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https://github.com/mappu/miqt.git
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genbindings/cabi: refactor extract cpp-to-cabi handling from return path
This commit is contained in:
parent
52c6c3b0ea
commit
7880f14c52
@ -314,6 +314,130 @@ func emitParametersCABI2CppForwarding(params []CppParameter) (preamble string, f
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return preamble, strings.Join(tmp, ", ")
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}
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// emitAssignCppToCabi transforms and assigns rvalue to the assignExpression.
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// Sample assignExpression: `return `, `auto foo = `
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// Sample rvalue: `foo`, `foo(xyz)`
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// The return is a complete statement including trailing newline.
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func emitAssignCppToCabi(assignExpression string, p CppParameter, rvalue string) string {
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shouldReturn := assignExpression
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afterCall := ""
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if p.ParameterType == "void" && !p.Pointer {
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shouldReturn = ""
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} else if p.ParameterType == "QString" {
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if p.Pointer {
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// e.g. QTextStream::String()
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// These are rare, and probably expected to be lightweight references
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// But, a copy is the best we can project it as
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// Un-pointer-ify
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shouldReturn = "QString* ret = "
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afterCall = "\t// Convert QString pointer from UTF-16 in C++ RAII memory to UTF-8 in manually-managed C memory\n"
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afterCall += "\tQByteArray b = ret->toUtf8();\n"
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} else {
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shouldReturn = "QString ret = "
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afterCall = "\t// Convert QString from UTF-16 in C++ RAII memory to UTF-8 in manually-managed C memory\n"
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afterCall += "\tQByteArray b = ret.toUtf8();\n"
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}
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if p.Const {
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shouldReturn = "const " + shouldReturn
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}
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afterCall += "\t*_out = static_cast<char*>(malloc(b.length()));\n"
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afterCall += "\tmemcpy(*_out, b.data(), b.length());\n"
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afterCall += "\t*_out_Strlen = b.length();\n"
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} else if t, ok := p.QListOf(); ok {
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if t.ParameterType == "QString" {
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// Combo
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// "char** _out, int64_t* _out_Lengths, size_t* _out_len")
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shouldReturn = p.RenderTypeQtCpp() + " ret = "
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afterCall += "\t// Convert QStringList from C++ memory to manually-managed C memory\n"
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afterCall += "\tchar** __out = static_cast<char**>(malloc(sizeof(char*) * ret.length()));\n"
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afterCall += "\tint* __out_Lengths = static_cast<int*>(malloc(sizeof(int) * ret.length()));\n"
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afterCall += "\tfor (size_t i = 0, e = ret.length(); i < e; ++i) {\n"
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afterCall += "\t\t// Convert QString from UTF-16 in C++ RAII memory to UTF-8 in manually-managed C memory\n"
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afterCall += "\t\tQByteArray b = ret[i].toUtf8();\n"
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afterCall += "\t\t__out[i] = static_cast<char*>(malloc(b.length()));\n"
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afterCall += "\t\tmemcpy(__out[i], b.data(), b.length());\n"
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afterCall += "\t\t__out_Lengths[i] = b.length();\n"
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afterCall += "\t}\n"
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afterCall += "\t*_out = __out;\n"
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afterCall += "\t*_out_Lengths = __out_Lengths;\n"
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afterCall += "\t*_out_len = ret.length();\n"
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} else if !t.QtClassType() || (t.QtClassType() && t.Pointer) { // QList<int>, QList<QFoo*>
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shouldReturn = p.RenderTypeQtCpp() + " ret = "
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afterCall += "\t// Convert QList<> from C++ memory to manually-managed C memory\n"
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afterCall += "\t" + t.RenderTypeCabi() + "* __out = static_cast<" + t.RenderTypeCabi() + "*>(malloc(sizeof(" + t.RenderTypeCabi() + ") * ret.length()));\n"
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afterCall += "\tfor (size_t i = 0, e = ret.length(); i < e; ++i) {\n"
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if t.Const {
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nonConst := t // copy
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nonConst.Const = false
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afterCall += "\t\t__out[i] = const_cast<" + t.RenderTypeCabi() + ">(ret[i]);\n"
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} else {
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afterCall += "\t\t__out[i] = ret[i];\n"
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}
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afterCall += "\t}\n"
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afterCall += "\t*_out = __out;\n"
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afterCall += "\t*_out_len = ret.length();\n"
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} else { // QList<QFoo>
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shouldReturn = p.RenderTypeQtCpp() + " ret = "
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afterCall += "\t// Convert QList<> from C++ memory to manually-managed C memory of copy-constructed pointers\n"
