309 lines
6.3 KiB
Go
309 lines
6.3 KiB
Go
// Copyright 2014 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// +build ignore
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// The gendebug program takes gl.go and generates a version of it
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// where each function includes tracing code that writes its arguments
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// to the standard log.
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package main
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import (
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"bytes"
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"fmt"
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"go/ast"
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"go/format"
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"go/parser"
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"go/printer"
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"go/token"
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"log"
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"os"
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"strconv"
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)
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var fset = new(token.FileSet)
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func typeString(t ast.Expr) string {
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buf := new(bytes.Buffer)
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printer.Fprint(buf, fset, t)
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return buf.String()
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}
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func typePrinter(t string) string {
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switch t {
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case "[]float32", "[]byte":
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return "len(%d)"
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}
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return "%v"
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}
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func typePrinterArg(t, name string) string {
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switch t {
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case "[]float32", "[]byte":
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return "len(" + name + ")"
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}
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return name
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}
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func main() {
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f, err := parser.ParseFile(fset, "consts.go", nil, parser.ParseComments)
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if err != nil {
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fmt.Fprintf(os.Stderr, err.Error())
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os.Exit(1)
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}
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entries := enum(f)
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f, err = parser.ParseFile(fset, "gl.go", nil, parser.ParseComments)
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if err != nil {
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fmt.Fprintf(os.Stderr, err.Error())
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os.Exit(1)
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}
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buf := new(bytes.Buffer)
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fmt.Fprint(buf, preamble)
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fmt.Fprintf(buf, "func (v Enum) String() string {\n")
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fmt.Fprintf(buf, "\tswitch v {\n")
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for _, e := range dedup(entries) {
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fmt.Fprintf(buf, "\tcase 0x%x: return %q\n", e.value, e.name)
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}
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fmt.Fprintf(buf, "\t%s\n", `default: return fmt.Sprintf("gl.Enum(0x%x)", uint32(v))`)
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fmt.Fprintf(buf, "\t}\n")
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fmt.Fprintf(buf, "}\n\n")
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for _, d := range f.Decls {
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// Before:
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// func StencilMask(mask uint32) {
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// C.glStencilMask(C.GLuint(mask))
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// }
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//
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// After:
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// func StencilMask(mask uint32) {
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// defer func() {
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// errstr := errDrain()
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// log.Printf("gl.StencilMask(%v) %v", mask, errstr)
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// }()
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// C.glStencilMask(C.GLuint(mask))
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// }
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fn, ok := d.(*ast.FuncDecl)
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if !ok {
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continue
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}
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if fn.Recv != nil {
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continue
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}
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var (
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params []string
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paramTypes []string
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results []string
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resultTypes []string
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)
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// Print function signature.
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fmt.Fprintf(buf, "func %s(", fn.Name.Name)
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for i, p := range fn.Type.Params.List {
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if i > 0 {
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fmt.Fprint(buf, ", ")
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}
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ty := typeString(p.Type)
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for i, n := range p.Names {
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if i > 0 {
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fmt.Fprint(buf, ", ")
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}
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fmt.Fprintf(buf, "%s ", n.Name)
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params = append(params, n.Name)
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paramTypes = append(paramTypes, ty)
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}
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fmt.Fprint(buf, ty)
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}
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fmt.Fprintf(buf, ") (")
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if fn.Type.Results != nil {
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for i, r := range fn.Type.Results.List {
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if i > 0 {
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fmt.Fprint(buf, ", ")
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}
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ty := typeString(r.Type)
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if len(r.Names) == 0 {
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name := fmt.Sprintf("r%d", i)
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fmt.Fprintf(buf, "%s ", name)
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results = append(results, name)
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resultTypes = append(resultTypes, ty)
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}
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for i, n := range r.Names {
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if i > 0 {
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fmt.Fprint(buf, ", ")
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}
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fmt.Fprintf(buf, "%s ", n.Name)
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results = append(results, n.Name)
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resultTypes = append(resultTypes, ty)
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}
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fmt.Fprint(buf, ty)
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}
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}
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fmt.Fprintf(buf, ") {\n")
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// Insert a defer block for tracing.
