C and Ocaml bindings for ExecutionEngine (i.e., the JIT compiler).

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45335 91177308-0d34-0410-b5e6-96231b3b80d8

8 files changed, 608 insertions, 12 deletions

diff --git a/bindings/ocaml/Makefile b/bindings/ocaml/Makefile
index 11abec4..89d05df 100644
--- a/bindings/ocaml/Makefile
+++ b/bindings/ocaml/Makefile
@@ -8,6 +8,6 @@
 ##===----------------------------------------------------------------------===##
 
 LEVEL := ../..
-DIRS = llvm bitreader bitwriter analysis
+DIRS = llvm bitreader bitwriter analysis executionengine
 
 include $(LEVEL)/Makefile.common
diff --git a/bindings/ocaml/Makefile.ocaml b/bindings/ocaml/Makefile.ocaml
index b7f4fde..6008c3a 100644
--- a/bindings/ocaml/Makefile.ocaml
+++ b/bindings/ocaml/Makefile.ocaml
@@ -41,13 +41,18 @@ OCAMLAFLAGS += $(patsubst %,-cclib %, \
                  $(filter-out -L$(LibDir),-l$(LIBRARYNAME) \
                                           $(shell $(LLVM_CONFIG) --ldflags)) \
                                           $(UsedLibs))
+ 
+ifneq ($(ENABLE_OPTIMIZED),1)
+  OCAMLDEBUGFLAG := -g
+endif
 
-Compile.CMI  := $(strip $(OCAMLC) -c $(OCAMLCFLAGS) -o)
-Compile.CMO  := $(strip $(OCAMLC) -c $(OCAMLCFLAGS) -o)
-Archive.CMA  := $(strip $(OCAMLC) -a -custom $(OCAMLAFLAGS) -o)
+Compile.CMI  := $(strip $(OCAMLC) -c $(OCAMLCFLAGS) $(OCAMLDEBUGFLAG) -o)
+Compile.CMO  := $(strip $(OCAMLC) -c $(OCAMLCFLAGS) $(OCAMLDEBUGFLAG) -o)
+Archive.CMA  := $(strip $(OCAMLC) -a -custom $(OCAMLAFLAGS) $(OCAMLDEBUGFLAG) \
+                                  -o)
 
-Compile.CMX  := $(strip $(OCAMLOPT) -c $(OCAMLCFLAGS) -o)
-Archive.CMXA := $(strip $(OCAMLOPT) -a $(OCAMLAFLAGS) -o)
+Compile.CMX  := $(strip $(OCAMLOPT) -c $(OCAMLCFLAGS) $(OCAMLDEBUGFLAG) -o)
+Archive.CMXA := $(strip $(OCAMLOPT) -a $(OCAMLAFLAGS) $(OCAMLDEBUGFLAG) -o)
 
 # Source files
 OcamlSources1 := $(sort $(wildcard $(PROJ_SRC_DIR)/*.ml))
@@ -137,6 +142,9 @@ build-deplibs: $(OutputLibs)
 $(OcamlDir)/%.a: $(LibDir)/%.a
 	$(Verb) ln -sf $< $@
 
+$(OcamlDir)/%.o: $(LibDir)/%.o
+	$(Verb) ln -sf $< $@
+
 clean-deplibs:
 	$(Verb) rm -f $(OutputLibs)
 
diff --git a/bindings/ocaml/bitreader/bitreader_ocaml.c b/bindings/ocaml/bitreader/bitreader_ocaml.c
index 87477f6..980ed2a 100644
--- a/bindings/ocaml/bitreader/bitreader_ocaml.c
+++ b/bindings/ocaml/bitreader/bitreader_ocaml.c
@@ -14,9 +14,8 @@
 
 #include "llvm-c/BitReader.h"
 #include "caml/alloc.h"
-#include "caml/mlvalues.h"
+#include "caml/fail.h"
 #include "caml/memory.h"
-#include <stdio.h>
 
 
 /* Can't use the recommended caml_named_value mechanism for backwards
@@ -29,7 +28,17 @@ CAMLprim value llvm_register_bitreader_exns(value Error) {
   return Val_unit;
 }
 
