Example #1
0
// Fetches all variables of a specific type in the current function scope
func (thread *Thread) variablesByTag(tag dwarf.Tag) ([]*Variable, error) {
	pc, err := thread.PC()
	if err != nil {
		return nil, err
	}

	reader := thread.dbp.DwarfReader()

	_, err = reader.SeekToFunction(pc)
	if err != nil {
		return nil, err
	}

	vars := make([]*Variable, 0)

	for entry, err := reader.NextScopeVariable(); entry != nil; entry, err = reader.NextScopeVariable() {
		if err != nil {
			return nil, err
		}

		if entry.Tag == tag {
			val, err := thread.extractVariableFromEntry(entry)
			if err != nil {
				// skip variables that we can't parse yet
				continue
			}

			vars = append(vars, val)
		}
	}

	return vars, nil
}
Example #2
0
// Fetches all variables of a specific type in the current function scope
func (scope *EvalScope) variablesByTag(tag dwarf.Tag, cfg LoadConfig) ([]*Variable, error) {
	reader := scope.DwarfReader()

	_, err := reader.SeekToFunction(scope.PC)
	if err != nil {
		return nil, err
	}

	var vars []*Variable
	for entry, err := reader.NextScopeVariable(); entry != nil; entry, err = reader.NextScopeVariable() {
		if err != nil {
			return nil, err
		}

		if entry.Tag == tag {
			val, err := scope.extractVariableFromEntry(entry, cfg)
			if err != nil {
				// skip variables that we can't parse yet
				continue
			}

			vars = append(vars, val)
		}
	}

	return vars, nil
}
Example #3
0
// Returns the value of the named variable.
func (thread *Thread) EvalVariable(name string) (*Variable, error) {
	pc, err := thread.PC()
	if err != nil {
		return nil, err
	}

	reader := thread.dbp.DwarfReader()

	_, err = reader.SeekToFunction(pc)
	if err != nil {
		return nil, err
	}

	varName := name
	memberName := ""
	if strings.Contains(name, ".") {
		idx := strings.Index(name, ".")
		varName = name[:idx]
		memberName = name[idx+1:]
	}

	for entry, err := reader.NextScopeVariable(); entry != nil; entry, err = reader.NextScopeVariable() {
		if err != nil {
			return nil, err
		}

		n, ok := entry.Val(dwarf.AttrName).(string)
		if !ok {
			continue
		}

		if n == varName {
			if len(memberName) == 0 {
				return thread.extractVariableFromEntry(entry)
			}
			return thread.evaluateStructMember(entry, reader, memberName)
		}
	}

	// Attempt to evaluate name as a package variable.
	if memberName != "" {
		return thread.EvalPackageVariable(name)
	} else {
		loc, err := thread.Location()
		if err == nil && loc.Fn != nil {
			v, err := thread.EvalPackageVariable(loc.Fn.PackageName() + "." + name)
			if err == nil {
				v.Name = name
				return v, nil
			}
		}
	}

	return nil, fmt.Errorf("could not find symbol value for %s", name)
}
Example #4
0
// Returns the value of the named variable.
func (thread *Thread) EvalVariable(name string) (*Variable, error) {
	pc, err := thread.PC()
	if err != nil {
		return nil, err
	}

	reader := thread.dbp.DwarfReader()

	_, err = reader.SeekToFunction(pc)
	if err != nil {
		return nil, err
	}

	varName := name
	memberName := ""
	if strings.Contains(name, ".") {
		idx := strings.Index(name, ".")
		varName = name[:idx]
		memberName = name[idx+1:]
	}

	for entry, err := reader.NextScopeVariable(); entry != nil; entry, err = reader.NextScopeVariable() {
		if err != nil {
			return nil, err
		}

		n, ok := entry.Val(dwarf.AttrName).(string)
		if !ok {
			continue
		}

		if n == varName {
			if len(memberName) == 0 {
				return thread.extractVariableFromEntry(entry)
			}
			return thread.evaluateStructMember(entry, reader, memberName)
		}
	}

	return nil, fmt.Errorf("could not find symbol value for %s", name)
}
Example #5
0
func (scope *EvalScope) extractVarInfo(varName string) (*Variable, error) {
	reader := scope.DwarfReader()

	_, err := reader.SeekToFunction(scope.PC)
	if err != nil {
		return nil, err
	}

	for entry, err := reader.NextScopeVariable(); entry != nil; entry, err = reader.NextScopeVariable() {
		if err != nil {
			return nil, err
		}

		n, ok := entry.Val(dwarf.AttrName).(string)
		if !ok {
			continue
		}

		if n == varName {
			return scope.extractVarInfoFromEntry(entry, reader)
		}
	}
	return nil, fmt.Errorf("could not find symbol value for %s", varName)
}