xgupta updated this revision to Diff 494631.
xgupta added a comment.
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Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D142609/new/
https://reviews.llvm.org/D142609
Files:
clang/lib/Sema/SemaExpr.cpp
clang/test/C/drs/dr4xx.c
clang/test/CXX/dcl.dcl/dcl.spec/dcl.constexpr/p5.cpp
clang/test/Parser/cxx2a-concept-declaration.cpp
clang/test/Sema/exprs.c
clang/test/SemaCXX/expressions.cpp
clang/test/SemaCXX/warn-unsequenced.cpp
clang/test/SemaTemplate/dependent-expr.cpp
Index: clang/test/SemaTemplate/dependent-expr.cpp
===================================================================
--- clang/test/SemaTemplate/dependent-expr.cpp
+++ clang/test/SemaTemplate/dependent-expr.cpp
@@ -43,7 +43,9 @@
namespace PR7724 {
template<typename OT> int myMethod()
- { return 2 && sizeof(OT); }
+ { return 2 && sizeof(OT); } // expected-warning {{use of logical '&&' with constant operand}} \
+ // expected-note {{use '&' for a bitwise operation}} \
+ // expected-note {{remove constant to silence this warning}}
}
namespace test4 {
Index: clang/test/SemaCXX/warn-unsequenced.cpp
===================================================================
--- clang/test/SemaCXX/warn-unsequenced.cpp
+++ clang/test/SemaCXX/warn-unsequenced.cpp
@@ -76,15 +76,37 @@
(xs[2] && (a = 0)) + a; // cxx11-warning {{unsequenced modification and access to 'a'}}
// cxx17-warning@-1 {{unsequenced modification and access to 'a'}}
- (0 && (a = 0)) + a; // ok
+
+ (0 && (a = 0)) + a; // cxx11-warning {{use of logical '&&' with constant operand}}
+ // cxx11-note@-1 {{use '&' for a bitwise operation}}
+ // cxx11-note@-2 {{remove constant to silence this warning}}
+ // cxx17-warning@-3 {{use of logical '&&' with constant operand}}
+ // cxx17-note@-4 {{use '&' for a bitwise operation}}
+ // cxx17-note@-5 {{remove constant to silence this warning}}
+
(1 && (a = 0)) + a; // cxx11-warning {{unsequenced modification and access to 'a'}}
// cxx17-warning@-1 {{unsequenced modification and access to 'a'}}
+ // cxx11-warning@-2 {{use of logical '&&' with constant operand}}
+ // cxx11-note@-3 {{use '&' for a bitwise operation}}
+ // cxx11-note@-4 {{remove constant to silence this warning}}
+ // cxx17-warning@-5 {{use of logical '&&' with constant operand}}
+ // cxx17-note@-6 {{use '&' for a bitwise operation}}
+ // cxx17-note@-7 {{remove constant to silence this warning}}
+
(xs[3] || (a = 0)) + a; // cxx11-warning {{unsequenced modification and access to 'a'}}
// cxx17-warning@-1 {{unsequenced modification and access to 'a'}}
(0 || (a = 0)) + a; // cxx11-warning {{unsequenced modification and access to 'a'}}
// cxx17-warning@-1 {{unsequenced modification and access to 'a'}}
- (1 || (a = 0)) + a; // ok
+ // cxx11-warning@-2 {{use of logical '||' with constant operand}}
+ // cxx11-note@-3 {{use '|' for a bitwise operation}}
+ // cxx17-warning@-4 {{use of logical '||' with constant operand}}
+ // cxx17-note@-5 {{use '|' for a bitwise operation}}
+ (1 || (a = 0)) + a; // cxx11-warning {{use of logical '||' with constant operand}}
+ // cxx11-note@-1 {{use '|' for a bitwise operation}}
+ // cxx17-warning@-2 {{use of logical '||' with constant operand}}
+ // cxx17-note@-3 {{use '|' for a bitwise operation}}
+
(xs[4] ? a : ++a) + a; // cxx11-warning {{unsequenced modification and access to 'a'}}
// cxx17-warning@-1 {{unsequenced modification and access to 'a'}}
Index: clang/test/SemaCXX/expressions.cpp
===================================================================
--- clang/test/SemaCXX/expressions.cpp
+++ clang/test/SemaCXX/expressions.cpp
@@ -44,6 +44,9 @@
return x && 4; // expected-warning {{use of logical '&&' with constant operand}} \
// expected-note {{use '&' for a bitwise operation}} \
// expected-note {{remove constant to silence this warning}}
+ return 4 && x; // expected-warning {{use of logical '&&' with constant operand}} \
+ // expected-note {{use '&' for a bitwise operation}} \
+ // expected-note {{remove constant to silence this warning}}
return x && sizeof(int) == 4; // no warning, RHS is logical op.
