Write .debug_frame information (#53)

* Write .debug_frame information

* mv map_reg

crates/debug/src/write_debuginfo.rs

@@ -1,6 +1,6 @@
 use faerie::artifact::{Decl, SectionKind};
 use faerie::*;
-use gimli::write::{Address, Dwarf, EndianVec, Result, Sections, Writer};
+use gimli::write::{Address, DebugFrame, Dwarf, EndianVec, FrameTable, Result, Sections, Writer};
 use gimli::{RunTimeEndian, SectionId};
 
 #[derive(Clone)]
@@ -24,6 +24,7 @@ pub fn emit_dwarf(
     artifact: &mut Artifact,
     mut dwarf: Dwarf,
     symbol_resolver: &dyn SymbolResolver,
+    frames: Option<FrameTable>,
 ) -> anyhow::Result<()> {
     let endian = RunTimeEndian::Little;
 
@@ -52,6 +53,30 @@ pub fn emit_dwarf(
         }
         Ok(())
     })?;
+
+    if let Some(frames) = frames {
+        let mut debug_frame = DebugFrame::from(WriterRelocate::new(endian, symbol_resolver));
+        frames.write_debug_frame(&mut debug_frame).unwrap();
+        artifact.declare_with(
+            SectionId::DebugFrame.name(),
+            Decl::section(SectionKind::Debug),
+            debug_frame.writer.take(),
+        )?;
+        for reloc in &debug_frame.relocs {
+            artifact.link_with(
+                faerie::Link {
+                    from: SectionId::DebugFrame.name(),
+                    to: &reloc.name,
+                    at: u64::from(reloc.offset),
+                },
+                faerie::Reloc::Debug {
+                    size: reloc.size,
+                    addend: reloc.addend as i32,
+                },
+            )?;
+        }
+    }
+
     Ok(())
 }