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// Copyright 2020 The gVisor Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package cmd
import (
"bufio"
"context"
"os"
"strconv"
"strings"
"github.com/google/subcommands"
"gvisor.dev/gvisor/pkg/coverage"
"gvisor.dev/gvisor/runsc/flag"
)
// Symbolize implements subcommands.Command for the "symbolize" command.
type Symbolize struct {
dumpAll bool
}
// Name implements subcommands.Command.Name.
func (*Symbolize) Name() string {
return "symbolize"
}
// Synopsis implements subcommands.Command.Synopsis.
func (*Symbolize) Synopsis() string {
return "Convert synthetic instruction pointers from kcov into positions in the runsc source code. Only used when Go coverage is enabled."
}
// Usage implements subcommands.Command.Usage.
func (*Symbolize) Usage() string {
return `symbolize - converts synthetic instruction pointers into positions in the runsc source code.
This command takes instruction pointers from stdin and converts them into their
corresponding file names and line/column numbers in the runsc source code. The
inputs are not interpreted as actual addresses, but as synthetic values that are
exposed through /sys/kernel/debug/kcov. One can extract coverage information
from kcov and translate those values into locations in the source code by
running symbolize on the same runsc binary.
`
}
// SetFlags implements subcommands.Command.SetFlags.
func (c *Symbolize) SetFlags(f *flag.FlagSet) {
f.BoolVar(&c.dumpAll, "all", false, "dump information on all coverage blocks along with their synthetic PCs")
}
// Execute implements subcommands.Command.Execute.
func (c *Symbolize) Execute(_ context.Context, f *flag.FlagSet, args ...interface{}) subcommands.ExitStatus {
if f.NArg() != 0 {
f.Usage()
return subcommands.ExitUsageError
}
if !coverage.KcovAvailable() {
return Errorf("symbolize can only be used when coverage is available.")
}
coverage.InitCoverageData()
if c.dumpAll {
coverage.WriteAllBlocks(os.Stdout)
return subcommands.ExitSuccess
}
scanner := bufio.NewScanner(os.Stdin)
for scanner.Scan() {
// Input is always base 16, but may or may not have a leading "0x".
str := strings.TrimPrefix(scanner.Text(), "0x")
pc, err := strconv.ParseUint(str, 16 /* base */, 64 /* bitSize */)
if err != nil {
return Errorf("Failed to symbolize \"%s\": %v", scanner.Text(), err)
}
if err := coverage.Symbolize(os.Stdout, pc); err != nil {
return Errorf("Failed to symbolize \"%s\": %v", scanner.Text(), err)
}
}
return subcommands.ExitSuccess
}
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