#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*/ buff;

/* Variables and functions */
int PATH_MAX;
int /*<<< orphan*/ exit(int);
int getrname(char *, int);
int /*<<< orphan*/ printf(char *, ...);
int main(int argc, char **argv) {
  char buff[PATH_MAX];
  if (getrname(buff, sizeof(buff)) == -1) {
    printf("get run name error.\n");
    exit(1);
  }
  printf("run name: %s\n", buff);
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x30,%rsp
movl   $0x0,-0x4(%rbp)
mov    %edi,-0x8(%rbp)
mov    %rsi,-0x10(%rbp)
mov    0x2ea3(%rip),%rax
mov    (%rax),%eax
mov    %rsp,%rcx
mov    %rcx,-0x18(%rbp)
mov    %rax,%rcx
add    $0xf,%rcx
and    $0xfffffffffffffff0,%rcx
mov    %rsp,%rdi
sub    %rcx,%rdi
mov    %rdi,-0x28(%rbp)
mov    %rdi,%rsp
mov    %rax,-0x20(%rbp)
mov    %eax,%esi
call   1040 <getrname@plt>
cmp    $0xffffffff,%eax
jne    119a <main+0x6a>
lea    0xe77(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
mov    $0x1,%edi
call   1050 <exit@plt>
mov    -0x28(%rbp),%rsi
lea    0xe70(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
movl   $0x0,-0x4(%rbp)
mov    -0x18(%rbp),%rax
mov    %rax,%rsp
mov    -0x4(%rbp),%eax
mov    %rbp,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rbp
mov    %rsp,%rbp
push   %rbx
push   %rax
mov    0x2ea3(%rip),%rax
mov    (%rax),%esi
mov    %rsp,%rbx
mov    %rsi,%rax
add    $0xf,%rax
and    $0xfffffffffffffff0,%rax
sub    %rax,%rbx
mov    %rbx,%rsp
mov    %rbx,%rdi
call   1050 <getrname@plt>
cmp    $0xffffffff,%eax
je     118a <main+0x4a>
lea    0xe89(%rip),%rdi
mov    %rbx,%rsi
xor    %eax,%eax
call   1040 <printf@plt>
xor    %eax,%eax
lea    -0x8(%rbp),%rsp
pop    %rbx
pop    %rbp
ret
lea    0xe7d(%rip),%rdi
call   1030 <puts@plt>
mov    $0x1,%edi
call   1060 <exit@plt>

LLVM IR (-O0):
@PATH_MAX = global i32 0
@.str = [21 x i8] c"get run name error.\0A\00"
@.str.1 = [14 x i8] c"run name: %s\0A\00"
define i32 @main(i32 %0, i8** %1) {
%3 = alloca i32
%4 = alloca i32
%5 = alloca i8**
%6 = alloca i8*
%7 = alloca i64
store i32 0, i32* %3
store i32 %0, i32* %4
store i8** %1, i8*** %5
%8 = load i32, i32* @PATH_MAX
%9 = zext i32 %8 to i64
%10 = call i8* @llvm.stacksave()
store i8* %10, i8** %6
%11 = alloca i8, i64 %9
store i64 %9, i64* %7
%12 = trunc i64 %9 to i32
%13 = call i32 @getrname(i8* %11, i32 %12)
%14 = icmp eq i32 %13, -1
br i1 %14, label %15, label %18
15: ; preds = %2
%16 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([21 x i8], [21 x i8]* @.str, i64 0, i64 0))
%17 = call i32 @exit(i32 1)
unreachable
18: ; preds = %2
%19 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([14 x i8], [14 x i8]* @.str.1, i64 0, i64 0), i8* %11)
store i32 0, i32* %3
%20 = load i8*, i8** %6
%21 = load i32, i32* %3
ret i32 %21
}

LLVM IR (-O2):
@PATH_MAX = global i32 0
@.str.1 = [14 x i8] c"run name: %s\0A\00"
@str = [20 x i8] c"get run name error.\00"
define i32 @main(i32 %0, i8** nocapture readnone %1) {
%3 = load i32, i32* @PATH_MAX
%4 = zext i32 %3 to i64
%5 = alloca i8, i64 %4
%6 = call i32 @getrname(i8* %5, i32 %3)
%7 = icmp eq i32 %6, -1
br i1 %7, label %8, label %11
8: ; preds = %2
%9 = call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([20 x i8], [20 x i8]* @str, i64 0, i64 0))
%10 = call i32 @exit(i32 1)
unreachable
11: ; preds = %2
%12 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([14 x i8], [14 x i8]* @.str.1, i64 0, i64 0), i8* %5)
ret i32 0
}