proc

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Published: Jan 11, 2017 License: MIT Imports: 32 Imported by: 0

Documentation

Overview

Package proc is a low-level package that provides methods to manipulate the process we are debugging.

proc implements all core functionality including: * creating / attaching to a process * process manipulation (step, next, continue, halt) * methods to explore the memory of the process

Index

Constants

View Source
const (
	GNUFlavour = AssemblyFlavour(iota)
	IntelFlavour
)
View Source
const (
	StatusSleeping  = 'S'
	StatusRunning   = 'R'
	StatusTraceStop = 't'
	StatusZombie    = 'Z'

	// Kernel 2.6 has TraceStop as T
	// TODO(derekparker) Since this means something different based on the
	// version of the kernel ('T' is job control stop on modern 3.x+ kernels) we
	// may want to differentiate at some point.
	StatusTraceStopT = 'T'
)

Process statuses

View Source
const (
	Gidle           uint64 = iota // 0
	Grunnable                     // 1 runnable and on a run queue
	Grunning                      // 2
	Gsyscall                      // 3
	Gwaiting                      // 4
	GmoribundUnused               // 5 currently unused, but hardcoded in gdb scripts
	Gdead                         // 6
	Genqueue                      // 7 Only the Gscanenqueue is used.
	Gcopystack                    // 8 in this state when newstack is moving the stack
)

G status, from: src/runtime/runtime2.go

Variables

View Source
var NotExecutableErr = errors.New("not an executable file")
View Source
var UnknownRegisterError = errors.New("unknown register")
View Source
var UnsupportedArchErr = errors.New("unsupported architecture - only linux/amd64 is supported")

Functions

func PtraceAttach

func PtraceAttach(pid int) error

PtraceAttach executes the sys.PtraceAttach call.

func PtraceCont

func PtraceCont(tid, sig int) error

PtraceCont executes ptrace PTRACE_CONT

func PtraceDetach

func PtraceDetach(tid, sig int) error

PtraceDetach calls ptrace(PTRACE_DETACH).

func PtracePeekUser

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

PtracePeekUser execute ptrace PTRACE_PEEK_USER.

func PtracePokeUser

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

PtracePokeUser execute ptrace PTRACE_POKE_USER.

func PtraceSingleStep

func PtraceSingleStep(tid int) error

PtraceSingleStep executes ptrace PTRACE_SINGLE_STEP.

Types

type AMD64

type AMD64 struct {
	// contains filtered or unexported fields
}

AMD64 represents the AMD64 CPU architecture.

func AMD64Arch

func AMD64Arch() *AMD64

AMD64Arch returns an initialized AMD64 struct.

func (*AMD64) BreakpointInstruction

func (a *AMD64) BreakpointInstruction() []byte

BreakpointInstruction returns the Breakpoint instruction for this architecture.

func (*AMD64) BreakpointSize

func (a *AMD64) BreakpointSize() int

BreakpointSize returns the size of the breakpoint instruction on this architecture.

func (*AMD64) GStructOffset

func (a *AMD64) GStructOffset() uint64

GStructOffset returns the offset of the G struct in thread local storage.

func (*AMD64) PtrSize

func (a *AMD64) PtrSize() int

PtrSize returns the size of a pointer on this architecture.

func (*AMD64) SetGStructOffset

func (a *AMD64) SetGStructOffset(ver GoVersion, isextld bool)

SetGStructOffset sets the offset of the G struct on the AMD64 arch struct. The offset is dependent on the Go compiler Version and whether or not the target program was externally linked.

type Arch

type Arch interface {
	SetGStructOffset(ver GoVersion, iscgo bool)
	PtrSize() int
	BreakpointInstruction() []byte
	BreakpointSize() int
	GStructOffset() uint64
}

Arch defines an interface for representing a CPU architecture.

