[JIT] TrivialMemoryManager: Fail if we can't allocate memory.

TrivialMemoryManager currently doesn't check the return type of AllocateRWX --
and returns a 'null' MemoryBlock to its caller. As pointed out by Lang,
this exposes some serious issues with the MemoryManager interface. There's,
in fact, no way to report back an error to clients rather than aborting in
case memory can't be allocated. Eventually the interface will grow to support
this, but for now, fail sooner rather than later.

Differential Revision:	http://reviews.llvm.org/D13627

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@250350 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/tools/llvm-rtdyld/llvm-rtdyld.cpp b/tools/llvm-rtdyld/llvm-rtdyld.cpp
index 1bcd8900a27725497c6d439599355199a55ffa16..0d68918d5be6005c37733580a0d440b68ddaead9 100644 (file)
--- a/tools/llvm-rtdyld/llvm-rtdyld.cpp
+++ b/tools/llvm-rtdyld/llvm-rtdyld.cpp
@@ -181,7 +181,10 @@ uint8_t *TrivialMemoryManager::allocateCodeSection(uintptr_t Size,
                                                    unsigned Alignment,
                                                    unsigned SectionID,
                                                    StringRef SectionName) {
-  sys::MemoryBlock MB = sys::Memory::AllocateRWX(Size, nullptr, nullptr);
+  std::string Err;
+  sys::MemoryBlock MB = sys::Memory::AllocateRWX(Size, nullptr, &Err);
+  if (!MB.base())
+    report_fatal_error("MemoryManager allocation failed: " + Err);
   FunctionMemory.push_back(MB);
   return (uint8_t*)MB.base();
 }
@@ -191,7 +194,10 @@ uint8_t *TrivialMemoryManager::allocateDataSection(uintptr_t Size,
                                                    unsigned SectionID,
                                                    StringRef SectionName,
                                                    bool IsReadOnly) {
-  sys::MemoryBlock MB = sys::Memory::AllocateRWX(Size, nullptr, nullptr);
+  std::string Err;
+  sys::MemoryBlock MB = sys::Memory::AllocateRWX(Size, nullptr, &Err);
+  if (!MB.base())
+    report_fatal_error("MemoryManager allocation failed: " + Err);
   DataMemory.push_back(MB);
   return (uint8_t*)MB.base();
 }