/*===-- llvm_ocaml.c - LLVM Ocaml Glue --------------------------*- C++ -*-===*\
|*                                                                            *|
|*                     The LLVM Compiler Infrastructure                       *|
|*                                                                            *|
|* This file 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/Core.h"
#include "caml/alloc.h"
#include "caml/custom.h"
#include "caml/memory.h"
#include "caml/fail.h"
#include "caml/callback.h"
#include "llvm/Config/config.h"
#include <assert.h>
#include <stdlib.h>


/* Can't use the recommended caml_named_value mechanism for backwards
   compatibility reasons. This is largely equivalent. */
static value llvm_ioerror_exn;

CAMLprim value llvm_register_core_exns(value IoError) {
  llvm_ioerror_exn = Field(IoError, 0);
  register_global_root(&llvm_ioerror_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 */
#ifdef CAMLnoreturn
  CAMLnoreturn; /* Silences warnings, but is missing in some versions. */
#endif
}


/*===-- Modules -----------------------------------------------------------===*/

/* string -> llmodule */
CAMLprim LLVMModuleRef llvm_create_module(value ModuleID) {
  return LLVMModuleCreateWithName(String_val(ModuleID));
}

/* llmodule -> unit */
CAMLprim value llvm_dispose_module(LLVMModuleRef M) {
  LLVMDisposeModule(M);
  return Val_unit;
}

/* llmodule -> string */
CAMLprim value llvm_target_triple(LLVMModuleRef M) {
  return copy_string(LLVMGetTarget(M));
}

/* string -> llmodule -> unit */
CAMLprim value llvm_set_target_triple(value Trip, LLVMModuleRef M) {
  LLVMSetTarget(M, String_val(Trip));
  return Val_unit;
}

/* llmodule -> string */
CAMLprim value llvm_data_layout(LLVMModuleRef M) {
  return copy_string(LLVMGetDataLayout(M));
}

/* string -> llmodule -> unit */
CAMLprim value llvm_set_data_layout(value Layout, LLVMModuleRef M) {
  LLVMSetDataLayout(M, String_val(Layout));
  return Val_unit;
}

/* string -> lltype -> llmodule -> bool */
CAMLprim value llvm_add_type_name(value Name, LLVMTypeRef Ty, LLVMModuleRef M) {
  int res = LLVMAddTypeName(M, String_val(Name), Ty);
  return Val_bool(res == 0);
}

/* string -> llmodule -> unit */
CAMLprim value llvm_delete_type_name(value Name, LLVMModuleRef M) {
  LLVMDeleteTypeName(M, String_val(Name));
  return Val_unit;
}


/*===-- Types -------------------------------------------------------------===*/

/* lltype -> TypeKind.t */
CAMLprim value llvm_classify_type(LLVMTypeRef Ty) {
  return Val_int(LLVMGetTypeKind(Ty));
}

/*--... Operations on integer types ........................................--*/

/* unit -> lltype */
CAMLprim LLVMTypeRef llvm_i1_type (value Unit) { return LLVMInt1Type();  }
CAMLprim LLVMTypeRef llvm_i8_type (value Unit) { return LLVMInt8Type();  }
CAMLprim LLVMTypeRef llvm_i16_type(value Unit) { return LLVMInt16Type(); }
CAMLprim LLVMTypeRef llvm_i32_type(value Unit) { return LLVMInt32Type(); }
CAMLprim LLVMTypeRef llvm_i64_type(value Unit) { return LLVMInt64Type(); }

/* int -> lltype */
CAMLprim LLVMTypeRef llvm_integer_type(value Width) {
  return LLVMIntType(Int_val(Width));
}

/* lltype -> int */
CAMLprim value llvm_integer_bitwidth(LLVMTypeRef IntegerTy) {
  return Val_int(LLVMGetIntTypeWidth(IntegerTy));
}

/*--... Operations on real types ...........................................--*/

/* unit -> lltype */
CAMLprim LLVMTypeRef llvm_float_type(value Unit) {
  return LLVMFloatType();
}

/* unit -> lltype */
CAMLprim LLVMTypeRef llvm_double_type(value Unit) {
  return LLVMDoubleType();
}

/* unit -> lltype */
CAMLprim LLVMTypeRef llvm_x86fp80_type(value Unit) {
  return LLVMX86FP80Type();
}

/* unit -> lltype */
CAMLprim LLVMTypeRef llvm_fp128_type(value Unit) {
  return LLVMFP128Type();
}

/* unit -> lltype */
CAMLprim LLVMTypeRef llvm_ppc_fp128_type(value Unit) {
  return LLVMPPCFP128Type();
}

/*--... Operations on function types .......................................--*/

/* lltype -> lltype array -> lltype */
CAMLprim LLVMTypeRef llvm_function_type(LLVMTypeRef RetTy, value ParamTys) {
  return LLVMFunctionType(RetTy, (LLVMTypeRef *) ParamTys,
                          Wosize_val(ParamTys), 0);
}

/* lltype -> lltype array -> lltype */
CAMLprim LLVMTypeRef llvm_var_arg_function_type(LLVMTypeRef RetTy,
                                                value ParamTys) {
  return LLVMFunctionType(RetTy, (LLVMTypeRef *) ParamTys,
                          Wosize_val(ParamTys), 1);
}

/* lltype -> bool */
CAMLprim value llvm_is_var_arg(LLVMTypeRef FunTy) {
  return Val_bool(LLVMIsFunctionVarArg(FunTy));
}

/* lltype -> lltype array */
CAMLprim value llvm_param_types(LLVMTypeRef FunTy) {
  value Tys = alloc(LLVMCountParamTypes(FunTy), 0);
  LLVMGetParamTypes(FunTy, (LLVMTypeRef *) Tys);
  return Tys;
}

/*--... Operations on struct types .........................................--*/

/* lltype array -> lltype */
CAMLprim LLVMTypeRef llvm_struct_type(value ElementTypes) {
  return LLVMStructType((LLVMTypeRef *) ElementTypes,
                        Wosize_val(ElementTypes), 0);
}

