[llvm] r334068 - [Support] Use zx_cache_flush on Fuchsia to flush instruction cache

[Petr Hosek via llvm-commits]

Author: phosek
Date: Tue Jun  5 23:26:18 2018
New Revision: 334068

URL: http://llvm.org/viewvc/llvm-project?rev=334068&view=rev
Log:
[Support] Use zx_cache_flush on Fuchsia to flush instruction cache

Fuchsia doesn't use __clear_cache, instead it provide zx_cache_flush
system call. Use it to flush instruction cache.

Differential Revision: https://reviews.llvm.org/D47753

Modified:
    llvm/trunk/lib/Support/Unix/Memory.inc

Modified: llvm/trunk/lib/Support/Unix/Memory.inc
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Support/Unix/Memory.inc?rev=334068&r1=334067&r2=334068&view=diff
==============================================================================
--- llvm/trunk/lib/Support/Unix/Memory.inc (original)
+++ llvm/trunk/lib/Support/Unix/Memory.inc Tue Jun  5 23:26:18 2018
@@ -25,6 +25,10 @@
 #include <mach/mach.h>
 #endif
 
+#ifdef __Fuchsia__
+#include <zircon/syscalls.h>
+#endif
+
 #if defined(__mips__)
 #  if defined(__OpenBSD__)
 #    include <mips64/sysarch.h>
@@ -33,7 +37,7 @@
 #  endif
 #endif
 
-#ifdef __APPLE__
+#if defined(__APPLE__)
 extern "C" void sys_icache_invalidate(const void *Addr, size_t len);
 #else
 extern "C" void __clear_cache(void *, void*);
@@ -206,6 +210,11 @@ void Memory::InvalidateInstructionCache(
   sys_icache_invalidate(const_cast<void *>(Addr), Len);
 #  endif
 
+#elif defined(__Fuchsia__)
+
+  zx_status_t Status = zx_cache_flush(Addr, Len, ZX_CACHE_FLUSH_INSN);
+  assert(Status == ZX_OK && "cannot invalidate instruction cache");
+
 #else
 
 #  if (defined(__POWERPC__) || defined (__ppc__) || \