proctl

package
v0.0.0-...-cc5e0e2 Latest Latest
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 Go to latest Published: Feb 13, 2015 License: MIT Imports: 20 Imported by: 0

Documentation

Overview

Package proctl provides functions for attaching to and manipulating a process during the debug session.

Index

Constants

View Source 
const (
	STATUS_SLEEPING   = 'S'
	STATUS_RUNNING    = 'R'
	STATUS_TRACE_STOP = 't'
)

Variables

This section is empty.

Functions

func PtracePeekUser 

func PtracePeekUser(tid int, off uintptr) (uintptr, error)

func PtracePokeUser 

func PtracePokeUser(tid int, off, addr uintptr) error

Types

type BreakPoint 

type BreakPoint struct {
	FunctionName string
	File         string
	Line         int
	Addr         uint64
	OriginalData []byte
	ID           int
	// contains filtered or unexported fields
}

Represents a single breakpoint. Stores information on the break point including the byte of data that originally was stored at that address.

type BreakPointExistsError 

type BreakPointExistsError struct {
	// contains filtered or unexported fields
}

Returned when trying to set a breakpoint at an address that already has a breakpoint set for it.

func (BreakPointExistsError) Error 

func (bpe BreakPointExistsError) Error() string

type DebuggedProcess 

type DebuggedProcess struct {
	Pid           int
	Process       *os.Process
	Dwarf         *dwarf.Data
	GoSymTable    *gosym.Table
	FrameEntries  frame.FrameDescriptionEntries
	HWBreakPoints [4]*BreakPoint
	BreakPoints   map[uint64]*BreakPoint
	Threads       map[int]*ThreadContext
	CurrentThread *ThreadContext
	// contains filtered or unexported fields
}

Struct representing a debugged process. Holds onto pid, register values, process struct and process state.

func Attach 

func Attach(pid int) (*DebuggedProcess, error)

Attach to an existing process with the given PID.

func Launch 

func Launch(cmd []string) (*DebuggedProcess, error)

Create and begin debugging a new process. First entry in `cmd` is the program to run, and then rest are the arguments to be supplied to that process.

func (*DebuggedProcess) AttachThread 

func (dbp *DebuggedProcess) AttachThread(tid int) (*ThreadContext, error)

Attach to a newly created thread, and store that thread in our list of known threads.

func (*DebuggedProcess) Break 

func (dbp *DebuggedProcess) Break(addr uint64) (*BreakPoint, error)

Sets a breakpoint, adding it to our list of known breakpoints. Uses the "current thread" when setting the breakpoint.

func (*DebuggedProcess) BreakByLocation 

func (dbp *DebuggedProcess) BreakByLocation(loc string) (*BreakPoint, error)

Sets a breakpoint by location string (function, file+line, address)

func (*DebuggedProcess) BreakpointExists 

func (dbp *DebuggedProcess) BreakpointExists(addr uint64) bool

Returns whether or not a breakpoint has been set for the given address.

func (*DebuggedProcess) Clear 

func (dbp *DebuggedProcess) Clear(addr uint64) (*BreakPoint, error)

Clears a breakpoint in the current thread.

func (*DebuggedProcess) ClearByLocation 

func (dbp *DebuggedProcess) ClearByLocation(loc string) (*BreakPoint, error)

Clears a breakpoint by location (function, file+line, address, breakpoint id)

func (*DebuggedProcess) Continue 

func (dbp *DebuggedProcess) Continue() error

Resume process.

func (*DebuggedProcess) CurrentPC 

func (dbp *DebuggedProcess) CurrentPC() (uint64, error)

func (*DebuggedProcess) DwarfReader 

func (dbp *DebuggedProcess) DwarfReader() *reader.Reader

Returns a reader for the dwarf data

func (*DebuggedProcess) EvalSymbol 

func (dbp *DebuggedProcess) EvalSymbol(name string) (*Variable, error)

Returns the value of the named symbol.

func (*DebuggedProcess) FindLocation 

func (dbp *DebuggedProcess) FindLocation(str string) (uint64, error)

Find a location by string (file+line, function, breakpoint id, addr)

func (*DebuggedProcess) LoadInformation 

func (dbp *DebuggedProcess) LoadInformation() error

Finds the executable from /proc/<pid>/exe and then uses that to parse the following information: * Dwarf .debug_frame section * Dwarf .debug_line section * Go symbol table.

func (*DebuggedProcess) Next 

func (dbp *DebuggedProcess) Next() error

Step over function calls.

func (*DebuggedProcess) PrintGoroutinesInfo 

func (dbp *DebuggedProcess) PrintGoroutinesInfo() error

func (*DebuggedProcess) PrintThreadInfo 

func (dbp *DebuggedProcess) PrintThreadInfo() error

Loop through all threads, printing their information to the console.

func (*DebuggedProcess) Registers 

func (dbp *DebuggedProcess) Registers() (Registers, error)

Obtains register values from what Delve considers to be the current thread of the traced process.

func (*DebuggedProcess) RequestManualStop 

func (dbp *DebuggedProcess) RequestManualStop()

Sends out a request that the debugged process halt execution. Sends SIGSTOP to all threads.

