mirror of https://github.com/mappu/miqt.git
genbindings: handle signal arguments from cabi->go
This commit is contained in:
parent
7f56b4147c
commit
6af39e88e4
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@ -2,6 +2,7 @@ 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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@ -275,6 +276,110 @@ func (gfs *goFileState) emitParametersGo2CABIForwarding(m CppMethod) (preamble s
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return preamble, strings.Join(tmp, ", ")
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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 := 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 += "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 + " 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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if t.ParameterType == "QString" {
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// Combo
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afterword += namePrefix + "_ret := make([]string, int(" + namePrefix + "_ma.len))\n"
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afterword += "_outCast := (*[0xffff]*C.struct_miqt_string)(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 += "ret[i] = C.GoStringN(&_outCast[i].data, C.int(int64(_outCast[i].len)))\n"
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afterword += "C.free(unsafe.Pointer(_outCast[i])) // free the inner miqt_string*\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 {
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afterword += "" + namePrefix + "_ret := make([]" + t.RenderTypeGo() + ", int(" + namePrefix + "_ma.len))\n"
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if t.QtClassType() {
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afterword += "_outCast := (*[0xffff]*" + t.parameterTypeCgo() + ")(unsafe.Pointer(" + namePrefix + "_ma.data)) // so fresh so clean\n"
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} else {
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afterword += "_outCast := (*[0xffff]" + t.parameterTypeCgo() + ")(unsafe.Pointer(" + namePrefix + "_ma.data)) // mrs jackson\n"
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}
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afterword += "for i := 0; i < int(" + namePrefix + "_ma.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 += "" + namePrefix + "_ret[i] = *new" + cabiClassName(t.ParameterType) + "(_outCast[i])\n"
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} else {
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afterword += "" + namePrefix + "_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 += "" + namePrefix + "_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(" + namePrefix + "_ma))\n"
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afterword += assignExpr + " " + namePrefix + "_ret\n"
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}
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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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afterword = assignExpr + " new" + cabiClassName(rt.ParameterType) + "_U(unsafe.Pointer(" + namePrefix + "_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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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 += "" + namePrefix + "_ret1 := new" + cabiClassName(rt.ParameterType) + "(" + namePrefix + "_ret)\n"
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afterword += "runtime.SetFinalizer(" + namePrefix + "_ret1, func(" + namePrefix + "_ret2 *" + cabiClassName(rt.ParameterType) + ") {\n"
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afterword += "" + namePrefix + "_ret2.Delete()\n"
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afterword += "runtime.KeepAlive(" + namePrefix + "_ret2.h)\n"
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afterword += "})\n"
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afterword += assignExpr + "" + namePrefix + "_ret1\n"
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}
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} else if rt.IntType() || rt.ParameterType == "bool" {
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// Need to cast Cgo type to Go int type
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shouldReturn = "" + namePrefix + "_ret := "
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afterword += assignExpr + "(" + rt.RenderTypeGo() + ")(" + namePrefix + "_ret)\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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@ -397,140 +502,42 @@ import "C"
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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 := m.ReturnType.RenderTypeGo()
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if returnTypeDecl == "void" {
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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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}
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if m.ReturnType.QtClassType() && m.ReturnType.ParameterType != "QString" && !(m.ReturnType.Pointer || m.ReturnType.ByRef) {
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returnTypeDecl = "*" + returnTypeDecl
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}
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if (m.ReturnType.ParameterType == "char" || m.ReturnType.ParameterType == "void") && m.ReturnType.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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returnTypeDecl = "string"
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gfs.imports["unsafe"] = struct{}{}
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shouldReturn = "var ret_ms *C.struct_miqt_string = "
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afterword += "ret := C.GoStringN(&ret_ms.data, C.int(int64(ret_ms.len)))\n"
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afterword += "C.free(unsafe.Pointer(ret_ms))\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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returnTypeDecl = "[]" + t.RenderTypeGo()
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shouldReturn = "var ret_ma *C.struct_miqt_array = "
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if t.ParameterType == "QString" {
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// Combo
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afterword += "ret := make([]string, int(ret_ma.len))\n"
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afterword += "_outCast := (*[0xffff]*C.struct_miqt_string)(unsafe.Pointer(ret_ma.data)) // hey ya\n"
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afterword += "for i := 0; i < int(ret_ma.len); i++ {\n"
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afterword += "ret[i] = C.GoStringN(&_outCast[i].data, C.int(int64(_outCast[i].len)))\n"
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afterword += "C.free(unsafe.Pointer(_outCast[i])) // free the inner miqt_string*\n"
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afterword += "}\n"
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afterword += "C.free(unsafe.Pointer(ret_ma))\n"
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afterword += "return ret\n"
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} else {
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afterword += "ret := make([]" + t.RenderTypeGo() + ", int(ret_ma.len))\n"
