support marking data types as linux-only

cmd/genbindings/emitcabi.go

@@ -511,6 +511,11 @@ extern "C" {
 		cClassName := cabiClassName(c.ClassName)
 
 		for i, ctor := range c.Ctors {
+
+			if ctor.LinuxOnly {
+				ret.WriteString("#ifdef Q_OS_LINUX\n\n")
+			}
+
 			preamble, forwarding := emitParametersCABI2CppForwarding(ctor.Parameters)
 			ret.WriteString(fmt.Sprintf(
 				"%s* %s_new%s(%s) {\n"+
@@ -522,6 +527,10 @@ extern "C" {
 				preamble,
 				c.ClassName, forwarding,
 			))
+
+			if ctor.LinuxOnly {
+				ret.WriteString("#endif /* Q_OS_LINUX */\n\n")
+			}
 		}
 
 		for _, m := range c.Methods {
@@ -657,6 +666,10 @@ extern "C" {
 				callTarget = "const_cast<const " + c.ClassName + "*>(self)->"
 			}
 
+			if m.LinuxOnly {
+				ret.WriteString("#ifdef Q_OS_LINUX\n\n")
+			}
+
 			ret.WriteString(fmt.Sprintf(
 				"%s %s_%s(%s) {\n"+
 					"%s"+
@@ -682,6 +695,11 @@ extern "C" {
 						"\n",
 				)
 			}
+
+			if m.LinuxOnly {
+				ret.WriteString("#endif /* Q_OS_LINUX */\n\n")
+			}
+
 		}
 
 		// Delete

cmd/genbindings/emitgo.go

@@ -347,6 +347,22 @@ import "C"
 
 		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 + ` {
@@ -356,6 +372,7 @@ import "C"
 			
 			`)
 			}
+		}
 
 		for _, m := range c.Methods {
 			preamble, forwarding := gfs.emitParametersGo2CABIForwarding(m)
@@ -478,6 +495,21 @@ import "C"
 				receiverAndMethod = goClassName + `_` + m.SafeMethodName()
 			}
 
+			if m.LinuxOnly {
+				gfs.imports["runtime"] = struct{}{}
+				ret.WriteString(`
+			func ` + receiverAndMethod + `(` + emitParametersGo(m.Parameters) + `) ` + returnTypeDecl + ` {
+				if runtime.GOOS == "linux" {
+					` + preamble +
+					shouldReturn + ` C.` + goClassName + `_` + m.SafeMethodName() + `(` + forwarding + `)
+` + afterword + `
+				} else {
+					panic("Unsupported OS")
+				}
+			}
+			
+			`)
+			} else {
 				ret.WriteString(`
 			func ` + receiverAndMethod + `(` + emitParametersGo(m.Parameters) + `) ` + returnTypeDecl + ` {
 				` + preamble +
@@ -486,6 +518,8 @@ import "C"
 			
 			`)
 
+			}
+
 			// Add Connect() wrappers for signal functions
 			if m.IsSignal && !m.HasHiddenParams {
 				gfs.imports["unsafe"] = struct{}{}

cmd/genbindings/exceptions.go

@@ -225,3 +225,17 @@ func CheckComplexity(p CppParameter, isReturnType bool) error {
 	// Should be OK
 	return nil
 }
+
+// LinuxWindowsCompatCheck checks if the parameter is incompatible between the
+// generated headers (generated on Linux) with other OSes such as Windows.
+// These methods will be blocked on non-Linux OSes.
+func LinuxWindowsCompatCheck(p CppParameter) bool {
+	if p.TypeAlias == "Q_PID" {
+		return true // int64 on Linux, _PROCESS_INFORMATION* on Windows
+	}
+
+	if p.ParameterType == "QSocketDescriptor::DescriptorType" {
+		return true // uintptr_t-compatible on Linux, void* on Windows
+	}
+	return false
+}

cmd/genbindings/intermediate.go

@@ -20,11 +20,6 @@ func init() {
 
 	KnownTypedefs["WId"] = CppTypedef{"WId", parseSingleTypeString("uintptr_t")}
 
-	// This is a uint64 PID on Linux/mac and a PROCESS_INFORMATION* on Windows
-	// A uintptr should be tolerable for both cases until we do better
-	// @ref https://doc.qt.io/qt-5/qprocess.html#Q_PID-typedef
-	KnownTypedefs["Q_PID"] = CppTypedef{"WId", parseSingleTypeString("uintptr_t")}
-
 	// QString is deleted from this binding
 	KnownTypedefs["QStringList"] = CppTypedef{"QStringList", parseSingleTypeString("QList<QString>")}
 
