mirror of
https://github.com/mappu/miqt.git
synced 2024-12-23 01:18:37 +00:00
265 lines
7.4 KiB
Go
265 lines
7.4 KiB
Go
package main
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import (
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"fmt"
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"sort"
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"strings"
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)
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func (p CppParameter) RenderTypeCpp() string {
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ret := p.ParameterType
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if p.Pointer || p.ByRef {
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ret += "*"
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}
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return ret // ignore const
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}
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func emitReturnTypeCabi(p CppParameter) string {
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if p.ParameterType == "QString" {
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return "void" // Will be handled separately
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} else if (p.Pointer || p.ByRef) && p.QtClassType() {
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return "P" + p.ParameterType // CABI type
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} else if p.QtClassType() && !p.Pointer {
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// Even if C++ returns by value, CABI is returning a heap copy (new'd, not malloc'd)
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return "P" + p.ParameterType // CABI type
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// return "void" // Handled separately with an _out pointer
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} else {
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return p.RenderTypeCpp()
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}
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}
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func emitParametersCabi(m CppMethod, selfType string) string {
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tmp := make([]string, 0, len(m.Parameters)+1)
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if selfType != "" {
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tmp = append(tmp, selfType+" self")
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}
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for _, p := range m.Parameters {
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if p.ParameterType == "QString" {
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// The Go code has called this with two arguments: char* and len
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// Declare that we take two parameters
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tmp = append(tmp, "const char* "+p.ParameterName+", size_t "+p.ParameterName+"_Strlen")
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} else if (p.ByRef || p.Pointer) && p.QtClassType() {
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// Pointer to Qt type
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// Replace with taking our PQ typedef by value
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tmp = append(tmp, "P"+p.ParameterType+" "+p.ParameterName)
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} else if p.QtClassType() {
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// Qt type passed by value
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// The CABI will unconditionally take these by pointer and dereference them
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// when passing to C++
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tmp = append(tmp, "P"+p.ParameterType+" "+p.ParameterName)
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} else {
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// RenderTypeCpp renders both pointer+reference as pointers
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tmp = append(tmp, p.RenderTypeCpp()+" "+p.ParameterName)
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}
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}
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// If the return type is QString, we need to handle returns via extra CABI
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// parameters
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// Qt C++: memory is in QString RAII
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// CABI: memory is moved into C.malloc/C.free
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// Go: converted to native Go string
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if m.ReturnType.ParameterType == "QString" {
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tmp = append(tmp, "char** _out, size_t* _out_Strlen")
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/*
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} else if m.ReturnType.QtClassType() && !m.ReturnType.Pointer {
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tmp = append(tmp, "P"+m.ReturnType.ParameterType+" _out")
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*/
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}
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return strings.Join(tmp, ", ")
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}
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func emitParametersCABI2CppForwarding(params []CppParameter) (preamble string, forwarding string) {
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tmp := make([]string, 0, len(params)+1)
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for _, p := range params {
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if p.ParameterType == "QString" {
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// The CABI has accepted two parameters - need to convert to one real QString
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// Create it on the stack
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preamble += "\tQString " + p.ParameterName + "_QString = QString::fromUtf8(" + p.ParameterName + ", " + p.ParameterName + "_Strlen);\n"
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tmp = append(tmp, p.ParameterName+"_QString")
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} else if p.ByRef {
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// We changed RenderTypeCpp() to render this as a pointer
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// Need to dereference so we can pass as reference to the actual Qt C++ function
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//tmp = append(tmp, "*"+p.ParameterName)
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tmp = append(tmp, "*static_cast<"+p.ParameterType+"*>("+p.ParameterName+")")
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} else if p.QtClassType() && !p.Pointer {
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// CABI takes all Qt types by pointer, even if C++ wants them by value
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// Dereference the passed-in pointer
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tmp = append(tmp, "*static_cast<"+p.ParameterType+"*>("+p.ParameterName+")")
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} else {
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tmp = append(tmp, p.ParameterName)
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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 emitBindingHeader(src *CppParsedHeader, filename string) (string, error) {
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ret := strings.Builder{}
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includeGuard := "GEN_" + strings.ToUpper(strings.Replace(filename, `.`, `_`, -1))
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ret.WriteString(`#ifndef ` + includeGuard + `
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#define ` + includeGuard + `
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#include <stdbool.h>
