Make it possible to debug soong_ui.
This works by setting the SOONG_UI_DELVE= environment variable to the
port on which soong_ui should accept a Delve connection on.
This is achieved by reusing the Delve execution logic between soong_ui
and soong_build.
Test: Manual.
Change-Id: Id2c1d4b6faac1a4a3918c91030ce2239f7daf54f
diff --git a/shared/debug.go b/shared/debug.go
index 0c9ba4f..5392f2b 100644
--- a/shared/debug.go
+++ b/shared/debug.go
@@ -1,8 +1,15 @@
package shared
import (
+ "fmt"
"os"
"os/exec"
+ "strings"
+ "syscall"
+)
+
+var (
+ isDebugging bool
)
// Finds the Delve binary to use. Either uses the SOONG_DELVE_PATH environment
@@ -15,3 +22,48 @@
return result
}
+
+// Returns whether the current process is running under Delve due to
+// ReexecWithDelveMaybe().
+func IsDebugging() bool {
+ return isDebugging
+}
+
+// Re-executes the binary in question under the control of Delve when
+// delveListen is not the empty string. delvePath gives the path to the Delve.
+func ReexecWithDelveMaybe(delveListen, delvePath string) {
+ isDebugging = os.Getenv("SOONG_DELVE_REEXECUTED") == "true"
+ if isDebugging || delveListen == "" {
+ return
+ }
+
+ if delvePath == "" {
+ fmt.Fprintln(os.Stderr, "Delve debugging requested but failed to find dlv")
+ os.Exit(1)
+ }
+
+ soongDelveEnv := []string{}
+ for _, env := range os.Environ() {
+ idx := strings.IndexRune(env, '=')
+ if idx != -1 {
+ soongDelveEnv = append(soongDelveEnv, env)
+ }
+ }
+
+ soongDelveEnv = append(soongDelveEnv, "SOONG_DELVE_REEXECUTED=true")
+
+ dlvArgv := []string{
+ delvePath,
+ "--listen=:" + delveListen,
+ "--headless=true",
+ "--api-version=2",
+ "exec",
+ os.Args[0],
+ "--",
+ }
+
+ dlvArgv = append(dlvArgv, os.Args[1:]...)
+ syscall.Exec(delvePath, dlvArgv, soongDelveEnv)
+ fmt.Fprintln(os.Stderr, "exec() failed while trying to reexec with Delve")
+ os.Exit(1)
+}