1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
|
package rule
import (
"go/ast"
"github.com/mgechev/revive/lint"
)
// CallToGCRule lints calls to the garbage collector.
type CallToGCRule struct{}
// Apply applies the rule to given file.
func (r *CallToGCRule) Apply(file *lint.File, _ lint.Arguments) []lint.Failure {
var failures []lint.Failure
onFailure := func(failure lint.Failure) {
failures = append(failures, failure)
}
var gcTriggeringFunctions = map[string]map[string]bool{
"runtime": map[string]bool{"GC": true},
}
w := lintCallToGC{onFailure, gcTriggeringFunctions}
ast.Walk(w, file.AST)
return failures
}
// Name returns the rule name.
func (r *CallToGCRule) Name() string {
return "call-to-gc"
}
type lintCallToGC struct {
onFailure func(lint.Failure)
gcTriggeringFunctions map[string]map[string]bool
}
func (w lintCallToGC) Visit(node ast.Node) ast.Visitor {
ce, ok := node.(*ast.CallExpr)
if !ok {
return w // nothing to do, the node is not a call
}
fc, ok := ce.Fun.(*ast.SelectorExpr)
if !ok {
return nil // nothing to do, the call is not of the form pkg.func(...)
}
id, ok := fc.X.(*ast.Ident)
if !ok {
return nil // in case X is not an id (it should be!)
}
fn := fc.Sel.Name
pkg := id.Name
if !w.gcTriggeringFunctions[pkg][fn] {
return nil // it isn't a call to a GC triggering function
}
w.onFailure(lint.Failure{
Confidence: 1,
Node: node,
Category: "bad practice",
Failure: "explicit call to the garbage collector",
})
return w
}
|
