#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*/ FILE;

/* Variables and functions */
int /*<<< orphan*/ SEEK_END;
int /*<<< orphan*/ fclose(int /*<<< orphan*/ *);
int /*<<< orphan*/ *fopen(char *, char *);
size_t fread(char *, int, long, int /*<<< orphan*/ *);
int /*<<< orphan*/ fseek(int /*<<< orphan*/ *, int /*<<< orphan*/,
                         int /*<<< orphan*/);
long ftell(int /*<<< orphan*/ *);
char *malloc(int);
int /*<<< orphan*/ printf(char *);
int /*<<< orphan*/ rewind(int /*<<< orphan*/ *);
char *readFile(char *fileName) {
  FILE *fp;
  fp = fopen(fileName, "r");
  if (fp == NULL) {
    printf("Error 1!\n");
    return NULL;
  }
  fseek(fp, 0, SEEK_END);
  long size = ftell(fp);
  rewind(fp);
  char *buffer = malloc(sizeof(char) * (size + 1));
  if (buffer == NULL) {
    printf("Error 2!\n");
    fclose(fp);
    return NULL;
  }
  size_t res = fread(buffer, 1, size, fp);
  if (res != size) {
    printf("Error 3!\n");
    fclose(fp);
    return NULL;
  }
  buffer[size] = 0;
  fclose(fp);
  return buffer;
}


x86 assembly (clang, -O0):
<readFile>:
push   %rbp
mov    %rsp,%rbp
sub    $0x30,%rsp
mov    %rdi,-0x10(%rbp)
mov    -0x10(%rbp),%rdi
lea    0xe69(%rip),%rsi
call   10a0 <fopen@plt>
mov    %rax,-0x18(%rbp)
cmpq   $0x0,-0x18(%rbp)
jne    11c4 <readFile+0x44>
lea    0xe50(%rip),%rdi
call   1050 <printf@plt>
movq   $0x0,-0x8(%rbp)
jmp    1299 <readFile+0x119>
mov    -0x18(%rbp),%rdi
mov    0x2e19(%rip),%rax
mov    (%rax),%edx
xor    %esi,%esi
call   1090 <fseek@plt>
mov    -0x18(%rbp),%rdi
call   1070 <ftell@plt>
mov    %rax,-0x20(%rbp)
mov    -0x18(%rbp),%rdi
call   1060 <rewind@plt>
mov    -0x20(%rbp),%rax
add    $0x1,%rax
shl    $0x0,%rax
mov    %eax,%edi
call   1080 <malloc@plt>
mov    %rax,-0x28(%rbp)
cmpq   $0x0,-0x28(%rbp)
jne    1232 <readFile+0xb2>
lea    0xdf5(%rip),%rdi
call   1050 <printf@plt>
mov    -0x18(%rbp),%rdi
call   1040 <fclose@plt>
movq   $0x0,-0x8(%rbp)
jmp    1299 <readFile+0x119>
mov    -0x28(%rbp),%rdi
mov    -0x20(%rbp),%rdx
mov    -0x18(%rbp),%rcx
mov    $0x1,%esi
call   1030 <fread@plt>
mov    %rax,-0x30(%rbp)
mov    -0x30(%rbp),%rax
cmp    -0x20(%rbp),%rax
je     127c <readFile+0xfc>
lea    0xdb5(%rip),%rdi
call   1050 <printf@plt>
mov    -0x18(%rbp),%rdi
call   1040 <fclose@plt>
movq   $0x0,-0x8(%rbp)
jmp    1299 <readFile+0x119>
mov    -0x28(%rbp),%rax
mov    -0x20(%rbp),%rcx
movb   $0x0,(%rax,%rcx,1)
mov    -0x18(%rbp),%rdi
call   1040 <fclose@plt>
mov    -0x28(%rbp),%rax
mov    %rax,-0x8(%rbp)
mov    -0x8(%rbp),%rax
add    $0x30,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<readFile>:
push   %r15
push   %r14
push   %rbx
lea    0xe74(%rip),%rsi
call   10a0 <fopen@plt>
test   %rax,%rax
je     11f7 <readFile+0x77>
mov    %rax,%r14
mov    0x2e48(%rip),%rax
mov    (%rax),%edx
mov    %r14,%rdi
xor    %esi,%esi
call   1090 <fseek@plt>
mov    %r14,%rdi
call   1070 <ftell@plt>
mov    %rax,%r15
mov    %r14,%rdi
call   1060 <rewind@plt>
lea    0x1(%r15),%edi
call   1080 <malloc@plt>
test   %rax,%rax
je     1205 <readFile+0x85>
mov    %rax,%rbx
mov    %rax,%rdi
mov    $0x1,%esi
mov    %r15,%rdx
mov    %r14,%rcx
call   1040 <fread@plt>
cmp    %r15,%rax
jne    120e <readFile+0x8e>
movb   $0x0,(%rbx,%r15,1)
mov    %r14,%rdi
call   1050 <fclose@plt>
jmp    1224 <readFile+0xa4>
lea    0xe16(%rip),%rdi
call   1030 <puts@plt>
jmp    1222 <readFile+0xa2>
lea    0xdff(%rip),%rdi
jmp    1215 <readFile+0x95>
lea    0xded(%rip),%rdi
call   1030 <puts@plt>
mov    %r14,%rdi
call   1050 <fclose@plt>
xor    %ebx,%ebx
mov    %rbx,%rax
pop    %rbx
pop    %r14
pop    %r15
ret