/* lltype array -> lltype */
CAMLprim LLVMTypeRef llvm_packed_struct_type(value ElementTypes) {
  return LLVMStructType((LLVMTypeRef *) ElementTypes,
                        Wosize_val(ElementTypes), 1);
}

/* lltype -> lltype array */
CAMLprim value llvm_element_types(LLVMTypeRef StructTy) {
  value Tys = alloc(LLVMCountStructElementTypes(StructTy), 0);
  LLVMGetStructElementTypes(StructTy, (LLVMTypeRef *) Tys);
  return Tys;
}

/* lltype -> bool */
CAMLprim value llvm_is_packed(LLVMTypeRef StructTy) {
  return Val_bool(LLVMIsPackedStruct(StructTy));
}

/*--... Operations on array, pointer, and vector types .....................--*/

/* lltype -> int -> lltype */
CAMLprim LLVMTypeRef llvm_array_type(LLVMTypeRef ElementTy, value Count) {
  return LLVMArrayType(ElementTy, Int_val(Count));
}

/* lltype -> lltype */
CAMLprim LLVMTypeRef llvm_pointer_type(LLVMTypeRef ElementTy) {
  return LLVMPointerType(ElementTy, 0);
}

/* lltype -> int -> lltype */
CAMLprim LLVMTypeRef llvm_qualified_pointer_type(LLVMTypeRef ElementTy,
                                                 value AddressSpace) {
  return LLVMPointerType(ElementTy, Int_val(AddressSpace));
}

/* lltype -> int -> lltype */
CAMLprim LLVMTypeRef llvm_vector_type(LLVMTypeRef ElementTy, value Count) {
  return LLVMVectorType(ElementTy, Int_val(Count));
}

/* lltype -> int */
CAMLprim value llvm_array_length(LLVMTypeRef ArrayTy) {
  return Val_int(LLVMGetArrayLength(ArrayTy));
}

/* lltype -> int */
CAMLprim value llvm_address_space(LLVMTypeRef PtrTy) {
  return Val_int(LLVMGetPointerAddressSpace(PtrTy));
}

/* lltype -> int */
CAMLprim value llvm_vector_size(LLVMTypeRef VectorTy) {
  return Val_int(LLVMGetVectorSize(VectorTy));
}

/*--... Operations on other types ..........................................--*/

/* unit -> lltype */
CAMLprim LLVMTypeRef llvm_void_type (value Unit) { return LLVMVoidType();  }
CAMLprim LLVMTypeRef llvm_label_type(value Unit) { return LLVMLabelType(); }

/* unit -> lltype */
CAMLprim LLVMTypeRef llvm_opaque_type(value Unit) {
  return LLVMOpaqueType();
}

/*--... Operations on type handles .........................................--*/

#define Typehandle_val(v)  (*(LLVMTypeHandleRef *)(Data_custom_val(v)))

static void llvm_finalize_handle(value TH) {
  LLVMDisposeTypeHandle(Typehandle_val(TH));
}

static struct custom_operations typehandle_ops = {
  (char *) "LLVMTypeHandle",
  llvm_finalize_handle,
  custom_compare_default,
  custom_hash_default,
  custom_serialize_default,
  custom_deserialize_default
};

CAMLprim value llvm_handle_to_type(LLVMTypeRef PATy) {
  value TH = alloc_custom(&typehandle_ops, sizeof(LLVMBuilderRef), 0, 1);
  Typehandle_val(TH) = LLVMCreateTypeHandle(PATy);
  return TH;
}

CAMLprim LLVMTypeRef llvm_type_of_handle(value TH) {
  return LLVMResolveTypeHandle(Typehandle_val(TH));
}

CAMLprim value llvm_refine_type(LLVMTypeRef AbstractTy, LLVMTypeRef ConcreteTy){
  LLVMRefineAbstractType(AbstractTy, ConcreteTy);
  return Val_unit;
}


/*===-- VALUES ------------------------------------------------------------===*/

/* llvalue -> lltype */
CAMLprim LLVMTypeRef llvm_type_of(LLVMValueRef Val) {
  return LLVMTypeOf(Val);
}

/* llvalue -> string */
CAMLprim value llvm_value_name(LLVMValueRef Val) {
  return copy_string(LLVMGetValueName(Val));
}

/* string -> llvalue -> unit */
CAMLprim value llvm_set_value_name(value Name, LLVMValueRef Val) {
  LLVMSetValueName(Val, String_val(Name));
  return Val_unit;
}

/* llvalue -> unit */
CAMLprim value llvm_dump_value(LLVMValueRef Val) {
  LLVMDumpValue(Val);
  return Val_unit;
}

/*--... Operations on constants of (mostly) any type .......................--*/

/* llvalue -> bool */
CAMLprim value llvm_is_constant(LLVMValueRef Val) {
  return Val_bool(LLVMIsConstant(Val));
}

/* llvalue -> bool */
CAMLprim value llvm_is_null(LLVMValueRef Val) {
  return Val_bool(LLVMIsNull(Val));
}

/* llvalue -> bool */
CAMLprim value llvm_is_undef(LLVMValueRef Val) {
  return Val_bool(LLVMIsUndef(Val));
}

/*--... Operations on scalar constants .....................................--*/

/* lltype -> int -> llvalue */
CAMLprim LLVMValueRef llvm_const_int(LLVMTypeRef IntTy, value N) {
  return LLVMConstInt(IntTy, (long long) Int_val(N), 1);
}

/* lltype -> Int64.t -> bool -> llvalue */
CAMLprim LLVMValueRef llvm_const_of_int64(LLVMTypeRef IntTy, value N,
                                          value SExt) {
  return LLVMConstInt(IntTy, Int64_val(N), Bool_val(SExt));
}

/* lltype -> float -> llvalue */
CAMLprim LLVMValueRef llvm_const_float(LLVMTypeRef RealTy, value N) {
  return LLVMConstReal(RealTy, Double_val(N));
}

