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[PERF]: Make all trap handlers, trap exit code, fatal exit code, and exception dispatch code "no return" since it always leads to an iret or other kind of non-directly-returning mechanism. This allows the compiler to optimize better and also remove useless code at the bottom of the functions. Since __builtin_unreachable is only for GCC 4.5, we use exit(0) for now (it will never be reached) to trick GCC.
svn path=/trunk/; revision=45223
This commit is contained in:
Sir Richard
parent
f4cdf7ef0f
commit
280c5bef1e
2 changed files with 46 additions and 1 deletions
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@ -214,6 +214,7 @@ KiCheckForApcDelivery(IN PKTRAP_FRAME TrapFrame)
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VOID
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FORCEINLINE
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DECLSPEC_NORETURN
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KiDispatchException0Args(IN NTSTATUS Code,
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IN ULONG_PTR Address,
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IN PKTRAP_FRAME TrapFrame)
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@ -224,6 +225,7 @@ KiDispatchException0Args(IN NTSTATUS Code,
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VOID
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FORCEINLINE
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DECLSPEC_NORETURN
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KiDispatchException1Args(IN NTSTATUS Code,
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IN ULONG_PTR Address,
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IN ULONG P1,
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@ -235,6 +237,7 @@ KiDispatchException1Args(IN NTSTATUS Code,
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VOID
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FORCEINLINE
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DECLSPEC_NORETURN
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KiDispatchException2Args(IN NTSTATUS Code,
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IN ULONG_PTR Address,
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IN ULONG P1,
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@ -247,6 +250,7 @@ KiDispatchException2Args(IN NTSTATUS Code,
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FORCEINLINE
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VOID
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DECLSPEC_NORETURN
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KiSystemCallReturn(IN PKTRAP_FRAME TrapFrame)
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{
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/* Restore nonvolatiles, EAX, and do a "jump" back to the kernel caller */
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@ -272,10 +276,12 @@ KiSystemCallReturn(IN PKTRAP_FRAME TrapFrame)
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[v] "i"(KTRAP_FRAME_ESP)
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: "%esp"
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);
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exit(0);
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}
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FORCEINLINE
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VOID
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DECLSPEC_NORETURN
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KiSystemCallTrapReturn(IN PKTRAP_FRAME TrapFrame)
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{
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/* Regular interrupt exit, but we only restore EAX as a volatile */
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@ -299,10 +305,12 @@ KiSystemCallTrapReturn(IN PKTRAP_FRAME TrapFrame)
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[e] "i"(KTRAP_FRAME_EIP)
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: "%esp"
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);
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exit(0);
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}
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FORCEINLINE
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VOID
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DECLSPEC_NORETURN
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KiSystemCallSysExitReturn(IN PKTRAP_FRAME TrapFrame)
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{
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/* Restore nonvolatiles, EAX, and do a SYSEXIT back to the user caller */
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@ -330,10 +338,12 @@ KiSystemCallSysExitReturn(IN PKTRAP_FRAME TrapFrame)
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[v] "i"(KTRAP_FRAME_V86_ES)
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: "%esp"
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);
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exit(0);
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}
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FORCEINLINE
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VOID
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DECLSPEC_NORETURN
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KiTrapReturn(IN PKTRAP_FRAME TrapFrame)
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{
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/* Regular interrupt exit */
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@ -361,10 +371,12 @@ KiTrapReturn(IN PKTRAP_FRAME TrapFrame)
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[e] "i"(KTRAP_FRAME_EIP)
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: "%esp"
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);
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exit(0);
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}
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FORCEINLINE
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VOID
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DECLSPEC_NORETURN
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KiEditedTrapReturn(IN PKTRAP_FRAME TrapFrame)
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{
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/* Regular interrupt exit */
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@ -393,6 +405,7 @@ KiEditedTrapReturn(IN PKTRAP_FRAME TrapFrame)
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[e] "i"(KTRAP_FRAME_ERROR_CODE) /* We *WANT* the error code since ESP is there! */
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: "%esp"
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);
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exit(0);
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}
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NTSTATUS
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@ -50,6 +50,7 @@ UCHAR KiTrapIoTable[] =
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VOID
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FASTCALL
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DECLSPEC_NORETURN
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KiExitTrap(IN PKTRAP_FRAME TrapFrame,
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IN UCHAR Skip)
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{
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@ -235,6 +236,7 @@ KiExitV86Trap(IN PKTRAP_FRAME TrapFrame)
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VOID
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FASTCALL
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DECLSPEC_NORETURN
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KiEoiHelper(IN PKTRAP_FRAME TrapFrame)
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{
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/* Disable interrupts until we return */
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@ -249,6 +251,7 @@ KiEoiHelper(IN PKTRAP_FRAME TrapFrame)
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VOID
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FASTCALL
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DECLSPEC_NORETURN
