b9846c7684
This patch aims to improve how Delve tracks the current goroutine, especially in very highly parallel programs. The main spirit of this patch is to ensure that even in situations where the goroutine we care about is not executing (common for len(g) > len(m)) we still end up back on that goroutine as a result of executing the 'next' command. We accomplish this by tracking our original goroutine id, and any time a breakpoint is hit or a threads stops, we examine the stopped threads and see if any are executing the goroutine we care about. If not, we set 'next' breakpoint for them again and continue them. This is done so that one of those threads can eventually pick up the goroutine we care about and begin executing it again.
741 lines
18 KiB
Go
741 lines
18 KiB
Go
package proc
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import (
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"bytes"
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"fmt"
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"net"
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"net/http"
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"os"
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"path/filepath"
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"runtime"
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"strings"
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"testing"
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"time"
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protest "github.com/derekparker/delve/proc/test"
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)
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func init() {
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runtime.GOMAXPROCS(4)
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os.Setenv("GOMAXPROCS", "4")
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}
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func TestMain(m *testing.M) {
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os.Exit(protest.RunTestsWithFixtures(m))
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}
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func withTestProcess(name string, t *testing.T, fn func(p *Process, fixture protest.Fixture)) {
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fixture := protest.BuildFixture(name)
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p, err := Launch([]string{fixture.Path})
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if err != nil {
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t.Fatal("Launch():", err)
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}
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defer func() {
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p.Halt()
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p.Kill()
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}()
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fn(p, fixture)
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}
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func getRegisters(p *Process, t *testing.T) Registers {
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regs, err := p.Registers()
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if err != nil {
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t.Fatal("Registers():", err)
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}
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return regs
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}
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func dataAtAddr(thread *Thread, addr uint64) ([]byte, error) {
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return thread.readMemory(uintptr(addr), 1)
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}
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func assertNoError(err error, t *testing.T, s string) {
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if err != nil {
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_, file, line, _ := runtime.Caller(1)
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fname := filepath.Base(file)
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t.Fatalf("failed assertion at %s:%d: %s - %s\n", fname, line, s, err)
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}
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}
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func currentPC(p *Process, t *testing.T) uint64 {
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pc, err := p.PC()
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if err != nil {
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t.Fatal(err)
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}
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return pc
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}
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func currentLineNumber(p *Process, t *testing.T) (string, int) {
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pc := currentPC(p, t)
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f, l, _ := p.goSymTable.PCToLine(pc)
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return f, l
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}
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func TestExit(t *testing.T) {
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withTestProcess("continuetestprog", t, func(p *Process, fixture protest.Fixture) {
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err := p.Continue()
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pe, ok := err.(ProcessExitedError)
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if !ok {
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t.Fatalf("Continue() returned unexpected error type %s", err)
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}
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if pe.Status != 0 {
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t.Errorf("Unexpected error status: %d", pe.Status)
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}
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if pe.Pid != p.Pid {
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t.Errorf("Unexpected process id: %d", pe.Pid)
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}
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})
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}
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func setFunctionBreakpoint(p *Process, fname string) (*Breakpoint, error) {
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addr, err := p.FindFunctionLocation(fname, true, 0)
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if err != nil {
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return nil, err
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}
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return p.SetBreakpoint(addr)
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}
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func TestHalt(t *testing.T) {
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stopChan := make(chan interface{})
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withTestProcess("loopprog", t, func(p *Process, fixture protest.Fixture) {
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_, err := setFunctionBreakpoint(p, "main.loop")
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assertNoError(err, t, "SetBreakpoint")
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assertNoError(p.Continue(), t, "Continue")
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for _, th := range p.Threads {
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if th.running != false {
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t.Fatal("expected running = false for thread", th.Id)
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}
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_, err := th.Registers()
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assertNoError(err, t, "Registers")
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}
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go func() {
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for {
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if p.Running() {
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if err := p.RequestManualStop(); err != nil {
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t.Fatal(err)
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}
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stopChan <- nil
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return
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}
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}
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}()
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assertNoError(p.Continue(), t, "Continue")
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<-stopChan
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// Loop through threads and make sure they are all
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// actually stopped, err will not be nil if the process
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// is still running.