func (*DebuggedProcess) Running 

func (dbp *DebuggedProcess) Running() bool

Returns whether or not Delve thinks the debugged process is currently executing.

func (*DebuggedProcess) Status 

func (dbp *DebuggedProcess) Status() *sys.WaitStatus

Returns the status of the current main thread context.

func (*DebuggedProcess) Step 

func (dbp *DebuggedProcess) Step() (err error)

Steps through process.

type InvalidAddressError 

type InvalidAddressError struct {
	// contains filtered or unexported fields
}

InvalidAddressError represents the result of attempting to set a breakpoint at an invalid address.

func (InvalidAddressError) Error 

func (iae InvalidAddressError) Error() string

type M 

type M struct {
	// contains filtered or unexported fields
}

type ManualStopError 

type ManualStopError struct{}

A ManualStopError happens when the user triggers a manual stop via SIGERM.

func (ManualStopError) Error 

func (mse ManualStopError) Error() string

type ProcessExitedError 

type ProcessExitedError struct {
	// contains filtered or unexported fields
}

func (ProcessExitedError) Error 

func (pe ProcessExitedError) Error() string

type Registers 

type Registers interface {
	PC() uint64
	SP() uint64
	SetPC(int, uint64) error
}

An interface for a generic register type. The interface encapsulates the generic values / actions we need independant of arch. The concrete register types will be different depending on OS/Arch.

type Regs 

type Regs struct {
	// contains filtered or unexported fields
}

func (*Regs) PC 

func (r *Regs) PC() uint64

func (*Regs) SP 

func (r *Regs) SP() uint64

func (*Regs) SetPC 

func (r *Regs) SetPC(tid int, pc uint64) error

type ThreadContext 

type ThreadContext struct {
	Id      int
	Process *DebuggedProcess
	Status  *sys.WaitStatus
}

ThreadContext represents a single thread in the traced process Id represents the thread id, Process holds a reference to the DebuggedProcess struct that contains info on the process as a whole, and Status represents the last result of a `wait` call on this thread.

func (*ThreadContext) AllM 

func (thread *ThreadContext) AllM() ([]*M, error)

Parses and returns select info on the internal M data structures used by the Go scheduler.

func (*ThreadContext) Break 

func (thread *ThreadContext) Break(addr uint64) (*BreakPoint, error)

Sets a breakpoint at addr, and stores it in the process wide break point table. Setting a break point must be thread specific due to ptrace actions needing the thread to be in a signal-delivery-stop.

Depending on hardware support, Delve will choose to either set a hardware or software breakpoint. Essentially, if the hardware supports it, and there are free debug registers, Delve will set a hardware breakpoint. Otherwise we fall back to software breakpoints, which are a bit more work for us.

func (*ThreadContext) Clear 

func (thread *ThreadContext) Clear(addr uint64) (*BreakPoint, error)

Clears a breakpoint, and removes it from the process level break point table.

func (*ThreadContext) Continue 

func (thread *ThreadContext) Continue() error

Continue the execution of this thread. This method takes software breakpoints into consideration and ensures that we step over any breakpoints. It will restore the instruction, step, and then restore the breakpoint and continue.

func (*ThreadContext) CurrentPC 

func (thread *ThreadContext) CurrentPC() (uint64, error)

Returns the current PC for this thread.

func (*ThreadContext) EvalSymbol 

func (thread *ThreadContext) EvalSymbol(name string) (*Variable, error)

Returns the value of the named symbol.

func (*ThreadContext) FunctionArguments 

func (thread *ThreadContext) FunctionArguments() ([]*Variable, error)

FunctionArguments returns the name, value, and type of all current function arguments.

func (*ThreadContext) LocalVariables 

func (thread *ThreadContext) LocalVariables() ([]*Variable, error)

LocalVariables returns all local variables from the current function scope.

func (*ThreadContext) Next 

func (thread *ThreadContext) Next() (err error)

Step to next source line. Next will step over functions, and will follow through to the return address of a function. Next is implemented on the thread context, however during the course of this function running, it's very likely that the goroutine our M is executing will switch to another M, therefore this function cannot assume all execution will happen on this thread in the traced process.

func (*ThreadContext) PackageVariables 

func (thread *ThreadContext) PackageVariables() ([]*Variable, error)

PackageVariables returns the name, value, and type of all package variables in the application.

func (*ThreadContext) PrintInfo 

func (thread *ThreadContext) PrintInfo() error

PrintInfo prints out the thread status including: PC, tid, file, line, and function.

func (*ThreadContext) Registers 

func (thread *ThreadContext) Registers() (Registers, error)

Obtains register values from the debugged process.

func (*ThreadContext) ReturnAddressFromOffset 

func (thread *ThreadContext) ReturnAddressFromOffset(offset int64) uint64

Takes an offset from RSP and returns the address of the instruction the currect function is going to return to.

func (*ThreadContext) Step 

func (thread *ThreadContext) Step() (err error)

Single steps this thread a single instruction, ensuring that we correctly handle the likely case that we are at a breakpoint.

type Variable 

type Variable struct {
	Name  string
	Value string
	Type  string
}

Source Files

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