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KiServiceExit(IN PKTRAP_FRAME TrapFrame,
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IN NTSTATUS Status)
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{
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@ -267,6 +270,7 @@ KiServiceExit(IN PKTRAP_FRAME TrapFrame,
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VOID
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FASTCALL
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DECLSPEC_NORETURN
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KiServiceExit2(IN PKTRAP_FRAME TrapFrame)
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{
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/* Disable interrupts until we return */
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@ -423,6 +427,7 @@ KiEnterTrap(IN PKTRAP_FRAME TrapFrame)
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VOID
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FASTCALL
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DECLSPEC_NORETURN
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KiSystemFatalException(IN ULONG ExceptionCode,
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IN PKTRAP_FRAME TrapFrame)
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{
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@ -437,6 +442,7 @@ KiSystemFatalException(IN ULONG ExceptionCode,
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VOID
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NTAPI
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DECLSPEC_NORETURN
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KiDispatchExceptionFromTrapFrame(IN NTSTATUS Code,
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IN ULONG_PTR Address,
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IN ULONG ParameterCount,
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@ -477,6 +483,7 @@ KiDispatchExceptionFromTrapFrame(IN NTSTATUS Code,
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VOID
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FASTCALL
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DECLSPEC_NORETURN
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KiDebugHandler(IN PKTRAP_FRAME TrapFrame,
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IN ULONG Parameter1,
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IN ULONG Parameter2,
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@ -500,6 +507,7 @@ KiDebugHandler(IN PKTRAP_FRAME TrapFrame,
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VOID
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FASTCALL
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DECLSPEC_NORETURN
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KiNpxHandler(IN PKTRAP_FRAME TrapFrame,
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IN PKTHREAD Thread,
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IN PFX_SAVE_AREA SaveArea)
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@ -656,6 +664,7 @@ KiNpxHandler(IN PKTRAP_FRAME TrapFrame,
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VOID
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FASTCALL
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DECLSPEC_NORETURN
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KiTrap00Handler(IN PKTRAP_FRAME TrapFrame)
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{
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/* Save trap frame */
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@ -675,6 +684,7 @@ KiTrap00Handler(IN PKTRAP_FRAME TrapFrame)
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VOID
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FASTCALL
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DECLSPEC_NORETURN
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KiTrap01Handler(IN PKTRAP_FRAME TrapFrame)
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{
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/* Save trap frame */
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@ -694,6 +704,7 @@ KiTrap01Handler(IN PKTRAP_FRAME TrapFrame)
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}
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VOID
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DECLSPEC_NORETURN
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KiTrap02(VOID)
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{
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PKTSS Tss, NmiTss;
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@ -840,6 +851,7 @@ KiTrap02(VOID)
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VOID
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FASTCALL
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DECLSPEC_NORETURN
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KiTrap03Handler(IN PKTRAP_FRAME TrapFrame)
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{
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/* Save trap frame */
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@ -851,6 +863,7 @@ KiTrap03Handler(IN PKTRAP_FRAME TrapFrame)
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VOID
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FASTCALL
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DECLSPEC_NORETURN
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KiTrap04Handler(IN PKTRAP_FRAME TrapFrame)
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{
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/* Save trap frame */
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@ -870,6 +883,7 @@ KiTrap04Handler(IN PKTRAP_FRAME TrapFrame)
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VOID
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FASTCALL
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DECLSPEC_NORETURN
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KiTrap05Handler(IN PKTRAP_FRAME TrapFrame)
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{
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/* Save trap frame */
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@ -892,6 +906,7 @@ KiTrap05Handler(IN PKTRAP_FRAME TrapFrame)
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VOID
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FASTCALL
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DECLSPEC_NORETURN
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KiTrap06Handler(IN PKTRAP_FRAME TrapFrame)
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{
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PUCHAR Instruction;
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@ -937,6 +952,7 @@ KiTrap06Handler(IN PKTRAP_FRAME TrapFrame)
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VOID
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FASTCALL
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DECLSPEC_NORETURN
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KiTrap07Handler(IN PKTRAP_FRAME TrapFrame)
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{
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PKTHREAD Thread, NpxThread;
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@ -1046,6 +1062,7 @@ KiTrap07Handler(IN PKTRAP_FRAME TrapFrame)
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VOID
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FASTCALL
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DECLSPEC_NORETURN
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KiTrap08Handler(IN PKTRAP_FRAME TrapFrame)
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{
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/* FIXME: Not handled */
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@ -1054,6 +1071,7 @@ KiTrap08Handler(IN PKTRAP_FRAME TrapFrame)
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VOID
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FASTCALL
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DECLSPEC_NORETURN
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KiTrap09Handler(IN PKTRAP_FRAME TrapFrame)
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{
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/* Save trap frame */
