289 lines
7.3 KiB
Go
289 lines
7.3 KiB
Go
package parse
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import (
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"errors"
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"fmt"
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"os"
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"unsafe"
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"github.com/goplus/llgo/c"
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"github.com/goplus/llgo/c/clang"
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"github.com/goplus/llgo/chore/llcppg/ast"
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)
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type Converter struct {
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files map[string]*ast.File
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curLoc ast.Location
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curFile *ast.File
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index *clang.Index
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unit *clang.TranslationUnit
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// todo(zzy):current namespace expr
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}
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func NewConverter(file string, temp bool) (*Converter, error) {
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args := []*c.Char{
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c.Str("-x"),
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c.Str("c++"),
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c.Str("-std=c++11"),
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}
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index := clang.CreateIndex(0, 0)
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var unit *clang.TranslationUnit
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if temp {
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content := c.AllocaCStr(file)
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tempFile := &clang.UnsavedFile{
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Filename: c.Str("temp.h"),
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Contents: content,
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Length: c.Ulong(c.Strlen(content)),
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}
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unit = index.ParseTranslationUnit(
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tempFile.Filename,
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unsafe.SliceData(args), c.Int(len(args)),
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tempFile, 1,
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clang.DetailedPreprocessingRecord,
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)
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} else {
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unit = index.ParseTranslationUnit(
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c.AllocaCStr(file),
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unsafe.SliceData(args), c.Int(len(args)),
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nil, 0,
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clang.DetailedPreprocessingRecord,
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)
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}
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if unit == nil {
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return nil, errors.New("failed to parse translation unit")
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}
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return &Converter{
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files: make(map[string]*ast.File),
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index: index,
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unit: unit,
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}, nil
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}
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func (ct *Converter) Dispose() {
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ct.index.Dispose()
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ct.unit.Dispose()
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}
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// visit top decls (struct,class,function,enum & marco,include)
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func visit(cursor, parent clang.Cursor, clientData unsafe.Pointer) clang.ChildVisitResult {
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ct := (*Converter)(clientData)
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ct.UpdateCurFile(cursor)
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switch cursor.Kind {
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case clang.CursorInclusionDirective:
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// todo(zzy)
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return clang.ChildVisit_Continue
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case clang.CursorMacroDefinition:
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// todo(zzy)
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return clang.ChildVisit_Continue
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case clang.CursorEnumDecl:
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// todo(zzy)
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return clang.ChildVisit_Continue
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case clang.CursorClassDecl:
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ct.ProcessClass(cursor)
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return clang.ChildVisit_Continue
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case clang.CursorStructDecl:
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// todo(zzy)
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return clang.ChildVisit_Continue
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case clang.CursorFunctionDecl:
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ct.ProcessFunc(cursor)
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return clang.ChildVisit_Continue
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default:
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// non-top-level decl, continue recursion
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return clang.ChildVisit_Recurse
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}
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}
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func (ct *Converter) Convert() (map[string]*ast.File, error) {
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cursor := ct.unit.Cursor()
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// visit top decls (struct,class,function & marco,include)
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clang.VisitChildren(cursor, visit, c.Pointer(ct))
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return ct.files, nil
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}
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func (ct *Converter) UpdateCurFile(cursor clang.Cursor) {
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loc := cursor.Location()
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var file clang.File
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loc.SpellingLocation(&file, nil, nil, nil)
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filename := file.FileName()
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defer filename.Dispose()
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if filename.CStr() == nil {
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//todo(zzy): For some built-in macros, there is no file.
