicts anywhere in the whole
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// file. This doesn't fully defend against cross-file conflicts but those
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// should hopefully be rare enough
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preventShortNames := map[string]struct{}{}
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{
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nameTest := map[string]string{}
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nextEnum:
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for _, e := range src.Enums {
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for _, ee := range e.Entries {
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if other, ok := nameTest[ee.EntryName]; ok {
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preventShortNames[e.EnumName] = struct{}{}
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preventShortNames[other] = struct{}{}
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continue nextEnum
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}
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nameTest[ee.EntryName] = e.EnumName
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}
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}
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}
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for _, e := range src.Enums {
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if e.EnumName == "" {
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continue // Removed by transformRedundant AST pass
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}
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// Fully qualified name of the enum itself
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goEnumName := cabiClassName(e.EnumName)
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// Shorter name, so that enum elements are reachable from the surrounding
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// namespace
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goEnumShortName := goEnumName
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if _, ok := preventShortNames[e.EnumName]; !ok {
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// Strip back one single :: pair from the generated variable name
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nameParts := strings.Split(e.EnumName, `::`)
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if len(nameParts) > 1 {
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nameParts = nameParts[0 : len(nameParts)-1]
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}
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goEnumShortName = cabiClassName(strings.Join(nameParts, `::`))
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}
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ret.WriteString(`
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type ` + goEnumName + ` ` + e.UnderlyingType.RenderTypeGo() + `
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`)
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if len(e.Entries) > 0 {
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ret.WriteString("const (\n")
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for _, ee := range e.Entries {
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ret.WriteString(titleCase(cabiClassName(goEnumShortName+"::"+ee.EntryName)) + " " + goEnumName + " = " + ee.EntryValue + "\n")
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}
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ret.WriteString("\n)\n\n")
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}
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}
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for _, c := range src.Classes {
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goClassName := cabiClassName(c.ClassName)
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ret.WriteString(`
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type ` + goClassName + ` struct {
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h *C.` + goClassName + `
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`)
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// Embed all inherited types to directly allow calling inherited methods
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for _, base := range c.Inherits {
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ret.WriteString("*" + base + "\n")
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}
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ret.WriteString(`
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}
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func (this *` + goClassName + `) cPointer() *C.` + goClassName + ` {
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if this == nil {
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return nil
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}
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return this.h
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}
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`)
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localInit := "h: h"
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for _, base := range c.Inherits {
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gfs.imports["unsafe"] = struct{}{}
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localInit += ", " + base + ": new" + cabiClassName(base) + "_U(unsafe.Pointer(h))"
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}
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ret.WriteString(`
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func new` + goClassName + `(h *C.` + goClassName + `) *` + goClassName + ` {
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if h == nil {
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return nil
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}
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return &` + goClassName + `{` + localInit + `}
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}
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`)
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// CGO types only exist within the same Go file, so other Go files can't
|
|
// call this same private ctor function, unless it goes through unsafe.Pointer{}.
|
|
// This is probably because C types can possibly violate the ODR whereas
|
|
// that never happens in Go's type system.
|
|
gfs.imports["unsafe"] = struct{}{}
|
|
ret.WriteString(`
|
|
func new` + goClassName + `_U(h unsafe.Pointer) *` + goClassName + ` {
|
|
return new` + goClassName + `( (*C.` + goClassName + `)(h) )
|
|
}
|
|
|
|
`)
|
|
|
|
for i, ctor := range c.Ctors {
|
|
preamble, forwarding := gfs.emitParametersGo2CABIForwarding(ctor)
|
|
|
|
if ctor.LinuxOnly {
|
|
gfs.imports["runtime"] = struct{}{}
|
|
ret.WriteString(`
|
|
// New` + goClassName + maybeSuffix(i) + ` constructs a new ` + c.ClassName + ` object.
|
|
func New` + goClassName + maybeSuffix(i) + `(` + emitParametersGo(ctor.Parameters) + `) *` + goClassName + ` {
|
|
if runtime.GOOS == "linux" {
|
|
` + preamble + ` ret := C.` + goClassName + `_new` + maybeSuffix(i) + `(` + forwarding + `)
|
|
return new` + goClassName + `(ret)
|
|
} else {
|
|
panic("Unsupported OS")
|
|
}
|
|
}
|
|
|
|
`)
|
|
} else {
|
|
ret.WriteString(`
|
|
// New` + goClassName + maybeSuffix(i) + ` constructs a new ` + c.ClassName + ` object.
