#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 */

/* Variables and functions */
unsigned char *MAP_FAILED;
int /*<<< orphan*/ MAP_SHARED;
int /*<<< orphan*/ O_RDWR;
int PROT_READ;
int PROT_WRITE;
int /*<<< orphan*/ exit(int);
scalar_t__ mmap(int /*<<< orphan*/, int, int, int /*<<< orphan*/, int,
                int /*<<< orphan*/);
int /*<<< orphan*/ munmap(unsigned char *, int);
int open(char *, int /*<<< orphan*/);
int /*<<< orphan*/ printf(char *, ...);
int main() {
  int fd;
  int i;
  unsigned char *p_map;
  fd = open("/dev/buddy_test", O_RDWR);
  if (fd < 0) {
    printf("open fault\n");
    exit(1);
  }
  p_map =
      (unsigned char *)mmap(0, 4096, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
  if (p_map == MAP_FAILED) {
    printf("mmap fault\n");
    goto here;
  }
  for (i = 0; i < 10; i++)
    printf("%d\n", p_map[i]);
here:
  munmap(p_map, 4096);
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
movl   $0x0,-0x4(%rbp)
mov    0x2e72(%rip),%rax
mov    (%rax),%esi
lea    0xe91(%rip),%rdi
call   1060 <open@plt>
mov    %eax,-0x8(%rbp)
cmpl   $0x0,-0x8(%rbp)
jge    1199 <main+0x49>
lea    0xe88(%rip),%rdi
mov    $0x0,%al
call   1040 <printf@plt>
mov    $0x1,%edi
call   1070 <exit@plt>
mov    0x2e58(%rip),%rax
mov    (%rax),%edx
mov    0x2e1f(%rip),%rax
or     (%rax),%edx
mov    0x2e36(%rip),%rax
mov    (%rax),%ecx
mov    -0x8(%rbp),%r8d
xor    %r9d,%r9d
mov    $0x1000,%esi
mov    %r9d,%edi
call   1030 <mmap@plt>
mov    %rax,-0x18(%rbp)
mov    -0x18(%rbp),%rax
mov    0x2de9(%rip),%rcx
cmp    (%rcx),%rax
jne    11f3 <main+0xa3>
lea    0xe35(%rip),%rdi
mov    $0x0,%al
call   1040 <printf@plt>
jmp    1231 <main+0xe1>
movl   $0x0,-0xc(%rbp)
cmpl   $0xa,-0xc(%rbp)
jge    122c <main+0xdc>
mov    -0x18(%rbp),%rax
movslq -0xc(%rbp),%rcx
movzbl (%rax,%rcx,1),%esi
lea    0xe11(%rip),%rdi
mov    $0x0,%al
call   1040 <printf@plt>
mov    -0xc(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0xc(%rbp)
jmp    11fa <main+0xaa>
jmp    1231 <main+0xe1>
mov    -0x18(%rbp),%rdi
mov    $0x1000,%esi
call   1050 <munmap@plt>
xor    %eax,%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %r14
push   %rbx
push   %rax
mov    0x2e6d(%rip),%rax
mov    (%rax),%esi
lea    0xe8c(%rip),%rdi
call   1070 <open@plt>
test   %eax,%eax
js     1278 <main+0x118>
mov    0x2e70(%rip),%rcx
mov    0x2e39(%rip),%rdx
mov    (%rdx),%edx
or     (%rcx),%edx
mov    0x2e4e(%rip),%rcx
mov    (%rcx),%ecx
xor    %edi,%edi
mov    $0x1000,%esi
mov    %eax,%r8d
xor    %r9d,%r9d
call   1040 <mmap@plt>
mov    %rax,%rbx
mov    0x2e08(%rip),%rax
cmp    %rbx,(%rax)
je     1255 <main+0xf5>
movzbl (%rbx),%esi
lea    0xe45(%rip),%r14
mov    %r14,%rdi
xor    %eax,%eax
call   1050 <printf@plt>
movzbl 0x1(%rbx),%esi
mov    %r14,%rdi
xor    %eax,%eax
call   1050 <printf@plt>
movzbl 0x2(%rbx),%esi
mov    %r14,%rdi
xor    %eax,%eax
call   1050 <printf@plt>
movzbl 0x3(%rbx),%esi
mov    %r14,%rdi
xor    %eax,%eax
call   1050 <printf@plt>
movzbl 0x4(%rbx),%esi
mov    %r14,%rdi
