miqt/cmd/genbindings/emitcabi.go

157 lines
3.9 KiB
Go

package main
import (
"fmt"
"strings"
)
func (p CppParameter) RenderTypeCpp() string {
ret := p.ParameterType
if p.Pointer || p.ByRef {
ret += "*"
}
return ret // ignore const
}
func emitParametersCpp(params []CppParameter, selfType string) string {
tmp := make([]string, 0, len(params)+1)
if selfType != "" {
tmp = append(tmp, "self "+selfType)
}
for _, p := range params {
if p.ParameterType == "QString" {
// The Go code has called this with two arguments: char* and len
// Declare that we take two parameters
tmp = append(tmp, "const char* "+p.ParameterName+", size_t "+p.ParameterName+"_Strlen")
} else if (p.ByRef || p.Pointer) && p.ParameterType[0] == 'Q' {
// Pointer to Qt type
// Replace with taking our PQ typedef by value
tmp = append(tmp, "P"+p.ParameterType+" "+p.ParameterName)
} else {
// RenderTypeCpp renders both pointer+reference as pointers
tmp = append(tmp, p.RenderTypeCpp()+" "+p.ParameterName)
}
}
return strings.Join(tmp, ", ")
}
func emitParametersCABI2CppForwarding(params []CppParameter, selfType string) (preamble string, forwarding string) {
tmp := make([]string, 0, len(params)+1)
if selfType != "" {
tmp = append(tmp, "self")
}
for _, p := range params {
if p.ParameterType == "QString" {
// The CABI has accepted two parameters - need to convert to one real QString
// Create it on the stack
preamble += "\tQString " + p.ParameterName + "_QString(" + p.ParameterName + ", " + p.ParameterName + "_Strlen);\n"
tmp = append(tmp, p.ParameterName+"_QString")
} else if p.ByRef {
// We changed RenderTypeCpp() to render this as a pointer
// Need to dereference so we can pass as reference to the actual Qt C++ function
tmp = append(tmp, "*"+p.ParameterName)
} else {
tmp = append(tmp, p.ParameterName)
}
}
return preamble, strings.Join(tmp, ", ")
}
func emitBindingHeader(src *CppParsedHeader, filename string) (string, error) {
ret := strings.Builder{}
includeGuard := "GEN_" + strings.ToUpper(strings.Replace(filename, `.`, `_`, -1))
ret.WriteString(`#ifndef ` + includeGuard + `
#define ` + includeGuard + `
#include <stdbool.h>
#ifdef __cplusplus
extern "C" {
#endif
`)
for _, c := range src.Classes {
ret.WriteString(`typedef void* P` + c.ClassName + ";\n\n")
for i, ctor := range c.Ctors {
ret.WriteString(fmt.Sprintf("P%s %s_new%s(%s);\n", c.ClassName, maybeSuffix(i), emitParametersCpp(ctor.Parameters, "")))
}
for _, m := range c.Methods {
ret.WriteString(fmt.Sprintf("%s %s_%s(%s);\n", m.ReturnType.RenderTypeCpp(), c.ClassName, m.SafeMethodName(), emitParametersCpp(m.Parameters, "P"+c.ClassName)))
}
ret.WriteString("\n")
}
ret.WriteString(`
#ifdef __cplusplus
} /* extern C */
#endif
#endif
`)
return ret.String(), nil
}
func emitBindingCpp(src *CppParsedHeader, filename string) (string, error) {
ret := strings.Builder{}
ret.WriteString(`#include "gen_` + filename + `"
#include "` + filename + `"
`)
for _, c := range src.Classes {
for i, ctor := range c.Ctors {
preamble, forwarding := emitParametersCABI2CppForwarding(ctor.Parameters, "")
ret.WriteString(fmt.Sprintf(
"P%s %s_new%s(%s) {\n"+
"%s"+
"\treturn new %s(%s);\n"+
"}\n"+
"\n",
c.ClassName, maybeSuffix(i), emitParametersCpp(ctor.Parameters, ""),
preamble,
c.ClassName, forwarding,
))
}
for _, m := range c.Methods {
// Need to take an extra 'self' parameter
shouldReturn := "return "
if m.ReturnType.ParameterType == "void" {
shouldReturn = ""
}
preamble, forwarding := emitParametersCABI2CppForwarding(m.Parameters, c.ClassName)
ret.WriteString(fmt.Sprintf(
"%s %s_%s(%s) {\n"+
"%s"+
"\t%sstatic_cast<%s*>(self)->%s(%s);\n"+
"}\n"+
"\n",
m.ReturnType.RenderTypeCpp(), c.ClassName, m.SafeMethodName(), emitParametersCpp(m.Parameters, "P"+c.ClassName),
preamble,
shouldReturn, c.ClassName, m.MethodName, forwarding,
))
}
}
return ret.String(), nil
}