tinyc/win32/include/sys/stat.h


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/**
 * This file has no copyright assigned and is placed in the Public Domain.
 * This file is part of the w64 mingw-runtime package.
 * No warranty is given; refer to the file DISCLAIMER within this package.
 */
#ifndef _INC_STAT
#define _INC_STAT

#ifndef _WIN32
#error Only Win32 target is supported!
#endif

#include <_mingw.h>
#include <io.h>

#pragma pack(push,_CRT_PACKING)

#ifdef __cplusplus
extern "C" {
#endif

#ifndef _CRTIMP
#define _CRTIMP __declspec(dllimport)
#endif

#include <sys/types.h>

#ifndef __TINYC__ /* gr */
#ifdef _USE_32BIT_TIME_T
#ifdef _WIN64
#undef _USE_32BIT_TIME_T
#endif
#else
#if _INTEGRAL_MAX_BITS < 64
#define _USE_32BIT_TIME_T
#endif
#endif
#endif

#ifndef _TIME32_T_DEFINED
  typedef long __time32_t;
#define _TIME32_T_DEFINED
#endif

#ifndef _TIME64_T_DEFINED
#if _INTEGRAL_MAX_BITS >= 64
  typedef __int64 __time64_t;
#endif
#define _TIME64_T_DEFINED
#endif

#ifndef _TIME_T_DEFINED
#ifdef _USE_32BIT_TIME_T
  typedef __time32_t time_t;
#else
  typedef __time64_t time_t;
#endif
#define _TIME_T_DEFINED
#endif

#ifndef _WCHAR_T_DEFINED
  typedef unsigned short wchar_t;
#define _WCHAR_T_DEFINED
#endif

#ifndef _STAT_DEFINED

#ifdef _USE_32BIT_TIME_T
#ifndef _WIN64
#define _fstat32 _fstat
#define _stat32 _stat
#define _wstat32 _wstat
#else
#define _fstat _fstat32
#define _stat _stat32
#define _wstat _wstat32
#endif
#define _fstati64 _fstat32i64
#define _stati64 _stat32i64
#define _wstati64 _wstat32i64
#else
#define _fstat _fstat64i32
#define _fstati64 _fstat64
#define _stat _stat64i32
#define _stati64 _stat64
#define _wstat _wstat64i32
#define _wstati64 _wstat64
#endif

  struct _stat32 {
    _dev_t st_dev;
    _ino_t st_ino;
    unsigned short st_mode;
    short st_nlink;
    short st_uid;
    short st_gid;
    _dev_t st_rdev;
    _off_t st_size;
    __time32_t st_atime;
    __time32_t st_mtime;
    __time32_t st_ctime;
  };

#ifndef	NO_OLDNAMES
  struct stat {
    _dev_t st_dev;
    _ino_t st_ino;
    unsigned short st_mode;
    short st_nlink;
    short st_uid;
    short st_gid;
    _dev_t st_rdev;
    _off_t st_size;
    time_t st_atime;
    time_t st_mtime;
    time_t st_ctime;
  };
#endif

#if _INTEGRAL_MAX_BITS >= 64
  struct _stat32i64 {
    _dev_t st_dev;
    _ino_t st_ino;
    unsigned short st_mode;
    short st_nlink;
    short st_uid;
    short st_gid;
    _dev_t st_rdev;
    __int64 st_size;
    __time32_t st_atime;
    __time32_t st_mtime;
    __time32_t st_ctime;
  };

  struct _stat64i32 {
    _dev_t st_dev;
    _ino_t st_ino;
    unsigned short st_mode;
    short st_nlink;
    short st_uid;
    short st_gid;
    _dev_t st_rdev;
    _off_t st_size;
    __time64_t st_atime;
    __time64_t st_mtime;
    __time64_t st_ctime;
  };

  struct _stat64 {
    _dev_t st_dev;
    _ino_t st_ino;
    unsigned short st_mode;
    short st_nlink;
    short st_uid;
    short st_gid;
    _dev_t st_rdev;
    __int64 st_size;
    __time64_t st_atime;
    __time64_t st_mtime;
    __time64_t st_ctime;
  };
#endif

#define __stat64 _stat64

#define _STAT_DEFINED
#endif

#define _S_IFMT 0xF000
#define _S_IFDIR 0x4000
#define _S_IFCHR 0x2000
#define _S_IFIFO 0x1000
#define _S_IFREG 0x8000
#define _S_IREAD 0x0100
#define _S_IWRITE 0x0080
#define _S_IEXEC 0x0040