type ArchInst

type ArchInst x86asm.Inst

func (*ArchInst) Size

func (inst *ArchInst) Size() int

type AsmInstruction

type AsmInstruction struct {
	Loc        Location
	DestLoc    *Location
	Bytes      []byte
	Breakpoint bool
	AtPC       bool
	Inst       *ArchInst
}

func (*AsmInstruction) IsCall

func (inst *AsmInstruction) IsCall() bool

func (*AsmInstruction) Text

func (inst *AsmInstruction) Text(flavour AssemblyFlavour) string

type AssemblyFlavour

type AssemblyFlavour int

type Breakpoint

type Breakpoint struct {
	// File & line information for printing.
	FunctionName string
	File         string
	Line         int

	Addr         uint64         // Address breakpoint is set for.
	OriginalData []byte         // If software breakpoint, the data we replace with breakpoint instruction.
	Name         string         // User defined name of the breakpoint
	ID           int            // Monotonically increasing ID.
	Kind         BreakpointKind // Whether this is an internal breakpoint (for next'ing or stepping).

	// Breakpoint information
	Tracepoint    bool     // Tracepoint flag
	Goroutine     bool     // Retrieve goroutine information
	Stacktrace    int      // Number of stack frames to retrieve
	Variables     []string // Variables to evaluate
	LoadArgs      *LoadConfig
	LoadLocals    *LoadConfig
	HitCount      map[int]uint64 // Number of times a breakpoint has been reached in a certain goroutine
	TotalHitCount uint64         // Number of times a breakpoint has been reached

	// DeferReturns: when kind == NextDeferBreakpoint this breakpoint
	// will also check if the caller is runtime.gopanic or if the return
	// address is in the DeferReturns array.
	// Next uses NextDeferBreakpoints for the breakpoint it sets on the
	// deferred function, DeferReturns is populated with the
	// addresses of calls to runtime.deferreturn in the current
	// function. This insures that the breakpoint on the deferred
	// function only triggers on panic or on the defer call to
	// the function, not when the function is called directly
	DeferReturns []uint64
	// Cond: if not nil the breakpoint will be triggered only if evaluating Cond returns true
	Cond ast.Expr
}

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

func (*Breakpoint) Clear

func (bp *Breakpoint) Clear(thread *Thread) (*Breakpoint, error)

Clear this breakpoint appropriately depending on whether it is a hardware or software breakpoint.

func (*Breakpoint) Internal

func (bp *Breakpoint) Internal() bool

Internal returns true for breakpoints not set directly by the user.

func (*Breakpoint) String

func (bp *Breakpoint) String() string

type BreakpointExistsError

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

BreakpointExistsError is 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 BreakpointKind

type BreakpointKind int

Breakpoint Kind determines the behavior of delve when the breakpoint is reached.

const (
	// UserBreakpoint is a user set breakpoint
	UserBreakpoint BreakpointKind = iota
	// NextBreakpoint is a breakpoint set by Next, Continue
	// will stop on it and delete it
	NextBreakpoint
	// NextDeferBreakpoint is a breakpoint set by Next on the
	// first deferred function. In addition to checking their condition
	// breakpoints of this kind will also check that the function has been
	// called by runtime.gopanic or through runtime.deferreturn.
	NextDeferBreakpoint
	// StepBreakpoint is a breakpoint set by Step on a CALL instruction,
	// Continue will set a new breakpoint (of NextBreakpoint kind) on the
	// destination of CALL, delete this breakpoint and then continue again
	StepBreakpoint
)

type EvalScope

type EvalScope struct {
	Thread *Thread
	PC     uint64
	CFA    int64
}

EvalScope is the scope for variable evaluation. Contains the thread, current location (PC), and canonical frame address.

func (*EvalScope) DwarfReader

func (scope *EvalScope) DwarfReader() *reader.Reader

DwarfReader returns the DwarfReader containing the Dwarf information for the target process.

func (*EvalScope) EvalExpression

func (scope *EvalScope) EvalExpression(expr string, cfg LoadConfig) (*Variable, error)

