[Sema] Don't crash trying to diagnose abs called on a pointer type
Clang tries to figure out if a call to abs is suspicious by looking
through implicit casts to look at the underlying, implicitly converted
type.
Interestingly, C has implicit conversions from pointer-ish types like
function to less exciting types like int. This trips up our 'abs'
checker because it doesn't know which variant of 'abs' is appropriate.
Instead, diagnose 'abs' called on function types upfront. This sort of
thing is highly suspicious and is likely indicative of a missing
pointer dereference/function call/array index operation.
This fixes PR25532.
llvm-svn: 253156
diff --git a/clang/include/clang/Basic/DiagnosticSemaKinds.td b/clang/include/clang/Basic/DiagnosticSemaKinds.td
index bf1101f..d0518b9 100644
--- a/clang/include/clang/Basic/DiagnosticSemaKinds.td
+++ b/clang/include/clang/Basic/DiagnosticSemaKinds.td
@@ -67,6 +67,9 @@
"when argument is of %select{integer|floating point|complex}2 type">,
InGroup<AbsoluteValue>;
def note_replace_abs_function : Note<"use function '%0' instead">;
+def warn_pointer_abs : Warning<
+ "taking the absolute value of %select{pointer|function|array}0 type %1 is suspicious">,
+ InGroup<AbsoluteValue>;
def warn_infinite_recursive_function : Warning<
"all paths through this function will call itself">,
diff --git a/clang/lib/Sema/SemaChecking.cpp b/clang/lib/Sema/SemaChecking.cpp
index 5c94227..2494016 100644
--- a/clang/lib/Sema/SemaChecking.cpp
+++ b/clang/lib/Sema/SemaChecking.cpp
@@ -5085,6 +5085,19 @@
return;
}
+ // Taking the absolute value of a pointer is very suspicious, they probably
+ // wanted to index into an array, dereference a pointer, call a function, etc.
+ if (ArgType->isPointerType() || ArgType->canDecayToPointerType()) {
+ unsigned DiagType = 0;
+ if (ArgType->isFunctionType())
+ DiagType = 1;
+ else if (ArgType->isArrayType())
+ DiagType = 2;
+
+ Diag(Call->getExprLoc(), diag::warn_pointer_abs) << DiagType << ArgType;
+ return;
+ }
+
// std::abs has overloads which prevent most of the absolute value problems
// from occurring.
if (IsStdAbs)
diff --git a/clang/test/Sema/warn-absolute-value.c b/clang/test/Sema/warn-absolute-value.c
index 70601db..109d515 100644
--- a/clang/test/Sema/warn-absolute-value.c
+++ b/clang/test/Sema/warn-absolute-value.c
@@ -1,5 +1,5 @@
-// RUN: %clang_cc1 -triple i686-pc-linux-gnu -fsyntax-only -verify %s -Wabsolute-value
-// RUN: %clang_cc1 -triple i686-pc-linux-gnu -fsyntax-only %s -Wabsolute-value -fdiagnostics-parseable-fixits 2>&1 | FileCheck %s
+// RUN: %clang_cc1 -triple i686-pc-linux-gnu -fsyntax-only -verify %s -Wabsolute-value -Wno-int-conversion
+// RUN: %clang_cc1 -triple i686-pc-linux-gnu -fsyntax-only %s -Wabsolute-value -Wno-int-conversion -fdiagnostics-parseable-fixits 2>&1 | FileCheck %s
int abs(int);
long int labs(long int);
@@ -780,3 +780,19 @@
// CHECK: fix-it:"{{.*}}":{[[@LINE-3]]:9-[[@LINE-3]]:24}:""
}
+long long test_array() {
+ return llabs((long long[]){1});
+ // expected-warning@-1 {{absolute value of array type}}
+}
+long long test_function_pointer() {
+ return llabs(&test_function_pointer);
+ // expected-warning@-1 {{absolute value of pointer type}}
+}
+long long test_void_pointer(void *x) {
+ return llabs(x);
+ // expected-warning@-1 {{absolute value of pointer type}}
+}
+long long test_function() {
+ return llabs(test_function);
+ // expected-warning@-1 {{absolute value of function type}}
+}