60c58acb8e
Displays the return values of the current function when we step out of it after executing a step, next or stepout command. Implementation of this feature is tricky: when the function has returned the return variables are not in scope anymore. Implementing this feature requires evaluating variables that are out of scope, using a stack frame that doesn't exist anymore. We can't calculate the address of these variables when the next/step/stepout command is initiated either, because between that point and the time where the stepout breakpoint is actually hit the goroutine stack could grow and be moved to a different memory address.
116 lines
3.3 KiB
Go
116 lines
3.3 KiB
Go
package proc
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import (
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"go/ast"
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)
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// Process represents the target of the debugger. This
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// target could be a system process, core file, etc.
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//
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// Implementations of Process are not required to be thread safe and users
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// of Process should not assume they are.
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// There is one exception to this rule: it is safe to call RequestManualStop
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// concurrently with ContinueOnce.
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type Process interface {
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Info
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ProcessManipulation
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BreakpointManipulation
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RecordingManipulation
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}
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// RecordingManipulation is an interface for manipulating process recordings.
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type RecordingManipulation interface {
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// Recorded returns true if the current process is a recording and the path
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// to the trace directory.
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Recorded() (recorded bool, tracedir string)
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// Restart restarts the recording from the specified position, or from the
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// last checkpoint if pos == "".
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// If pos starts with 'c' it's a checkpoint ID, otherwise it's an event
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// number.
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Restart(pos string) error
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// Direction changes execution direction.
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Direction(Direction) error
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// When returns current recording position.
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When() (string, error)
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// Checkpoint sets a checkpoint at the current position.
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Checkpoint(where string) (id int, err error)
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// Checkpoints returns the list of currently set checkpoint.
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Checkpoints() ([]Checkpoint, error)
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// ClearCheckpoint removes a checkpoint.
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ClearCheckpoint(id int) error
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}
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type Direction int8
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const (
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Forward Direction = 0
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Backward Direction = 1
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)
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// Checkpoint is a checkpoint
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type Checkpoint struct {
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ID int
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When string
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Where string
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}
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// Info is an interface that provides general information on the target.
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type Info interface {
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Pid() int
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// ResumeNotify specifies a channel that will be closed the next time
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// ContinueOnce finishes resuming the target.
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ResumeNotify(chan<- struct{})
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Exited() bool
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BinInfo() *BinaryInfo
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// Common returns a struct with fields common to all backends
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Common() *CommonProcess
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ThreadInfo
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GoroutineInfo
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}
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// ThreadInfo is an interface for getting information on active threads
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// in the process.
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type ThreadInfo interface {
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FindThread(threadID int) (Thread, bool)
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ThreadList() []Thread
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CurrentThread() Thread
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}
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// GoroutineInfo is an interface for getting information on running goroutines.
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type GoroutineInfo interface {
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SelectedGoroutine() *G
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}
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// ProcessManipulation is an interface for changing the execution state of a process.
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type ProcessManipulation interface {
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ContinueOnce() (trapthread Thread, err error)
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StepInstruction() error
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SwitchThread(int) error
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SwitchGoroutine(int) error
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RequestManualStop() error
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// CheckAndClearManualStopRequest returns true the first time it's called
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// after a call to RequestManualStop.
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CheckAndClearManualStopRequest() bool
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Detach(bool) error
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}
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// BreakpointManipulation is an interface for managing breakpoints.
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type BreakpointManipulation interface {
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Breakpoints() *BreakpointMap
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SetBreakpoint(addr uint64, kind BreakpointKind, cond ast.Expr) (*Breakpoint, error)
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ClearBreakpoint(addr uint64) (*Breakpoint, error)
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ClearInternalBreakpoints() error
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}
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// CommonProcess contains fields used by this package, common to all
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// implementations of the Process interface.
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type CommonProcess struct {
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allGCache []*G
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}
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// ClearAllGCache clears the cached contents of the cache for runtime.allgs.
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func (p *CommonProcess) ClearAllGCache() {
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p.allGCache = nil
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}
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