EvalExpression returns the value of the given expression.

func (*EvalScope) EvalVariable

func (scope *EvalScope) EvalVariable(name string, cfg LoadConfig) (*Variable, error)

EvalVariable returns the value of the given expression (backwards compatibility).

func (*EvalScope) FunctionArguments

func (scope *EvalScope) FunctionArguments(cfg LoadConfig) ([]*Variable, error)

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

func (*EvalScope) LocalVariables

func (scope *EvalScope) LocalVariables(cfg LoadConfig) ([]*Variable, error)

LocalVariables returns all local variables from the current function scope.

func (*EvalScope) PackageVariables

func (scope *EvalScope) PackageVariables(cfg LoadConfig) ([]*Variable, error)

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

func (*EvalScope) PtrSize

func (scope *EvalScope) PtrSize() int

PtrSize returns the size of a pointer.

func (*EvalScope) SetVariable

func (scope *EvalScope) SetVariable(name, value string) error

SetVariable sets the value of the named variable

func (*EvalScope) Type

func (scope *EvalScope) Type(offset dwarf.Offset) (dwarf.Type, error)

Type returns the Dwarf type entry at `offset`.

type G

type G struct {
	ID         int    // Goroutine ID
	PC         uint64 // PC of goroutine when it was parked.
	SP         uint64 // SP of goroutine when it was parked.
	GoPC       uint64 // PC of 'go' statement that created this goroutine.
	WaitReason string // Reason for goroutine being parked.
	Status     uint64

	// Information on goroutine location
	CurrentLoc Location

	// PC of entry to top-most deferred function.
	DeferPC uint64
	// contains filtered or unexported fields
}

G represents a runtime G (goroutine) structure (at least the fields that Delve is interested in).

func (*G) ChanRecvBlocked

func (g *G) ChanRecvBlocked() bool

ChanRecvBlocked returns whether the goroutine is blocked on a channel read operation.

func (*G) Go

func (g *G) Go() Location

Go returns the location of the 'go' statement that spawned this goroutine.

func (*G) Stacktrace

func (g *G) Stacktrace(depth int) ([]Stackframe, error)

Stacktrace returns the stack trace for a goroutine. Note the locations in the array are return addresses not call addresses.

func (*G) Thread

func (g *G) Thread() *Thread

func (*G) UserCurrent

func (g *G) UserCurrent() Location

UserCurrent returns the location the users code is at, or was at before entering a runtime function.

type GoVersion

type GoVersion struct {
	Major int
	Minor int
	Rev   int
	Beta  int
	RC    int
}

GoVersion represents the Go version of the Go compiler version used to compile the target binary.

func ParseVersionString

func ParseVersionString(ver string) (GoVersion, bool)

func (*GoVersion) AfterOrEqual

func (v *GoVersion) AfterOrEqual(b GoVersion) bool

AfterOrEqual returns whether one GoVersion is after or equal to the other.

func (*GoVersion) IsDevel

func (v *GoVersion) IsDevel() bool

IsDevel returns whether the GoVersion is a development version.

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 IsNilErr

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

IsNilErr is returned when a variable is nil.

func (*IsNilErr) Error

func (err *IsNilErr) Error() string

type LoadConfig

type LoadConfig struct {
	// FollowPointers requests pointers to be automatically dereferenced.
	FollowPointers bool
	// MaxVariableRecurse is how far to recurse when evaluating nested types.
	MaxVariableRecurse int
	// MaxStringLen is the maximum number of bytes read from a string
	MaxStringLen int
	// MaxArrayValues is the maximum number of elements read from an array, a slice or a map.
	MaxArrayValues int
	// MaxStructFields is the maximum number of fields read from a struct, -1 will read all fields.
	MaxStructFields int
}

type Location

type Location struct {
	PC   uint64
	File string
	Line int
	Fn   *gosym.Func
}

Location represents the location of a thread. Holds information on the current instruction address, the source file:line, and the function.

