/*===-- target_ocaml.c - LLVM OCaml Glue ------------------------*- C++ -*-===*\
|*                                                                            *|
|* Part of the LLVM Project, under the Apache License v2.0 with LLVM          *|
|* Exceptions.                                                                *|
|* See https://llvm.org/LICENSE.txt for license information.                  *|
|* SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception                    *|
|*                                                                            *|
|*===----------------------------------------------------------------------===*|
|*                                                                            *|
|* 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 "target_ocaml.h"
#include "caml/alloc.h"
#include "caml/callback.h"
#include "caml/custom.h"
#include "caml/fail.h"
#include "caml/memory.h"
#include "llvm_ocaml.h"
#include "llvm-c/Core.h"
#include "llvm-c/Target.h"
#include "llvm-c/TargetMachine.h"

void llvm_raise(value Prototype, char *Message);
value llvm_string_of_message(char *Message);

/*===---- Data Layout -----------------------------------------------------===*/

#define DataLayout_val(v) (*(LLVMTargetDataRef *)(Data_custom_val(v)))

static void llvm_finalize_data_layout(value DataLayout) {
  LLVMDisposeTargetData(DataLayout_val(DataLayout));
}

static struct custom_operations llvm_data_layout_ops = {
    (char *)"Llvm_target.DataLayout.t",
    llvm_finalize_data_layout,
    custom_compare_default,
    custom_hash_default,
    custom_serialize_default,
    custom_deserialize_default,
    custom_compare_ext_default};

value llvm_alloc_data_layout(LLVMTargetDataRef DataLayout) {
  value V =
      caml_alloc_custom(&llvm_data_layout_ops, sizeof(LLVMTargetDataRef), 0, 1);
  DataLayout_val(V) = DataLayout;
  return V;
}

/* string -> DataLayout.t */
value llvm_datalayout_of_string(value StringRep) {
  return llvm_alloc_data_layout(LLVMCreateTargetData(String_val(StringRep)));
}

/* DataLayout.t -> string */
value llvm_datalayout_as_string(value TD) {
  char *StringRep = LLVMCopyStringRepOfTargetData(DataLayout_val(TD));
  value Copy = caml_copy_string(StringRep);
  LLVMDisposeMessage(StringRep);
  return Copy;
}

/* DataLayout.t -> Endian.t */
value llvm_datalayout_byte_order(value DL) {
  return Val_int(LLVMByteOrder(DataLayout_val(DL)));
}

/* DataLayout.t -> int */
value llvm_datalayout_pointer_size(value DL) {
  return Val_int(LLVMPointerSize(DataLayout_val(DL)));
}

/* Llvm.llcontext -> DataLayout.t -> Llvm.lltype */
value llvm_datalayout_intptr_type(value C, value DL) {
  LLVMTypeRef Type =
      LLVMIntPtrTypeInContext(Context_val(C), DataLayout_val(DL));
  return to_val(Type);
}

/* int -> DataLayout.t -> int */
value llvm_datalayout_qualified_pointer_size(value AS, value DL) {
  return Val_int(LLVMPointerSizeForAS(DataLayout_val(DL), Int_val(AS)));
}

/* Llvm.llcontext -> int -> DataLayout.t -> Llvm.lltype */
value llvm_datalayout_qualified_intptr_type(value C, value AS, value DL) {
  LLVMTypeRef Type = LLVMIntPtrTypeForASInContext(
      Context_val(C), DataLayout_val(DL), Int_val(AS));
  return to_val(Type);
}

/* Llvm.lltype -> DataLayout.t -> Int64.t */
value llvm_datalayout_size_in_bits(value Ty, value DL) {
  return caml_copy_int64(
      LLVMSizeOfTypeInBits(DataLayout_val(DL), Type_val(Ty)));
}

/* Llvm.lltype -> DataLayout.t -> Int64.t */
value llvm_datalayout_store_size(value Ty, value DL) {
  return caml_copy_int64(LLVMStoreSizeOfType(DataLayout_val(DL), Type_val(Ty)));
}

/* Llvm.lltype -> DataLayout.t -> Int64.t */
value llvm_datalayout_abi_size(value Ty, value DL) {
  return caml_copy_int64(LLVMABISizeOfType(DataLayout_val(DL), Type_val(Ty)));
}

/* Llvm.lltype -> DataLayout.t -> int */
value llvm_datalayout_abi_align(value Ty, value DL) {
  return Val_int(LLVMABIAlignmentOfType(DataLayout_val(DL), Type_val(Ty)));
}

/* Llvm.lltype -> DataLayout.t -> int */
value llvm_datalayout_stack_align(value Ty, value DL) {
  return Val_int(
      LLVMCallFrameAlignmentOfType(DataLayout_val(DL), Type_val(Ty)));
}

