Rewrite Obj-C workflow in Rust

This is functionally equivalent to the previous workflow_objc, with the
following changes:
1. It mutates the `core.function.metaAnalysis` workflow rather than
   registering a new named workflow. The activities now all check for
   the presence of the Objective-C metadata added by `ObjCProcessor` to
   determine whether they should do work, rather than relying on
   `MachoView` to override the function workflow when Objective-C
   metadata is present. This fixes
   https://github.com/Vector35/binaryninja-api/issues/6779.
2. The auto-inlining of `objc_msgSend` selector stub functions is
   performed in a separate activity from the processing of
   `objc_msgSend` call sites. The selector stub inlining activity is
   configured so that it does not run in `DSCView` as the shared cache
   needs different behavior for stub functions more generally that
   `SharedCacheWorkflow` already provides.
3. The way that types like `id` and `SEL` are referenced is fixed so
   that they show up as `id` rather than `objc_struct*`.

This also replaces the Objective-C portion of the shared cache's
workflow, and incorporates several bug fixes that had been applied to it
but not the standalone Objective-C workflow.

1 files changed, 26 insertions, 0 deletions

diff --git a/plugins/workflow_objc/src/activities/inline_stubs.rs b/plugins/workflow_objc/src/activities/inline_stubs.rs
new file mode 100644
index 00000000..daae9baa
--- /dev/null
+++ b/plugins/workflow_objc/src/activities/inline_stubs.rs
@@ -0,0 +1,26 @@
+use binaryninja::workflow::AnalysisContext;
+
+use crate::{metadata::GlobalState, Error};
+
+// If this function is within a section known to contain Objective-C stubs,
+// mark it as being inlined during analysis.
+pub fn process(ac: &AnalysisContext) -> Result<(), Error> {
+    let view = ac.view();
+    if GlobalState::should_ignore_view(&view) {
+        return Ok(());
+    }
+
+    let func = ac.function();
+    let Some(objc_stubs) = GlobalState::analysis_info(&view)
+        .as_ref()
+        .and_then(|info| info.objc_stubs.clone())
+    else {
+        return Ok(());
+    };
+
+    if objc_stubs.contains(&func.start()) {
+        func.set_auto_inline_during_analysis(true);
+    }
+
+    Ok(())
+}