1 files changed, 319 insertions, 42 deletions

diff --git a/src/gallium/auxiliary/gallivm/lp_bld_init.c b/src/gallium/auxiliary/gallivm/lp_bld_init.c
index 0b9a6f745f..7504cb5cf2 100644
--- a/src/gallium/auxiliary/gallivm/lp_bld_init.c
+++ b/src/gallium/auxiliary/gallivm/lp_bld_init.c
@@ -29,6 +29,8 @@
 #include "pipe/p_compiler.h"
 #include "util/u_cpu_detect.h"
 #include "util/u_debug.h"
+#include "util/u_memory.h"
+#include "util/u_simple_list.h"
 #include "lp_bld_debug.h"
 #include "lp_bld_init.h"
 
@@ -45,6 +47,7 @@ static const struct debug_named_value lp_bld_debug_flags[] = {
    { "nopt",   GALLIVM_DEBUG_NO_OPT, NULL },
    { "perf",   GALLIVM_DEBUG_PERF, NULL },
    { "no_brilinear", GALLIVM_DEBUG_NO_BRILINEAR, NULL },
+   { "gc",     GALLIVM_DEBUG_GC, NULL },
    DEBUG_NAMED_VALUE_END
 };
 
@@ -52,11 +55,7 @@ DEBUG_GET_ONCE_FLAGS_OPTION(gallivm_debug, "GALLIVM_DEBUG", lp_bld_debug_flags,
 #endif
 
 
-LLVMModuleRef lp_build_module = NULL;
-LLVMExecutionEngineRef lp_build_engine = NULL;
-LLVMModuleProviderRef lp_build_provider = NULL;
-LLVMTargetDataRef lp_build_target = NULL;
-LLVMPassManagerRef lp_build_pass = NULL;
+static boolean gallivm_initialized = FALSE;
 
 
 /*
@@ -82,6 +81,19 @@ enum LLVM_CodeGenOpt_Level {
 };
 
 
+/**
+ * LLVM 2.6 permits only one ExecutionEngine to be created.  This is it.
+ */
+static LLVMExecutionEngineRef GlobalEngine = NULL;
+
+/**
+ * Same gallivm state shared by all contexts.
+ */
+static struct gallivm_state *GlobalGallivm = NULL;
+
+
+
+
 extern void
 lp_register_oprofile_jit_event_listener(LLVMExecutionEngineRef EE);
 
@@ -89,26 +101,148 @@ extern void
 lp_set_target_options(void);
 
 
-void
-lp_build_init(void)
+
+/**
+ * Create the LLVM (optimization) pass manager and install
+ * relevant optimization passes.
+ * \return  TRUE for success, FALSE for failure
+ */
+static boolean
+create_pass_manager(struct gallivm_state *gallivm)
 {
-#ifdef DEBUG
-   gallivm_debug = debug_get_option_gallivm_debug();
+   assert(!gallivm->passmgr);
+
+   gallivm->passmgr = LLVMCreateFunctionPassManager(gallivm->provider);
+   if (!gallivm->passmgr)
+      return FALSE;
+
+   LLVMAddTargetData(gallivm->target, gallivm->passmgr);
+
+   if ((gallivm_debug & GALLIVM_DEBUG_NO_OPT) == 0) {
+      /* These are the passes currently listed in llvm-c/Transforms/Scalar.h,
+       * but there are more on SVN.
+       * TODO: Add more passes.
+       */
+      LLVMAddCFGSimplificationPass(gallivm->passmgr);
+
+      if (HAVE_LLVM >= 0x207 && sizeof(void*) == 4) {
+         /* For LLVM >= 2.7 and 32-bit build, use this order of passes to
+          * avoid generating bad code.
+          * Test with piglit glsl-vs-sqrt-zero test.
+          */
+         LLVMAddConstantPropagationPass(gallivm->passmgr);
+         LLVMAddPromoteMemoryToRegisterPass(gallivm->passmgr);
+      }
+      else {
+         LLVMAddPromoteMemoryToRegisterPass(gallivm->passmgr);
+         LLVMAddConstantPropagationPass(gallivm->passmgr);
+      }
+
+      if (util_cpu_caps.has_sse4_1) {
+         /* FIXME: There is a bug in this pass, whereby the combination
+          * of fptosi and sitofp (necessary for trunc/floor/ceil/round
+          * implementation) somehow becomes invalid code.
+          */
+         LLVMAddInstructionCombiningPass(gallivm->passmgr);
+      }
+      LLVMAddGVNPass(gallivm->passmgr);
+   }
+   else {
+      /* We need at least this pass to prevent the backends to fail in
+       * unexpected ways.
+       */
+      LLVMAddPromoteMemoryToRegisterPass(gallivm->passmgr);
+   }
+
+   return TRUE;
+}
+
+
+/**
+ * Free gallivm object's LLVM allocations, but not the gallivm object itself.
+ */
+static void
+free_gallivm_state(struct gallivm_state *gallivm)
+{
+#if HAVE_LLVM >= 0x207 /* XXX or 0x208? */
+   /* This leads to crashes w/ some versions of LLVM */
+   LLVMModuleRef mod;
+   char *error;
+
+   if (gallivm->engine && gallivm->provider)
+      LLVMRemoveModuleProvider(gallivm->engine, gallivm->provider,
+                               &mod, &error);
 #endif
 
