[PATCH] D137714: Do not merge traps in functions annotated optnone

[Henrik G Olsson via Phabricator via cfe-commits]

hnrklssn updated this revision to Diff 474811.
hnrklssn added a comment.

No longer reorders annotations to occur before codegen. Instead EmitTrapCheck checks the function declaration for OptimizeNoneAttr.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D137714/new/

https://reviews.llvm.org/D137714

Files:
  clang/lib/CodeGen/CGExpr.cpp
  clang/test/CodeGen/ubsan-trap-debugloc.c


Index: clang/test/CodeGen/ubsan-trap-debugloc.c
===================================================================
--- clang/test/CodeGen/ubsan-trap-debugloc.c
+++ clang/test/CodeGen/ubsan-trap-debugloc.c
@@ -7,4 +7,16 @@
   a = a + 1;
 }
 
+void bar(volatile int a) __attribute__((optnone)) {
+  // CHECK: call void @llvm.ubsantrap(i8 0){{.*}} !dbg [[LOC2:![0-9]+]]
+  // CHECK: call void @llvm.ubsantrap(i8 0){{.*}} !dbg [[LOC3:![0-9]+]]
+  a = a + 1;
+  a = a + 1;
+}
+
+// With optimisations enabled the traps are merged and need to share a debug location
 // CHECK: [[LOC]] = !DILocation(line: 0
+
+// With optimisations disabled the traps are not merged and retain accurate debug locations
+// CHECK: [[LOC2]] = !DILocation(line: 13, column: 9
+// CHECK: [[LOC3]] = !DILocation(line: 14, column: 9
Index: clang/lib/CodeGen/CGExpr.cpp
===================================================================
--- clang/lib/CodeGen/CGExpr.cpp
+++ clang/lib/CodeGen/CGExpr.cpp
@@ -3545,7 +3545,8 @@
     TrapBBs.resize(CheckHandlerID + 1);
   llvm::BasicBlock *&TrapBB = TrapBBs[CheckHandlerID];
 
-  if (!CGM.getCodeGenOpts().OptimizationLevel || !TrapBB) {
+  if (!CGM.getCodeGenOpts().OptimizationLevel || !TrapBB ||
+      (CurCodeDecl && CurCodeDecl->hasAttr<OptimizeNoneAttr>())) {
     TrapBB = createBasicBlock("trap");
     Builder.CreateCondBr(Checked, Cont, TrapBB);
     EmitBlock(TrapBB);


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