#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 /*<<< orphan*/ EXIT_FAILURE;
size_t backtrace(void **, int);
char **backtrace_symbols(void **, size_t);
int /*<<< orphan*/ exit(int /*<<< orphan*/);
int /*<<< orphan*/ free(char **);
int /*<<< orphan*/ perror(char *);
int /*<<< orphan*/ printf(char *, ...);
void print_trace(void) {
  void *array[20];
  size_t size;
  char **strings;
  size_t i;
  size = backtrace(array, 20);
  strings = backtrace_symbols(array, size);
  if (strings == NULL) {
    perror("backtrace_synbols");
    exit(EXIT_FAILURE);
  }
  printf("Obtained %zd stack frames.\n", size);
  for (i = 0; i < size; i++)
    printf("%s\n", strings[i]);
  free(strings);
  strings = NULL;
}


x86 assembly (clang, -O0):
<print_trace>:
push   %rbp
mov    %rsp,%rbp
sub    $0xc0,%rsp
lea    -0xa0(%rbp),%rdi
mov    $0x14,%esi
call   1050 <backtrace@plt>
mov    %rax,-0xa8(%rbp)
lea    -0xa0(%rbp),%rdi
mov    -0xa8(%rbp),%rsi
call   1040 <backtrace_symbols@plt>
mov    %rax,-0xb0(%rbp)
cmpq   $0x0,-0xb0(%rbp)
jne    11c5 <print_trace+0x65>
lea    0xe4e(%rip),%rdi
call   1070 <perror@plt>
mov    0x2e22(%rip),%rax
mov    (%rax),%edi
call   1080 <exit@plt>
mov    -0xa8(%rbp),%rsi
lea    0xe3f(%rip),%rdi
mov    $0x0,%al
call   1060 <printf@plt>
movq   $0x0,-0xb8(%rbp)
mov    -0xb8(%rbp),%rax
cmp    -0xa8(%rbp),%rax
jae    1230 <print_trace+0xd0>
mov    -0xb0(%rbp),%rax
mov    -0xb8(%rbp),%rcx
mov    (%rax,%rcx,8),%rsi
lea    0xe1c(%rip),%rdi
mov    $0x0,%al
call   1060 <printf@plt>
mov    -0xb8(%rbp),%rax
add    $0x1,%rax
mov    %rax,-0xb8(%rbp)
jmp    11e5 <print_trace+0x85>
mov    -0xb0(%rbp),%rdi
call   1030 <free@plt>
movq   $0x0,-0xb0(%rbp)
add    $0xc0,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<print_trace>:
push   %r15
push   %r14
push   %rbx
sub    $0xa0,%rsp
mov    %rsp,%rbx
mov    %rbx,%rdi
mov    $0x14,%esi
call   1060 <backtrace@plt>
mov    %rax,%r14
mov    %rbx,%rdi
mov    %rax,%rsi
call   1050 <backtrace_symbols@plt>
test   %rax,%rax
je     11e7 <print_trace+0x77>
mov    %rax,%r15
lea    0xe69(%rip),%rdi
mov    %r14,%rsi
xor    %eax,%eax
call   1070 <printf@plt>
test   %r14,%r14
je     11d2 <print_trace+0x62>
xor    %ebx,%ebx
nopw   0x0(%rax,%rax,1)
mov    (%r15,%rbx,8),%rdi
call   1040 <puts@plt>
add    $0x1,%rbx
cmp    %rbx,%r14
jne    11c0 <print_trace+0x50>
mov    %r15,%rdi
call   1030 <free@plt>
add    $0xa0,%rsp
pop    %rbx
pop    %r14
pop    %r15
ret
lea    0xe12(%rip),%rdi
call   1080 <perror@plt>
mov    0x2de6(%rip),%rax
mov    (%rax),%edi
call   1090 <exit@plt>