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for _, th := range p.Threads {
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if !th.Stopped() {
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t.Fatal("expected thread to be stopped, but was not")
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}
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if th.running != false {
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t.Fatal("expected running = false for thread", th.Id)
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}
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_, err := th.Registers()
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assertNoError(err, t, "Registers")
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}
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})
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}
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func TestStep(t *testing.T) {
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withTestProcess("testprog", t, func(p *Process, fixture protest.Fixture) {
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helloworldfunc := p.goSymTable.LookupFunc("main.helloworld")
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helloworldaddr := helloworldfunc.Entry
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_, err := p.SetBreakpoint(helloworldaddr)
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assertNoError(err, t, "SetBreakpoint()")
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assertNoError(p.Continue(), t, "Continue()")
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regs := getRegisters(p, t)
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rip := regs.PC()
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err = p.Step()
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assertNoError(err, t, "Step()")
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regs = getRegisters(p, t)
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if rip >= regs.PC() {
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t.Errorf("Expected %#v to be greater than %#v", regs.PC(), rip)
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}
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})
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}
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func TestBreakpoint(t *testing.T) {
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withTestProcess("testprog", t, func(p *Process, fixture protest.Fixture) {
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helloworldfunc := p.goSymTable.LookupFunc("main.helloworld")
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helloworldaddr := helloworldfunc.Entry
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bp, err := p.SetBreakpoint(helloworldaddr)
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assertNoError(err, t, "SetBreakpoint()")
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assertNoError(p.Continue(), t, "Continue()")
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pc, err := p.PC()
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if err != nil {
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t.Fatal(err)
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}
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if pc-1 != bp.Addr && pc != bp.Addr {
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f, l, _ := p.goSymTable.PCToLine(pc)
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t.Fatalf("Break not respected:\nPC:%#v %s:%d\nFN:%#v \n", pc, f, l, bp.Addr)
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}
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})
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}
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func TestBreakpointInSeperateGoRoutine(t *testing.T) {
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withTestProcess("testthreads", t, func(p *Process, fixture protest.Fixture) {
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fn := p.goSymTable.LookupFunc("main.anotherthread")
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if fn == nil {
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t.Fatal("No fn exists")
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}
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_, err := p.SetBreakpoint(fn.Entry)
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if err != nil {
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t.Fatal(err)
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}
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err = p.Continue()
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if err != nil {
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t.Fatal(err)
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}
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pc, err := p.PC()
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if err != nil {
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t.Fatal(err)
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}
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f, l, _ := p.goSymTable.PCToLine(pc)
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if f != "testthreads.go" && l != 8 {
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t.Fatal("Program did not hit breakpoint")
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}
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})
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}
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func TestBreakpointWithNonExistantFunction(t *testing.T) {
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withTestProcess("testprog", t, func(p *Process, fixture protest.Fixture) {
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_, err := p.SetBreakpoint(0)
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if err == nil {
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t.Fatal("Should not be able to break at non existant function")
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}
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})
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}
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func TestClearBreakpointBreakpoint(t *testing.T) {
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withTestProcess("testprog", t, func(p *Process, fixture protest.Fixture) {
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fn := p.goSymTable.LookupFunc("main.sleepytime")
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bp, err := p.SetBreakpoint(fn.Entry)
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assertNoError(err, t, "SetBreakpoint()")
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bp, err = p.ClearBreakpoint(fn.Entry)
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assertNoError(err, t, "ClearBreakpoint()")
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data, err := dataAtAddr(p.CurrentThread, bp.Addr)
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if err != nil {
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t.Fatal(err)
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}
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int3 := []byte{0xcc}
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if bytes.Equal(data, int3) {
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t.Fatalf("Breakpoint was not cleared data: %#v, int3: %#v", data, int3)
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}
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if len(p.Breakpoints) != 0 {
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t.Fatal("Breakpoint not removed internally")
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}
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})
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}
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type nextTest struct {
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begin, end int
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}
