From 068c65b22d50c265b51886062b2b9c1cb696d67d Mon Sep 17 00:00:00 2001
From: Danil Malyshev <dmalyshev@accesssoftek.com>
Date: Wed, 16 May 2012 18:50:11 +0000
Subject: Added LLIMCJITMemoryManager to the lli. This manager will be used for
 MCJIT instead of DefaultJIMMemoryManager. It's more flexible for MCJIT tasks,
 in addition it's provides a invalidation instruction cache for code sections
 which will be used before JIT code will be executed.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@156933 91177308-0d34-0410-b5e6-96231b3b80d8
---
 tools/llvm-rtdyld/llvm-rtdyld.cpp | 25 +++++++++++++++++++++++--
 1 file changed, 23 insertions(+), 2 deletions(-)

(limited to 'tools/llvm-rtdyld')

diff --git a/tools/llvm-rtdyld/llvm-rtdyld.cpp b/tools/llvm-rtdyld/llvm-rtdyld.cpp
index 01a7d15807..95de8d8a4d 100644
--- a/tools/llvm-rtdyld/llvm-rtdyld.cpp
+++ b/tools/llvm-rtdyld/llvm-rtdyld.cpp
@@ -63,18 +63,37 @@ public:
     return 0;
   }
 
+  // Invalidate instruction cache for sections with execute permissions.
+  // Some platforms with separate data cache and instruction cache require
+  // explicit cache flush, otherwise JIT code manipulations (like resolved
+  // relocations) will get to the data cache but not to the instruction cache.
+  virtual void invalidateInstructionCache();
 };
 
 uint8_t *TrivialMemoryManager::allocateCodeSection(uintptr_t Size,
                                                    unsigned Alignment,
                                                    unsigned SectionID) {
-  return (uint8_t*)sys::Memory::AllocateRWX(Size, 0, 0).base();
+  sys::MemoryBlock MB = sys::Memory::AllocateRWX(Size, 0, 0);
+  FunctionMemory.push_back(MB);
+  return (uint8_t*)MB.base();
 }
 
 uint8_t *TrivialMemoryManager::allocateDataSection(uintptr_t Size,
                                                    unsigned Alignment,
                                                    unsigned SectionID) {
-  return (uint8_t*)sys::Memory::AllocateRWX(Size, 0, 0).base();
+  sys::MemoryBlock MB = sys::Memory::AllocateRWX(Size, 0, 0);
+  DataMemory.push_back(MB);
+  return (uint8_t*)MB.base();
+}
+
+void TrivialMemoryManager::invalidateInstructionCache() {
+  for (int i = 0, e = FunctionMemory.size(); i != e; ++i)
+    sys::Memory::InvalidateInstructionCache(FunctionMemory[i].base(),
+                                            FunctionMemory[i].size());
+
+  for (int i = 0, e = DataMemory.size(); i != e; ++i)
+    sys::Memory::InvalidateInstructionCache(DataMemory[i].base(),
+                                            DataMemory[i].size());
 }
 
 static const char *ProgramName;
@@ -113,6 +132,8 @@ static int executeInput() {
 
   // Resolve all the relocations we can.
   Dyld.resolveRelocations();
+  // Clear instruction cache before code will be executed.
+  MemMgr->invalidateInstructionCache();
 
   // FIXME: Error out if there are unresolved relocations.
 
-- 
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