fix: revert backtrace frame from entrypoint to method

fvm/src/call_manager/backtrace.rs

@@ -4,12 +4,10 @@ use std::fmt::Display;
 
 use fvm_shared::address::Address;
 use fvm_shared::error::{ErrorNumber, ExitCode};
-use fvm_shared::ActorID;
+use fvm_shared::{ActorID, MethodNum};
 
 use crate::kernel::SyscallError;
 
-use super::Entrypoint;
-
 /// A call backtrace records the actors an error was propagated through, from
 /// the moment it was emitted. The original error is the _cause_. Backtraces are
 /// useful for identifying the root cause of an error.
@@ -78,8 +76,8 @@ impl Backtrace {
 pub struct Frame {
     /// The actor that exited with this code.
     pub source: ActorID,
-    /// The entrypoint that was invoked.
-    pub entrypoint: Entrypoint,
+    /// The method that was invoked.
+    pub method: MethodNum,
     /// The exit code.
     pub code: ExitCode,
     /// The abort message.
@@ -92,7 +90,7 @@ impl Display for Frame {
             f,
             "{} (method {}) -- {} ({})",
             Address::new_id(self.source),
-            self.entrypoint,
+            self.method,
             &self.message,
             self.code,
         )

fvm/src/call_manager/default.rs

@@ -859,16 +859,21 @@ where
                     };
 
                     if !code.is_success() {
-                        if let Some(err) = last_error {
-                            cm.backtrace.begin(err);
+                        // Only record backtrace frames for explicit messages sent by the user. We
+                        // may want to record frames for failed upgrades, but that complicates
+                        // things a bit and I'd like to keep this API the same for now.
+                        if let &Entrypoint::Invoke(method) = &entrypoint {
+                            if let Some(err) = last_error {
+                                cm.backtrace.begin(err);
+                            }
+
+                            cm.backtrace.push_frame(Frame {
+                                source: to,
+                                method,
+                                message,
+                                code,
+                            });
                         }
-
-                        cm.backtrace.push_frame(Frame {
-                            source: to,
-                            entrypoint,
-                            message,
-                            code,
-                        });
                     }
 
                     res