gallivm: Properly update for removal of JITMemoryManager in LLVM 3.6.

JITMemoryManager was removed in LLVM 3.6, and replaced by its base class
RTDyldMemoryManager.

This change fixes our JIT memory managers specializations to derive from
RTDyldMemoryManager in LLVM 3.6 instead of JITMemoryManager.

This enables llvmpipe to run with LLVM 3.6.

However, lp_free_generated_code is basically a no-op because there are
not enough hook points in RTDyldMemoryManager to track and free the code
of a module.  In other words, with MCJIT, code once created, stays
forever allocated until process destruction.  This is not speicfic to
LLVM 3.6 -- it will happen whenever MCJIT is used regardless of version.

Reviewed-by: Roland Scheidegger <sroland@vmware.com>

2 files changed, 41 insertions, 38 deletions

diff --git a/src/gallium/auxiliary/gallivm/lp_bld_init.c b/src/gallium/auxiliary/gallivm/lp_bld_init.c
index b82cb77a07a..23a7c453f92 100644
--- a/src/gallium/auxiliary/gallivm/lp_bld_init.c
+++ b/src/gallium/auxiliary/gallivm/lp_bld_init.c
@@ -293,13 +293,9 @@ init_gallivm_state(struct gallivm_state *gallivm, const char *name,
    if (!gallivm->builder)
       goto fail;
 
-#if HAVE_LLVM < 0x0306
    gallivm->memorymgr = lp_get_default_memory_manager();
    if (!gallivm->memorymgr)
       goto fail;
-#else
-   gallivm->memorymgr = 0;
-#endif
 
    /* FIXME: MC-JIT only allows compiling one module at a time, and it must be
     * complete when MC-JIT is created. So defer the MC-JIT engine creation for
@@ -364,13 +360,6 @@ lp_build_init(void)
    if (gallivm_initialized)
       return TRUE;
 
-   /* XXX: Remove this once lp_bld_misc.cpp has been adapted to the removal
-    * of JITMemoryManager
-    */
-#if HAVE_LLVM >= 0x0306
-   return FALSE;
-#endif
-
 #ifdef DEBUG
    gallivm_debug = debug_get_option_gallivm_debug();
 #endif
diff --git a/src/gallium/auxiliary/gallivm/lp_bld_misc.cpp b/src/gallium/auxiliary/gallivm/lp_bld_misc.cpp
index a1d29408311..776af47909b 100644
--- a/src/gallium/auxiliary/gallivm/lp_bld_misc.cpp
+++ b/src/gallium/auxiliary/gallivm/lp_bld_misc.cpp
@@ -57,6 +57,8 @@
 #include <llvm/ADT/Triple.h>
 #if HAVE_LLVM < 0x0306
 #include <llvm/ExecutionEngine/JITMemoryManager.h>
+#else
+#include <llvm/ExecutionEngine/SectionMemoryManager.h>
 #endif
 #include <llvm/Support/CommandLine.h>
 #include <llvm/Support/Host.h>
@@ -137,19 +139,26 @@ lp_set_store_alignment(LLVMValueRef Inst,
    llvm::unwrap<llvm::StoreInst>(Inst)->setAlignment(Align);
 }
 
+
 #if HAVE_LLVM < 0x0306
+typedef llvm::JITMemoryManager BaseMemoryManager;
+#else
+typedef llvm::RTDyldMemoryManager BaseMemoryManager;
+#endif
+
 
 /*
  * Delegating is tedious but the default manager class is hidden in an
  * anonymous namespace in LLVM, so we cannot just derive from it to change
  * its behavior.
  */
-class DelegatingJITMemoryManager : public llvm::JITMemoryManager {
+class DelegatingJITMemoryManager : public BaseMemoryManager {
 
    protected:
-      virtual llvm::JITMemoryManager *mgr() const = 0;
+      virtual BaseMemoryManager *mgr() const = 0;
 
    public:
+#if HAVE_LLVM < 0x0306
       /*
        * From JITMemoryManager
        */
@@ -233,6 +242,7 @@ class DelegatingJITMemoryManager : public llvm::JITMemoryManager {
       virtual unsigned GetNumStubSlabs() {
          return mgr()->GetNumStubSlabs();
       }
+#endif
 
       /*
        * From RTDyldMemoryManager
@@ -306,14 +316,14 @@ class DelegatingJITMemoryManager : public llvm::JITMemoryManager {
  */
 class ShaderMemoryManager : public DelegatingJITMemoryManager {
 
-   llvm::JITMemoryManager *TheMM;
+   BaseMemoryManager *TheMM;
 
    struct GeneratedCode {
       typedef std::vector<void *> Vec;
       Vec FunctionBody, ExceptionTable;
-      llvm::JITMemoryManager *TheMM;
+      BaseMemoryManager *TheMM;
 