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@ -1066,6 +1084,7 @@ KiTrap09Handler(IN PKTRAP_FRAME TrapFrame)
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VOID
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FASTCALL
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DECLSPEC_NORETURN
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KiTrap0AHandler(IN PKTRAP_FRAME TrapFrame)
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{
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/* Save trap frame */
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@ -1080,6 +1099,7 @@ KiTrap0AHandler(IN PKTRAP_FRAME TrapFrame)
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VOID
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FASTCALL
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DECLSPEC_NORETURN
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KiTrap0BHandler(IN PKTRAP_FRAME TrapFrame)
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{
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/* Save trap frame */
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@ -1092,6 +1112,7 @@ KiTrap0BHandler(IN PKTRAP_FRAME TrapFrame)
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VOID
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FASTCALL
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DECLSPEC_NORETURN
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KiTrap0CHandler(IN PKTRAP_FRAME TrapFrame)
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{
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/* Save trap frame */
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@ -1104,6 +1125,7 @@ KiTrap0CHandler(IN PKTRAP_FRAME TrapFrame)
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VOID
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FASTCALL
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DECLSPEC_NORETURN
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KiTrap0DHandler(IN PKTRAP_FRAME TrapFrame,
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IN ULONG EFlags)
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{
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@ -1388,6 +1410,7 @@ KiTrap0DHandler(IN PKTRAP_FRAME TrapFrame,
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VOID
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FASTCALL
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DECLSPEC_NORETURN
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KiTrap0EHandler(IN PKTRAP_FRAME TrapFrame)
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{
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PKTHREAD Thread;
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@ -1510,6 +1533,7 @@ KiTrap0EHandler(IN PKTRAP_FRAME TrapFrame)
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VOID
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FASTCALL
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DECLSPEC_NORETURN
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KiTrap0FHandler(IN PKTRAP_FRAME TrapFrame)
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{
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/* Save trap frame */
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@ -1520,9 +1544,9 @@ KiTrap0FHandler(IN PKTRAP_FRAME TrapFrame)
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KiSystemFatalException(EXCEPTION_RESERVED_TRAP, TrapFrame);
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}
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VOID
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FASTCALL
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DECLSPEC_NORETURN
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KiTrap10Handler(IN PKTRAP_FRAME TrapFrame)
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{
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PKTHREAD Thread;
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@ -1550,6 +1574,7 @@ KiTrap10Handler(IN PKTRAP_FRAME TrapFrame)
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VOID
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FASTCALL
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DECLSPEC_NORETURN
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KiTrap11Handler(IN PKTRAP_FRAME TrapFrame)
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{
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/* Save trap frame */
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@ -1562,6 +1587,7 @@ KiTrap11Handler(IN PKTRAP_FRAME TrapFrame)
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VOID
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FASTCALL
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DECLSPEC_NORETURN
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KiTrap13Handler(IN PKTRAP_FRAME TrapFrame)
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{
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PKTHREAD Thread;
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@ -1664,6 +1690,7 @@ KiCallbackReturnHandler(IN PKTRAP_FRAME TrapFrame)
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VOID
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FASTCALL
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DECLSPEC_NORETURN
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KiRaiseAssertionHandler(IN PKTRAP_FRAME TrapFrame)
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{
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/* Save trap frame */
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@ -1680,6 +1707,7 @@ KiRaiseAssertionHandler(IN PKTRAP_FRAME TrapFrame)
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VOID
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FASTCALL
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DECLSPEC_NORETURN
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KiDebugServiceHandler(IN PKTRAP_FRAME TrapFrame)
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{
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/* Save trap frame */
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@ -1694,6 +1722,7 @@ KiDebugServiceHandler(IN PKTRAP_FRAME TrapFrame)
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VOID
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FASTCALL
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DECLSPEC_NORETURN
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KiSystemCall(IN ULONG SystemCallNumber,
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IN PVOID Arguments)
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{
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@ -1784,6 +1813,7 @@ ExitCall:
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VOID
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FORCEINLINE
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DECLSPEC_NORETURN
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KiSystemCallHandler(IN PKTRAP_FRAME TrapFrame,
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IN ULONG ServiceNumber,
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IN PVOID Arguments,
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@ -1825,6 +1855,7 @@ KiSystemCallHandler(IN PKTRAP_FRAME TrapFrame,
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VOID
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__attribute__((regparm(3)))
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DECLSPEC_NORETURN
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KiFastCallEntryHandler(IN ULONG ServiceNumber,
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IN PVOID Arguments,
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IN PKTRAP_FRAME TrapFrame)
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@ -1858,6 +1889,7 @@ KiFastCallEntryHandler(IN ULONG ServiceNumber,
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VOID
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__attribute__((regparm(3)))
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DECLSPEC_NORETURN
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KiSystemServiceHandler(IN ULONG ServiceNumber,
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IN PVOID Arguments,
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IN PKTRAP_FRAME TrapFrame)
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