From: Eric Christopher <echristo@apple.com>
Date: Tue, 10 Apr 2012 18:20:19 +0000 (+0000)
Subject: For debug and coverage analysis if we're not optimizing go ahead
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=c07833795aa6e569de5bb90945f5017b9969288d;p=clang

For debug and coverage analysis if we're not optimizing go ahead
and emit a relatively empty block for a plain break statement. This
enables us to track where we went through a switch.

PR9796 & rdar://11215207

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@154420 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/CodeGen/CGStmt.cpp b/lib/CodeGen/CGStmt.cpp
index f442bc2367..bf42dcb8e2 100644
--- a/lib/CodeGen/CGStmt.cpp
+++ b/lib/CodeGen/CGStmt.cpp
@@ -892,7 +892,7 @@ void CodeGenFunction::EmitCaseStmt(const CaseStmt &S) {
 
   // If the body of the case is just a 'break', and if there was no fallthrough,
   // try to not emit an empty block.
-  if (isa<BreakStmt>(S.getSubStmt())) {
+  if ((CGM.getCodeGenOpts().OptimizationLevel > 0) && isa<BreakStmt>(S.getSubStmt())) {
     JumpDest Block = BreakContinueStack.back().BreakBlock;
     
     // Only do this optimization if there are no cleanups that need emitting.
diff --git a/test/CodeGen/debug-line-1.c b/test/CodeGen/debug-line-1.c
new file mode 100644
index 0000000000..b31de55c8c
--- /dev/null
+++ b/test/CodeGen/debug-line-1.c
@@ -0,0 +1,19 @@
+// RUN: %clang_cc1 -triple x86_64-unk-unk -o - -emit-llvm -g %s | FileCheck %s
+// PR9796
+
+// Check to make sure that we emit the block for the break so that we can count the line.
+// CHECK: sw.bb:                                            ; preds = %entry
+// CHECK: br label %sw.epilog, !dbg !21
+  
+extern int atoi(const char *);
+
+int f(char* arg) {
+  int x = atoi(arg);
+  
+  switch(x) {
+    case 1:
+      break;
+  }
+
+  return 0;
+}
diff --git a/test/CodeGen/switch-dce.c b/test/CodeGen/switch-dce.c
index bbb5f7e5aa..a18d3bc89e 100644
--- a/test/CodeGen/switch-dce.c
+++ b/test/CodeGen/switch-dce.c
@@ -216,32 +216,19 @@ void test12() {
   }
 }
 
-
-// rdar://9289524 - Check that the empty cases don't produce an empty block.
+// Verify that case 42 only calls test14 once.
 // CHECK: @test13
-// CHECK: switch 
-// CHECK:     i32 42, label [[EPILOG:%[0-9.a-z]+]]
-// CHECK:     i32 11, label [[EPILOG]]
+// CHECK: call void @test13(i32 97)
+// CHECK-NEXT: br label %[[EPILOG2:[0-9.a-z]+]]
+// CHECK: [[EPILOG2]]
+// CHECK-NEXT: br label [[EPILOG:%[0-9.a-z]+]]
+// CHECK: call void @test13(i32 42)
+// CHECK-NEXT: br label [[EPILOG]]
 void test13(int x) {
   switch (x) {
-  case 42: break;  // No empty block please.
-  case 11: break;  // No empty block please.
-  default: test13(42); break;
-  }
-}
-
-
-// Verify that case 42 only calls test14 once.
-// CHECK: @test14
-// CHECK: call void @test14(i32 97)
-// CHECK-NEXT: br label [[EPILOG2:%[0-9.a-z]+]]
-// CHECK: call void @test14(i32 42)
-// CHECK-NEXT: br label [[EPILOG2]]
-void test14(int x) {
-  switch (x) {
-    case 42: test14(97);  // fallthrough
+    case 42: test13(97);  // fallthrough
     case 11: break;
-    default: test14(42); break;
+    default: test13(42); break;
   }
 }