xor    %eax,%eax
call   1050 <printf@plt>
movzbl 0x5(%rbx),%esi
mov    %r14,%rdi
xor    %eax,%eax
call   1050 <printf@plt>
movzbl 0x6(%rbx),%esi
mov    %r14,%rdi
xor    %eax,%eax
call   1050 <printf@plt>
movzbl 0x7(%rbx),%esi
mov    %r14,%rdi
xor    %eax,%eax
call   1050 <printf@plt>
movzbl 0x8(%rbx),%esi
mov    %r14,%rdi
xor    %eax,%eax
call   1050 <printf@plt>
movzbl 0x9(%rbx),%esi
mov    %r14,%rdi
xor    %eax,%eax
call   1050 <printf@plt>
jmp    1261 <main+0x101>
lea    0xdb8(%rip),%rdi
call   1030 <puts@plt>
mov    %rbx,%rdi
mov    $0x1000,%esi
call   1060 <munmap@plt>
xor    %eax,%eax
add    $0x8,%rsp
pop    %rbx
pop    %r14
ret
lea    0xda0(%rip),%rdi
call   1030 <puts@plt>
mov    $0x1,%edi
call   1080 <exit@plt>

LLVM IR (-O0):
@.str = [16 x i8] c"/dev/buddy_test\00"
@O_RDWR = global i32 0
@.str.1 = [12 x i8] c"open fault\0A\00"
@PROT_READ = global i32 0
@PROT_WRITE = global i32 0
@MAP_SHARED = global i32 0
@MAP_FAILED = global i8* null
@.str.2 = [12 x i8] c"mmap fault\0A\00"
@.str.3 = [4 x i8] c"%d\0A\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca i32
%3 = alloca i32
%4 = alloca i8*
store i32 0, i32* %1
%5 = load i32, i32* @O_RDWR
%6 = call i32 @open(i8* getelementptr inbounds ([16 x i8], [16 x i8]* @.str, i64 0, i64 0), i32 %5)
store i32 %6, i32* %2
%7 = load i32, i32* %2
%8 = icmp slt i32 %7, 0
br i1 %8, label %9, label %12
9: ; preds = %0
%10 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([12 x i8], [12 x i8]* @.str.1, i64 0, i64 0))
%11 = call i32 @exit(i32 1)
unreachable
12: ; preds = %0
%13 = load i32, i32* @PROT_READ
%14 = load i32, i32* @PROT_WRITE
%15 = or i32 %13, %14
%16 = load i32, i32* @MAP_SHARED
%17 = load i32, i32* %2
%18 = call i64 @mmap(i32 0, i32 4096, i32 %15, i32 %16, i32 %17, i32 0)
%19 = inttoptr i64 %18 to i8*
store i8* %19, i8** %4
%20 = load i8*, i8** %4
%21 = load i8*, i8** @MAP_FAILED
%22 = icmp eq i8* %20, %21
br i1 %22, label %23, label %25
23: ; preds = %12
%24 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([12 x i8], [12 x i8]* @.str.2, i64 0, i64 0))
br label %41
25: ; preds = %12
store i32 0, i32* %3
br label %26
26: ; preds = %37, %25
%27 = load i32, i32* %3
%28 = icmp slt i32 %27, 10
br i1 %28, label %29, label %40
29: ; preds = %26
%30 = load i8*, i8** %4
%31 = load i32, i32* %3
%32 = sext i32 %31 to i64
%33 = getelementptr inbounds i8, i8* %30, i64 %32
%34 = load i8, i8* %33
%35 = zext i8 %34 to i32
%36 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.3, i64 0, i64 0), i32 %35)
br label %37
37: ; preds = %29
%38 = load i32, i32* %3
%39 = add nsw i32 %38, 1
store i32 %39, i32* %3
br label %26
40: ; preds = %26
br label %41
41: ; preds = %40, %23
%42 = load i8*, i8** %4
%43 = call i32 @munmap(i8* %42, i32 4096)
ret i32 0
}

LLVM IR (-O2):
@.str = [16 x i8] c"/dev/buddy_test\00"
@O_RDWR = global i32 0
@PROT_READ = global i32 0
@PROT_WRITE = global i32 0
@MAP_SHARED = global i32 0
@MAP_FAILED = global i8* null
@.str.3 = [4 x i8] c"%d\0A\00"
@str = [11 x i8] c"mmap fault\00"
