Revert "[ORC] Switch from shared_ptr to unique_ptr for addModule methods."

This reverts commit r327566, it breaks
test/ExecutionEngine/OrcMCJIT/test-global-ctors.ll.

The test doesn't crash with a stack trace, unfortunately. It merely
returns 1 as the exit code.

ASan didn't produce a report, and I reproduced this on my Linux machine
and Windows box.

llvm-svn: 327576

1 files changed, 30 insertions, 2 deletions

diff --git a/llvm/include/llvm-c/OrcBindings.h b/llvm/include/llvm-c/OrcBindings.h
index fda43edd7bb..95bdef81593 100644
--- a/llvm/include/llvm-c/OrcBindings.h
+++ b/llvm/include/llvm-c/OrcBindings.h
@@ -29,6 +29,7 @@
 extern "C" {
 #endif
 
+typedef struct LLVMOpaqueSharedModule *LLVMSharedModuleRef;
 typedef struct LLVMOrcOpaqueJITStack *LLVMOrcJITStackRef;
 typedef uint64_t LLVMOrcModuleHandle;
 typedef uint64_t LLVMOrcTargetAddress;
@@ -39,6 +40,33 @@ typedef uint64_t (*LLVMOrcLazyCompileCallbackFn)(LLVMOrcJITStackRef JITStack,
 typedef enum { LLVMOrcErrSuccess = 0, LLVMOrcErrGeneric } LLVMOrcErrorCode;
 
 /**
+ * Turn an LLVMModuleRef into an LLVMSharedModuleRef.
+ *
+ * The JIT uses shared ownership for LLVM modules, since it is generally
+ * difficult to know when the JIT will be finished with a module (and the JIT
+ * has no way of knowing when a user may be finished with one).
+ *
+ * Calling this method with an LLVMModuleRef creates a shared-pointer to the
+ * module, and returns a reference to this shared pointer.
+ *
+ * The shared module should be disposed when finished with by calling
+ * LLVMOrcDisposeSharedModule (not LLVMDisposeModule). The Module will be
+ * deleted when the last shared pointer owner relinquishes it.
+ */
+
+LLVMSharedModuleRef LLVMOrcMakeSharedModule(LLVMModuleRef Mod);
+
+/**
+ * Dispose of a shared module.
+ *
+ * The module should not be accessed after this call. The module will be
+ * deleted once all clients (including the JIT itself) have released their
+ * shared pointers.
+ */
+
+void LLVMOrcDisposeSharedModuleRef(LLVMSharedModuleRef SharedMod);
+
+/**
  * Create an ORC JIT stack.
  *
  * The client owns the resulting stack, and must call OrcDisposeInstance(...)
@@ -98,7 +126,7 @@ LLVMOrcErrorCode LLVMOrcSetIndirectStubPointer(LLVMOrcJITStackRef JITStack,
 LLVMOrcErrorCode
 LLVMOrcAddEagerlyCompiledIR(LLVMOrcJITStackRef JITStack,
                             LLVMOrcModuleHandle *RetHandle,
-                            LLVMModuleRef Mod,
+                            LLVMSharedModuleRef Mod,
                             LLVMOrcSymbolResolverFn SymbolResolver,
                             void *SymbolResolverCtx);
 
@@ -108,7 +136,7 @@ LLVMOrcAddEagerlyCompiledIR(LLVMOrcJITStackRef JITStack,
 LLVMOrcErrorCode
 LLVMOrcAddLazilyCompiledIR(LLVMOrcJITStackRef JITStack,
                            LLVMOrcModuleHandle *RetHandle,
-                           LLVMModuleRef Mod,
+                           LLVMSharedModuleRef Mod,
                            LLVMOrcSymbolResolverFn SymbolResolver,
                            void *SymbolResolverCtx);