From d255d70e7a6a84c82cc74f968f529f42dd40b8ce Mon Sep 17 00:00:00 2001
From: Hugues de Valon <hugues.devalon@arm.com>
Date: Tue, 29 Sep 2020 12:20:56 +0100
Subject: [PATCH] Update LLVM and add Unsupported diagnostic

Secure entry functions do not support if arguments are passed on the
stack. An "unsupported" diagnostic will be emitted by LLVM if that is
the case.
This commits adds support in Rust for that diagnostic so that an error
will be output if that is the case!

Signed-off-by: Hugues de Valon <hugues.devalon@arm.com>
---
 compiler/rustc_codegen_llvm/src/back/write.rs      | 7 +++++++
 compiler/rustc_codegen_llvm/src/llvm/diagnostic.rs | 2 ++
 compiler/rustc_codegen_llvm/src/llvm/ffi.rs        | 1 +
 compiler/rustc_llvm/llvm-wrapper/RustWrapper.cpp   | 3 +++
 4 files changed, 13 insertions(+)

diff --git a/compiler/rustc_codegen_llvm/src/back/write.rs b/compiler/rustc_codegen_llvm/src/back/write.rs
index 937821e9d4f..f35c1016f86 100644
--- a/compiler/rustc_codegen_llvm/src/back/write.rs
+++ b/compiler/rustc_codegen_llvm/src/back/write.rs
@@ -344,6 +344,13 @@ unsafe extern "C" fn diagnostic_handler(info: &DiagnosticInfo, user: *mut c_void
             .expect("non-UTF8 diagnostic");
             diag_handler.warn(&msg);
         }
+        llvm::diagnostic::Unsupported(diagnostic_ref) => {
+            let msg = llvm::build_string(|s| {
+                llvm::LLVMRustWriteDiagnosticInfoToString(diagnostic_ref, s)
+            })
+            .expect("non-UTF8 diagnostic");
+            diag_handler.err(&msg);
+        }
         llvm::diagnostic::UnknownDiagnostic(..) => {}
     }
 }
diff --git a/compiler/rustc_codegen_llvm/src/llvm/diagnostic.rs b/compiler/rustc_codegen_llvm/src/llvm/diagnostic.rs
index 47f5c94e70c..ccd3e42e458 100644
--- a/compiler/rustc_codegen_llvm/src/llvm/diagnostic.rs
+++ b/compiler/rustc_codegen_llvm/src/llvm/diagnostic.rs
@@ -118,6 +118,7 @@ pub enum Diagnostic<'ll> {
     InlineAsm(InlineAsmDiagnostic<'ll>),
     PGO(&'ll DiagnosticInfo),
     Linker(&'ll DiagnosticInfo),
+    Unsupported(&'ll DiagnosticInfo),
 
     /// LLVM has other types that we do not wrap here.
     UnknownDiagnostic(&'ll DiagnosticInfo),
@@ -159,6 +160,7 @@ impl Diagnostic<'ll> {
 
             Dk::PGOProfile => PGO(di),
             Dk::Linker => Linker(di),
+            Dk::Unsupported => Unsupported(di),
 
             _ => UnknownDiagnostic(di),
         }
diff --git a/compiler/rustc_codegen_llvm/src/llvm/ffi.rs b/compiler/rustc_codegen_llvm/src/llvm/ffi.rs
index 45c5f56f447..af3f3e7aa03 100644
--- a/compiler/rustc_codegen_llvm/src/llvm/ffi.rs
+++ b/compiler/rustc_codegen_llvm/src/llvm/ffi.rs
@@ -483,6 +483,7 @@ pub enum DiagnosticKind {
     OptimizationFailure,
     PGOProfile,
     Linker,
+    Unsupported,
 }
 
 /// LLVMRustDiagnosticLevel
diff --git a/compiler/rustc_llvm/llvm-wrapper/RustWrapper.cpp b/compiler/rustc_llvm/llvm-wrapper/RustWrapper.cpp
index e85a9b76380..9f8ea7f43d8 100644
--- a/compiler/rustc_llvm/llvm-wrapper/RustWrapper.cpp
+++ b/compiler/rustc_llvm/llvm-wrapper/RustWrapper.cpp
@@ -1171,6 +1171,7 @@ enum class LLVMRustDiagnosticKind {
   OptimizationFailure,
   PGOProfile,
   Linker,
+  Unsupported,
 };
 
 static LLVMRustDiagnosticKind toRust(DiagnosticKind Kind) {
@@ -1197,6 +1198,8 @@ static LLVMRustDiagnosticKind toRust(DiagnosticKind Kind) {
     return LLVMRustDiagnosticKind::PGOProfile;
   case DK_Linker:
     return LLVMRustDiagnosticKind::Linker;
+  case DK_Unsupported:
+    return LLVMRustDiagnosticKind::Unsupported;
   default:
     return (Kind >= DK_FirstRemark && Kind <= DK_LastRemark)
                ? LLVMRustDiagnosticKind::OptimizationRemarkOther