https://github.com/alirezamoshtaghi updated https://github.com/llvm/llvm-project/pull/83369
>From 3d6afe011221ac239bb668b375ed3f6c356fc47d Mon Sep 17 00:00:00 2001 From: alirezamoshtaghi <alireza.moshta...@gmail.com> Date: Wed, 28 Feb 2024 13:55:11 -0800 Subject: [PATCH] [CLANGD] Do not crash on designator initialization of union --- .../clangd/test/designator_init.test | 31 +++++++++++++++++++ clang/lib/AST/Expr.cpp | 14 +++++++-- 2 files changed, 43 insertions(+), 2 deletions(-) create mode 100644 clang-tools-extra/clangd/test/designator_init.test diff --git a/clang-tools-extra/clangd/test/designator_init.test b/clang-tools-extra/clangd/test/designator_init.test new file mode 100644 index 00000000000000..739f2bfab54bcf --- /dev/null +++ b/clang-tools-extra/clangd/test/designator_init.test @@ -0,0 +1,31 @@ +//# RUN: rm -rf %t.dir/* && mkdir -p %t.dir +//# RUN: echo '[{"directory": "%/t.dir", "command": "clang -x c -c %s", "file": "%s"}]' > %t.dir/compile_commands.json +//# RUN: clangd --compile-commands-dir=%t.dir --check=%s 2>&1 | FileCheck %s + +typedef struct S { + unsigned char id; + union { + unsigned int mask; + struct { + unsigned int unused:10; + unsigned int reserved:3; + unsigned int rest:19; + }; + }; +} __attribute__((packed)) S_t; + +typedef struct H { + unsigned char hid; + unsigned int val; +} handler_t; + +struct S +get_foo (handler_t *h) +{ + S_t retval = + {.id=h->hid, + .mask=h->val}; + return retval; +} + +// CHECK: All checks completed, 0 errors diff --git a/clang/lib/AST/Expr.cpp b/clang/lib/AST/Expr.cpp index b4de2155adcebd..33eeeda89fe7a5 100644 --- a/clang/lib/AST/Expr.cpp +++ b/clang/lib/AST/Expr.cpp @@ -4601,11 +4601,21 @@ SourceRange DesignatedInitExpr::getDesignatorsSourceRange() const { SourceLocation DesignatedInitExpr::getBeginLoc() const { auto *DIE = const_cast<DesignatedInitExpr *>(this); Designator &First = *DIE->getDesignator(0); - if (First.isFieldDesignator()) - return GNUSyntax ? First.getFieldLoc() : First.getDotLoc(); + if (First.isFieldDesignator()) { + /* search all designators in case the first one is not + initialized */ + for (unsigned int i=0; i<DIE->size(); i++) { + Designator &Des = *DIE->getDesignator(i); + SourceLocation retval = GNUSyntax ? Des.getFieldLoc() : Des.getDotLoc(); + if (!retval.isValid ()) + continue; + return retval; + } + } return First.getLBracketLoc(); } + SourceLocation DesignatedInitExpr::getEndLoc() const { return getInit()->getEndLoc(); } _______________________________________________ cfe-commits mailing list cfe-commits@lists.llvm.org https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits