#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 errno;
int /*<<< orphan*/ exit(int);
int /*<<< orphan*/ fprintf(int /*<<< orphan*/, char *, char const *, int,
                           char *);
int /*<<< orphan*/ stderr;
char *strdup(char const *);
char *strerror(int);
char *xstrdup(const char *s) {
  char *ret = strdup(s);
  if (ret == NULL) {
    fprintf(stderr, "xstrdup(%p): Cannot duplicate string (#%i: %s).\n", s,
            errno, strerror(errno));
    exit(errno);
  }
  return ret;
}


x86 assembly (clang, -O0):
<xstrdup>:
push   %rbp
mov    %rsp,%rbp
sub    $0x30,%rsp
mov    %rdi,-0x8(%rbp)
mov    -0x8(%rbp),%rdi
call   1050 <strdup@plt>
mov    %rax,-0x10(%rbp)
cmpq   $0x0,-0x10(%rbp)
jne    11b9 <xstrdup+0x79>
mov    0x2e75(%rip),%rax
mov    (%rax),%eax
mov    %eax,-0x24(%rbp)
mov    -0x8(%rbp),%rax
mov    %rax,-0x20(%rbp)
mov    0x2e59(%rip),%rax
mov    (%rax),%eax
mov    %eax,-0x14(%rbp)
mov    0x2e4d(%rip),%rax
mov    (%rax),%edi
call   1060 <strerror@plt>
mov    -0x24(%rbp),%edi
mov    -0x20(%rbp),%rdx
mov    -0x14(%rbp),%ecx
mov    %rax,%r8
lea    0xe5a(%rip),%rsi
call   1030 <fprintf@plt>
mov    0x2e26(%rip),%rax
mov    (%rax),%edi
call   1040 <exit@plt>
mov    -0x10(%rbp),%rax
add    $0x30,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<xstrdup>:
push   %rbp
push   %r15
push   %r14
push   %rbx
push   %rax
mov    %rdi,%rbx
call   1050 <strdup@plt>
test   %rax,%rax
je     115f <xstrdup+0x1f>
add    $0x8,%rsp
pop    %rbx
pop    %r14
pop    %r15
pop    %rbp
ret
mov    0x2e7a(%rip),%rax
mov    (%rax),%r14d
mov    0x2e68(%rip),%r15
mov    (%r15),%ebp
mov    %ebp,%edi
call   1060 <strerror@plt>
lea    0xe7f(%rip),%rsi
mov    %r14d,%edi
mov    %rbx,%rdx
mov    %ebp,%ecx
mov    %rax,%r8
call   1030 <fprintf@plt>
mov    (%r15),%edi
call   1040 <exit@plt>

LLVM IR (-O0):
@stderr = global i32 0
@.str = [49 x i8] c"xstrdup(%p): Cannot duplicate string (#%i: %s).\0A\00"
@errno = global i32 0
define i8* @xstrdup(i8* %0) {
%2 = alloca i8*
%3 = alloca i8*
store i8* %0, i8** %2
%4 = load i8*, i8** %2
%5 = call i8* @strdup(i8* %4)
store i8* %5, i8** %3
%6 = load i8*, i8** %3
%7 = icmp eq i8* %6, null
br i1 %7, label %8, label %17
8: ; preds = %1
%9 = load i32, i32* @stderr
%10 = load i8*, i8** %2
%11 = load i32, i32* @errno
%12 = load i32, i32* @errno
%13 = call i8* @strerror(i32 %12)
%14 = call i32 @fprintf(i32 %9, i8* getelementptr inbounds ([49 x i8], [49 x i8]* @.str, i64 0, i64 0), i8* %10, i32 %11, i8* %13)
%15 = load i32, i32* @errno
%16 = call i32 @exit(i32 %15)
unreachable
17: ; preds = %1
%18 = load i8*, i8** %3
ret i8* %18
}

LLVM IR (-O2):
@stderr = global i32 0
@.str = [49 x i8] c"xstrdup(%p): Cannot duplicate string (#%i: %s).\0A\00"
@errno = global i32 0
define noalias i8* @xstrdup(i8* %0) {
%2 = tail call i8* @strdup(i8* %0)
%3 = icmp eq i8* %2, null
br i1 %3, label %4, label %11
4: ; preds = %1
%5 = load i32, i32* @stderr
%6 = load i32, i32* @errno
%7 = tail call i8* @strerror(i32 %6)
%8 = tail call i32 @fprintf(i32 %5, i8* getelementptr inbounds ([49 x i8], [49 x i8]* @.str, i64 0, i64 0), i8* %0, i32 %6, i8* %7)
%9 = load i32, i32* @errno
%10 = tail call i32 @exit(i32 %9)
unreachable
11: ; preds = %1
ret i8* %2
}