#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;
int /*<<< orphan*/ abort();
int /*<<< orphan*/ fclose(int /*<<< orphan*/ *);
int /*<<< orphan*/ *fopen(char const *, char *);
int /*<<< orphan*/ fread(char *, long, int, int /*<<< orphan*/ *);
int /*<<< orphan*/ fseek(int /*<<< orphan*/ *, int /*<<< orphan*/,
                         int /*<<< orphan*/);
long ftell(int /*<<< orphan*/ *);
scalar_t__ malloc(int);
int /*<<< orphan*/ perror(char *);
char *create_filebuffer(const char *filename) {
  FILE *fp = fopen(filename, "r");
  if (!fp) {
    perror("[!] Could not open file.\n");
    abort();
  }
  fseek(fp, 0, SEEK_END);
  long pos = ftell(fp);
  char *buffer = (char *)malloc(sizeof(char) * pos + 1);
  fseek(fp, 0, SEEK_SET);
  fread(buffer, pos, 1, fp);
  fclose(fp);
  buffer[pos] = '\0';
  return buffer;
}


x86 assembly (clang, -O0):
<create_filebuffer>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
mov    %rdi,-0x8(%rbp)
mov    -0x8(%rbp),%rdi
lea    0xe69(%rip),%rsi
call   1090 <fopen@plt>
mov    %rax,-0x10(%rbp)
cmpq   $0x0,-0x10(%rbp)
jne    11be <create_filebuffer+0x3e>
lea    0xe50(%rip),%rdi
call   10a0 <perror@plt>
mov    $0x0,%al
call   1030 <abort@plt>
mov    -0x10(%rbp),%rdi
mov    0x2e1f(%rip),%rax
mov    (%rax),%edx
xor    %esi,%esi
call   1080 <fseek@plt>
mov    -0x10(%rbp),%rdi
call   1060 <ftell@plt>
mov    %rax,-0x18(%rbp)
mov    -0x18(%rbp),%rax
shl    $0x0,%rax
add    $0x1,%rax
mov    %eax,%edi
call   1070 <malloc@plt>
mov    %rax,-0x20(%rbp)
mov    -0x10(%rbp),%rdi
mov    0x2dd7(%rip),%rax
mov    (%rax),%edx
xor    %esi,%esi
call   1080 <fseek@plt>
mov    -0x20(%rbp),%rdi
mov    -0x18(%rbp),%rsi
mov    -0x10(%rbp),%rcx
mov    $0x1,%edx
call   1040 <fread@plt>
mov    -0x10(%rbp),%rdi
call   1050 <fclose@plt>
mov    -0x20(%rbp),%rax
mov    -0x18(%rbp),%rcx
movb   $0x0,(%rax,%rcx,1)
mov    -0x20(%rbp),%rax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<create_filebuffer>:
push   %r15
push   %r14
push   %rbx
lea    0xe74(%rip),%rsi
call   1090 <fopen@plt>
test   %rax,%rax
je     11fe <create_filebuffer+0x7e>
mov    %rax,%rbx
mov    0x2e48(%rip),%rax
mov    (%rax),%edx
mov    %rbx,%rdi
xor    %esi,%esi
call   1080 <fseek@plt>
mov    %rbx,%rdi
call   1060 <ftell@plt>
mov    %rax,%r14
lea    0x1(%rax),%edi
call   1070 <malloc@plt>
mov    %rax,%r15
mov    0x2e0f(%rip),%rax
mov    (%rax),%edx
mov    %rbx,%rdi
xor    %esi,%esi
call   1080 <fseek@plt>
mov    %r15,%rdi
mov    %r14,%rsi
mov    $0x1,%edx
mov    %rbx,%rcx
call   1040 <fread@plt>
mov    %rbx,%rdi
call   1050 <fclose@plt>
movb   $0x0,(%r15,%r14,1)
mov    %r15,%rax
pop    %rbx
pop    %r14
pop    %r15
ret
lea    0xdfd(%rip),%rdi
call   10a0 <perror@plt>
xor    %eax,%eax
call   1030 <abort@plt>

LLVM IR (-O0):
@.str = [2 x i8] c"r\00"
@.str.1 = [26 x i8] c"[!] Could not open file.\0A\00"
@SEEK_END = global i32 0
@SEEK_SET = global i32 0
define i8* @create_filebuffer(i8* %0) {
%2 = alloca i8*
%3 = alloca i32*
%4 = alloca i64
%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 %13, label %10
10: ; preds = %1
%11 = call i32 @perror(i8* getelementptr inbounds ([26 x i8], [26 x i8]* @.str.1, i64 0, i64 0))
%12 = call i32 (...) @abort()
unreachable
13: ; preds = %1
%14 = load i32*, i32** %3
%15 = load i32, i32* @SEEK_END
%16 = call i32 @fseek(i32* %14, i32 0, i32 %15)
%17 = load i32*, i32** %3
%18 = call i64 @ftell(i32* %17)
store i64 %18, i64* %4
%19 = load i64, i64* %4
%20 = mul i64 1, %19
%21 = add i64 %20, 1
%22 = trunc i64 %21 to i32
%23 = call i64 @malloc(i32 %22)
%24 = inttoptr i64 %23 to i8*
store i8* %24, i8** %5
%25 = load i32*, i32** %3
%26 = load i32, i32* @SEEK_SET
%27 = call i32 @fseek(i32* %25, i32 0, i32 %26)
%28 = load i8*, i8** %5
%29 = load i64, i64* %4
%30 = load i32*, i32** %3
%31 = call i32 @fread(i8* %28, i64 %29, i32 1, i32* %30)
%32 = load i32*, i32** %3
%33 = call i32 @fclose(i32* %32)
%34 = load i8*, i8** %5
%35 = load i64, i64* %4
%36 = getelementptr inbounds i8, i8* %34, i64 %35
store i8 0, i8* %36
%37 = load i8*, i8** %5
ret i8* %37
}

LLVM IR (-O2):
@.str = [2 x i8] c"r\00"
@.str.1 = [26 x i8] c"[!] Could not open file.\0A\00"
@SEEK_END = global i32 0
@SEEK_SET = global i32 0
define i8* @create_filebuffer(i8* nocapture %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 %7
4: ; preds = %1
%5 = tail call i32 @perror(i8* getelementptr inbounds ([26 x i8], [26 x i8]* @.str.1, i64 0, i64 0))
%6 = tail call i32 (...) @abort()
unreachable
7: ; preds = %1
%8 = load i32, i32* @SEEK_END
%9 = tail call i32 @fseek(i32* %2, i32 0, i32 %8)
%10 = tail call i64 @ftell(i32* %2)
%11 = trunc i64 %10 to i32
%12 = add i32 %11, 1
%13 = tail call i64 @malloc(i32 %12)
%14 = inttoptr i64 %13 to i8*
%15 = load i32, i32* @SEEK_SET
%16 = tail call i32 @fseek(i32* %2, i32 0, i32 %15)
%17 = tail call i32 @fread(i8* %14, i64 %10, i32 1, i32* %2)
%18 = tail call i32 @fclose(i32* %2)
%19 = getelementptr inbounds i8, i8* %14, i64 %10
store i8 0, i8* %19
ret i8* %14
}