regexp: don't allocate when All methods find no matches

name                old time/op    new time/op    delta
FindAllNoMatches-8     216ns ± 3%     122ns ± 2%   -43.52%  (p=0.000 n=10+10)

name                old alloc/op   new alloc/op   delta
FindAllNoMatches-8      240B ± 0%        0B       -100.00%  (p=0.000 n=10+10)

name                old allocs/op  new allocs/op  delta
FindAllNoMatches-8      1.00 ± 0%      0.00       -100.00%  (p=0.000 n=10+10)

This work was supported by Sourcegraph.

Change-Id: I30aac201370ccfb40a6ff637402020ac20f61f70
Reviewed-on: https://go-review.googlesource.com/87418
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Daniel Martí <mvdan@mvdan.cc>
TryBot-Result: Gobot Gobot <gobot@golang.org>

src/regexp/all_test.go

@@ -581,6 +581,19 @@ func BenchmarkFind(b *testing.B) {
	}
}

func BenchmarkFindAllNoMatches(b *testing.B) {
	re := MustCompile("a+b+")
	s := []byte("acddee")
	b.ReportAllocs()
	b.ResetTimer()
	for i := 0; i < b.N; i++ {
		all := re.FindAll(s, -1)
		if all != nil {
			b.Fatalf("FindAll(%q) = %q; want nil", s, all)
		}
	}
}

func BenchmarkFindString(b *testing.B) {
	b.StopTimer()
	re := MustCompile("a+b+")

src/regexp/regexp.go

@@ -984,13 +984,13 @@ func (re *Regexp) FindAll(b []byte, n int) [][]byte {
	if n < 0 {
		n = len(b) + 1
	}
	result := make([][]byte, 0, startSize)
	var result [][]byte
	re.allMatches("", b, n, func(match []int) {
		if result == nil {
			result = make([][]byte, 0, startSize)
		}
		result = append(result, b[match[0]:match[1]])
	})
	if len(result) == 0 {
		return nil
	}
	return result
}

@@ -1002,13 +1002,13 @@ func (re *Regexp) FindAllIndex(b []byte, n int) [][]int {
	if n < 0 {
		n = len(b) + 1
	}
	result := make([][]int, 0, startSize)
	var result [][]int
	re.allMatches("", b, n, func(match []int) {
		if result == nil {
			result = make([][]int, 0, startSize)
		}
		result = append(result, match[0:2])
	})
	if len(result) == 0 {
		return nil
	}
	return result
}

@@ -1020,13 +1020,13 @@ func (re *Regexp) FindAllString(s string, n int) []string {
	if n < 0 {
		n = len(s) + 1
	}
	result := make([]string, 0, startSize)
	var result []string
	re.allMatches(s, nil, n, func(match []int) {
		if result == nil {
			result = make([]string, 0, startSize)
		}
		result = append(result, s[match[0]:match[1]])
	})
	if len(result) == 0 {
		return nil
	}
	return result
}

@@ -1038,13 +1038,13 @@ func (re *Regexp) FindAllStringIndex(s string, n int) [][]int {
	if n < 0 {
		n = len(s) + 1
	}
	result := make([][]int, 0, startSize)
	var result [][]int
	re.allMatches(s, nil, n, func(match []int) {
		if result == nil {
			result = make([][]int, 0, startSize)
		}
		result = append(result, match[0:2])
	})
	if len(result) == 0 {
		return nil
	}
	return result
}

@@ -1056,8 +1056,11 @@ func (re *Regexp) FindAllSubmatch(b []byte, n int) [][][]byte {
	if n < 0 {
		n = len(b) + 1
	}
	result := make([][][]byte, 0, startSize)
	var result [][][]byte
	re.allMatches("", b, n, func(match []int) {
		if result == nil {
			result = make([][][]byte, 0, startSize)
		}
		slice := make([][]byte, len(match)/2)
		for j := range slice {
			if match[2*j] >= 0 {
@@ -1066,9 +1069,6 @@ func (re *Regexp) FindAllSubmatch(b []byte, n int) [][][]byte {
		}
		result = append(result, slice)
	})
	if len(result) == 0 {
		return nil
	}
	return result
}

@@ -1080,13 +1080,13 @@ func (re *Regexp) FindAllSubmatchIndex(b []byte, n int) [][]int {
	if n < 0 {
		n = len(b) + 1
	}
	result := make([][]int, 0, startSize)
	var result [][]int
	re.allMatches("", b, n, func(match []int) {
		if result == nil {
			result = make([][]int, 0, startSize)
		}
		result = append(result, match)
	})
	if len(result) == 0 {
		return nil
	}
	return result
}

@@ -1098,8 +1098,11 @@ func (re *Regexp) FindAllStringSubmatch(s string, n int) [][]string {
	if n < 0 {
		n = len(s) + 1
	}
	result := make([][]string, 0, startSize)
	var result [][]string
	re.allMatches(s, nil, n, func(match []int) {
		if result == nil {
			result = make([][]string, 0, startSize)
		}
		slice := make([]string, len(match)/2)
		for j := range slice {
			if match[2*j] >= 0 {
@@ -1108,9 +1111,6 @@ func (re *Regexp) FindAllStringSubmatch(s string, n int) [][]string {
		}
		result = append(result, slice)
	})
	if len(result) == 0 {
		return nil
	}
	return result
}

@@ -1123,13 +1123,13 @@ func (re *Regexp) FindAllStringSubmatchIndex(s string, n int) [][]int {
	if n < 0 {
		n = len(s) + 1
	}
	result := make([][]int, 0, startSize)
	var result [][]int
	re.allMatches(s, nil, n, func(match []int) {
		if result == nil {
			result = make([][]int, 0, startSize)
		}
		result = append(result, match)
	})
	if len(result) == 0 {
		return nil
	}
	return result
}