-   lp_set_target_options();
+#if 0
+   /* XXX this seems to crash with all versions of LLVM */
+   if (gallivm->provider)
+      LLVMDisposeModuleProvider(gallivm->provider);
+#endif
 
-   LLVMInitializeNativeTarget();
+   if (gallivm->passmgr)
+      LLVMDisposePassManager(gallivm->passmgr);
 
-   LLVMLinkInJIT();
+#if HAVE_LLVM >= 0x207
+   if (gallivm->module)
+      LLVMDisposeModule(gallivm->module);
+#endif
+
+#if 0
+   /* Don't free the exec engine, it's a global/singleton */
+   if (gallivm->engine)
+      LLVMDisposeExecutionEngine(gallivm->engine);
+#endif
+
+#if 0
+   /* Don't free the TargetData, it's owned by the exec engine */
+   LLVMDisposeTargetData(gallivm->target);
+#endif
+
+   if (gallivm->context)
+      LLVMContextDispose(gallivm->context);
 
-   if (!lp_build_module)
-      lp_build_module = LLVMModuleCreateWithName("gallivm");
+   if (gallivm->builder)
+      LLVMDisposeBuilder(gallivm->builder);
+
+   gallivm->engine = NULL;
+   gallivm->target = NULL;
+   gallivm->module = NULL;
+   gallivm->provider = NULL;
+   gallivm->passmgr = NULL;
+   gallivm->context = NULL;
+   gallivm->builder = NULL;
+}
 
-   if (!lp_build_provider)
-      lp_build_provider = LLVMCreateModuleProviderForExistingModule(lp_build_module);
 
-   if (!lp_build_engine) {
+/**
+ * Allocate gallivm LLVM objects.
+ * \return  TRUE for success, FALSE for failure
+ */
+static boolean
+init_gallivm_state(struct gallivm_state *gallivm)
+{
+   assert(gallivm_initialized);
+   assert(!gallivm->context);
+   assert(!gallivm->module);
+   assert(!gallivm->provider);
+
+   gallivm->context = LLVMContextCreate();
+   if (!gallivm->context)
+      goto fail;
+
+   gallivm->module = LLVMModuleCreateWithNameInContext("gallivm",
+                                                       gallivm->context);
+   if (!gallivm->module)
+      goto fail;
+
+   gallivm->provider =
+      LLVMCreateModuleProviderForExistingModule(gallivm->module);
+   if (!gallivm->provider)
+      goto fail;
+
+   if (!GlobalEngine) {
+      /* We can only create one LLVMExecutionEngine (w/ LLVM 2.6 anyway) */
       enum LLVM_CodeGenOpt_Level optlevel;
       char *error = NULL;
 
@@ -119,43 +253,153 @@ lp_build_init(void)
          optlevel = Default;
       }
 
-      if (LLVMCreateJITCompiler(&lp_build_engine, lp_build_provider,
-                                (unsigned)optlevel, &error)) {
+      if (LLVMCreateJITCompiler(&GlobalEngine, gallivm->provider,
+                                (unsigned) optlevel, &error)) {
          _debug_printf("%s\n", error);
          LLVMDisposeMessage(error);
-         assert(0);
+         goto fail;
       }
 
 #if defined(DEBUG) || defined(PROFILE)
-      lp_register_oprofile_jit_event_listener(lp_build_engine);
+      lp_register_oprofile_jit_event_listener(GlobalEngine);
 #endif
    }
 
