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-rw-r--r--libgo/go/exp/ogle/abort.go35
-rw-r--r--libgo/go/exp/ogle/arch.go125
-rw-r--r--libgo/go/exp/ogle/cmd.go372
-rw-r--r--libgo/go/exp/ogle/event.go280
-rw-r--r--libgo/go/exp/ogle/frame.go212
-rw-r--r--libgo/go/exp/ogle/goroutine.go117
-rw-r--r--libgo/go/exp/ogle/main.go9
-rw-r--r--libgo/go/exp/ogle/process.go521
-rw-r--r--libgo/go/exp/ogle/rruntime.go271
-rw-r--r--libgo/go/exp/ogle/rtype.go291
-rw-r--r--libgo/go/exp/ogle/rvalue.go515
-rw-r--r--libgo/go/exp/ogle/vars.go272
12 files changed, 3020 insertions, 0 deletions
diff --git a/libgo/go/exp/ogle/abort.go b/libgo/go/exp/ogle/abort.go
new file mode 100644
index 0000000..311a7b3
--- /dev/null
+++ b/libgo/go/exp/ogle/abort.go
@@ -0,0 +1,35 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package ogle
+
+import (
+ "os"
+ "runtime"
+)
+
+// An aborter aborts the thread's current computation, usually
+// passing the error to a waiting thread.
+type aborter interface {
+ Abort(err os.Error)
+}
+
+type ogleAborter chan os.Error
+
+func (a ogleAborter) Abort(err os.Error) {
+ a <- err
+ runtime.Goexit()
+}
+
+// try executes a computation; if the computation Aborts, try returns
+// the error passed to abort.
+func try(f func(a aborter)) os.Error {
+ a := make(ogleAborter)
+ go func() {
+ f(a)
+ a <- nil
+ }()
+ err := <-a
+ return err
+}
diff --git a/libgo/go/exp/ogle/arch.go b/libgo/go/exp/ogle/arch.go
new file mode 100644
index 0000000..52b1c97
--- /dev/null
+++ b/libgo/go/exp/ogle/arch.go
@@ -0,0 +1,125 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package ogle
+
+import (
+ "debug/proc"
+ "math"
+)
+
+type Arch interface {
+ // ToWord converts an array of up to 8 bytes in memory order
+ // to a word.
+ ToWord(data []byte) proc.Word
+ // FromWord converts a word to an array of up to 8 bytes in
+ // memory order.
+ FromWord(v proc.Word, out []byte)
+ // ToFloat32 converts a word to a float. The order of this
+ // word will be the order returned by ToWord on the memory
+ // representation of a float, and thus may require reversing.
+ ToFloat32(bits uint32) float32
+ // FromFloat32 converts a float to a word. This should return
+ // a word that can be passed to FromWord to get the memory
+ // representation of a float on this architecture.
+ FromFloat32(f float32) uint32
+ // ToFloat64 is to float64 as ToFloat32 is to float32.
+ ToFloat64(bits uint64) float64
+ // FromFloat64 is to float64 as FromFloat32 is to float32.
+ FromFloat64(f float64) uint64
+
+ // IntSize returns the number of bytes in an 'int'.
+ IntSize() int
+ // PtrSize returns the number of bytes in a 'uintptr'.
+ PtrSize() int
+ // FloatSize returns the number of bytes in a 'float'.
+ FloatSize() int
+ // Align rounds offset up to the appropriate offset for a
+ // basic type with the given width.
+ Align(offset, width int) int
+
+ // G returns the current G pointer.
+ G(regs proc.Regs) proc.Word
+
+ // ClosureSize returns the number of bytes expected by
+ // ParseClosure.
+ ClosureSize() int
+ // ParseClosure takes ClosureSize bytes read from a return PC
+ // in a remote process, determines if the code is a closure,
+ // and returns the frame size of the closure if it is.
+ ParseClosure(data []byte) (frame int, ok bool)
+}
+
+type ArchLSB struct{}
+
+func (ArchLSB) ToWord(data []byte) proc.Word {
+ var v proc.Word
+ for i, b := range data {
+ v |= proc.Word(b) << (uint(i) * 8)
+ }
+ return v
+}
+
+func (ArchLSB) FromWord(v proc.Word, out []byte) {
+ for i := range out {
+ out[i] = byte(v)
+ v >>= 8
+ }
+}
+
+func (ArchLSB) ToFloat32(bits uint32) float32 {
+ // TODO(austin) Do these definitions depend on my current
+ // architecture?
+ return math.Float32frombits(bits)
+}
+
+func (ArchLSB) FromFloat32(f float32) uint32 { return math.Float32bits(f) }
+
+func (ArchLSB) ToFloat64(bits uint64) float64 { return math.Float64frombits(bits) }
+
+func (ArchLSB) FromFloat64(f float64) uint64 { return math.Float64bits(f) }
+
+type ArchAlignedMultiple struct{}
+
+func (ArchAlignedMultiple) Align(offset, width int) int {
+ return ((offset - 1) | (width - 1)) + 1
+}
+
+type amd64 struct {
+ ArchLSB
+ ArchAlignedMultiple
+ gReg int
+}
+
+func (a *amd64) IntSize() int { return 4 }
+
+func (a *amd64) PtrSize() int { return 8 }
+
+func (a *amd64) FloatSize() int { return 4 }
+
+func (a *amd64) G(regs proc.Regs) proc.Word {
+ // See src/pkg/runtime/mkasmh
+ if a.gReg == -1 {
+ ns := regs.Names()
+ for i, n := range ns {
+ if n == "r15" {
+ a.gReg = i
+ break
+ }
+ }
+ }
+
+ return regs.Get(a.gReg)
+}
+
+func (a *amd64) ClosureSize() int { return 8 }
+
+func (a *amd64) ParseClosure(data []byte) (int, bool) {
+ if data[0] == 0x48 && data[1] == 0x81 && data[2] == 0xc4 && data[7] == 0xc3 {
+ return int(a.ToWord(data[3:7]) + 8), true
+ }
+ return 0, false
+}
+
+var Amd64 = &amd64{gReg: -1}
diff --git a/libgo/go/exp/ogle/cmd.go b/libgo/go/exp/ogle/cmd.go
new file mode 100644
index 0000000..d3672c2
--- /dev/null
+++ b/libgo/go/exp/ogle/cmd.go
@@ -0,0 +1,372 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Ogle is the beginning of a debugger for Go.
+package ogle
+
+import (
+ "bufio"
+ "debug/elf"
+ "debug/proc"
+ "exp/eval"
+ "fmt"
+ "go/scanner"
+ "go/token"
+ "os"
+ "strconv"
+ "strings"
+)
+
+var world *eval.World
+var curProc *Process
+
+func Main() {
+ world = eval.NewWorld()
+ defineFuncs()
+ r := bufio.NewReader(os.Stdin)
+ for {
+ print("; ")
+ line, err := r.ReadSlice('\n')
+ if err != nil {
+ break
+ }
+
+ // Try line as a command
+ cmd, rest := getCmd(line)
+ if cmd != nil {
+ err := cmd.handler(rest)
+ if err != nil {
+ scanner.PrintError(os.Stderr, err)
+ }
+ continue
+ }
+
+ // Try line as code
+ code, err := world.Compile(string(line))
+ if err != nil {
+ scanner.PrintError(os.Stderr, err)
+ continue
+ }
+ v, err := code.Run()
+ if err != nil {
+ fmt.Fprintf(os.Stderr, err.String())
+ continue
+ }
+ if v != nil {
+ println(v.String())
+ }
+ }
+}
+
+// newScanner creates a new scanner that scans that given input bytes.
+func newScanner(input []byte) (*scanner.Scanner, *scanner.ErrorVector) {
+ sc := new(scanner.Scanner)
+ ev := new(scanner.ErrorVector)
+ sc.Init("input", input, ev, 0)
+
+ return sc, ev
+}
+
+/*
+ * Commands
+ */
+
+// A UsageError occurs when a command is called with illegal arguments.
+type UsageError string
+
+func (e UsageError) String() string { return string(e) }
+
+// A cmd represents a single command with a handler.
+type cmd struct {
+ cmd string
+ handler func([]byte) os.Error
+}
+
+var cmds = []cmd{
+ {"load", cmdLoad},
+ {"bt", cmdBt},
+}
+
+// getCmd attempts to parse an input line as a registered command. If
+// successful, it returns the command and the bytes remaining after
+// the command, which should be passed to the command.
+func getCmd(line []byte) (*cmd, []byte) {
+ sc, _ := newScanner(line)
+ pos, tok, lit := sc.Scan()
+ if sc.ErrorCount != 0 || tok != token.IDENT {
+ return nil, nil
+ }
+
+ slit := string(lit)
+ for i := range cmds {
+ if cmds[i].cmd == slit {
+ return &cmds[i], line[pos.Offset+len(lit):]
+ }
+ }
+ return nil, nil
+}
+
+// cmdLoad starts or attaches to a process. Its form is similar to
+// import:
+//
+// load [sym] "path" [;]
+//
+// sym specifies the name to give to the process. If not given, the
+// name is derived from the path of the process. If ".", then the
+// packages from the remote process are defined into the current
+// namespace. If given, this symbol is defined as a package
+// containing the process' packages.
+//
+// path gives the path of the process to start or attach to. If it is
+// "pid:<num>", then attach to the given PID. Otherwise, treat it as
+// a file path and space-separated arguments and start a new process.
+//
+// load always sets the current process to the loaded process.
+func cmdLoad(args []byte) os.Error {
+ ident, path, err := parseLoad(args)
+ if err != nil {
+ return err
+ }
+ if curProc != nil {
+ return UsageError("multiple processes not implemented")
+ }
+ if ident != "." {
+ return UsageError("process identifiers not implemented")
+ }
+
+ // Parse argument and start or attach to process
+ var fname string
+ var tproc proc.Process
+ if len(path) >= 4 && path[0:4] == "pid:" {
+ pid, err := strconv.Atoi(path[4:])
+ if err != nil {
+ return err
+ }
+ fname, err = os.Readlink(fmt.Sprintf("/proc/%d/exe", pid))
+ if err != nil {
+ return err
+ }
+ tproc, err = proc.Attach(pid)
+ if err != nil {
+ return err
+ }
+ println("Attached to", pid)
+ } else {
+ parts := strings.Split(path, " ", -1)
+ if len(parts) == 0 {
+ fname = ""
+ } else {
+ fname = parts[0]
+ }
+ tproc, err = proc.ForkExec(fname, parts, os.Environ(), "", []*os.File{os.Stdin, os.Stdout, os.Stderr})
+ if err != nil {
+ return err
+ }
+ println("Started", path)
+ // TODO(austin) If we fail after this point, kill tproc
+ // before detaching.
+ }
+
+ // Get symbols
+ f, err := os.Open(fname, os.O_RDONLY, 0)
+ if err != nil {
+ tproc.Detach()
+ return err
+ }
+ defer f.Close()
+ elf, err := elf.NewFile(f)
+ if err != nil {
+ tproc.Detach()
+ return err
+ }
+ curProc, err = NewProcessElf(tproc, elf)
+ if err != nil {
+ tproc.Detach()
+ return err
+ }
+
+ // Prepare new process
+ curProc.OnGoroutineCreate().AddHandler(EventPrint)
+ curProc.OnGoroutineExit().AddHandler(EventPrint)
+
+ err = curProc.populateWorld(world)
+ if err != nil {
+ tproc.Detach()
+ return err
+ }
+
+ return nil
+}
+
+func parseLoad(args []byte) (ident string, path string, err os.Error) {
+ err = UsageError("Usage: load [sym] \"path\"")
+ sc, ev := newScanner(args)
+
+ var toks [4]token.Token
+ var lits [4][]byte
+ for i := range toks {
+ _, toks[i], lits[i] = sc.Scan()
+ }
+ if sc.ErrorCount != 0 {
+ err = ev.GetError(scanner.NoMultiples)
+ return
+ }
+
+ i := 0
+ switch toks[i] {
+ case token.PERIOD, token.IDENT:
+ ident = string(lits[i])
+ i++
+ }
+
+ if toks[i] != token.STRING {
+ return
+ }
+ path, uerr := strconv.Unquote(string(lits[i]))
+ if uerr != nil {
+ err = uerr
+ return
+ }
+ i++
+
+ if toks[i] == token.SEMICOLON {
+ i++
+ }
+ if toks[i] != token.EOF {
+ return
+ }
+
+ return ident, path, nil
+}
+
+// cmdBt prints a backtrace for the current goroutine. It takes no
+// arguments.
