tmroeder created this revision.
tmroeder added reviewers: shafik, a_sidorin, martong, aaron.ballman, rnk.
tmroeder added a project: clang.
Herald added a reviewer: a.sidorin.
This allows ASTs to be merged when they contain ChooseExpr (the GNU
__builtin_choose_expr construction). This is needed, for example, for
cross-CTU analysis of C code that makes use of __builtin_choose_expr.
The node is already supported in the AST, but it didn't have a matcher
in ASTMatchers. So, this change adds the matcher and adds support to
ASTImporter.
This was originally reviewed and approved in
https://reviews.llvm.org/D58292 and submitted as r354832. It was
reverted in r354839 due to failures on the Windows CI builds.
This version fixes the test failures on Windows, caused by differences
in the behavior of -fms-compatibility between Linux and MSVC builds. In
MSVC builds, -fms-compatibility delays template evaluation for the C++
test case in clang/unittests/AST/ASTImporter.cpp, and that causes the
matcher to fail to match chooseExpr().
The only difference between this patch and r354839 is that the unit test
now checks for "-fms-compatibility" and treats it like
"-fdelayed-template-parsing": it doesn't try to match chooseExpr().
Repository:
rG LLVM Github Monorepo
https://reviews.llvm.org/D58663
Files:
clang/docs/LibASTMatchersReference.html
clang/include/clang/ASTMatchers/ASTMatchers.h
clang/lib/AST/ASTImporter.cpp
clang/lib/ASTMatchers/ASTMatchersInternal.cpp
clang/lib/ASTMatchers/Dynamic/Registry.cpp
clang/test/ASTMerge/choose-expr/Inputs/choose.c
clang/test/ASTMerge/choose-expr/test.c
clang/unittests/AST/ASTImporterTest.cpp
clang/unittests/ASTMatchers/ASTMatchersNodeTest.cpp
Index: clang/unittests/ASTMatchers/ASTMatchersNodeTest.cpp
===================================================================
--- clang/unittests/ASTMatchers/ASTMatchersNodeTest.cpp
+++ clang/unittests/ASTMatchers/ASTMatchersNodeTest.cpp
@@ -754,6 +754,11 @@
EXPECT_TRUE(matches("int* i = nullptr;", cxxNullPtrLiteralExpr()));
}
+TEST(Matcher, ChooseExpr) {
+ EXPECT_TRUE(matchesC("void f() { (void)__builtin_choose_expr(1, 2, 3); }",
+ chooseExpr()));
+}
+
TEST(Matcher, GNUNullExpr) {
EXPECT_TRUE(matches("int* i = __null;", gnuNullExpr()));
}
Index: clang/unittests/AST/ASTImporterTest.cpp
===================================================================
--- clang/unittests/AST/ASTImporterTest.cpp
+++ clang/unittests/AST/ASTImporterTest.cpp
@@ -563,6 +563,36 @@
stringLiteral(hasType(asString("const char [7]"))))));
}
+TEST_P(ImportExpr, ImportChooseExpr) {
+ MatchVerifier<Decl> Verifier;
+
+ // This case tests C code that is not condition-dependent and has a true
+ // condition.
+ testImport(
+ "void declToImport() { (void)__builtin_choose_expr(1, 2, 3); }",
+ Lang_C, "", Lang_C, Verifier,
+ functionDecl(hasDescendant(chooseExpr())));
+
+ ArgVector Args = getExtraArgs();
+ BindableMatcher<Decl> Matcher =
+ functionTemplateDecl(hasDescendant(chooseExpr()));
+
+ // Don't try to match the template contents if template parsing. The
+ // -fms-compatibility flag delays template parsing on Windows.
+ if (llvm::find(Args, "-fdelayed-template-parsing") != Args.end() ||
+ llvm::find(Args, "-fms-compatibility") != Args.end()) {
+ Matcher = functionTemplateDecl();
+ }
+
+ // Make sure that uses of (void)__builtin_choose_expr with dependent types in
+ // the condition are handled properly. This test triggers an assertion if the
+ // ASTImporter incorrectly tries to access isConditionTrue() when
+ // isConditionDependent() is true.