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func testnext(program string, testcases []nextTest, initialLocation string, t *testing.T) {
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withTestProcess(program, t, func(p *Process, fixture protest.Fixture) {
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bp, err := setFunctionBreakpoint(p, initialLocation)
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assertNoError(err, t, "SetBreakpoint()")
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assertNoError(p.Continue(), t, "Continue()")
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p.ClearBreakpoint(bp.Addr)
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p.CurrentThread.SetPC(bp.Addr)
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f, ln := currentLineNumber(p, t)
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for _, tc := range testcases {
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if ln != tc.begin {
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t.Fatalf("Program not stopped at correct spot expected %d was %s:%d", tc.begin, filepath.Base(f), ln)
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}
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assertNoError(p.Next(), t, "Next() returned an error")
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f, ln = currentLineNumber(p, t)
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if ln != tc.end {
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t.Fatalf("Program did not continue to correct next location expected %d was %s:%d", tc.end, filepath.Base(f), ln)
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}
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}
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if len(p.Breakpoints) != 0 {
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t.Fatal("Not all breakpoints were cleaned up", len(p.Breakpoints))
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}
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})
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}
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func TestNextGeneral(t *testing.T) {
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testcases := []nextTest{
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{19, 20},
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{20, 23},
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{23, 24},
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{24, 26},
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{26, 31},
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{31, 23},
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{23, 24},
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{24, 26},
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{26, 31},
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{31, 23},
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{23, 24},
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{24, 26},
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{26, 27},
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{27, 34},
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}
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testnext("testnextprog", testcases, "main.testnext", t)
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}
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func TestNextConcurrent(t *testing.T) {
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testcases := []nextTest{
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{9, 10},
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{10, 11},
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}
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withTestProcess("parallel_next", t, func(p *Process, fixture protest.Fixture) {
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_, err := setFunctionBreakpoint(p, "main.sayhi")
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assertNoError(err, t, "SetBreakpoint")
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assertNoError(p.Continue(), t, "Continue")
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f, ln := currentLineNumber(p, t)
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initV, err := p.EvalVariable("n")
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assertNoError(err, t, "EvalVariable")
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for _, tc := range testcases {
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if ln != tc.begin {
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t.Fatalf("Program not stopped at correct spot expected %d was %s:%d", tc.begin, filepath.Base(f), ln)
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}
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assertNoError(p.Next(), t, "Next() returned an error")
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f, ln = currentLineNumber(p, t)
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if ln != tc.end {
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t.Fatalf("Program did not continue to correct next location expected %d was %s:%d", tc.end, filepath.Base(f), ln)
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}
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v, err := p.EvalVariable("n")
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assertNoError(err, t, "EvalVariable")
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if v.Value != initV.Value {
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t.Fatal("Did not end up on same goroutine")
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}
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}
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})
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}
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func TestNextGoroutine(t *testing.T) {
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testcases := []nextTest{
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{47, 42},
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}
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testnext("testnextprog", testcases, "main.testgoroutine", t)
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}
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func TestNextFunctionReturn(t *testing.T) {
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testcases := []nextTest{
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{14, 35},
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}
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testnext("testnextprog", testcases, "main.helloworld", t)
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}
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func TestNextFunctionReturnDefer(t *testing.T) {
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testcases := []nextTest{
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{9, 6},
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{6, 7},
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{7, 10},
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}
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testnext("testnextdefer", testcases, "main.main", t)
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}
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func TestNextNetHTTP(t *testing.T) {
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testcases := []nextTest{
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{11, 12},
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{12, 13},
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}
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withTestProcess("testnextnethttp", t, func(p *Process, fixture protest.Fixture) {
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go func() {
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for !p.Running() {
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time.Sleep(50 * time.Millisecond)
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}
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// Wait for program to start listening.