+func cmdBt(args []byte) os.Error {
+ err := parseNoArgs(args, "Usage: bt")
+ if err != nil {
+ return err
+ }
+
+ if curProc == nil || curProc.curGoroutine == nil {
+ return NoCurrentGoroutine{}
+ }
+
+ f := curProc.curGoroutine.frame
+ if f == nil {
+ fmt.Println("No frames on stack")
+ return nil
+ }
+
+ for f.Inner() != nil {
+ f = f.Inner()
+ }
+
+ for i := 0; i < 100; i++ {
+ if f == curProc.curGoroutine.frame {
+ fmt.Printf("=> ")
+ } else {
+ fmt.Printf(" ")
+ }
+ fmt.Printf("%8x %v\n", f.pc, f)
+ f, err = f.Outer()
+ if err != nil {
+ return err
+ }
+ if f == nil {
+ return nil
+ }
+ }
+
+ fmt.Println("...")
+ return nil
+}
+
+func parseNoArgs(args []byte, usage string) os.Error {
+ sc, ev := newScanner(args)
+ _, tok, _ := sc.Scan()
+ if sc.ErrorCount != 0 {
+ return ev.GetError(scanner.NoMultiples)
+ }
+ if tok != token.EOF {
+ return UsageError(usage)
+ }
+ return nil
+}
+
+/*
+ * Functions
+ */
+
+// defineFuncs populates world with the built-in functions.
+func defineFuncs() {
+ t, v := eval.FuncFromNativeTyped(fnOut, fnOutSig)
+ world.DefineConst("Out", t, v)
+ t, v = eval.FuncFromNativeTyped(fnContWait, fnContWaitSig)
+ world.DefineConst("ContWait", t, v)
+ t, v = eval.FuncFromNativeTyped(fnBpSet, fnBpSetSig)
+ world.DefineConst("BpSet", t, v)
+}
+
+// printCurFrame prints the current stack frame, as it would appear in
+// a backtrace.
+func printCurFrame() {
+ if curProc == nil || curProc.curGoroutine == nil {
+ return
+ }
+ f := curProc.curGoroutine.frame
+ if f == nil {
+ return
+ }
+ fmt.Printf("=> %8x %v\n", f.pc, f)
+}
+
+// fnOut moves the current frame to the caller of the current frame.
+func fnOutSig() {}
+func fnOut(t *eval.Thread, args []eval.Value, res []eval.Value) {
+ if curProc == nil {
+ t.Abort(NoCurrentGoroutine{})
+ }
+ err := curProc.Out()
+ if err != nil {
+ t.Abort(err)
+ }
+ // TODO(austin) Only in the command form
+ printCurFrame()
+}
+
+// fnContWait continues the current process and waits for a stopping event.
+func fnContWaitSig() {}
+func fnContWait(t *eval.Thread, args []eval.Value, res []eval.Value) {
+ if curProc == nil {
+ t.Abort(NoCurrentGoroutine{})
+ }
+ err := curProc.ContWait()
+ if err != nil {
+ t.Abort(err)
+ }
+ // TODO(austin) Only in the command form
+ ev := curProc.Event()
+ if ev != nil {
+ fmt.Printf("%v\n", ev)
+ }
+ printCurFrame()
+}
+
+// fnBpSet sets a breakpoint at the entry to the named function.
+func fnBpSetSig(string) {}
+func fnBpSet(t *eval.Thread, args []eval.Value, res []eval.Value) {
+ // TODO(austin) This probably shouldn't take a symbol name.
+ // Perhaps it should take an interface that provides PC's.
+ // Functions and instructions can implement that interface and
+ // we can have something to translate file:line pairs.
+ if curProc == nil {
+ t.Abort(NoCurrentGoroutine{})
+ }
+ name := args[0].(eval.StringValue).Get(t)
+ fn := curProc.syms.LookupFunc(name)
+ if fn == nil {
+ t.Abort(UsageError("no such function " + name))
+ }
+ curProc.OnBreakpoint(proc.Word(fn.Entry)).AddHandler(EventStop)
+}
diff --git a/libgo/go/exp/ogle/event.go b/libgo/go/exp/ogle/event.go
new file mode 100644
index 0000000..d7092de
--- /dev/null
+++ b/libgo/go/exp/ogle/event.go
@@ -0,0 +1,280 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package ogle
+
+import (
+ "debug/proc"
+ "fmt"
+ "os"
+)
+
+/*
+ * Hooks and events
+ */
+
+// An EventHandler is a function that takes an event and returns a
+// response to that event and possibly an error. If an event handler
+// returns an error, the process stops and no other handlers for that
+// event are executed.
+type EventHandler func(e Event) (EventAction, os.Error)
+
+// An EventAction is an event handler's response to an event. If all
+// of an event's handlers execute without returning errors, their
+// results are combined as follows: If any handler returned
+// EAContinue, then the process resumes (without returning from
+// WaitStop); otherwise, if any handler returned EAStop, the process
+// remains stopped; otherwise, if all handlers returned EADefault, the
+// process resumes. A handler may return EARemoveSelf bit-wise or'd
+// with any other action to indicate that the handler should be
+// removed from the hook.
+type EventAction int
+
+const (
+ EARemoveSelf EventAction = 0x100
+ EADefault EventAction = iota
+ EAStop
+ EAContinue
+)
+
+// A EventHook allows event handlers to be added and removed.
+type EventHook interface {
+ AddHandler(EventHandler)
+ RemoveHandler(EventHandler)
+ NumHandler() int
+ handle(e Event) (EventAction, os.Error)
+ String() string
+}
+
+// EventHook is almost, but not quite, suitable for user-defined
+// events. If we want user-defined events, make EventHook a struct,
+// special-case adding and removing handlers in breakpoint hooks, and
+// provide a public interface for posting events to hooks.
+
+type Event interface {
+ Process() *Process
+ Goroutine() *Goroutine
+ String() string
+}
+
+type commonHook struct {
+ // Head of handler chain
+ head *handler
+ // Number of non-internal handlers
+ len int
+}
+
+type handler struct {
+ eh EventHandler
+ // True if this handler must be run before user-defined
+ // handlers in order to ensure correctness.
+ internal bool
+ // True if this handler has been removed from the chain.
+ removed bool
+ next *handler
+}
+
+func (h *commonHook) AddHandler(eh EventHandler) {
+ h.addHandler(eh, false)
+}
+
+func (h *commonHook) addHandler(eh EventHandler, internal bool) {
+ // Ensure uniqueness of handlers
+ h.RemoveHandler(eh)
+
+ if !internal {
+ h.len++
+ }
+ // Add internal handlers to the beginning
+ if internal || h.head == nil {
+ h.head = &handler{eh, internal, false, h.head}
+ return
+ }
+ // Add handler after internal handlers
+ // TODO(austin) This should probably go on the end instead
+ prev := h.head
+ for prev.next != nil && prev.internal {
+ prev = prev.next
+ }
+ prev.next = &handler{eh, internal, false, prev.next}
+}
+
+func (h *commonHook) RemoveHandler(eh EventHandler) {
+ plink := &h.head
+ for l := *plink; l != nil; plink, l = &l.next, l.next {
+ if l.eh == eh {
+ if !l.internal {
+ h.len--
+ }
+ l.removed = true
+ *plink = l.next
+ break
+ }
+ }
+}
+
+func (h *commonHook) NumHandler() int { return h.len }
+
+func (h *commonHook) handle(e Event) (EventAction, os.Error) {
+ action := EADefault
+ plink := &h.head
+ for l := *plink; l != nil; plink, l = &l.next, l.next {
+ if l.removed {
+ continue
+ }
+ a, err := l.eh(e)
+ if a&EARemoveSelf == EARemoveSelf {
+ if !l.internal {
+ h.len--
+ }
+ l.removed = true
+ *plink = l.next
+ a &^= EARemoveSelf
+ }
+ if err != nil {
+ return EAStop, err
+ }
+ if a > action {
+ action = a
+ }
+ }
+ return action, nil
+}
+
+type commonEvent struct {
+ // The process of this event
+ p *Process
+ // The goroutine of this event.
+ t *Goroutine
+}
+
+func (e *commonEvent) Process() *Process { return e.p }
+
+func (e *commonEvent) Goroutine() *Goroutine { return e.t }
+
+/*
+ * Standard event handlers
+ */
+
+// EventPrint is a standard event handler that prints events as they
+// occur. It will not cause the process to stop.
+func EventPrint(ev Event) (EventAction, os.Error) {
+ // TODO(austin) Include process name here?
+ fmt.Fprintf(os.Stderr, "*** %v\n", ev.String())
+ return EADefault, nil
+}
+
+// EventStop is a standard event handler that causes the process to stop.
+func EventStop(ev Event) (EventAction, os.Error) {
+ return EAStop, nil
+}
+
+/*
+ * Breakpoints
+ */
+
+type breakpointHook struct {
+ commonHook
+ p *Process
+ pc proc.Word
+}
+
+// A Breakpoint event occurs when a process reaches a particular
+// program counter. When this event is handled, the current goroutine
+// will be the goroutine that reached the program counter.
+type Breakpoint struct {
+ commonEvent
+ osThread proc.Thread
+ pc proc.Word
+}
+
+func (h *breakpointHook) AddHandler(eh EventHandler) {
+ h.addHandler(eh, false)
+}
+
+func (h *breakpointHook) addHandler(eh EventHandler, internal bool) {
+ // We register breakpoint events lazily to avoid holding
+ // references to breakpoints without handlers. Be sure to use
+ // the "canonical" breakpoint if there is one.
+ if cur, ok := h.p.breakpointHooks[h.pc]; ok {
+ h = cur
+ }
+ oldhead := h.head
+ h.commonHook.addHandler(eh, internal)
+ if oldhead == nil && h.head != nil {
+ h.p.proc.AddBreakpoint(h.pc)
+ h.p.breakpointHooks[h.pc] = h
+ }
+}
+
+func (h *breakpointHook) RemoveHandler(eh EventHandler) {
+ oldhead := h.head
+ h.commonHook.RemoveHandler(eh)
+ if oldhead != nil && h.head == nil {
+ h.p.proc.RemoveBreakpoint(h.pc)
+ h.p.breakpointHooks[h.pc] = nil, false
+ }
+}
+
+func (h *breakpointHook) String() string {
+ // TODO(austin) Include process name?
+ // TODO(austin) Use line:pc or at least sym+%#x
+ return fmt.Sprintf("breakpoint at %#x", h.pc)
+}
+
+func (b *Breakpoint) PC() proc.Word { return b.pc }
+
+func (b *Breakpoint) String() string {
+ // TODO(austin) Include process name and goroutine
+ // TODO(austin) Use line:pc or at least sym+%#x
+ return fmt.Sprintf("breakpoint at %#x", b.pc)
+}
+
+/*
+ * Goroutine create/exit
+ */
+
+type goroutineCreateHook struct {
+ commonHook
+}
+
+func (h *goroutineCreateHook) String() string { return "goroutine create" }
+
+// A GoroutineCreate event occurs when a process creates a new
+// goroutine. When this event is handled, the current goroutine will
+// be the newly created goroutine.
+type GoroutineCreate struct {
+ commonEvent
+ parent *Goroutine
+}
+
+// Parent returns the goroutine that created this goroutine. May be
+// nil if this event is the creation of the first goroutine.
+func (e *GoroutineCreate) Parent() *Goroutine { return e.parent }
+
+func (e *GoroutineCreate) String() string {
+ // TODO(austin) Include process name
+ if e.parent == nil {
+ return fmt.Sprintf("%v created", e.t)
+ }
+ return fmt.Sprintf("%v created by %v", e.t, e.parent)
+}
+
+type goroutineExitHook struct {
+ commonHook
+}
+
+func (h *goroutineExitHook) String() string { return "goroutine exit" }
+
+// A GoroutineExit event occurs when a Go goroutine exits.