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fmt.Fprintf(buf, "defer func() {\n")
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fmt.Fprintf(buf, "\terrstr := errDrain()\n")
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switch fn.Name.Name {
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case "GetUniformLocation", "GetAttribLocation":
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fmt.Fprintf(buf, "\tr0.name = name\n")
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}
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fmt.Fprintf(buf, "\tlog.Printf(\"gl.%s(", fn.Name.Name)
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for i, p := range paramTypes {
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if i > 0 {
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fmt.Fprint(buf, ", ")
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}
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fmt.Fprint(buf, typePrinter(p))
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}
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fmt.Fprintf(buf, ") ")
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if len(resultTypes) > 1 {
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fmt.Fprint(buf, "(")
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}
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for i, r := range resultTypes {
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if i > 0 {
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fmt.Fprint(buf, ", ")
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}
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fmt.Fprint(buf, typePrinter(r))
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}
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if len(resultTypes) > 1 {
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fmt.Fprint(buf, ") ")
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}
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fmt.Fprintf(buf, "%%v\"")
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for i, p := range paramTypes {
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fmt.Fprintf(buf, ", %s", typePrinterArg(p, params[i]))
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}
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for i, r := range resultTypes {
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fmt.Fprintf(buf, ", %s", typePrinterArg(r, results[i]))
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}
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fmt.Fprintf(buf, ", errstr)\n")
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fmt.Fprintf(buf, "}()\n")
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// Print original body of function.
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for _, s := range fn.Body.List {
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printer.Fprint(buf, fset, s)
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fmt.Fprintf(buf, "\n")
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}
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fmt.Fprintf(buf, "}\n\n")
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}
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b, err := format.Source(buf.Bytes())
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if err != nil {
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os.Stdout.Write(buf.Bytes())
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fmt.Fprintf(os.Stderr, err.Error())
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os.Exit(1)
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}
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os.Stdout.Write(b)
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}
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const preamble = `// Copyright 2014 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Generated from gl.go. DO NOT EDIT.
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// See doc.go for details.
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// +build gldebug
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package gl
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/*
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#cgo darwin LDFLAGS: -framework OpenGL
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#cgo linux LDFLAGS: -lGLESv2
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#cgo darwin CFLAGS: -DGOOS_darwin
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#cgo linux CFLAGS: -DGOOS_linux
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#include <stdlib.h>
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#ifdef GOOS_linux
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#include <GLES2/gl2.h>
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#endif
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#ifdef GOOS_darwin
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#include <OpenGL/gl3.h>
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#endif
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*/
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import "C"
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import (
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"fmt"
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"log"
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"unsafe"
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)
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func errDrain() string {
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var errs []Enum
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for {
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e := Enum(C.glGetError())
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if e == 0 {
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break
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}
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errs = append(errs, e)
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}
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if len(errs) > 0 {
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return fmt.Sprintf(" error: %v", errs)
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}
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return ""
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}
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`
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type entry struct {
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name string
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value int
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}
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// enum builds a list of all GL constants that make up the gl.Enum type.
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func enum(f *ast.File) []entry {
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var entries []entry
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for _, d := range f.Decls {
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gendecl, ok := d.(*ast.GenDecl)
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if !ok {
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continue
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}
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if gendecl.Tok != token.CONST {
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continue
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}
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for _, s := range gendecl.Specs {
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v, ok := s.(*ast.ValueSpec)
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if !ok {
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continue
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}
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if len(v.Names) != 1 || len(v.Values) != 1 {
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continue
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}
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val, err := strconv.ParseInt(v.Values[0].(*ast.BasicLit).Value, 0, 32)
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if err != nil {
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log.Fatalf("enum %s: %v", v.Names[0].Name, err)
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}
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entries = append(entries, entry{v.Names[0].Name, int(val)})
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}
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}
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return entries
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}
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func dedup(entries []entry) []entry {
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// Find all duplicates. Use "%d" as the name of any value with duplicates.
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seen := make(map[int]int)
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for _, e := range entries {
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seen[e.value]++
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}
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var dedup []entry
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for _, e := range entries {
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switch seen[e.value] {
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case 0: // skip, already here
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case 1:
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dedup = append(dedup, e)
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default:
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// value is duplicated
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dedup = append(dedup, entry{fmt.Sprintf("%d", e.value), e.value})
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seen[e.value] = 0
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}
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}
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return dedup
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}
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