yonghong-song updated this revision to Diff 220772.
yonghong-song edited the summary of this revision.
yonghong-song added a comment.
does not change arg type and make result type the same as arg type
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D67734/new/
https://reviews.llvm.org/D67734
Files:
clang/docs/LanguageExtensions.rst
clang/include/clang/Basic/Builtins.def
clang/include/clang/Basic/DiagnosticSemaKinds.td
clang/lib/Sema/SemaChecking.cpp
clang/test/Sema/builtin-preserve-access-index.c
Index: clang/test/Sema/builtin-preserve-access-index.c
===================================================================
--- clang/test/Sema/builtin-preserve-access-index.c
+++ clang/test/Sema/builtin-preserve-access-index.c
@@ -4,10 +4,28 @@
return __builtin_preserve_access_index(&arg[1], 1); // expected-error {{too many arguments to function call, expected 1, have 2}}
}
-void *invalid2(const int *arg) {
- return __builtin_preserve_access_index(&arg[1]); // expected-warning {{returning 'const void *' from a function with result type 'void *' discards qualifiers}}
+const void *invalid2(const int *arg) {
+ return __builtin_preserve_access_index(1); // expected-error {{__builtin_preserve_access_index argument must a pointer type instead of 'int'}}
}
-const void *invalid3(const int *arg) {
- return __builtin_preserve_access_index(1); // expected-warning {{incompatible integer to pointer conversion passing 'int' to parameter of type 'const void *'}}
+void *invalid3(const int *arg) {
+ return __builtin_preserve_access_index(&arg[1]); // expected-warning {{returning 'const int *' from a function with result type 'void *' discards qualifiers}}
+}
+
+const void *invalid4(volatile const int *arg) {
+ return __builtin_preserve_access_index(arg); // expected-warning {{returning 'const volatile int *' from a function with result type 'const void *' discards qualifiers}}
+}
+
+int *valid5(int *arg) {
+ return __builtin_preserve_access_index(arg);
+}
+
+int valid6(const volatile int *arg) {
+ return *__builtin_preserve_access_index(arg);
+}
+
+struct s { int a; int b; };
+
+int valid7(struct s *arg) {
+ return *__builtin_preserve_access_index(&arg->b);
}
Index: clang/lib/Sema/SemaChecking.cpp
===================================================================
--- clang/lib/Sema/SemaChecking.cpp
+++ clang/lib/Sema/SemaChecking.cpp
@@ -191,12 +191,22 @@
return false;
}
-/// Check the number of arguments, and set the result type to
+/// Check the number of arguments and arg type, and set the result type to
/// the argument type.
static bool SemaBuiltinPreserveAI(Sema &S, CallExpr *TheCall) {
if (checkArgCount(S, TheCall, 1))
return true;
+ // The argument type must be a pointer
+ ExprResult Arg = TheCall->getArg(0);
+ QualType Ty = Arg.get()->getType();
+ if (!Ty->isPointerType()) {
+ S.Diag(Arg.get()->getBeginLoc(),
+ diag::err_builtin_preserve_access_index_invalid_arg)
+ << Ty << Arg.get()->getSourceRange();
+ return true;
+ }
+
TheCall->setType(TheCall->getArg(0)->getType());
return false;
}
Index: clang/include/clang/Basic/DiagnosticSemaKinds.td
===================================================================
--- clang/include/clang/Basic/DiagnosticSemaKinds.td
+++ clang/include/clang/Basic/DiagnosticSemaKinds.td
@@ -9922,4 +9922,7 @@
"__builtin_bit_cast %select{source|destination}0 type must be trivially copyable">;
def err_bit_cast_type_size_mismatch : Error<
"__builtin_bit_cast source size does not equal destination size (%0 vs %1)">;
+
+def err_builtin_preserve_access_index_invalid_arg : Error<
+ "__builtin_preserve_access_index argument must a pointer type instead of %0">;
} // end of sema component.
Index: clang/include/clang/Basic/Builtins.def
===================================================================
--- clang/include/clang/Basic/Builtins.def
+++ clang/include/clang/Basic/Builtins.def
@@ -1470,7 +1470,7 @@
BUILTIN(__builtin_operator_delete, "vv*", "tn")
BUILTIN(__builtin_char_memchr, "c*cC*iz", "n")
BUILTIN(__builtin_dump_struct, "ivC*v*", "tn")
-BUILTIN(__builtin_preserve_access_index, "vC*vC*", "nU")
+BUILTIN(__builtin_preserve_access_index, "v.", "t")
// Safestack builtins
BUILTIN(__builtin___get_unsafe_stack_start, "v*", "Fn")
Index: clang/docs/LanguageExtensions.rst
===================================================================
--- clang/docs/LanguageExtensions.rst
+++ clang/docs/LanguageExtensions.rst
@@ -2353,12 +2353,14 @@
array subscript access and structure/union member access are relocatable
under bpf compile-once run-everywhere framework. Debuginfo (typically
with ``-g``) is needed, otherwise, the compiler will exit with an error.
+The return type for the intrinsic is the same as the type of the
+argument, and must be a pointer type.
**Syntax**:
.. code-block:: c
- const void * __builtin_preserve_access_index(const void * ptr)
+ PointerT __builtin_preserve_access_index(PointerT ptr)
**Example of Use**:
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