obtained gcc-4.6.4.tar.bz2 from upstream website;upstream

verified gcc-4.6.4.tar.bz2.sig;
imported gcc-4.6.4 source tree from verified upstream tarball.

downloading a git-generated archive based on the 'upstream' tag
should provide you with a source tree that is binary identical
to the one extracted from the above tarball.

if you have obtained the source via the command 'git clone',
however, do note that line-endings of files in your working
directory might differ from line-endings of the respective
files in the upstream repository.

1 files changed, 521 insertions, 0 deletions

diff --git a/libgo/go/exp/ogle/process.go b/libgo/go/exp/ogle/process.go
new file mode 100644
index 000000000..58e830aa6
--- /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()
+}