mirror of
https://github.com/golang/go
synced 2024-11-13 19:00:25 -07:00
ffe83e582e
debug/proc to install to the right place. Delete the old ptrace package. The diff looks huge, but it's mostly s/ptrace/proc/. R=rsc APPROVED=rsc DELTA=1940 (10 added, 1835 deleted, 95 changed) OCL=34966 CL=34968
580 lines
12 KiB
Go
580 lines
12 KiB
Go
// 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";
|
|
"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 ", v.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.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);
|
|
}
|