#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;
scalar_t__ feof(int /*<<< orphan*/ *);
int /*<<< orphan*/ *fopen(char *, char *);
size_t fread(void *, int, size_t, int /*<<< orphan*/ *);
int /*<<< orphan*/ free(char *);
int /*<<< orphan*/ fseek(int /*<<< orphan*/ *, int /*<<< orphan*/,
                         int /*<<< orphan*/);
size_t ftell(int /*<<< orphan*/ *);
scalar_t__ malloc(size_t);
int /*<<< orphan*/ rewind(int /*<<< orphan*/ *);
char *ReadFileIntoCString(char *Filename) {
  FILE *File = fopen(Filename, "r");
  if (File != NULL) {
    fseek(File, 0, SEEK_END);
    size_t Size = ftell(File);
    rewind(File);
    char *Memory = (char *)malloc(Size + 1);
    size_t Result = fread((void *)Memory, 1, Size, File);
    Memory[Size] = '\0';
    if (Result == Size || feof(File)) {
      return Memory;
    } else {
      free(Memory);
      return NULL;
    }
  }
  return NULL;
}


x86 assembly (clang, -O0):
<ReadFileIntoCString>:
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)
je     1250 <ReadFileIntoCString+0xd0>
mov    -0x18(%rbp),%rdi
mov    0x2e32(%rip),%rax
mov    (%rax),%edx
xor    %esi,%esi
call   1090 <fseek@plt>
mov    -0x18(%rbp),%rdi
call   1060 <ftell@plt>
mov    %rax,-0x20(%rbp)
mov    -0x18(%rbp),%rdi
call   1050 <rewind@plt>
mov    -0x20(%rbp),%rdi
add    $0x1,%rdi
call   1080 <malloc@plt>
mov    %rax,-0x28(%rbp)
mov    -0x28(%rbp),%rdi
mov    -0x20(%rbp),%rdx
mov    -0x18(%rbp),%rcx
mov    $0x1,%esi
call   1040 <fread@plt>
mov    %rax,-0x30(%rbp)
mov    -0x28(%rbp),%rax
mov    -0x20(%rbp),%rcx
movb   $0x0,(%rax,%rcx,1)
mov    -0x30(%rbp),%rax
cmp    -0x20(%rbp),%rax
je     122d <ReadFileIntoCString+0xad>
mov    -0x18(%rbp),%rdi
call   1070 <feof@plt>
cmp    $0x0,%rax
je     123a <ReadFileIntoCString+0xba>
mov    -0x28(%rbp),%rax
mov    %rax,-0x8(%rbp)
jmp    1258 <ReadFileIntoCString+0xd8>
mov    -0x28(%rbp),%rdi
call   1030 <free@plt>
movq   $0x0,-0x8(%rbp)
jmp    1258 <ReadFileIntoCString+0xd8>
movq   $0x0,-0x8(%rbp)
mov    -0x8(%rbp),%rax
add    $0x30,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<ReadFileIntoCString>:
push   %r15
push   %r14
push   %rbx
lea    0xe74(%rip),%rsi
call   10a0 <fopen@plt>
test   %rax,%rax
je     11fd <ReadFileIntoCString+0x7d>
mov    %rax,%r15
mov    0x2e48(%rip),%rax
mov    (%rax),%edx
mov    %r15,%rdi
xor    %esi,%esi
call   1090 <fseek@plt>
mov    %r15,%rdi
call   1060 <ftell@plt>
mov    %rax,%rbx
mov    %r15,%rdi
call   1050 <rewind@plt>
lea    0x1(%rbx),%rdi
call   1080 <malloc@plt>
mov    %rax,%r14
mov    %rax,%rdi
mov    $0x1,%esi
mov    %rbx,%rdx
mov    %r15,%rcx
call   1040 <fread@plt>
movb   $0x0,(%r14,%rbx,1)
cmp    %rbx,%rax
je     1200 <ReadFileIntoCString+0x80>
mov    %r15,%rdi
call   1070 <feof@plt>
test   %rax,%rax
jne    1200 <ReadFileIntoCString+0x80>
mov    %r14,%rdi
call   1030 <free@plt>
xor    %r14d,%r14d
mov    %r14,%rax
pop    %rbx
pop    %r14
pop    %r15
ret

LLVM IR (-O0):
@.str = [2 x i8] c"r\00"
@SEEK_END = global i32 0
define i8* @ReadFileIntoCString(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 ne i32* %10, null
br i1 %11, label %12, label %43
12: ; preds = %1
%13 = load i32*, i32** %4
%14 = load i32, i32* @SEEK_END
%15 = call i32 @fseek(i32* %13, i32 0, i32 %14)
%16 = load i32*, i32** %4
%17 = call i64 @ftell(i32* %16)
store i64 %17, i64* %5
%18 = load i32*, i32** %4
%19 = call i32 @rewind(i32* %18)
%20 = load i64, i64* %5
%21 = add i64 %20, 1
%22 = call i64 @malloc(i64 %21)
%23 = inttoptr i64 %22 to i8*
store i8* %23, i8** %6
%24 = load i8*, i8** %6
%25 = load i64, i64* %5
%26 = load i32*, i32** %4
%27 = call i64 @fread(i8* %24, i32 1, i64 %25, i32* %26)
store i64 %27, i64* %7
%28 = load i8*, i8** %6
%29 = load i64, i64* %5
%30 = getelementptr inbounds i8, i8* %28, i64 %29
store i8 0, i8* %30
%31 = load i64, i64* %7
%32 = load i64, i64* %5
%33 = icmp eq i64 %31, %32
br i1 %33, label %38, label %34
34: ; preds = %12
%35 = load i32*, i32** %4
%36 = call i64 @feof(i32* %35)
%37 = icmp ne i64 %36, 0
br i1 %37, label %38, label %40
38: ; preds = %34, %12
%39 = load i8*, i8** %6
store i8* %39, i8** %2
br label %44
40: ; preds = %34
%41 = load i8*, i8** %6
%42 = call i32 @free(i8* %41)
store i8* null, i8** %2
br label %44
43: ; preds = %1
store i8* null, i8** %2
br label %44
44: ; preds = %43, %40, %38
%45 = load i8*, i8** %2
ret i8* %45
}

LLVM IR (-O2):
@.str = [2 x i8] c"r\00"
@SEEK_END = global i32 0
define i8* @ReadFileIntoCString(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 %20, label %4
4: ; preds = %1
%5 = load i32, i32* @SEEK_END
%6 = tail call i32 @fseek(i32* %2, i32 0, i32 %5)
%7 = tail call i64 @ftell(i32* %2)
%8 = tail call i32 @rewind(i32* %2)
%9 = add i64 %7, 1
%10 = tail call i64 @malloc(i64 %9)
%11 = inttoptr i64 %10 to i8*
%12 = tail call i64 @fread(i8* %11, i32 1, i64 %7, i32* %2)
%13 = getelementptr inbounds i8, i8* %11, i64 %7
store i8 0, i8* %13
%14 = icmp eq i64 %12, %7
br i1 %14, label %20, label %15
15: ; preds = %4
%16 = tail call i64 @feof(i32* %2)
%17 = icmp eq i64 %16, 0
br i1 %17, label %18, label %20
18: ; preds = %15
%19 = tail call i32 @free(i8* %11)
br label %20
20: ; preds = %1, %18, %15, %4
%21 = phi i8* [ null, %18 ], [ %11, %15 ], [ %11, %4 ], [ null, %1 ]
ret i8* %21
}