LLVM IR (-O0):
@.str = [18 x i8] c"backtrace_synbols\00"
@EXIT_FAILURE = global i32 0
@.str.1 = [28 x i8] c"Obtained %zd stack frames.\0A\00"
@.str.2 = [4 x i8] c"%s\0A\00"
define void @print_trace() {
%1 = alloca [20 x i8*]
%2 = alloca i64
%3 = alloca i8**
%4 = alloca i64
%5 = getelementptr inbounds [20 x i8*], [20 x i8*]* %1, i64 0, i64 0
%6 = call i64 @backtrace(i8** %5, i32 20)
store i64 %6, i64* %2
%7 = getelementptr inbounds [20 x i8*], [20 x i8*]* %1, i64 0, i64 0
%8 = load i64, i64* %2
%9 = call i8** @backtrace_symbols(i8** %7, i64 %8)
store i8** %9, i8*** %3
%10 = load i8**, i8*** %3
%11 = icmp eq i8** %10, null
br i1 %11, label %12, label %16
12: ; preds = %0
%13 = call i32 @perror(i8* getelementptr inbounds ([18 x i8], [18 x i8]* @.str, i64 0, i64 0))
%14 = load i32, i32* @EXIT_FAILURE
%15 = call i32 @exit(i32 %14)
unreachable
16: ; preds = %0
%17 = load i64, i64* %2
%18 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([28 x i8], [28 x i8]* @.str.1, i64 0, i64 0), i64 %17)
store i64 0, i64* %4
br label %19
19: ; preds = %29, %16
%20 = load i64, i64* %4
%21 = load i64, i64* %2
%22 = icmp ult i64 %20, %21
br i1 %22, label %23, label %32
23: ; preds = %19
%24 = load i8**, i8*** %3
%25 = load i64, i64* %4
%26 = getelementptr inbounds i8*, i8** %24, i64 %25
%27 = load i8*, i8** %26
%28 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.2, i64 0, i64 0), i8* %27)
br label %29
29: ; preds = %23
%30 = load i64, i64* %4
%31 = add i64 %30, 1
store i64 %31, i64* %4
br label %19
32: ; preds = %19
%33 = load i8**, i8*** %3
%34 = call i32 @free(i8** %33)
store i8** null, i8*** %3
ret void
}

LLVM IR (-O2):
@.str = [18 x i8] c"backtrace_synbols\00"
@EXIT_FAILURE = global i32 0
@.str.1 = [28 x i8] c"Obtained %zd stack frames.\0A\00"
define void @print_trace() {
%1 = alloca [20 x i8*]
%2 = bitcast [20 x i8*]* %1 to i8*
%3 = getelementptr inbounds [20 x i8*], [20 x i8*]* %1, i64 0, i64 0
%4 = call i64 @backtrace(i8** %3, i32 20)
%5 = call i8** @backtrace_symbols(i8** %3, i64 %4)
%6 = icmp eq i8** %5, null
br i1 %6, label %7, label %11
7: ; preds = %0
%8 = call i32 @perror(i8* getelementptr inbounds ([18 x i8], [18 x i8]* @.str, i64 0, i64 0))
%9 = load i32, i32* @EXIT_FAILURE
%10 = call i32 @exit(i32 %9)
unreachable
11: ; preds = %0
%12 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([28 x i8], [28 x i8]* @.str.1, i64 0, i64 0), i64 %4)
%13 = icmp eq i64 %4, 0
br i1 %13, label %21, label %14
14: ; preds = %11, %14
%15 = phi i64 [ %19, %14 ], [ 0, %11 ]
%16 = getelementptr inbounds i8*, i8** %5, i64 %15
%17 = load i8*, i8** %16
%18 = call i32 @puts(i8* dereferenceable(1) %17)
%19 = add nuw i64 %15, 1
%20 = icmp eq i64 %19, %4
br i1 %20, label %21, label %14
21: ; preds = %14, %11
%22 = call i32 @free(i8** %5)
ret void
}