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afterCall += "\t" + t.RenderTypeCabi() + "** __out = static_cast<" + t.RenderTypeCabi() + "**>(malloc(sizeof(" + t.RenderTypeCabi() + "**) * ret.length()));\n"
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afterCall += "\tfor (size_t i = 0, e = ret.length(); i < e; ++i) {\n"
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afterCall += "\t\t__out[i] = new " + t.ParameterType + "(ret[i]);\n"
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afterCall += "\t}\n"
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afterCall += "\t*_out = __out;\n"
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afterCall += "\t*_out_len = ret.length();\n"
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}
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} else if p.QtClassType() && p.ByRef {
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// It's a pointer in disguise, just needs one cast
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shouldReturn = p.RenderTypeQtCpp() + " ret = "
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afterCall += "\t// Cast returned reference into pointer\n"
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if p.Const {
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nonConst := p // copy
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nonConst.Const = false
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nonConst.ByRef = false
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nonConst.Pointer = true
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nonConst.PointerCount = 1
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afterCall += "\t" + assignExpression + "const_cast<" + nonConst.RenderTypeQtCpp() + ">(&ret);\n"
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} else {
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afterCall += "\t" + assignExpression + "&ret;\n"
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}
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} else if p.QtClassType() && !p.Pointer {
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shouldReturn = p.ParameterType + " ret = "
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afterCall = "\t// Copy-construct value returned type into heap-allocated copy\n"
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afterCall += "\treturn static_cast<" + p.ParameterType + "*>(new " + p.ParameterType + "(ret));\n"
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} else if p.Const {
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shouldReturn += "(" + emitReturnTypeCabi(p) + ") "
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} else if p.IsFlagType() {
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// Needs an explicit int cast
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shouldReturn = p.RenderTypeQtCpp() + " ret = "
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afterCall += "\t" + assignExpression + "static_cast<int>(ret);\n"
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} else if p.IsEnum() {
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// Needs an explicit uintptr cast
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shouldReturn = p.RenderTypeQtCpp() + " ret = "
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afterCall += "\t" + assignExpression + "static_cast<uintptr_t>(ret);\n"
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}
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return shouldReturn + rvalue + ";\n" + afterCall
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}
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// getReferencedTypes finds all referenced Qt types in this file.
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func getReferencedTypes(src *CppParsedHeader) []string {
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@ -561,141 +685,22 @@ extern "C" {
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for _, m := range c.Methods {
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// Need to take an extra 'self' parameter
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shouldReturn := "return "
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afterCall := ""
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if m.ReturnType.ParameterType == "void" && !m.ReturnType.Pointer {
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shouldReturn = ""
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} else if m.ReturnType.ParameterType == "QString" {
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if m.ReturnType.Pointer {
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// e.g. QTextStream::String()
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// These are rare, and probably expected to be lightweight references
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// But, a copy is the best we can project it as
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// Un-pointer-ify
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shouldReturn = "QString* ret = "
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afterCall = "\t// Convert QString pointer from UTF-16 in C++ RAII memory to UTF-8 in manually-managed C memory\n"
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afterCall += "\tQByteArray b = ret->toUtf8();\n"
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} else {
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shouldReturn = "QString ret = "
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afterCall = "\t// Convert QString from UTF-16 in C++ RAII memory to UTF-8 in manually-managed C memory\n"
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afterCall += "\tQByteArray b = ret.toUtf8();\n"
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}
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if m.ReturnType.Const {
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shouldReturn = "const " + shouldReturn
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}
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afterCall += "\t*_out = static_cast<char*>(malloc(b.length()));\n"
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afterCall += "\tmemcpy(*_out, b.data(), b.length());\n"
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afterCall += "\t*_out_Strlen = b.length();\n"
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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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// "char** _out, int64_t* _out_Lengths, size_t* _out_len")
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shouldReturn = m.ReturnType.RenderTypeQtCpp() + " ret = "
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afterCall += "\t// Convert QStringList from C++ memory to manually-managed C memory\n"
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afterCall += "\tchar** __out = static_cast<char**>(malloc(sizeof(char*) * ret.length()));\n"
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afterCall += "\tint* __out_Lengths = static_cast<int*>(malloc(sizeof(int) * ret.length()));\n"
