Adding MCJIT and MemoryBuffer unit tests
Patch by Daniel Malea.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@165246 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/unittests/ExecutionEngine/MCJIT/SectionMemoryManager.cpp b/unittests/ExecutionEngine/MCJIT/SectionMemoryManager.cpp
new file mode 100644
index 0000000..7f3cf24
--- /dev/null
+++ b/unittests/ExecutionEngine/MCJIT/SectionMemoryManager.cpp
@@ -0,0 +1,135 @@
+//===-- SectionMemoryManager.cpp - The memory manager for MCJIT -----------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file defines the implementation of the section-based memory manager
+// used by MCJIT.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Config/config.h"
+#include "llvm/Support/DynamicLibrary.h"
+
+#include "SectionMemoryManager.h"
+
+#ifdef __linux__
+// These includes used by SectionMemoryManager::getPointerToNamedFunction()
+// for Glibc trickery. Look comments in this function for more information.
+#ifdef HAVE_SYS_STAT_H
+#include <sys/stat.h>
+#endif
+#include <fcntl.h>
+#include <unistd.h>
+#endif
+
+namespace llvm {
+
+uint8_t *SectionMemoryManager::allocateDataSection(uintptr_t Size,
+ unsigned Alignment,
+ unsigned SectionID) {
+ if (!Alignment)
+ Alignment = 16;
+ uint8_t *Addr = (uint8_t*)calloc((Size + Alignment - 1)/Alignment, Alignment);
+ AllocatedDataMem.push_back(sys::MemoryBlock(Addr, Size));
+ return Addr;
+}
+
+uint8_t *SectionMemoryManager::allocateCodeSection(uintptr_t Size,
+ unsigned Alignment,
+ unsigned SectionID) {
+ if (!Alignment)
+ Alignment = 16;
+ unsigned NeedAllocate = Alignment * ((Size + Alignment - 1)/Alignment + 1);
+ uintptr_t Addr = 0;
+ // Look in the list of free code memory regions and use a block there if one
+ // is available.
+ for (int i = 0, e = FreeCodeMem.size(); i != e; ++i) {
+ sys::MemoryBlock &MB = FreeCodeMem[i];
+ if (MB.size() >= NeedAllocate) {
+ Addr = (uintptr_t)MB.base();
+ uintptr_t EndOfBlock = Addr + MB.size();
+ // Align the address.
+ Addr = (Addr + Alignment - 1) & ~(uintptr_t)(Alignment - 1);
+ // Store cutted free memory block.
+ FreeCodeMem[i] = sys::MemoryBlock((void*)(Addr + Size),
+ EndOfBlock - Addr - Size);
+ return (uint8_t*)Addr;
+ }
+ }
+
+ // No pre-allocated free block was large enough. Allocate a new memory region.
+ sys::MemoryBlock MB = sys::Memory::AllocateRWX(NeedAllocate, 0, 0);
+
+ AllocatedCodeMem.push_back(MB);
+ Addr = (uintptr_t)MB.base();
+ uintptr_t EndOfBlock = Addr + MB.size();
+ // Align the address.
+ Addr = (Addr + Alignment - 1) & ~(uintptr_t)(Alignment - 1);
+ // The AllocateRWX may allocate much more memory than we need. In this case,
+ // we store the unused memory as a free memory block.
+ unsigned FreeSize = EndOfBlock-Addr-Size;
+ if (FreeSize > 16)
+ FreeCodeMem.push_back(sys::MemoryBlock((void*)(Addr + Size), FreeSize));
+
+ // Return aligned address
+ return (uint8_t*)Addr;
+}
+
+void SectionMemoryManager::invalidateInstructionCache() {
+ for (int i = 0, e = AllocatedCodeMem.size(); i != e; ++i)
+ sys::Memory::InvalidateInstructionCache(AllocatedCodeMem[i].base(),
+ AllocatedCodeMem[i].size());
+}
+
+void *SectionMemoryManager::getPointerToNamedFunction(const std::string &Name,
+ bool AbortOnFailure) {
+#if defined(__linux__)
+ //===--------------------------------------------------------------------===//
+ // Function stubs that are invoked instead of certain library calls
+ //
+ // Force the following functions to be linked in to anything that uses the
+ // JIT. This is a hack designed to work around the all-too-clever Glibc
+ // strategy of making these functions work differently when inlined vs. when
+ // not inlined, and hiding their real definitions in a separate archive file
+ // that the dynamic linker can't see. For more info, search for
+ // 'libc_nonshared.a' on Google, or read http://llvm.org/PR274.
+ if (Name == "stat") return (void*)(intptr_t)&stat;
+ if (Name == "fstat") return (void*)(intptr_t)&fstat;
+ if (Name == "lstat") return (void*)(intptr_t)&lstat;
+ if (Name == "stat64") return (void*)(intptr_t)&stat64;
+ if (Name == "fstat64") return (void*)(intptr_t)&fstat64;
+ if (Name == "lstat64") return (void*)(intptr_t)&lstat64;
+ if (Name == "atexit") return (void*)(intptr_t)&atexit;
+ if (Name == "mknod") return (void*)(intptr_t)&mknod;
+#endif // __linux__
+
+ const char *NameStr = Name.c_str();
+ void *Ptr = sys::DynamicLibrary::SearchForAddressOfSymbol(NameStr);
+ if (Ptr) return Ptr;
+
+ // If it wasn't found and if it starts with an underscore ('_') character,
+ // try again without the underscore.
+ if (NameStr[0] == '_') {
+ Ptr = sys::DynamicLibrary::SearchForAddressOfSymbol(NameStr+1);
+ if (Ptr) return Ptr;
+ }
+
+ if (AbortOnFailure)
+ report_fatal_error("Program used external function '" + Name +
+ "' which could not be resolved!");
+ return 0;
+}
+
+SectionMemoryManager::~SectionMemoryManager() {
+ for (unsigned i = 0, e = AllocatedCodeMem.size(); i != e; ++i)
+ sys::Memory::ReleaseRWX(AllocatedCodeMem[i]);
+ for (unsigned i = 0, e = AllocatedDataMem.size(); i != e; ++i)
+ free(AllocatedDataMem[i].base());
+}
+
+} // namespace llvm