-void llvm_raise(value Prototype, char *Message);
+static void llvm_raise(value Prototype, char *Message) {
+  CAMLparam1(Prototype);
+  CAMLlocal1(CamlMessage);
+  
+  CamlMessage = copy_string(Message);
+  LLVMDisposeMessage(Message);
+  
+  raise_with_arg(Prototype, CamlMessage);
+  abort(); /* NOTREACHED */
+  CAMLnoreturn;
+}
 
 
 /*===-- Modules -----------------------------------------------------------===*/
diff --git a/bindings/ocaml/executionengine/Makefile b/bindings/ocaml/executionengine/Makefile
new file mode 100644
index 0000000..2d95b12
--- /dev/null
+++ b/bindings/ocaml/executionengine/Makefile
@@ -0,0 +1,20 @@
+##===- bindings/ocaml/executionengine/Makefile --------------*- Makefile -*-===##
+# 
+#                     The LLVM Compiler Infrastructure
+#
+# This file was developed by Gordon Henriksen and is distributed under the
+# University of Illinois Open Source License. See LICENSE.TXT for details.
+# 
+##===----------------------------------------------------------------------===##
+# 
+# This is the makefile for the Objective Caml Llvm_executionengine interface.
+# 
+##===----------------------------------------------------------------------===##
+
+LEVEL := ../../..
+LIBRARYNAME := llvm_executionengine
+DONT_BUILD_RELINKED := 1
+UsedComponents := executionengine jit interpreter native
+UsedOcamlInterfaces := llvm
+
+include ../Makefile.ocaml
diff --git a/bindings/ocaml/executionengine/executionengine_ocaml.c b/bindings/ocaml/executionengine/executionengine_ocaml.c
new file mode 100644
index 0000000..816c966
--- /dev/null
+++ b/bindings/ocaml/executionengine/executionengine_ocaml.c
@@ -0,0 +1,301 @@
+/*===-- analysis_ocaml.c - LLVM Ocaml Glue ----------------------*- C++ -*-===*\
+|*                                                                            *|
+|*                     The LLVM Compiler Infrastructure                       *|
+|*                                                                            *|
+|* This file was developed by Gordon Henriksen and is distributed under the   *|
+|* University of Illinois Open Source License. See LICENSE.TXT for details.   *|
+|*                                                                            *|
+|*===----------------------------------------------------------------------===*|
+|*                                                                            *|
+|* This file glues LLVM's ocaml interface to its C interface. These functions *|
+|* are by and large transparent wrappers to the corresponding C functions.    *|
+|*                                                                            *|
+|* Note that these functions intentionally take liberties with the CAMLparamX *|
+|* macros, since most of the parameters are not GC heap objects.              *|
+|*                                                                            *|
+\*===----------------------------------------------------------------------===*/
+
+#include "llvm-c/ExecutionEngine.h"
+#include "caml/alloc.h"
+#include "caml/custom.h"
+#include "caml/fail.h"
+#include "caml/memory.h"
+#include <string.h>
+#include <assert.h>
+
+
+/* Can't use the recommended caml_named_value mechanism for backwards
+   compatibility reasons. This is largely equivalent. */
+static value llvm_ee_error_exn;
+
+CAMLprim value llvm_register_ee_exns(value Error) {
+  llvm_ee_error_exn = Field(Error, 0);
+  register_global_root(&llvm_ee_error_exn);
+  return Val_unit;
+}
+
+static void llvm_raise(value Prototype, char *Message) {
+  CAMLparam1(Prototype);
+  CAMLlocal1(CamlMessage);
+  
+  CamlMessage = copy_string(Message);
