mirror of
https://github.com/bloeys/cogo.git
synced 2025-12-29 08:58:19 +00:00
490 lines
10 KiB
Go
Executable File
490 lines
10 KiB
Go
Executable File
package main
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import (
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"fmt"
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"go/ast"
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"go/format"
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"go/token"
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"io"
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"os"
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"strings"
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"golang.org/x/tools/go/ast/astutil"
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"golang.org/x/tools/go/packages"
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"golang.org/x/tools/imports"
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)
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func printDebugInfo() {
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fmt.Printf("Running inliner on '%s'\n", os.Getenv("GOFILE"))
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cwd, err := os.Getwd()
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if err != nil {
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panic(err)
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}
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fmt.Printf(" cwd = %s\n", cwd)
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fmt.Printf(" os.Args = %#v\n\n", os.Args)
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}
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func main() {
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printDebugInfo()
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cwd, err := os.Getwd()
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if err != nil {
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panic(err)
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}
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genCogoFuncs(cwd)
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genHasGenChecksOnOriginalFuncs(cwd)
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}
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func genCogoFuncs(cwd string) {
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pkgs, err := packages.Load(&packages.Config{
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Dir: cwd,
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Mode: packages.NeedName | packages.NeedTypes | packages.NeedTypesInfo | packages.NeedSyntax,
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Tests: false,
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})
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if err != nil {
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panic(err)
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}
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// if len(pkgs) != 1 {
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// panic(fmt.Sprintf("expected to find one package but found %d", len(pkgs)))
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// }
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for _, pkg := range pkgs {
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p := &processor{
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fset: pkg.Fset,
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funcDeclsToWrite: []*ast.FuncDecl{},
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}
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for i, synFile := range pkg.Syntax {
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pkg.Syntax[i] = astutil.Apply(synFile, p.genCogoFuncsNodeProcessor, nil).(*ast.File)
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if len(p.funcDeclsToWrite) > 0 {
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root := &ast.File{
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Name: synFile.Name,
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Imports: synFile.Imports,
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Decls: []ast.Decl{},
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}
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for _, v := range p.funcDeclsToWrite {
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root.Decls = append(root.Decls, &ast.FuncDecl{
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Name: ast.NewIdent(v.Name.Name + "_cogo"),
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Type: v.Type,
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Body: v.Body,
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})
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}
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origFName := pkg.Fset.File(synFile.Pos()).Name()
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newFName := strings.Split(origFName, ".")[0] + ".cogo.go"
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writeAst(newFName, "// Code generated by 'cogo'; DO NOT EDIT.\n", pkg.Fset, root)
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p.funcDeclsToWrite = p.funcDeclsToWrite[:0]
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}
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}
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}
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}
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func genHasGenChecksOnOriginalFuncs(cwd string) {
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pkgs, err := packages.Load(&packages.Config{
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Dir: cwd,
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Mode: packages.NeedName | packages.NeedTypes | packages.NeedTypesInfo | packages.NeedSyntax,
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Tests: false,
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})
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if err != nil {
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panic(err)
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}
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// if len(pkgs) != 1 {
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// panic(fmt.Sprintf("expected to find one package but found %d", len(pkgs)))
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// }
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for _, pkg := range pkgs {
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p := &processor{
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fset: pkg.Fset,
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funcDeclsToWrite: []*ast.FuncDecl{},
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}
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for i, synFile := range pkg.Syntax {
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pkg.Syntax[i] = astutil.Apply(synFile, p.genHasGenChecksOnOriginalFuncsNodeProcessor, nil).(*ast.File)
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if len(p.funcDeclsToWrite) > 0 {
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origFName := pkg.Fset.File(synFile.Pos()).Name()
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writeAst(origFName, "", pkg.Fset, pkg.Syntax[i])
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p.funcDeclsToWrite = p.funcDeclsToWrite[:0]
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}
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}
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}
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}
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type processor struct {
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fset *token.FileSet
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funcDeclsToWrite []*ast.FuncDecl
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}
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func (p *processor) genCogoFuncsNodeProcessor(c *astutil.Cursor) bool {
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n := c.Node()
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if n == nil {
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return false
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}
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funcDecl, ok := n.(*ast.FuncDecl)
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if !ok || funcDecl.Body == nil {
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return true
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}
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coroutineParamName := getCoroutineParamNameFromFuncDecl(funcDecl)
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if coroutineParamName == "" || !funcDeclCallsCoroutineBegin(funcDecl, coroutineParamName) {
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return false
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}
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beginBodyListIndex := -1
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lastCaseEndBodyListIndex := -1
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switchStmt := &ast.SwitchStmt{
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Tag: ast.NewIdent(coroutineParamName + ".State"),
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Body: &ast.BlockStmt{
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List: []ast.Stmt{},
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},
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}
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for i, stmt := range funcDecl.Body.List {
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var cogoFuncSelExpr *ast.SelectorExpr
