mirror of https://github.com/mappu/miqt.git
532 lines
16 KiB
Go
532 lines
16 KiB
Go
package main
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import (
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"C"
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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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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", "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":
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ret += "uintptr"
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default:
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if strings.HasPrefix(p.ParameterType, `QFlags<`) {
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ret += "int"
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} else if strings.Contains(p.ParameterType, `::`) {
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if p.IsEnum() {
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ret += "uintptr"
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} else {
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// Inner class
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ret += cabiClassName(p.ParameterType)
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}
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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.char"
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}
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tmp := strings.Replace(p.RenderTypeCabi(), `*`, "", -1)
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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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tmp = strings.Replace(tmp, `long long`, `longlong`, -1)
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return "C." + strings.Replace(tmp, " ", "_", -1)
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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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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.ulong(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 if p.ParameterType == "QString" {
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// Go: convert string -> char* and len
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// CABI: convert char* and len -> real QString
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gfs.imports["unsafe"] = struct{}{}
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preamble += p.ParameterName + "_Cstring := C.CString(" + p.ParameterName + ")\n"
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preamble += "defer C.free(unsafe.Pointer(" + p.ParameterName + "_Cstring))\n"
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tmp = append(tmp, p.ParameterName+"_Cstring, C.ulong(len("+p.ParameterName+"))") // Second parameter cast to size_t projected type
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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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if listType.ParameterType == "QString" {
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// Combo
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gfs.imports["unsafe"] = struct{}{}
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preamble += "// For the C ABI, malloc two C arrays; raw char* pointers and their lengths\n"
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preamble += p.ParameterName + "_CArray := (*[0xffff]*" + listType.parameterTypeCgo() + ")(C.malloc(C.ulong(8 * len(" + p.ParameterName + "))))\n"
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preamble += p.ParameterName + "_Lengths := (*[0xffff]C.size_t)(C.malloc(C.ulong(8 * len(" + p.ParameterName + "))))\n"
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preamble += "defer C.free(unsafe.Pointer(" + p.ParameterName + "_CArray))\n"
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preamble += "defer C.free(unsafe.Pointer(" + p.ParameterName + "_Lengths))\n"
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preamble += "for i := range " + p.ParameterName + "{\n"
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preamble += "single_cstring := C.CString(" + p.ParameterName + "[i])\n"
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preamble += "defer C.free(unsafe.Pointer(single_cstring))\n"
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preamble += p.ParameterName + "_CArray[i] = single_cstring\n"
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preamble += p.ParameterName + "_Lengths[i] = (C.size_t)(len(" + p.ParameterName + "[i]))\n"
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preamble += "}\n"
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tmp = append(tmp, "&"+p.ParameterName+"_CArray[0], &"+p.ParameterName+"_Lengths[0], C.ulong(len("+p.ParameterName+"))")
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} else {
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preamble += "// For the C ABI, malloc a C array of raw pointers\n"
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if listType.QtClassType() {
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preamble += p.ParameterName + "_CArray := (*[0xffff]*" + listType.parameterTypeCgo() + ")(C.malloc(C.ulong(8 * len(" + p.ParameterName + "))))\n"
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} else {
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preamble += p.ParameterName + "_CArray := (*[0xffff]" + listType.parameterTypeCgo() + ")(C.malloc(C.ulong(8 * len(" + p.ParameterName + "))))\n"
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}
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preamble += "defer C.free(unsafe.Pointer(" + p.ParameterName + "_CArray))\n"
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preamble += "for i := range " + p.ParameterName + "{\n"
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if listType.QtClassType() {
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preamble += p.ParameterName + "_CArray[i] = " + p.ParameterName + "[i].cPointer()\n"
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} else {
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preamble += p.ParameterName + "_CArray[i] = (" + listType.parameterTypeCgo() + ")(" + p.ParameterName + "[i])\n"
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}
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preamble += "}\n"
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tmp = append(tmp, "&"+p.ParameterName+"_CArray[0], C.ulong(len("+p.ParameterName+"))")
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}
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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 += p.ParameterName + "_Cstring := C.CString(" + p.ParameterName + ")\n"
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preamble += "defer C.free(unsafe.Pointer(" + p.ParameterName + "_Cstring))\n"
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tmp = append(tmp, p.ParameterName+"_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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tmp = append(tmp, p.ParameterName+".cPointer()")
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} else if p.IntType() || p.ParameterType == "bool" {
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if p.Pointer || p.ByRef {
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gfs.imports["unsafe"] = struct{}{}
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tmp = append(tmp, "(*"+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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tmp = append(tmp, "("+p.parameterTypeCgo()+")("+p.ParameterName+")")
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}
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} else {
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// Default
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tmp = append(tmp, p.ParameterName)
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}
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}
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if m.ReturnType.ParameterType == "QString" {
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tmp = append(tmp, "&_out, &_out_Strlen")
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} else if t, ok := m.ReturnType.QListOf(); ok {
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if t.ParameterType == "QString" {
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// Combo
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tmp = append(tmp, "&_out, &_out_Lengths, &_out_len")
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} else {
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tmp = append(tmp, "&_out, &_out_len")
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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 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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#cgo CFLAGS: -fPIC
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#cgo pkg-config: Qt5Widgets
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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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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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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
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// call this same private ctor function, unless it goes through unsafe.Pointer{}.
