mibintc created this revision.
mibintc added a reviewer: aaron.ballman.
Herald added a subscriber: pengfei.
mibintc requested review of this revision.
Herald added a project: clang.
I got a bug report that https://reviews.llvm.org/D97764 which introduced this
diagnostic, was causing problems in interrupt service routines, complaining
about functions like abort, exit, or the x86intrin routines (that are really
just inlined asm). I think modifying the diagnostic level from error to warn is
the safest way to deal with the problem. Checking "always inline" attribute on
the called function isn't itself enough without knowing that the called
function is leaf. (Separately, perhaps x86intrin functions should be decorated
with attribute 'no_caller_saved_registers' in their declarations.)
Repository:
rG LLVM Github Monorepo
https://reviews.llvm.org/D100511
Files:
clang/include/clang/Basic/DiagnosticSemaKinds.td
clang/lib/Sema/SemaExpr.cpp
clang/test/Sema/attr-x86-interrupt.c
Index: clang/test/Sema/attr-x86-interrupt.c
===================================================================
--- clang/test/Sema/attr-x86-interrupt.c
+++ clang/test/Sema/attr-x86-interrupt.c
@@ -51,7 +51,7 @@
__attribute__((no_caller_saved_registers))
#else
// expected-note@+3 {{'foo9' declared here}}
-// expected-error@+4 {{interrupt service routine may only call a function with
attribute 'no_caller_saved_registers'}}
+// expected-warning@+4 {{interrupt service routine should only call a function
with attribute 'no_caller_saved_registers'}}
#endif
void foo9(int *a, Arg2Type b) {}
__attribute__((interrupt)) void fooA(int *a, Arg2Type b) {
Index: clang/lib/Sema/SemaExpr.cpp
===================================================================
--- clang/lib/Sema/SemaExpr.cpp
+++ clang/lib/Sema/SemaExpr.cpp
@@ -6607,7 +6607,7 @@
}
if (Caller->hasAttr<AnyX86InterruptAttr>() &&
((!FDecl || !FDecl->hasAttr<AnyX86NoCallerSavedRegistersAttr>()))) {
- Diag(Fn->getExprLoc(), diag::err_anyx86_interrupt_regsave);
+ Diag(Fn->getExprLoc(), diag::warn_anyx86_interrupt_regsave);
if (FDecl)
Diag(FDecl->getLocation(), diag::note_callee_decl) << FDecl;
}
Index: clang/include/clang/Basic/DiagnosticSemaKinds.td
===================================================================
--- clang/include/clang/Basic/DiagnosticSemaKinds.td
+++ clang/include/clang/Basic/DiagnosticSemaKinds.td
@@ -293,9 +293,10 @@
"a pointer as the first parameter|a %2 type as the second parameter}1">;
def err_anyx86_interrupt_called : Error<
"interrupt service routine cannot be called directly">;
-def err_anyx86_interrupt_regsave : Error<
- "interrupt service routine may only call a function"
- " with attribute 'no_caller_saved_registers'">;
+def warn_anyx86_interrupt_regsave : Warning<
+ "interrupt service routine should only call a function"
+ " with attribute 'no_caller_saved_registers'">,
+ InGroup<Extra>;
def warn_arm_interrupt_calling_convention : Warning<
"call to function without interrupt attribute could clobber interruptee's
VFP registers">,
InGroup<Extra>;
Index: clang/test/Sema/attr-x86-interrupt.c
===================================================================
--- clang/test/Sema/attr-x86-interrupt.c
+++ clang/test/Sema/attr-x86-interrupt.c
@@ -51,7 +51,7 @@
__attribute__((no_caller_saved_registers))
#else
// expected-note@+3 {{'foo9' declared here}}
-// expected-error@+4 {{interrupt service routine may only call a function with attribute 'no_caller_saved_registers'}}
+// expected-warning@+4 {{interrupt service routine should only call a function with attribute 'no_caller_saved_registers'}}
#endif
void foo9(int *a, Arg2Type b) {}
__attribute__((interrupt)) void fooA(int *a, Arg2Type b) {
Index: clang/lib/Sema/SemaExpr.cpp
===================================================================
--- clang/lib/Sema/SemaExpr.cpp
+++ clang/lib/Sema/SemaExpr.cpp
@@ -6607,7 +6607,7 @@
}
if (Caller->hasAttr<AnyX86InterruptAttr>() &&
((!FDecl || !FDecl->hasAttr<AnyX86NoCallerSavedRegistersAttr>()))) {
- Diag(Fn->getExprLoc(), diag::err_anyx86_interrupt_regsave);
+ Diag(Fn->getExprLoc(), diag::warn_anyx86_interrupt_regsave);
if (FDecl)
Diag(FDecl->getLocation(), diag::note_callee_decl) << FDecl;
}
Index: clang/include/clang/Basic/DiagnosticSemaKinds.td
===================================================================
--- clang/include/clang/Basic/DiagnosticSemaKinds.td
+++ clang/include/clang/Basic/DiagnosticSemaKinds.td
@@ -293,9 +293,10 @@
"a pointer as the first parameter|a %2 type as the second parameter}1">;
def err_anyx86_interrupt_called : Error<
"interrupt service routine cannot be called directly">;
-def err_anyx86_interrupt_regsave : Error<
- "interrupt service routine may only call a function"
- " with attribute 'no_caller_saved_registers'">;
+def warn_anyx86_interrupt_regsave : Warning<
+ "interrupt service routine should only call a function"
+ " with attribute 'no_caller_saved_registers'">,
+ InGroup<Extra>;
def warn_arm_interrupt_calling_convention : Warning<
"call to function without interrupt attribute could clobber interruptee's VFP registers">,
InGroup<Extra>;
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