type M

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

M represents a runtime M (OS thread) structure.

type NoBreakpointError

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

NoBreakpointError is returned when trying to clear a breakpoint that does not exist.

func (NoBreakpointError) Error

func (nbp NoBreakpointError) Error() string

type NoGError

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

NoGError returned when a G could not be found for a specific thread.

func (NoGError) Error

func (ng NoGError) Error() string

type NoReturnAddr

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

NoReturnAddr is returned when return address could not be found during stack trace.

func (NoReturnAddr) Error

func (nra NoReturnAddr) Error() string

type NullAddrError

type NullAddrError struct{}

NullAddrError is an error for a null address.

func (NullAddrError) Error

func (n NullAddrError) Error() string

type OSProcessDetails

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

OSProcessDetails contains Linux specific process details.

type OSSpecificDetails

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

OSSpecificDetails hold Linux specific process details.

type Process

type Process struct {
	Pid          int         // Process Pid
	Process      *os.Process // Pointer to process struct for the actual process we are debugging
	LastModified time.Time   // Time the executable of this process was last modified

	// Breakpoint table, holds information on breakpoints.
	// Maps instruction address to Breakpoint struct.
	Breakpoints map[uint64]*Breakpoint

	// List of threads mapped as such: pid -> *Thread
	Threads map[int]*Thread

	// Active thread
	CurrentThread *Thread

	// Goroutine that will be used by default to set breakpoint, eval variables, etc...
	// Normally SelectedGoroutine is CurrentThread.GetG, it will not be only if SwitchGoroutine is called with a goroutine that isn't attached to a thread
	SelectedGoroutine *G
	// contains filtered or unexported fields
}

Process represents all of the information the debugger is holding onto regarding the process we are debugging.

func Attach

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

Attach to an existing process with the given PID.

func Launch

func Launch(cmd []string, wd string) (*Process, error)

Launch creates and begins 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. `wd` is working directory of the program.

func New

func New(pid int) *Process

New returns an initialized Process struct. Before returning, it will also launch a goroutine in order to handle ptrace(2) functions. For more information, see the documentation on `handlePtraceFuncs`.

func (*Process) ClearBreakpoint

func (dbp *Process) ClearBreakpoint(addr uint64) (*Breakpoint, error)

ClearBreakpoint clears the breakpoint at addr.

func (*Process) ClearInternalBreakpoints

func (dbp *Process) ClearInternalBreakpoints() error

func (*Process) Continue

func (dbp *Process) Continue() error

Continue continues execution of the debugged process. It will continue until it hits a breakpoint or is otherwise stopped.

func (*Process) ConvertEvalScope

func (dbp *Process) ConvertEvalScope(gid, frame int) (*EvalScope, error)

ConvertEvalScope returns a new EvalScope in the context of the specified goroutine ID and stack frame.

func (*Process) CurrentBreakpoint

func (dbp *Process) CurrentBreakpoint() *Breakpoint

CurrentBreakpoint returns the breakpoint the current thread is stopped at.

func (*Process) CurrentLocation

func (dbp *Process) CurrentLocation() (*Location, error)

CurrentLocation returns the location of the current thread.

func (*Process) Detach

func (dbp *Process) Detach(kill bool) (err error)

Detach from the process being debugged, optionally killing it.

func (*Process) DwarfReader

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

DwarfReader returns a reader for the dwarf data

func (*Process) EvalPackageVariable

func (dbp *Process) EvalPackageVariable(name string, cfg LoadConfig) (*Variable, error)

EvalPackageVariable will evaluate the package level variable specified by 'name'.

func (*Process) Exited

func (dbp *Process) Exited() bool

Exited returns whether the debugged process has exited.

func (*Process) FindBreakpoint

func (dbp *Process) FindBreakpoint(pc uint64) (*Breakpoint, bool)

FindBreakpoint finds the breakpoint for the given pc.

