60 lines
1.6 KiB
Go
60 lines
1.6 KiB
Go
// Copyright 2019 The Cockroach 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
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// implied. See the License for the specific language governing
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// permissions and limitations under the License.
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package withstack
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import (
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"fmt"
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"runtime"
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"github.com/cockroachdb/errors/errbase"
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)
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// stack represents a stack of program counters.
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// This mirrors the (non-exported) type of the same name in github.com/pkg/errors.
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type stack []uintptr
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// Format mirrors the code in github.com/pkg/errors.
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func (s *stack) Format(st fmt.State, verb rune) {
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switch verb {
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case 'v':
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switch {
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case st.Flag('+'):
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for _, pc := range *s {
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f := errbase.StackFrame(pc)
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fmt.Fprintf(st, "\n%+v", f)
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}
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}
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}
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}
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// StackTrace mirrors the code in github.com/pkg/errors.
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func (s *stack) StackTrace() errbase.StackTrace {
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f := make([]errbase.StackFrame, len(*s))
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for i := 0; i < len(f); i++ {
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f[i] = errbase.StackFrame((*s)[i])
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}
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return f
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}
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// callers mirrors the code in github.com/pkg/errors,
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// but makes the depth customizable.
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func callers(depth int) *stack {
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const numFrames = 32
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var pcs [numFrames]uintptr
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n := runtime.Callers(2+depth, pcs[:])
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var st stack = pcs[0:n]
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return &st
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}
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