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if t.QtClassType() {
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afterword += "_outCast := (*[0xffff]*" + t.parameterTypeCgo() + ")(unsafe.Pointer(ret_ma.data)) // so fresh so clean\n"
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} else {
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afterword += "_outCast := (*[0xffff]" + t.parameterTypeCgo() + ")(unsafe.Pointer(ret_ma.data)) // mrs jackson\n"
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}
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afterword += "for i := 0; i < int(ret_ma.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(ret_ma))\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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rvalue := `C.` + goClassName + `_` + m.SafeMethodName() + `(` + forwarding + `)`
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returnFunc := gfs.emitCabiToGo("return ", m.ReturnType, rvalue)
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receiverAndMethod := `(this *` + goClassName + `) ` + m.SafeMethodName()
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if m.IsStatic {
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receiverAndMethod = goClassName + `_` + m.SafeMethodName()
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}
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ret.WriteString(`
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func ` + receiverAndMethod + `(` + emitParametersGo(m.Parameters) + `) ` + returnTypeDecl + ` {`)
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if m.LinuxOnly {
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gfs.imports["runtime"] = struct{}{}
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ret.WriteString(`
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func ` + receiverAndMethod + `(` + emitParametersGo(m.Parameters) + `) ` + returnTypeDecl + ` {
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if runtime.GOOS == "linux" {
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` + preamble +
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shouldReturn + ` C.` + goClassName + `_` + m.SafeMethodName() + `(` + forwarding + `)
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` + afterword + `
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} else {
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if runtime.GOOS != "linux" {
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panic("Unsupported OS")
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}
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`)
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}
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`)
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} else {
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ret.WriteString(`
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func ` + receiverAndMethod + `(` + emitParametersGo(m.Parameters) + `) ` + returnTypeDecl + ` {
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ret.WriteString(`
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` + preamble +
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shouldReturn + ` C.` + goClassName + `_` + m.SafeMethodName() + `(` + forwarding + `)
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` + afterword + `}
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returnFunc + `}
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`)
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}
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// Add Connect() wrappers for signal functions
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if m.IsSignal {
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gfs.imports["unsafe"] = struct{}{}
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@ -538,31 +545,34 @@ import "C"
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var cgoNamedParams []string
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var paramNames []string
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for _, pp := range m.Parameters {
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conversion := ""
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if len(m.Parameters) > 0 {
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conversion = "// Convert all CABI parameters to Go parameters\n"
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}
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for i, pp := range m.Parameters {
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cgoNamedParams = append(cgoNamedParams, pp.ParameterName+" "+pp.parameterTypeCgo())
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paramNames = append(paramNames, pp.ParameterName)
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paramNames = append(paramNames, fmt.Sprintf("slotval%d", i+1))
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conversion += gfs.emitCabiToGo(fmt.Sprintf("slotval%d := ", i+1), pp, pp.ParameterName) + "\n"
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}
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ret.WriteString(`func (this *` + goClassName + `) On` + m.SafeMethodName() + `(slot func(` + emitParametersGo(m.Parameters) + `)) {
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slotWrapper := func(` + strings.Join(cgoNamedParams, `, `) + `) {
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// TODO convert CABI parameters to Go parameters here
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slot()
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}
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C.` + goClassName + `_connect_` + m.SafeMethodName() + `(this.h, unsafe.Pointer(uintptr(cgo.NewHandle(slotWrapper))))
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C.` + goClassName + `_connect_` + m.SafeMethodName() + `(this.h, unsafe.Pointer(uintptr(cgo.NewHandle(slot))))
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}
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//export miqt_exec_callback_` + goClassName + `_` + m.SafeMethodName() + `
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func miqt_exec_callback_` + goClassName + `_` + m.SafeMethodName() + `(cb *C.void` + ifv(len(m.Parameters) > 0, ", ", "") + strings.Join(cgoNamedParams, `, `) + `) {
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cfunc, ok := (cgo.Handle(uintptr(unsafe.Pointer(cb))).Value()).(func(` + strings.Join(cgoNamedParams, `, `) + `))
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gofunc, ok := (cgo.Handle(uintptr(unsafe.Pointer(cb))).Value()).(func(` + emitParametersGo(m.Parameters) + `))
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if !ok {
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panic("miqt: callback of non-callback type (heap corruption?)")
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}
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cfunc(` + strings.Join(paramNames, `, `) + ` )
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` + conversion + `
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gofunc(` + strings.Join(paramNames, `, `) + ` )
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}
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`)
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}
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}
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