/*--... Operations on composite constants ..................................--*/

/* string -> llvalue */
CAMLprim LLVMValueRef llvm_const_string(value Str, value NullTerminate) {
  return LLVMConstString(String_val(Str), string_length(Str), 1);
}

/* string -> llvalue */
CAMLprim LLVMValueRef llvm_const_stringz(value Str, value NullTerminate) {
  return LLVMConstString(String_val(Str), string_length(Str), 0);
}

/* lltype -> llvalue array -> llvalue */
CAMLprim LLVMValueRef llvm_const_array(LLVMTypeRef ElementTy,
                                               value ElementVals) {
  return LLVMConstArray(ElementTy, (LLVMValueRef*) Op_val(ElementVals),
                        Wosize_val(ElementVals));
}

/* llvalue array -> llvalue */
CAMLprim LLVMValueRef llvm_const_struct(value ElementVals) {
  return LLVMConstStruct((LLVMValueRef *) Op_val(ElementVals),
                         Wosize_val(ElementVals), 0);
}

/* llvalue array -> llvalue */
CAMLprim LLVMValueRef llvm_const_packed_struct(value ElementVals) {
  return LLVMConstStruct((LLVMValueRef *) Op_val(ElementVals),
                         Wosize_val(ElementVals), 1);
}

/* llvalue array -> llvalue */
CAMLprim LLVMValueRef llvm_const_vector(value ElementVals) {
  return LLVMConstVector((LLVMValueRef*) Op_val(ElementVals),
                         Wosize_val(ElementVals));
}

/*--... Constant expressions ...............................................--*/

/* Icmp.t -> llvalue -> llvalue -> llvalue */
CAMLprim LLVMValueRef llvm_const_icmp(value Pred,
                                      LLVMValueRef LHSConstant,
                                      LLVMValueRef RHSConstant) {
  return LLVMConstICmp(Int_val(Pred) + LLVMIntEQ, LHSConstant, RHSConstant);
}

/* Fcmp.t -> llvalue -> llvalue -> llvalue */
CAMLprim LLVMValueRef llvm_const_fcmp(value Pred,
                                      LLVMValueRef LHSConstant,
                                      LLVMValueRef RHSConstant) {
  return LLVMConstFCmp(Int_val(Pred), LHSConstant, RHSConstant);
}

/* llvalue -> llvalue array -> llvalue */
CAMLprim LLVMValueRef llvm_const_gep(LLVMValueRef ConstantVal, value Indices) {
  return LLVMConstGEP(ConstantVal, (LLVMValueRef*) Op_val(Indices),
                      Wosize_val(Indices));
}

/*--... Operations on global variables, functions, and aliases (globals) ...--*/

/* llvalue -> bool */
CAMLprim value llvm_is_declaration(LLVMValueRef Global) {
  return Val_bool(LLVMIsDeclaration(Global));
}

/* llvalue -> Linkage.t */
CAMLprim value llvm_linkage(LLVMValueRef Global) {
  return Val_int(LLVMGetLinkage(Global));
}

/* Linkage.t -> llvalue -> unit */
CAMLprim value llvm_set_linkage(value Linkage, LLVMValueRef Global) {
  LLVMSetLinkage(Global, Int_val(Linkage));
  return Val_unit;
}

/* llvalue -> string */
CAMLprim value llvm_section(LLVMValueRef Global) {
  return copy_string(LLVMGetSection(Global));
}

/* string -> llvalue -> unit */
CAMLprim value llvm_set_section(value Section, LLVMValueRef Global) {
  LLVMSetSection(Global, String_val(Section));
  return Val_unit;
}

/* llvalue -> Visibility.t */
CAMLprim value llvm_visibility(LLVMValueRef Global) {
  return Val_int(LLVMGetVisibility(Global));
}

/* Visibility.t -> llvalue -> unit */
CAMLprim value llvm_set_visibility(value Viz, LLVMValueRef Global) {
  LLVMSetVisibility(Global, Int_val(Viz));
  return Val_unit;
}

/* llvalue -> int */
CAMLprim value llvm_alignment(LLVMValueRef Global) {
  return Val_int(LLVMGetAlignment(Global));
}

/* int -> llvalue -> unit */
CAMLprim value llvm_set_alignment(value Bytes, LLVMValueRef Global) {
  LLVMSetAlignment(Global, Int_val(Bytes));
  return Val_unit;
}

/*--... Operations on global variables .....................................--*/

/* lltype -> string -> llmodule -> llvalue */
CAMLprim LLVMValueRef llvm_declare_global(LLVMTypeRef Ty, value Name,
                                          LLVMModuleRef M) {
  LLVMValueRef GlobalVar;
  if ((GlobalVar = LLVMGetNamedGlobal(M, String_val(Name)))) {
    if (LLVMGetElementType(LLVMTypeOf(GlobalVar)) != Ty)
      return LLVMConstBitCast(GlobalVar, LLVMPointerType(Ty, 0));
    return GlobalVar;
  }
  return LLVMAddGlobal(M, Ty, String_val(Name));
}

/* string -> llmodule -> llvalue option */
CAMLprim value llvm_lookup_global(value Name, LLVMModuleRef M) {
  CAMLparam1(Name);
  LLVMValueRef GlobalVar;
  if ((GlobalVar = LLVMGetNamedGlobal(M, String_val(Name)))) {
    value Option = alloc(1, 0);
    Field(Option, 0) = (value) GlobalVar;
    CAMLreturn(Option);
  }
  CAMLreturn(Val_int(0));
}

/* string -> llvalue -> llmodule -> llvalue */
CAMLprim LLVMValueRef llvm_define_global(value Name, LLVMValueRef Initializer,
                                         LLVMModuleRef M) {
  LLVMValueRef GlobalVar = LLVMAddGlobal(M, LLVMTypeOf(Initializer),
                                         String_val(Name));
  LLVMSetInitializer(GlobalVar, Initializer);
  return GlobalVar;
}

