project: add region method to return a project's region

cli/src/main.rs

@@ -19,7 +19,6 @@ use panopticon_amd64 as amd64;
 use panopticon_analysis::pipeline;
 use panopticon_avr as avr;
 use panopticon_core::{Machine, Function, loader};
-use panopticon_graph_algos::GraphTrait;
 use std::path::Path;
 use std::result;
 use std::sync::Arc;
@@ -86,7 +85,7 @@ fn disassemble(args: Args) -> Result<()> {
     let filter = Filter { name: args.function_filter, addr: args.address_filter.map(|addr| u64::from_str_radix(&addr, 16).unwrap()) };
     let (mut proj, machine) = loader::load(Path::new(&binary))?;
     let maybe_prog = proj.code.pop();
-    let reg = proj.data.dependencies.vertex_label(proj.data.root).unwrap().clone();
+    let reg = proj.region().clone();
 
     if let Some(prog) = maybe_prog {
         let prog = Arc::new(prog);

core/src/project.rs

@@ -22,6 +22,7 @@
 
 
 use {CallGraphRef, Function, Program, Region, Result, World};
+use panopticon_graph_algos::GraphTrait;
 use byteorder::{BigEndian, ReadBytesExt, WriteBytesExt};
 use flate2::Compression;
 use flate2::read::ZlibDecoder;
@@ -63,6 +64,12 @@ impl Project {
         }
     }
 
+    /// Returns this project's root Region
+    pub fn region(&self) -> &Region {
+        // this cannot fail because World::new guarantees that data.root = r
+        self.data.dependencies.vertex_label(self.data.root).unwrap()
+    }
+
     /// Reads a serialized project from disk.
     pub fn open(p: &Path) -> Result<Project> {
         let mut fd = match File::open(p) {

qt/src/singleton.rs

@@ -155,7 +155,7 @@ impl Panopticon {
             }
         } else if let Ok((mut proj, machine)) = loader::load(&Path::new(&path)) {
             let maybe_prog = proj.code.pop();
-            let reg = proj.data.dependencies.vertex_label(proj.data.root).unwrap().clone();
+            let reg = proj.region().clone();
 
             if let Some(prog) = maybe_prog {
                 let prog = ::std::sync::Arc::new(prog);