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cgo: add support for enum types

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Enum types are implemented as named types (with possible accompanying
typedefs as type aliases). The constants inside the enums are treated as
Go constants like in the Go toolchain.
This commit is contained in:
Ayke van Laethem
2019-05-16 22:16:58 +02:00
committed by Ron Evans
parent 82dc14b741
commit dfa713040a
7 changed files with 159 additions and 0 deletions
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cgo/libclang.go
+44
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@@ -49,9 +49,12 @@ GoCXCursor tinygo_clang_Cursor_getArgument(GoCXCursor c, unsigned i);
CXSourceLocation tinygo_clang_getCursorLocation(GoCXCursor c);
CXSourceRange tinygo_clang_getCursorExtent(GoCXCursor c);
CXTranslationUnit tinygo_clang_Cursor_getTranslationUnit(GoCXCursor c);
long long tinygo_clang_getEnumConstantDeclValue(GoCXCursor c);
CXType tinygo_clang_getEnumDeclIntegerType(GoCXCursor c);
int tinygo_clang_globals_visitor(GoCXCursor c, GoCXCursor parent, CXClientData client_data);
int tinygo_clang_struct_visitor(GoCXCursor c, GoCXCursor parent, CXClientData client_data);
int tinygo_clang_enum_visitor(GoCXCursor c, GoCXCursor parent, CXClientData client_data);
*/
import "C"
@@ -501,6 +504,8 @@ func (p *cgoPackage) makeASTType(typ C.CXType, pos token.Pos) ast.Expr {
switch underlying.kind {
case C.CXType_Record:
return p.makeASTType(underlying, pos)
case C.CXType_Enum:
return p.makeASTType(underlying, pos)
default:
panic("unknown elaborated type")
}
@@ -580,6 +585,32 @@ func (p *cgoPackage) makeASTType(typ C.CXType, pos token.Pos) ast.Expr {
NamePos: pos,
Name: "C." + cgoName,
}
case C.CXType_Enum:
cursor := C.tinygo_clang_getTypeDeclaration(typ)
name := getString(C.tinygo_clang_getCursorSpelling(cursor))
underlying := C.tinygo_clang_getEnumDeclIntegerType(cursor)
if name == "" {
// anonymous enum
ref := storedRefs.Put(p)
defer storedRefs.Remove(ref)
C.tinygo_clang_visitChildren(cursor, C.CXCursorVisitor(C.tinygo_clang_enum_visitor), C.CXClientData(ref))
return p.makeASTType(underlying, pos)
} else {
// named enum
if _, ok := p.enums[name]; !ok {
ref := storedRefs.Put(p)
defer storedRefs.Remove(ref)
C.tinygo_clang_visitChildren(cursor, C.CXCursorVisitor(C.tinygo_clang_enum_visitor), C.CXClientData(ref))
p.enums[name] = enumInfo{
typeExpr: p.makeASTType(underlying, pos),
pos: pos,
}
}
return &ast.Ident{
NamePos: pos,
Name: "C.enum_" + name,
}
}
}
if typeName == "" {
// Fallback, probably incorrect but at least the error points to an odd
@@ -622,3 +653,16 @@ func tinygo_clang_struct_visitor(c, parent C.GoCXCursor, client_data C.CXClientD
fieldList.List = append(fieldList.List, field)
return C.CXChildVisit_Continue
}
//export tinygo_clang_enum_visitor
func tinygo_clang_enum_visitor(c, parent C.GoCXCursor, client_data C.CXClientData) C.int {
p := storedRefs.Get(unsafe.Pointer(client_data)).(*cgoPackage)
name := getString(C.tinygo_clang_getCursorSpelling(c))
pos := p.getCursorPosition(c)
value := C.tinygo_clang_getEnumConstantDeclValue(c)
p.constants[name] = constantInfo{
expr: &ast.BasicLit{pos, token.INT, strconv.FormatInt(int64(value), 10)},
pos: pos,
}
return C.CXChildVisit_Continue
}