+type GoroutineExit struct {
+ commonEvent
+}
+
+func (e *GoroutineExit) String() string {
+ // TODO(austin) Include process name
+ //return fmt.Sprintf("%v exited", e.t);
+ // For debugging purposes
+ return fmt.Sprintf("goroutine %#x exited", e.t.g.addr().base)
+}
diff --git a/libgo/go/exp/ogle/frame.go b/libgo/go/exp/ogle/frame.go
new file mode 100644
index 0000000..1538362
--- /dev/null
+++ b/libgo/go/exp/ogle/frame.go
@@ -0,0 +1,212 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package ogle
+
+import (
+ "debug/gosym"
+ "debug/proc"
+ "fmt"
+ "os"
+)
+
+// A Frame represents a single frame on a remote call stack.
+type Frame struct {
+ // pc is the PC of the next instruction that will execute in
+ // this frame. For lower frames, this is the instruction
+ // following the CALL instruction.
+ pc, sp, fp proc.Word
+ // The runtime.Stktop of the active stack segment
+ stk remoteStruct
+ // The function this stack frame is in
+ fn *gosym.Func
+ // The path and line of the CALL or current instruction. Note
+ // that this differs slightly from the meaning of Frame.pc.
+ path string
+ line int
+ // The inner and outer frames of this frame. outer is filled
+ // in lazily.
+ inner, outer *Frame
+}
+
+// newFrame returns the top-most Frame of the given g's thread.
+func newFrame(g remoteStruct) (*Frame, os.Error) {
+ var f *Frame
+ err := try(func(a aborter) { f = aNewFrame(a, g) })
+ return f, err
+}
+
+func aNewFrame(a aborter, g remoteStruct) *Frame {
+ p := g.r.p
+ var pc, sp proc.Word
+
+ // Is this G alive?
+ switch g.field(p.f.G.Status).(remoteInt).aGet(a) {
+ case p.runtime.Gidle, p.runtime.Gmoribund, p.runtime.Gdead:
+ return nil
+ }
+
+ // Find the OS thread for this G
+
+ // TODO(austin) Ideally, we could look at the G's state and
+ // figure out if it's on an OS thread or not. However, this
+ // is difficult because the state isn't updated atomically
+ // with scheduling changes.
+ for _, t := range p.proc.Threads() {
+ regs, err := t.Regs()
+ if err != nil {
+ // TODO(austin) What to do?
+ continue
+ }
+ thisg := p.G(regs)
+ if thisg == g.addr().base {
+ // Found this G's OS thread
+ pc = regs.PC()
+ sp = regs.SP()
+
+ // If this thread crashed, try to recover it
+ if pc == 0 {
+ pc = p.peekUintptr(a, pc)
+ sp += 8
+ }
+
+ break
+ }
+ }
+
+ if pc == 0 && sp == 0 {
+ // G is not mapped to an OS thread. Use the
+ // scheduler's stored PC and SP.
+ sched := g.field(p.f.G.Sched).(remoteStruct)
+ pc = proc.Word(sched.field(p.f.Gobuf.Pc).(remoteUint).aGet(a))
+ sp = proc.Word(sched.field(p.f.Gobuf.Sp).(remoteUint).aGet(a))
+ }
+
+ // Get Stktop
+ stk := g.field(p.f.G.Stackbase).(remotePtr).aGet(a).(remoteStruct)
+
+ return prepareFrame(a, pc, sp, stk, nil)
+}
+
+// prepareFrame creates a Frame from the PC and SP within that frame,
+// as well as the active stack segment. This function takes care of
+// traversing stack breaks and unwinding closures.
+func prepareFrame(a aborter, pc, sp proc.Word, stk remoteStruct, inner *Frame) *Frame {
+ // Based on src/pkg/runtime/amd64/traceback.c:traceback
+ p := stk.r.p
+ top := inner == nil
+
+ // Get function
+ var path string
+ var line int
+ var fn *gosym.Func
+
+ for i := 0; i < 100; i++ {
+ // Traverse segmented stack breaks
+ if p.sys.lessstack != nil && pc == proc.Word(p.sys.lessstack.Value) {
+ // Get stk->gobuf.pc
+ pc = proc.Word(stk.field(p.f.Stktop.Gobuf).(remoteStruct).field(p.f.Gobuf.Pc).(remoteUint).aGet(a))
+ // Get stk->gobuf.sp
+ sp = proc.Word(stk.field(p.f.Stktop.Gobuf).(remoteStruct).field(p.f.Gobuf.Sp).(remoteUint).aGet(a))
+ // Get stk->stackbase
+ stk = stk.field(p.f.Stktop.Stackbase).(remotePtr).aGet(a).(remoteStruct)
+ continue
+ }
+
+ // Get the PC of the call instruction
+ callpc := pc
+ if !top && (p.sys.goexit == nil || pc != proc.Word(p.sys.goexit.Value)) {
+ callpc--
+ }
+
+ // Look up function
+ path, line, fn = p.syms.PCToLine(uint64(callpc))
+ if fn != nil {
+ break
+ }
+
+ // Closure?
+ var buf = make([]byte, p.ClosureSize())
+ if _, err := p.Peek(pc, buf); err != nil {
+ break
+ }
+ spdelta, ok := p.ParseClosure(buf)
+ if ok {
+ sp += proc.Word(spdelta)
+ pc = p.peekUintptr(a, sp-proc.Word(p.PtrSize()))
+ }
+ }
+ if fn == nil {
+ return nil
+ }
+
+ // Compute frame pointer
+ var fp proc.Word
+ if fn.FrameSize < p.PtrSize() {
+ fp = sp + proc.Word(p.PtrSize())
+ } else {
+ fp = sp + proc.Word(fn.FrameSize)
+ }
+ // TODO(austin) To really figure out if we're in the prologue,
+ // we need to disassemble the function and look for the call
+ // to morestack. For now, just special case the entry point.
+ //
+ // TODO(austin) What if we're in the call to morestack in the
+ // prologue? Then top == false.
+ if top && pc == proc.Word(fn.Entry) {
+ // We're in the function prologue, before SP
+ // has been adjusted for the frame.
+ fp -= proc.Word(fn.FrameSize - p.PtrSize())
+ }
+
+ return &Frame{pc, sp, fp, stk, fn, path, line, inner, nil}
+}
+
+// Outer returns the Frame that called this Frame, or nil if this is
+// the outermost frame.
+func (f *Frame) Outer() (*Frame, os.Error) {
+ var fr *Frame
+ err := try(func(a aborter) { fr = f.aOuter(a) })
+ return fr, err
+}
+
+func (f *Frame) aOuter(a aborter) *Frame {
+ // Is there a cached outer frame
+ if f.outer != nil {
+ return f.outer
+ }
+
+ p := f.stk.r.p
+
+ sp := f.fp
+ if f.fn == p.sys.newproc && f.fn == p.sys.deferproc {
+ // TODO(rsc) The compiler inserts two push/pop's
+ // around calls to go and defer. Russ says this
+ // should get fixed in the compiler, but we account
+ // for it for now.
+ sp += proc.Word(2 * p.PtrSize())
+ }
+
+ pc := p.peekUintptr(a, f.fp-proc.Word(p.PtrSize()))
+ if pc < 0x1000 {
+ return nil
+ }
+
+ // TODO(austin) Register this frame for shoot-down.
+
+ f.outer = prepareFrame(a, pc, sp, f.stk, f)
+ return f.outer
+}
+
+// Inner returns the Frame called by this Frame, or nil if this is the
+// innermost frame.
+func (f *Frame) Inner() *Frame { return f.inner }
+
+func (f *Frame) String() string {
+ res := f.fn.Name
+ if f.pc > proc.Word(f.fn.Value) {
+ res += fmt.Sprintf("+%#x", f.pc-proc.Word(f.fn.Entry))
+ }
+ return res + fmt.Sprintf(" %s:%d", f.path, f.line)
+}
diff --git a/libgo/go/exp/ogle/goroutine.go b/libgo/go/exp/ogle/goroutine.go
new file mode 100644
index 0000000..5104ec6
--- /dev/null
+++ b/libgo/go/exp/ogle/goroutine.go
@@ -0,0 +1,117 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package ogle
+
+import (
+ "debug/proc"
+ "exp/eval"
+ "fmt"
+ "os"
+)
+
+// A Goroutine represents a goroutine in a remote process.
+type Goroutine struct {
+ g remoteStruct
+ frame *Frame
+ dead bool
+}
+
+func (t *Goroutine) String() string {
+ if t.dead {
+ return "<dead thread>"
+ }
+ // TODO(austin) Give threads friendly ID's, possibly including
+ // the name of the entry function.
+ return fmt.Sprintf("thread %#x", t.g.addr().base)
+}
+
+// isG0 returns true if this thread if the internal idle thread
+func (t *Goroutine) isG0() bool { return t.g.addr().base == t.g.r.p.sys.g0.addr().base }
+
+func (t *Goroutine) resetFrame() (err os.Error) {
+ // TODO(austin) Reuse any live part of the current frame stack
+ // so existing references to Frame's keep working.
+ t.frame, err = newFrame(t.g)
+ return
+}
+
+// Out selects the caller frame of the current frame.
+func (t *Goroutine) Out() os.Error {
+ f, err := t.frame.Outer()
+ if f != nil {
+ t.frame = f
+ }
+ return err
+}
+
+// In selects the frame called by the current frame.
+func (t *Goroutine) In() os.Error {
+ f := t.frame.Inner()
+ if f != nil {
+ t.frame = f
+ }
+ return nil
+}
+
+func readylockedBP(ev Event) (EventAction, os.Error) {
+ b := ev.(*Breakpoint)
+ p := b.Process()
+
+ // The new g is the only argument to this function, so the
+ // stack will have the return address, then the G*.
+ regs, err := b.osThread.Regs()
+ if err != nil {
+ return EAStop, err
+ }
+ sp := regs.SP()
+ addr := sp + proc.Word(p.PtrSize())
+ arg := remotePtr{remote{addr, p}, p.runtime.G}
+ var gp eval.Value
+ err = try(func(a aborter) { gp = arg.aGet(a) })
+ if err != nil {
+ return EAStop, err
+ }
+ if gp == nil {
+ return EAStop, UnknownGoroutine{b.osThread, 0}
+ }
+ gs := gp.(remoteStruct)
+ g := &Goroutine{gs, nil, false}
+ p.goroutines[gs.addr().base] = g
+
+ // Enqueue goroutine creation event
+ parent := b.Goroutine()
+ if parent.isG0() {
+ parent = nil
+ }
+ p.postEvent(&GoroutineCreate{commonEvent{p, g}, parent})
+
+ // If we don't have any thread selected, select this one
+ if p.curGoroutine == nil {
+ p.curGoroutine = g
+ }
+
+ return EADefault, nil
+}
+
+func goexitBP(ev Event) (EventAction, os.Error) {
+ b := ev.(*Breakpoint)
+ p := b.Process()
+
+ g := b.Goroutine()
+ g.dead = true
+
+ addr := g.g.addr().base
+ p.goroutines[addr] = nil, false
+
+ // Enqueue thread exit event
+ p.postEvent(&GoroutineExit{commonEvent{p, g}})
+
+ // If we just exited our selected goroutine, selected another
+ if p.curGoroutine == g {
+ p.selectSomeGoroutine()
+ }
+
+ return EADefault, nil
+}
diff --git a/libgo/go/exp/ogle/main.go b/libgo/go/exp/ogle/main.go
new file mode 100644
index 0000000..1999ecc
--- /dev/null
+++ b/libgo/go/exp/ogle/main.go
@@ -0,0 +1,9 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package main
+
+import "exp/ogle"
+
+func main() { ogle.Main() }
diff --git a/libgo/go/exp/ogle/process.go b/libgo/go/exp/ogle/process.go
new file mode 100644
index 0000000..58e830a
--- /dev/null
+++ b/libgo/go/exp/ogle/process.go
@@ -0,0 +1,521 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package ogle
+
+import (
+ "debug/elf"
+ "debug/gosym"
+ "debug/proc"
+ "exp/eval"
+ "fmt"
+ "log"
+ "os"
+ "reflect"
+)
+
+// A FormatError indicates a failure to process information in or
+// about a remote process, such as unexpected or missing information
+// in the object file or runtime structures.