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// This is probably because C types can possibly violate the ODR whereas
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// that never happens in Go's type system.
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gfs.imports["unsafe"] = struct{}{}
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ret.WriteString(`
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func new` + goClassName + `_U(h unsafe.Pointer) *` + goClassName + ` {
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return new` + goClassName + `( (*C.` + goClassName + `)(h) )
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}
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`)
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for i, ctor := range c.Ctors {
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preamble, forwarding := gfs.emitParametersGo2CABIForwarding(ctor)
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ret.WriteString(`
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// New` + goClassName + maybeSuffix(i) + ` constructs a new ` + c.ClassName + ` object.
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func New` + goClassName + maybeSuffix(i) + `(` + emitParametersGo(ctor.Parameters) + `) *` + goClassName + ` {
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` + preamble + ` ret := C.` + goClassName + `_new` + maybeSuffix(i) + `(` + forwarding + `)
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return new` + goClassName + `(ret)
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}
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`)
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}
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for _, m := range c.Methods {
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preamble, forwarding := gfs.emitParametersGo2CABIForwarding(m)
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shouldReturn := "return "
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afterword := ""
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returnTypeDecl := m.ReturnType.RenderTypeGo() // FIXME handle byRef/const here too
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if m.ReturnType.ParameterType == "void" && !m.ReturnType.Pointer {
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shouldReturn = ""
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returnTypeDecl = ""
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} else if m.ReturnType.ParameterType == "void" && m.ReturnType.Pointer {
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returnTypeDecl = "interface{}"
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} else if m.ReturnType.ParameterType == "char" && m.ReturnType.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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returnTypeDecl = "unsafe.Pointer"
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shouldReturn = "ret := "
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afterword += "return (unsafe.Pointer)(ret)\n"
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} else if m.ReturnType.ParameterType == "QString" {
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shouldReturn = ""
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returnTypeDecl = "string"
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gfs.imports["unsafe"] = struct{}{}
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preamble += "var _out *C.char = nil\n"
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preamble += "var _out_Strlen C.int = 0\n" // I think size_t is "better" but GoStringN() requires C.int
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afterword += "ret := C.GoStringN(_out, _out_Strlen)\n"
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afterword += "C.free(unsafe.Pointer(_out))\n"
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afterword += "return ret"
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} else if t, ok := m.ReturnType.QListOf(); ok {
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gfs.imports["unsafe"] = struct{}{}
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shouldReturn = ""
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returnTypeDecl = "[]" + t.RenderTypeGo()
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if t.ParameterType == "QString" {
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// Combo
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preamble += "var _out **C.char = nil\n"
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preamble += "var _out_Lengths *C.int = nil\n"
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preamble += "var _out_len C.size_t = 0\n"
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afterword += "ret := make([]string, int(_out_len))\n"
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afterword += "_outCast := (*[0xffff]*C.char)(unsafe.Pointer(_out)) // hey ya\n"
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afterword += "_out_LengthsCast := (*[0xffff]C.int)(unsafe.Pointer(_out_Lengths))\n"
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afterword += "for i := 0; i < int(_out_len); i++ {\n"
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afterword += "ret[i] = C.GoStringN(_outCast[i], _out_LengthsCast[i])\n"
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afterword += "}\n"
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afterword += "C.free(unsafe.Pointer(_out))\n"
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afterword += "return ret\n"
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} else {
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if t.QtClassType() {
