#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*/ EXIT_FAILURE;
int /*<<< orphan*/ SEEK_END;
scalar_t__ calloc(int, int);
int /*<<< orphan*/ exit(int /*<<< orphan*/);
int /*<<< orphan*/ fclose(int /*<<< orphan*/ *);
int /*<<< orphan*/ *fopen(char *, char *);
int /*<<< orphan*/ fprintf(int /*<<< orphan*/, char *);
int /*<<< orphan*/ fread(char *, int, int, int /*<<< orphan*/ *);
int /*<<< orphan*/ fseek(int /*<<< orphan*/ *, int /*<<< orphan*/,
                         int /*<<< orphan*/);
int ftell(int /*<<< orphan*/ *);
int /*<<< orphan*/ rewind(int /*<<< orphan*/ *);
int /*<<< orphan*/ stderr;
char *getKernelSource(char *filename) {
  FILE *file = fopen(filename, "r");
  if (!file) {
    fprintf(stderr, "Error, Could not open kernel source file\n");
    exit(EXIT_FAILURE);
  }
  fseek(file, 0, SEEK_END);
  int len = ftell(file) + 1;
  rewind(file);
  char *source = (char *)calloc(sizeof(char), len);
  if (!source) {
    fprintf(stderr, "Error, Could not allocate memory for source string\n");
    exit(EXIT_FAILURE);
  }
  fread(source, sizeof(char), len, file);
  fclose(file);
  return source;
}


x86 assembly (clang, -O0):
<getKernelSource>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
mov    %rdi,-0x8(%rbp)
mov    -0x8(%rbp),%rdi
lea    0xe59(%rip),%rsi
call   10a0 <fopen@plt>
mov    %rax,-0x10(%rbp)
cmpq   $0x0,-0x10(%rbp)
jne    11de <getKernelSource+0x4e>
mov    0x2e16(%rip),%rax
mov    (%rax),%edi
lea    0xe37(%rip),%rsi
call   1070 <fprintf@plt>
mov    0x2df9(%rip),%rax
mov    (%rax),%edi
call   10b0 <exit@plt>
mov    -0x10(%rbp),%rdi
mov    0x2dff(%rip),%rax
mov    (%rax),%edx
xor    %esi,%esi
call   1090 <fseek@plt>
mov    -0x10(%rbp),%rdi
call   1080 <ftell@plt>
add    $0x1,%eax
mov    %eax,-0x14(%rbp)
mov    -0x10(%rbp),%rdi
call   1050 <rewind@plt>
mov    -0x14(%rbp),%esi
mov    $0x1,%edi
call   1060 <calloc@plt>
mov    %rax,-0x20(%rbp)
cmpq   $0x0,-0x20(%rbp)
jne    1249 <getKernelSource+0xb9>
mov    0x2dab(%rip),%rax
mov    (%rax),%edi
lea    0xdf6(%rip),%rsi
call   1070 <fprintf@plt>
mov    0x2d8e(%rip),%rax
mov    (%rax),%edi
call   10b0 <exit@plt>
mov    -0x20(%rbp),%rdi
mov    -0x14(%rbp),%edx
mov    -0x10(%rbp),%rcx
mov    $0x1,%esi
call   1030 <fread@plt>
mov    -0x10(%rbp),%rdi
call   1040 <fclose@plt>
mov    -0x20(%rbp),%rax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<getKernelSource>:
push   %rbp
push   %r14
push   %rbx
lea    0xe65(%rip),%rsi
call   10a0 <fopen@plt>
test   %rax,%rax
je     1206 <getKernelSource+0x76>
mov    %rax,%rbx
mov    0x2e39(%rip),%rax
mov    (%rax),%edx
mov    %rbx,%rdi
xor    %esi,%esi
call   1090 <fseek@plt>
mov    %rbx,%rdi
call   1080 <ftell@plt>
mov    %eax,%ebp
add    $0x1,%ebp
mov    %rbx,%rdi
call   1050 <rewind@plt>
mov    $0x1,%edi
mov    %ebp,%esi
call   1060 <calloc@plt>
test   %rax,%rax
je     1218 <getKernelSource+0x88>
mov    %rax,%r14
mov    %rax,%rdi
mov    $0x1,%esi
mov    %ebp,%edx
mov    %rbx,%rcx
call   1030 <fread@plt>
mov    %rbx,%rdi
call   1040 <fclose@plt>
mov    %r14,%rax
pop    %rbx
pop    %r14
pop    %rbp
ret
mov    0x2dcb(%rip),%rax
mov    (%rax),%edi
lea    0xdec(%rip),%rsi
jmp    1228 <getKernelSource+0x98>
mov    0x2db9(%rip),%rax
mov    (%rax),%edi
lea    0xe04(%rip),%rsi
call   1070 <fprintf@plt>
mov    0x2d9c(%rip),%rax
mov    (%rax),%edi
call   10b0 <exit@plt>