+  LLVMDisposeMessage(Message);
+  
+  raise_with_arg(Prototype, CamlMessage);
+  abort(); /* NOTREACHED */
+  CAMLnoreturn;
+}
+
+
+/*--... Operations on generic values .......................................--*/
+
+#define Genericvalue_val(v)  (*(LLVMGenericValueRef *)(Data_custom_val(v)))
+
+static void llvm_finalize_generic_value(value GenVal) {
+  LLVMDisposeGenericValue(Genericvalue_val(GenVal));
+}
+
+static struct custom_operations generic_value_ops = {
+  (char *) "LLVMGenericValue",
+  llvm_finalize_generic_value,
+  custom_compare_default,
+  custom_hash_default,
+  custom_serialize_default,
+  custom_deserialize_default
+};
+
+static value alloc_generic_value(LLVMGenericValueRef Ref) {
+  value Val = alloc_custom(&generic_value_ops, sizeof(LLVMGenericValueRef), 0, 1);
+  Genericvalue_val(Val) = Ref;
+  return Val;
+}
+
+/* Llvm.lltype -> float -> t */
+CAMLprim value llvm_genericvalue_of_float(LLVMTypeRef Ty, value N) {
+  return alloc_generic_value(LLVMCreateGenericValueOfFloat(Ty, Double_val(N)));
+}
+
+/* 'a -> t */
+CAMLprim value llvm_genericvalue_of_value(value V) {
+  return alloc_generic_value(LLVMCreateGenericValueOfPointer(Op_val(V)));
+}
+
+/* Llvm.lltype -> int -> t */
+CAMLprim value llvm_genericvalue_of_int(LLVMTypeRef Ty, value Int) {
+  return alloc_generic_value(LLVMCreateGenericValueOfInt(Ty, Int_val(Int), 1));
+}
+
+/* Llvm.lltype -> int32 -> t */
+CAMLprim value llvm_genericvalue_of_int32(LLVMTypeRef Ty, value Int32) {
+  return alloc_generic_value(LLVMCreateGenericValueOfInt(Ty, Int32_val(Int32),
+                                                         1));
+}
+
+/* Llvm.lltype -> nativeint -> t */
+CAMLprim value llvm_genericvalue_of_nativeint(LLVMTypeRef Ty, value NatInt) {
+  return alloc_generic_value(LLVMCreateGenericValueOfInt(Ty,
+                                                         Nativeint_val(NatInt),
+                                                         1));
+}
+
+/* Llvm.lltype -> int64 -> t */
+CAMLprim value llvm_genericvalue_of_int64(LLVMTypeRef Ty, value Int64) {
+  return alloc_generic_value(LLVMCreateGenericValueOfInt(Ty, Int64_val(Int64),
+                                                         1));
+}
+
+/* Llvm.lltype -> t -> float */
+CAMLprim value llvm_genericvalue_as_float(LLVMTypeRef Ty, value GenVal) {
+  return copy_double(LLVMGenericValueToFloat(Ty, Genericvalue_val(GenVal)));
+}
+
+/* t -> 'a */
+CAMLprim value llvm_genericvalue_as_value(value GenVal) {
+  return Val_op(LLVMGenericValueToPointer(Genericvalue_val(GenVal)));
+}
+
+/* t -> int */
+CAMLprim value llvm_genericvalue_as_int(value GenVal) {
+  assert(LLVMGenericValueIntWidth(Genericvalue_val(GenVal)) <= 8 * sizeof(value)
+         && "Generic value too wide to treat as an int!");
+  return Val_int(LLVMGenericValueToInt(Genericvalue_val(GenVal), 1));
+}
+
+/* t -> int32 */
+CAMLprim value llvm_genericvalue_as_int32(value GenVal) {
+  assert(LLVMGenericValueIntWidth(Genericvalue_val(GenVal)) <= 32
+         && "Generic value too wide to treat as an int32!");
+  return copy_int32(LLVMGenericValueToInt(Genericvalue_val(GenVal), 1));
+}
+
+/* t -> int64 */
+CAMLprim value llvm_genericvalue_as_int64(value GenVal) {
+  assert(LLVMGenericValueIntWidth(Genericvalue_val(GenVal)) <= 64
+         && "Generic value too wide to treat as an int64!");
+  return copy_int64(LLVMGenericValueToInt(Genericvalue_val(GenVal), 1));
+}
+
+/* t -> nativeint */
+CAMLprim value llvm_genericvalue_as_nativeint(value GenVal) {
+  assert(LLVMGenericValueIntWidth(Genericvalue_val(GenVal)) <= 8 * sizeof(value)