/* Llvm.lltype -> DataLayout.t -> int */
value llvm_datalayout_preferred_align(value Ty, value DL) {
  return Val_int(
      LLVMPreferredAlignmentOfType(DataLayout_val(DL), Type_val(Ty)));
}

/* Llvm.llvalue -> DataLayout.t -> int */
value llvm_datalayout_preferred_align_of_global(value GlobalVar, value DL) {
  return Val_int(
      LLVMPreferredAlignmentOfGlobal(DataLayout_val(DL), Value_val(GlobalVar)));
}

/* Llvm.lltype -> Int64.t -> DataLayout.t -> int */
value llvm_datalayout_element_at_offset(value Ty, value Offset, value DL) {
  return Val_int(
      LLVMElementAtOffset(DataLayout_val(DL), Type_val(Ty), Int64_val(Offset)));
}

/* Llvm.lltype -> int -> DataLayout.t -> Int64.t */
value llvm_datalayout_offset_of_element(value Ty, value Index, value DL) {
  return caml_copy_int64(
      LLVMOffsetOfElement(DataLayout_val(DL), Type_val(Ty), Int_val(Index)));
}

/*===---- Target ----------------------------------------------------------===*/

#define Target_val(v) ((LLVMTargetRef)from_val(v))

/* unit -> string */
value llvm_target_default_triple(value Unit) {
  char *TripleCStr = LLVMGetDefaultTargetTriple();
  value TripleStr = caml_copy_string(TripleCStr);
  LLVMDisposeMessage(TripleCStr);
  return TripleStr;
}

/* unit -> Target.t option */
value llvm_target_first(value Unit) {
  return ptr_to_option(LLVMGetFirstTarget());
}

/* Target.t -> Target.t option */
value llvm_target_succ(value Target) {
  return ptr_to_option(LLVMGetNextTarget(Target_val(Target)));
}

/* string -> Target.t option */
value llvm_target_by_name(value Name) {
  return ptr_to_option(LLVMGetTargetFromName(String_val(Name)));
}

/* string -> Target.t */
value llvm_target_by_triple(value Triple) {
  LLVMTargetRef T;
  char *Error;

  if (LLVMGetTargetFromTriple(String_val(Triple), &T, &Error))
    llvm_raise(*caml_named_value("Llvm_target.Error"), Error);

  return to_val(T);
}

/* Target.t -> string */
value llvm_target_name(value Target) {
  return caml_copy_string(LLVMGetTargetName(Target_val(Target)));
}

/* Target.t -> string */
value llvm_target_description(value Target) {
  return caml_copy_string(LLVMGetTargetDescription(Target_val(Target)));
}

/* Target.t -> bool */
value llvm_target_has_jit(value Target) {
  return Val_bool(LLVMTargetHasJIT(Target_val(Target)));
}

/* Target.t -> bool */
value llvm_target_has_target_machine(value Target) {
  return Val_bool(LLVMTargetHasTargetMachine(Target_val(Target)));
}

/* Target.t -> bool */
value llvm_target_has_asm_backend(value Target) {
  return Val_bool(LLVMTargetHasAsmBackend(Target_val(Target)));
}

/*===---- Target Machine --------------------------------------------------===*/

static void llvm_finalize_target_machine(value Machine) {
  LLVMDisposeTargetMachine(TargetMachine_val(Machine));
}

static struct custom_operations llvm_target_machine_ops = {
    (char *)"Llvm_target.TargetMachine.t",
    llvm_finalize_target_machine,
    custom_compare_default,
    custom_hash_default,
    custom_serialize_default,
    custom_deserialize_default,
    custom_compare_ext_default};

static value llvm_alloc_targetmachine(LLVMTargetMachineRef Machine) {
  value V = caml_alloc_custom(&llvm_target_machine_ops,
                              sizeof(LLVMTargetMachineRef), 0, 1);
  TargetMachine_val(V) = Machine;
  return V;
}

/* triple:string -> ?cpu:string -> ?features:string
   ?level:CodeGenOptLevel.t -> ?reloc_mode:RelocMode.t
   ?code_model:CodeModel.t -> Target.t -> TargetMachine.t */
value llvm_create_targetmachine_native(value Triple, value CPU, value Features,
                                       value OptLevel, value RelocMode,
                                       value CodeModel, value Target) {
  LLVMTargetMachineRef Machine;
  const char *CPUStr = "", *FeaturesStr = "";
  LLVMCodeGenOptLevel OptLevelEnum = LLVMCodeGenLevelDefault;
  LLVMRelocMode RelocModeEnum = LLVMRelocDefault;
  LLVMCodeModel CodeModelEnum = LLVMCodeModelDefault;

  if (CPU != Val_int(0))
    CPUStr = String_val(Field(CPU, 0));
  if (Features != Val_int(0))
    FeaturesStr = String_val(Field(Features, 0));
  if (OptLevel != Val_int(0))
    OptLevelEnum = Int_val(Field(OptLevel, 0));
  if (RelocMode != Val_int(0))
    RelocModeEnum = Int_val(Field(RelocMode, 0));
  if (CodeModel != Val_int(0))
    CodeModelEnum = Int_val(Field(CodeModel, 0));

