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| // Copyright 2014 Google Inc. All Rights Reserved. | ||
| // | ||
| // 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. | ||
|
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| package binutils | ||
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| import ( | ||
| "bufio" | ||
| "fmt" | ||
| "io" | ||
| "os/exec" | ||
| "regexp" | ||
| "strconv" | ||
| "strings" | ||
| "sync" | ||
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| "github.com/google/pprof/internal/plugin" | ||
| ) | ||
|
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| const ( | ||
| defaultLLVMGsymUtil = "llvm-gsymutil" | ||
| ) | ||
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| // llvmGsymUtil is a connection to an llvm-symbolizer command for | ||
| // obtaining address and line number information from a binary. | ||
| type llvmGsymUtil struct { | ||
| sync.Mutex | ||
| filename string | ||
| rw lineReaderWriter | ||
| base uint64 | ||
| } | ||
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| type llvmGsymUtilJob struct { | ||
| cmd *exec.Cmd | ||
| in io.WriteCloser | ||
| out *bufio.Reader | ||
| } | ||
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| func (a *llvmGsymUtilJob) write(s string) error { | ||
| _, err := fmt.Fprintln(a.in, s) | ||
| return err | ||
| } | ||
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| func (a *llvmGsymUtilJob) readLine() (string, error) { | ||
| s, err := a.out.ReadString('\n') | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
| return strings.TrimSpace(s), nil | ||
| } | ||
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| // close releases any resources used by the llvmGsymUtil object. | ||
| func (a *llvmGsymUtilJob) close() { | ||
| a.in.Close() | ||
| a.cmd.Wait() | ||
| } | ||
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| // newLLVMGsymUtil starts the given llvmGsymUtil command reporting | ||
| // information about the given executable file. If file is a shared | ||
| // library, base should be the address at which it was mapped in the | ||
| // program under consideration. | ||
| func newLLVMGsymUtil(cmd, file string, base uint64, isData bool) (*llvmGsymUtil, error) { | ||
| if cmd == "" { | ||
| cmd = defaultLLVMGsymUtil | ||
| } | ||
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| j := &llvmGsymUtilJob{ | ||
| cmd: exec.Command(cmd, "--addresses-from-stdin"), | ||
| } | ||
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| var err error | ||
| if j.in, err = j.cmd.StdinPipe(); err != nil { | ||
| return nil, err | ||
| } | ||
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| outPipe, err := j.cmd.StdoutPipe() | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
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| j.out = bufio.NewReader(outPipe) | ||
| if err := j.cmd.Start(); err != nil { | ||
| return nil, err | ||
| } | ||
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| a := &llvmGsymUtil{ | ||
| filename: file, | ||
| rw: j, | ||
| base: base, | ||
| } | ||
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| return a, nil | ||
| } | ||
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| // readFrame parses the llvm-symbolizer output for a single address. It | ||
| // returns a populated plugin.Frame and whether it has reached the end of the | ||
| // data. | ||
| func (d *llvmGsymUtil) readFrame() (plugin.Frame, bool) { | ||
| line, err := d.rw.readLine() | ||
| if err != nil || len(line) == 0 { | ||
| return plugin.Frame{}, true | ||
| } | ||
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| print("read line: " + line + "\n") | ||
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| // TODO compile regexes once | ||
| prefixRegex := regexp.MustCompile(`^(0x[[:xdigit:]]+:\s|\s+)`) | ||
| // _ZNK2sf12RefCountBaseILb0EE9removeRefEv + 3 @ /home/sgiesecke/Snowflake/trunk/ExecPlatform/build/ReleaseClangLTO/../../src/core/ptr/RefCountBase.hpp:67 [inlined] | ||
| frameRegex := regexp.MustCompile(`(\S+).* @ (.*):([[:digit:]]+)`) | ||
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| // The first frame contains an address: prefix. We don't need that. The remaining frames start with spaces. | ||
| suffix := prefixRegex.ReplaceAllString(line, "") | ||
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| print("suffix is: " + suffix + "\n") | ||
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| if strings.HasPrefix(suffix, "error:") { | ||
| // Skip empty line that follows. | ||
| _, _ = d.rw.readLine() | ||
| return plugin.Frame{}, true | ||
| } | ||
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| frameMatch := frameRegex.FindStringSubmatch(suffix) | ||
| if frameMatch == nil { | ||
| print("frame regex didn't match\n") | ||
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| return plugin.Frame{}, true | ||
| } | ||
|
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| // TODO handle cases where no source file/line is available | ||
| // TODO handle column number? | ||
|
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| funcname := frameMatch[1] | ||
| sourceFile := frameMatch[2] | ||
| sourceLineStr := frameMatch[3] | ||
|
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| sourceLine := 0 | ||
| if line, err := strconv.Atoi(sourceLineStr); err == nil { | ||
| sourceLine = line | ||
| } | ||
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| return plugin.Frame{Func: funcname, File: sourceFile, Line: sourceLine}, false | ||
| } | ||
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| // addrInfo returns the stack frame information for a specific program | ||
| // address. It returns nil if the address could not be identified. | ||
| func (d *llvmGsymUtil) addrInfo(addr uint64) ([]plugin.Frame, error) { | ||
| d.Lock() | ||
| defer d.Unlock() | ||
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| print("querying gsym: " + fmt.Sprintf("0x%x %s.gsym", addr-d.base, d.filename) + "\n") | ||
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| if err := d.rw.write(fmt.Sprintf("0x%x %s.gsym", addr-d.base, d.filename)); err != nil { | ||
| return nil, err | ||
| } | ||
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| var stack []plugin.Frame | ||
| for { | ||
| frame, end := d.readFrame() | ||
| if end { | ||
| break | ||
| } | ||
|
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| if frame != (plugin.Frame{}) { | ||
| stack = append(stack, frame) | ||
| } | ||
| } | ||
|
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| return stack, nil | ||
| } |
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