LLVM IR (-O0):
@.str = [2 x i8] c"r\00"
@stderr = global i32 0
@.str.1 = [42 x i8] c"Error, Could not open kernel source file\0A\00"
@EXIT_FAILURE = global i32 0
@SEEK_END = global i32 0
@.str.2 = [52 x i8] c"Error, Could not allocate memory for source string\0A\00"
define i8* @getKernelSource(i8* %0) {
%2 = alloca i8*
%3 = alloca i32*
%4 = alloca i32
%5 = alloca i8*
store i8* %0, i8** %2
%6 = load i8*, i8** %2
%7 = call i32* @fopen(i8* %6, i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str, i64 0, i64 0))
store i32* %7, i32** %3
%8 = load i32*, i32** %3
%9 = icmp ne i32* %8, null
br i1 %9, label %15, label %10
10: ; preds = %1
%11 = load i32, i32* @stderr
%12 = call i32 @fprintf(i32 %11, i8* getelementptr inbounds ([42 x i8], [42 x i8]* @.str.1, i64 0, i64 0))
%13 = load i32, i32* @EXIT_FAILURE
%14 = call i32 @exit(i32 %13)
unreachable
15: ; preds = %1
%16 = load i32*, i32** %3
%17 = load i32, i32* @SEEK_END
%18 = call i32 @fseek(i32* %16, i32 0, i32 %17)
%19 = load i32*, i32** %3
%20 = call i32 @ftell(i32* %19)
%21 = add nsw i32 %20, 1
store i32 %21, i32* %4
%22 = load i32*, i32** %3
%23 = call i32 @rewind(i32* %22)
%24 = load i32, i32* %4
%25 = call i64 @calloc(i32 1, i32 %24)
%26 = inttoptr i64 %25 to i8*
store i8* %26, i8** %5
%27 = load i8*, i8** %5
%28 = icmp ne i8* %27, null
br i1 %28, label %34, label %29
29: ; preds = %15
%30 = load i32, i32* @stderr
%31 = call i32 @fprintf(i32 %30, i8* getelementptr inbounds ([52 x i8], [52 x i8]* @.str.2, i64 0, i64 0))
%32 = load i32, i32* @EXIT_FAILURE
%33 = call i32 @exit(i32 %32)
unreachable
34: ; preds = %15
%35 = load i8*, i8** %5
%36 = load i32, i32* %4
%37 = load i32*, i32** %3
%38 = call i32 @fread(i8* %35, i32 1, i32 %36, i32* %37)
%39 = load i32*, i32** %3
%40 = call i32 @fclose(i32* %39)
%41 = load i8*, i8** %5
ret i8* %41
}

LLVM IR (-O2):
@.str = [2 x i8] c"r\00"
@stderr = global i32 0
@.str.1 = [42 x i8] c"Error, Could not open kernel source file\0A\00"
@EXIT_FAILURE = global i32 0
@SEEK_END = global i32 0
@.str.2 = [52 x i8] c"Error, Could not allocate memory for source string\0A\00"
define i8* @getKernelSource(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 %9
4: ; preds = %1
%5 = load i32, i32* @stderr
%6 = tail call i32 @fprintf(i32 %5, i8* getelementptr inbounds ([42 x i8], [42 x i8]* @.str.1, i64 0, i64 0))
%7 = load i32, i32* @EXIT_FAILURE
%8 = tail call i32 @exit(i32 %7)
unreachable
9: ; preds = %1
%10 = load i32, i32* @SEEK_END
%11 = tail call i32 @fseek(i32* %2, i32 0, i32 %10)
%12 = tail call i32 @ftell(i32* %2)
%13 = add nsw i32 %12, 1
%14 = tail call i32 @rewind(i32* %2)
%15 = tail call i64 @calloc(i32 1, i32 %13)
%16 = inttoptr i64 %15 to i8*
%17 = icmp eq i64 %15, 0
br i1 %17, label %18, label %23
18: ; preds = %9
%19 = load i32, i32* @stderr
%20 = tail call i32 @fprintf(i32 %19, i8* getelementptr inbounds ([52 x i8], [52 x i8]* @.str.2, i64 0, i64 0))
%21 = load i32, i32* @EXIT_FAILURE
%22 = tail call i32 @exit(i32 %21)
unreachable
23: ; preds = %9
%24 = tail call i32 @fread(i8* %16, i32 1, i32 %13, i32* %2)
%25 = tail call i32 @fclose(i32* %2)
ret i8* %16
}