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#include <stddef.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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`)
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// Find all referenced Qt types in this file, and generate PVoid typedefs
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// for them
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foundTypes := map[string]struct{}{}
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for _, c := range src.Classes {
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foundTypes[c.ClassName] = struct{}{}
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for _, ctor := range c.Ctors {
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for _, p := range ctor.Parameters {
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if p.QtClassType() {
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foundTypes[p.ParameterType] = struct{}{}
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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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for _, p := range m.Parameters {
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if p.QtClassType() {
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foundTypes[p.ParameterType] = struct{}{}
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}
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}
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if m.ReturnType.QtClassType() {
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foundTypes[m.ReturnType.ParameterType] = struct{}{}
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}
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}
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}
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foundTypesList := make([]string, 0, len(foundTypes))
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for ft := range foundTypes {
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foundTypesList = append(foundTypesList, ft)
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}
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sort.Strings(foundTypesList)
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for _, ft := range foundTypesList {
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ret.WriteString(`typedef void* P` + ft + ";\n")
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}
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ret.WriteString("\n")
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for _, c := range src.Classes {
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for i, ctor := range c.Ctors {
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ret.WriteString(fmt.Sprintf("P%s %s_new%s(%s);\n", c.ClassName, maybeSuffix(i), emitParametersCabi(ctor, "")))
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}
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for _, m := range c.Methods {
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ret.WriteString(fmt.Sprintf("%s %s_%s(%s);\n", emitReturnTypeCabi(m.ReturnType), c.ClassName, m.SafeMethodName(), emitParametersCabi(m, "P"+c.ClassName)))
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}
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// delete
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ret.WriteString(fmt.Sprintf("void %s_Delete(P%s self);\n", c.ClassName, c.ClassName))
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ret.WriteString("\n")
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}
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ret.WriteString(
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`#ifdef __cplusplus
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} /* extern C */
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#endif
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#endif
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`)
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return ret.String(), nil
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}
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func emitBindingCpp(src *CppParsedHeader, filename string) (string, error) {
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ret := strings.Builder{}
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ret.WriteString(`#include "gen_` + filename + `"
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#include "` + filename + `"
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`)
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for _, c := range src.Classes {
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for i, ctor := range c.Ctors {
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preamble, forwarding := emitParametersCABI2CppForwarding(ctor.Parameters)
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ret.WriteString(fmt.Sprintf(
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"P%s %s_new%s(%s) {\n"+
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"%s"+
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"\treturn new %s(%s);\n"+
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"}\n"+
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"\n",
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c.ClassName, maybeSuffix(i), emitParametersCabi(ctor, ""),
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preamble,
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c.ClassName, forwarding,
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))
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}
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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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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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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 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 Go-allocated POCO\n"
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// afterCall += "\t_*out = ret;\n"
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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" + m.ReturnType.ParameterType + ">(new " + m.ReturnType.ParameterType + "(ret));\n"
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}
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preamble, forwarding := emitParametersCABI2CppForwarding(m.Parameters)
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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%sstatic_cast<%s*>(self)->%s(%s);\n"+
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"%s"+
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"}\n"+
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"\n",
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emitReturnTypeCabi(m.ReturnType), c.ClassName, m.SafeMethodName(), emitParametersCabi(m, "P"+c.ClassName),
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preamble,
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shouldReturn, c.ClassName, m.MethodName, forwarding,
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afterCall,
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))
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}
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// Delete
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ret.WriteString(fmt.Sprintf(
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"void %s_Delete(P%s self) {\n"+
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"\tdelete static_cast<%s*>(self);\n"+
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"}\n"+
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"\n",
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c.ClassName, c.ClassName,
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c.ClassName,
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))
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}
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return ret.String(), nil
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}
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