/* llvalue -> unit */
CAMLprim value llvm_delete_global(LLVMValueRef GlobalVar) {
  LLVMDeleteGlobal(GlobalVar);
  return Val_unit;
}

/* llvalue -> llvalue -> unit */
CAMLprim value llvm_set_initializer(LLVMValueRef ConstantVal,
                                    LLVMValueRef GlobalVar) {
  LLVMSetInitializer(GlobalVar, ConstantVal);
  return Val_unit;
}

/* llvalue -> unit */
CAMLprim value llvm_remove_initializer(LLVMValueRef GlobalVar) {
  LLVMSetInitializer(GlobalVar, NULL);
  return Val_unit;
}

/* llvalue -> bool */
CAMLprim value llvm_is_thread_local(LLVMValueRef GlobalVar) {
  return Val_bool(LLVMIsThreadLocal(GlobalVar));
}

/* bool -> llvalue -> unit */
CAMLprim value llvm_set_thread_local(value IsThreadLocal,
                                     LLVMValueRef GlobalVar) {
  LLVMSetThreadLocal(GlobalVar, Bool_val(IsThreadLocal));
  return Val_unit;
}

/* llvalue -> bool */
CAMLprim value llvm_is_global_constant(LLVMValueRef GlobalVar) {
  return Val_bool(LLVMIsGlobalConstant(GlobalVar));
}

/* bool -> llvalue -> unit */
CAMLprim value llvm_set_global_constant(value Flag, LLVMValueRef GlobalVar) {
  LLVMSetGlobalConstant(GlobalVar, Bool_val(Flag));
  return Val_unit;
}

/*--... Operations on functions ............................................--*/

/* string -> lltype -> llmodule -> llvalue */
CAMLprim LLVMValueRef llvm_declare_function(value Name, LLVMTypeRef Ty,
                                            LLVMModuleRef M) {
  LLVMValueRef Fn;
  if ((Fn = LLVMGetNamedFunction(M, String_val(Name)))) {
    if (LLVMGetElementType(LLVMTypeOf(Fn)) != Ty)
      return LLVMConstBitCast(Fn, LLVMPointerType(Ty, 0));
    return Fn;
  }
  return LLVMAddFunction(M, String_val(Name), Ty);
}

/* string -> llmodule -> llvalue option */
CAMLprim value llvm_lookup_function(value Name, LLVMModuleRef M) {
  CAMLparam1(Name);
  LLVMValueRef Fn;
  if ((Fn = LLVMGetNamedFunction(M, String_val(Name)))) {
    value Option = alloc(1, 0);
    Field(Option, 0) = (value) Fn;
    CAMLreturn(Option);
  }
  CAMLreturn(Val_int(0));
}

/* string -> lltype -> llmodule -> llvalue */
CAMLprim LLVMValueRef llvm_define_function(value Name, LLVMTypeRef Ty,
                                           LLVMModuleRef M) {
  LLVMValueRef Fn = LLVMAddFunction(M, String_val(Name), Ty);
  LLVMAppendBasicBlock(Fn, "entry");
  return Fn;
}

/* llvalue -> unit */
CAMLprim value llvm_delete_function(LLVMValueRef Fn) {
  LLVMDeleteFunction(Fn);
  return Val_unit;
}

/* llvalue -> int -> llvalue */
CAMLprim LLVMValueRef llvm_param(LLVMValueRef Fn, value Index) {
  return LLVMGetParam(Fn, Int_val(Index));
}

/* llvalue -> int -> llvalue */
CAMLprim value llvm_params(LLVMValueRef Fn, value Index) {
  value Params = alloc(LLVMCountParams(Fn), 0);
  LLVMGetParams(Fn, (LLVMValueRef *) Op_val(Params));
  return Params;
}

/* llvalue -> bool */
CAMLprim value llvm_is_intrinsic(LLVMValueRef Fn) {
  return Val_bool(LLVMGetIntrinsicID(Fn));
}

/* llvalue -> int */
CAMLprim value llvm_function_call_conv(LLVMValueRef Fn) {
  return Val_int(LLVMGetFunctionCallConv(Fn));
}

/* int -> llvalue -> unit */
CAMLprim value llvm_set_function_call_conv(value Id, LLVMValueRef Fn) {
  LLVMSetFunctionCallConv(Fn, Int_val(Id));
  return Val_unit;
}

/* llvalue -> string option */
CAMLprim value llvm_collector(LLVMValueRef Fn) {
  const char *Collector;
  CAMLparam0();
  CAMLlocal2(Name, Option);
  
  if ((Collector = LLVMGetCollector(Fn))) {
    Name = copy_string(Collector);
    
    Option = alloc(1, 0);
    Field(Option, 0) = Name;
    CAMLreturn(Option);
  } else {
    CAMLreturn(Val_int(0));
  }
}

/* string option -> llvalue -> unit */
CAMLprim value llvm_set_collector(value GC, LLVMValueRef Fn) {
  LLVMSetCollector(Fn, GC == Val_int(0)? 0 : String_val(Field(GC, 0)));
  return Val_unit;
}

/*--... Operations on basic blocks .........................................--*/

/* llvalue -> llbasicblock array */
CAMLprim value llvm_basic_blocks(LLVMValueRef Fn) {
  value MLArray = alloc(LLVMCountBasicBlocks(Fn), 0);
  LLVMGetBasicBlocks(Fn, (LLVMBasicBlockRef *) Op_val(MLArray));
  return MLArray;
}

/* llbasicblock -> unit */
CAMLprim value llvm_delete_block(LLVMBasicBlockRef BB) {
  LLVMDeleteBasicBlock(BB);
  return Val_unit;
}

/* string -> llvalue -> llbasicblock */
CAMLprim LLVMBasicBlockRef llvm_append_block(value Name, LLVMValueRef Fn) {
  return LLVMAppendBasicBlock(Fn, String_val(Name));
}

/* string -> llbasicblock -> llbasicblock */
CAMLprim LLVMBasicBlockRef llvm_insert_block(value Name, LLVMBasicBlockRef BB) {
  return LLVMInsertBasicBlock(BB, String_val(Name));
}

