Adding upstream version 1.21.8.upstream/1.21.8

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 138 insertions, 0 deletions

diff --git a/src/runtime/start_line_test.go b/src/runtime/start_line_test.go
new file mode 100644
index 0000000..0762351
--- /dev/null
+++ b/src/runtime/start_line_test.go
@@ -0,0 +1,138 @@
+// 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 runtime_test
+
+import (
+	"fmt"
+	"internal/testenv"
+	"runtime"
+	"testing"
+)
+
+// The tests in this file test the function start line metadata included in
+// _func and inlinedCall. TestStartLine hard-codes the start lines of functions
+// in this file. If code moves, the test will need to be updated.
+//
+// The "start line" of a function should be the line containing the func
+// keyword.
+
+func normalFunc() int {
+	return callerStartLine(false)
+}
+
+func multilineDeclarationFunc() int {
+	return multilineDeclarationFunc1(0, 0, 0)
+}
+
+//go:noinline
+func multilineDeclarationFunc1(
+	a, b, c int) int {
+	return callerStartLine(false)
+}
+
+func blankLinesFunc() int {
+
+	// Some
+	// lines
+	// without
+	// code
+
+	return callerStartLine(false)
+}
+
+func inlineFunc() int {
+	return inlineFunc1()
+}
+
+func inlineFunc1() int {
+	return callerStartLine(true)
+}
+
+var closureFn func() int
+
+func normalClosure() int {
+	// Assign to global to ensure this isn't inlined.
+	closureFn = func() int {
+		return callerStartLine(false)
+	}
+	return closureFn()
+}
+
+func inlineClosure() int {
+	return func() int {
+		return callerStartLine(true)
+	}()
+}
+
+func TestStartLine(t *testing.T) {
+	// We test inlined vs non-inlined variants. We can't do that if
+	// optimizations are disabled.
+	testenv.SkipIfOptimizationOff(t)
+
+	testCases := []struct {
+		name string
+		fn   func() int
+		want int
+	}{
+		{
+			name: "normal",
+			fn:   normalFunc,
+			want: 21,
+		},
+		{
+			name: "multiline-declaration",
+			fn:   multilineDeclarationFunc,
+			want: 30,
+		},
+		{
+			name: "blank-lines",
+			fn:   blankLinesFunc,
+			want: 35,
+		},
+		{
+			name: "inline",
+			fn:   inlineFunc,
+			want: 49,
+		},
+		{
+			name: "normal-closure",
+			fn:   normalClosure,
+			want: 57,
+		},
+		{
+			name: "inline-closure",
+			fn:   inlineClosure,
+			want: 64,
+		},
+	}
+
+	for _, tc := range testCases {
+		t.Run(tc.name, func(t *testing.T) {
+			got := tc.fn()
+			if got != tc.want {
+				t.Errorf("start line got %d want %d", got, tc.want)
+			}
+		})
+	}
+}
+
+//go:noinline
+func callerStartLine(wantInlined bool) int {
+	var pcs [1]uintptr
+	n := runtime.Callers(2, pcs[:])
+	if n != 1 {
+		panic(fmt.Sprintf("no caller of callerStartLine? n = %d", n))
+	}
+
+	frames := runtime.CallersFrames(pcs[:])
+	frame, _ := frames.Next()
+
+	inlined := frame.Func == nil // Func always set to nil for inlined frames
+	if wantInlined != inlined {
+		panic(fmt.Sprintf("caller %s inlined got %v want %v", frame.Function, inlined, wantInlined))
+	}
+
+	return runtime.FrameStartLine(&frame)
+}