#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*/ fprintf(int /*<<< orphan*/, char *, char const *);
int /*<<< orphan*/ printf(char *, ...);
int /*<<< orphan*/ stderr;
int callback(void *data, int argc, char **argv, char **azColName) {
  int i;
  fprintf(stderr, "%s: ", (const char *)data);
  for (i = 0; i < argc; i++) {
    printf("%s = %s ", azColName[i], argv[i] ? argv[i] : "NULL");
  }
  printf("\n");
  return 0;
}


x86 assembly (clang, -O0):
<callback>:
push   %rbp
mov    %rsp,%rbp
sub    $0x40,%rsp
mov    %rdi,-0x8(%rbp)
mov    %esi,-0xc(%rbp)
mov    %rdx,-0x18(%rbp)
mov    %rcx,-0x20(%rbp)
mov    0x2ea2(%rip),%rax
mov    (%rax),%edi
mov    -0x8(%rbp),%rdx
lea    0xeb5(%rip),%rsi
call   1040 <fprintf@plt>
movl   $0x0,-0x24(%rbp)
mov    -0x24(%rbp),%eax
cmp    -0xc(%rbp),%eax
jge    11cf <callback+0xaf>
mov    -0x20(%rbp),%rax
movslq -0x24(%rbp),%rcx
mov    (%rax,%rcx,8),%rax
mov    %rax,-0x30(%rbp)
mov    -0x18(%rbp),%rax
movslq -0x24(%rbp),%rcx
cmpq   $0x0,(%rax,%rcx,8)
je     119b <callback+0x7b>
mov    -0x18(%rbp),%rax
movslq -0x24(%rbp),%rcx
mov    (%rax,%rcx,8),%rax
mov    %rax,-0x38(%rbp)
jmp    11ab <callback+0x8b>
lea    0xe6c(%rip),%rax
mov    %rax,-0x38(%rbp)
jmp    11ab <callback+0x8b>
mov    -0x30(%rbp),%rsi
mov    -0x38(%rbp),%rdx
lea    0xe4b(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
mov    -0x24(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0x24(%rbp)
jmp    1157 <callback+0x37>
lea    0xe3d(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
xor    %eax,%eax
add    $0x40,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<callback>:
push   %rbp
push   %r15
push   %r14
push   %r13
push   %r12
push   %rbx
push   %rax
mov    %rcx,%r14
mov    %rdx,%r13
mov    %esi,%ebp
mov    %rdi,%rdx
mov    0x2e93(%rip),%rax
mov    (%rax),%edi
lea    0xeaa(%rip),%rsi
call   1050 <fprintf@plt>
test   %ebp,%ebp
jle    11a3 <callback+0x73>
mov    %ebp,%ebp
lea    0xea6(%rip),%r12
lea    0xe96(%rip),%r15
xor    %ebx,%ebx
cs nopw 0x0(%rax,%rax,1)
nopl   0x0(%rax,%rax,1)
mov    (%r14,%rbx,8),%rsi
mov    0x0(%r13,%rbx,8),%rdx
test   %rdx,%rdx
cmove  %r12,%rdx
mov    %r15,%rdi
xor    %eax,%eax
call   1040 <printf@plt>
add    $0x1,%rbx
cmp    %rbx,%rbp
jne    1180 <callback+0x50>
mov    $0xa,%edi
call   1030 <putchar@plt>
xor    %eax,%eax
add    $0x8,%rsp
pop    %rbx
pop    %r12
pop    %r13
pop    %r14
pop    %r15
pop    %rbp
ret

LLVM IR (-O0):
@stderr = global i32 0
@.str = [5 x i8] c"%s: \00"
@.str.1 = [9 x i8] c"%s = %s \00"
@.str.2 = [5 x i8] c"NULL\00"
@.str.3 = [2 x i8] c"\0A\00"
define i32 @callback(i8* %0, i32 %1, i8** %2, i8** %3) {
%5 = alloca i8*
%6 = alloca i32
%7 = alloca i8**
%8 = alloca i8**
%9 = alloca i32
store i8* %0, i8** %5
store i32 %1, i32* %6
store i8** %2, i8*** %7
store i8** %3, i8*** %8
%10 = load i32, i32* @stderr
%11 = load i8*, i8** %5
%12 = call i32 @fprintf(i32 %10, i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str, i64 0, i64 0), i8* %11)
store i32 0, i32* %9
br label %13
13: ; preds = %39, %4
%14 = load i32, i32* %9
%15 = load i32, i32* %6
%16 = icmp slt i32 %14, %15
br i1 %16, label %17, label %42
17: ; preds = %13
%18 = load i8**, i8*** %8
%19 = load i32, i32* %9
%20 = sext i32 %19 to i64
%21 = getelementptr inbounds i8*, i8** %18, i64 %20
%22 = load i8*, i8** %21
%23 = load i8**, i8*** %7
%24 = load i32, i32* %9
%25 = sext i32 %24 to i64
%26 = getelementptr inbounds i8*, i8** %23, i64 %25
%27 = load i8*, i8** %26
%28 = icmp ne i8* %27, null
br i1 %28, label %29, label %35
29: ; preds = %17
%30 = load i8**, i8*** %7
%31 = load i32, i32* %9
%32 = sext i32 %31 to i64
%33 = getelementptr inbounds i8*, i8** %30, i64 %32
%34 = load i8*, i8** %33
br label %36
35: ; preds = %17
br label %36
36: ; preds = %35, %29
%37 = phi i8* [ %34, %29 ], [ getelementptr inbounds ([5 x i8], [5 x i8]* @.str.2, i64 0, i64 0), %35 ]
%38 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([9 x i8], [9 x i8]* @.str.1, i64 0, i64 0), i8* %22, i8* %37)
br label %39
39: ; preds = %36
%40 = load i32, i32* %9
%41 = add nsw i32 %40, 1
store i32 %41, i32* %9
br label %13
42: ; preds = %13
%43 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.3, i64 0, i64 0))
ret i32 0
}

LLVM IR (-O2):
@stderr = global i32 0
@.str = [5 x i8] c"%s: \00"
@.str.1 = [9 x i8] c"%s = %s \00"
@.str.2 = [5 x i8] c"NULL\00"
define i32 @callback(i8* %0, i32 %1, i8** nocapture %2, i8** nocapture %3) {
%5 = load i32, i32* @stderr
%6 = tail call i32 @fprintf(i32 %5, i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str, i64 0, i64 0), i8* %0)
%7 = icmp sgt i32 %1, 0
br i1 %7, label %8, label %21
8: ; preds = %4
%9 = zext i32 %1 to i64
br label %10
10: ; preds = %8, %10
%11 = phi i64 [ 0, %8 ], [ %19, %10 ]
%12 = getelementptr inbounds i8*, i8** %3, i64 %11
%13 = load i8*, i8** %12
%14 = getelementptr inbounds i8*, i8** %2, i64 %11
%15 = load i8*, i8** %14
%16 = icmp eq i8* %15, null
%17 = select i1 %16, i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str.2, i64 0, i64 0), i8* %15
%18 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([9 x i8], [9 x i8]* @.str.1, i64 0, i64 0), i8* %13, i8* %17)
%19 = add nuw nsw i64 %11, 1
%20 = icmp eq i64 %19, %9
br i1 %20, label %21, label %10
21: ; preds = %10, %4
%22 = tail call i32 @putchar(i32 10)
ret i32 0
}