  _CRTIMP int __cdecl _fstat32(int _FileDes,struct _stat32 *_Stat);
  _CRTIMP int __cdecl _stat32(const char *_Name,struct _stat32 *_Stat);
#if _INTEGRAL_MAX_BITS >= 64
  _CRTIMP int __cdecl _fstat64(int _FileDes,struct _stat64 *_Stat);
  _CRTIMP int __cdecl _fstat32i64(int _FileDes,struct _stat32i64 *_Stat);
  int __cdecl _fstat64i32(int _FileDes,struct _stat64i32 *_Stat);
  __CRT_INLINE int __cdecl _fstat64i32(int _FileDes,struct _stat64i32 *_Stat)
  {
    struct _stat64 st;
    int ret=_fstat64(_FileDes,&st);
    _Stat->st_dev=st.st_dev;
    _Stat->st_ino=st.st_ino;
    _Stat->st_mode=st.st_mode;
    _Stat->st_nlink=st.st_nlink;
    _Stat->st_uid=st.st_uid;
    _Stat->st_gid=st.st_gid;
    _Stat->st_rdev=st.st_rdev;
    _Stat->st_size=(_off_t) st.st_size;
    _Stat->st_atime=st.st_atime;
    _Stat->st_mtime=st.st_mtime;
    _Stat->st_ctime=st.st_ctime;
    return ret;
  }
  _CRTIMP int __cdecl _stat64(const char *_Name,struct _stat64 *_Stat);
  _CRTIMP int __cdecl _stat32i64(const char *_Name,struct _stat32i64 *_Stat);
  int __cdecl _stat64i32(const char *_Name,struct _stat64i32 *_Stat);
  __CRT_INLINE int __cdecl _stat64i32(const char *_Name,struct _stat64i32 *_Stat)
  {
    struct _stat64 st;
    int ret=_stat64(_Name,&st);
    _Stat->st_dev=st.st_dev;
    _Stat->st_ino=st.st_ino;
    _Stat->st_mode=st.st_mode;
    _Stat->st_nlink=st.st_nlink;
    _Stat->st_uid=st.st_uid;
    _Stat->st_gid=st.st_gid;
    _Stat->st_rdev=st.st_rdev;
    _Stat->st_size=(_off_t) st.st_size;
    _Stat->st_atime=st.st_atime;
    _Stat->st_mtime=st.st_mtime;
    _Stat->st_ctime=st.st_ctime;
    return ret;
  }
#endif

#ifndef _WSTAT_DEFINED
#define _WSTAT_DEFINED
  _CRTIMP int __cdecl _wstat32(const wchar_t *_Name,struct _stat32 *_Stat);
#if _INTEGRAL_MAX_BITS >= 64
  _CRTIMP int __cdecl _wstat32i64(const wchar_t *_Name,struct _stat32i64 *_Stat);
  int __cdecl _wstat64i32(const wchar_t *_Name,struct _stat64i32 *_Stat);
  _CRTIMP int __cdecl _wstat64(const wchar_t *_Name,struct _stat64 *_Stat);
#endif
#endif

#ifndef	NO_OLDNAMES
#define	_S_IFBLK	0x3000	/* Block: Is this ever set under w32? */

#define S_IFMT _S_IFMT
#define S_IFDIR _S_IFDIR
#define S_IFCHR _S_IFCHR
#define S_IFREG _S_IFREG
#define S_IREAD _S_IREAD
#define S_IWRITE _S_IWRITE
#define S_IEXEC _S_IEXEC
#define	S_IFIFO		_S_IFIFO
#define	S_IFBLK		_S_IFBLK

#define	_S_IRWXU	(_S_IREAD | _S_IWRITE | _S_IEXEC)
#define	_S_IXUSR	_S_IEXEC
#define	_S_IWUSR	_S_IWRITE

#define	S_IRWXU		_S_IRWXU
#define	S_IXUSR		_S_IXUSR
#define	S_IWUSR		_S_IWUSR
#define	S_IRUSR		_S_IRUSR
#define	_S_IRUSR	_S_IREAD

#define	S_ISDIR(m)	(((m) & S_IFMT) == S_IFDIR)
#define	S_ISFIFO(m)	(((m) & S_IFMT) == S_IFIFO)
#define	S_ISCHR(m)	(((m) & S_IFMT) == S_IFCHR)
#define	S_ISBLK(m)	(((m) & S_IFMT) == S_IFBLK)
#define	S_ISREG(m)	(((m) & S_IFMT) == S_IFREG)

#endif

#if !defined (RC_INVOKED) && !defined (NO_OLDNAMES)
int __cdecl stat(const char *_Filename,struct stat *_Stat);
int __cdecl fstat(int _Desc,struct stat *_Stat);
int __cdecl wstat(const wchar_t *_Filename,struct stat *_Stat);
#ifdef _USE_32BIT_TIME_T
__CRT_INLINE int __cdecl fstat(int _Desc,struct stat *_Stat) {
  return _fstat32(_Desc,(struct _stat32 *)_Stat);
}
__CRT_INLINE int __cdecl stat(const char *_Filename,struct stat *_Stat) {
  return _stat32(_Filename,(struct _stat32 *)_Stat);
}
#else
__CRT_INLINE int __cdecl fstat(int _Desc,struct stat *_Stat) {
  return _fstat64i32(_Desc,(struct _stat64i32 *)_Stat);
}
__CRT_INLINE int __cdecl stat(const char *_Filename,struct stat *_Stat) {
  return _stat64i32(_Filename,(struct _stat64i32 *)_Stat);
}
#endif
#endif

#ifdef __cplusplus
}
#endif

#pragma pack(pop)
#endif
//: Running SubX programs on the VM.

