The -fms-extensions option affects a number of subtle front-end C/C++
behaviors, and it would be useful to be able to distinguish MS keywords
from regular identifiers in the ms-extensions mode even if the triple
does not define a Windows target. It should make life easier if anyone
needs to port their Windows codes to elsewhere.
Differential Revision: http://reviews.llvm.org/D3034
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@206069
91177308-0d34-0410-b5e6-
96231b3b80d8
IdentifierInfo *Ident__has_include; // __has_include
IdentifierInfo *Ident__has_include_next; // __has_include_next
IdentifierInfo *Ident__has_warning; // __has_warning
+ IdentifierInfo *Ident__is_identifier; // __is_identifier
IdentifierInfo *Ident__building_module; // __building_module
IdentifierInfo *Ident__MODULE__; // __MODULE__
Ident__has_include = RegisterBuiltinMacro(*this, "__has_include");
Ident__has_include_next = RegisterBuiltinMacro(*this, "__has_include_next");
Ident__has_warning = RegisterBuiltinMacro(*this, "__has_warning");
+ Ident__is_identifier = RegisterBuiltinMacro(*this, "__is_identifier");
// Modules.
if (LangOpts.Modules) {
} else if (II == Ident__has_feature ||
II == Ident__has_extension ||
II == Ident__has_builtin ||
+ II == Ident__is_identifier ||
II == Ident__has_attribute) {
// The argument to these builtins should be a parenthesized identifier.
SourceLocation StartLoc = Tok.getLocation();
bool Value = false;
if (!IsValid)
Diag(StartLoc, diag::err_feature_check_malformed);
+ else if (II == Ident__is_identifier)
+ Value = FeatureII->getTokenID() == tok::identifier;
else if (II == Ident__has_builtin) {
// Check for a builtin is trivial.
Value = FeatureII->getBuiltinID() != 0;
--- /dev/null
+// RUN: %clang_cc1 -std=c99 -E %s -o - | FileCheck --check-prefix=CHECK-NONE %s
+
+// RUN: %clang_cc1 -std=gnu89 -E %s -o - \
+// RUN: | FileCheck --check-prefix=CHECK-GNU-KEYWORDS %s
+// RUN: %clang_cc1 -std=c99 -fgnu-keywords -E %s -o - \
+// RUN: | FileCheck --check-prefix=CHECK-GNU-KEYWORDS %s
+// RUN: %clang_cc1 -std=gnu89 -fno-gnu-keywords -E %s -o - \
+// RUN: | FileCheck --check-prefix=CHECK-NONE %s
+
+// RUN: %clang_cc1 -std=c99 -fms-extensions -E %s -o - \
+// RUN: | FileCheck --check-prefix=CHECK-MS-KEYWORDS %s
+
+void f() {
+// CHECK-NONE: int asm
+// CHECK-GNU-KEYWORDS: asm ("ret" : :)
+#if __is_identifier(asm)
+ int asm;
+#else
+ asm ("ret" : :);
+#endif
+}
+
+// CHECK-NONE: no_ms_wchar
+// CHECK-MS-KEYWORDS: has_ms_wchar
+#if __is_identifier(__wchar_t)
+void no_ms_wchar();
+#else
+void has_ms_wchar();
+#endif