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-rw-r--r--src/runtime/testdata/testprogcgo/pprof.go93
1 files changed, 93 insertions, 0 deletions
diff --git a/src/runtime/testdata/testprogcgo/pprof.go b/src/runtime/testdata/testprogcgo/pprof.go
new file mode 100644
index 0000000..8870d0c
--- /dev/null
+++ b/src/runtime/testdata/testprogcgo/pprof.go
@@ -0,0 +1,93 @@
+// Copyright 2016 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 main
+
+// Run a slow C function saving a CPU profile.
+
+/*
+#include <stdint.h>
+
+int salt1;
+int salt2;
+
+void cpuHog() {
+ int foo = salt1;
+ int i;
+
+ for (i = 0; i < 100000; i++) {
+ if (foo > 0) {
+ foo *= foo;
+ } else {
+ foo *= foo + 1;
+ }
+ }
+ salt2 = foo;
+}
+
+void cpuHog2() {
+}
+
+struct cgoTracebackArg {
+ uintptr_t context;
+ uintptr_t sigContext;
+ uintptr_t* buf;
+ uintptr_t max;
+};
+
+// pprofCgoTraceback is passed to runtime.SetCgoTraceback.
+// For testing purposes it pretends that all CPU hits in C code are in cpuHog.
+// Issue #29034: At least 2 frames are required to verify all frames are captured
+// since runtime/pprof ignores the runtime.goexit base frame if it exists.
+void pprofCgoTraceback(void* parg) {
+ struct cgoTracebackArg* arg = (struct cgoTracebackArg*)(parg);
+ arg->buf[0] = (uintptr_t)(cpuHog) + 0x10;
+ arg->buf[1] = (uintptr_t)(cpuHog2) + 0x4;
+ arg->buf[2] = 0;
+}
+*/
+import "C"
+
+import (
+ "fmt"
+ "os"
+ "runtime"
+ "runtime/pprof"
+ "time"
+ "unsafe"
+)
+
+func init() {
+ register("CgoPprof", CgoPprof)
+}
+
+func CgoPprof() {
+ runtime.SetCgoTraceback(0, unsafe.Pointer(C.pprofCgoTraceback), nil, nil)
+
+ f, err := os.CreateTemp("", "prof")
+ if err != nil {
+ fmt.Fprintln(os.Stderr, err)
+ os.Exit(2)
+ }
+
+ if err := pprof.StartCPUProfile(f); err != nil {
+ fmt.Fprintln(os.Stderr, err)
+ os.Exit(2)
+ }
+
+ t0 := time.Now()
+ for time.Since(t0) < time.Second {
+ C.cpuHog()
+ }
+
+ pprof.StopCPUProfile()
+
+ name := f.Name()
+ if err := f.Close(); err != nil {
+ fmt.Fprintln(os.Stderr, err)
+ os.Exit(2)
+ }
+
+ fmt.Println(name)
+}