Force column info only for direct inlined functions. This should strike

the balance between expected behavior and compatibility with the gdb
testsuite.
(GDB gets confused if we break an expression into multiple debug
stmts so we enable this behavior only for inlined functions. For the
full experience people can still use -gcolumn-info.)

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@177164 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/CGExpr.cpp

@@ -2857,9 +2857,11 @@ RValue CodeGenFunction::EmitCallExpr(const CallExpr *E,
                                      ReturnValueSlot ReturnValue) {
   if (CGDebugInfo *DI = getDebugInfo()) {
     SourceLocation Loc = E->getLocStart();
-    DI->EmitLocation(Builder, Loc,
-      /* Force column info to be generated so we can differentiate
-         multiple call sites on the same line in the debug info. */ true);
+    // Force column info to be generated so we can differentiate
+    // multiple call sites on the same line in the debug info.
+    const FunctionDecl* Callee = E->getDirectCallee();
+    bool ForceColumnInfo = Callee && Callee->isInlineSpecified();
+    DI->EmitLocation(Builder, Loc, ForceColumnInfo);
   }
 
   // Builtins never have block type.

test/CodeGenCXX/debug-info-same-line.cpp

@@ -47,12 +47,15 @@ main(int argc, char const *argv[])
 {
 
     int array[3];
+    int n;
 
     array[0] = foo (1238, 78392);
     array[1] = foo (379265, 23674);
     array[2] = foo (872934, 234);
 
-    return 0;
+    n = strange_max(array[0], strange_max(array[1], array[2]));
+
+    return n & 0xf;
 }
 
 // CHECK: define {{.*}} @_Z3fooii
@@ -79,3 +82,17 @@ main(int argc, char const *argv[])
 // CHECK:     call void @llvm.dbg.declare(metadata !{i32* %{{.*}}}, metadata ![[B_MD]]), !dbg !{{.*}}
 // result
 // CHECK: call void @llvm.dbg.declare
+
+// CHECK: define {{.*}} @main
+// CHECK: call {{.*}} @_Z3fooii
+// CHECK: call {{.*}} @_Z3fooii
+// CHECK: call {{.*}} @_Z3fooii
+// CHECK: store
+// CHECK: getelementptr
+// We want to see the same !dbg node for non-inlined functions. 
+// Needed for GDB compatibility.
+// CHECK: load {{.*}} !dbg ![[DBG:.*]]
+// CHECK: load {{.*}} !dbg ![[DBG]]
+// CHECK: load {{.*}} !dbg ![[DBG]]
+// CHECK: call {{.*}} @_Z11strange_maxii(i32 %{{.*}}, i32 %{{.*}}), !dbg ![[DBG]]
+// CHECK: call {{.*}} @_Z11strange_maxii(i32 %{{.*}}, i32 %{{.*}}), !dbg ![[DBG]]