#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 const *, char *);
size_t fread(char *, size_t, int, 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 *read_full_file(const char *filename) {
  FILE *file = fopen(filename, "r");
  if (file == NULL) {
    return NULL;
  }
  fseek(file, 0, SEEK_END);
  size_t len = ftell(file);
  rewind(file);
  char *content = (char *)malloc(len + 1);
  size_t num_read = fread(content, len, 1, file);
  if (num_read != 1) {
    free(content);
    return NULL;
  }
  fclose(file);
  return content;
}


x86 assembly (clang, -O0):
<read_full_file>:
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    11b8 <read_full_file+0x38>
movq   $0x0,-0x8(%rbp)
jmp    123f <read_full_file+0xbf>
mov    -0x18(%rbp),%rdi
mov    0x2e25(%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),%rdi
add    $0x1,%rdi
call   1080 <malloc@plt>
mov    %rax,-0x28(%rbp)
mov    -0x28(%rbp),%rdi
mov    -0x20(%rbp),%rsi
mov    -0x18(%rbp),%rcx
mov    $0x1,%edx
call   1040 <fread@plt>
mov    %rax,-0x30(%rbp)
cmpq   $0x1,-0x30(%rbp)
je     122e <read_full_file+0xae>
mov    -0x28(%rbp),%rdi
call   1030 <free@plt>
movq   $0x0,-0x8(%rbp)
jmp    123f <read_full_file+0xbf>
mov    -0x18(%rbp),%rdi
call   1050 <fclose@plt>
mov    -0x28(%rbp),%rax
mov    %rax,-0x8(%rbp)
mov    -0x8(%rbp),%rax
add    $0x30,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<read_full_file>:
push   %r15
push   %r14
push   %rbx
lea    0xe74(%rip),%rsi
call   10a0 <fopen@plt>
test   %rax,%rax
je     11f6 <read_full_file+0x76>
mov    %rax,%rbx
mov    0x2e48(%rip),%rax
mov    (%rax),%edx
mov    %rbx,%rdi
xor    %esi,%esi
call   1090 <fseek@plt>
mov    %rbx,%rdi
call   1070 <ftell@plt>
mov    %rax,%r15
mov    %rbx,%rdi
call   1060 <rewind@plt>
lea    0x1(%r15),%rdi
call   1080 <malloc@plt>
mov    %rax,%r14
mov    %rax,%rdi
mov    %r15,%rsi
mov    $0x1,%edx
mov    %rbx,%rcx
call   1040 <fread@plt>
cmp    $0x1,%rax
jne    11ee <read_full_file+0x6e>
mov    %rbx,%rdi
call   1050 <fclose@plt>
jmp    11f9 <read_full_file+0x79>
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* @read_full_file(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 %13
12: ; preds = %1
store i8* null, i8** %2
br label %38
13: ; preds = %1
%14 = load i32*, i32** %4
%15 = load i32, i32* @SEEK_END
%16 = call i32 @fseek(i32* %14, i32 0, i32 %15)
%17 = load i32*, i32** %4
%18 = call i64 @ftell(i32* %17)
store i64 %18, i64* %5
%19 = load i32*, i32** %4
%20 = call i32 @rewind(i32* %19)
%21 = load i64, i64* %5
%22 = add i64 %21, 1
%23 = call i64 @malloc(i64 %22)
%24 = inttoptr i64 %23 to i8*
store i8* %24, i8** %6
%25 = load i8*, i8** %6
%26 = load i64, i64* %5
%27 = load i32*, i32** %4
%28 = call i64 @fread(i8* %25, i64 %26, i32 1, i32* %27)
store i64 %28, i64* %7
%29 = load i64, i64* %7
%30 = icmp ne i64 %29, 1
br i1 %30, label %31, label %34
31: ; preds = %13
%32 = load i8*, i8** %6
%33 = call i32 @free(i8* %32)
store i8* null, i8** %2
br label %38
34: ; preds = %13
%35 = load i32*, i32** %4
%36 = call i32 @fclose(i32* %35)
%37 = load i8*, i8** %6
store i8* %37, i8** %2
br label %38
38: ; preds = %34, %31, %12
%39 = load i8*, i8** %2
ret i8* %39
}

LLVM IR (-O2):
@.str = [2 x i8] c"r\00"
@SEEK_END = global i32 0
define i8* @read_full_file(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 %18, 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, i64 %7, i32 1, i32* %2)
%13 = icmp eq i64 %12, 1
br i1 %13, label %16, label %14
14: ; preds = %4
%15 = tail call i32 @free(i8* %11)
br label %18
16: ; preds = %4
%17 = tail call i32 @fclose(i32* %2)
br label %18
18: ; preds = %14, %16, %1
%19 = phi i8* [ null, %1 ], [ null, %14 ], [ %11, %16 ]
ret i8* %19
}