+type FormatError string
+
+func (e FormatError) String() string { return string(e) }
+
+// An UnknownArchitecture occurs when trying to load an object file
+// that indicates an architecture not supported by the debugger.
+type UnknownArchitecture elf.Machine
+
+func (e UnknownArchitecture) String() string {
+ return "unknown architecture: " + elf.Machine(e).String()
+}
+
+// A ProcessNotStopped error occurs when attempting to read or write
+// memory or registers of a process that is not stopped.
+type ProcessNotStopped struct{}
+
+func (e ProcessNotStopped) String() string { return "process not stopped" }
+
+// An UnknownGoroutine error is an internal error representing an
+// unrecognized G structure pointer.
+type UnknownGoroutine struct {
+ OSThread proc.Thread
+ Goroutine proc.Word
+}
+
+func (e UnknownGoroutine) String() string {
+ return fmt.Sprintf("internal error: unknown goroutine (G %#x)", e.Goroutine)
+}
+
+// A NoCurrentGoroutine error occurs when no goroutine is currently
+// selected in a process (or when there are no goroutines in a
+// process).
+type NoCurrentGoroutine struct{}
+
+func (e NoCurrentGoroutine) String() string { return "no current goroutine" }
+
+// A Process represents a remote attached process.
+type Process struct {
+ Arch
+ proc proc.Process
+
+ // The symbol table of this process
+ syms *gosym.Table
+
+ // A possibly-stopped OS thread, or nil
+ threadCache proc.Thread
+
+ // Types parsed from the remote process
+ types map[proc.Word]*remoteType
+
+ // Types and values from the remote runtime package
+ runtime runtimeValues
+
+ // Runtime field indexes
+ f runtimeIndexes
+
+ // Globals from the sys package (or from no package)
+ sys struct {
+ lessstack, goexit, newproc, deferproc, newprocreadylocked *gosym.Func
+ allg remotePtr
+ g0 remoteStruct
+ }
+
+ // Event queue
+ posted []Event
+ pending []Event
+ event Event
+
+ // Event hooks
+ breakpointHooks map[proc.Word]*breakpointHook
+ goroutineCreateHook *goroutineCreateHook
+ goroutineExitHook *goroutineExitHook
+
+ // Current goroutine, or nil if there are no goroutines
+ curGoroutine *Goroutine
+
+ // Goroutines by the address of their G structure
+ goroutines map[proc.Word]*Goroutine
+}
+
+/*
+ * Process creation
+ */
+
+// NewProcess constructs a new remote process around a traced
+// process, an architecture, and a symbol table.
+func NewProcess(tproc proc.Process, arch Arch, syms *gosym.Table) (*Process, os.Error) {
+ p := &Process{
+ Arch: arch,
+ proc: tproc,
+ syms: syms,
+ types: make(map[proc.Word]*remoteType),
+ breakpointHooks: make(map[proc.Word]*breakpointHook),
+ goroutineCreateHook: new(goroutineCreateHook),
+ goroutineExitHook: new(goroutineExitHook),
+ goroutines: make(map[proc.Word]*Goroutine),
+ }
+
+ // Fill in remote runtime
+ p.bootstrap()
+
+ switch {
+ case p.sys.allg.addr().base == 0:
+ return nil, FormatError("failed to find runtime symbol 'allg'")
+ case p.sys.g0.addr().base == 0:
+ return nil, FormatError("failed to find runtime symbol 'g0'")
+ case p.sys.newprocreadylocked == nil:
+ return nil, FormatError("failed to find runtime symbol 'newprocreadylocked'")
+ case p.sys.goexit == nil:
+ return nil, FormatError("failed to find runtime symbol 'sys.goexit'")
+ }
+
+ // Get current goroutines
+ p.goroutines[p.sys.g0.addr().base] = &Goroutine{p.sys.g0, nil, false}
+ err := try(func(a aborter) {
+ g := p.sys.allg.aGet(a)
+ for g != nil {
+ gs := g.(remoteStruct)
+ fmt.Printf("*** Found goroutine at %#x\n", gs.addr().base)
+ p.goroutines[gs.addr().base] = &Goroutine{gs, nil, false}
+ g = gs.field(p.f.G.Alllink).(remotePtr).aGet(a)
+ }
+ })
+ if err != nil {
+ return nil, err
+ }
+
+ // Create internal breakpoints to catch new and exited goroutines
+ p.OnBreakpoint(proc.Word(p.sys.newprocreadylocked.Entry)).(*breakpointHook).addHandler(readylockedBP, true)
+ p.OnBreakpoint(proc.Word(p.sys.goexit.Entry)).(*breakpointHook).addHandler(goexitBP, true)
+
+ // Select current frames
+ for _, g := range p.goroutines {
+ g.resetFrame()
+ }
+
+ p.selectSomeGoroutine()
+
+ return p, nil
+}
+
+func elfGoSyms(f *elf.File) (*gosym.Table, os.Error) {
+ text := f.Section(".text")
+ symtab := f.Section(".gosymtab")
+ pclntab := f.Section(".gopclntab")
+ if text == nil || symtab == nil || pclntab == nil {
+ return nil, nil
+ }
+
+ symdat, err := symtab.Data()
+ if err != nil {
+ return nil, err
+ }
+ pclndat, err := pclntab.Data()
+ if err != nil {
+ return nil, err
+ }
+
+ pcln := gosym.NewLineTable(pclndat, text.Addr)
+ tab, err := gosym.NewTable(symdat, pcln)
+ if err != nil {
+ return nil, err
+ }
+
+ return tab, nil
+}
+
+// NewProcessElf constructs a new remote process around a traced
+// process and the process' ELF object.
+func NewProcessElf(tproc proc.Process, f *elf.File) (*Process, os.Error) {
+ syms, err := elfGoSyms(f)
+ if err != nil {
+ return nil, err
+ }
+ if syms == nil {
+ return nil, FormatError("Failed to find symbol table")
+ }
+ var arch Arch
+ switch f.Machine {
+ case elf.EM_X86_64:
+ arch = Amd64
+ default:
+ return nil, UnknownArchitecture(f.Machine)
+ }
+ return NewProcess(tproc, arch, syms)
+}
+
+// bootstrap constructs the runtime structure of a remote process.
+func (p *Process) bootstrap() {
+ // Manually construct runtime types
+ p.runtime.String = newManualType(eval.TypeOfNative(rt1String{}), p.Arch)
+ p.runtime.Slice = newManualType(eval.TypeOfNative(rt1Slice{}), p.Arch)
+ p.runtime.Eface = newManualType(eval.TypeOfNative(rt1Eface{}), p.Arch)
+
+ p.runtime.Type = newManualType(eval.TypeOfNative(rt1Type{}), p.Arch)
+ p.runtime.CommonType = newManualType(eval.TypeOfNative(rt1CommonType{}), p.Arch)
+ p.runtime.UncommonType = newManualType(eval.TypeOfNative(rt1UncommonType{}), p.Arch)
+ p.runtime.StructField = newManualType(eval.TypeOfNative(rt1StructField{}), p.Arch)
+ p.runtime.StructType = newManualType(eval.TypeOfNative(rt1StructType{}), p.Arch)
+ p.runtime.PtrType = newManualType(eval.TypeOfNative(rt1PtrType{}), p.Arch)
+ p.runtime.ArrayType = newManualType(eval.TypeOfNative(rt1ArrayType{}), p.Arch)
+ p.runtime.SliceType = newManualType(eval.TypeOfNative(rt1SliceType{}), p.Arch)
+
+ p.runtime.Stktop = newManualType(eval.TypeOfNative(rt1Stktop{}), p.Arch)
+ p.runtime.Gobuf = newManualType(eval.TypeOfNative(rt1Gobuf{}), p.Arch)
+ p.runtime.G = newManualType(eval.TypeOfNative(rt1G{}), p.Arch)
+
+ // Get addresses of type.*runtime.XType for discrimination.
+ rtv := reflect.Indirect(reflect.NewValue(&p.runtime)).(*reflect.StructValue)
+ rtvt := rtv.Type().(*reflect.StructType)
+ for i := 0; i < rtv.NumField(); i++ {
+ n := rtvt.Field(i).Name
+ if n[0] != 'P' || n[1] < 'A' || n[1] > 'Z' {
+ continue
+ }
+ sym := p.syms.LookupSym("type.*runtime." + n[1:])
+ if sym == nil {
+ continue
+ }
+ rtv.Field(i).(*reflect.UintValue).Set(sym.Value)
+ }
+
+ // Get runtime field indexes
+ fillRuntimeIndexes(&p.runtime, &p.f)
+
+ // Fill G status
+ p.runtime.runtimeGStatus = rt1GStatus
+
+ // Get globals
+ p.sys.lessstack = p.syms.LookupFunc("sys.lessstack")
+ p.sys.goexit = p.syms.LookupFunc("goexit")
+ p.sys.newproc = p.syms.LookupFunc("sys.newproc")
+ p.sys.deferproc = p.syms.LookupFunc("sys.deferproc")
+ p.sys.newprocreadylocked = p.syms.LookupFunc("newprocreadylocked")
+ if allg := p.syms.LookupSym("allg"); allg != nil {
+ p.sys.allg = remotePtr{remote{proc.Word(allg.Value), p}, p.runtime.G}
+ }
+ if g0 := p.syms.LookupSym("g0"); g0 != nil {
+ p.sys.g0 = p.runtime.G.mk(remote{proc.Word(g0.Value), p}).(remoteStruct)
+ }
+}
+
+func (p *Process) selectSomeGoroutine() {
+ // Once we have friendly goroutine ID's, there might be a more
+ // reasonable behavior for this.
+ p.curGoroutine = nil
+ for _, g := range p.goroutines {
+ if !g.isG0() && g.frame != nil {
+ p.curGoroutine = g
+ return
+ }
+ }
+}
+
+/*
+ * Process memory
+ */
+
+func (p *Process) someStoppedOSThread() proc.Thread {
+ if p.threadCache != nil {
+ if _, err := p.threadCache.Stopped(); err == nil {
+ return p.threadCache
+ }
+ }
+
+ for _, t := range p.proc.Threads() {
+ if _, err := t.Stopped(); err == nil {
+ p.threadCache = t
+ return t
+ }
+ }
+ return nil
+}
+
+func (p *Process) Peek(addr proc.Word, out []byte) (int, os.Error) {
+ thr := p.someStoppedOSThread()
+ if thr == nil {
+ return 0, ProcessNotStopped{}
+ }
+ return thr.Peek(addr, out)
+}
+
+func (p *Process) Poke(addr proc.Word, b []byte) (int, os.Error) {
+ thr := p.someStoppedOSThread()
+ if thr == nil {
+ return 0, ProcessNotStopped{}
+ }
+ return thr.Poke(addr, b)
+}
+
+func (p *Process) peekUintptr(a aborter, addr proc.Word) proc.Word {
+ return proc.Word(mkUintptr(remote{addr, p}).(remoteUint).aGet(a))
+}
+
+/*
+ * Events
+ */
+
+// OnBreakpoint returns the hook that is run when the program reaches
+// the given program counter.
+func (p *Process) OnBreakpoint(pc proc.Word) EventHook {
+ if bp, ok := p.breakpointHooks[pc]; ok {
+ return bp
+ }
+ // The breakpoint will register itself when a handler is added
+ return &breakpointHook{commonHook{nil, 0}, p, pc}
+}
+
+// OnGoroutineCreate returns the hook that is run when a goroutine is created.
+func (p *Process) OnGoroutineCreate() EventHook {
+ return p.goroutineCreateHook
+}
+
+// OnGoroutineExit returns the hook that is run when a goroutine exits.
+func (p *Process) OnGoroutineExit() EventHook { return p.goroutineExitHook }
+
+// osThreadToGoroutine looks up the goroutine running on an OS thread.
+func (p *Process) osThreadToGoroutine(t proc.Thread) (*Goroutine, os.Error) {
+ regs, err := t.Regs()
+ if err != nil {
+ return nil, err
+ }
+ g := p.G(regs)
+ gt, ok := p.goroutines[g]
+ if !ok {
+ return nil, UnknownGoroutine{t, g}
+ }
+ return gt, nil
+}
+
+// causesToEvents translates the stop causes of the underlying process
+// into an event queue.