func (*Process) FindBreakpointByID

func (dbp *Process) FindBreakpointByID(id int) (*Breakpoint, bool)

FindBreakpointByID finds the breakpoint for the given ID.

func (*Process) FindFileLocation

func (dbp *Process) FindFileLocation(fileName string, lineno int) (uint64, error)

FindFileLocation returns the PC for a given file:line. Assumes that `file` is normailzed to lower case and '/' on Windows.

func (*Process) FindFunctionLocation

func (dbp *Process) FindFunctionLocation(funcName string, firstLine bool, lineOffset int) (uint64, error)

FindFunctionLocation finds address of a function's line If firstLine == true is passed FindFunctionLocation will attempt to find the first line of the function If lineOffset is passed FindFunctionLocation will return the address of that line Pass lineOffset == 0 and firstLine == false if you want the address for the function's entry point Note that setting breakpoints at that address will cause surprising behavior: https://github.com/derekparker/delve/issues/170

func (*Process) FindGoroutine

func (dbp *Process) FindGoroutine(gid int) (*G, error)

FindGoroutine returns a G struct representing the goroutine specified by `gid`.

func (*Process) FirstPCAfterPrologue

func (dbp *Process) FirstPCAfterPrologue(fn *gosym.Func, sameline bool) (uint64, error)

FirstPCAfterPrologue returns the address of the first instruction after the prologue for function fn If sameline is set FirstPCAfterPrologue will always return an address associated with the same line as fn.Entry

func (*Process) Funcs

func (dbp *Process) Funcs() []gosym.Func

Funcs returns list of functions present in the debugged program.

func (*Process) GoroutineLocation

func (dbp *Process) GoroutineLocation(g *G) *Location

GoroutineLocation returns the location of the given goroutine.

func (*Process) GoroutinesInfo

func (dbp *Process) GoroutinesInfo() ([]*G, error)

GoroutinesInfo returns an array of G structures representing the information Delve cares about from the internal runtime G structure.

func (*Process) Halt

func (dbp *Process) Halt() (err error)

Halt stops all threads.

func (*Process) Kill

func (dbp *Process) Kill() (err error)

Kill kills the target process.

func (*Process) LoadInformation

func (dbp *Process) LoadInformation(path string) error

LoadInformation finds the executable and then uses it to parse the following information: * Dwarf .debug_frame section * Dwarf .debug_line section * Go symbol table.

func (*Process) Next

func (dbp *Process) Next() (err error)

Next continues execution until the next source line.

func (*Process) PC

func (dbp *Process) PC() (uint64, error)

PC returns the PC of the current thread.

func (*Process) PCToLine

func (dbp *Process) PCToLine(pc uint64) (string, int, *gosym.Func)

PCToLine converts an instruction address to a file/line/function.

func (*Process) Registers

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

Registers obtains register values from the "current" thread of the traced process.

func (*Process) RequestManualStop

func (dbp *Process) RequestManualStop() error

RequestManualStop sets the `halt` flag and sends SIGSTOP to all threads.

func (*Process) Running

func (dbp *Process) Running() bool

Running returns whether the debugged process is currently executing.

func (*Process) SetBreakpoint

func (dbp *Process) SetBreakpoint(addr uint64, kind BreakpointKind, cond ast.Expr) (*Breakpoint, error)

SetBreakpoint 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.

func (*Process) Sources

func (dbp *Process) Sources() map[string]*gosym.Obj

Sources returns list of source files that comprise the debugged binary.

func (*Process) Status

func (dbp *Process) Status() *WaitStatus

Status returns the status of the current main thread context.

func (*Process) Step

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

Step will continue until another source line is reached. Will step into functions.

func (*Process) StepInstruction

func (dbp *Process) StepInstruction() (err error)

StepInstruction will continue the current thread for exactly one instruction. This method affects only the thread asssociated with the selected goroutine. All other threads will remain stopped.

