Method apply_func_rename

cranelift/filetests/src/function_runner.rs:211–252

Renames the function to its new [UserExternalName], as well as any other function that it may reference. We have to do this since the JIT cannot link Testcase functions.

(
        &self,
        mut func: Function,
        defined_func: &DefinedFunction,
    )

    ///
    /// We have to do this since the JIT cannot link Testcase functions.
    fn apply_func_rename(
        &self,
        mut func: Function,
        defined_func: &DefinedFunction,
    ) -> Result<Function> {
        // First, rename the function
        let func_original_name = func.name;
        func.name = UserFuncName::User(defined_func.new_name.clone());

        // Rename any functions that it references
        // Do this in stages to appease the borrow checker
        let mut redefines = Vec::with_capacity(func.dfg.ext_funcs.len());
        for (ext_ref, ext_func) in &func.dfg.ext_funcs {
            let old_name = match &ext_func.name {
                ExternalName::TestCase(tc) => UserFuncName::Testcase(tc.clone()),
                ExternalName::User(username) => {
                    UserFuncName::User(func.params.user_named_funcs()[*username].clone())
                }
                // The other cases don't need renaming, so lets just continue...
                _ => continue,
            };

            let target_df = self.defined_functions.get(&old_name).ok_or(anyhow!(
                "Undeclared function {} is referenced by {}!",
                &old_name,
                &func_original_name
            ))?;

            redefines.push((ext_ref, target_df.new_name.clone()));
        }

        // Now register the redefines
        for (ext_ref, new_name) in redefines.into_iter() {
            // Register the new name in the func, so that we can get a reference to it.
            let new_name_ref = func.params.ensure_user_func_name(new_name);

            // Finally rename the ExtFunc
            func.dfg.ext_funcs[ext_ref].name = ExternalName::User(new_name_ref);
        }

        Ok(func)
    }

    /// Defines the body of a function
    pub fn define_function(