-   if (!lp_build_target)
-      lp_build_target = LLVMGetExecutionEngineTargetData(lp_build_engine);
-
-   if (!lp_build_pass) {
-      lp_build_pass = LLVMCreateFunctionPassManager(lp_build_provider);
-      LLVMAddTargetData(lp_build_target, lp_build_pass);
-
-      if ((gallivm_debug & GALLIVM_DEBUG_NO_OPT) == 0) {
-         /* These are the passes currently listed in llvm-c/Transforms/Scalar.h,
-          * but there are more on SVN. */
-         /* TODO: Add more passes */
-         LLVMAddCFGSimplificationPass(lp_build_pass);
-         LLVMAddPromoteMemoryToRegisterPass(lp_build_pass);
-         LLVMAddConstantPropagationPass(lp_build_pass);
-         LLVMAddInstructionCombiningPass(lp_build_pass);
-         LLVMAddGVNPass(lp_build_pass);
-      } else {
-         /* We need at least this pass to prevent the backends to fail in
-          * unexpected ways.
-          */
-         LLVMAddPromoteMemoryToRegisterPass(lp_build_pass);
+   gallivm->engine = GlobalEngine;
+
+   LLVMAddModuleProvider(gallivm->engine, gallivm->provider);//new
+
+   gallivm->target = LLVMGetExecutionEngineTargetData(gallivm->engine);
+   if (!gallivm->target)
+      goto fail;
+
+   if (!create_pass_manager(gallivm))
+      goto fail;
+
+   gallivm->builder = LLVMCreateBuilderInContext(gallivm->context);
+   if (!gallivm->builder)
+      goto fail;
+
+   return TRUE;
+
+fail:
+   free_gallivm_state(gallivm);
+   return FALSE;
+}
+
+
+struct callback
+{
+   garbage_collect_callback_func func;
+   void *cb_data;
+   struct callback *prev, *next;
+};
+
+
+/** list of all garbage collector callbacks */
+static struct callback callback_list = {NULL, NULL, NULL, NULL};
+
+
+/**
+ * Register a function with gallivm which will be called when we
+ * do garbage collection.
+ */
+void
+gallivm_register_garbage_collector_callback(garbage_collect_callback_func func,
+                                            void *cb_data)
+{
+   struct callback *cb;
+
+   if (!callback_list.prev) {
+      make_empty_list(&callback_list);
+   }
+
+   /* see if already in list */
+   foreach(cb, &callback_list) {
+      if (cb->func == func && cb->cb_data == cb_data)
+         return;
+   }
+
+   /* add to list */
+   cb = CALLOC_STRUCT(callback);
+   if (cb) {
+      cb->func = func;
+      cb->cb_data = cb_data;
+      insert_at_head(&callback_list, cb);
+   }
+}
+
+
+/**
+ * Remove a callback.
+ */
+void
+gallivm_remove_garbage_collector_callback(garbage_collect_callback_func func,
+                                          void *cb_data)
+{
+   struct callback *cb;
+
+   /* search list */
+   foreach(cb, &callback_list) {
+      if (cb->func == func && cb->cb_data == cb_data) {
+         /* found, remove it */
+         remove_from_list(cb);
+         return;
       }
    }
+}
+
+
+/**
+ * Call the callback functions (which are typically in the
+ * draw module and llvmpipe driver.
+ */
+static void
+call_garbage_collector_callbacks(void)
+{
+   struct callback *cb;
+   foreach(cb, &callback_list) {
+      cb->func(cb->cb_data);
+   }
+}
+
+
+
+/**
+ * Other gallium components using gallivm should call this periodically
+ * to let us do garbage collection (or at least try to free memory
+ * accumulated by the LLVM libraries).
+ */
+void
+gallivm_garbage_collect(struct gallivm_state *gallivm)
+{
+   if (gallivm->context) {
+      if (gallivm_debug & GALLIVM_DEBUG_GC)
+         debug_printf("***** Doing LLVM garbage collection\n");
+
+      call_garbage_collector_callbacks();
+      free_gallivm_state(gallivm);
+      init_gallivm_state(gallivm);
+   }
+}
+
+
+void
+lp_build_init(void)
+{
+#ifdef DEBUG
+   gallivm_debug = debug_get_option_gallivm_debug();
+#endif
+
+   lp_set_target_options();
+
+   LLVMInitializeNativeTarget();
+
+   LLVMLinkInJIT();
 
    util_cpu_detect();
+ 
+   gallivm_initialized = TRUE;
 
 #if 0
    /* For simulating less capable machines */
@@ -166,6 +410,39 @@ lp_build_init(void)
 }
 
 
+
+/**
+ * Create a new gallivm_state object.
+ * Note that we return a singleton.
+ */
+struct gallivm_state *
+gallivm_create(void)
+{
+   if (!GlobalGallivm) {
+      GlobalGallivm = CALLOC_STRUCT(gallivm_state);
+      if (GlobalGallivm) {
+         if (!init_gallivm_state(GlobalGallivm)) {
+            FREE(GlobalGallivm);
+            GlobalGallivm = NULL;
+         }
+      }
+   }
+   return GlobalGallivm;
+}
+
+
+/**
+ * Destroy a gallivm_state object.
+ */
+void
+gallivm_destroy(struct gallivm_state *gallivm)
+{
+   /* No-op: don't destroy the singleton */
+   (void) gallivm;
+}
+
+
+
 /* 
  * Hack to allow the linking of release LLVM static libraries on a debug build.
  *