@str.4 = [11 x i8] c"open fault\00"
define i32 @main() {
%1 = load i32, i32* @O_RDWR
%2 = tail call i32 @open(i8* getelementptr inbounds ([16 x i8], [16 x i8]* @.str, i64 0, i64 0), i32 %1)
%3 = icmp slt i32 %2, 0
br i1 %3, label %4, label %7
4: ; preds = %0
%5 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([11 x i8], [11 x i8]* @str.4, i64 0, i64 0))
%6 = tail call i32 @exit(i32 1)
unreachable
7: ; preds = %0
%8 = load i32, i32* @PROT_READ
%9 = load i32, i32* @PROT_WRITE
%10 = or i32 %9, %8
%11 = load i32, i32* @MAP_SHARED
%12 = tail call i64 @mmap(i32 0, i32 4096, i32 %10, i32 %11, i32 %2, i32 0)
%13 = inttoptr i64 %12 to i8*
%14 = load i8*, i8** @MAP_FAILED
%15 = icmp eq i8* %14, %13
br i1 %15, label %56, label %16
16: ; preds = %7
%17 = load i8, i8* %13
%18 = zext i8 %17 to i32
%19 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([4 x i8], [4 x i8]* @.str.3, i64 0, i64 0), i32 %18)
%20 = getelementptr inbounds i8, i8* %13, i64 1
%21 = load i8, i8* %20
%22 = zext i8 %21 to i32
%23 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([4 x i8], [4 x i8]* @.str.3, i64 0, i64 0), i32 %22)
%24 = getelementptr inbounds i8, i8* %13, i64 2
%25 = load i8, i8* %24
%26 = zext i8 %25 to i32
%27 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([4 x i8], [4 x i8]* @.str.3, i64 0, i64 0), i32 %26)
%28 = getelementptr inbounds i8, i8* %13, i64 3
%29 = load i8, i8* %28
%30 = zext i8 %29 to i32
%31 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([4 x i8], [4 x i8]* @.str.3, i64 0, i64 0), i32 %30)
%32 = getelementptr inbounds i8, i8* %13, i64 4
%33 = load i8, i8* %32
%34 = zext i8 %33 to i32
%35 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([4 x i8], [4 x i8]* @.str.3, i64 0, i64 0), i32 %34)
%36 = getelementptr inbounds i8, i8* %13, i64 5
%37 = load i8, i8* %36
%38 = zext i8 %37 to i32
%39 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([4 x i8], [4 x i8]* @.str.3, i64 0, i64 0), i32 %38)
%40 = getelementptr inbounds i8, i8* %13, i64 6
%41 = load i8, i8* %40
%42 = zext i8 %41 to i32
%43 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([4 x i8], [4 x i8]* @.str.3, i64 0, i64 0), i32 %42)
%44 = getelementptr inbounds i8, i8* %13, i64 7
%45 = load i8, i8* %44
%46 = zext i8 %45 to i32
%47 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([4 x i8], [4 x i8]* @.str.3, i64 0, i64 0), i32 %46)
%48 = getelementptr inbounds i8, i8* %13, i64 8
%49 = load i8, i8* %48
%50 = zext i8 %49 to i32
%51 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([4 x i8], [4 x i8]* @.str.3, i64 0, i64 0), i32 %50)
%52 = getelementptr inbounds i8, i8* %13, i64 9
%53 = load i8, i8* %52
%54 = zext i8 %53 to i32
%55 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([4 x i8], [4 x i8]* @.str.3, i64 0, i64 0), i32 %54)
br label %58
56: ; preds = %7
%57 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([11 x i8], [11 x i8]* @str, i64 0, i64 0))
br label %58
58: ; preds = %16, %56
%59 = tail call i32 @munmap(i8* %13, i32 4096)
ret i32 0
}