return x && true;
@@ -66,6 +69,8 @@
// expected-note {{use '|' for a bitwise operation}}
return x || 5; // expected-warning {{use of logical '||' with constant operand}} \
// expected-note {{use '|' for a bitwise operation}}
+ return 5 || x; // expected-warning {{use of logical '||' with constant operand}} \
+ // expected-note {{use '|' for a bitwise operation}}
return x && 0; // expected-warning {{use of logical '&&' with constant operand}} \
// expected-note {{use '&' for a bitwise operation}} \
// expected-note {{remove constant to silence this warning}}
Index: clang/test/Sema/exprs.c
===================================================================
--- clang/test/Sema/exprs.c
+++ clang/test/Sema/exprs.c
@@ -212,6 +212,10 @@
// expected-note {{use '&' for a bitwise operation}} \
// expected-note {{remove constant to silence this warning}}
+ return 4 && x; // expected-warning {{use of logical '&&' with constant operand}} \
+ // expected-note {{use '&' for a bitwise operation}} \
+ // expected-note {{remove constant to silence this warning}}
+
return x && sizeof(int) == 4; // no warning, RHS is logical op.
// no warning, this is an idiom for "true" in old C style.
@@ -223,6 +227,9 @@
// expected-note {{use '|' for a bitwise operation}}
return x || 5; // expected-warning {{use of logical '||' with constant operand}} \
// expected-note {{use '|' for a bitwise operation}}
+ return 5 || x; // expected-warning {{use of logical '||' with constant operand}} \
+ // expected-note {{use '|' for a bitwise operation}}
+
return x && 0;
return x && 1;
return x && -1; // expected-warning {{use of logical '&&' with constant operand}} \
Index: clang/test/Parser/cxx2a-concept-declaration.cpp
===================================================================
--- clang/test/Parser/cxx2a-concept-declaration.cpp
+++ clang/test/Parser/cxx2a-concept-declaration.cpp
@@ -79,6 +79,11 @@
// expected-warning@-1{{use of logical '&&' with constant operand}}
// expected-note@-2{{use '&' for a bitwise operation}}
// expected-note@-3{{remove constant to silence this warning}}
+// expected-warning@-4{{use of logical '&&' with constant operand}}
+// expected-note@-5{{use '&' for a bitwise operation}}
+// expected-note@-6{{remove constant to silence this warning}}
+
+
template<typename T> concept C17 = T{};
static_assert(!C17<bool>);
template<typename T> concept C18 = (bool&&)true;
Index: clang/test/CXX/dcl.dcl/dcl.spec/dcl.constexpr/p5.cpp
===================================================================
--- clang/test/CXX/dcl.dcl/dcl.spec/dcl.constexpr/p5.cpp
+++ clang/test/CXX/dcl.dcl/dcl.spec/dcl.constexpr/p5.cpp
@@ -72,9 +72,15 @@
constexpr int LogicalAnd1(int n) { return n && (throw, 0); } // ok
constexpr int LogicalAnd2(int n) { return 1 && (throw, 0); } // expected-error {{never produces}} expected-note {{subexpression}}
+ // expected-warning@-1 {{use of logical '&&' with constant operand}}
+ // expected-note@-2 {{use '&' for a bitwise operation}}
+ // expected-note@-3 {{remove constant to silence this warning}}
constexpr int LogicalOr1(int n) { return n || (throw, 0); } // ok
constexpr int LogicalOr2(int n) { return 0 || (throw, 0); } // expected-error {{never produces}} expected-note {{subexpression}}