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for {
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conn, err := net.Dial("tcp", ":9191")
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if err == nil {
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conn.Close()
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break
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}
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time.Sleep(50 * time.Millisecond)
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}
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http.Get("http://localhost:9191")
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}()
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if err := p.Continue(); err != nil {
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t.Fatal(err)
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}
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f, ln := currentLineNumber(p, t)
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for _, tc := range testcases {
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if ln != tc.begin {
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t.Fatalf("Program not stopped at correct spot expected %d was %s:%d", tc.begin, filepath.Base(f), ln)
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}
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assertNoError(p.Next(), t, "Next() returned an error")
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f, ln = currentLineNumber(p, t)
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if ln != tc.end {
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t.Fatalf("Program did not continue to correct next location expected %d was %s:%d", tc.end, filepath.Base(f), ln)
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}
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}
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})
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}
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func TestRuntimeBreakpoint(t *testing.T) {
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withTestProcess("testruntimebreakpoint", t, func(p *Process, fixture protest.Fixture) {
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err := p.Continue()
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if err != nil {
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t.Fatal(err)
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}
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pc, err := p.PC()
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if err != nil {
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t.Fatal(err)
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}
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_, l, _ := p.PCToLine(pc)
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if l != 10 {
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t.Fatal("did not respect breakpoint")
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}
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})
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}
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func TestFindReturnAddress(t *testing.T) {
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withTestProcess("testnextprog", t, func(p *Process, fixture protest.Fixture) {
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start, _, err := p.goSymTable.LineToPC(fixture.Source, 24)
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if err != nil {
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t.Fatal(err)
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}
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_, err = p.SetBreakpoint(start)
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if err != nil {
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t.Fatal(err)
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}
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err = p.Continue()
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if err != nil {
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t.Fatal(err)
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}
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addr, err := p.CurrentThread.ReturnAddress()
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if err != nil {
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t.Fatal(err)
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}
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_, l, _ := p.goSymTable.PCToLine(addr)
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if l != 40 {
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t.Fatalf("return address not found correctly, expected line 40")
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}
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})
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}
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|
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func TestFindReturnAddressTopOfStackFn(t *testing.T) {
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withTestProcess("testreturnaddress", t, func(p *Process, fixture protest.Fixture) {
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fnName := "runtime.rt0_go"
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fn := p.goSymTable.LookupFunc(fnName)
|
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if fn == nil {
|
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t.Fatalf("could not find function %s", fnName)
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}
|
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if _, err := p.SetBreakpoint(fn.Entry); err != nil {
