forked from go-delve/delve
/
threads.go
168 lines (148 loc) · 4.4 KB
/
threads.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
package native
import (
"errors"
"fmt"
"github.com/derekparker/delve/pkg/proc"
)
// Thread represents a single thread in the traced process
// ID represents the thread id or port, Process holds a reference to the
// Process struct that contains info on the process as
// a whole, and Status represents the last result of a `wait` call
// on this thread.
type Thread struct {
ID int // Thread ID or mach port
Status *WaitStatus // Status returned from last wait call
CurrentBreakpoint proc.BreakpointState // Breakpoint thread is currently stopped at
dbp *Process
singleStepping bool
os *OSSpecificDetails
common proc.CommonThread
}
// Continue the execution of this thread.
//
// If we are currently at a breakpoint, we'll clear it
// first and then resume execution. Thread will continue until
// it hits a breakpoint or is signaled.
func (thread *Thread) Continue() error {
pc, err := thread.PC()
if err != nil {
return err
}
// Check whether we are stopped at a breakpoint, and
// if so, single step over it before continuing.
if _, ok := thread.dbp.FindBreakpoint(pc); ok {
if err := thread.StepInstruction(); err != nil {
return err
}
}
return thread.resume()
}
// StepInstruction steps a single instruction.
//
// Executes exactly one instruction and then returns.
// If the thread is at a breakpoint, we first clear it,
// execute the instruction, and then replace the breakpoint.
// Otherwise we simply execute the next instruction.
func (thread *Thread) StepInstruction() (err error) {
thread.singleStepping = true
defer func() {
thread.singleStepping = false
}()
pc, err := thread.PC()
if err != nil {
return err
}
bp, ok := thread.dbp.FindBreakpoint(pc)
if ok {
// Clear the breakpoint so that we can continue execution.
err = thread.ClearBreakpoint(bp)
if err != nil {
return err
}
// Restore breakpoint now that we have passed it.
defer func() {
err = thread.dbp.writeSoftwareBreakpoint(thread, bp.Addr)
}()
}
err = thread.singleStep()
if err != nil {
if _, exited := err.(proc.ProcessExitedError); exited {
return err
}
return fmt.Errorf("step failed: %s", err.Error())
}
return nil
}
// Location returns the threads location, including the file:line
// of the corresponding source code, the function we're in
// and the current instruction address.
func (thread *Thread) Location() (*proc.Location, error) {
pc, err := thread.PC()
if err != nil {
return nil, err
}
f, l, fn := thread.dbp.bi.PCToLine(pc)
return &proc.Location{PC: pc, File: f, Line: l, Fn: fn}, nil
}
func (thread *Thread) Arch() proc.Arch {
return thread.dbp.bi.Arch
}
func (thread *Thread) BinInfo() *proc.BinaryInfo {
return &thread.dbp.bi
}
func (thread *Thread) Common() *proc.CommonThread {
return &thread.common
}
// SetCurrentBreakpoint sets the current breakpoint that this
// thread is stopped at as CurrentBreakpoint on the thread struct.
func (thread *Thread) SetCurrentBreakpoint() error {
thread.CurrentBreakpoint.Clear()
pc, err := thread.PC()
if err != nil {
return err
}
if bp, ok := thread.dbp.FindBreakpoint(pc); ok {
if err = thread.SetPC(bp.Addr); err != nil {
return err
}
thread.CurrentBreakpoint = bp.CheckCondition(thread)
if thread.CurrentBreakpoint.Breakpoint != nil && thread.CurrentBreakpoint.Active {
if g, err := proc.GetG(thread); err == nil {
thread.CurrentBreakpoint.HitCount[g.ID]++
}
thread.CurrentBreakpoint.TotalHitCount++
}
}
return nil
}
func (th *Thread) Breakpoint() proc.BreakpointState {
return th.CurrentBreakpoint
}
func (th *Thread) ThreadID() int {
return th.ID
}
// ClearBreakpoint clears the specified breakpoint.
func (thread *Thread) ClearBreakpoint(bp *proc.Breakpoint) error {
if _, err := thread.WriteMemory(uintptr(bp.Addr), bp.OriginalData); err != nil {
return fmt.Errorf("could not clear breakpoint %s", err)
}
return nil
}
// Registers obtains register values from the debugged process.
func (t *Thread) Registers(floatingPoint bool) (proc.Registers, error) {
return registers(t, floatingPoint)
}
func (t *Thread) RestoreRegisters(savedRegs proc.SavedRegisters) error {
sr, ok := savedRegs.(*savedRegisters)
if !ok {
return errors.New("unknown saved register set")
}
return t.restoreRegisters(sr)
}
func (t *Thread) PC() (uint64, error) {
regs, err := t.Registers(false)
if err != nil {
return 0, err
}
return regs.PC(), nil
}