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ifStmt, ok := stmt.(*ast.IfStmt)
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if ok && ifStmtIsHasGen(ifStmt) {
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funcDecl.Body.List[i] = &ast.EmptyStmt{}
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continue
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}
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// Find functions calls in the style of 'xyz.ABC123()'
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exprStmt, exprStmtOk := stmt.(*ast.ExprStmt)
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if !exprStmtOk {
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continue
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}
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callExpr, exprStmtOk := exprStmt.X.(*ast.CallExpr)
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if !exprStmtOk {
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continue
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}
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cogoFuncSelExpr, exprStmtOk = callExpr.Fun.(*ast.SelectorExpr)
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if !exprStmtOk {
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continue
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}
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if !funcCallHasLhsName(cogoFuncSelExpr, coroutineParamName) {
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continue
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}
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// cogoFuncCallLineNum := p.fset.File(cogoFuncSelExpr.Pos()).Line(cogoFuncSelExpr.Pos())
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// Now that we found a call to cogo decide what to do
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if cogoFuncSelExpr.Sel.Name == "Begin" {
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beginBodyListIndex = i
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lastCaseEndBodyListIndex = i
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continue
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} else if cogoFuncSelExpr.Sel.Name == "Yield" {
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// Add everything from the last begin/yield until this yield into a case
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stmtsSinceLastCogo := funcDecl.Body.List[lastCaseEndBodyListIndex+1 : i]
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caseStmts := make([]ast.Stmt, 0, len(stmtsSinceLastCogo)+2)
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caseStmts = append(caseStmts, stmtsSinceLastCogo...)
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caseStmts = append(caseStmts,
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&ast.IncDecStmt{
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Tok: token.INC,
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X: ast.NewIdent(coroutineParamName + ".State"),
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},
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&ast.ReturnStmt{
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Results: callExpr.Args,
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},
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)
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switchStmt.Body.List = append(switchStmt.Body.List,
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getCaseWithStmts(
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[]ast.Expr{ast.NewIdent(fmt.Sprint(len(switchStmt.Body.List)))},
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caseStmts,
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),
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)
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lastCaseEndBodyListIndex = i
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}
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}
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// Add everything after the last yield in a separate case
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stmtsToEndOfFunc := funcDecl.Body.List[lastCaseEndBodyListIndex+1:]
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caseStmts := make([]ast.Stmt, 0, len(stmtsToEndOfFunc)+1)
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caseStmts = append(caseStmts,
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&ast.AssignStmt{
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Lhs: []ast.Expr{ast.NewIdent(coroutineParamName + ".State")},
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Tok: token.ASSIGN,
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Rhs: []ast.Expr{ast.NewIdent("-1")},
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},
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)
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caseStmts = append(caseStmts, stmtsToEndOfFunc...)
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switchStmt.Body.List = append(switchStmt.Body.List,
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getCaseWithStmts(
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[]ast.Expr{ast.NewIdent(fmt.Sprint(len(switchStmt.Body.List)))},
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caseStmts,
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),
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// default case
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getCaseWithStmts(
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nil,
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[]ast.Stmt{
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&ast.AssignStmt{
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Lhs: []ast.Expr{ast.NewIdent(coroutineParamName + ".State")},
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Tok: token.ASSIGN,
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Rhs: []ast.Expr{ast.NewIdent("-1")},
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},
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&ast.ReturnStmt{},
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},
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),
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)
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// Apply changes
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funcDecl.Body.List = funcDecl.Body.List[:beginBodyListIndex]
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funcDecl.Body.List = append(funcDecl.Body.List,
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switchStmt,
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)
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originalList := funcDecl.Body.List
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funcDecl.Body.List = make([]ast.Stmt, 0, len(funcDecl.Body.List)+1)
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funcDecl.Body.List = append(funcDecl.Body.List, originalList...)
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p.funcDeclsToWrite = append(p.funcDeclsToWrite, funcDecl)
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return true
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}
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func (p *processor) genHasGenChecksOnOriginalFuncsNodeProcessor(c *astutil.Cursor) bool {
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n := c.Node()
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if n == nil {
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return false
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}
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funcDecl, ok := n.(*ast.FuncDecl)
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if !ok || funcDecl.Body == nil {
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return true
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}
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coroutineParamName := getCoroutineParamNameFromFuncDecl(funcDecl)
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if coroutineParamName == "" || !funcDeclCallsCoroutineBegin(funcDecl, coroutineParamName) {
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return false
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}
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for i, stmt := range funcDecl.Body.List {
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// If one already exists update it and return
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ifStmt, ok := stmt.(*ast.IfStmt)
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if ok && ifStmtIsHasGen(ifStmt) {
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funcDecl.Body.List[i] = createHasGenIfStmt(funcDecl, coroutineParamName)
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p.funcDeclsToWrite = append(p.funcDeclsToWrite, funcDecl)
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return true
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}
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}
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// If the check doesn't exist add it to the beginning of the function
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origList := funcDecl.Body.List
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funcDecl.Body.List = make([]ast.Stmt, 0, len(origList)+1)
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funcDecl.Body.List = append(funcDecl.Body.List, createHasGenIfStmt(funcDecl, coroutineParamName))
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funcDecl.Body.List = append(funcDecl.Body.List, origList...)
