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compiler: do not emit code for unused imported functions

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Our current algorithm marks function as used if it is called
at least ones, even if the callee function is itself unused.
This commit implements more clever traversal to collect usage
information more precisely.

Signed-off-by: Evgeniy Stratonikov <evgeniy@nspcc.ru>
This commit is contained in:
Evgeniy Stratonikov 2021-09-30 11:48:18 +03:00
parent a340e11b0b
commit 0bc81aecf4
6 changed files with 174 additions and 10 deletions
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34
pkg/compiler/compiler_test.go
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@ -180,6 +180,40 @@ func TestEventWarnings(t *testing.T) {
})
require.NoError(t, err)
})
t.Run("event in imported package", func(t *testing.T) {
t.Run("unused", func(t *testing.T) {
src := `package foo
import "github.com/nspcc-dev/neo-go/pkg/compiler/testdata/notify"
func Main() int {
return notify.Value
}`
_, di, err := compiler.CompileWithDebugInfo("eventTest", strings.NewReader(src))
require.NoError(t, err)
_, err = compiler.CreateManifest(di, &compiler.Options{NoEventsCheck: true})
require.NoError(t, err)
})
t.Run("used", func(t *testing.T) {
src := `package foo
import "github.com/nspcc-dev/neo-go/pkg/compiler/testdata/notify"
func Main() int {
notify.EmitEvent()
return 42
}`
_, di, err := compiler.CompileWithDebugInfo("eventTest", strings.NewReader(src))
require.NoError(t, err)
_, err = compiler.CreateManifest(di, &compiler.Options{})
require.Error(t, err)
_, err = compiler.CreateManifest(di, &compiler.Options{
ContractEvents: []manifest.Event{{Name: "Event"}},
})
require.NoError(t, err)
})
})
}
func TestNotifyInVerify(t *testing.T) {