[PATCH] D79743: [clang][asm goto][slh] Warn if asm goto + SLH

[Zola Bridges via Phabricator via cfe-commits]

zbrid updated this revision to Diff 264740.
zbrid marked an inline comment as done.
zbrid added a comment.

Update to emit the warning in the parser


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D79743/new/

https://reviews.llvm.org/D79743

Files:
  clang/include/clang/Basic/DiagnosticCommonKinds.td
  clang/lib/Parse/ParseStmtAsm.cpp
  clang/test/Parser/asm-goto-slh.cpp


Index: clang/test/Parser/asm-goto-slh.cpp
===================================================================
--- /dev/null
+++ clang/test/Parser/asm-goto-slh.cpp
@@ -0,0 +1,5 @@
+// RUN: %clang_cc1 %s -mspeculative-load-hardening -triple x86_64-pc-linux-gnu -emit-llvm -S
+
+void f() {
+  __asm goto("movl %ecx, %edx"); // expected-warning {{Speculative load hardening does not protect functions with asm goto}}
+}
Index: clang/lib/Parse/ParseStmtAsm.cpp
===================================================================
--- clang/lib/Parse/ParseStmtAsm.cpp
+++ clang/lib/Parse/ParseStmtAsm.cpp
@@ -729,6 +729,9 @@
   if (parseGNUAsmQualifierListOpt(GAQ))
     return StmtError();
 
+  if (GAQ.isGoto() && getLangOpts().SpeculativeLoadHardening)
+    Diag(Loc, diag::warn_slh_does_not_support_asm_goto);
+
   BalancedDelimiterTracker T(*this, tok::l_paren);
   T.consumeOpen();
 
Index: clang/include/clang/Basic/DiagnosticCommonKinds.td
===================================================================
--- clang/include/clang/Basic/DiagnosticCommonKinds.td
+++ clang/include/clang/Basic/DiagnosticCommonKinds.td
@@ -243,6 +243,9 @@
   def warn_stack_clash_protection_inline_asm : Warning<
     "Unable to protect inline asm that clobbers stack pointer against stack clash">,
     InGroup<DiagGroup<"stack-protector">>;
+
+  def warn_slh_does_not_support_asm_goto : Warning<
+    "Speculative load hardening does not protect functions with asm goto">, InGroup<DiagGroup<"slh-asm-goto">>;
 }
 
 // Sema && Serialization


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