Higuoxing updated this revision to Diff 151633.
https://reviews.llvm.org/D47687
Files:
lib/Sema/SemaExpr.cpp
test/Sema/parentheses.c
Index: test/Sema/parentheses.c
===================================================================
--- test/Sema/parentheses.c
+++ test/Sema/parentheses.c
@@ -14,6 +14,15 @@
if ((i = 4)) {}
}
+// testing macros
+// nesting macros testing
+#define NESTING_VOID(cond) ( (void)(cond) )
+#define NESTING_VOID_WRAPPER(op0, op1, x, y, z) ( (void)(x op0 y op1 z) )
+
+// non-nesting macros
+#define NON_NESTING_VOID_0(cond) ( (void)(cond) )
+#define NON_NESTING_VOID_1(op0, op1, x, y, z) ( (void)(x op0 y op1 z) )
+
void bitwise_rel(unsigned i) {
(void)(i & 0x2 == 0); // expected-warning {{& has lower precedence than ==}} \
// expected-note{{place parentheses around the '==' expression to silence this warning}} \
@@ -96,6 +105,115 @@
(void)(i && i || 0); // no warning.
(void)(0 || i && i); // no warning.
+
+ //===----------------------------------------------------------------------
+ // Logical operator in macros
+ //===----------------------------------------------------------------------
+
+ NON_NESTING_VOID_0(i && i || i); // expected-warning {{'&&' within '||'}} \
+ // expected-note {{place parentheses around the '&&' expression to silence this warning}}
+ NON_NESTING_VOID_0((i && i) || i); // no warning.
+
+ // NON_NESTING_VOID_1(&&, ||, i, i, i);
+ // will be expanded to:
+ // i && i || i
+ // ^ arg position 2 (i)
+ // ^ arg position 0 (&&)
+ // ^ arg position 3 (||) should not be checked becaues `op ||` and nothing from same arg position
+ // ^ arg position 1 (i)
+ // ^ arg position 4 (i)
+ NON_NESTING_VOID_1(&&, ||, i, i, i); // no warning.
+ NESTING_VOID_WRAPPER(&&, ||, i, i, i); // no warning.
+
+ // NON_NESTING_VOID_1(&&, ||, i && i || i, i, i);
+ // will be expanded to:
+ // i && i || i && i || i
+ // ^---------^ arg position 2 (i && i || i) should be checked because `op ||` and `lhs (i && i)` from same arg position
+ // ^ arg position 0 (&&)
+ // ^ arg position 3 (i)
+ // ^ arg position 1 (||) should not be checked because `op ||` and nothing from same arg position
+ // ^ arg position 4 (i)
+ NON_NESTING_VOID_1(&&, ||, i && i || i, i, i); // expected-warning {{'&&' within '||'}} \
+ // expected-note {{place parentheses around the '&&' expression to silence this warning}}
+ NON_NESTING_VOID_1(&&, ||, (i && i) || i, i, i); // no warning.
+
+ // same as this one
+ NESTING_VOID_WRAPPER(&&, ||, i && i || i, i, i); // expected-warning {{'&&' within '||'}} \
+ // expected-note {{place parentheses around the '&&' expression to silence this warning}}
+ NESTING_VOID_WRAPPER(&&, ||, (i && i) || i, i, i); // no warning.
+
+ // NON_NESTING_VOID_1(&&, ||, i, i && i || i, i);
+ // will be expanded to:
+ // i && i && i || i || i
+ // ^ arg position 2 (i)
+ // ^ arg position 0 (&&)
+ // ^---------^ arg position 3 (i && i || i) should be checked because `op ||` and `lhs i && i` from same arg position
+ // ^ arg position 1 (||) should not be checked because `op ||` and nothing from same arg postion
+ // ^ arg position 4 (i)
+ NON_NESTING_VOID_1(&&, ||, i, i && i || i, i); // expected-warning {{'&&' within '||'}} \
+ // expected-note {{place parentheses around the '&&' expression to silence this warning}}
+ NON_NESTING_VOID_1(&&, ||, i, (i && i) || i, i); // no warning.
+
+ // same as this one
+ NESTING_VOID_WRAPPER(&&, ||, i, i && i || i, i); // expected-warning {{'&&' within '||'}} \
+ // expected-note {{place parentheses around the '&&' expression to silence this warning}}
+ NESTING_VOID_WRAPPER(&&, ||, i, (i && i) || i, i); // no warning.
+
+ // NON_NESTING_VOID_1(&&, ||, i, i, i && i || i);
+ // will be expanded to:
+ // i && i || i && i || i
+ // ^ arg positon 2 (i)
+ // ^ arg position 0 (&&)
+ // ^ arg position 3 (i)
+ // ^ arg position 1 (||) should not be checked because `op ||` and nothing from same arg position
+ // ^---------^ arg position 4 (i && i || i) should not be checked because `op ||` and nothing from same arg position
+ NON_NESTING_VOID_1(&&, ||, i, i, i && i || i); // no warning.
+ NESTING_VOID_WRAPPER(&&, ||, i, i, i && i || i); // no warning.
+
+ // NON_NESTING_VOID_1(&&, ||, i || i && i, i, i);
+ // will be expanded to:
+ // i || i && i && i || i
+ // ^---------^ arg position 2 (i || i && i) should not be checked because `op ||` and its rhs are not from same arg position
+ // ^ arg position 0 (&&)
+ // ^ arg position 3 (i)
+ // ^ arg position 1 (||) should not be checked because `op ||` and its lhs are not from same arg position
+ // ^ arg position 4 (i)
+ NON_NESTING_VOID_1(&&, ||, i || i && i, i, i); // no warning.
