#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*/ exit(int);
int /*<<< orphan*/ fclose(int /*<<< orphan*/ *);
int /*<<< orphan*/ *fopen(char *, char *);
int /*<<< orphan*/ fprintf(int /*<<< orphan*/, char *, char *);
int /*<<< orphan*/ fread(char *, int, long, int /*<<< orphan*/ *);
int /*<<< orphan*/ fseek(int /*<<< orphan*/ *, int /*<<< orphan*/,
                         int /*<<< orphan*/);
long ftell(int /*<<< orphan*/ *);
scalar_t__ malloc(long);
int /*<<< orphan*/ rewind(int /*<<< orphan*/ *);
int /*<<< orphan*/ stderr;
char *readShader(char *filename) {
  FILE *file = fopen(filename, "r");
  if (!file) {
    fprintf(stderr, "Cannot open file %s\n", filename);
    exit(1);
  }
  char *shaderStr;
  long fileLen;
  fseek(file, 0, SEEK_END);
  fileLen = ftell(file);
  rewind(file);
  shaderStr = (char *)malloc((fileLen + 1) * sizeof(char));
  fread(shaderStr, sizeof(char), fileLen, file);
  fclose(file);
  shaderStr[fileLen] = 0;
  return shaderStr;
}


x86 assembly (clang, -O0):
<readShader>:
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 <readShader+0x4e>
mov    0x2e16(%rip),%rax
mov    (%rax),%edi
mov    -0x8(%rbp),%rdx
lea    0xe33(%rip),%rsi
call   1060 <fprintf@plt>
mov    $0x1,%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   1070 <ftell@plt>
mov    %rax,-0x20(%rbp)
mov    -0x10(%rbp),%rdi
call   1050 <rewind@plt>
mov    -0x20(%rbp),%rdi
add    $0x1,%rdi
shl    $0x0,%rdi
call   1080 <malloc@plt>
mov    %rax,-0x18(%rbp)
mov    -0x18(%rbp),%rdi
mov    -0x20(%rbp),%rdx
mov    -0x10(%rbp),%rcx
mov    $0x1,%esi
call   1030 <fread@plt>
mov    -0x10(%rbp),%rdi
call   1040 <fclose@plt>
mov    -0x18(%rbp),%rax
mov    -0x20(%rbp),%rcx
movb   $0x0,(%rax,%rcx,1)
mov    -0x18(%rbp),%rax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<readShader>:
push   %r15
push   %r14
push   %rbx
mov    %rdi,%r14
lea    0xe61(%rip),%rsi
call   10a0 <fopen@plt>
test   %rax,%rax
je     1207 <readShader+0x77>
mov    %rax,%rbx
mov    0x2e35(%rip),%rax
mov    (%rax),%edx
mov    %rbx,%rdi
xor    %esi,%esi
call   1090 <fseek@plt>
mov    %rbx,%rdi
call   1070 <ftell@plt>
mov    %rax,%r14
mov    %rbx,%rdi
call   1050 <rewind@plt>
lea    0x1(%r14),%rdi
call   1080 <malloc@plt>
mov    %rax,%r15
mov    %rax,%rdi
mov    $0x1,%esi
mov    %r14,%rdx
mov    %rbx,%rcx
call   1030 <fread@plt>
mov    %rbx,%rdi
call   1040 <fclose@plt>
movb   $0x0,(%r15,%r14,1)
mov    %r15,%rax
pop    %rbx
pop    %r14
pop    %r15
ret
mov    0x2dca(%rip),%rax
mov    (%rax),%edi
lea    0xdeb(%rip),%rsi
mov    %r14,%rdx
call   1060 <fprintf@plt>
mov    $0x1,%edi
call   10b0 <exit@plt>

LLVM IR (-O0):
@.str = [2 x i8] c"r\00"
@stderr = global i32 0
@.str.1 = [21 x i8] c"Cannot open file %s\0A\00"
@SEEK_END = global i32 0
define i8* @readShader(i8* %0) {
%2 = alloca i8*
%3 = alloca i32*
%4 = alloca i8*
%5 = alloca i64
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 = load i8*, i8** %2
%13 = call i32 @fprintf(i32 %11, i8* getelementptr inbounds ([21 x i8], [21 x i8]* @.str.1, i64 0, i64 0), i8* %12)
%14 = call i32 @exit(i32 1)
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 i64 @ftell(i32* %19)
store i64 %20, i64* %5
%21 = load i32*, i32** %3
%22 = call i32 @rewind(i32* %21)
%23 = load i64, i64* %5
%24 = add nsw i64 %23, 1
%25 = mul i64 %24, 1
%26 = call i64 @malloc(i64 %25)
%27 = inttoptr i64 %26 to i8*
store i8* %27, i8** %4
%28 = load i8*, i8** %4
%29 = load i64, i64* %5
%30 = load i32*, i32** %3
%31 = call i32 @fread(i8* %28, i32 1, i64 %29, i32* %30)
%32 = load i32*, i32** %3
%33 = call i32 @fclose(i32* %32)
%34 = load i8*, i8** %4
%35 = load i64, i64* %5
%36 = getelementptr inbounds i8, i8* %34, i64 %35
store i8 0, i8* %36
%37 = load i8*, i8** %4
ret i8* %37
}

LLVM IR (-O2):
@.str = [2 x i8] c"r\00"
@stderr = global i32 0
@.str.1 = [21 x i8] c"Cannot open file %s\0A\00"
@SEEK_END = global i32 0
define i8* @readShader(i8* %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 %8
4: ; preds = %1
%5 = load i32, i32* @stderr
%6 = tail call i32 @fprintf(i32 %5, i8* getelementptr inbounds ([21 x i8], [21 x i8]* @.str.1, i64 0, i64 0), i8* %0)
%7 = tail call i32 @exit(i32 1)
unreachable
8: ; preds = %1
%9 = load i32, i32* @SEEK_END
%10 = tail call i32 @fseek(i32* %2, i32 0, i32 %9)
%11 = tail call i64 @ftell(i32* %2)
%12 = tail call i32 @rewind(i32* %2)
%13 = add nsw i64 %11, 1
%14 = tail call i64 @malloc(i64 %13)
%15 = inttoptr i64 %14 to i8*
%16 = tail call i32 @fread(i8* %15, i32 1, i64 %11, i32* %2)
%17 = tail call i32 @fclose(i32* %2)
%18 = getelementptr inbounds i8, i8* %15, i64 %11
store i8 0, i8* %18
ret i8* %15
}