Author: nikola
Date: Tue Sep 13 02:02:02 2016
New Revision: 281298
URL: http://llvm.org/viewvc/llvm-project?rev=281298&view=rev
Log:
Allow register variables in naked functions.
Modified:
cfe/trunk/lib/Sema/SemaDecl.cpp
cfe/trunk/test/Sema/attr-naked.c
Modified: cfe/trunk/lib/Sema/SemaDecl.cpp
URL:
http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/Sema/SemaDecl.cpp?rev=281298&r1=281297&r2=281298&view=diff
==============================================================================
--- cfe/trunk/lib/Sema/SemaDecl.cpp (original)
+++ cfe/trunk/lib/Sema/SemaDecl.cpp Tue Sep 13 02:02:02 2016
@@ -11818,6 +11818,21 @@ Decl *Sema::ActOnFinishFunctionBody(Decl
if (FD && FD->hasAttr<NakedAttr>()) {
for (const Stmt *S : Body->children()) {
+ // Allow local register variables without initializer as they don't
+ // require prologue.
+ bool RegisterVariables = false;
+ if (auto *DS = dyn_cast<DeclStmt>(S)) {
+ for (const auto *Decl : DS->decls()) {
+ if (const auto *Var = dyn_cast<VarDecl>(Decl)) {
+ RegisterVariables =
+ Var->hasAttr<AsmLabelAttr>() && !Var->hasInit();
+ if (!RegisterVariables)
+ break;
+ }
+ }
+ }
+ if (RegisterVariables)
+ continue;
if (!isa<AsmStmt>(S) && !isa<NullStmt>(S)) {
Diag(S->getLocStart(), diag::err_non_asm_stmt_in_naked_function);
Diag(FD->getAttr<NakedAttr>()->getLocation(), diag::note_attribute);
Modified: cfe/trunk/test/Sema/attr-naked.c
URL:
http://llvm.org/viewvc/llvm-project/cfe/trunk/test/Sema/attr-naked.c?rev=281298&r1=281297&r2=281298&view=diff
==============================================================================
--- cfe/trunk/test/Sema/attr-naked.c (original)
+++ cfe/trunk/test/Sema/attr-naked.c Tue Sep 13 02:02:02 2016
@@ -48,3 +48,21 @@ __attribute__((naked)) void t9(int z) {
"r"(z) // expected-error{{parameter references not allowed in
naked functions}}
);
}
+
+__attribute__((naked)) void t10() { // expected-note{{attribute is here}}
+ int a; // expected-error{{non-ASM statement in naked function is not
supported}}
+}
+
+__attribute__((naked)) void t11() { // expected-note{{attribute is here}}
+ register int a asm("eax") = x; // expected-error{{non-ASM statement in naked
function is not supported}}
+}
+
+__attribute__((naked)) void t12() { // expected-note{{attribute is here}}
+ register int a asm("eax"), b asm("ebx") = x; // expected-error{{non-ASM
statement in naked function is not supported}}
+}
+
+__attribute__((naked)) void t13() {
+ register int a asm("eax");
+ register int b asm("ebx"), c asm("ecx");
+}
+
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