Rollup merge of #81618 - bjorn3:sync_cg_clif-2021-02-01, r=bjorn3

[rust.git] / src / allocator.rs

diff --git a/src/allocator.rs b/src/allocator.rs
index 894e47dd439caa4518348011d20775be1f005e55..6c5916550ff639f52a99c14bd8ce34c0321f4da0 100644 (file)
--- a/src/allocator.rs
+++ b/src/allocator.rs
@@ -1,21 +1,15 @@
-// Copyright 2017 The Rust Project Developers. See the COPYRIGHT
-// file at the top-level directory of this distribution and at
-// http://rust-lang.org/COPYRIGHT.
-//
-// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
-// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
-// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
-// option. This file may not be copied, modified, or distributed
-// except according to those terms.
+//! Allocator shim
+// Adapted from rustc
 
 use crate::prelude::*;
 
 use rustc_ast::expand::allocator::{AllocatorKind, AllocatorTy, ALLOCATOR_METHODS};
+use rustc_span::symbol::sym;
 
 /// Returns whether an allocator shim was created
 pub(crate) fn codegen(
     tcx: TyCtxt<'_>,
-    module: &mut Module<impl Backend + 'static>,
+    module: &mut impl Module,
     unwind_context: &mut UnwindContext<'_>,
 ) -> bool {
     let any_dynamic_crate = tcx.dependency_formats(LOCAL_CRATE).iter().any(|(_, list)| {
@@ -33,7 +27,7 @@ pub(crate) fn codegen(
 }
 
 fn codegen_inner(
-    module: &mut Module<impl Backend + 'static>,
+    module: &mut impl Module,
     unwind_context: &mut UnwindContext<'_>,
     kind: AllocatorKind,
 ) {
@@ -94,10 +88,9 @@ fn codegen_inner(
                 .collect::<Vec<Value>>();
 
             let callee_func_ref = module.declare_func_in_func(callee_func_id, &mut bcx.func);
-
             let call_inst = bcx.ins().call(callee_func_ref, &args);
-
             let results = bcx.inst_results(call_inst).to_vec(); // Clone to prevent borrow error
+
             bcx.ins().return_(&results);
             bcx.seal_all_blocks();
             bcx.finalize();
@@ -111,4 +104,50 @@ fn codegen_inner(
             .unwrap();
         unwind_context.add_function(func_id, &ctx, module.isa());
     }
+
+    let sig = Signature {
+        call_conv: CallConv::triple_default(module.isa().triple()),
+        params: vec![AbiParam::new(usize_ty), AbiParam::new(usize_ty)],
+        returns: vec![],
+    };
+
+    let callee_name = kind.fn_name(sym::oom);
+    //eprintln!("Codegen allocator shim {} -> {} ({:?} -> {:?})", caller_name, callee_name, sig.params, sig.returns);
+
+    let func_id = module
+        .declare_function("__rust_alloc_error_handler", Linkage::Export, &sig)
+        .unwrap();
+
+    let callee_func_id = module
+        .declare_function(&callee_name, Linkage::Import, &sig)
+        .unwrap();
+
+    let mut ctx = Context::new();
+    ctx.func = Function::with_name_signature(ExternalName::user(0, 0), sig);
+    {
+        let mut func_ctx = FunctionBuilderContext::new();
+        let mut bcx = FunctionBuilder::new(&mut ctx.func, &mut func_ctx);
+
+        let block = bcx.create_block();
+        bcx.switch_to_block(block);
+        let args = (&[usize_ty, usize_ty])
+            .iter()
+            .map(|&ty| bcx.append_block_param(block, ty))
+            .collect::<Vec<Value>>();
+
+        let callee_func_ref = module.declare_func_in_func(callee_func_id, &mut bcx.func);
+        bcx.ins().call(callee_func_ref, &args);
+
+        bcx.ins().trap(TrapCode::UnreachableCodeReached);
+        bcx.seal_all_blocks();
+        bcx.finalize();
+    }
+    module
+        .define_function(
+            func_id,
+            &mut ctx,
+            &mut cranelift_codegen::binemit::NullTrapSink {},
+        )
+        .unwrap();
+    unwind_context.add_function(func_id, &ctx, module.isa());
 }