prog: measure memory allocation in benchmarks

Enable ReportAllocs.
Also factor out common code into a helper function
(duplicated in 3 places now).

3 files changed, 17 insertions, 21 deletions

diff --git a/prog/export_test.go b/prog/export_test.go
index 1aaea30dc..9ea3f612e 100644
--- a/prog/export_test.go
+++ b/prog/export_test.go
@@ -89,3 +89,14 @@ func testEachTargetRandom(t *testing.T, fn func(t *testing.T, target *Target, rs
 		})
 	}
 }
+
+func initBench(b *testing.B) (*Target, func()) {
+	olddebug := debug
+	debug = false
+	target, err := GetTarget("linux", "amd64")
+	if err != nil {
+		b.Fatal(err)
+	}
+	b.ReportAllocs()
+	return target, func() { debug = olddebug }
+}
diff --git a/prog/hints_test.go b/prog/hints_test.go
index 67a250431..78b86e57c 100644
--- a/prog/hints_test.go
+++ b/prog/hints_test.go
@@ -480,13 +480,8 @@ func TestHintsData(t *testing.T) {
 }
 
 func BenchmarkHints(b *testing.B) {
-	olddebug := debug
-	debug = false
-	defer func() { debug = olddebug }()
-	target, err := GetTarget("linux", "amd64")
-	if err != nil {
-		b.Fatal(err)
-	}
+	target, cleanup := initBench(b)
+	defer cleanup()
 	rs := rand.NewSource(0)
 	r := newRand(target, rs)
 	p := target.Generate(rs, 30, nil)
diff --git a/prog/mutation_test.go b/prog/mutation_test.go
index 6b50b975e..b041f02d2 100644
--- a/prog/mutation_test.go
+++ b/prog/mutation_test.go
@@ -220,13 +220,8 @@ func runMutationTests(t *testing.T, tests [][2]string) {
 }
 
 func BenchmarkMutate(b *testing.B) {
-	olddebug := debug
-	debug = false
-	defer func() { debug = olddebug }()
-	target, err := GetTarget("linux", "amd64")
-	if err != nil {
-		b.Fatal(err)
-	}
+	target, cleanup := initBench(b)
+	defer cleanup()
 	ct := linuxAmd64ChoiceTable(target)
 	const progLen = 30
 	p := target.Generate(rand.NewSource(0), progLen, nil)
@@ -240,13 +235,8 @@ func BenchmarkMutate(b *testing.B) {
 }
 
 func BenchmarkGenerate(b *testing.B) {
-	olddebug := debug
-	debug = false
-	defer func() { debug = olddebug }()
-	target, err := GetTarget("linux", "amd64")
-	if err != nil {
-		b.Fatal(err)
-	}
+	target, cleanup := initBench(b)
+	defer cleanup()
 	ct := linuxAmd64ChoiceTable(target)
 	const progLen = 30
 	b.ResetTimer()