#define NULL ((void *)0)
typedef unsigned long size_t; // Customize by platform.
typedef long intptr_t;
typedef unsigned long uintptr_t;
typedef long scalar_t__; // Either arithmetic or pointer type.
/* By default, we understand bool (as a convenience). */
typedef int bool;
#define false 0
#define true 1

/* Forward declarations */

/* Type definitions */
typedef int /*<<< orphan*/ FILE;

/* Variables and functions */
int /*<<< orphan*/ SEEK_END;
int /*<<< orphan*/ SEEK_SET;
char *calloc(int, int);
int /*<<< orphan*/ chalk_exit();
int /*<<< orphan*/ fclose(int /*<<< orphan*/ *);
int /*<<< orphan*/ *fopen(char *, char *);
int /*<<< orphan*/ fprintf(int /*<<< orphan*/, char *, char *);
int /*<<< orphan*/ fread(char *, int, int, int /*<<< orphan*/ *);
int /*<<< orphan*/ fseek(int /*<<< orphan*/ *, long, int /*<<< orphan*/);
int ftell(int /*<<< orphan*/ *);
int /*<<< orphan*/ stderr;
char *open_file(char *filename) {
  FILE *file = fopen(filename, "r");
  if (!file) {
    fprintf(stderr, "error : can't open file '%s' , file was not found\n",
            filename);
    chalk_exit();
  }
  fseek(file, 0L, SEEK_END);
  int size = ftell(file);
  fseek(file, 0L, SEEK_SET);
  char *buf = calloc(size, sizeof(char));
  fread(buf, size, 1, file);
  fclose(file);
  return buf;
}


x86 assembly (clang, -O0):
<open_file>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
mov    %rdi,-0x8(%rbp)
mov    -0x8(%rbp),%rdi
lea    0xe69(%rip),%rsi
call   10a0 <fopen@plt>
mov    %rax,-0x10(%rbp)
cmpq   $0x0,-0x10(%rbp)
jne    11cb <open_file+0x4b>
mov    0x2e26(%rip),%rax
mov    (%rax),%edi
mov    -0x8(%rbp),%rdx
lea    0xe43(%rip),%rsi
call   1070 <fprintf@plt>
mov    $0x0,%al
call   1030 <chalk_exit@plt>
mov    -0x10(%rbp),%rdi
mov    0x2e12(%rip),%rax
mov    (%rax),%edx
xor    %eax,%eax
mov    %eax,%esi
call   1090 <fseek@plt>
mov    -0x10(%rbp),%rdi
call   1080 <ftell@plt>
mov    %eax,-0x14(%rbp)
mov    -0x10(%rbp),%rdi
mov    0x2dd8(%rip),%rax
mov    (%rax),%edx
xor    %eax,%eax
mov    %eax,%esi
call   1090 <fseek@plt>
mov    -0x14(%rbp),%edi
mov    $0x1,%esi
call   1060 <calloc@plt>
mov    %rax,-0x20(%rbp)
mov    -0x20(%rbp),%rdi
mov    -0x14(%rbp),%esi
mov    -0x10(%rbp),%rcx
mov    $0x1,%edx
call   1040 <fread@plt>
mov    -0x10(%rbp),%rdi
call   1050 <fclose@plt>
mov    -0x20(%rbp),%rax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<open_file>:
push   %rbp
push   %r14
push   %rbx
mov    %rdi,%r14
lea    0xe72(%rip),%rsi
call   10a0 <fopen@plt>
mov    %rax,%rbx
test   %rax,%rax
jne    11ba <open_file+0x3a>
mov    0x2e36(%rip),%rax
mov    (%rax),%edi
lea    0xe57(%rip),%rsi
mov    %r14,%rdx
call   1070 <fprintf@plt>
xor    %eax,%eax
call   1030 <chalk_exit@plt>
mov    0x2e27(%rip),%rax
mov    (%rax),%edx
mov    %rbx,%rdi
xor    %esi,%esi
call   1090 <fseek@plt>
mov    %rbx,%rdi
call   1080 <ftell@plt>
mov    %eax,%r14d
mov    0x2df1(%rip),%rax
mov    (%rax),%edx
mov    %rbx,%rdi
xor    %esi,%esi
call   1090 <fseek@plt>
mov    %r14d,%edi
mov    $0x1,%esi
call   1060 <calloc@plt>
mov    %rax,%rbp
mov    %rax,%rdi
mov    %r14d,%esi
mov    $0x1,%edx
mov    %rbx,%rcx
call   1040 <fread@plt>
mov    %rbx,%rdi
call   1050 <fclose@plt>
mov    %rbp,%rax
pop    %rbx
pop    %r14
pop    %rbp
ret

