Add support for inline attribute

Author: antoyo

Cargo.lock

@@ -25,7 +25,7 @@ master = ["gccjit/master"]
 gccjit = { git = "https://github.com/antoyo/gccjit.rs" }
 
 # Local copy.
-#gccjit = { path = "../gccjit.rs" }
+# gccjit = { path = "../gccjit.rs" }
 
 smallvec = { version = "1.6.1", features = ["union", "may_dangle"] }
 

Cargo.toml

@@ -1,10 +1,11 @@
 #[cfg(feature="master")]
 use gccjit::FnAttribute;
 use gccjit::Function;
-use rustc_attr::InstructionSetAttr;
+use rustc_attr::{InlineAttr, InstructionSetAttr};
 use rustc_codegen_ssa::target_features::tied_target_features;
 use rustc_data_structures::fx::FxHashMap;
 use rustc_middle::ty;
+use rustc_middle::middle::codegen_fn_attrs::CodegenFnAttrFlags;
 use rustc_session::Session;
 use rustc_span::symbol::sym;
 use smallvec::{smallvec, SmallVec};
@@ -67,6 +68,23 @@ fn to_gcc_features<'a>(sess: &Session, s: &'a str) -> SmallVec<[&'a str; 2]> {
     }
 }
 
+/// Get GCC attribute for the provided inline heuristic.
+#[inline]
+fn inline_attr<'gcc, 'tcx>(cx: &CodegenCx<'gcc, 'tcx>, inline: InlineAttr) -> Option<FnAttribute<'gcc>> {
+    match inline {
+        InlineAttr::Hint => Some(FnAttribute::Inline),
+        InlineAttr::Always => Some(FnAttribute::AlwaysInline),
+        InlineAttr::Never => {
+            if cx.sess().target.arch != "amdgpu" {
+                Some(FnAttribute::NoInline)
+            } else {
+                None
+            }
+        }
+        InlineAttr::None => None,
+    }
+}
+
 /// Composite function which sets GCC attributes for function depending on its AST (`#[attribute]`)
 /// attributes.
 pub fn from_fn_attrs<'gcc, 'tcx>(
@@ -77,6 +95,21 @@ pub fn from_fn_attrs<'gcc, 'tcx>(
 ) {
     let codegen_fn_attrs = cx.tcx.codegen_fn_attrs(instance.def_id());
 
+    // TODO: disable for libgccjit12?
+    let inline =
+        if codegen_fn_attrs.flags.contains(CodegenFnAttrFlags::NAKED) {
+            InlineAttr::Never
+        }
+        else if codegen_fn_attrs.inline == InlineAttr::None && instance.def.requires_inline(cx.tcx) {
+            InlineAttr::Hint
+        }
+        else {
+            codegen_fn_attrs.inline
+        };
+    if let Some(attr) = inline_attr(cx, inline) {
+        func.add_attribute(attr);
+    }
+
     let function_features =
         codegen_fn_attrs.target_features.iter().map(|features| features.as_str()).collect::<Vec<&str>>();
 

src/attributes.rs

@@ -110,6 +110,8 @@ impl CodegenBackend for GccCodegenBackend {
     }
 
     fn init(&self, sess: &Session) {
+        #[cfg(feature="master")]
+        gccjit::set_global_personality_function_name(b"rust_eh_personality\0");
         if sess.lto() != Lto::No {
             sess.emit_warning(LTONotSupported {});
         }