offload/plugins-nextgen/host/dynamic_ffi/ffi.h

   1 //===--- generic-elf-64bit/dynamic_ffi/ffi.cpp -------------------- C++ -*-===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8 //
   9 // Provides a mirror to the parts of the FFI interface that the plugins require.
  10 //
  11 // libffi
  12 //   - Copyright (c) 2011, 2014, 2019, 2021, 2022 Anthony Green
  13 //   - Copyright (c) 1996-2003, 2007, 2008 Red Hat, Inc.
  14 //
  15 //===----------------------------------------------------------------------===//
  16
  17 #ifndef DYNAMIC_FFI_FFI_H
  18 #define DYNAMIC_FFI_FFI_H
  19
  20 #include <stddef.h>
  21 #include <stdint.h>
  22
  23 #define USES_DYNAMIC_FFI
  24
  25 uint32_t ffi_init();
  26
  27 typedef struct _ffi_type {
  28   size_t size;
  29   unsigned short alignment;
  30   unsigned short type;
  31   struct _ffi_type **elements;
  32 } ffi_type;
  33
  34 typedef enum {
  35   FFI_OK = 0,
  36   FFI_BAD_TYPEDEF,
  37   FFI_BAD_ABI,
  38   FFI_BAD_ARGTYPE
  39 } ffi_status;
  40
  41 // These are target depenent so we set them manually for each ABI by referencing
  42 // the FFI source.
  43 typedef enum ffi_abi {
  44 #if (defined(_M_X64) || defined(__x86_64__))
  45   FFI_DEFAULT_ABI = 2, // FFI_UNIX64.
  46 #elif defined(__aarch64__) || defined(__arm64__) || defined(_M_ARM64)
  47   FFI_DEFAULT_ABI = 1, // FFI_SYSV.
  48 #elif defined(__powerpc64__)
  49   FFI_DEFAULT_ABI = 8, // FFI_LINUX.
  50 #elif defined(__s390x__)
  51   FFI_DEFAULT_ABI = 1, // FFI_SYSV.
  52 #else
  53 #error "Unknown ABI"
  54 #endif
  55 } ffi_cif;
  56
  57 #ifdef __cplusplus
  58 extern "C" {
  59 #endif
  60
  61 #define FFI_EXTERN extern
  62 #define FFI_API
  63
  64 FFI_EXTERN ffi_type ffi_type_void;
  65 FFI_EXTERN ffi_type ffi_type_pointer;
  66
  67 FFI_API
  68 void ffi_call(ffi_cif *cif, void (*fn)(void), void *rvalue, void **avalue);
  69
  70 FFI_API
  71 ffi_status ffi_prep_cif(ffi_cif *cif, ffi_abi abi, unsigned int nargs,
  72                         ffi_type *rtype, ffi_type **atypes);
  73
  74 #ifdef __cplusplus
  75 }
  76 #endif
  77
  78 #endif // DYNAMIC_FFI_FFI_H