/* llvalue -> bool */
CAMLprim value llvm_value_is_block(LLVMValueRef Val) {
  return Val_bool(LLVMValueIsBasicBlock(Val));
}

/*--... Operations on call sites ...........................................--*/

/* llvalue -> int */
CAMLprim value llvm_instruction_call_conv(LLVMValueRef Inst) {
  return Val_int(LLVMGetInstructionCallConv(Inst));
}

/* int -> llvalue -> unit */
CAMLprim value llvm_set_instruction_call_conv(value CC, LLVMValueRef Inst) {
  LLVMSetInstructionCallConv(Inst, Int_val(CC));
  return Val_unit;
}

/*--... Operations on phi nodes ............................................--*/

/* (llvalue * llbasicblock) -> llvalue -> unit */
CAMLprim value llvm_add_incoming(value Incoming, LLVMValueRef PhiNode) {
  LLVMAddIncoming(PhiNode,
                  (LLVMValueRef*) &Field(Incoming, 0),
                  (LLVMBasicBlockRef*) &Field(Incoming, 1),
                  1);
  return Val_unit;
}

/* llvalue -> (llvalue * llbasicblock) list */
CAMLprim value llvm_incoming(LLVMValueRef PhiNode) {
  unsigned I;
  CAMLparam0();
  CAMLlocal3(Hd, Tl, Tmp);
  
  /* Build a tuple list of them. */
  Tl = Val_int(0);
  for (I = LLVMCountIncoming(PhiNode); I != 0; ) {
    Hd = alloc(2, 0);
    Store_field(Hd, 0, (value) LLVMGetIncomingValue(PhiNode, --I));
    Store_field(Hd, 1, (value) LLVMGetIncomingBlock(PhiNode, I));
    
    Tmp = alloc(2, 0);
    Store_field(Tmp, 0, Hd);
    Store_field(Tmp, 1, Tl);
    Tl = Tmp;
  }
  
  CAMLreturn(Tl);
}


/*===-- Instruction builders ----------------------------------------------===*/

#define Builder_val(v)  (*(LLVMBuilderRef *)(Data_custom_val(v)))

static void llvm_finalize_builder(value B) {
  LLVMDisposeBuilder(Builder_val(B));
}

static struct custom_operations builder_ops = {
  (char *) "LLVMBuilder",
  llvm_finalize_builder,
  custom_compare_default,
  custom_hash_default,
  custom_serialize_default,
  custom_deserialize_default
};

static value alloc_builder(LLVMBuilderRef B) {
  value V = alloc_custom(&builder_ops, sizeof(LLVMBuilderRef), 0, 1);
  Builder_val(V) = B;
  return V;
}

/* unit-> llbuilder */
CAMLprim value llvm_builder(value Unit) {
  return alloc_builder(LLVMCreateBuilder());
}

/* llvalue -> llbuilder */
CAMLprim value llvm_builder_before(LLVMValueRef Inst) {
  LLVMBuilderRef B = LLVMCreateBuilder();
  LLVMPositionBuilderBefore(B, Inst);
  return alloc_builder(B);
}

/* llbasicblock -> llbuilder */
CAMLprim value llvm_builder_at_end(LLVMBasicBlockRef BB) {
  LLVMBuilderRef B = LLVMCreateBuilder();
  LLVMPositionBuilderAtEnd(B, BB);
  return alloc_builder(B);
}

/* llvalue -> llbuilder -> unit */
CAMLprim value llvm_position_before(LLVMValueRef Inst, value B) {
  LLVMPositionBuilderBefore(Builder_val(B), Inst);
  return Val_unit;
}

/* llbasicblock -> llbuilder -> unit */
CAMLprim value llvm_position_at_end(LLVMBasicBlockRef BB, value B) {
  LLVMPositionBuilderAtEnd(Builder_val(B), BB);
  return Val_unit;
}

/*--... Terminators ........................................................--*/

/* llbuilder -> llvalue */
CAMLprim LLVMValueRef llvm_build_ret_void(value B) {
  return LLVMBuildRetVoid(Builder_val(B));
}

/* llvalue -> llbuilder -> llvalue */
CAMLprim LLVMValueRef llvm_build_ret(LLVMValueRef Val, value B) {
  return LLVMBuildRet(Builder_val(B), Val);
}

/* llbasicblock -> llbuilder -> llvalue */
CAMLprim LLVMValueRef llvm_build_br(LLVMBasicBlockRef BB, value B) {
  return LLVMBuildBr(Builder_val(B), BB);
}

/* llvalue -> llbasicblock -> llbasicblock -> llbuilder -> llvalue */
CAMLprim LLVMValueRef llvm_build_cond_br(LLVMValueRef If,
                                         LLVMBasicBlockRef Then,
                                         LLVMBasicBlockRef Else,
                                         value B) {
  return LLVMBuildCondBr(Builder_val(B), If, Then, Else);
}

/* llvalue -> llbasicblock -> int -> llbuilder -> llvalue */
CAMLprim LLVMValueRef llvm_build_switch(LLVMValueRef Of,
                                        LLVMBasicBlockRef Else,
                                        value EstimatedCount,
                                        value B) {
  return LLVMBuildSwitch(Builder_val(B), Of, Else, Int_val(EstimatedCount));
}

/* llvalue -> llvalue array -> llbasicblock -> llbasicblock -> string ->
   llbuilder -> llvalue */
CAMLprim LLVMValueRef llvm_build_invoke_nat(LLVMValueRef Fn, value Args,
                                            LLVMBasicBlockRef Then,
                                            LLVMBasicBlockRef Catch,
                                            value Name, value B) {
  return LLVMBuildInvoke(Builder_val(B), Fn, (LLVMValueRef *) Op_val(Args),
                         Wosize_val(Args), Then, Catch, String_val(Name));
}