LLVM IR (-O0):
@.str = [2 x i8] c"r\00"
@.str.1 = [10 x i8] c"Error 1!\0A\00"
@SEEK_END = global i32 0
@.str.2 = [10 x i8] c"Error 2!\0A\00"
@.str.3 = [10 x i8] c"Error 3!\0A\00"
define i8* @readFile(i8* %0) {
%2 = alloca i8*
%3 = alloca i8*
%4 = alloca i32*
%5 = alloca i64
%6 = alloca i8*
%7 = alloca i64
store i8* %0, i8** %3
%8 = load i8*, i8** %3
%9 = call i32* @fopen(i8* %8, i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str, i64 0, i64 0))
store i32* %9, i32** %4
%10 = load i32*, i32** %4
%11 = icmp eq i32* %10, null
br i1 %11, label %12, label %14
12: ; preds = %1
%13 = call i32 @printf(i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.1, i64 0, i64 0))
store i8* null, i8** %2
br label %52
14: ; preds = %1
%15 = load i32*, i32** %4
%16 = load i32, i32* @SEEK_END
%17 = call i32 @fseek(i32* %15, i32 0, i32 %16)
%18 = load i32*, i32** %4
%19 = call i64 @ftell(i32* %18)
store i64 %19, i64* %5
%20 = load i32*, i32** %4
%21 = call i32 @rewind(i32* %20)
%22 = load i64, i64* %5
%23 = add nsw i64 %22, 1
%24 = mul i64 1, %23
%25 = trunc i64 %24 to i32
%26 = call i8* @malloc(i32 %25)
store i8* %26, i8** %6
%27 = load i8*, i8** %6
%28 = icmp eq i8* %27, null
br i1 %28, label %29, label %33
29: ; preds = %14
%30 = call i32 @printf(i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.2, i64 0, i64 0))
%31 = load i32*, i32** %4
%32 = call i32 @fclose(i32* %31)
store i8* null, i8** %2
br label %52
33: ; preds = %14
%34 = load i8*, i8** %6
%35 = load i64, i64* %5
%36 = load i32*, i32** %4
%37 = call i64 @fread(i8* %34, i32 1, i64 %35, i32* %36)
store i64 %37, i64* %7
%38 = load i64, i64* %7
%39 = load i64, i64* %5
%40 = icmp ne i64 %38, %39
br i1 %40, label %41, label %45
41: ; preds = %33
%42 = call i32 @printf(i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.3, i64 0, i64 0))
%43 = load i32*, i32** %4
%44 = call i32 @fclose(i32* %43)
store i8* null, i8** %2
br label %52
45: ; preds = %33
%46 = load i8*, i8** %6
%47 = load i64, i64* %5
%48 = getelementptr inbounds i8, i8* %46, i64 %47
store i8 0, i8* %48
%49 = load i32*, i32** %4
%50 = call i32 @fclose(i32* %49)
%51 = load i8*, i8** %6
store i8* %51, i8** %2
br label %52
52: ; preds = %45, %41, %29, %12
%53 = load i8*, i8** %2
ret i8* %53
}

LLVM IR (-O2):
@.str = [2 x i8] c"r\00"
@SEEK_END = global i32 0
@str = [9 x i8] c"Error 3!\00"
@str.4 = [9 x i8] c"Error 2!\00"
@str.5 = [9 x i8] c"Error 1!\00"
define noalias i8* @readFile(i8* nocapture %0) {
%2 = tail call i32* @fopen(i8* %0, i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str, i64 0, i64 0))
%3 = icmp eq i32* %2, null
br i1 %3, label %4, label %6
4: ; preds = %1
%5 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([9 x i8], [9 x i8]* @str.5, i64 0, i64 0))
br label %27
6: ; preds = %1
%7 = load i32, i32* @SEEK_END
%8 = tail call i32 @fseek(i32* %2, i32 0, i32 %7)
%9 = tail call i64 @ftell(i32* %2)
%10 = tail call i32 @rewind(i32* %2)
%11 = trunc i64 %9 to i32
%12 = add i32 %11, 1
%13 = tail call i8* @malloc(i32 %12)
%14 = icmp eq i8* %13, null
br i1 %14, label %15, label %18
15: ; preds = %6
%16 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([9 x i8], [9 x i8]* @str.4, i64 0, i64 0))
%17 = tail call i32 @fclose(i32* %2)
br label %27
18: ; preds = %6
%19 = tail call i64 @fread(i8* %13, i32 1, i64 %9, i32* %2)
%20 = icmp eq i64 %19, %9
br i1 %20, label %24, label %21
21: ; preds = %18
%22 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([9 x i8], [9 x i8]* @str, i64 0, i64 0))
%23 = tail call i32 @fclose(i32* %2)
br label %27
24: ; preds = %18
%25 = getelementptr inbounds i8, i8* %13, i64 %9
store i8 0, i8* %25
%26 = tail call i32 @fclose(i32* %2)
br label %27
27: ; preds = %15, %24, %21, %4
%28 = phi i8* [ null, %4 ], [ null, %15 ], [ null, %21 ], [ %13, %24 ]
ret i8* %28
}