// expressionValues evaluates a slice of expressions and returns a []*cd.Variable
// containing the results.
// If the result of an expression evaluation refers to values from the program's
// memory (e.g., the expression evaluates to a slice) a corresponding variable is
// added to the value collector, to be read later.
func expressionValues(expressions []string, prog debug.Program, vc *valuecollector.Collector) []*cd.Variable {
evaluatedExpressions := make([]*cd.Variable, len(expressions))
for i, exp := range expressions {
ee := &cd.Variable{Name: exp}
evaluatedExpressions[i] = ee
if val, err := prog.Evaluate(exp); err != nil {
ee.Status = errorStatusMessage(err.Error(), refersToBreakpointExpression)
} else {
vc.FillValue(val, ee)
}
}
return evaluatedExpressions
}
// stackFrames returns a stack trace for the program. It passes references to
// function parameters and local variables to the value collector, so it can read
// their values later.
func stackFrames(prog debug.Program, vc *valuecollector.Collector) ([]*cd.StackFrame, *cd.StatusMessage) {
frames, err := prog.Frames(maxCapturedStackFrames)
if err != nil {
return nil, errorStatusMessage("Error getting stack: "+err.Error(), refersToUnspecified)
}
stackFrames := make([]*cd.StackFrame, len(frames))
for i, f := range frames {
frame := &cd.StackFrame{}
frame.Function = f.Function
for _, v := range f.Params {
frame.Arguments = append(frame.Arguments, vc.AddVariable(debug.LocalVar(v)))
}
for _, v := range f.Vars {
frame.Locals = append(frame.Locals, vc.AddVariable(v))
}
frame.Location = &cd.SourceLocation{
Path: f.File,
Line: int64(f.Line),
}
stackFrames[i] = frame
}
return stackFrames, nil
}