+         && "Generic value too wide to treat as a nativeint!");
+  return copy_nativeint(LLVMGenericValueToInt(Genericvalue_val(GenVal),1));
+}
+
+
+/*--... Operations on execution engines ....................................--*/
+
+/* llmoduleprovider -> ExecutionEngine.t */
+CAMLprim LLVMExecutionEngineRef llvm_ee_create(LLVMModuleProviderRef MP) {
+  LLVMExecutionEngineRef Interp;
+  char *Error;
+  if (LLVMCreateExecutionEngine(&Interp, MP, &Error))
+    llvm_raise(llvm_ee_error_exn, Error);
+  return Interp;
+}
+
+/* llmoduleprovider -> ExecutionEngine.t */
+CAMLprim LLVMExecutionEngineRef
+llvm_ee_create_interpreter(LLVMModuleProviderRef MP) {
+  LLVMExecutionEngineRef Interp;
+  char *Error;
+  if (LLVMCreateInterpreter(&Interp, MP, &Error))
+    llvm_raise(llvm_ee_error_exn, Error);
+  return Interp;
+}
+
+/* llmoduleprovider -> ExecutionEngine.t */
+CAMLprim LLVMExecutionEngineRef
+llvm_ee_create_jit(LLVMModuleProviderRef MP) {
+  LLVMExecutionEngineRef JIT;
+  char *Error;
+  if (LLVMCreateJITCompiler(&JIT, MP, &Error))
+    llvm_raise(llvm_ee_error_exn, Error);
+  return JIT;
+}
+
+/* ExecutionEngine.t -> unit */
+CAMLprim value llvm_ee_dispose(LLVMExecutionEngineRef EE) {
+  LLVMDisposeExecutionEngine(EE);
+  return Val_unit;
+}
+
+/* llmoduleprovider -> ExecutionEngine.t -> unit */
+CAMLprim value llvm_ee_add_mp(LLVMModuleProviderRef MP,
+                              LLVMExecutionEngineRef EE) {
+  LLVMAddModuleProvider(EE, MP);
+  return Val_unit;
+}
+
+/* llmoduleprovider -> ExecutionEngine.t -> llmodule */
+CAMLprim LLVMModuleRef llvm_ee_remove_mp(LLVMModuleProviderRef MP,
+                                         LLVMExecutionEngineRef EE) {
+  LLVMModuleRef RemovedModule;
+  char *Error;
+  if (LLVMRemoveModuleProvider(EE, MP, &RemovedModule, &Error))
+    llvm_raise(llvm_ee_error_exn, Error);
+  return RemovedModule;
+}
+
+/* string -> ExecutionEngine.t -> llvalue option */
+CAMLprim value llvm_ee_find_function(value Name, LLVMExecutionEngineRef EE) {
+  CAMLparam1(Name);
+  CAMLlocal1(Option);
+  LLVMValueRef Found;
+  if (LLVMFindFunction(EE, String_val(Name), &Found))
+    CAMLreturn(Val_unit);
+  Option = alloc(1, 1);
+  Field(Option, 0) = Val_op(Found);
+  CAMLreturn(Option);
+}
+
+/* llvalue -> GenericValue.t array -> ExecutionEngine.t -> GenericValue.t */
+CAMLprim value llvm_ee_run_function(LLVMValueRef F, value Args,
+                                    LLVMExecutionEngineRef EE) {
+  unsigned NumArgs;
+  LLVMGenericValueRef Result, *GVArgs;
+  unsigned I;
+  
+  NumArgs = Wosize_val(Args);
+  GVArgs = (LLVMGenericValueRef*) malloc(NumArgs * sizeof(LLVMGenericValueRef));
+  for (I = 0; I != NumArgs; ++I)
+    GVArgs[I] = Genericvalue_val(Field(Args, I));
+  
+  Result = LLVMRunFunction(EE, F, NumArgs, GVArgs);
+  
+  free(GVArgs);
+  return alloc_generic_value(Result);
+}
+
+/* ExecutionEngine.t -> unit */
+CAMLprim value llvm_ee_run_static_ctors(LLVMExecutionEngineRef EE) {
+  LLVMRunStaticConstructors(EE);
+  return Val_unit;
+}
+
+/* ExecutionEngine.t -> unit */
+CAMLprim value llvm_ee_run_static_dtors(LLVMExecutionEngineRef EE) {
+  LLVMRunStaticDestructors(EE);
+  return Val_unit;
+}
+
+/* llvalue -> string array -> (string * string) array -> ExecutionEngine.t ->
+   int */
+CAMLprim value llvm_ee_run_function_as_main(LLVMValueRef F,
+                                            value Args, value Env,
+                                            LLVMExecutionEngineRef EE) {
+  CAMLparam2(Args, Env);
+  int I, NumArgs, NumEnv, EnvSize, Result;
+  const char **CArgs, **CEnv;
+  char *CEnvBuf, *Pos;
+  
+  NumArgs = Wosize_val(Args);