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afterCall += "\tfor (size_t i = 0, e = ret.length(); i < e; ++i) {\n"
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afterCall += "\t\t// Convert QString from UTF-16 in C++ RAII memory to UTF-8 in manually-managed C memory\n"
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afterCall += "\t\tQByteArray b = ret[i].toUtf8();\n"
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afterCall += "\t\t__out[i] = static_cast<char*>(malloc(b.length()));\n"
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afterCall += "\t\tmemcpy(__out[i], b.data(), b.length());\n"
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afterCall += "\t\t__out_Lengths[i] = b.length();\n"
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afterCall += "\t}\n"
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afterCall += "\t*_out = __out;\n"
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afterCall += "\t*_out_Lengths = __out_Lengths;\n"
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afterCall += "\t*_out_len = ret.length();\n"
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} else if !t.QtClassType() || (t.QtClassType() && t.Pointer) { // QList<int>, QList<QFoo*>
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shouldReturn = m.ReturnType.RenderTypeQtCpp() + " ret = "
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afterCall += "\t// Convert QList<> from C++ memory to manually-managed C memory\n"
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afterCall += "\t" + t.RenderTypeCabi() + "* __out = static_cast<" + t.RenderTypeCabi() + "*>(malloc(sizeof(" + t.RenderTypeCabi() + ") * ret.length()));\n"
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afterCall += "\tfor (size_t i = 0, e = ret.length(); i < e; ++i) {\n"
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if t.Const {
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nonConst := t // copy
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nonConst.Const = false
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afterCall += "\t\t__out[i] = const_cast<" + t.RenderTypeCabi() + ">(ret[i]);\n"
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} else {
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afterCall += "\t\t__out[i] = ret[i];\n"
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}
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afterCall += "\t}\n"
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afterCall += "\t*_out = __out;\n"
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afterCall += "\t*_out_len = ret.length();\n"
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} else { // QList<QFoo>
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shouldReturn = m.ReturnType.RenderTypeQtCpp() + " ret = "
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afterCall += "\t// Convert QList<> from C++ memory to manually-managed C memory of copy-constructed pointers\n"
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afterCall += "\t" + t.RenderTypeCabi() + "** __out = static_cast<" + t.RenderTypeCabi() + "**>(malloc(sizeof(" + t.RenderTypeCabi() + "**) * ret.length()));\n"
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afterCall += "\tfor (size_t i = 0, e = ret.length(); i < e; ++i) {\n"
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afterCall += "\t\t__out[i] = new " + t.ParameterType + "(ret[i]);\n"
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afterCall += "\t}\n"
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afterCall += "\t*_out = __out;\n"
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afterCall += "\t*_out_len = ret.length();\n"
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}
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} else if m.ReturnType.QtClassType() && m.ReturnType.ByRef {
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// It's a pointer in disguise, just needs one cast
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shouldReturn = m.ReturnType.RenderTypeQtCpp() + " ret = "
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afterCall += "\t// Cast returned reference into pointer\n"
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if m.ReturnType.Const {
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nonConst := m.ReturnType // copy
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nonConst.Const = false
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nonConst.ByRef = false
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nonConst.Pointer = true
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nonConst.PointerCount = 1
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afterCall += "\treturn const_cast<" + nonConst.RenderTypeQtCpp() + ">(&ret);\n"
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} else {
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afterCall += "\treturn &ret;\n"
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}
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} else if m.ReturnType.QtClassType() && !m.ReturnType.Pointer {
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shouldReturn = m.ReturnType.ParameterType + " ret = "
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afterCall = "\t// Copy-construct value returned type into heap-allocated copy\n"
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afterCall += "\treturn static_cast<" + m.ReturnType.ParameterType + "*>(new " + m.ReturnType.ParameterType + "(ret));\n"
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} else if m.ReturnType.Const {
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shouldReturn += "(" + emitReturnTypeCabi(m.ReturnType) + ") "
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} else if m.ReturnType.IsFlagType() {
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// Needs an explicit int cast
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shouldReturn = m.ReturnType.RenderTypeQtCpp() + " ret = "
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afterCall += "\treturn static_cast<int>(ret);\n"
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} else if m.ReturnType.IsEnum() {
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// Needs an explicit uintptr cast
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shouldReturn = m.ReturnType.RenderTypeQtCpp() + " ret = "
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afterCall += "\treturn static_cast<uintptr_t>(ret);\n"
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}
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preamble, forwarding := emitParametersCABI2CppForwarding(m.Parameters)
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nativeMethodName := m.MethodName
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if m.OverrideMethodName != "" {
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nativeMethodName = m.OverrideMethodName
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}
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// callTarget is an rvalue representing the full C++ function call.