+func (p *Process) causesToEvents() ([]Event, os.Error) {
+ // Count causes we're interested in
+ nev := 0
+ for _, t := range p.proc.Threads() {
+ if c, err := t.Stopped(); err == nil {
+ switch c := c.(type) {
+ case proc.Breakpoint:
+ nev++
+ case proc.Signal:
+ // TODO(austin)
+ //nev++;
+ }
+ }
+ }
+
+ // Translate causes to events
+ events := make([]Event, nev)
+ i := 0
+ for _, t := range p.proc.Threads() {
+ if c, err := t.Stopped(); err == nil {
+ switch c := c.(type) {
+ case proc.Breakpoint:
+ gt, err := p.osThreadToGoroutine(t)
+ if err != nil {
+ return nil, err
+ }
+ events[i] = &Breakpoint{commonEvent{p, gt}, t, proc.Word(c)}
+ i++
+ case proc.Signal:
+ // TODO(austin)
+ }
+ }
+ }
+
+ return events, nil
+}
+
+// postEvent appends an event to the posted queue. These events will
+// be processed before any currently pending events.
+func (p *Process) postEvent(ev Event) {
+ p.posted = append(p.posted, ev)
+}
+
+// processEvents processes events in the event queue until no events
+// remain, a handler returns EAStop, or a handler returns an error.
+// It returns either EAStop or EAContinue and possibly an error.
+func (p *Process) processEvents() (EventAction, os.Error) {
+ var ev Event
+ for len(p.posted) > 0 {
+ ev, p.posted = p.posted[0], p.posted[1:]
+ action, err := p.processEvent(ev)
+ if action == EAStop {
+ return action, err
+ }
+ }
+
+ for len(p.pending) > 0 {
+ ev, p.pending = p.pending[0], p.pending[1:]
+ action, err := p.processEvent(ev)
+ if action == EAStop {
+ return action, err
+ }
+ }
+
+ return EAContinue, nil
+}
+
+// processEvent processes a single event, without manipulating the
+// event queues. It returns either EAStop or EAContinue and possibly
+// an error.
+func (p *Process) processEvent(ev Event) (EventAction, os.Error) {
+ p.event = ev
+
+ var action EventAction
+ var err os.Error
+ switch ev := p.event.(type) {
+ case *Breakpoint:
+ hook, ok := p.breakpointHooks[ev.pc]
+ if !ok {
+ break
+ }
+ p.curGoroutine = ev.Goroutine()
+ action, err = hook.handle(ev)
+
+ case *GoroutineCreate:
+ p.curGoroutine = ev.Goroutine()
+ action, err = p.goroutineCreateHook.handle(ev)
+
+ case *GoroutineExit:
+ action, err = p.goroutineExitHook.handle(ev)
+
+ default:
+ log.Panicf("Unknown event type %T in queue", p.event)
+ }
+
+ if err != nil {
+ return EAStop, err
+ } else if action == EAStop {
+ return EAStop, nil
+ }
+ return EAContinue, nil
+}
+
+// Event returns the last event that caused the process to stop. This
+// may return nil if the process has never been stopped by an event.
+//
+// TODO(austin) Return nil if the user calls p.Stop()?
+func (p *Process) Event() Event { return p.event }
+
+/*
+ * Process control
+ */
+
+// TODO(austin) Cont, WaitStop, and Stop. Need to figure out how
+// event handling works with these. Originally I did it only in
+// WaitStop, but if you Cont and there are pending events, then you
+// have to not actually continue and wait until a WaitStop to process
+// them, even if the event handlers will tell you to continue. We
+// could handle them in both Cont and WaitStop to avoid this problem,
+// but it's still weird if an event happens after the Cont and before
+// the WaitStop that the handlers say to continue from. Or we could
+// handle them on a separate thread. Then obviously you get weird
+// asynchronous things, like prints while the user it typing a command,
+// but that's not necessarily a bad thing.
+
+// ContWait resumes process execution and waits for an event to occur
+// that stops the process.
+func (p *Process) ContWait() os.Error {
+ for {
+ a, err := p.processEvents()
+ if err != nil {
+ return err
+ } else if a == EAStop {
+ break
+ }
+ err = p.proc.Continue()
+ if err != nil {
+ return err
+ }
+ err = p.proc.WaitStop()
+ if err != nil {
+ return err
+ }
+ for _, g := range p.goroutines {
+ g.resetFrame()
+ }
+ p.pending, err = p.causesToEvents()
+ if err != nil {
+ return err
+ }
+ }
+ return nil
+}
+
+// Out selects the caller frame of the current frame.
+func (p *Process) Out() os.Error {
+ if p.curGoroutine == nil {
+ return NoCurrentGoroutine{}
+ }
+ return p.curGoroutine.Out()
+}
+
+// In selects the frame called by the current frame.
+func (p *Process) In() os.Error {
+ if p.curGoroutine == nil {
+ return NoCurrentGoroutine{}
+ }
+ return p.curGoroutine.In()
+}
diff --git a/libgo/go/exp/ogle/rruntime.go b/libgo/go/exp/ogle/rruntime.go
new file mode 100644
index 0000000..33f1935
--- /dev/null
+++ b/libgo/go/exp/ogle/rruntime.go
@@ -0,0 +1,271 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package ogle
+
+import (
+ "debug/proc"
+ "exp/eval"
+ "reflect"
+)
+
+// This file contains remote runtime definitions. Using reflection,
+// we convert all of these to interpreter types and layout their
+// remote representations using the architecture rules.
+//
+// We could get most of these definitions from our own runtime
+// package; however, some of them differ in convenient ways, some of
+// them are not defined or exported by the runtime, and having our own
+// definitions makes it easy to support multiple remote runtime
+// versions. This may turn out to be overkill.
+//
+// All of these structures are prefixed with rt1 to indicate the
+// runtime version and to mark them as types used only as templates
+// for remote types.
+
+/*
+ * Runtime data headers
+ *
+ * See $GOROOT/src/pkg/runtime/runtime.h
+ */
+
+type rt1String struct {
+ str uintptr
+ len int
+}
+
+type rt1Slice struct {
+ array uintptr
+ len int
+ cap int
+}
+
+type rt1Eface struct {
+ typ uintptr
+ ptr uintptr
+}
+
+/*
+ * Runtime type structures
+ *
+ * See $GOROOT/src/pkg/runtime/type.h and $GOROOT/src/pkg/runtime/type.go
+ */
+
+type rt1UncommonType struct {
+ name *string
+ pkgPath *string
+ //methods []method;
+}
+
+type rt1CommonType struct {
+ size uintptr
+ hash uint32
+ alg, align, fieldAlign uint8
+ string *string
+ uncommonType *rt1UncommonType
+}
+
+type rt1Type struct {
+ // While Type is technically an Eface, treating the
+ // discriminator as an opaque pointer and taking advantage of
+ // the commonType prologue on all Type's makes type parsing
+ // much simpler.
+ typ uintptr
+ ptr *rt1CommonType
+}
+
+type rt1StructField struct {
+ name *string
+ pkgPath *string
+ typ *rt1Type
+ tag *string
+ offset uintptr
+}
+
+type rt1StructType struct {
+ rt1CommonType
+ fields []rt1StructField
+}
+
+type rt1PtrType struct {
+ rt1CommonType
+ elem *rt1Type
+}
+
+type rt1SliceType struct {
+ rt1CommonType
+ elem *rt1Type
+}
+
+type rt1ArrayType struct {
+ rt1CommonType
+ elem *rt1Type
+ len uintptr
+}
+
+/*
+ * Runtime scheduler structures
+ *
+ * See $GOROOT/src/pkg/runtime/runtime.h
+ */
+
+// Fields beginning with _ are only for padding
+
+type rt1Stktop struct {
+ stackguard uintptr
+ stackbase *rt1Stktop
+ gobuf rt1Gobuf
+ _args uint32
+ _fp uintptr
+}
+
+type rt1Gobuf struct {
+ sp uintptr
+ pc uintptr
+ g *rt1G
+ r0 uintptr
+}
+
+type rt1G struct {
+ _stackguard uintptr
+ stackbase *rt1Stktop
+ _defer uintptr
+ sched rt1Gobuf
+ _stack0 uintptr
+ _entry uintptr
+ alllink *rt1G
+ _param uintptr
+ status int16
+ // Incomplete
+}
+
+var rt1GStatus = runtimeGStatus{
+ Gidle: 0,
+ Grunnable: 1,
+ Grunning: 2,
+ Gsyscall: 3,
+ Gwaiting: 4,
+ Gmoribund: 5,
+ Gdead: 6,
+}
+
+// runtimeIndexes stores the indexes of fields in the runtime
+// structures. It is filled in using reflection, so the name of the
+// fields must match the names of the remoteType's in runtimeValues
+// exactly and the names of the index fields must be the capitalized
+// version of the names of the fields in the runtime structures above.
+type runtimeIndexes struct {
+ String struct {
+ Str, Len int
+ }
+ Slice struct {
+ Array, Len, Cap int
+ }
+ Eface struct {
+ Typ, Ptr int
+ }
+
+ UncommonType struct {
+ Name, PkgPath int
+ }
+ CommonType struct {
+ Size, Hash, Alg, Align, FieldAlign, String, UncommonType int
+ }
+ Type struct {
+ Typ, Ptr int
+ }
+ StructField struct {
+ Name, PkgPath, Typ, Tag, Offset int
+ }
+ StructType struct {
+ Fields int
+ }
+ PtrType struct {
+ Elem int
+ }
+ SliceType struct {
+ Elem int
+ }
+ ArrayType struct {
+ Elem, Len int
+ }
+
+ Stktop struct {
+ Stackguard, Stackbase, Gobuf int
+ }
+ Gobuf struct {
+ Sp, Pc, G int
+ }
+ G struct {
+ Stackbase, Sched, Status, Alllink int
+ }
+}
+
+// Values of G status codes
+type runtimeGStatus struct {
+ Gidle, Grunnable, Grunning, Gsyscall, Gwaiting, Gmoribund, Gdead int64
+}
+
+// runtimeValues stores the types and values that correspond to those
+// in the remote runtime package.
+type runtimeValues struct {
+ // Runtime data headers
+ String, Slice, Eface *remoteType
+ // Runtime type structures
+ Type, CommonType, UncommonType, StructField, StructType, PtrType,
+ ArrayType, SliceType *remoteType
+ // Runtime scheduler structures
+ Stktop, Gobuf, G *remoteType
+ // Addresses of *runtime.XType types. These are the
+ // discriminators on the runtime.Type interface. We use local
+ // reflection to fill these in from the remote symbol table,
+ // so the names must match the runtime names.
+ PBoolType,
+ PUint8Type, PUint16Type, PUint32Type, PUint64Type, PUintType, PUintptrType,
+ PInt8Type, PInt16Type, PInt32Type, PInt64Type, PIntType,
+ PFloat32Type, PFloat64Type, PFloatType,
+ PArrayType, PStringType, PStructType, PPtrType, PFuncType,
+ PInterfaceType, PSliceType, PMapType, PChanType,
+ PDotDotDotType, PUnsafePointerType proc.Word
+ // G status values
+ runtimeGStatus
+}
+
+// fillRuntimeIndexes fills a runtimeIndexes structure will the field
+// indexes gathered from the remoteTypes recorded in a runtimeValues
+// structure.