/* llvalue -> llvalue array -> llbasicblock -> llbasicblock -> string ->
   llbuilder -> llvalue */
CAMLprim LLVMValueRef llvm_build_invoke_bc(value Args[], int NumArgs) {
  return llvm_build_invoke_nat((LLVMValueRef) Args[0], Args[1],
                               (LLVMBasicBlockRef) Args[2],
                               (LLVMBasicBlockRef) Args[3],
                               Args[4], Args[5]);
}

/* llbuilder -> llvalue */
CAMLprim LLVMValueRef llvm_build_unwind(value B) {
  return LLVMBuildUnwind(Builder_val(B));
}

/* llbuilder -> llvalue */
CAMLprim LLVMValueRef llvm_build_unreachable(value B) {
  return LLVMBuildUnreachable(Builder_val(B));
}

/*--... Arithmetic .........................................................--*/

/* llvalue -> llvalue -> string -> llbuilder -> llvalue */
CAMLprim LLVMValueRef llvm_build_add(LLVMValueRef LHS, LLVMValueRef RHS,
                                     value Name, value B) {
  return LLVMBuildAdd(Builder_val(B), LHS, RHS, String_val(Name));
}

/* llvalue -> llvalue -> string -> llbuilder -> llvalue */
CAMLprim LLVMValueRef llvm_build_sub(LLVMValueRef LHS, LLVMValueRef RHS,
                                     value Name, value B) {
  return LLVMBuildSub(Builder_val(B), LHS, RHS, String_val(Name));
}

/* llvalue -> llvalue -> string -> llbuilder -> llvalue */
CAMLprim LLVMValueRef llvm_build_mul(LLVMValueRef LHS, LLVMValueRef RHS,
                                     value Name, value B) {
  return LLVMBuildMul(Builder_val(B), LHS, RHS, String_val(Name));
}

/* llvalue -> llvalue -> string -> llbuilder -> llvalue */
CAMLprim LLVMValueRef llvm_build_udiv(LLVMValueRef LHS, LLVMValueRef RHS,
                                      value Name, value B) {
  return LLVMBuildUDiv(Builder_val(B), LHS, RHS, String_val(Name));
}

/* llvalue -> llvalue -> string -> llbuilder -> llvalue */
CAMLprim LLVMValueRef llvm_build_sdiv(LLVMValueRef LHS, LLVMValueRef RHS,
                                      value Name, value B) {
  return LLVMBuildSDiv(Builder_val(B), LHS, RHS, String_val(Name));
}

/* llvalue -> llvalue -> string -> llbuilder -> llvalue */
CAMLprim LLVMValueRef llvm_build_fdiv(LLVMValueRef LHS, LLVMValueRef RHS,
                                      value Name, value B) {
  return LLVMBuildFDiv(Builder_val(B), LHS, RHS, String_val(Name));
}

/* llvalue -> llvalue -> string -> llbuilder -> llvalue */
CAMLprim LLVMValueRef llvm_build_urem(LLVMValueRef LHS, LLVMValueRef RHS,
                                      value Name, value B) {
  return LLVMBuildURem(Builder_val(B), LHS, RHS, String_val(Name));
}

/* llvalue -> llvalue -> string -> llbuilder -> llvalue */
CAMLprim LLVMValueRef llvm_build_srem(LLVMValueRef LHS, LLVMValueRef RHS,
                                      value Name, value B) {
  return LLVMBuildSRem(Builder_val(B), LHS, RHS, String_val(Name));
}

/* llvalue -> llvalue -> string -> llbuilder -> llvalue */
CAMLprim LLVMValueRef llvm_build_frem(LLVMValueRef LHS, LLVMValueRef RHS,
                                      value Name, value B) {
  return LLVMBuildFRem(Builder_val(B), LHS, RHS, String_val(Name));
}

/* llvalue -> llvalue -> string -> llbuilder -> llvalue */
CAMLprim LLVMValueRef llvm_build_shl(LLVMValueRef LHS, LLVMValueRef RHS,
                                     value Name, value B) {
  return LLVMBuildShl(Builder_val(B), LHS, RHS, String_val(Name));
}

/* llvalue -> llvalue -> string -> llbuilder -> llvalue */
CAMLprim LLVMValueRef llvm_build_lshr(LLVMValueRef LHS, LLVMValueRef RHS,
                                      value Name, value B) {
  return LLVMBuildLShr(Builder_val(B), LHS, RHS, String_val(Name));
}

/* llvalue -> llvalue -> string -> llbuilder -> llvalue */
CAMLprim LLVMValueRef llvm_build_ashr(LLVMValueRef LHS, LLVMValueRef RHS,
                                      value Name, value B) {
  return LLVMBuildAShr(Builder_val(B), LHS, RHS, String_val(Name));
}

/* llvalue -> llvalue -> string -> llbuilder -> llvalue */
CAMLprim LLVMValueRef llvm_build_and(LLVMValueRef LHS, LLVMValueRef RHS,
                                     value Name, value B) {
  return LLVMBuildAnd(Builder_val(B), LHS, RHS, String_val(Name));
}

/* llvalue -> llvalue -> string -> llbuilder -> llvalue */
CAMLprim LLVMValueRef llvm_build_or(LLVMValueRef LHS, LLVMValueRef RHS,
                                    value Name, value B) {
  return LLVMBuildOr(Builder_val(B), LHS, RHS, String_val(Name));
}

/* llvalue -> llvalue -> string -> llbuilder -> llvalue */
CAMLprim LLVMValueRef llvm_build_xor(LLVMValueRef LHS, LLVMValueRef RHS,
                                     value Name, value B) {
  return LLVMBuildXor(Builder_val(B), LHS, RHS, String_val(Name));
}

/* llvalue -> string -> llbuilder -> llvalue */
CAMLprim LLVMValueRef llvm_build_neg(LLVMValueRef X,
                                     value Name, value B) {
  return LLVMBuildNeg(Builder_val(B), X, String_val(Name));
}

/* llvalue -> string -> llbuilder -> llvalue */
CAMLprim LLVMValueRef llvm_build_not(LLVMValueRef X,
                                     value Name, value B) {
  return LLVMBuildNot(Builder_val(B), X, String_val(Name));
}

