Pass Module to UnwindContext

Once writing the LSDA, it will need access to the Module to get a
reference to the personality function and to define a data object for
the LSDA.

Part of #1567

Author: bjorn3

Diff for: src/debuginfo/unwind.rs

@@ -1,7 +1,6 @@
 //! Unwind info generation (`.eh_frame`)
 
 use cranelift_codegen::ir::Endianness;
-use cranelift_codegen::isa::TargetIsa;
 use cranelift_codegen::isa::unwind::UnwindInfo;
 use cranelift_object::ObjectProduct;
 use gimli::RunTimeEndian;
@@ -18,14 +17,14 @@ pub(crate) struct UnwindContext {
 }
 
 impl UnwindContext {
-    pub(crate) fn new(isa: &dyn TargetIsa, pic_eh_frame: bool) -> Self {
-        let endian = match isa.endianness() {
+    pub(crate) fn new(module: &mut dyn Module, pic_eh_frame: bool) -> Self {
+        let endian = match module.isa().endianness() {
             Endianness::Little => RunTimeEndian::Little,
             Endianness::Big => RunTimeEndian::Big,
         };
         let mut frame_table = FrameTable::default();
 
-        let cie_id = if let Some(mut cie) = isa.create_systemv_cie() {
+        let cie_id = if let Some(mut cie) = module.isa().create_systemv_cie() {
             if pic_eh_frame {
                 cie.fde_address_encoding =
                     gimli::DwEhPe(gimli::DW_EH_PE_pcrel.0 | gimli::DW_EH_PE_sdata4.0);
@@ -38,8 +37,15 @@ impl UnwindContext {
         UnwindContext { endian, frame_table, cie_id }
     }
 
-    pub(crate) fn add_function(&mut self, func_id: FuncId, context: &Context, isa: &dyn TargetIsa) {
-        if let target_lexicon::OperatingSystem::MacOSX { .. } = isa.triple().operating_system {
+    pub(crate) fn add_function(
+        &mut self,
+        module: &mut dyn Module,
+        func_id: FuncId,
+        context: &Context,
+    ) {
+        if let target_lexicon::OperatingSystem::MacOSX { .. } =
+            module.isa().triple().operating_system
+        {
             // The object crate doesn't currently support DW_GNU_EH_PE_absptr, which macOS
             // requires for unwinding tables. In addition on arm64 it currently doesn't
             // support 32bit relocations as we currently use for the unwinding table.
@@ -48,7 +54,7 @@ impl UnwindContext {
         }
 
         let unwind_info = if let Some(unwind_info) =
-            context.compiled_code().unwrap().create_unwind_info(isa).unwrap()
+            context.compiled_code().unwrap().create_unwind_info(module.isa()).unwrap()
         {
             unwind_info
         } else {

Diff for: src/unwind_module.rs

@@ -17,8 +17,8 @@ pub(crate) struct UnwindModule<T> {
 }
 
 impl<T: Module> UnwindModule<T> {
-    pub(crate) fn new(module: T, pic_eh_frame: bool) -> Self {
-        let unwind_context = UnwindContext::new(module.isa(), pic_eh_frame);
+    pub(crate) fn new(mut module: T, pic_eh_frame: bool) -> Self {
+        let unwind_context = UnwindContext::new(&mut module, pic_eh_frame);
         UnwindModule { module, unwind_context }
     }
 }
@@ -37,7 +37,7 @@ impl UnwindModule<cranelift_jit::JITModule> {
         self.module.finalize_definitions().unwrap();
         let prev_unwind_context = std::mem::replace(
             &mut self.unwind_context,
-            UnwindContext::new(self.module.isa(), false),
+            UnwindContext::new(&mut self.module, false),
         );
         unsafe { prev_unwind_context.register_jit(&self.module) };
     }
@@ -94,7 +94,7 @@ impl<T: Module> Module for UnwindModule<T> {
         ctrl_plane: &mut ControlPlane,
     ) -> ModuleResult<()> {
         self.module.define_function_with_control_plane(func, ctx, ctrl_plane)?;
-        self.unwind_context.add_function(func, ctx, self.module.isa());
+        self.unwind_context.add_function(&mut self.module, func, ctx);
         Ok(())
     }