1 files changed, 106 insertions, 0 deletions
diff --git a/src/cmd/compile/internal/ssa/testdata/hist.go b/src/cmd/compile/internal/ssa/testdata/hist.go
new file mode 100644
index 0000000..f8fa6e6
--- /dev/null
+++ b/src/cmd/compile/internal/ssa/testdata/hist.go
@@ -0,0 +1,106 @@
+// Copyright 2017 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.
+
+// This is the input program for an end-to-end test of the DWARF produced
+// by the compiler. It is compiled with various flags, then the resulting
+// binary is "debugged" under the control of a harness.  Because the compile+debug
+// step is time-consuming, the tests for different bugs are all accumulated here
+// so that their cost is only the time to "n" through the additional code.
+
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"io"
+	"os"
+	"strconv"
+	"strings"
+)
+
+type point struct {
+	x, y int
+}
+
+type line struct {
+	begin, end point
+}
+
+var zero int
+var sink int
+
+//go:noinline
+func tinycall() {
+}
+
+func ensure(n int, sl []int) []int {
+	for len(sl) <= n {
+		sl = append(sl, 0)
+	}
+	return sl
+}
+
+var cannedInput string = `1
+1
+1
+2
+2
+2
+4
+4
+5
+`
+
+func test() {
+	// For #19868
+	l := line{point{1 + zero, 2 + zero}, point{3 + zero, 4 + zero}}
+	tinycall()                // this forces l etc to stack
+	dx := l.end.x - l.begin.x //gdb-dbg=(l.begin.x,l.end.y)//gdb-opt=(l,dx/O,dy/O)
+	dy := l.end.y - l.begin.y //gdb-opt=(dx,dy/O)
+	sink = dx + dy            //gdb-opt=(dx,dy)
+	// For #21098
+	hist := make([]int, 7)                                //gdb-opt=(dx/O,dy/O) // TODO sink is missing if this code is in 'test' instead of 'main'
+	var reader io.Reader = strings.NewReader(cannedInput) //gdb-dbg=(hist/A) // TODO cannedInput/A is missing if this code is in 'test' instead of 'main'
+	if len(os.Args) > 1 {
+		var err error
+		reader, err = os.Open(os.Args[1])
+		if err != nil {
+			fmt.Fprintf(os.Stderr, "There was an error opening %s: %v\n", os.Args[1], err)
+			return
+		}
+	}
+	scanner := bufio.NewScanner(reader)
+	for scanner.Scan() { //gdb-opt=(scanner/A)
+		s := scanner.Text()
+		i, err := strconv.ParseInt(s, 10, 64)
+		if err != nil { //gdb-dbg=(i) //gdb-opt=(err,hist,i)
+			fmt.Fprintf(os.Stderr, "There was an error: %v\n", err)
+			return
+		}
+		hist = ensure(int(i), hist)
+		hist[int(i)]++
+	}
+	t := 0
+	n := 0
+	for i, a := range hist {
+		if a == 0 { //gdb-opt=(a,n,t)
+			continue
+		}
+		t += i * a
+		n += a
+		fmt.Fprintf(os.Stderr, "%d\t%d\t%d\t%d\t%d\n", i, a, n, i*a, t) //gdb-dbg=(n,i,t)
+	}
+}
+
+func main() {
+	growstack() // Use stack early to prevent growth during test, which confuses gdb
+	test()
+}
+
+var snk string
+
+//go:noinline
+func growstack() {
+	snk = fmt.Sprintf("%#v,%#v,%#v", 1, true, "cat")
+}