[clang] Add -ffinite-loops & -fno-finite-loops options.

This patch adds 2 new options to control when Clang adds `mustprogress`:

  1. -ffinite-loops: assume all loops are finite; mustprogress is added
     to all loops, regardless of the selected language standard.
  2. -fno-finite-loops: assume no loop is finite; mustprogress is not
     added to any loop or function. We could add mustprogress to
     functions without loops, but we would have to detect that in Clang,
     which is probably not worth it.

Reviewed By: jdoerfert

Differential Revision: https://reviews.llvm.org/D96419

1 files changed, 14 insertions, 0 deletions

diff --git a/clang/lib/CodeGen/CodeGenFunction.h b/clang/lib/CodeGen/CodeGenFunction.h
index dd77d70..ff98751 100644
--- a/clang/lib/CodeGen/CodeGenFunction.h
+++ b/clang/lib/CodeGen/CodeGenFunction.h
@@ -507,12 +507,26 @@ public:
 
   /// True if the C++ Standard Requires Progress.
   bool CPlusPlusWithProgress() {
+    if (CGM.getCodeGenOpts().getFiniteLoops() ==
+        CodeGenOptions::FiniteLoopsKind::Never)
+      return false;
+    if (CGM.getCodeGenOpts().getFiniteLoops() ==
+        CodeGenOptions::FiniteLoopsKind::Never)
+      return false;
+
     return getLangOpts().CPlusPlus11 || getLangOpts().CPlusPlus14 ||
            getLangOpts().CPlusPlus17 || getLangOpts().CPlusPlus20;
   }
 
   /// True if the C Standard Requires Progress.
   bool CWithProgress() {
+    if (CGM.getCodeGenOpts().getFiniteLoops() ==
+        CodeGenOptions::FiniteLoopsKind::Always)
+      return true;
+    if (CGM.getCodeGenOpts().getFiniteLoops() ==
+        CodeGenOptions::FiniteLoopsKind::Never)
+      return false;
+
     return getLangOpts().C11 || getLangOpts().C17 || getLangOpts().C2x;
   }