bitreader.go raw

   1  //go:build !purego
   2  
   3  //===- bitreader.go - Bindings for bitreader ------------------------------===//
   4  //
   5  // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   6  // See https://llvm.org/LICENSE.txt for license information.
   7  // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   8  //
   9  //===----------------------------------------------------------------------===//
  10  //
  11  // This file defines bindings for the bitreader component.
  12  //
  13  //===----------------------------------------------------------------------===//
  14  
  15  package llvm
  16  
  17  /*
  18  #include "llvm-c/BitReader.h"
  19  #include "llvm-c/Core.h"
  20  #include <stdlib.h>
  21  */
  22  import "C"
  23  
  24  import (
  25  	"errors"
  26  	"unsafe"
  27  )
  28  
  29  // ParseBitcodeFile parses the LLVM IR (bitcode) in the file with the specified
  30  // name, and returns a new LLVM module.
  31  func (c Context) ParseBitcodeFile(name string) (Module, error) {
  32  	var buf C.LLVMMemoryBufferRef
  33  	var errmsg *C.char
  34  	var cfilename *C.char = C.CString(name)
  35  	defer C.free(unsafe.Pointer(cfilename))
  36  	result := C.LLVMCreateMemoryBufferWithContentsOfFile(cfilename, &buf, &errmsg)
  37  	if result != 0 {
  38  		err := errors.New(C.GoString(errmsg))
  39  		C.free(unsafe.Pointer(errmsg))
  40  		return Module{}, err
  41  	}
  42  	defer C.LLVMDisposeMemoryBuffer(buf)
  43  
  44  	var m Module
  45  	if C.LLVMParseBitcodeInContext2(c.C, buf, &m.C) == 0 {
  46  		return m, nil
  47  	}
  48  
  49  	err := errors.New(C.GoString(errmsg))
  50  	C.free(unsafe.Pointer(errmsg))
  51  	return Module{}, err
  52  }
  53