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preamble += "var _out **" + t.parameterTypeCgo() + " = nil\n"
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} else {
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preamble += "var _out *" + t.parameterTypeCgo() + " = nil\n"
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}
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preamble += "var _out_len C.size_t = 0\n"
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afterword += "ret := make([]" + t.RenderTypeGo() + ", int(_out_len))\n"
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if t.QtClassType() {
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afterword += "_outCast := (*[0xffff]*" + t.parameterTypeCgo() + ")(unsafe.Pointer(_out)) // so fresh so clean\n"
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} else {
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afterword += "_outCast := (*[0xffff]" + t.parameterTypeCgo() + ")(unsafe.Pointer(_out)) // mrs jackson\n"
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}
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afterword += "for i := 0; i < int(_out_len); i++ {\n"
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if t.QtClassType() {
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if !t.Pointer {
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// new, but then dereference it
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afterword += "ret[i] = *new" + cabiClassName(t.ParameterType) + "(_outCast[i])\n"
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} else {
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afterword += "ret[i] = new" + cabiClassName(t.ParameterType) + "(_outCast[i])\n"
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}
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} else { // plain int type
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afterword += "ret[i] = (" + t.RenderTypeGo() + ")(_outCast[i])\n"
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}
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afterword += "}\n"
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afterword += "C.free(unsafe.Pointer(_out))\n"
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afterword += "return ret\n"
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}
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} else if m.ReturnType.QtClassType() {
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// Construct our Go type based on this inner CABI type
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shouldReturn = "ret := "
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if m.ReturnType.Pointer || m.ReturnType.ByRef {
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gfs.imports["unsafe"] = struct{}{}
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afterword = "return new" + cabiClassName(m.ReturnType.ParameterType) + "_U(unsafe.Pointer(ret))"
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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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returnTypeDecl = "*" + returnTypeDecl
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gfs.imports["runtime"] = struct{}{}
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afterword = "// Qt uses pass-by-value semantics for this type. Mimic with finalizer\n"
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afterword += "ret1 := new" + cabiClassName(m.ReturnType.ParameterType) + "(ret)\n"
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afterword += "runtime.SetFinalizer(ret1, func(ret2 *" + cabiClassName(m.ReturnType.ParameterType) + ") {\n"
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afterword += "ret2.Delete()\n"
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afterword += "runtime.KeepAlive(ret2.h)\n"
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afterword += "})\n"
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afterword += "return ret1\n"
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}
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} else if m.ReturnType.IntType() || m.ReturnType.ParameterType == "bool" {
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// Need to cast Cgo type to Go int type
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shouldReturn = "ret := "
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afterword += "return (" + m.ReturnType.RenderTypeGo() + ")(ret)\n"
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}
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receiverAndMethod := `(this *` + goClassName + `) ` + m.SafeMethodName()
|
|
if m.IsStatic {
|
|
receiverAndMethod = goClassName + `_` + m.SafeMethodName()
|
|
}
|
|
|
|
ret.WriteString(`
|
|
func ` + receiverAndMethod + `(` + emitParametersGo(m.Parameters) + `) ` + returnTypeDecl + ` {
|
|
` + preamble +
|
|
shouldReturn + ` C.` + goClassName + `_` + m.SafeMethodName() + `(` + forwarding + `)
|
|
` + afterword + `}
|
|
|
|
`)
|
|
|
|
// Add Connect() wrappers for signal functions
|
|
if m.IsSignal && !m.HasHiddenParams {
|
|
gfs.imports["unsafe"] = struct{}{}
|
|
gfs.imports["runtime/cgo"] = struct{}{}
|
|
ret.WriteString(`func (this *` + goClassName + `) On` + m.SafeMethodName() + `(slot func()) {
|
|
var slotWrapper miqtCallbackFunc = func(argc C.int, args *C.void) {
|
|
slot()
|
|
}
|
|
|
|
C.` + goClassName + `_connect_` + m.SafeMethodName() + `(this.h, unsafe.Pointer(uintptr(cgo.NewHandle(slotWrapper))))
|
|
}
|
|
`)
|
|
}
|
|
}
|
|
|
|
if c.CanDelete {
|
|
ret.WriteString(`
|
|
func (this *` + goClassName + `) Delete() {
|
|
C.` + goClassName + `_Delete(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
|
|
}
|