+func fillRuntimeIndexes(runtime *runtimeValues, out *runtimeIndexes) {
+ outv := reflect.Indirect(reflect.NewValue(out)).(*reflect.StructValue)
+ outt := outv.Type().(*reflect.StructType)
+ runtimev := reflect.Indirect(reflect.NewValue(runtime)).(*reflect.StructValue)
+
+ // out contains fields corresponding to each runtime type
+ for i := 0; i < outt.NumField(); i++ {
+ // Find the interpreter type for this runtime type
+ name := outt.Field(i).Name
+ et := runtimev.FieldByName(name).Interface().(*remoteType).Type.(*eval.StructType)
+
+ // Get the field indexes of the interpreter struct type
+ indexes := make(map[string]int, len(et.Elems))
+ for j, f := range et.Elems {
+ if f.Anonymous {
+ continue
+ }
+ name := f.Name
+ if name[0] >= 'a' && name[0] <= 'z' {
+ name = string(name[0]+'A'-'a') + name[1:]
+ }
+ indexes[name] = j
+ }
+
+ // Fill this field of out
+ outStructv := outv.Field(i).(*reflect.StructValue)
+ outStructt := outStructv.Type().(*reflect.StructType)
+ for j := 0; j < outStructt.NumField(); j++ {
+ f := outStructv.Field(j).(*reflect.IntValue)
+ name := outStructt.Field(j).Name
+ f.Set(int64(indexes[name]))
+ }
+ }
+}
diff --git a/libgo/go/exp/ogle/rtype.go b/libgo/go/exp/ogle/rtype.go
new file mode 100644
index 0000000..fd77f1b
--- /dev/null
+++ b/libgo/go/exp/ogle/rtype.go
@@ -0,0 +1,291 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package ogle
+
+import (
+ "debug/proc"
+ "exp/eval"
+ "fmt"
+ "log"
+)
+
+const debugParseRemoteType = false
+
+// A remoteType is the local representation of a type in a remote process.
+type remoteType struct {
+ eval.Type
+ // The size of values of this type in bytes.
+ size int
+ // The field alignment of this type. Only used for
+ // manually-constructed types.
+ fieldAlign int
+ // The maker function to turn a remote address of a value of
+ // this type into an interpreter Value.
+ mk maker
+}
+
+var manualTypes = make(map[Arch]map[eval.Type]*remoteType)
+
+// newManualType constructs a remote type from an interpreter Type
+// using the size and alignment properties of the given architecture.
+// Most types are parsed directly out of the remote process, but to do
+// so we need to layout the structures that describe those types ourselves.
+func newManualType(t eval.Type, arch Arch) *remoteType {
+ if nt, ok := t.(*eval.NamedType); ok {
+ t = nt.Def
+ }
+
+ // Get the type map for this architecture
+ typeMap := manualTypes[arch]
+ if typeMap == nil {
+ typeMap = make(map[eval.Type]*remoteType)
+ manualTypes[arch] = typeMap
+
+ // Construct basic types for this architecture
+ basicType := func(t eval.Type, mk maker, size int, fieldAlign int) {
+ t = t.(*eval.NamedType).Def
+ if fieldAlign == 0 {
+ fieldAlign = size
+ }
+ typeMap[t] = &remoteType{t, size, fieldAlign, mk}
+ }
+ basicType(eval.Uint8Type, mkUint8, 1, 0)
+ basicType(eval.Uint32Type, mkUint32, 4, 0)
+ basicType(eval.UintptrType, mkUintptr, arch.PtrSize(), 0)
+ basicType(eval.Int16Type, mkInt16, 2, 0)
+ basicType(eval.Int32Type, mkInt32, 4, 0)
+ basicType(eval.IntType, mkInt, arch.IntSize(), 0)
+ basicType(eval.StringType, mkString, arch.PtrSize()+arch.IntSize(), arch.PtrSize())
+ }
+
+ if rt, ok := typeMap[t]; ok {
+ return rt
+ }
+
+ var rt *remoteType
+ switch t := t.(type) {
+ case *eval.PtrType:
+ var elem *remoteType
+ mk := func(r remote) eval.Value { return remotePtr{r, elem} }
+ rt = &remoteType{t, arch.PtrSize(), arch.PtrSize(), mk}
+ // Construct the element type after registering the
+ // type to break cycles.
+ typeMap[eval.Type(t)] = rt
+ elem = newManualType(t.Elem, arch)
+
+ case *eval.ArrayType:
+ elem := newManualType(t.Elem, arch)
+ mk := func(r remote) eval.Value { return remoteArray{r, t.Len, elem} }
+ rt = &remoteType{t, elem.size * int(t.Len), elem.fieldAlign, mk}
+
+ case *eval.SliceType:
+ elem := newManualType(t.Elem, arch)
+ mk := func(r remote) eval.Value { return remoteSlice{r, elem} }
+ rt = &remoteType{t, arch.PtrSize() + 2*arch.IntSize(), arch.PtrSize(), mk}
+
+ case *eval.StructType:
+ layout := make([]remoteStructField, len(t.Elems))
+ offset := 0
+ fieldAlign := 0
+ for i, f := range t.Elems {
+ elem := newManualType(f.Type, arch)
+ if fieldAlign == 0 {
+ fieldAlign = elem.fieldAlign
+ }
+ offset = arch.Align(offset, elem.fieldAlign)
+ layout[i].offset = offset
+ layout[i].fieldType = elem
+ offset += elem.size
+ }
+ mk := func(r remote) eval.Value { return remoteStruct{r, layout} }
+ rt = &remoteType{t, offset, fieldAlign, mk}
+
+ default:
+ log.Panicf("cannot manually construct type %T", t)
+ }
+
+ typeMap[t] = rt
+ return rt
+}
+
+var prtIndent = ""
+
+// parseRemoteType parses a Type structure in a remote process to
+// construct the corresponding interpreter type and remote type.
+func parseRemoteType(a aborter, rs remoteStruct) *remoteType {
+ addr := rs.addr().base
+ p := rs.addr().p
+
+ // We deal with circular types by discovering cycles at
+ // NamedTypes. If a type cycles back to something other than
+ // a named type, we're guaranteed that there will be a named
+ // type somewhere in that cycle. Thus, we continue down,
+ // re-parsing types until we reach the named type in the
+ // cycle. In order to still create one remoteType per remote
+ // type, we insert an empty remoteType in the type map the
+ // first time we encounter the type and re-use that structure
+ // the second time we encounter it.
+
+ rt, ok := p.types[addr]
+ if ok && rt.Type != nil {
+ return rt
+ } else if !ok {
+ rt = &remoteType{}
+ p.types[addr] = rt
+ }
+
+ if debugParseRemoteType {
+ sym := p.syms.SymByAddr(uint64(addr))
+ name := "<unknown>"
+ if sym != nil {
+ name = sym.Name
+ }
+ log.Printf("%sParsing type at %#x (%s)", prtIndent, addr, name)
+ prtIndent += " "
+ defer func() { prtIndent = prtIndent[0 : len(prtIndent)-1] }()
+ }
+
+ // Get Type header
+ itype := proc.Word(rs.field(p.f.Type.Typ).(remoteUint).aGet(a))
+ typ := rs.field(p.f.Type.Ptr).(remotePtr).aGet(a).(remoteStruct)
+
+ // Is this a named type?
+ var nt *eval.NamedType
+ uncommon := typ.field(p.f.CommonType.UncommonType).(remotePtr).aGet(a)
+ if uncommon != nil {
+ name := uncommon.(remoteStruct).field(p.f.UncommonType.Name).(remotePtr).aGet(a)
+ if name != nil {
+ // TODO(austin) Declare type in appropriate remote package
+ nt = eval.NewNamedType(name.(remoteString).aGet(a))
+ rt.Type = nt
+ }
+ }
+
+ // Create type
+ var t eval.Type
+ var mk maker
+ switch itype {
+ case p.runtime.PBoolType:
+ t = eval.BoolType
+ mk = mkBool
+ case p.runtime.PUint8Type:
+ t = eval.Uint8Type
+ mk = mkUint8
+ case p.runtime.PUint16Type:
+ t = eval.Uint16Type
+ mk = mkUint16
+ case p.runtime.PUint32Type:
+ t = eval.Uint32Type
+ mk = mkUint32
+ case p.runtime.PUint64Type:
+ t = eval.Uint64Type
+ mk = mkUint64
+ case p.runtime.PUintType:
+ t = eval.UintType
+ mk = mkUint
+ case p.runtime.PUintptrType:
+ t = eval.UintptrType
+ mk = mkUintptr
+ case p.runtime.PInt8Type:
+ t = eval.Int8Type
+ mk = mkInt8
+ case p.runtime.PInt16Type:
+ t = eval.Int16Type
+ mk = mkInt16
+ case p.runtime.PInt32Type:
+ t = eval.Int32Type
+ mk = mkInt32
+ case p.runtime.PInt64Type:
+ t = eval.Int64Type
+ mk = mkInt64
+ case p.runtime.PIntType:
+ t = eval.IntType
+ mk = mkInt
+ case p.runtime.PFloat32Type:
+ t = eval.Float32Type
+ mk = mkFloat32
+ case p.runtime.PFloat64Type:
+ t = eval.Float64Type
+ mk = mkFloat64
+ case p.runtime.PFloatType:
+ t = eval.FloatType
+ mk = mkFloat
+ case p.runtime.PStringType:
+ t = eval.StringType
+ mk = mkString
+
+ case p.runtime.PArrayType:
+ // Cast to an ArrayType
+ typ := p.runtime.ArrayType.mk(typ.addr()).(remoteStruct)
+ len := int64(typ.field(p.f.ArrayType.Len).(remoteUint).aGet(a))
+ elem := parseRemoteType(a, typ.field(p.f.ArrayType.Elem).(remotePtr).aGet(a).(remoteStruct))
+ t = eval.NewArrayType(len, elem.Type)
+ mk = func(r remote) eval.Value { return remoteArray{r, len, elem} }
+
+ case p.runtime.PStructType:
+ // Cast to a StructType
+ typ := p.runtime.StructType.mk(typ.addr()).(remoteStruct)
+ fs := typ.field(p.f.StructType.Fields).(remoteSlice).aGet(a)
+
+ fields := make([]eval.StructField, fs.Len)
+ layout := make([]remoteStructField, fs.Len)
+ for i := range fields {
+ f := fs.Base.(remoteArray).elem(int64(i)).(remoteStruct)
+ elemrs := f.field(p.f.StructField.Typ).(remotePtr).aGet(a).(remoteStruct)
+ elem := parseRemoteType(a, elemrs)
+ fields[i].Type = elem.Type
+ name := f.field(p.f.StructField.Name).(remotePtr).aGet(a)
+ if name == nil {
+ fields[i].Anonymous = true
+ } else {
+ fields[i].Name = name.(remoteString).aGet(a)
+ }
+ layout[i].offset = int(f.field(p.f.StructField.Offset).(remoteUint).aGet(a))
+ layout[i].fieldType = elem
+ }
+
+ t = eval.NewStructType(fields)
+ mk = func(r remote) eval.Value { return remoteStruct{r, layout} }
+
+ case p.runtime.PPtrType:
+ // Cast to a PtrType
+ typ := p.runtime.PtrType.mk(typ.addr()).(remoteStruct)
+ elem := parseRemoteType(a, typ.field(p.f.PtrType.Elem).(remotePtr).aGet(a).(remoteStruct))
+ t = eval.NewPtrType(elem.Type)
+ mk = func(r remote) eval.Value { return remotePtr{r, elem} }
+
+ case p.runtime.PSliceType:
+ // Cast to a SliceType
+ typ := p.runtime.SliceType.mk(typ.addr()).(remoteStruct)
+ elem := parseRemoteType(a, typ.field(p.f.SliceType.Elem).(remotePtr).aGet(a).(remoteStruct))
+ t = eval.NewSliceType(elem.Type)
+ mk = func(r remote) eval.Value { return remoteSlice{r, elem} }
+
+ case p.runtime.PMapType, p.runtime.PChanType, p.runtime.PFuncType, p.runtime.PInterfaceType, p.runtime.PUnsafePointerType, p.runtime.PDotDotDotType:
+ // TODO(austin)
+ t = eval.UintptrType
+ mk = mkUintptr
+
+ default:
+ sym := p.syms.SymByAddr(uint64(itype))
+ name := "<unknown symbol>"
+ if sym != nil {
+ name = sym.Name
+ }
+ err := fmt.Sprintf("runtime type at %#x has unexpected type %#x (%s)", addr, itype, name)
+ a.Abort(FormatError(err))
+ }
+
+ // Fill in the remote type
+ if nt != nil {
+ nt.Complete(t)
+ } else {
+ rt.Type = t
+ }
+ rt.size = int(typ.field(p.f.CommonType.Size).(remoteUint).aGet(a))
+ rt.mk = mk
+
+ return rt
+}
diff --git a/libgo/go/exp/ogle/rvalue.go b/libgo/go/exp/ogle/rvalue.go
new file mode 100644
index 0000000..3d630f9
--- /dev/null
+++ b/libgo/go/exp/ogle/rvalue.go
@@ -0,0 +1,515 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package ogle
+
+import (
+ "debug/proc"
+ "exp/eval"
+ "fmt"
+)
+
+// A RemoteMismatchError occurs when an operation that requires two
+// identical remote processes is given different process. For
+// example, this occurs when trying to set a pointer in one process to
+// point to something in another process.