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p.funcDeclsToWrite = append(p.funcDeclsToWrite, funcDecl)
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return true
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}
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func createHasGenIfStmt(funcDecl *ast.FuncDecl, coroutineParamName string) *ast.IfStmt {
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return &ast.IfStmt{
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Cond: createStmtFromSelFuncCall("cogo", "HasGen").(*ast.ExprStmt).X,
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Body: &ast.BlockStmt{
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List: []ast.Stmt{
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&ast.ReturnStmt{
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Results: []ast.Expr{&ast.CallExpr{
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Fun: ast.NewIdent(funcDecl.Name.Name + "_cogo"),
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Args: []ast.Expr{ast.NewIdent(coroutineParamName)},
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}},
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},
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},
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},
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}
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}
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func ifStmtIsHasGen(stmt *ast.IfStmt) bool {
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callExpr, ok := stmt.Cond.(*ast.CallExpr)
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if !ok {
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return false
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}
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selExpr, ok := callExpr.Fun.(*ast.SelectorExpr)
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if !ok {
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return false
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}
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return selExprIs(selExpr, "cogo", "HasGen")
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}
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func createStmtFromSelFuncCall(lhs, rhs string) ast.Stmt {
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return &ast.ExprStmt{
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X: &ast.CallExpr{
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Fun: &ast.SelectorExpr{
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X: ast.NewIdent(lhs),
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Sel: ast.NewIdent(rhs),
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},
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},
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}
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}
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func funcDeclCallsCoroutineBegin(fd *ast.FuncDecl, coroutineParamName string) bool {
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if fd.Body == nil || len(fd.Body.List) == 0 {
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return false
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}
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for _, stmt := range fd.Body.List {
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// Find functions calls in the style of 'cogo.ABC123()'
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exprStmt, ok := stmt.(*ast.ExprStmt)
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if !ok {
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continue
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}
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callExpr, ok := exprStmt.X.(*ast.CallExpr)
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if !ok {
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continue
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}
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pkgFuncCallExpr, ok := callExpr.Fun.(*ast.SelectorExpr)
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if !ok {
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continue
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}
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if funcCallHasLhsName(pkgFuncCallExpr, coroutineParamName) {
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return true
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}
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}
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return false
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}
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func getCoroutineParamNameFromFuncDecl(fd *ast.FuncDecl) string {
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for _, p := range fd.Type.Params.List {
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ptrExpr, ok := p.Type.(*ast.StarExpr)
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if !ok {
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continue
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}
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// indexList because coroutine type takes multiple generic parameters, creating an indexed list
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indexListExpr, ok := ptrExpr.X.(*ast.IndexListExpr)
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if !ok {
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continue
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}
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selExpr, ok := indexListExpr.X.(*ast.SelectorExpr)
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if !ok {
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continue
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}
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if !selExprIs(selExpr, "cogo", "Coroutine") {
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continue
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}
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return p.Names[0].Name
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}
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return ""
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}
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// func getIdentNameFromExprOrPanic(e ast.Expr) string {
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// return e.(*ast.Ident).Name
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// }
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func funcCallHasLhsName(selExpr *ast.SelectorExpr, pkgName string) bool {
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pkgIdent, ok := selExpr.X.(*ast.Ident)
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return ok && pkgIdent.Name == pkgName
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}
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func selExprIs(selExpr *ast.SelectorExpr, pkgName, typeName string) bool {
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pkgIdentExpr, ok := selExpr.X.(*ast.Ident)
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if !ok {
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return false
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}
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return pkgIdentExpr.Name == pkgName && selExpr.Sel.Name == typeName
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}
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// func filter[T any](arr []T, where func(x T) bool) []T {
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// out := []T{}
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// for i := 0; i < len(arr); i++ {
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// if !where(arr[i]) {
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// continue
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// }
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// out = append(out, arr[i])
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// }
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// return out
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// }
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func getCaseWithStmts(caseConditions []ast.Expr, stmts []ast.Stmt) *ast.CaseClause {
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return &ast.CaseClause{
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List: caseConditions,
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Body: stmts,
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}
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}
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func writeAst(fName, topComment string, fset *token.FileSet, node any) {
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f, err := os.Create(fName)
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if err != nil {
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panic("Failed to create file to write new AST. Err: " + err.Error())
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}
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defer f.Close()
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if topComment != "" {
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f.WriteString(topComment)
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}
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err = format.Node(f, fset, node)
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if err != nil {
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panic(err.Error())
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}
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b, err := imports.Process(fName, nil, nil)
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if err != nil {
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panic("Failed to process imports on file " + fName + ". Err: " + err.Error())
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}
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f.Seek(0, io.SeekStart)
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_, err = f.Write(b)
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if err != nil {
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panic(err.Error())
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}
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}
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