+  NumEnv = Wosize_val(Env);
+  
+  /* Build the environment. */
+  CArgs = (const char **) malloc(NumArgs * sizeof(char*));
+  for (I = 0; I != NumArgs; ++I)
+    CArgs[I] = String_val(Field(Args, I));
+  
+  /* Compute the size of the environment string buffer. */
+  for (I = 0, EnvSize = 0; I != NumEnv; ++I) {
+    EnvSize += strlen(String_val(Field(Field(Env, I), 0))) + 1;
+    EnvSize += strlen(String_val(Field(Field(Env, I), 1))) + 1;
+  }
+  
+  /* Build the environment. */
+  CEnv = (const char **) malloc((NumEnv + 1) * sizeof(char*));
+  CEnvBuf = (char*) malloc(EnvSize);
+  Pos = CEnvBuf;
+  for (I = 0; I != NumEnv; ++I) {
+    char *Name  = String_val(Field(Field(Env, I), 0)),
+         *Value = String_val(Field(Field(Env, I), 1));
+    int NameLen  = strlen(Name),
+        ValueLen = strlen(Value);
+    
+    CEnv[I] = Pos;
+    memcpy(Pos, Name, NameLen);
+    Pos += NameLen;
+    *Pos++ = '=';
+    memcpy(Pos, Value, ValueLen);
+    Pos += ValueLen;
+    *Pos++ = '\0';
+  }
+  CEnv[NumEnv] = NULL;
+  
+  Result = LLVMRunFunctionAsMain(EE, F, NumArgs, CArgs, CEnv);
+  
+  free(CArgs);
+  free(CEnv);
+  free(CEnvBuf);
+  
+  CAMLreturn(Val_int(Result));
+}
+
+/* llvalue -> ExecutionEngine.t -> unit */
+CAMLprim value llvm_ee_free_machine_code(LLVMValueRef F,
+                                         LLVMExecutionEngineRef EE) {
+  LLVMFreeMachineCodeForFunction(EE, F);
+  return Val_unit;
+}
+
diff --git a/bindings/ocaml/executionengine/llvm_executionengine.ml b/bindings/ocaml/executionengine/llvm_executionengine.ml
new file mode 100644
index 0000000..072e249
--- /dev/null
+++ b/bindings/ocaml/executionengine/llvm_executionengine.ml
@@ -0,0 +1,106 @@
+(*===-- llvm_executionengine.ml - LLVM Ocaml Interface ----------*- C++ -*-===*
+ *
+ *                     The LLVM Compiler Infrastructure
+ *
+ * This file was developed by Gordon Henriksen and is distributed under the
+ * University of Illinois Open Source License. See LICENSE.TXT for details.
+ *
+ *===----------------------------------------------------------------------===*)
+
+
+exception Error of string
+
+external register_exns: exn -> unit
+  = "llvm_register_ee_exns"
+
+
+module GenericValue = struct
+  type t
+  
+  external of_float: Llvm.lltype -> float -> t
+    = "llvm_genericvalue_of_float"
+  external of_pointer: 'a -> t
+    = "llvm_genericvalue_of_value"
+  external of_int32: Llvm.lltype -> int32 -> t
+    = "llvm_genericvalue_of_int32"
+  external of_int: Llvm.lltype -> int -> t
+    = "llvm_genericvalue_of_int"
+  external of_nativeint: Llvm.lltype -> nativeint -> t
+    = "llvm_genericvalue_of_nativeint"
+  external of_int64: Llvm.lltype -> int64 -> t
+    = "llvm_genericvalue_of_int64"
+  
+  external as_float: Llvm.lltype -> t -> float
+    = "llvm_genericvalue_as_float"
+  external as_pointer: t -> 'a
+    = "llvm_genericvalue_as_value"
+  external as_int32: t -> int32
+    = "llvm_genericvalue_as_int32"
+  external as_int: t -> int
+    = "llvm_genericvalue_as_int"
+  external as_nativeint: t -> nativeint
+    = "llvm_genericvalue_as_nativeint"
+  external as_int64: t -> int64
+    = "llvm_genericvalue_as_int64"
+end
+
+
+module ExecutionEngine = struct
+  type t
+  
+  (* FIXME: Ocaml is not running this setup code unless we use 'val' in the
+            interface, which causes the emission of a stub for each function;
+            using 'external' in the module allows direct calls into 
+            ocaml_executionengine.c. This is hardly fatal, but it is unnecessary
+            overhead on top of the two stubs that are already invoked for each 