+type RemoteMismatchError string
+
+func (e RemoteMismatchError) String() string { return string(e) }
+
+// A ReadOnlyError occurs when attempting to set or assign to a
+// read-only value.
+type ReadOnlyError string
+
+func (e ReadOnlyError) String() string { return string(e) }
+
+// A maker is a function that converts a remote address into an
+// interpreter Value.
+type maker func(remote) eval.Value
+
+type remoteValue interface {
+ addr() remote
+}
+
+// remote represents an address in a remote process.
+type remote struct {
+ base proc.Word
+ p *Process
+}
+
+func (v remote) Get(a aborter, size int) uint64 {
+ // TODO(austin) This variable might temporarily be in a
+ // register. We could trace the assembly back from the
+ // current PC, looking for the beginning of the function or a
+ // call (both of which guarantee that the variable is in
+ // memory), or an instruction that loads the variable into a
+ // register.
+ //
+ // TODO(austin) If this is a local variable, it might not be
+ // live at this PC. In fact, because the compiler reuses
+ // slots, there might even be a different local variable at
+ // this location right now. A simple solution to both
+ // problems is to include the range of PC's over which a local
+ // variable is live in the symbol table.
+ //
+ // TODO(austin) We need to prevent the remote garbage
+ // collector from collecting objects out from under us.
+ var arr [8]byte
+ buf := arr[0:size]
+ _, err := v.p.Peek(v.base, buf)
+ if err != nil {
+ a.Abort(err)
+ }
+ return uint64(v.p.ToWord(buf))
+}
+
+func (v remote) Set(a aborter, size int, x uint64) {
+ var arr [8]byte
+ buf := arr[0:size]
+ v.p.FromWord(proc.Word(x), buf)
+ _, err := v.p.Poke(v.base, buf)
+ if err != nil {
+ a.Abort(err)
+ }
+}
+
+func (v remote) plus(x proc.Word) remote { return remote{v.base + x, v.p} }
+
+func tryRVString(f func(a aborter) string) string {
+ var s string
+ err := try(func(a aborter) { s = f(a) })
+ if err != nil {
+ return fmt.Sprintf("<error: %v>", err)
+ }
+ return s
+}
+
+/*
+ * Bool
+ */
+
+type remoteBool struct {
+ r remote
+}
+
+func (v remoteBool) String() string {
+ return tryRVString(func(a aborter) string { return fmt.Sprintf("%v", v.aGet(a)) })
+}
+
+func (v remoteBool) Assign(t *eval.Thread, o eval.Value) {
+ v.Set(t, o.(eval.BoolValue).Get(t))
+}
+
+func (v remoteBool) Get(t *eval.Thread) bool { return v.aGet(t) }
+
+func (v remoteBool) aGet(a aborter) bool { return v.r.Get(a, 1) != 0 }
+
+func (v remoteBool) Set(t *eval.Thread, x bool) {
+ v.aSet(t, x)
+}
+
+func (v remoteBool) aSet(a aborter, x bool) {
+ if x {
+ v.r.Set(a, 1, 1)
+ } else {
+ v.r.Set(a, 1, 0)
+ }
+}
+
+func (v remoteBool) addr() remote { return v.r }
+
+func mkBool(r remote) eval.Value { return remoteBool{r} }
+
+/*
+ * Uint
+ */
+
+type remoteUint struct {
+ r remote
+ size int
+}
+
+func (v remoteUint) String() string {
+ return tryRVString(func(a aborter) string { return fmt.Sprintf("%v", v.aGet(a)) })
+}
+
+func (v remoteUint) Assign(t *eval.Thread, o eval.Value) {
+ v.Set(t, o.(eval.UintValue).Get(t))
+}
+
+func (v remoteUint) Get(t *eval.Thread) uint64 {
+ return v.aGet(t)
+}
+
+func (v remoteUint) aGet(a aborter) uint64 { return v.r.Get(a, v.size) }
+
+func (v remoteUint) Set(t *eval.Thread, x uint64) {
+ v.aSet(t, x)
+}
+
+func (v remoteUint) aSet(a aborter, x uint64) { v.r.Set(a, v.size, x) }
+
+func (v remoteUint) addr() remote { return v.r }
+
+func mkUint8(r remote) eval.Value { return remoteUint{r, 1} }
+
+func mkUint16(r remote) eval.Value { return remoteUint{r, 2} }
+
+func mkUint32(r remote) eval.Value { return remoteUint{r, 4} }
+
+func mkUint64(r remote) eval.Value { return remoteUint{r, 8} }
+
+func mkUint(r remote) eval.Value { return remoteUint{r, r.p.IntSize()} }
+
+func mkUintptr(r remote) eval.Value { return remoteUint{r, r.p.PtrSize()} }
+
+/*
+ * Int
+ */
+
+type remoteInt struct {
+ r remote
+ size int
+}
+
+func (v remoteInt) String() string {
+ return tryRVString(func(a aborter) string { return fmt.Sprintf("%v", v.aGet(a)) })
+}
+
+func (v remoteInt) Assign(t *eval.Thread, o eval.Value) {
+ v.Set(t, o.(eval.IntValue).Get(t))
+}
+
+func (v remoteInt) Get(t *eval.Thread) int64 { return v.aGet(t) }
+
+func (v remoteInt) aGet(a aborter) int64 { return int64(v.r.Get(a, v.size)) }
+
+func (v remoteInt) Set(t *eval.Thread, x int64) {
+ v.aSet(t, x)
+}
+
+func (v remoteInt) aSet(a aborter, x int64) { v.r.Set(a, v.size, uint64(x)) }
+
+func (v remoteInt) addr() remote { return v.r }
+
+func mkInt8(r remote) eval.Value { return remoteInt{r, 1} }
+
+func mkInt16(r remote) eval.Value { return remoteInt{r, 2} }
+
+func mkInt32(r remote) eval.Value { return remoteInt{r, 4} }
+
+func mkInt64(r remote) eval.Value { return remoteInt{r, 8} }
+
+func mkInt(r remote) eval.Value { return remoteInt{r, r.p.IntSize()} }
+
+/*
+ * Float
+ */
+
+type remoteFloat struct {
+ r remote
+ size int
+}
+
+func (v remoteFloat) String() string {
+ return tryRVString(func(a aborter) string { return fmt.Sprintf("%v", v.aGet(a)) })
+}
+
+func (v remoteFloat) Assign(t *eval.Thread, o eval.Value) {
+ v.Set(t, o.(eval.FloatValue).Get(t))
+}
+
+func (v remoteFloat) Get(t *eval.Thread) float64 {
+ return v.aGet(t)
+}
+
+func (v remoteFloat) aGet(a aborter) float64 {
+ bits := v.r.Get(a, v.size)
+ switch v.size {
+ case 4:
+ return float64(v.r.p.ToFloat32(uint32(bits)))
+ case 8:
+ return v.r.p.ToFloat64(bits)
+ }
+ panic("Unexpected float size")
+}
+
+func (v remoteFloat) Set(t *eval.Thread, x float64) {
+ v.aSet(t, x)
+}
+
+func (v remoteFloat) aSet(a aborter, x float64) {
+ var bits uint64
+ switch v.size {
+ case 4:
+ bits = uint64(v.r.p.FromFloat32(float32(x)))
+ case 8:
+ bits = v.r.p.FromFloat64(x)
+ default:
+ panic("Unexpected float size")
+ }
+ v.r.Set(a, v.size, bits)
+}
+
+func (v remoteFloat) addr() remote { return v.r }
+
+func mkFloat32(r remote) eval.Value { return remoteFloat{r, 4} }
+
+func mkFloat64(r remote) eval.Value { return remoteFloat{r, 8} }
+
+func mkFloat(r remote) eval.Value { return remoteFloat{r, r.p.FloatSize()} }
+
+/*
+ * String
+ */
+
+type remoteString struct {
+ r remote
+}
+
+func (v remoteString) String() string {
+ return tryRVString(func(a aborter) string { return v.aGet(a) })
+}
+
+func (v remoteString) Assign(t *eval.Thread, o eval.Value) {
+ v.Set(t, o.(eval.StringValue).Get(t))
+}
+
+func (v remoteString) Get(t *eval.Thread) string {
+ return v.aGet(t)
+}
+
+func (v remoteString) aGet(a aborter) string {
+ rs := v.r.p.runtime.String.mk(v.r).(remoteStruct)
+ str := proc.Word(rs.field(v.r.p.f.String.Str).(remoteUint).aGet(a))
+ len := rs.field(v.r.p.f.String.Len).(remoteInt).aGet(a)
+
+ bytes := make([]uint8, len)
+ _, err := v.r.p.Peek(str, bytes)
+ if err != nil {
+ a.Abort(err)
+ }
+ return string(bytes)
+}
+
+func (v remoteString) Set(t *eval.Thread, x string) {
+ v.aSet(t, x)
+}
+
+func (v remoteString) aSet(a aborter, x string) {
+ // TODO(austin) This isn't generally possible without the
+ // ability to allocate remote memory.
+ a.Abort(ReadOnlyError("remote strings cannot be assigned to"))
+}
+
+func mkString(r remote) eval.Value { return remoteString{r} }
+
+/*
+ * Array
+ */
+
+type remoteArray struct {
+ r remote
+ len int64
+ elemType *remoteType
+}
+
+func (v remoteArray) String() string {
+ res := "{"
+ for i := int64(0); i < v.len; i++ {
+ if i > 0 {
+ res += ", "
+ }
+ res += v.elem(i).String()
+ }
+ return res + "}"
+}
+
+func (v remoteArray) Assign(t *eval.Thread, o eval.Value) {
+ // TODO(austin) Could do a bigger memcpy if o is a
+ // remoteArray in the same Process.
+ oa := o.(eval.ArrayValue)
+ for i := int64(0); i < v.len; i++ {
+ v.Elem(t, i).Assign(t, oa.Elem(t, i))
+ }
+}
+
+func (v remoteArray) Get(t *eval.Thread) eval.ArrayValue {
+ return v
+}
+
+func (v remoteArray) Elem(t *eval.Thread, i int64) eval.Value {
+ return v.elem(i)
+}
+
+func (v remoteArray) elem(i int64) eval.Value {
+ return v.elemType.mk(v.r.plus(proc.Word(int64(v.elemType.size) * i)))
+}
+
+func (v remoteArray) Sub(i int64, len int64) eval.ArrayValue {
+ return remoteArray{v.r.plus(proc.Word(int64(v.elemType.size) * i)), len, v.elemType}
+}
+
+/*
+ * Struct
+ */
+
+type remoteStruct struct {
+ r remote
+ layout []remoteStructField
+}
+
+type remoteStructField struct {
+ offset int
+ fieldType *remoteType
+}
+
+func (v remoteStruct) String() string {
+ res := "{"
+ for i := range v.layout {
+ if i > 0 {
+ res += ", "
+ }
+ res += v.field(i).String()
+ }
+ return res + "}"
+}
+
+func (v remoteStruct) Assign(t *eval.Thread, o eval.Value) {
+ // TODO(austin) Could do a bigger memcpy.
+ oa := o.(eval.StructValue)
+ l := len(v.layout)
+ for i := 0; i < l; i++ {
+ v.Field(t, i).Assign(t, oa.Field(t, i))
+ }
+}
+
+func (v remoteStruct) Get(t *eval.Thread) eval.StructValue {
+ return v
+}
+
+func (v remoteStruct) Field(t *eval.Thread, i int) eval.Value {
+ return v.field(i)
+}
+
+func (v remoteStruct) field(i int) eval.Value {
+ f := &v.layout[i]
+ return f.fieldType.mk(v.r.plus(proc.Word(f.offset)))
+}
+
+func (v remoteStruct) addr() remote { return v.r }
+
+/*
+ * Pointer
+ */
+
+// TODO(austin) Comparing two remote pointers for equality in the
+// interpreter will crash it because the Value's returned from
+// remotePtr.Get() will be structs.
