mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-11-15 07:27:32 +01:00
84 lines
2.1 KiB
Go
84 lines
2.1 KiB
Go
// Copyright 2024 The Ebitengine Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package debug
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import (
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"go/build"
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"path"
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"path/filepath"
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"runtime"
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"strings"
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"sync"
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)
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var (
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ebitengineFileDir string
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ebitengineFileDirOnce sync.Once
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)
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type CallerType int
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const (
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CallerTypeNone CallerType = iota
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CallerTypeRegular
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CallerTypeInternal
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)
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// FirstCaller returns the file and line number of the first caller outside of Ebitengine.
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func FirstCaller() (file string, line int, callerType CallerType) {
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ebitengineFileDirOnce.Do(func() {
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pkg, err := build.Default.Import("github.com/hajimehoshi/ebiten/v2", "", build.FindOnly)
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if err != nil {
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return
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}
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ebitengineFileDir = filepath.ToSlash(pkg.Dir)
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})
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if ebitengineFileDir == "" {
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return "", 0, CallerTypeNone
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}
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// Relying on a caller stacktrace is very fragile, but this is fine as this is only for debugging.
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var ebitenPackageReached bool
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for i := 0; ; i++ {
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_, file, line, ok := runtime.Caller(i)
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if !ok {
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break
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}
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// The file should be with a slash, but just in case, convert it.
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file = filepath.ToSlash(file)
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if !ebitenPackageReached {
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if path.Dir(file) == ebitengineFileDir {
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ebitenPackageReached = true
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}
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continue
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}
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if path.Dir(file) == ebitengineFileDir {
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continue
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}
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if strings.HasPrefix(path.Dir(file), ebitengineFileDir+"/") && !strings.HasPrefix(path.Dir(file), ebitengineFileDir+"/examples/") {
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if strings.HasPrefix(path.Dir(file), ebitengineFileDir+"/internal/") {
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return file, line, CallerTypeInternal
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}
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continue
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}
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return file, line, CallerTypeRegular
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}
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return "", 0, CallerTypeNone
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}
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