+            call into LLVM. *)
+  let _ = register_exns (Error "")
+  
+  external create: Llvm.llmoduleprovider -> t
+    = "llvm_ee_create"
+  external create_interpreter: Llvm.llmoduleprovider -> t
+    = "llvm_ee_create_interpreter"
+  external create_jit: Llvm.llmoduleprovider -> t
+    = "llvm_ee_create_jit"
+  external dispose: t -> unit
+    = "llvm_ee_dispose"
+  external add_module_provider: Llvm.llmoduleprovider -> t -> unit
+    = "llvm_ee_add_mp"
+  external remove_module_provider: Llvm.llmoduleprovider -> t -> Llvm.llmodule
+    = "llvm_ee_remove_mp"
+  external find_function: string -> t -> Llvm.llvalue option
+    = "llvm_ee_find_function"
+  external run_function: Llvm.llvalue -> GenericValue.t array -> t ->
+                         GenericValue.t
+    = "llvm_ee_run_function"
+  external run_static_ctors: t -> unit
+    = "llvm_ee_run_static_ctors"
+  external run_static_dtors: t -> unit
+    = "llvm_ee_run_static_dtors"
+  external run_function_as_main: Llvm.llvalue -> string array ->
+                                 (string * string) array -> t -> int
+    = "llvm_ee_run_function_as_main"
+  external free_machine_code: Llvm.llvalue -> t -> unit
+    = "llvm_ee_free_machine_code"
+  
+  (* The following are not bound. Patches are welcome.
+  
+  get_target_data: t -> lltargetdata
+  add_global_mapping: llvalue -> llgenericvalue -> t -> unit
+  clear_all_global_mappings: t -> unit
+  update_global_mapping: llvalue -> llgenericvalue -> t -> unit
+  get_pointer_to_global_if_available: llvalue -> t -> llgenericvalue
+  get_pointer_to_global: llvalue -> t -> llgenericvalue
+  get_pointer_to_function: llvalue -> t -> llgenericvalue
+  get_pointer_to_function_or_stub: llvalue -> t -> llgenericvalue
+  get_global_value_at_address: llgenericvalue -> t -> llvalue option
+  store_value_to_memory: llgenericvalue -> llgenericvalue -> lltype -> unit
+  initialize_memory: llvalue -> llgenericvalue -> t -> unit
+  recompile_and_relink_function: llvalue -> t -> llgenericvalue
+  get_or_emit_global_variable: llvalue -> t -> llgenericvalue
+  disable_lazy_compilation: t -> unit
+  lazy_compilation_enabled: t -> bool
+  install_lazy_function_creator: (string -> llgenericvalue) -> t -> unit
+  
+   *)
+end
diff --git a/bindings/ocaml/executionengine/llvm_executionengine.mli b/bindings/ocaml/executionengine/llvm_executionengine.mli
new file mode 100644
index 0000000..a359774
--- /dev/null
+++ b/bindings/ocaml/executionengine/llvm_executionengine.mli
@@ -0,0 +1,152 @@
+(*===-- llvm_executionengine.mli - LLVM Ocaml Interface ---------*- C++ -*-===*
+ *
+ *                     The LLVM Compiler Infrastructure
+ *
+ * This file was developed by Gordon Henriksen and is distributed under the
+ * University of Illinois Open Source License. See LICENSE.TXT for details.
+ *
+ *===----------------------------------------------------------------------===
+ *
+ * This interface provides an ocaml API for LLVM execution engine (JIT/
+ * interpreter), the classes in the ExecutionEngine library.
+ *
+ *===----------------------------------------------------------------------===*)
+
+
+exception Error of string
+
+
+module GenericValue: sig
+  (** [GenericValue.t] is a boxed union type used to portably pass arguments to
+      and receive values from the execution engine. It supports only a limited
+      selection of types; for more complex argument types, it is necessary to
+      generate a stub function by hand or to pass parameters by reference.
+      See the struct [llvm::GenericValue]. **)
+  type t
+  
+  (** [of_float fpty n] boxes the float [n] in a float-valued generic value