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t.Fatal(err)
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}
|
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if err := p.Continue(); err != nil {
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t.Fatal(err)
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}
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if _, err := p.CurrentThread.ReturnAddress(); err == nil {
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t.Fatal("expected error to be returned")
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}
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})
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}
|
|
|
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func TestSwitchThread(t *testing.T) {
|
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withTestProcess("testnextprog", t, func(p *Process, fixture protest.Fixture) {
|
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// With invalid thread id
|
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err := p.SwitchThread(-1)
|
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if err == nil {
|
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t.Fatal("Expected error for invalid thread id")
|
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}
|
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pc, err := p.FindFunctionLocation("main.main", true, 0)
|
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if err != nil {
|
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t.Fatal(err)
|
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}
|
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_, err = p.SetBreakpoint(pc)
|
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if err != nil {
|
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t.Fatal(err)
|
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}
|
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err = p.Continue()
|
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if err != nil {
|
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t.Fatal(err)
|
|
}
|
|
var nt int
|
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ct := p.CurrentThread.Id
|
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for tid := range p.Threads {
|
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if tid != ct {
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nt = tid
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break
|
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}
|
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}
|
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if nt == 0 {
|
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t.Fatal("could not find thread to switch to")
|
|
}
|
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// With valid thread id
|
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err = p.SwitchThread(nt)
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if err != nil {
|
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t.Fatal(err)
|
|
}
|
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if p.CurrentThread.Id != nt {
|
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t.Fatal("Did not switch threads")
|
|
}
|
|
})
|
|
}
|
|
|
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type loc struct {
|
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line int
|
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fn string
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|
}
|
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|
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func (l1 *loc) match(l2 Location) bool {
|
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if l1.line >= 0 {
|
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if l1.line != l2.Line-1 {
|
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return false
|
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}
|
|
}
|
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|
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return l1.fn == l2.Fn.Name
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}
|
|
|
|
func TestStacktrace(t *testing.T) {
|
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stacks := [][]loc{
|
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[]loc{{3, "main.stacktraceme"}, {8, "main.func1"}, {16, "main.main"}},
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[]loc{{3, "main.stacktraceme"}, {8, "main.func1"}, {12, "main.func2"}, {17, "main.main"}},
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}
|
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withTestProcess("stacktraceprog", t, func(p *Process, fixture protest.Fixture) {
|
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bp, err := setFunctionBreakpoint(p, "main.stacktraceme")
|
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assertNoError(err, t, "BreakByLocation()")
|
|
|
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for i := range stacks {
|
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assertNoError(p.Continue(), t, "Continue()")
|
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locations, err := p.CurrentThread.Stacktrace(40)
|
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assertNoError(err, t, "Stacktrace()")
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|
|
if len(locations) != len(stacks[i])+2 {
|
|
t.Fatalf("Wrong stack trace size %d %d\n", len(locations), len(stacks[i])+2)
|
|
}
|
|
|
|
for j := range stacks[i] {
|
|
if !stacks[i][j].match(locations[j]) {
|
|
t.Fatalf("Wrong stack trace pos %d\n", j)
|
|
}
|
|
}
|
|
}
|
|
|
|
p.ClearBreakpoint(bp.Addr)
|
|
p.Continue()
|
|
})
|
|
}
|
|
|
|
func stackMatch(stack []loc, locations []Location) bool {
|
|