  Machine = LLVMCreateTargetMachine(Target_val(Target), String_val(Triple),
                                    CPUStr, FeaturesStr, OptLevelEnum,
                                    RelocModeEnum, CodeModelEnum);

  return llvm_alloc_targetmachine(Machine);
}

value llvm_create_targetmachine_bytecode(value *argv, int argn) {
  return llvm_create_targetmachine_native(argv[0], argv[1], argv[2], argv[3],
                                          argv[4], argv[5], argv[6]);
}

/* TargetMachine.t -> Target.t */
value llvm_targetmachine_target(value Machine) {
  return to_val(LLVMGetTargetMachineTarget(TargetMachine_val(Machine)));
}

/* TargetMachine.t -> string */
value llvm_targetmachine_triple(value Machine) {
  return llvm_string_of_message(
      LLVMGetTargetMachineTriple(TargetMachine_val(Machine)));
}

/* TargetMachine.t -> string */
value llvm_targetmachine_cpu(value Machine) {
  return llvm_string_of_message(
      LLVMGetTargetMachineCPU(TargetMachine_val(Machine)));
}

/* TargetMachine.t -> string */
value llvm_targetmachine_features(value Machine) {
  return llvm_string_of_message(
      LLVMGetTargetMachineFeatureString(TargetMachine_val(Machine)));
}

/* TargetMachine.t -> DataLayout.t */
value llvm_targetmachine_data_layout(value Machine) {
  return llvm_alloc_data_layout(
      LLVMCreateTargetDataLayout(TargetMachine_val(Machine)));
}

/* bool -> TargetMachine.t -> unit */
value llvm_targetmachine_set_verbose_asm(value Verb, value Machine) {
  LLVMSetTargetMachineAsmVerbosity(TargetMachine_val(Machine), Bool_val(Verb));
  return Val_unit;
}

/* bool -> TargetMachine.t -> unit */
value llvm_targetmachine_set_fast_isel(value Enable, value Machine) {
  LLVMSetTargetMachineFastISel(TargetMachine_val(Machine), Bool_val(Enable));
  return Val_unit;
}

/* bool -> TargetMachine.t -> unit */
value llvm_targetmachine_set_global_isel(value Enable, value Machine) {
  LLVMSetTargetMachineGlobalISel(TargetMachine_val(Machine), Bool_val(Enable));
  return Val_unit;
}

/* ?mode:GlobalISelAbortMode.t -> TargetMachine.t -> unit */
value llvm_targetmachine_set_global_isel_abort(value Mode, value Machine) {
  LLVMGlobalISelAbortMode AbortModeEnum = LLVMGlobalISelAbortEnable;
  if (Mode != Val_int(0))
    AbortModeEnum = Int_val(Field(Mode, 0));
  LLVMSetTargetMachineGlobalISelAbort(TargetMachine_val(Machine),
                                      AbortModeEnum);
  return Val_unit;
}

/* bool -> TargetMachine.t -> unit */
value llvm_targetmachine_set_machine_outliner(value Enable, value Machine) {
  LLVMSetTargetMachineMachineOutliner(TargetMachine_val(Machine),
                                      Bool_val(Enable));
  return Val_unit;
}

/* Llvm.llmodule -> CodeGenFileType.t -> string -> TargetMachine.t -> unit */
value llvm_targetmachine_emit_to_file(value Module, value FileType,
                                      value FileName, value Machine) {
  char *ErrorMessage;

  if (LLVMTargetMachineEmitToFile(
          TargetMachine_val(Machine), Module_val(Module),
          (char *)String_val(FileName), Int_val(FileType), &ErrorMessage)) {
    llvm_raise(*caml_named_value("Llvm_target.Error"), ErrorMessage);
  }

  return Val_unit;
}

/* Llvm.llmodule -> CodeGenFileType.t -> TargetMachine.t ->
   Llvm.llmemorybuffer */
value llvm_targetmachine_emit_to_memory_buffer(value Module, value FileType,
                                               value Machine) {
  char *ErrorMessage;
  LLVMMemoryBufferRef Buffer;

  if (LLVMTargetMachineEmitToMemoryBuffer(TargetMachine_val(Machine),
                                          Module_val(Module), Int_val(FileType),
                                          &ErrorMessage, &Buffer)) {
    llvm_raise(*caml_named_value("Llvm_target.Error"), ErrorMessage);
  }

  return to_val(Buffer);
}