bruno created this revision.
This fixes PR31863, a regression introduced in r276159.
Consider this snippet:
struct FVector;
struct FVector {};
struct FBox {
FVector Min;
FBox(int);
};
namespace {
FBox InvalidBoundingBox(0);
}
While parsing the DECL_VAR for 'struct FBox', clang recursively read all the
dep decls until it finds the DECL_CXX_RECORD forward declaration for 'struct
FVector'. Then, it resumes all the way up back to DECL_VAR handling in
`ReadDeclRecord`, where it checks if `isConsumerInterestedIn` for the decl.
One of the condition for `isConsumerInterestedIn` to return false is if the
VarDecl is imported from a module `D->getImportedOwningModule()`, because it
will get emitted when we import the relevant module. However, before checking
if it comes from a module, clang checks if `Ctx.DeclMustBeEmitted(D)`, which
triggers the emission of 'struct FBox'. Since one of its fields is still
incomplete, it crashes.
Instead, check if `D->getImportedOwningModule()` is true before calling
`Ctx.DeclMustBeEmitted(D)`.
https://reviews.llvm.org/D29753
Files:
lib/Serialization/ASTReaderDecl.cpp
test/PCH/empty-def-fwd-struct.h
Index: test/PCH/empty-def-fwd-struct.h
===================================================================
--- /dev/null
+++ test/PCH/empty-def-fwd-struct.h
@@ -0,0 +1,12 @@
+// RUN: %clang_cc1 -emit-pch -x c++-header %s -std=c++14 -o %t.pch
+// RUN: %clang_cc1 -emit-llvm -x c++ /dev/null -std=c++14 -include-pch %t.pch
-o %t.o
+struct FVector;
+struct FVector {};
+struct FBox {
+ FVector Min;
+ FBox(int);
+};
+namespace {
+FBox InvalidBoundingBox(0);
+}
+
Index: lib/Serialization/ASTReaderDecl.cpp
===================================================================
--- lib/Serialization/ASTReaderDecl.cpp
+++ lib/Serialization/ASTReaderDecl.cpp
@@ -2517,8 +2517,8 @@
// An ImportDecl or VarDecl imported from a module will get emitted when
// we import the relevant module.
- if ((isa<ImportDecl>(D) || isa<VarDecl>(D)) && Ctx.DeclMustBeEmitted(D) &&
- D->getImportedOwningModule())
+ if ((isa<ImportDecl>(D) || isa<VarDecl>(D)) && D->getImportedOwningModule()
&&
+ Ctx.DeclMustBeEmitted(D))
return false;
if (isa<FileScopeAsmDecl>(D) ||
Index: test/PCH/empty-def-fwd-struct.h
===================================================================
--- /dev/null
+++ test/PCH/empty-def-fwd-struct.h
@@ -0,0 +1,12 @@
+// RUN: %clang_cc1 -emit-pch -x c++-header %s -std=c++14 -o %t.pch
+// RUN: %clang_cc1 -emit-llvm -x c++ /dev/null -std=c++14 -include-pch %t.pch -o %t.o
+struct FVector;
+struct FVector {};
+struct FBox {
+ FVector Min;
+ FBox(int);
+};
+namespace {
+FBox InvalidBoundingBox(0);
+}
+
Index: lib/Serialization/ASTReaderDecl.cpp
===================================================================
--- lib/Serialization/ASTReaderDecl.cpp
+++ lib/Serialization/ASTReaderDecl.cpp
@@ -2517,8 +2517,8 @@
// An ImportDecl or VarDecl imported from a module will get emitted when
// we import the relevant module.
- if ((isa<ImportDecl>(D) || isa<VarDecl>(D)) && Ctx.DeclMustBeEmitted(D) &&
- D->getImportedOwningModule())
+ if ((isa<ImportDecl>(D) || isa<VarDecl>(D)) && D->getImportedOwningModule() &&
+ Ctx.DeclMustBeEmitted(D))
return false;
if (isa<FileScopeAsmDecl>(D) ||
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