r357686 - [CodeComplete] Fix crash when completing ObjC block parameter with a broken type

[Sam McCall via cfe-commits]

Author: sammccall
Date: Thu Apr  4 04:34:18 2019
New Revision: 357686

URL: http://llvm.org/viewvc/llvm-project?rev=357686&view=rev
Log:
[CodeComplete] Fix crash when completing ObjC block parameter with a broken type

Summary:
The fix isn't great, but it's hard to fix properly because the completion
code sensibly uses ParmVarDecl to represent parameters, but the AST-building
code sensibly doesn't synthesize them if the type is broken.
Also this case is apparently really rare, so it's probably not worth bending
over backwards for.

Reviewers: ilya-biryukov

Subscribers: javed.absar, kristof.beyls, arphaman, cfe-commits

Tags: #clang

Differential Revision: https://reviews.llvm.org/D60258

Modified:
    cfe/trunk/lib/Sema/SemaCodeComplete.cpp
    cfe/trunk/test/Index/complete-blocks.m

Modified: cfe/trunk/lib/Sema/SemaCodeComplete.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/Sema/SemaCodeComplete.cpp?rev=357686&r1=357685&r2=357686&view=diff
==============================================================================
--- cfe/trunk/lib/Sema/SemaCodeComplete.cpp (original)
+++ cfe/trunk/lib/Sema/SemaCodeComplete.cpp Thu Apr  4 04:34:18 2019
@@ -2605,6 +2605,11 @@ static std::string
 FormatFunctionParameter(const PrintingPolicy &Policy, const ParmVarDecl *Param,
                         bool SuppressName = false, bool SuppressBlock = false,
                         Optional<ArrayRef<QualType>> ObjCSubsts = None) {
+  // Params are unavailable in FunctionTypeLoc if the FunctionType is invalid.
+  // It would be better to pass in the param Type, which is usually avaliable.
+  // But this case is rare, so just pretend we fell back to int as elsewhere.
+  if (!Param)
+    return "int";
   bool ObjCMethodParam = isa<ObjCMethodDecl>(Param->getDeclContext());
   if (Param->getType()->isDependentType() ||
       !Param->getType()->isBlockPointerType()) {

Modified: cfe/trunk/test/Index/complete-blocks.m
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/test/Index/complete-blocks.m?rev=357686&r1=357685&r2=357686&view=diff
==============================================================================
--- cfe/trunk/test/Index/complete-blocks.m (original)
+++ cfe/trunk/test/Index/complete-blocks.m Thu Apr  4 04:34:18 2019
@@ -50,6 +50,15 @@ void test_f2(I1 *o) {
   [o method7:0];
 }
 
+// Crash regression test. Param info for broken function types isn't available.
+typedef UnresolvedType *(^XXX)(float);
+ at interface Foo
+-(void) foo:(XXX)arg;
+ at end
+void testUnresolved(Foo* f) {
+  [f foo:0];
+}
+
 // RUN: c-index-test -code-completion-at=%s:8:1 %s | FileCheck -check-prefix=CHECK-CC1 %s
 // CHECK-CC1: FunctionDecl:{ResultType void}{TypedText f}{LeftParen (}{Placeholder ^int(int x, int y)block}{RightParen )} (50)
 // CHECK-CC1: FunctionDecl:{ResultType void}{TypedText g}{LeftParen (}{Placeholder ^(float f, double d)b}{RightParen )} (50)
@@ -74,3 +83,6 @@ void test_f2(I1 *o) {
 // CHECK-CC7: FunctionDecl:{ResultType void}{TypedText f2}{LeftParen (}{Placeholder ^int(int x, int y)block}{RightParen )} (50)
 // RUN: c-index-test -code-completion-at=%s:50:6 %s | FileCheck -check-prefix=CHECK-CC8 %s
 // CHECK-CC8: ObjCInstanceMethodDecl:{ResultType id}{TypedText method7:}{Placeholder ^int(int x, int y)b} (35)
+
+// RUN: c-index-test -code-completion-at=%s:59:6 %s | FileCheck -check-prefix=CHECK-CC9 %s
+// CHECK-CC9: ObjCInstanceMethodDecl:{ResultType void}{TypedText foo:}{Placeholder ^int *(int)arg} (35)