+
+type remotePtr struct {
+ r remote
+ elemType *remoteType
+}
+
+func (v remotePtr) String() string {
+ return tryRVString(func(a aborter) string {
+ e := v.aGet(a)
+ if e == nil {
+ return "<nil>"
+ }
+ return "&" + e.String()
+ })
+}
+
+func (v remotePtr) Assign(t *eval.Thread, o eval.Value) {
+ v.Set(t, o.(eval.PtrValue).Get(t))
+}
+
+func (v remotePtr) Get(t *eval.Thread) eval.Value {
+ return v.aGet(t)
+}
+
+func (v remotePtr) aGet(a aborter) eval.Value {
+ addr := proc.Word(v.r.Get(a, v.r.p.PtrSize()))
+ if addr == 0 {
+ return nil
+ }
+ return v.elemType.mk(remote{addr, v.r.p})
+}
+
+func (v remotePtr) Set(t *eval.Thread, x eval.Value) {
+ v.aSet(t, x)
+}
+
+func (v remotePtr) aSet(a aborter, x eval.Value) {
+ if x == nil {
+ v.r.Set(a, v.r.p.PtrSize(), 0)
+ return
+ }
+ xr, ok := x.(remoteValue)
+ if !ok || v.r.p != xr.addr().p {
+ a.Abort(RemoteMismatchError("remote pointer must point within the same process"))
+ }
+ v.r.Set(a, v.r.p.PtrSize(), uint64(xr.addr().base))
+}
+
+func (v remotePtr) addr() remote { return v.r }
+
+/*
+ * Slice
+ */
+
+type remoteSlice struct {
+ r remote
+ elemType *remoteType
+}
+
+func (v remoteSlice) String() string {
+ return tryRVString(func(a aborter) string {
+ b := v.aGet(a).Base
+ if b == nil {
+ return "<nil>"
+ }
+ return b.String()
+ })
+}
+
+func (v remoteSlice) Assign(t *eval.Thread, o eval.Value) {
+ v.Set(t, o.(eval.SliceValue).Get(t))
+}
+
+func (v remoteSlice) Get(t *eval.Thread) eval.Slice {
+ return v.aGet(t)
+}
+
+func (v remoteSlice) aGet(a aborter) eval.Slice {
+ rs := v.r.p.runtime.Slice.mk(v.r).(remoteStruct)
+ base := proc.Word(rs.field(v.r.p.f.Slice.Array).(remoteUint).aGet(a))
+ nel := rs.field(v.r.p.f.Slice.Len).(remoteInt).aGet(a)
+ cap := rs.field(v.r.p.f.Slice.Cap).(remoteInt).aGet(a)
+ if base == 0 {
+ return eval.Slice{nil, nel, cap}
+ }
+ return eval.Slice{remoteArray{remote{base, v.r.p}, nel, v.elemType}, nel, cap}
+}
+
+func (v remoteSlice) Set(t *eval.Thread, x eval.Slice) {
+ v.aSet(t, x)
+}
+
+func (v remoteSlice) aSet(a aborter, x eval.Slice) {
+ rs := v.r.p.runtime.Slice.mk(v.r).(remoteStruct)
+ if x.Base == nil {
+ rs.field(v.r.p.f.Slice.Array).(remoteUint).aSet(a, 0)
+ } else {
+ ar, ok := x.Base.(remoteArray)
+ if !ok || v.r.p != ar.r.p {
+ a.Abort(RemoteMismatchError("remote slice must point within the same process"))
+ }
+ rs.field(v.r.p.f.Slice.Array).(remoteUint).aSet(a, uint64(ar.r.base))
+ }
+ rs.field(v.r.p.f.Slice.Len).(remoteInt).aSet(a, x.Len)
+ rs.field(v.r.p.f.Slice.Cap).(remoteInt).aSet(a, x.Cap)
+}
diff --git a/libgo/go/exp/ogle/vars.go b/libgo/go/exp/ogle/vars.go
new file mode 100644
index 0000000..8a3a147
--- /dev/null
+++ b/libgo/go/exp/ogle/vars.go
@@ -0,0 +1,272 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package ogle
+
+import (
+ "debug/gosym"
+ "debug/proc"
+ "exp/eval"
+ "log"
+ "os"
+)
+
+/*
+ * Remote frame pointers
+ */
+
+// A NotOnStack error occurs when attempting to access a variable in a
+// remote frame where that remote frame is not on the current stack.
+type NotOnStack struct {
+ Fn *gosym.Func
+ Goroutine *Goroutine
+}
+
+func (e NotOnStack) String() string {
+ return "function " + e.Fn.Name + " not on " + e.Goroutine.String() + "'s stack"
+}
+
+// A remoteFramePtr is an implementation of eval.PtrValue that
+// represents a pointer to a function frame in a remote process. When
+// accessed, this locates the function on the current goroutine's
+// stack and returns a structure containing the local variables of
+// that function.
+type remoteFramePtr struct {
+ p *Process
+ fn *gosym.Func
+ rt *remoteType
+}
+
+func (v remoteFramePtr) String() string {
+ // TODO(austin): This could be a really awesome string method
+ return "<remote frame>"
+}
+
+func (v remoteFramePtr) Assign(t *eval.Thread, o eval.Value) {
+ v.Set(t, o.(eval.PtrValue).Get(t))
+}
+
+func (v remoteFramePtr) Get(t *eval.Thread) eval.Value {
+ g := v.p.curGoroutine
+ if g == nil || g.frame == nil {
+ t.Abort(NoCurrentGoroutine{})
+ }
+
+ for f := g.frame; f != nil; f = f.aOuter(t) {
+ if f.fn != v.fn {
+ continue
+ }
+
+ // TODO(austin): Register for shootdown with f
+ return v.rt.mk(remote{f.fp, v.p})
+ }
+
+ t.Abort(NotOnStack{v.fn, g})
+ panic("fail")
+}
+
+func (v remoteFramePtr) Set(t *eval.Thread, x eval.Value) {
+ // Theoretically this could be a static error. If remote
+ // packages were packages, remote frames could just be defined
+ // as constants.
+ t.Abort(ReadOnlyError("remote frames cannot be assigned to"))
+}
+
+/*
+ * Remote packages
+ */
+
+// TODO(austin): Remote packages are implemented as structs right now,
+// which has some weird consequences. You can attempt to assign to a
+// remote package. It also produces terrible error messages.
+// Ideally, these would actually be packages, but somehow first-class
+// so they could be assigned to other names.
+
+// A remotePackage is an implementation of eval.StructValue that
+// represents a package in a remote process. It's essentially a
+// regular struct, except it cannot be assigned to.
+type remotePackage struct {
+ defs []eval.Value
+}
+
+func (v remotePackage) String() string { return "<remote package>" }
+
+func (v remotePackage) Assign(t *eval.Thread, o eval.Value) {
+ t.Abort(ReadOnlyError("remote packages cannot be assigned to"))
+}
+
+func (v remotePackage) Get(t *eval.Thread) eval.StructValue {
+ return v
+}
+
+func (v remotePackage) Field(t *eval.Thread, i int) eval.Value {
+ return v.defs[i]
+}
+
+/*
+ * Remote variables
+ */
+
+// populateWorld defines constants in the given world for each package
+// in this process. These packages are structs that, in turn, contain
+// fields for each global and function in that package.
+func (p *Process) populateWorld(w *eval.World) os.Error {
+ type def struct {
+ t eval.Type
+ v eval.Value
+ }
+ packages := make(map[string]map[string]def)
+
+ for _, s := range p.syms.Syms {
+ if s.ReceiverName() != "" {
+ // TODO(austin)
+ continue
+ }
+
+ // Package
+ pkgName := s.PackageName()
+ switch pkgName {
+ case "", "type", "extratype", "string", "go":
+ // "go" is really "go.string"
+ continue
+ }
+ pkg, ok := packages[pkgName]
+ if !ok {
+ pkg = make(map[string]def)
+ packages[pkgName] = pkg
+ }
+
+ // Symbol name
+ name := s.BaseName()
+ if _, ok := pkg[name]; ok {
+ log.Printf("Multiple definitions of symbol %s", s.Name)
+ continue
+ }
+
+ // Symbol type
+ rt, err := p.typeOfSym(&s)
+ if err != nil {
+ return err
+ }
+
+ // Definition
+ switch s.Type {
+ case 'D', 'd', 'B', 'b':
+ // Global variable
+ if rt == nil {
+ continue
+ }
+ pkg[name] = def{rt.Type, rt.mk(remote{proc.Word(s.Value), p})}
+
+ case 'T', 't', 'L', 'l':
+ // Function
+ s := s.Func
+ // TODO(austin): Ideally, this would *also* be
+ // callable. How does that interact with type
+ // conversion syntax?
+ rt, err := p.makeFrameType(s)
+ if err != nil {
+ return err
+ }
+ pkg[name] = def{eval.NewPtrType(rt.Type), remoteFramePtr{p, s, rt}}
+ }
+ }
+
+ // TODO(austin): Define remote types
+
+ // Define packages
+ for pkgName, defs := range packages {
+ fields := make([]eval.StructField, len(defs))
+ vals := make([]eval.Value, len(defs))
+ i := 0
+ for name, def := range defs {
+ fields[i].Name = name
+ fields[i].Type = def.t
+ vals[i] = def.v
+ i++
+ }
+ pkgType := eval.NewStructType(fields)
+ pkgVal := remotePackage{vals}
+
+ err := w.DefineConst(pkgName, pkgType, pkgVal)
+ if err != nil {
+ log.Printf("while defining package %s: %v", pkgName, err)
+ }
+ }
+
+ return nil
+}
+
+// typeOfSym returns the type associated with a symbol. If the symbol
+// has no type, returns nil.
+func (p *Process) typeOfSym(s *gosym.Sym) (*remoteType, os.Error) {
+ if s.GoType == 0 {
+ return nil, nil
+ }
+ addr := proc.Word(s.GoType)
+ var rt *remoteType
+ err := try(func(a aborter) { rt = parseRemoteType(a, p.runtime.Type.mk(remote{addr, p}).(remoteStruct)) })
+ if err != nil {
+ return nil, err
+ }
+ return rt, nil
+}
+
+// makeFrameType constructs a struct type for the frame of a function.
+// The offsets in this struct type are such that the struct can be
+// instantiated at this function's frame pointer.
+func (p *Process) makeFrameType(s *gosym.Func) (*remoteType, os.Error) {
+ n := len(s.Params) + len(s.Locals)
+ fields := make([]eval.StructField, n)
+ layout := make([]remoteStructField, n)
+ i := 0
+
+ // TODO(austin): There can be multiple locals/parameters with
+ // the same name. We probably need liveness information to do
+ // anything about this. Once we have that, perhaps we give
+ // such fields interface{} type? Or perhaps we disambiguate
+ // the names with numbers. Disambiguation is annoying for
+ // things like "i", where there's an obvious right answer.
+
+ for _, param := range s.Params {
+ rt, err := p.typeOfSym(param)
+ if err != nil {
+ return nil, err
+ }
+ if rt == nil {
+ //fmt.Printf(" (no type)\n");
+ continue
+ }
+ // TODO(austin): Why do local variables carry their
+ // package name?
+ fields[i].Name = param.BaseName()
+ fields[i].Type = rt.Type
+ // Parameters have positive offsets from FP
+ layout[i].offset = int(param.Value)
+ layout[i].fieldType = rt
+ i++
+ }
+
+ for _, local := range s.Locals {
+ rt, err := p.typeOfSym(local)
+ if err != nil {
+ return nil, err
+ }
+ if rt == nil {
+ continue
+ }
+ fields[i].Name = local.BaseName()
+ fields[i].Type = rt.Type
+ // Locals have negative offsets from FP - PtrSize
+ layout[i].offset = -int(local.Value) - p.PtrSize()
+ layout[i].fieldType = rt
+ i++
+ }
+
+ fields = fields[0:i]
+ layout = layout[0:i]
+ t := eval.NewStructType(fields)
+ mk := func(r remote) eval.Value { return remoteStruct{r, layout} }
+ return &remoteType{t, 0, 0, mk}, nil
+}
generated by cgit v1.1 at 2024-11-01 07:25:26 +0000