+ testImport("template<int N> void declToImport() { "
+ "(void)__builtin_choose_expr(N, 1, 0); }",
+ Lang_CXX, "", Lang_CXX, Verifier, Matcher);
+}
+
TEST_P(ImportExpr, ImportGNUNullExpr) {
MatchVerifier<Decl> Verifier;
testImport(
@@ -1312,6 +1342,27 @@
ASSERT_EQ(ToTemplated1, ToTemplated);
}
+TEST_P(ASTImporterOptionSpecificTestBase, ImportChooseExpr) {
+ // This tests the import of isConditionTrue directly to make sure the importer
+ // gets it right.
+ Decl *From, *To;
+ std::tie(From, To) = getImportedDecl(
+ "void declToImport() { (void)__builtin_choose_expr(1, 0, 1); }",
+ Lang_C, "", Lang_C);
+
+ auto ToResults = match(chooseExpr().bind("choose"), To->getASTContext());
+ auto FromResults = match(chooseExpr().bind("choose"), From->getASTContext());
+
+ const ChooseExpr *FromChooseExpr =
+ selectFirst<ChooseExpr>("choose", FromResults);
+ ASSERT_TRUE(FromChooseExpr);
+
+ const ChooseExpr *ToChooseExpr = selectFirst<ChooseExpr>("choose", ToResults);
+ ASSERT_TRUE(ToChooseExpr);
+
+ EXPECT_EQ(FromChooseExpr->isConditionTrue(), ToChooseExpr->isConditionTrue());
+}
+
TEST_P(ASTImporterOptionSpecificTestBase,
ImportFunctionWithBackReferringParameter) {
Decl *From, *To;
Index: clang/test/ASTMerge/choose-expr/test.c
===================================================================
--- /dev/null
+++ clang/test/ASTMerge/choose-expr/test.c
@@ -0,0 +1,4 @@
+// RUN: %clang_cc1 -std=c11 -emit-pch -o %t.ast %S/Inputs/choose.c
+// RUN: %clang_cc1 -std=c11 -ast-merge %t.ast -fsyntax-only -verify %s
+// expected-no-diagnostics
+
Index: clang/test/ASTMerge/choose-expr/Inputs/choose.c
===================================================================
--- /dev/null
+++ clang/test/ASTMerge/choose-expr/Inputs/choose.c
@@ -0,0 +1,2 @@
+_Static_assert(__builtin_choose_expr(1, 1, 0), "Incorrect semantics of __builtin_choose_expr");
+_Static_assert(__builtin_choose_expr(0, 0, 1), "Incorrect semantics of __builtin_choose_expr");
Index: clang/lib/ASTMatchers/Dynamic/Registry.cpp
===================================================================
--- clang/lib/ASTMatchers/Dynamic/Registry.cpp
+++ clang/lib/ASTMatchers/Dynamic/Registry.cpp
@@ -147,6 +147,7 @@
REGISTER_MATCHER(caseStmt);
REGISTER_MATCHER(castExpr);
REGISTER_MATCHER(characterLiteral);
+ REGISTER_MATCHER(chooseExpr);
REGISTER_MATCHER(classTemplateDecl);
REGISTER_MATCHER(classTemplateSpecializationDecl);
REGISTER_MATCHER(complexType);
Index: clang/lib/ASTMatchers/ASTMatchersInternal.cpp
===================================================================
--- clang/lib/ASTMatchers/ASTMatchersInternal.cpp
+++ clang/lib/ASTMatchers/ASTMatchersInternal.cpp
@@ -727,6 +727,7 @@
compoundLiteralExpr;
const internal::VariadicDynCastAllOfMatcher<Stmt, CXXNullPtrLiteralExpr>
cxxNullPtrLiteralExpr;
+const internal::VariadicDynCastAllOfMatcher<Stmt, ChooseExpr> chooseExpr;
const internal::VariadicDynCastAllOfMatcher<Stmt, GNUNullExpr> gnuNullExpr;
const internal::VariadicDynCastAllOfMatcher<Stmt, AtomicExpr> atomicExpr;
const internal::VariadicDynCastAllOfMatcher<Stmt, StmtExpr> stmtExpr;
Index: clang/lib/AST/ASTImporter.cpp
===================================================================
--- clang/lib/AST/ASTImporter.cpp