+ // expected-warning@-1 {{use of logical '||' with constant operand}}
+ // expected-note@-2 {{use '|' for a bitwise operation}}
+
constexpr int Conditional1(bool b, int n) { return b ? n : ng; } // ok
constexpr int Conditional2(bool b, int n) { return b ? n * ng : n + ng; } // expected-error {{never produces}} expected-note {{both arms of conditional operator are unable to produce a constant expression}}
Index: clang/test/C/drs/dr4xx.c
===================================================================
--- clang/test/C/drs/dr4xx.c
+++ clang/test/C/drs/dr4xx.c
@@ -308,7 +308,9 @@
case (int){ 2 }: break; /* expected-warning {{expression is not an integer constant expression; folding it to a constant is a GNU extension}}
c89only-warning {{compound literals are a C99-specific feature}}
*/
- case 12 || main(): break; /* expected-warning {{expression is not an integer constant expression; folding it to a constant is a GNU extension}} */
+ case 12 || main(): break; /* expected-warning {{expression is not an integer constant expression; folding it to a constant is a GNU extension}}
+ expected-warning {{use of logical '||' with constant operand}} \
+ expected-note {{use '|' for a bitwise operation}} */
}
}
Index: clang/lib/Sema/SemaExpr.cpp
===================================================================
--- clang/lib/Sema/SemaExpr.cpp
+++ clang/lib/Sema/SemaExpr.cpp
@@ -13634,6 +13634,41 @@
}
}
}
+ // Diagnose cases where the user write a logical and/or but probably meant a
+ // bitwise one. We do this when the RHS is a non-bool integer and the LHS
+ // is a constant.
+ if (!EnumConstantInBoolContext && RHS.get()->getType()->isIntegerType() &&
+ !RHS.get()->getType()->isBooleanType() &&
+ LHS.get()->getType()->isIntegerType() && !LHS.get()->isValueDependent() &&
+ // Don't warn in macros or template instantiations.
+ !Loc.isMacroID() && !inTemplateInstantiation()) {
+ // If the LHS can be constant folded, and if it constant folds to something
+ // that isn't 0 or 1 (which indicate a potential logical operation that
+ // happened to fold to true/false) then warn.
+ // Parens on the LHS are ignored.
+ Expr::EvalResult EVResult;
+ if (LHS.get()->EvaluateAsInt(EVResult, Context)) {
+ llvm::APSInt Result = EVResult.Val.getInt();
+ if ((getLangOpts().Bool && !LHS.get()->getType()->isBooleanType() &&
+ !LHS.get()->getExprLoc().isMacroID()) ||
+ (Result != 0 && Result != 1)) {
+ Diag(Loc, diag::warn_logical_instead_of_bitwise)
+ << LHS.get()->getSourceRange() << (Opc == BO_LAnd ? "&&" : "||");
+ // Suggest replacing the logical operator with the bitwise version
+ Diag(Loc, diag::note_logical_instead_of_bitwise_change_operator)
+ << (Opc == BO_LAnd ? "&" : "|")
+ << FixItHint::CreateReplacement(
+ SourceRange(Loc, getLocForEndOfToken(Loc)),
+ Opc == BO_LAnd ? "&" : "|");
+ if (Opc == BO_LAnd)
+ // Suggest replacing "kNonZero" && Foo() with "Foo()"
+ Diag(Loc, diag::note_logical_instead_of_bitwise_remove_constant)
+ << FixItHint::CreateRemoval(
+ SourceRange(getLocForEndOfToken(RHS.get()->getEndLoc()),
+ LHS.get()->getEndLoc()));
+ }
+ }
+ }
if (!Context.getLangOpts().CPlusPlus) {
// OpenCL v1.1 s6.3.g: The logical operators and (&&), or (||) do
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