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, 15 insertions, 0 deletions

diff --git a/plugins/workflow_objc/build.rs b/plugins/workflow_objc/build.rs
new file mode 100644
index 00000000..ed6cec7d
--- /dev/null
+++ b/plugins/workflow_objc/build.rs
@@ -0,0 +1,15 @@
+fn main() {
+    let link_path = std::env::var_os("DEP_BINARYNINJACORE_PATH")
+        .expect("DEP_BINARYNINJACORE_PATH not specified");
+
+    println!("cargo::rustc-link-lib=dylib=binaryninjacore");
+    println!("cargo::rustc-link-search={}", link_path.to_str().unwrap());
+
+    #[cfg(not(target_os = "windows"))]
+    {
+        println!(
+            "cargo::rustc-link-arg=-Wl,-rpath,{0},-L{0}",
+            link_path.to_string_lossy()
+        );
+    }
+}