diff options
Diffstat (limited to 'runsc')
| -rw-r--r-- | runsc/cli/main.go | 1 | ||||
| -rw-r--r-- | runsc/cmd/BUILD | 2 | ||||
| -rw-r--r-- | runsc/cmd/symbolize.go | 91 |
3 files changed, 94 insertions, 0 deletions
diff --git a/runsc/cli/main.go b/runsc/cli/main.go index cc3752e8d..6c3bf4d21 100644 --- a/runsc/cli/main.go +++ b/runsc/cli/main.go @@ -83,6 +83,7 @@ func Main(version string) { subcommands.Register(new(cmd.Spec), "") subcommands.Register(new(cmd.State), "") subcommands.Register(new(cmd.Start), "") + subcommands.Register(new(cmd.Symbolize), "") subcommands.Register(new(cmd.Wait), "") // Register internal commands with the internal group name. This causes diff --git a/runsc/cmd/BUILD b/runsc/cmd/BUILD index 2556f6d9e..19520d7ab 100644 --- a/runsc/cmd/BUILD +++ b/runsc/cmd/BUILD @@ -32,6 +32,7 @@ go_library( "start.go", "state.go", "statefile.go", + "symbolize.go", "syscalls.go", "wait.go", ], @@ -39,6 +40,7 @@ go_library( "//runsc:__subpackages__", ], deps = [ + "//pkg/coverage", "//pkg/log", "//pkg/p9", "//pkg/sentry/control", diff --git a/runsc/cmd/symbolize.go b/runsc/cmd/symbolize.go new file mode 100644 index 000000000..fc0c69358 --- /dev/null +++ b/runsc/cmd/symbolize.go @@ -0,0 +1,91 @@ +// 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 +} |