func (*Process) StepOut

func (dbp *Process) StepOut() error

StepOut will continue until the current goroutine exits the function currently being executed or a deferred function is executed

func (*Process) SwitchGoroutine

func (dbp *Process) SwitchGoroutine(gid int) error

SwitchGoroutine changes from current thread to the thread running the specified goroutine.

func (*Process) SwitchThread

func (dbp *Process) SwitchThread(tid int) error

SwitchThread changes from current thread to the thread specified by `tid`.

func (*Process) Types

func (dbp *Process) Types() ([]string, error)

Types returns list of types present in the debugged program.

type ProcessExitedError

type ProcessExitedError struct {
	Pid    int
	Status int
}

ProcessExitedError indicates that the process has exited and contains both process id and exit status.

func (ProcessExitedError) Error

func (pe ProcessExitedError) Error() string

type PtraceFpRegs

type PtraceFpRegs struct {
	Cwd      uint16
	Swd      uint16
	Ftw      uint16
	Fop      uint16
	Rip      uint64
	Rdp      uint64
	Mxcsr    uint32
	MxcrMask uint32
	StSpace  [32]uint32
	XmmSpace [256]byte
	// contains filtered or unexported fields
}

tracks user_fpregs_struct in /usr/include/x86_64-linux-gnu/sys/user.h

type PtraceXsave

type PtraceXsave struct {
	PtraceFpRegs
	AvxState bool // contains AVX state
	YmmSpace [256]byte
}

func PtraceGetRegset

func PtraceGetRegset(tid int) (regset PtraceXsave, err error)

PtraceGetRegset returns floating point registers of the specified thread using PTRACE. See amd64_linux_fetch_inferior_registers in gdb/amd64-linux-nat.c.html and amd64_supply_xsave in gdb/amd64-tdep.c.html and Section 13.1 (and following) of Intel® 64 and IA-32 Architectures Software Developer’s Manual, Volume 1: Basic Architecture

type Register

type Register struct {
	Name  string
	Value string
}

type Registers

type Registers interface {
	PC() uint64
	SP() uint64
	CX() uint64
	TLS() uint64
	Get(int) (uint64, error)
	SetPC(*Thread, uint64) error
	Slice() []Register
}

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

type Regs

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

Regs is a wrapper for sys.PtraceRegs.

func (*Regs) CX

func (r *Regs) CX() uint64

CX returns the value of RCX register.

func (*Regs) Get

func (r *Regs) Get(n int) (uint64, error)

func (*Regs) PC

func (r *Regs) PC() uint64

PC returns the value of RIP register.

func (*Regs) SP

func (r *Regs) SP() uint64

SP returns the value of RSP register.

func (*Regs) SetPC

func (r *Regs) SetPC(thread *Thread, pc uint64) (err error)

SetPC sets RIP to the value specified by 'pc'.

func (*Regs) Slice

func (r *Regs) Slice() []Register

func (*Regs) TLS

func (r *Regs) TLS() uint64

TLS returns the address of the thread local storage memory segment.

type Stackframe

type Stackframe struct {
	// Address the function above this one on the call stack will return to.
	Current Location
	// Address of the call instruction for the function above on the call stack.
	Call Location
	// Start address of the stack frame.
	CFA int64
	// Description of the stack frame.
	FDE *frame.FrameDescriptionEntry
	// Return address for this stack frame (as read from the stack frame itself).
	Ret uint64
}

Stackframe represents a frame in a system stack.

func (*Stackframe) Scope

func (frame *Stackframe) Scope(thread *Thread) *EvalScope

Scope returns a new EvalScope using this frame.

type Thread

type Thread struct {
	ID                       int         // Thread ID or mach port
	Status                   *WaitStatus // Status returned from last wait call
	CurrentBreakpoint        *Breakpoint // Breakpoint thread is currently stopped at
	BreakpointConditionMet   bool        // Output of evaluating the breakpoint's condition
	BreakpointConditionError error       // Error evaluating the breakpoint's condition
	// contains filtered or unexported fields
}

