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// Copyright 2022 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package cmerge_test
import (
"fmt"
"internal/coverage"
"internal/coverage/cmerge"
"testing"
)
func TestClash(t *testing.T) {
m := &cmerge.Merger{}
err := m.SetModeAndGranularity("mdf1.data", coverage.CtrModeSet, coverage.CtrGranularityPerBlock)
if err != nil {
t.Fatalf("unexpected clash: %v", err)
}
err = m.SetModeAndGranularity("mdf1.data", coverage.CtrModeSet, coverage.CtrGranularityPerBlock)
if err != nil {
t.Fatalf("unexpected clash: %v", err)
}
err = m.SetModeAndGranularity("mdf1.data", coverage.CtrModeCount, coverage.CtrGranularityPerBlock)
if err == nil {
t.Fatalf("expected mode clash, not found")
}
err = m.SetModeAndGranularity("mdf1.data", coverage.CtrModeSet, coverage.CtrGranularityPerFunc)
if err == nil {
t.Fatalf("expected granularity clash, not found")
}
m.SetModeMergePolicy(cmerge.ModeMergeRelaxed)
err = m.SetModeAndGranularity("mdf1.data", coverage.CtrModeCount, coverage.CtrGranularityPerBlock)
if err != nil {
t.Fatalf("unexpected clash: %v", err)
}
err = m.SetModeAndGranularity("mdf1.data", coverage.CtrModeSet, coverage.CtrGranularityPerBlock)
if err != nil {
t.Fatalf("unexpected clash: %v", err)
}
err = m.SetModeAndGranularity("mdf1.data", coverage.CtrModeAtomic, coverage.CtrGranularityPerBlock)
if err != nil {
t.Fatalf("unexpected clash: %v", err)
}
m.ResetModeAndGranularity()
err = m.SetModeAndGranularity("mdf1.data", coverage.CtrModeCount, coverage.CtrGranularityPerFunc)
if err != nil {
t.Fatalf("unexpected clash after reset: %v", err)
}
}
func TestBasic(t *testing.T) {
scenarios := []struct {
cmode coverage.CounterMode
cgran coverage.CounterGranularity
src, dst, res []uint32
iters int
merr bool
overflow bool
}{
{
cmode: coverage.CtrModeSet,
cgran: coverage.CtrGranularityPerBlock,
src: []uint32{1, 0, 1},
dst: []uint32{1, 1, 0},
res: []uint32{1, 1, 1},
iters: 2,
overflow: false,
},
{
cmode: coverage.CtrModeCount,
cgran: coverage.CtrGranularityPerBlock,
src: []uint32{1, 0, 3},
dst: []uint32{5, 7, 0},
res: []uint32{6, 7, 3},
iters: 1,
overflow: false,
},
{
cmode: coverage.CtrModeCount,
cgran: coverage.CtrGranularityPerBlock,
src: []uint32{4294967200, 0, 3},
dst: []uint32{4294967001, 7, 0},
res: []uint32{4294967295, 7, 3},
iters: 1,
overflow: true,
},
}
for k, scenario := range scenarios {
var err error
var ovf bool
m := &cmerge.Merger{}
mdf := fmt.Sprintf("file%d", k)
err = m.SetModeAndGranularity(mdf, scenario.cmode, scenario.cgran)
if err != nil {
t.Fatalf("case %d SetModeAndGranularity failed: %v", k, err)
}
for i := 0; i < scenario.iters; i++ {
err, ovf = m.MergeCounters(scenario.dst, scenario.src)
if ovf != scenario.overflow {
t.Fatalf("case %d overflow mismatch: got %v want %v", k, ovf, scenario.overflow)
}
if !scenario.merr && err != nil {
t.Fatalf("case %d unexpected err %v", k, err)
}
if scenario.merr && err == nil {
t.Fatalf("case %d expected err, not received", k)
}
for i := range scenario.dst {
if scenario.dst[i] != scenario.res[i] {
t.Fatalf("case %d: bad merge at %d got %d want %d",
k, i, scenario.dst[i], scenario.res[i])
}
}
}
}
}
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