/*--... Memory .............................................................--*/

/* lltype -> string -> llbuilder -> llvalue */
CAMLprim LLVMValueRef llvm_build_malloc(LLVMTypeRef Ty,
                                        value Name, value B) {
  return LLVMBuildMalloc(Builder_val(B), Ty, String_val(Name));
}

/* lltype -> llvalue -> string -> llbuilder -> llvalue */
CAMLprim LLVMValueRef llvm_build_array_malloc(LLVMTypeRef Ty, LLVMValueRef Size,
                                              value Name, value B) {
  return LLVMBuildArrayMalloc(Builder_val(B), Ty, Size, String_val(Name));
}

/* lltype -> string -> llbuilder -> llvalue */
CAMLprim LLVMValueRef llvm_build_alloca(LLVMTypeRef Ty,
                                        value Name, value B) {
  return LLVMBuildAlloca(Builder_val(B), Ty, String_val(Name));
}

/* lltype -> llvalue -> string -> llbuilder -> llvalue */
CAMLprim LLVMValueRef llvm_build_array_alloca(LLVMTypeRef Ty, LLVMValueRef Size,
                                              value Name, value B) {
  return LLVMBuildArrayAlloca(Builder_val(B), Ty, Size, String_val(Name));
}

/* llvalue -> llbuilder -> llvalue */
CAMLprim LLVMValueRef llvm_build_free(LLVMValueRef Pointer, value B) {
  return LLVMBuildFree(Builder_val(B), Pointer);
}

/* llvalue -> string -> llbuilder -> llvalue */
CAMLprim LLVMValueRef llvm_build_load(LLVMValueRef Pointer,
                                      value Name, value B) {
  return LLVMBuildLoad(Builder_val(B), Pointer, String_val(Name));
}

/* llvalue -> llvalue -> llbuilder -> llvalue */
CAMLprim LLVMValueRef llvm_build_store(LLVMValueRef Value, LLVMValueRef Pointer,
                                       value B) {
  return LLVMBuildStore(Builder_val(B), Value, Pointer);
}

/* llvalue -> llvalue array -> string -> llbuilder -> llvalue */
CAMLprim LLVMValueRef llvm_build_gep(LLVMValueRef Pointer, value Indices,
                                     value Name, value B) {
  return LLVMBuildGEP(Builder_val(B), Pointer,
                      (LLVMValueRef *) Op_val(Indices), Wosize_val(Indices),
                      String_val(Name));
}

/*--... Casts ..............................................................--*/

/* llvalue -> lltype -> string -> llbuilder -> llvalue */
CAMLprim LLVMValueRef llvm_build_trunc(LLVMValueRef X, LLVMTypeRef Ty,
                                       value Name, value B) {
  return LLVMBuildTrunc(Builder_val(B), X, Ty, String_val(Name));
}

/* llvalue -> lltype -> string -> llbuilder -> llvalue */
CAMLprim LLVMValueRef llvm_build_zext(LLVMValueRef X, LLVMTypeRef Ty,
                                      value Name, value B) {
  return LLVMBuildZExt(Builder_val(B), X, Ty, String_val(Name));
}

/* llvalue -> lltype -> string -> llbuilder -> llvalue */
CAMLprim LLVMValueRef llvm_build_sext(LLVMValueRef X, LLVMTypeRef Ty,
                                      value Name, value B) {
  return LLVMBuildSExt(Builder_val(B), X, Ty, String_val(Name));
}

/* llvalue -> lltype -> string -> llbuilder -> llvalue */
CAMLprim LLVMValueRef llvm_build_fptoui(LLVMValueRef X, LLVMTypeRef Ty,
                                        value Name, value B) {
  return LLVMBuildFPToUI(Builder_val(B), X, Ty, String_val(Name));
}

/* llvalue -> lltype -> string -> llbuilder -> llvalue */
CAMLprim LLVMValueRef llvm_build_fptosi(LLVMValueRef X, LLVMTypeRef Ty,
                                        value Name, value B) {
  return LLVMBuildFPToSI(Builder_val(B), X, Ty, String_val(Name));
}

/* llvalue -> lltype -> string -> llbuilder -> llvalue */
CAMLprim LLVMValueRef llvm_build_uitofp(LLVMValueRef X, LLVMTypeRef Ty,
                                        value Name, value B) {
  return LLVMBuildUIToFP(Builder_val(B), X, Ty, String_val(Name));
}

/* llvalue -> lltype -> string -> llbuilder -> llvalue */
CAMLprim LLVMValueRef llvm_build_sitofp(LLVMValueRef X, LLVMTypeRef Ty,
                                        value Name, value B) {
  return LLVMBuildSIToFP(Builder_val(B), X, Ty, String_val(Name));
}

/* llvalue -> lltype -> string -> llbuilder -> llvalue */
CAMLprim LLVMValueRef llvm_build_fptrunc(LLVMValueRef X, LLVMTypeRef Ty,
                                         value Name, value B) {
  return LLVMBuildFPTrunc(Builder_val(B), X, Ty, String_val(Name));
}

/* llvalue -> lltype -> string -> llbuilder -> llvalue */
CAMLprim LLVMValueRef llvm_build_fpext(LLVMValueRef X, LLVMTypeRef Ty,
                                       value Name, value B) {
  return LLVMBuildFPExt(Builder_val(B), X, Ty, String_val(Name));
}

/* llvalue -> lltype -> string -> llbuilder -> llvalue */
CAMLprim LLVMValueRef llvm_build_prttoint(LLVMValueRef X, LLVMTypeRef Ty,
                                          value Name, value B) {
  return LLVMBuildPtrToInt(Builder_val(B), X, Ty, String_val(Name));
}

/* llvalue -> lltype -> string -> llbuilder -> llvalue */
CAMLprim LLVMValueRef llvm_build_inttoptr(LLVMValueRef X, LLVMTypeRef Ty,
                                          value Name, value B) {
  return LLVMBuildIntToPtr(Builder_val(B), X, Ty, String_val(Name));
}

