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.

llvm-svn: 156933

1 files changed, 23 insertions, 2 deletions

diff --git a/llvm/tools/llvm-rtdyld/llvm-rtdyld.cpp b/llvm/tools/llvm-rtdyld/llvm-rtdyld.cpp
index 01a7d158078..95de8d8a4d5 100644
--- a/llvm/tools/llvm-rtdyld/llvm-rtdyld.cpp
+++ b/llvm/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.