+++ clang/lib/AST/ASTImporter.cpp
@@ -552,6 +552,7 @@
// Importing expressions
ExpectedStmt VisitExpr(Expr *E);
ExpectedStmt VisitVAArgExpr(VAArgExpr *E);
+ ExpectedStmt VisitChooseExpr(ChooseExpr *E);
ExpectedStmt VisitGNUNullExpr(GNUNullExpr *E);
ExpectedStmt VisitPredefinedExpr(PredefinedExpr *E);
ExpectedStmt VisitDeclRefExpr(DeclRefExpr *E);
@@ -6135,6 +6136,33 @@
E->isMicrosoftABI());
}
+ExpectedStmt ASTNodeImporter::VisitChooseExpr(ChooseExpr *E) {
+ auto Imp = importSeq(E->getCond(), E->getLHS(), E->getRHS(),
+ E->getBuiltinLoc(), E->getRParenLoc(), E->getType());
+ if (!Imp)
+ return Imp.takeError();
+
+ Expr *ToCond;
+ Expr *ToLHS;
+ Expr *ToRHS;
+ SourceLocation ToBuiltinLoc, ToRParenLoc;
+ QualType ToType;
+ std::tie(ToCond, ToLHS, ToRHS, ToBuiltinLoc, ToRParenLoc, ToType) = *Imp;
+
+ ExprValueKind VK = E->getValueKind();
+ ExprObjectKind OK = E->getObjectKind();
+
+ bool TypeDependent = ToCond->isTypeDependent();
+ bool ValueDependent = ToCond->isValueDependent();
+
+ // The value of CondIsTrue only matters if the value is not
+ // condition-dependent.
+ bool CondIsTrue = !E->isConditionDependent() && E->isConditionTrue();
+
+ return new (Importer.getToContext())
+ ChooseExpr(ToBuiltinLoc, ToCond, ToLHS, ToRHS, ToType, VK, OK,
+ ToRParenLoc, CondIsTrue, TypeDependent, ValueDependent);
+}
ExpectedStmt ASTNodeImporter::VisitGNUNullExpr(GNUNullExpr *E) {
ExpectedType TypeOrErr = import(E->getType());
Index: clang/include/clang/ASTMatchers/ASTMatchers.h
===================================================================
--- clang/include/clang/ASTMatchers/ASTMatchers.h
+++ clang/include/clang/ASTMatchers/ASTMatchers.h
@@ -2158,6 +2158,10 @@
extern const internal::VariadicDynCastAllOfMatcher<Stmt, CXXNullPtrLiteralExpr>
cxxNullPtrLiteralExpr;
+/// Matches GNU __builtin_choose_expr.
+extern const internal::VariadicDynCastAllOfMatcher<Stmt, ChooseExpr>
+ chooseExpr;
+
/// Matches GNU __null expression.
extern const internal::VariadicDynCastAllOfMatcher<Stmt, GNUNullExpr>
gnuNullExpr;
Index: clang/docs/LibASTMatchersReference.html
===================================================================
--- clang/docs/LibASTMatchersReference.html
+++ clang/docs/LibASTMatchersReference.html
@@ -788,6 +788,11 @@
</pre></td></tr>
+<tr><td>Matcher<<a href="https://clang.llvm.org/doxygen/classclang_1_1Stmt.html";>Stmt</a>></td><td class="name" onclick="toggle('chooseExpr0')"><a name="chooseExpr0Anchor">chooseExpr</a></td><td>Matcher<<a href="https://clang.llvm.org/doxygen/classclang_1_1ChooseExpr.html";>ChooseExpr</a>>...</td></tr>
+<tr><td colspan="4" class="doc" id="chooseExpr0"><pre>Matches GNU __builtin_choose_expr.
+</pre></td></tr>
+
+
<tr><td>Matcher<<a href="https://clang.llvm.org/doxygen/classclang_1_1Stmt.html";>Stmt</a>></td><td class="name" onclick="toggle('compoundLiteralExpr0')"><a name="compoundLiteralExpr0Anchor">compoundLiteralExpr</a></td><td>Matcher<<a href="https://clang.llvm.org/doxygen/classclang_1_1CompoundLiteralExpr.html";>CompoundLiteralExpr</a>>...</td></tr>
<tr><td colspan="4" class="doc" id="compoundLiteralExpr0"><pre>Matches compound (i.e. non-scalar) literals
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