8344675908
This is a Clang-only change and depends on the existing "musttail" support already implemented in LLVM. The [[clang::musttail]] attribute goes on a return statement, not a function definition. There are several constraints that the user must follow when using [[clang::musttail]], and these constraints are verified by Sema. Tail calls are supported on regular function calls, calls through a function pointer, member function calls, and even pointer to member. Future work would be to throw a warning if a users tries to pass a pointer or reference to a local variable through a musttail call. Reviewed By: rsmith Differential Revision: https://reviews.llvm.org/D99517
16 lines
770 B
C
16 lines
770 B
C
// RUN: %clang_cc1 -verify -fsyntax-only %s
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int NotAProtoType(); // expected-note{{add 'void' to the parameter list to turn an old-style K&R function declaration into a prototype}}
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int TestCalleeNotProtoType(void) {
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__attribute__((musttail)) return NotAProtoType(); // expected-error{{'musttail' attribute requires that both caller and callee functions have a prototype}}
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}
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int ProtoType(void);
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int TestCallerNotProtoType() { // expected-note{{add 'void' to the parameter list to turn an old-style K&R function declaration into a prototype}}
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__attribute__((musttail)) return ProtoType(); // expected-error{{'musttail' attribute requires that both caller and callee functions have a prototype}}
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}
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int TestProtoType(void) {
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return ProtoType();
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}
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