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callTarget := "self->"
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if m.IsStatic {
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callTarget = c.ClassName + "::"
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}
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callTarget += m.CppCallTarget() + "(" + forwarding + ")"
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if m.LinuxOnly {
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ret.WriteString(fmt.Sprintf(
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"%s %s_%s(%s) {\n"+
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"#ifdef Q_OS_LINUX\n"+
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"%s"+
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"\t%s%s%s(%s);\n"+
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"%s"+
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"\t%s"+
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"#else\n"+
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"\t%s _ret_invalidOS;\n"+
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"\treturn _ret_invalidOS;\n"+
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@ -704,8 +709,7 @@ extern "C" {
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"\n",
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emitReturnTypeCabi(m.ReturnType), cClassName, m.SafeMethodName(), emitParametersCabi(m, ifv(m.IsConst, "const ", "")+cClassName+"*"),
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preamble,
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shouldReturn, callTarget, nativeMethodName, forwarding,
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afterCall,
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emitAssignCppToCabi("return ", m.ReturnType, callTarget),
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emitReturnTypeCabi(m.ReturnType),
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))
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@ -714,14 +718,12 @@ extern "C" {
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ret.WriteString(fmt.Sprintf(
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"%s %s_%s(%s) {\n"+
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"%s"+
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"\t%s%s%s(%s);\n"+
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"%s"+
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"\t%s"+
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"}\n"+
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"\n",
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emitReturnTypeCabi(m.ReturnType), cClassName, m.SafeMethodName(), emitParametersCabi(m, ifv(m.IsConst, "const ", "")+cClassName+"*"),
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preamble,
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shouldReturn, callTarget, nativeMethodName, forwarding,
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afterCall,
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emitAssignCppToCabi("return ", m.ReturnType, callTarget),
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))
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}
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@ -729,7 +731,7 @@ extern "C" {
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if m.IsSignal {
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// If there are hidden parameters, the type of the signal itself
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// needs to include them
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exactSignal := `static_cast<void (` + c.ClassName + `::*)(` + emitParameterTypesCpp(m, true) + `)>(&` + c.ClassName + `::` + nativeMethodName + `)`
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exactSignal := `static_cast<void (` + c.ClassName + `::*)(` + emitParameterTypesCpp(m, true) + `)>(&` + c.ClassName + `::` + m.CppCallTarget() + `)`
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ret.WriteString(
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`void ` + cClassName + `_connect_` + m.SafeMethodName() + `(` + cClassName + `* self, void* slot) {` + "\n" +
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@ -191,6 +191,13 @@ type CppMethod struct {
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LinuxOnly bool
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}
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func (m CppMethod) CppCallTarget() string {
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if m.OverrideMethodName != "" {
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return m.OverrideMethodName
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}
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return m.MethodName
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}
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func IsArgcArgv(params []CppParameter, pos int) bool {
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// Check if the arguments starting at position=pos are the argc/argv pattern.
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// QApplication/QGuiApplication constructors are the only expected example of this.
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