+      according to the floating point type [fpty]. See the fields 
+      [llvm::GenericValue::DoubleVal] and [llvm::GenericValue::FloatVal]. **)
+  val of_float: Llvm.lltype -> float -> t
+  
+  (** [of_pointer v] boxes the pointer value [v] in a generic value. See the
+      field [llvm::GenericValue::PointerVal]. **)
+  val of_pointer: 'a -> t
+  
+  (** [of_int32 n w] boxes the int32 [i] in a generic value with the bitwidth
+      [w]. See the field [llvm::GenericValue::IntVal]. **)
+  val of_int32: Llvm.lltype -> int32 -> t
+  
+  (** [of_int n w] boxes the int [i] in a generic value with the bitwidth
+      [w]. See the field [llvm::GenericValue::IntVal]. **)
+  val of_int: Llvm.lltype -> int -> t
+  
+  (** [of_natint n w] boxes the native int [i] in a generic value with the
+      bitwidth [w]. See the field [llvm::GenericValue::IntVal]. **)
+  val of_nativeint: Llvm.lltype -> nativeint -> t
+  
+  (** [of_int64 n w] boxes the int64 [i] in a generic value with the bitwidth
+      [w]. See the field [llvm::GenericValue::IntVal]. **)
+  val of_int64: Llvm.lltype -> int64 -> t
+  
+  (** [as_float fpty gv] unboxes the floating point-valued generic value [gv] of
+      floating point type [fpty]. See the fields [llvm::GenericValue::DoubleVal]
+      and [llvm::GenericValue::FloatVal]. **)
+  val as_float: Llvm.lltype -> t -> float
+  
+  (** [as_pointer gv] unboxes the pointer-valued generic value [gv]. See the
+      field [llvm::GenericValue::PointerVal]. **)
+  val as_pointer: t -> 'a
+  
+  (** [as_int32 gv] unboxes the integer-valued generic value [gv] as an [int32].
+      Is invalid if [gv] has a bitwidth greater than 32 bits. See the field
+      [llvm::GenericValue::IntVal]. **)
+  val as_int32: t -> int32
+  
+  (** [as_int gv] unboxes the integer-valued generic value [gv] as an [int].
+      Is invalid if [gv] has a bitwidth greater than the host bit width (but the
+      most significant bit may be lost). See the field
+      [llvm::GenericValue::IntVal]. **)
+  val as_int: t -> int
+  
+  (** [as_natint gv] unboxes the integer-valued generic value [gv] as a
+      [nativeint]. Is invalid if [gv] has a bitwidth greater than
+      [nativeint]. See the field [llvm::GenericValue::IntVal]. **)
+  val as_nativeint: t -> nativeint
+  
+  (** [as_int64 gv] returns the integer-valued generic value [gv] as an [int64].
+      Is invalid if [gv] has a bitwidth greater than [int64]. See the field
+      [llvm::GenericValue::IntVal]. **)
+  val as_int64: t -> int64
+end
+
+
+module ExecutionEngine: sig
+  (** An execution engine is either a JIT compiler or an interpreter, capable of
+      directly loading an LLVM module and executing its functions without first
+      invoking a static compiler and generating a native executable. **)
+  type t
+  
+  (** [create mp] creates a new execution engine, taking ownership of the
+      module provider [mp] if successful. Creates a JIT if possible, else falls
+      back to an interpreter. Raises [Error msg] if an error occurrs. The
+      execution engine is not garbage collected and must be destroyed with
+      [dispose ee]. See the function [llvm::ExecutionEngine::create]. **)
+  val create: Llvm.llmoduleprovider -> t
+  
+  (** [create_interpreter mp] creates a new interpreter, taking ownership of the
+      module provider [mp] if successful. Raises [Error msg] if an error
+      occurrs. The execution engine is not garbage collected and must be
+      destroyed with [dispose ee].
+      See the function [llvm::ExecutionEngine::create]. **)
+  val create_interpreter: Llvm.llmoduleprovider -> t