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.

func (*Thread) Continue

func (thread *Thread) Continue() error

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) Disassemble

func (thread *Thread) Disassemble(startPC, endPC uint64, currentGoroutine bool) ([]AsmInstruction, error)

Disassemble disassembles target memory between startPC and endPC If currentGoroutine is set and thread is stopped at a CALL instruction Disassemble will evaluate the argument of the CALL instruction using the thread's registers Be aware that the Bytes field of each returned instruction is a slice of a larger array of size endPC - startPC

func (*Thread) GetG

func (thread *Thread) GetG() (g *G, err error)

GetG returns information on the G (goroutine) that is executing on this thread.

The G structure for a thread is stored in thread local storage. Here we simply calculate the address and read and parse the G struct.

We cannot simply use the allg linked list in order to find the M that represents the given OS thread and follow its G pointer because on Darwin mach ports are not universal, so our port for this thread would not map to the `id` attribute of the M structure. Also, when linked against libc, Go prefers the libc version of clone as opposed to the runtime version. This has the consequence of not setting M.id for any thread, regardless of OS.

In order to get around all this craziness, we read the address of the G structure for the current thread from the thread local storage area.

func (*Thread) Halt

func (thread *Thread) Halt() (err error)

Halt stops this thread from executing. Actual implementation is OS dependant. Look in OS thread file.

func (*Thread) Location

func (thread *Thread) Location() (*Location, error)

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) PC

func (t *Thread) PC() (uint64, error)

PC returns the current PC for this thread.

func (*Thread) Registers

func (t *Thread) Registers(floatingPoint bool) (Registers, error)

Registers obtains register values from the debugged process.

func (*Thread) ReturnAddress

func (t *Thread) ReturnAddress() (uint64, error)

ReturnAddress returns the return address of the function this thread is executing.

func (*Thread) Scope

func (thread *Thread) Scope() (*EvalScope, error)

Scope returns the current EvalScope for this thread.

func (*Thread) SetCurrentBreakpoint

func (thread *Thread) SetCurrentBreakpoint() error

SetCurrentBreakpoint sets the current breakpoint that this thread is stopped at as CurrentBreakpoint on the thread struct.

func (*Thread) SetPC

func (thread *Thread) SetPC(pc uint64) error

SetPC sets the PC for this thread.

func (*Thread) Stacktrace

func (t *Thread) Stacktrace(depth int) ([]Stackframe, error)

Stacktrace returns the stack trace for thread. Note the locations in the array are return addresses not call addresses.

func (*Thread) StepInstruction

func (thread *Thread) StepInstruction() (err error)

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) Stopped

func (thread *Thread) Stopped() bool

Stopped returns whether the thread is stopped at the operating system level. Actual implementation is OS dependant, look in OS thread file.

type ThreadBlockedError

type ThreadBlockedError struct{}

ThreadBlockedError is returned when the thread is blocked in the scheduler.

func (ThreadBlockedError) Error

func (tbe ThreadBlockedError) Error() string

type Variable

type Variable struct {
	Addr      uintptr
	OnlyAddr  bool
	Name      string
	DwarfType dwarf.Type
	RealType  dwarf.Type
	Kind      reflect.Kind

	Value constant.Value

	Len int64
	Cap int64

	// Base address of arrays, Base address of the backing array for slices (0 for nil slices)
	// Base address of the backing byte array for strings
	// address of the struct backing chan and map variables
	// address of the function entry point for function variables (0 for nil function pointers)
	Base uintptr

	Children []Variable

	Unreadable error
	// contains filtered or unexported fields
}

Variable represents a variable. It contains the address, name, type and other information parsed from both the Dwarf information and the memory of the debugged process. If OnlyAddr is true, the variables value has not been loaded.

func (*Variable) TypeString

func (v *Variable) TypeString() string

TypeString returns the string representation of the type of this variable.

type WaitStatus

type WaitStatus sys.WaitStatus

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