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cgo: implement struct types

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Not complete: packed structs are treated as regular structs.
This commit is contained in:
Ayke van Laethem
2019-04-11 14:03:08 +02:00
committed by Ron Evans
parent bd8e47af80
commit 684543b7f1
4 changed files with 73 additions and 4 deletions
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loader/libclang.go
+64 -4
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@@ -17,7 +17,8 @@ import (
#include <clang-c/Index.h> // if this fails, install libclang-8-dev
#include <stdlib.h>
int tinygo_clang_visitor(CXCursor c, CXCursor parent, CXClientData client_data);
int tinygo_clang_globals_visitor(CXCursor c, CXCursor parent, CXClientData client_data);
int tinygo_clang_struct_visitor(CXCursor c, CXCursor parent, CXClientData client_data);
*/
import "C"
@@ -123,13 +124,13 @@ func (info *fileInfo) parseFragment(fragment string, cflags []string, posFilenam
ref := refMap.Put(info)
defer refMap.Remove(ref)
cursor := C.clang_getTranslationUnitCursor(unit)
C.clang_visitChildren(cursor, C.CXCursorVisitor(C.tinygo_clang_visitor), C.CXClientData(ref))
C.clang_visitChildren(cursor, C.CXCursorVisitor(C.tinygo_clang_globals_visitor), C.CXClientData(ref))
return nil
}
//export tinygo_clang_visitor
func tinygo_clang_visitor(c, parent C.CXCursor, client_data C.CXClientData) C.int {
//export tinygo_clang_globals_visitor
func tinygo_clang_globals_visitor(c, parent C.CXCursor, client_data C.CXClientData) C.int {
info := refMap.Get(unsafe.Pointer(client_data)).(*fileInfo)
kind := C.clang_getCursorKind(c)
switch kind {
@@ -284,6 +285,34 @@ func (info *fileInfo) makeASTType(typ C.CXType) ast.Expr {
Name: "byte",
},
}
case C.CXType_Typedef:
typedefName := getString(C.clang_getTypedefName(typ))
return &ast.Ident{
NamePos: info.importCPos,
Name: "C." + typedefName,
}
case C.CXType_Elaborated:
underlying := C.clang_Type_getNamedType(typ)
return info.makeASTType(underlying)
case C.CXType_Record:
cursor := C.clang_getTypeDeclaration(typ)
switch C.clang_getCursorKind(cursor) {
case C.CXCursor_StructDecl:
fieldList := &ast.FieldList{
Opening: info.importCPos,
Closing: info.importCPos,
}
ref := refMap.Put(struct {
fieldList *ast.FieldList
info *fileInfo
}{fieldList, info})
defer refMap.Remove(ref)
C.clang_visitChildren(cursor, C.CXCursorVisitor(C.tinygo_clang_struct_visitor), C.CXClientData(uintptr(ref)))
return &ast.StructType{
Struct: info.importCPos,
Fields: fieldList,
}
}
}
if typeName == "" {
// Fallback, probably incorrect but at least the error points to an odd
@@ -295,3 +324,34 @@ func (info *fileInfo) makeASTType(typ C.CXType) ast.Expr {
Name: typeName,
}
}
//export tinygo_clang_struct_visitor
func tinygo_clang_struct_visitor(c, parent C.CXCursor, client_data C.CXClientData) C.int {
passed := refMap.Get(unsafe.Pointer(client_data)).(struct {
fieldList *ast.FieldList
info *fileInfo
})
fieldList := passed.fieldList
info := passed.info
if C.clang_getCursorKind(c) != C.CXCursor_FieldDecl {
panic("expected field inside cursor")
}
name := getString(C.clang_getCursorSpelling(c))
typ := C.clang_getCursorType(c)
field := &ast.Field{
Type: info.makeASTType(typ),
}
field.Names = []*ast.Ident{
&ast.Ident{
NamePos: info.importCPos,
Name: name,
Obj: &ast.Object{
Kind: ast.Var,
Name: name,
Decl: field,
},
},
}
fieldList.List = append(fieldList.List, field)
return C.CXChildVisit_Continue
}