#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 */
int MAP_ANONYMOUS;
void *MAP_FAILED;
int MAP_PRIVATE;
int PROT_READ;
int PROT_WRITE;
int /*<<< orphan*/ abort();
void *mmap(int /*<<< orphan*/ *, unsigned long, int, int, int,
           int /*<<< orphan*/);
int /*<<< orphan*/ perror(char *);
int /*<<< orphan*/ write_bytes(unsigned long, void *);
void balloon_inflate(unsigned long len) {
  void *addr = mmap(NULL, len, PROT_READ | PROT_WRITE,
                    MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
  if (addr == MAP_FAILED) {
    perror("mmap");
    abort();
  }
  write_bytes(len, addr);
}


x86 assembly (clang, -O0):
<balloon_inflate>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
mov    %rdi,-0x8(%rbp)
mov    -0x8(%rbp),%rsi
mov    0x2ea1(%rip),%rax
mov    (%rax),%edx
mov    0x2e70(%rip),%rax
or     (%rax),%edx
mov    0x2e77(%rip),%rax
mov    (%rax),%ecx
mov    0x2e56(%rip),%rax
or     (%rax),%ecx
xor    %eax,%eax
mov    %eax,%edi
mov    $0xffffffff,%r8d
xor    %r9d,%r9d
call   1040 <mmap@plt>
mov    %rax,-0x10(%rbp)
mov    -0x10(%rbp),%rax
mov    0x2e2b(%rip),%rcx
cmp    (%rcx),%rax
jne    11b1 <balloon_inflate+0x71>
lea    0xe5b(%rip),%rdi
call   1060 <perror@plt>
mov    $0x0,%al
call   1030 <abort@plt>
mov    -0x8(%rbp),%rdi
mov    -0x10(%rbp),%rsi
call   1050 <write_bytes@plt>
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<balloon_inflate>:
push   %rbx
mov    %rdi,%rbx
mov    0x2ead(%rip),%rax
mov    0x2e7e(%rip),%rcx
mov    (%rcx),%edx
or     (%rax),%edx
mov    0x2e83(%rip),%rax
mov    0x2e64(%rip),%rcx
mov    (%rcx),%ecx
or     (%rax),%ecx
xor    %edi,%edi
mov    %rbx,%rsi
mov    $0xffffffff,%r8d
xor    %r9d,%r9d
call   1040 <mmap@plt>
mov    0x2e3e(%rip),%rcx
cmp    (%rcx),%rax
je     1193 <balloon_inflate+0x53>
mov    %rbx,%rdi
mov    %rax,%rsi
pop    %rbx
jmp    1050 <write_bytes@plt>
lea    0xe66(%rip),%rdi
call   1060 <perror@plt>
xor    %eax,%eax
call   1030 <abort@plt>

LLVM IR (-O0):
@PROT_READ = global i32 0
@PROT_WRITE = global i32 0
@MAP_ANONYMOUS = global i32 0
@MAP_PRIVATE = global i32 0
@MAP_FAILED = global i8* null
@.str = [5 x i8] c"mmap\00"
define void @balloon_inflate(i64 %0) {
%2 = alloca i64
%3 = alloca i8*
store i64 %0, i64* %2
%4 = load i64, i64* %2
%5 = load i32, i32* @PROT_READ
%6 = load i32, i32* @PROT_WRITE
%7 = or i32 %5, %6
%8 = load i32, i32* @MAP_ANONYMOUS
%9 = load i32, i32* @MAP_PRIVATE
%10 = or i32 %8, %9
%11 = call i8* @mmap(i32* null, i64 %4, i32 %7, i32 %10, i32 -1, i32 0)
store i8* %11, i8** %3
%12 = load i8*, i8** %3
%13 = load i8*, i8** @MAP_FAILED
%14 = icmp eq i8* %12, %13
br i1 %14, label %15, label %18
15: ; preds = %1
%16 = call i32 @perror(i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str, i64 0, i64 0))
%17 = call i32 (...) @abort()
unreachable
18: ; preds = %1
%19 = load i64, i64* %2
%20 = load i8*, i8** %3
%21 = call i32 @write_bytes(i64 %19, i8* %20)
ret void
}

LLVM IR (-O2):
@PROT_READ = global i32 0
@PROT_WRITE = global i32 0
@MAP_ANONYMOUS = global i32 0
@MAP_PRIVATE = global i32 0
@MAP_FAILED = global i8* null
@.str = [5 x i8] c"mmap\00"
define void @balloon_inflate(i64 %0) {
%2 = load i32, i32* @PROT_READ
%3 = load i32, i32* @PROT_WRITE
%4 = or i32 %3, %2
%5 = load i32, i32* @MAP_ANONYMOUS
%6 = load i32, i32* @MAP_PRIVATE
%7 = or i32 %6, %5
%8 = tail call i8* @mmap(i32* null, i64 %0, i32 %4, i32 %7, i32 -1, i32 0)
%9 = load i8*, i8** @MAP_FAILED
%10 = icmp eq i8* %8, %9
br i1 %10, label %11, label %14
11: ; preds = %1
%12 = tail call i32 @perror(i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str, i64 0, i64 0))
%13 = tail call i32 (...) @abort()
unreachable
14: ; preds = %1
%15 = tail call i32 @write_bytes(i64 %0, i8* %8)
ret void
}