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Bug 520117: [C++14] Return type deduction deduces wrong type for

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parenthesized expressions in return

This patchset fixes 520117 and adjusts the value category of expressions
of kind E1.E2 to be standard (DR616) compliant.

Change-Id: I9a5cde805f2d0b39a2d263dbc3dcbefd3ba21930
Signed-off-by: Felix Morgner <fmorgner@hsr.ch>
This commit is contained in:
Felix Morgner 2017-07-24 21:29:38 +02:00 • committed by Nathan Ridge
parent 0757b45da5
commit 2272a74f38
5 changed files with 27 additions and 7 deletions
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17
core/org.eclipse.cdt.core.tests/parser/org/eclipse/cdt/core/parser/tests/ast2/cxx14/ReturnTypeDeductionTests.java
View file

@ -313,4 +313,21 @@ public class ReturnTypeDeductionTests extends AST2CPPTestBase {
BindingAssertionHelper helper = getAssertionHelper();
helper.assertVariableType("waldo", CommonCPPTypes.int_);
}
// struct A {
// decltype(auto) f() { return (var); }
// int var{};
// };
public void testParenthesizedIdIsLValueReference_520117() throws Exception {
assertReturnType("f", CommonCPPTypes.referenceToInt);
}
// struct s{ int v{}; };
//
// decltype(auto) f() {
// return (s{}.v);
// }
public void testParenthesizedXValueIsRValueReference_520117() throws Exception {
assertReturnType("f", CommonCPPTypes.rvalueReferenceToInt);
}
}

2
core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/dom/parser/cpp/CPPASTUnaryExpression.java
View file

@ -215,8 +215,6 @@ public class CPPASTUnaryExpression extends ASTNode implements ICPPASTUnaryExpres
return EvalFixed.INCOMPLETE;
final ICPPEvaluation nestedEval = fOperand.getEvaluation();
if (fOperator == op_bracketedPrimary)
return nestedEval;
if (nestedEval.isFunctionSet() && fOperator == op_amper) {
return nestedEval;

5
core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/dom/parser/cpp/semantics/EvalMemberAccess.java
View file

@ -343,8 +343,9 @@ public class EvalMemberAccess extends CPPDependentEvaluation {
if (fMember instanceof ICPPField && !((ICPPField) fMember).isStatic()) {
if (fIsPointerDeref)
return LVALUE;
return fOwnerValueCategory;
// Since C++11 (DR616), E1.E2 is an xvalue iff. E1 is not an lvalue and E2
// has non reference type and designates a non-static data-member.
return fOwnerValueCategory == LVALUE ? LVALUE : XVALUE;
}
return LVALUE;
}

6
core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/dom/parser/cpp/semantics/EvalUnary.java
View file

@ -18,6 +18,7 @@ import static org.eclipse.cdt.core.dom.ast.IASTExpression.ValueCategory.LVALUE;
import static org.eclipse.cdt.core.dom.ast.IASTExpression.ValueCategory.PRVALUE;
import static org.eclipse.cdt.core.dom.ast.IASTUnaryExpression.op_alignOf;
import static org.eclipse.cdt.core.dom.ast.IASTUnaryExpression.op_amper;
import static org.eclipse.cdt.core.dom.ast.IASTUnaryExpression.op_bracketedPrimary;
import static org.eclipse.cdt.core.dom.ast.IASTUnaryExpression.op_minus;
import static org.eclipse.cdt.core.dom.ast.IASTUnaryExpression.op_noexcept;
import static org.eclipse.cdt.core.dom.ast.IASTUnaryExpression.op_not;
@ -362,6 +363,9 @@ public class EvalUnary extends CPPDependentEvaluation {
case op_prefixDecr:
case op_prefixIncr:
return LVALUE;
case op_bracketedPrimary:
// [expr.prim.paren]
return fArgument.getValueCategory();
default:
return PRVALUE;
}
@ -460,6 +464,8 @@ public class EvalUnary extends CPPDependentEvaluation {
return EvalPointer.createFromAddress(evalRef);
}
return evalUnary;
} else if (fOperator == op_bracketedPrimary) {
return updateable != null ? updateable : fixed;
} else if (isModifyingOperation(fOperator)) {
if (fixed instanceof EvalPointer) {
EvalPointer evalPointer = (EvalPointer) fixed;

4
core/org.eclipse.cdt.ui.tests/ui/org/eclipse/cdt/ui/tests/text/SemanticHighlightingTest.java
View file

@ -810,9 +810,7 @@ public class SemanticHighlightingTest extends TestCase {
// };
// int main() { //$functionDeclaration
// Iter it; //$class,localVariableDeclaration
// // TODO: The fact that the opening parenthesis gets its own overloadedOperator
// // semantic highlighting is an (unrelated) bug.
// 1 + (*it).waldo; //$overloadedOperator,overloadedOperator,localVariable,field
// 1 + (*it).waldo; //$overloadedOperator,localVariable,field
// }
public void testOverloadedOperatorStar_539535() throws Exception {
makeAssertions();