|
|
func New` + goClassName + maybeSuffix(i) + `(` + emitParametersGo(ctor.Parameters) + `) *` + goClassName + ` {
|
|
` + preamble + ` ret := C.` + goClassName + `_new` + maybeSuffix(i) + `(` + forwarding + `)
|
|
return new` + goClassName + `(ret)
|
|
}
|
|
|
|
`)
|
|
}
|
|
}
|
|
|
|
for _, m := range c.Methods {
|
|
preamble, forwarding := gfs.emitParametersGo2CABIForwarding(m)
|
|
|
|
returnTypeDecl := m.ReturnType.RenderTypeGo()
|
|
if returnTypeDecl == "void" {
|
|
returnTypeDecl = ""
|
|
}
|
|
if m.ReturnType.QtClassType() && m.ReturnType.ParameterType != "QString" && !(m.ReturnType.Pointer || m.ReturnType.ByRef) {
|
|
returnTypeDecl = "*" + returnTypeDecl
|
|
}
|
|
if (m.ReturnType.ParameterType == "char" || m.ReturnType.ParameterType == "void") && m.ReturnType.Pointer {
|
|
gfs.imports["unsafe"] = struct{}{}
|
|
returnTypeDecl = "unsafe.Pointer"
|
|
}
|
|
|
|
rvalue := `C.` + goClassName + `_` + m.SafeMethodName() + `(` + forwarding + `)`
|
|
|
|
returnFunc := gfs.emitCabiToGo("return ", m.ReturnType, rvalue)
|
|
|
|
receiverAndMethod := `(this *` + goClassName + `) ` + m.SafeMethodName()
|
|
if m.IsStatic {
|
|
receiverAndMethod = goClassName + `_` + m.SafeMethodName()
|
|
}
|
|
|
|
ret.WriteString(`
|
|
func ` + receiverAndMethod + `(` + emitParametersGo(m.Parameters) + `) ` + returnTypeDecl + ` {`)
|
|
if m.LinuxOnly {
|
|
gfs.imports["runtime"] = struct{}{}
|
|
ret.WriteString(`
|
|
if runtime.GOOS != "linux" {
|
|
panic("Unsupported OS")
|
|
}
|
|
`)
|
|
}
|
|
ret.WriteString(`
|
|
` + preamble +
|
|
returnFunc + `}
|
|
`)
|
|
|
|
// Add Connect() wrappers for signal functions
|
|
if m.IsSignal {
|
|
gfs.imports["unsafe"] = struct{}{}
|
|
gfs.imports["runtime/cgo"] = struct{}{}
|
|
|
|
var cgoNamedParams []string
|
|
var paramNames []string
|
|
conversion := ""
|
|
|
|
if len(m.Parameters) > 0 {
|
|
conversion = "// Convert all CABI parameters to Go parameters\n"
|
|
}
|
|
for i, pp := range m.Parameters {
|
|
cgoNamedParams = append(cgoNamedParams, pp.ParameterName+" "+pp.parameterTypeCgo())
|
|
|
|
paramNames = append(paramNames, fmt.Sprintf("slotval%d", i+1))
|
|
conversion += gfs.emitCabiToGo(fmt.Sprintf("slotval%d := ", i+1), pp, pp.ParameterName) + "\n"
|
|
}
|
|
|
|
ret.WriteString(`func (this *` + goClassName + `) On` + m.SafeMethodName() + `(slot func(` + emitParametersGo(m.Parameters) + `)) {
|
|
C.` + goClassName + `_connect_` + m.SafeMethodName() + `(this.h, unsafe.Pointer(uintptr(cgo.NewHandle(slot))))
|
|
}
|
|
|
|
//export miqt_exec_callback_` + goClassName + `_` + m.SafeMethodName() + `
|
|
func miqt_exec_callback_` + goClassName + `_` + m.SafeMethodName() + `(cb *C.void` + ifv(len(m.Parameters) > 0, ", ", "") + strings.Join(cgoNamedParams, `, `) + `) {
|
|
gofunc, ok := (cgo.Handle(uintptr(unsafe.Pointer(cb))).Value()).(func(` + emitParametersGo(m.Parameters) + `))
|
|
if !ok {
|
|
panic("miqt: callback of non-callback type (heap corruption?)")
|
|
}
|
|
|
|
` + conversion + `
|
|
|
|
gofunc(` + strings.Join(paramNames, `, `) + ` )
|
|
}
|
|
|
|
`)
|
|
}
|
|
}
|
|
|
|
if c.CanDelete {
|
|
gfs.imports["runtime"] = struct{}{} // Finalizer
|
|
|
|
ret.WriteString(`
|
|
// Delete this object from C++ memory.
|
|
func (this *` + goClassName + `) Delete() {
|
|
C.` + goClassName + `_Delete(this.h)
|
|
}
|
|
|
|
// GoGC adds a Go Finalizer to this pointer, so that it will be deleted
|
|
// from C++ memory once it is unreachable from Go memory.
|
|
func (this *` + goClassName + `) GoGC() {
|
|
runtime.SetFinalizer(this, func(this *` + goClassName + `) {
|
|
this.Delete()
|
|
runtime.KeepAlive(this.h)
|
|
})
|
|
}
|
|
`)
|
|
|
|
}
|
|
|
|
}
|
|
|
|
goSrc := ret.String()
|
|
|
|
// Fixup imports
|
|
if len(gfs.imports) > 0 {
|
|
allImports := make([]string, 0, len(gfs.imports))
|
|
for k, _ := range gfs.imports {
|
|
allImports = append(allImports, `"`+k+`"`)
|
|
}
|
|
sort.Strings(allImports)
|
|
goSrc = strings.Replace(goSrc, `%%_IMPORTLIBS_%%`, "import (\n\t"+strings.Join(allImports, "\n\t")+"\n)", 1)
|
|
|
|
} else {
|
|
goSrc = strings.Replace(goSrc, `%%_IMPORTLIBS_%%`, "", 1)
|
|
|
|
}
|
|
|
|
// Run gofmt over the result
|
|
formattedSrc, err := format.Source([]byte(goSrc))
|
|
if err != nil {
|
|
log.Printf("gofmt failure: %v", err)
|
|
formattedSrc = []byte(goSrc)
|
|
}
|
|
|
|
return string(formattedSrc), nil
|
|
}
|