+  
+  (** [create_jit mp] creates a new JIT (just-in-time compiler), taking
+      ownership of the module provider [mp] if successful. Raises [Error msg] if
+      an error occurrs. The execution engine is not garbage collected and must
+      be destroyed with [dispose ee].
+      See the function [llvm::ExecutionEngine::create]. **)
+  val create_jit: Llvm.llmoduleprovider -> t
+  
+  (** [dispose ee] releases the memory used by the execution engine and must be
+      invoked to avoid memory leaks. **)
+  val dispose: t -> unit
+  
+  (** [add_module_provider mp ee] adds the module provider [mp] to the execution
+      engine [ee]. **)
+  val add_module_provider: Llvm.llmoduleprovider -> t -> unit
+  
+  (** [remove_module_provider mp ee] removes the module provider [mp] from the
+      execution engine [ee], disposing of [mp] and the module referenced by
+      [mp]. Raises [Error msg] if an error occurs. **)
+  val remove_module_provider: Llvm.llmoduleprovider -> t -> Llvm.llmodule
+  
+  (** [find_function n ee] finds the function named [n] defined in any of the 
+      modules owned by the execution engine [ee]. Returns [None] if the function
+      is not found and [Some f] otherwise. **)
+  val find_function: string -> t -> Llvm.llvalue option
+  
+  (** [run_function f args ee] synchronously executes the function [f] with the
+      arguments [args], which must be compatible with the parameter types. **)
+  val run_function: Llvm.llvalue -> GenericValue.t array -> t ->
+                    GenericValue.t
+  
+  (** [run_static_ctors ee] executes the static constructors of each module in
+      the execution engine [ee]. **)
+  val run_static_ctors: t -> unit
+  
+  (** [run_static_dtors ee] executes the static destructors of each module in
+      the execution engine [ee]. **)
+  val run_static_dtors: t -> unit
+  
+  (** [run_function_as_main f args env ee] executes the function [f] as a main 
+      function, passing it [argv] and [argc] according to the string array
+      [args], and [envp] as specified by the array [env]. Returns the integer 
+      return value of the function. **)
+  val run_function_as_main: Llvm.llvalue -> string array ->
+                            (string * string) array -> t -> int
+  
+  (** [free_machine_code f ee] releases the memory in the execution engine [ee]
+      used to store the machine code for the function [f]. **)
+  val free_machine_code: Llvm.llvalue -> t -> unit
+end
diff --git a/bindings/ocaml/llvm/llvm_ocaml.c b/bindings/ocaml/llvm/llvm_ocaml.c
index 506b529..7224439 100644
--- a/bindings/ocaml/llvm/llvm_ocaml.c
+++ b/bindings/ocaml/llvm/llvm_ocaml.c
@@ -18,7 +18,6 @@
 #include "llvm-c/Core.h"
 #include "caml/alloc.h"
 #include "caml/custom.h"
-#include "caml/mlvalues.h"
 #include "caml/memory.h"
 #include "caml/fail.h"
 #include "caml/callback.h"
@@ -37,7 +36,7 @@ CAMLprim value llvm_register_core_exns(value IoError) {
   return Val_unit;
 }
 
-void llvm_raise(value Prototype, char *Message) {
+static void llvm_raise(value Prototype, char *Message) {
   CAMLparam1(Prototype);
   CAMLlocal1(CamlMessage);
   
@@ -45,6 +44,7 @@ void llvm_raise(value Prototype, char *Message) {
   LLVMDisposeMessage(Message);
   
   raise_with_arg(Prototype, CamlMessage);
+  abort(); /* NOTREACHED */
   CAMLnoreturn;
 }
 
@@ -234,7 +234,7 @@ CAMLprim LLVMTypeRef llvm_opaque_type(value Unit) {
 
 #define Typehandle_val(v)  (*(LLVMTypeHandleRef *)(Data_custom_val(v)))
 
-void llvm_finalize_handle(value TH) {
+static void llvm_finalize_handle(value TH) {
   LLVMDisposeTypeHandle(Typehandle_val(TH));
 }