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return
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}
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filePath := c.GoString(filename.CStr())
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if ct.curFile == nil || ct.curFile.Path != filePath {
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if f, ok := ct.files[filePath]; ok {
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ct.curFile = f
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} else {
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ct.curFile = &ast.File{
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Path: filePath,
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Decls: make([]ast.Decl, 0),
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Includes: make([]*ast.Include, 0),
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Macros: make([]*ast.Macro, 0),
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}
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}
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ct.files[filePath] = ct.curFile
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}
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}
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func (ct *Converter) ProcessType(t clang.Type) ast.Expr {
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var expr ast.Expr
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if t.Kind >= clang.TypeFirstBuiltin && t.Kind <= clang.TypeLastBuiltin {
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return ct.ProcessBuiltinType(t)
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}
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switch t.Kind {
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case clang.TypePointer:
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expr = &ast.PointerType{X: ct.ProcessType(t.PointeeType())}
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case clang.TypeFunctionProto:
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// function type will only collect return type, params will be collected in ProcessFunc
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ret := ct.ProcessType(t.ResultType())
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expr = &ast.FuncType{Ret: ret}
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case clang.TypeTypedef:
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expr = ct.ProcessType(t.CanonicalType())
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case clang.TypeConstantArray, clang.TypeVariableArray, clang.TypeIncompleteArray, clang.TypeDependentSizedArray:
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expr = &ast.ArrayType{
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Elt: ct.ProcessType(t.ArrayElementType()),
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}
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// todo(zzy):array length
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}
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return expr
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}
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func (ct *Converter) ProcessFunc(cursor clang.Cursor) {
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name := cursor.String()
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defer name.Dispose()
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// function type will only collect return type
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// ProcessType can't get the field names,will collect in follows
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funcType, ok := ct.ProcessType(cursor.Type()).(*ast.FuncType)
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if !ok {
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fmt.Println("failed to process function type")
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return
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}
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params := ct.ProcessFuncParams(cursor)
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funcType.Params = params
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fn := &ast.FuncDecl{
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Name: &ast.Ident{Name: c.GoString(name.CStr())},
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Type: funcType,
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// todo(zzy):DeclBase use the converter's current namespace expr
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}
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ct.curFile.Decls = append(ct.curFile.Decls, fn)
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// ct.declMap[cursor] = fn
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}
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type visitParamContext struct {
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params *ast.FieldList
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converter *Converter
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}
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// visit top decls (struct,class,function,enum & marco,include)
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func visitParamDecl(cursor, parent clang.Cursor, clientData unsafe.Pointer) clang.ChildVisitResult {
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ctx := (*visitParamContext)(clientData)
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if cursor.Kind == clang.CursorParmDecl {
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paramName := cursor.String()
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defer paramName.Dispose()
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argType := ctx.converter.ProcessType(cursor.Type())
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// In C language, parameter lists do not have similar parameter grouping in Go.
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// func foo(a, b int)
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ctx.params.List = append(ctx.params.List,
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&ast.Field{
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Type: argType,
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Names: []*ast.Ident{
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{Name: c.GoString(paramName.CStr())},
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},
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})
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}
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return clang.ChildVisit_Continue
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}
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func (ct *Converter) ProcessFuncParams(cursor clang.Cursor) *ast.FieldList {
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params := &ast.FieldList{List: []*ast.Field{}}
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ctx := &visitParamContext{
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params: params,
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converter: ct,
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}
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clang.VisitChildren(cursor, visitParamDecl, c.Pointer(ctx))
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return params
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}
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func (ct *Converter) ProcessClass(cursor clang.Cursor) {
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println("todo: Process class")
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}
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func (ct *Converter) ProcessBuiltinType(t clang.Type) *ast.BuiltinType {
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kind := ast.Void
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var flags ast.TypeFlag
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switch t.Kind {
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case clang.TypeVoid:
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kind = ast.Void
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case clang.TypeBool:
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kind = ast.Bool
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case clang.TypeCharU, clang.TypeUChar, clang.TypeCharS, clang.TypeSChar:
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kind = ast.Char
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case clang.TypeChar16:
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kind = ast.Char16
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case clang.TypeChar32:
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kind = ast.Char32
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case clang.TypeWChar:
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kind = ast.WChar
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case clang.TypeShort, clang.TypeUShort:
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kind = ast.Int
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flags |= ast.Short
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case clang.TypeInt, clang.TypeUInt:
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kind = ast.Int
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case clang.TypeLong, clang.TypeULong:
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kind = ast.Int
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flags |= ast.Long
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case clang.TypeLongLong, clang.TypeULongLong:
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kind = ast.Int
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flags |= ast.LongLong
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case clang.TypeInt128, clang.TypeUInt128:
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kind = ast.Int128
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case clang.TypeFloat:
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kind = ast.Float
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case clang.TypeHalf, clang.TypeFloat16:
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kind = ast.Float16
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case clang.TypeDouble:
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kind = ast.Float
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flags |= ast.Double
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case clang.TypeLongDouble:
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kind = ast.Float
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flags |= ast.Long | ast.Double
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case clang.TypeFloat128:
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kind = ast.Float128
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default:
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// like IBM128,NullPtr,Accum
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fmt.Fprintln(os.Stderr, "todo: unknown builtin type:", c.GoString(t.Kind.String().CStr()))
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}
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if IsExplicitSigned(t) {
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flags |= ast.Signed
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} else if IsExplicitUnsigned(t) {
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flags |= ast.Unsigned
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}
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return &ast.BuiltinType{
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Kind: kind,
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Flags: flags,
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}
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}
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func IsExplicitSigned(t clang.Type) bool {
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return t.Kind == clang.TypeCharS || t.Kind == clang.TypeSChar
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}
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func IsExplicitUnsigned(t clang.Type) bool {
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return t.Kind == clang.TypeCharU || t.Kind == clang.TypeUChar ||
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t.Kind == clang.TypeUShort || t.Kind == clang.TypeUInt ||
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t.Kind == clang.TypeULong || t.Kind == clang.TypeULongLong ||
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t.Kind == clang.TypeUInt128
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}
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