@@ -186,6 +181,7 @@ type CppMethod struct {
 	IsSignal           bool
 	IsConst            bool
 	HasHiddenParams    bool // Set to true if there is an overload with more parameters
+	LinuxOnly          bool
 }
 
 func IsArgcArgv(params []CppParameter, pos int) bool {

cmd/genbindings/transformtypedefs.go

@@ -33,17 +33,33 @@ func astTransformTypedefs(parsed *CppParsedHeader) {
 		for j, m := range c.Methods {
 
 			for k, p := range m.Parameters {
-				m.Parameters[k] = applyTypedefs(p)
+				transformed := applyTypedefs(p)
+				m.Parameters[k] = transformed
+
+				if LinuxWindowsCompatCheck(transformed) {
+					m.LinuxOnly = true
+				}
 			}
 
 			m.ReturnType = applyTypedefs(m.ReturnType)
+
+			// Also apply OS compatibility rules
+			if LinuxWindowsCompatCheck(m.ReturnType) {
+				m.LinuxOnly = true
+			}
+
 			c.Methods[j] = m
 		}
 
 		for j, m := range c.Ctors {
 
 			for k, p := range m.Parameters {
-				m.Parameters[k] = applyTypedefs(p)
+				transformed := applyTypedefs(p)
+				m.Parameters[k] = transformed
+
+				if LinuxWindowsCompatCheck(transformed) {
+					m.LinuxOnly = true
+				}
 			}
 
 			c.Ctors[j] = m

qt/gen_qprocess.cpp

@@ -352,10 +352,14 @@ uintptr_t QProcess_State(QProcess* self) {
 	return static_cast<uintptr_t>(ret);
 }
 
+#ifdef Q_OS_LINUX
+
 int64_t QProcess_Pid(QProcess* self) {
 	return const_cast<const QProcess*>(self)->pid();
 }
 
+#endif /* Q_OS_LINUX */
+
 long long QProcess_ProcessId(QProcess* self) {
 	return const_cast<const QProcess*>(self)->processId();
 }

qt/gen_qprocess.go

@@ -450,8 +450,13 @@ func (this *QProcess) State() uintptr {
 }
 
 func (this *QProcess) Pid() int64 {
+	if runtime.GOOS == "linux" {
 		ret := C.QProcess_Pid(this.h)
 		return (int64)(ret)
+
+	} else {
+		panic("Unsupported OS")
+	}
 }
 
 func (this *QProcess) ProcessId() int64 {

qt/gen_qsocketnotifier.cpp

@@ -108,10 +108,14 @@ QSocketDescriptor* QSocketDescriptor_new2(QSocketDescriptor* param1) {
 	return new QSocketDescriptor(*param1);
 }
 
+#ifdef Q_OS_LINUX
+
 QSocketDescriptor* QSocketDescriptor_new3(uintptr_t descriptor) {
 	return new QSocketDescriptor(static_cast<QSocketDescriptor::DescriptorType>(descriptor));
 }
 
+#endif /* Q_OS_LINUX */
+
 bool QSocketDescriptor_IsValid(QSocketDescriptor* self) {
 	return const_cast<const QSocketDescriptor*>(self)->isValid();
 }

qt/gen_qsocketnotifier.go

@@ -9,6 +9,7 @@ package qt
 import "C"
 
 import (
+	"runtime"
 	"unsafe"
 )
 
@@ -185,8 +186,12 @@ func NewQSocketDescriptor2(param1 *QSocketDescriptor) *QSocketDescriptor {
 
 // NewQSocketDescriptor3 constructs a new QSocketDescriptor object.
 func NewQSocketDescriptor3(descriptor uintptr) *QSocketDescriptor {
+	if runtime.GOOS == "linux" {
 		ret := C.QSocketDescriptor_new3((C.uintptr_t)(descriptor))
 		return newQSocketDescriptor(ret)
+	} else {
+		panic("Unsupported OS")
+	}
 }
 
 func (this *QSocketDescriptor) IsValid() bool {