-      GeneratedCode(llvm::JITMemoryManager *MM) {
+      GeneratedCode(BaseMemoryManager *MM) {
          TheMM = MM;
       }
 
@@ -322,6 +332,7 @@ class ShaderMemoryManager : public DelegatingJITMemoryManager {
           * Deallocate things as previously requested and
           * free shared manager when no longer used.
           */
+#if HAVE_LLVM < 0x0306
          Vec::iterator i;
 
          assert(TheMM);
@@ -330,19 +341,20 @@ class ShaderMemoryManager : public DelegatingJITMemoryManager {
 #if HAVE_LLVM < 0x0304
          for ( i = ExceptionTable.begin(); i != ExceptionTable.end(); ++i )
             TheMM->deallocateExceptionTable(*i);
-#endif
+#endif /* HAVE_LLVM < 0x0304 */
+#endif /* HAVE_LLVM < 0x0306 */
       }
    };
 
    GeneratedCode *code;
 
-   llvm::JITMemoryManager *mgr() const {
+   BaseMemoryManager *mgr() const {
       return TheMM;
    }
 
    public:
 
-      ShaderMemoryManager(llvm::JITMemoryManager* MM) {
+      ShaderMemoryManager(BaseMemoryManager* MM) {
          TheMM = MM;
          code = new GeneratedCode(MM);
       }
@@ -375,7 +387,6 @@ class ShaderMemoryManager : public DelegatingJITMemoryManager {
       }
 };
 
-#endif
 
 /**
  * Same as LLVMCreateJITCompilerForModule, but:
@@ -399,11 +410,6 @@ lp_build_create_jit_compiler_for_module(LLVMExecutionEngineRef *OutJIT,
 {
    using namespace llvm;
 
-#if HAVE_LLVM >= 0x0306
-   *OutError = strdup("MCJIT not supported");
-   return 1;
-#else
-
    std::string Error;
 #if HAVE_LLVM >= 0x0306
    EngineBuilder builder(std::unique_ptr<Module>(unwrap(M)));
@@ -485,11 +491,24 @@ lp_build_create_jit_compiler_for_module(LLVMExecutionEngineRef *OutJIT,
    builder.setMCPU(MCPU);
 #endif
 
-   llvm::JITMemoryManager* JMM = reinterpret_cast<llvm::JITMemoryManager*>(CMM);
-   ShaderMemoryManager *MM = new ShaderMemoryManager(JMM);
-   *OutCode = MM->getGeneratedCode();
+   ShaderMemoryManager *MM;
+   if (useMCJIT) {
+       BaseMemoryManager* JMM = reinterpret_cast<BaseMemoryManager*>(CMM);
+       MM = new ShaderMemoryManager(JMM);
+       *OutCode = MM->getGeneratedCode();
 
-   builder.setJITMemoryManager(MM);
+       builder.setMCJITMemoryManager(MM);
+   } else {
+#if HAVE_LLVM < 0x0306
+       BaseMemoryManager* JMM = reinterpret_cast<BaseMemoryManager*>(CMM);
+       MM = new ShaderMemoryManager(JMM);
+       *OutCode = MM->getGeneratedCode();
+
+       builder.setJITMemoryManager(MM);
+#else
+       assert(0);
+#endif
+   }
 
    ExecutionEngine *JIT;
 
@@ -503,7 +522,6 @@ lp_build_create_jit_compiler_for_module(LLVMExecutionEngineRef *OutJIT,
    delete MM;
    *OutError = strdup(Error.c_str());
    return 1;
-#endif
 }
 
 
@@ -511,29 +529,25 @@ extern "C"
 void
 lp_free_generated_code(struct lp_generated_code *code)
 {
-#if HAVE_LLVM < 0x0306
    ShaderMemoryManager::freeGeneratedCode(code);
-#endif
 }
 
 extern "C"
 LLVMMCJITMemoryManagerRef
 lp_get_default_memory_manager()
 {
+   BaseMemoryManager *mm;
 #if HAVE_LLVM < 0x0306
-   llvm::JITMemoryManager *mm;
    mm = llvm::JITMemoryManager::CreateDefaultMemManager();
-   return reinterpret_cast<LLVMMCJITMemoryManagerRef>(mm);
 #else
-   return 0;
+   mm = new llvm::SectionMemoryManager();
 #endif
+   return reinterpret_cast<LLVMMCJITMemoryManagerRef>(mm);
 }
 
 extern "C"
 void
 lp_free_memory_manager(LLVMMCJITMemoryManagerRef memorymgr)
 {
-#if HAVE_LLVM < 0x0306
-   delete reinterpret_cast<llvm::JITMemoryManager*>(memorymgr);
-#endif
+   delete reinterpret_cast<BaseMemoryManager*>(memorymgr);
 }