+ NESTING_VOID_WRAPPER(&&, ||, i || i && i, i, i); // no warning.
+
+ // NON_NESTING_VOID_1(&&, ||, i, i || i && i, i);
+ // will be expanded to:
+ // i && i || i && i || i
+ // ^ arg position 2 (i)
+ // ^ arg position 0 (&&)
+ // ^---------^ arg position 3 (i || i && i) should be checked because `op ||` and its rhs are from same arg position
+ // ^ arg position 1 (||) shoud not be checked because `op ||` and its lhs are not from same arg position
+ // ^ arg position 4 (i)
+ NON_NESTING_VOID_1(&&, ||, i, i || i && i, i); // expected-warning {{'&&' within '||'}} \
+ // expected-note {{place parentheses around the '&&' expression to silence this warning}}
+ NON_NESTING_VOID_1(&&, ||, i, i || (i && i), i); // no warning.
+
+ // same as this one
+ NESTING_VOID_WRAPPER(&&, ||, i, i || i && i, i); // expected-warning {{'&&' within '||'}} \
+ // expected-note {{place parentheses around the '&&' expression to silence this warning}}
+ NESTING_VOID_WRAPPER(&&, ||, i, i || (i && i), i); // no warning.
+
+ // NON_NESTING_VOID_1(&&, ||, i, i, i || i && i);
+ // will be expanded to:
+ // i && i || i || i && i
+ // ^ arg position 2 (i)
+ // ^ arg position 0 (&&)
+ // ^ arg position 3 (i)
+ // ^ arg position 1 (||) should not be checked because `op ||` and its rhs are not from same arg position
+ // ^----------^ arg position 4 (i || i && i) should be checked because `op ||` and its rhs are from same arg position
+ NON_NESTING_VOID_1(&&, ||, i, i, i || i && i); // expected-warning {{'&&' within '||'}} \
+ // expected-note {{place parentheses around the '&&' expression to silence this warning}}
+ NON_NESTING_VOID_1(&&, ||, i, i, i || (i && i)); // no warning.
+
+ // same as this one
+ NESTING_VOID_WRAPPER(&&, ||, i, i, i || i && i); // expected-warning {{'&&' within '||'}} \
+ // expected-note {{place parentheses around the '&&' expression to silence this warning}}
+ NESTING_VOID_WRAPPER(&&, ||, i, i, i || (i && i)); // no warning.
}
_Bool someConditionFunc();
Index: lib/Sema/SemaExpr.cpp
===================================================================
--- lib/Sema/SemaExpr.cpp
+++ lib/Sema/SemaExpr.cpp
@@ -12233,6 +12233,31 @@
}
}
+/// Look for '&&' in the righ or left hand of a '||' expr
+static void DiagnoseLogicalAndInLogicalOr(Sema &Self, SourceLocation OpLoc,
+ Expr *LHSExpr, Expr *RHSExpr) {
+ SourceManager &SM = Self.getSourceManager();
+ if (!OpLoc.isMacroID()) {
+ DiagnoseLogicalAndInLogicalOrLHS(Self, OpLoc, LHSExpr, RHSExpr);
+ DiagnoseLogicalAndInLogicalOrRHS(Self, OpLoc, LHSExpr, RHSExpr);
+ } else {
+ SourceLocation OpExpansionLoc;
+ if (!SM.isMacroArgExpansion(OpLoc, &OpExpansionLoc))
+ return;
+
+ SourceLocation ExprExpansionLoc;
+ // LHS and operator are from same arg position of macro function
+ if (SM.isMacroArgExpansion(LHSExpr->getExprLoc(), &ExprExpansionLoc) &&
+ OpExpansionLoc == ExprExpansionLoc)
+ DiagnoseLogicalAndInLogicalOrLHS(Self, OpLoc, LHSExpr, RHSExpr);
+
+ // RHS and operator are from same arg position of macro function
+ if (SM.isMacroArgExpansion(RHSExpr->getExprLoc(), &ExprExpansionLoc) &&
+ OpExpansionLoc == ExprExpansionLoc)
+ DiagnoseLogicalAndInLogicalOrRHS(Self, OpLoc, LHSExpr, RHSExpr);
+ }
+}
+
/// Look for bitwise op in the left or right hand of a bitwise op with
/// lower precedence and emit a diagnostic together with a fixit hint that wraps
/// the '&' expression in parentheses.
@@ -12310,10 +12335,8 @@
// Warn about arg1 || arg2 && arg3, as GCC 4.3+ does.
// We don't warn for 'assert(a || b && "bad")' since this is safe.
- if (Opc == BO_LOr && !OpLoc.isMacroID()/* Don't warn in macros. */) {
- DiagnoseLogicalAndInLogicalOrLHS(Self, OpLoc, LHSExpr, RHSExpr);
- DiagnoseLogicalAndInLogicalOrRHS(Self, OpLoc, LHSExpr, RHSExpr);
- }
+ if (Opc == BO_LOr)
+ DiagnoseLogicalAndInLogicalOr(Self, OpLoc, LHSExpr, RHSExpr);
if ((Opc == BO_Shl && LHSExpr->getType()->isIntegralType(Self.getASTContext()))
|| Opc == BO_Shr) {
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