if len(stack) > len(locations) {
|
|
return false
|
|
}
|
|
for i := range stack {
|
|
if !stack[i].match(locations[i]) {
|
|
return false
|
|
}
|
|
}
|
|
return true
|
|
}
|
|
|
|
func TestStacktraceGoroutine(t *testing.T) {
|
|
mainStack := []loc{{11, "main.stacktraceme"}, {21, "main.main"}}
|
|
agoroutineStack := []loc{{-1, "runtime.gopark"}, {-1, "runtime.goparkunlock"}, {-1, "runtime.chansend"}, {-1, "runtime.chansend1"}, {8, "main.agoroutine"}}
|
|
|
|
withTestProcess("goroutinestackprog", t, func(p *Process, fixture protest.Fixture) {
|
|
bp, err := setFunctionBreakpoint(p, "main.stacktraceme")
|
|
assertNoError(err, t, "BreakByLocation()")
|
|
|
|
assertNoError(p.Continue(), t, "Continue()")
|
|
|
|
gs, err := p.GoroutinesInfo()
|
|
assertNoError(err, t, "GoroutinesInfo")
|
|
|
|
agoroutineCount := 0
|
|
mainCount := 0
|
|
|
|
for i, g := range gs {
|
|
locations, err := p.GoroutineStacktrace(g, 40)
|
|
assertNoError(err, t, "GoroutineStacktrace()")
|
|
|
|
if stackMatch(mainStack, locations) {
|
|
mainCount++
|
|
}
|
|
|
|
if stackMatch(agoroutineStack, locations) {
|
|
agoroutineCount++
|
|
} else {
|
|
t.Logf("Non-goroutine stack: %d (%d)", i, len(locations))
|
|
for i := range locations {
|
|
name := ""
|
|
if locations[i].Fn != nil {
|
|
name = locations[i].Fn.Name
|
|
}
|
|
t.Logf("\t%s:%d %s\n", locations[i].File, locations[i].Line, name)
|
|
}
|
|
}
|
|
}
|
|
|
|
if mainCount != 1 {
|
|
t.Fatalf("Main goroutine stack not found")
|
|
}
|
|
|
|
if agoroutineCount != 10 {
|
|
t.Fatalf("Goroutine stacks not found (%d)", agoroutineCount)
|
|
}
|
|
|
|
p.ClearBreakpoint(bp.Addr)
|
|
p.Continue()
|
|
})
|
|
}
|
|
|
|
func TestKill(t *testing.T) {
|
|
withTestProcess("testprog", t, func(p *Process, fixture protest.Fixture) {
|
|
if err := p.Kill(); err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
if p.Exited() != true {
|
|
t.Fatal("expected process to have exited")
|
|
}
|
|
if runtime.GOOS == "linux" {
|
|
_, err := os.Open(fmt.Sprintf("/proc/%d/", p.Pid))
|
|
if err == nil {
|
|
t.Fatal("process has not exited", p.Pid)
|
|
}
|
|
}
|
|
})
|
|
}
|
|
|
|
func testGSupportFunc(name string, t *testing.T, p *Process, fixture protest.Fixture) {
|
|
bp, err := setFunctionBreakpoint(p, "main.main")
|
|
assertNoError(err, t, name+": BreakByLocation()")
|
|
|
|
assertNoError(p.Continue(), t, name+": Continue()")
|
|
|
|
g, err := p.CurrentThread.GetG()
|
|
assertNoError(err, t, name+": GetG()")
|
|
|
|
if g == nil {
|
|
t.Fatal(name + ": g was nil")
|
|
}
|
|
|
|
t.Logf(name+": g is: %v", g)
|
|
|
|
p.ClearBreakpoint(bp.Addr)
|
|
}
|
|
|
|
func TestGetG(t *testing.T) {
|
|
withTestProcess("testprog", t, func(p *Process, fixture protest.Fixture) {
|
|
testGSupportFunc("nocgo", t, p, fixture)
|
|
})
|
|
|
|
// On OSX with Go < 1.5 CGO is not supported due to: https://github.com/golang/go/issues/8973
|
|
if runtime.GOOS == "darwin" && strings.Contains(runtime.Version(), "1.4") {
|
|
return
|
|
}
|
|
|
|
withTestProcess("cgotest", t, func(p *Process, fixture protest.Fixture) {
|
|
testGSupportFunc("cgo", t, p, fixture)
|
|
})
|
|
}
|
|
|
|
func TestContinueMulti(t *testing.T) {
|
|
withTestProcess("integrationprog", t, func(p *Process, fixture protest.Fixture) {
|
|
bp1, err := setFunctionBreakpoint(p, "main.main")
|
|
assertNoError(err, t, "BreakByLocation()")
|
|
|
|
bp2, err := setFunctionBreakpoint(p, "main.sayhi")
|
|
assertNoError(err, t, "BreakByLocation()")
|
|
|
|
mainCount := 0
|
|
sayhiCount := 0
|
|
for {
|
|
err := p.Continue()
|
|
if p.exited {
|
|
break
|
|
}
|
|
assertNoError(err, t, "Continue()")
|
|
|
|
if p.CurrentBreakpoint().ID == bp1.ID {
|
|
mainCount++
|
|
}
|
|
|
|
if p.CurrentBreakpoint().ID == bp2.ID {
|
|
sayhiCount++
|
|
}
|
|
}
|
|
|
|
if mainCount != 1 {
|
|
t.Fatalf("Main breakpoint hit wrong number of times: %d\n", mainCount)
|
|
}
|
|
|
|
if sayhiCount != 3 {
|
|
t.Fatalf("Sayhi breakpoint hit wrong number of times: %d\n", sayhiCount)
|
|
}
|
|
})
|
|
}
|
|
|
|
func versionAfterOrEqual(t *testing.T, verStr string, ver GoVersion) {
|
|
pver, ok := parseVersionString(verStr)
|
|
if !ok {
|
|
t.Fatalf("Could not parse version string <%s>", verStr)
|
|
}
|
|
if !pver.AfterOrEqual(ver) {
|
|
t.Fatalf("Version <%s> parsed as %v not after %v", verStr, pver, ver)
|
|
}
|
|
t.Logf("version string <%s> → %v", verStr, ver)
|
|
}
|
|
|
|
func TestParseVersionString(t *testing.T) {
|
|
versionAfterOrEqual(t, "go1.4", GoVersion{1, 4, 0, 0, 0})
|
|
versionAfterOrEqual(t, "go1.5.0", GoVersion{1, 5, 0, 0, 0})
|
|
versionAfterOrEqual(t, "go1.4.2", GoVersion{1, 4, 2, 0, 0})
|
|
versionAfterOrEqual(t, "go1.5beta2", GoVersion{1, 5, -1, 2, 0})
|
|
versionAfterOrEqual(t, "go1.5rc2", GoVersion{1, 5, -1, 0, 2})
|
|
ver, ok := parseVersionString("devel +17efbfc Tue Jul 28 17:39:19 2015 +0000 linux/amd64")
|
|
if !ok {
|
|
t.Fatalf("Could not parse devel version string")
|
|
}
|
|
if !ver.IsDevel() {
|
|
t.Fatalf("Devel version string not correctly recognized")
|
|
}
|
|
}
|
|
|
|
func TestBreakpointOnFunctionEntry(t *testing.T) {
|
|
withTestProcess("testprog", t, func(p *Process, fixture protest.Fixture) {
|
|
addr, err := p.FindFunctionLocation("main.main", false, 0)
|
|
assertNoError(err, t, "FindFunctionLocation()")
|
|
_, err = p.SetBreakpoint(addr)
|
|
assertNoError(err, t, "SetBreakpoint()")
|
|
assertNoError(p.Continue(), t, "Continue()")
|
|
_, ln := currentLineNumber(p, t)
|
|
if ln != 17 {
|
|
t.Fatalf("Wrong line number: %d (expected: 17)\n", ln)
|
|
}
|
|
})
|
|
}
|
|
|
|
func TestProcessReceivesSIGCHLD(t *testing.T) {
|
|
withTestProcess("sigchldprog", t, func(p *Process, fixture protest.Fixture) {
|
|
err := p.Continue()
|
|
_, ok := err.(ProcessExitedError)
|
|
if !ok {
|
|
t.Fatalf("Continue() returned unexpected error type %s", err)
|
|
}
|
|
})
|
|
}
|