LLVM IR (-O0):
@.str = [2 x i8] c"r\00"
@stderr = global i32 0
@.str.1 = [51 x i8] c"error : can't open file '%s' , file was not found\0A\00"
@SEEK_END = global i32 0
@SEEK_SET = global i32 0
define i8* @open_file(i8* %0) {
%2 = alloca i8*
%3 = alloca i32*
%4 = alloca i32
%5 = alloca i8*
store i8* %0, i8** %2
%6 = load i8*, i8** %2
%7 = call i32* @fopen(i8* %6, i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str, i64 0, i64 0))
store i32* %7, i32** %3
%8 = load i32*, i32** %3
%9 = icmp ne i32* %8, null
br i1 %9, label %15, label %10
10: ; preds = %1
%11 = load i32, i32* @stderr
%12 = load i8*, i8** %2
%13 = call i32 @fprintf(i32 %11, i8* getelementptr inbounds ([51 x i8], [51 x i8]* @.str.1, i64 0, i64 0), i8* %12)
%14 = call i32 (...) @chalk_exit()
br label %15
15: ; preds = %10, %1
%16 = load i32*, i32** %3
%17 = load i32, i32* @SEEK_END
%18 = call i32 @fseek(i32* %16, i64 0, i32 %17)
%19 = load i32*, i32** %3
%20 = call i32 @ftell(i32* %19)
store i32 %20, i32* %4
%21 = load i32*, i32** %3
%22 = load i32, i32* @SEEK_SET
%23 = call i32 @fseek(i32* %21, i64 0, i32 %22)
%24 = load i32, i32* %4
%25 = call i8* @calloc(i32 %24, i32 1)
store i8* %25, i8** %5
%26 = load i8*, i8** %5
%27 = load i32, i32* %4
%28 = load i32*, i32** %3
%29 = call i32 @fread(i8* %26, i32 %27, i32 1, i32* %28)
%30 = load i32*, i32** %3
%31 = call i32 @fclose(i32* %30)
%32 = load i8*, i8** %5
ret i8* %32
}

LLVM IR (-O2):
@.str = [2 x i8] c"r\00"
@stderr = global i32 0
@.str.1 = [51 x i8] c"error : can't open file '%s' , file was not found\0A\00"
@SEEK_END = global i32 0
@SEEK_SET = global i32 0
define noalias i8* @open_file(i8* %0) {
%2 = tail call i32* @fopen(i8* %0, i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str, i64 0, i64 0))
%3 = icmp eq i32* %2, null
br i1 %3, label %4, label %8
4: ; preds = %1
%5 = load i32, i32* @stderr
%6 = tail call i32 @fprintf(i32 %5, i8* getelementptr inbounds ([51 x i8], [51 x i8]* @.str.1, i64 0, i64 0), i8* %0)
%7 = tail call i32 (...) @chalk_exit()
br label %8
8: ; preds = %4, %1
%9 = load i32, i32* @SEEK_END
%10 = tail call i32 @fseek(i32* %2, i64 0, i32 %9)
%11 = tail call i32 @ftell(i32* %2)
%12 = load i32, i32* @SEEK_SET
%13 = tail call i32 @fseek(i32* %2, i64 0, i32 %12)
%14 = tail call i8* @calloc(i32 %11, i32 1)
%15 = tail call i32 @fread(i8* %14, i32 %11, i32 1, i32* %2)
%16 = tail call i32 @fclose(i32* %2)
ret i8* %14
}