[update_cc_test_checks] Don't attach CHECK lines to function declarations

Previously we were adding the CHECK lines to both definitions and
declarations. Update the JSON AST dump parsing code to skip all
FunctionDecls without an "inner" node (i.e. no body).

Reviewed By: MaskRay, greened
Differential Revision: https://reviews.llvm.org/D73708

Author: arichardson

llvm/test/tools/UpdateTestChecks/update_cc_test_checks/Inputs/def-and-decl.c

@@ -0,0 +1,17 @@
+// Check that the CHECK lines are generated before the definition and not the declaration
+// RUN: %clang_cc1 -triple x86_64-unknown-linux-gnu %s -emit-llvm -o - | FileCheck %s
+
+int foo();
+
+void empty_function();
+
+int main() {
+  empty_function();
+  return foo();
+}
+
+int foo() {
+  return 1;
+}
+
+void empty_function() {}

llvm/test/tools/UpdateTestChecks/update_cc_test_checks/Inputs/def-and-decl.c.expected

@@ -0,0 +1,34 @@
+// NOTE: Assertions have been autogenerated by utils/update_cc_test_checks.py
+// Check that the CHECK lines are generated before the definition and not the declaration
+// RUN: %clang_cc1 -triple x86_64-unknown-linux-gnu %s -emit-llvm -o - | FileCheck %s
+
+int foo();
+
+void empty_function();
+
+// CHECK-LABEL: @main(
+// CHECK-NEXT:  entry:
+// CHECK-NEXT:    [[RETVAL:%.*]] = alloca i32, align 4
+// CHECK-NEXT:    store i32 0, i32* [[RETVAL]], align 4
+// CHECK-NEXT:    call void @empty_function()
+// CHECK-NEXT:    [[CALL:%.*]] = call i32 @foo()
+// CHECK-NEXT:    ret i32 [[CALL]]
+//
+int main() {
+  empty_function();
+  return foo();
+}
+
+// CHECK-LABEL: @foo(
+// CHECK-NEXT:  entry:
+// CHECK-NEXT:    ret i32 1
+//
+int foo() {
+  return 1;
+}
+
+// CHECK-LABEL: @empty_function(
+// CHECK-NEXT:  entry:
+// CHECK-NEXT:    ret void
+//
+void empty_function() {}

llvm/test/tools/UpdateTestChecks/update_cc_test_checks/def-and-decl.test

@@ -0,0 +1,7 @@
+## Test that CHECK lines are generated before the definion and not the declaration
+
+# RUN: cp %S/Inputs/def-and-decl.c %t.c && %update_cc_test_checks %t.c
+# RUN: diff -u %S/Inputs/def-and-decl.c.expected %t.c
+## Check that re-running update_cc_test_checks doesn't change the output
+# RUN: %update_cc_test_checks %t.c
+# RUN: diff -u %S/Inputs/def-and-decl.c.expected %t.c

llvm/utils/update_cc_test_checks.py

@@ -76,6 +76,10 @@ def parse_clang_ast_json(node):
     if line is None:
       common.debug('Skipping function without line number:', node['name'], '@', node['loc'])
       return
+    # If there is no 'inner' object, it is a function declaration -> skip
+    if 'inner' not in node:
+      common.debug('Skipping function without body:', node['name'], '@', node['loc'])
+      return
     spell = node['name']
     mangled = node.get('mangledName', spell)
     ret[int(line)-1] = (spell, mangled)