/* llvalue -> lltype -> string -> llbuilder -> llvalue */
CAMLprim LLVMValueRef llvm_build_bitcast(LLVMValueRef X, LLVMTypeRef Ty,
                                         value Name, value B) {
  return LLVMBuildBitCast(Builder_val(B), X, Ty, String_val(Name));
}

/*--... Comparisons ........................................................--*/

/* Icmp.t -> llvalue -> llvalue -> string -> llbuilder -> llvalue */
CAMLprim LLVMValueRef llvm_build_icmp(value Pred,
                                      LLVMValueRef LHS, LLVMValueRef RHS,
                                      value Name, value B) {
  return LLVMBuildICmp(Builder_val(B), Int_val(Pred) + LLVMIntEQ, LHS, RHS,
                       String_val(Name));
}

/* Fcmp.t -> llvalue -> llvalue -> string -> llbuilder -> llvalue */
CAMLprim LLVMValueRef llvm_build_fcmp(value Pred,
                                      LLVMValueRef LHS, LLVMValueRef RHS,
                                      value Name, value B) {
  return LLVMBuildFCmp(Builder_val(B), Int_val(Pred), LHS, RHS,
                       String_val(Name));
}

/*--... Miscellaneous instructions .........................................--*/

/* (llvalue * llbasicblock) list -> string -> llbuilder -> llvalue */
CAMLprim LLVMValueRef llvm_build_phi(value Incoming, value Name, value B) {
  value Hd, Tl;
  LLVMValueRef FirstValue, PhiNode;
  
  assert(Incoming != Val_int(0) && "Empty list passed to Llvm.build_phi!");
  
  Hd = Field(Incoming, 0);
  FirstValue = (LLVMValueRef) Field(Hd, 0);
  PhiNode = LLVMBuildPhi(Builder_val(B), LLVMTypeOf(FirstValue),
                         String_val(Name));

  for (Tl = Incoming; Tl != Val_int(0); Tl = Field(Tl, 1)) {
    value Hd = Field(Tl, 0);
    LLVMAddIncoming(PhiNode, (LLVMValueRef*) &Field(Hd, 0),
                    (LLVMBasicBlockRef*) &Field(Hd, 1), 1);
  }
  
  return PhiNode;
}

/* llvalue -> llvalue array -> string -> llbuilder -> llvalue */
CAMLprim LLVMValueRef llvm_build_call(LLVMValueRef Fn, value Params,
                                      value Name, value B) {
  return LLVMBuildCall(Builder_val(B), Fn, (LLVMValueRef *) Op_val(Params),
                       Wosize_val(Params), String_val(Name));
}

/* llvalue -> llvalue -> llvalue -> string -> llbuilder -> llvalue */
CAMLprim LLVMValueRef llvm_build_select(LLVMValueRef If,
                                        LLVMValueRef Then, LLVMValueRef Else,
                                        value Name, value B) {
  return LLVMBuildSelect(Builder_val(B), If, Then, Else, String_val(Name));
}

/* llvalue -> lltype -> string -> llbuilder -> llvalue */
CAMLprim LLVMValueRef llvm_build_va_arg(LLVMValueRef List, LLVMTypeRef Ty,
                                        value Name, value B) {
  return LLVMBuildVAArg(Builder_val(B), List, Ty, String_val(Name));
}

/* llvalue -> llvalue -> string -> llbuilder -> llvalue */
CAMLprim LLVMValueRef llvm_build_extractelement(LLVMValueRef Vec,
                                                LLVMValueRef Idx,
                                                value Name, value B) {
  return LLVMBuildExtractElement(Builder_val(B), Vec, Idx, String_val(Name));
}

/* llvalue -> llvalue -> llvalue -> string -> llbuilder -> llvalue */
CAMLprim LLVMValueRef llvm_build_insertelement(LLVMValueRef Vec,
                                               LLVMValueRef Element,
                                               LLVMValueRef Idx,
                                               value Name, value B) {
  return LLVMBuildInsertElement(Builder_val(B), Vec, Element, Idx, 
                                String_val(Name));
}

/* llvalue -> llvalue -> llvalue -> string -> llbuilder -> llvalue */
CAMLprim LLVMValueRef llvm_build_shufflevector(LLVMValueRef V1, LLVMValueRef V2,
                                               LLVMValueRef Mask,
                                               value Name, value B) {
  return LLVMBuildShuffleVector(Builder_val(B), V1, V2, Mask, String_val(Name));
}


/*===-- Module Providers --------------------------------------------------===*/

/* llmoduleprovider -> unit */
CAMLprim value llvm_dispose_module_provider(LLVMModuleProviderRef MP) {
  LLVMDisposeModuleProvider(MP);
  return Val_unit;
}


/*===-- Memory buffers ----------------------------------------------------===*/

/* string -> llmemorybuffer
   raises IoError msg on error */
CAMLprim value llvm_memorybuffer_of_file(value Path) {
  CAMLparam1(Path);
  char *Message;
  LLVMMemoryBufferRef MemBuf;
  
  if (LLVMCreateMemoryBufferWithContentsOfFile(String_val(Path),
                                               &MemBuf, &Message))
    llvm_raise(llvm_ioerror_exn, Message);
  
  CAMLreturn((value) MemBuf);
}

/* unit -> llmemorybuffer
   raises IoError msg on error */
CAMLprim LLVMMemoryBufferRef llvm_memorybuffer_of_stdin(value Unit) {
  char *Message;
  LLVMMemoryBufferRef MemBuf;
  
  if (LLVMCreateMemoryBufferWithSTDIN(&MemBuf, &Message))
    llvm_raise(llvm_ioerror_exn, Message);
  
  return MemBuf;
}

/* llmemorybuffer -> unit */
CAMLprim value llvm_memorybuffer_dispose(LLVMMemoryBufferRef MemBuf) {
  LLVMDisposeMemoryBuffer(MemBuf);
  return Val_unit;
}