//: (Not to be confused with the 'run' subcommand for running ELF binaries on
//: the VM. That comes later.)

:(before "End Help Texts")
put_new(Help, "syntax",
  "SubX programs consist of segments, each segment in turn consisting of lines.\n"
  "Line-endings are significant; each line should contain a single\n"
  "instruction, macro or directive.\n"
  "\n"
  "Comments start with the '#' character. It should be at the start of a word\n"
  "(start of line, or following a space).\n"
  "\n"
  "Each segment starts with a header line: a '==' delimiter followed by the name of\n"
  "the segment and a (sometimes approximate) starting address in memory.\n"
  "The name 'code' is special; instructions to execute should always go here.\n"
  "\n"
  "The resulting binary starts running from the start of the segment by default.\n"
  "To start elsewhere in the code segment, define a special label called 'Entry'.\n"
  "\n"
  "Segments with the same name get merged together. This rule helps keep functions and\n"
  "their data close together in .subx files.\n"
  "You don't have to specify the starting address after the first time.\n"
  "\n"
  "Lines consist of a series of words. Words can contain arbitrary metadata\n"
  "after a '/', but they can never contain whitespace. Metadata has no effect\n"
  "at runtime, but can be handy when rewriting macros.\n"
  "\n"
  "Check out the examples in the examples/ directory.\n"
  "Programming in machine code can be annoying, but let's see if we can make\n"
  "it nice enough to be able to write a compiler in it.\n"
);
:(before "End Help Contents")
cerr << "  syntax\n";

:(code)
void test_copy_imm32_to_EAX() {
  // At the lowest level, SubX programs are a series of hex bytes, each
  // (variable-length) instruction on one line.
  run(
      // Comments start with '#' and are ignored.
      "# comment\n"
      // Segment headers start with '==', a name and a starting hex address.
      // There's usually one code and one data segment. The code segment
      // always comes first.
      "== code 0x1\n"  // code segment

      // After the header, each segment consists of lines, and each line
      // consists of words separated by whitespace.
      //
      // All words can have metadata after a '/'. No spaces allowed in
      // metadata, of course.
      // Unrecognized metadata never causes errors, so you can use it for
      // documentation.
      //
      // Within the code segment in particular, x86 instructions consist of
      // some number of the following parts and sub-parts (see the Readme and
      // cheatsheet.pdf for details):
      //   opcodes: 1-3 bytes
      //   ModR/M byte
      //   SIB byte
      //   displacement: 0/1/2/4 bytes
      //   immediate: 0/1/2/4 bytes
      // opcode        ModR/M                    SIB                   displacement    immediate
      // instruction   mod, reg, Reg/Mem bits    scale, index, base
      // 1-3 bytes     0/1 byte                  0/1 byte              0/1/2/4 bytes   0/1/2/4 bytes
      "  b8            .                         .                     .               0a 0b 0c 0d\n"  // copy 0x0d0c0b0a to EAX
      // The periods are just to help the eye track long gaps between columns,
      // and are otherwise ignored.
  );
  // This program, when run, causes the following events in the trace:
  CHECK_TRACE_CONTENTS(
      "load: 0x00000001 -> b8\n"
      "load: 0x00000002 -> 0a\n"
      "load: 0x00000003 -> 0b\n"
      "load: 0x00000004 -> 0c\n"
      "load: 0x00000005 -> 0d\n"
      "run: copy imm32 0x0d0c0b0a to EAX\n"
  );
}

// top-level helper for scenarios: parse the input, transform any macros, load
// the final hex bytes into memory, run it
void run(const string& text_bytes) {
  program p;
  istringstream in(text_bytes);
  parse(in, p);
  if (trace_contains_errors()) return;  // if any stage raises errors, stop immediately
  transform(p);
  if (trace_contains_errors()) return;
  load(p);
  if (trace_contains_errors()) return;
  while (EIP < End_of_program)
    run_one_instruction();
}

//:: core data structures

:(before "End Types")
struct program {
  vector<segment> segments;
  // random ideas for other things we may eventually need
  //map<name, address> globals;
  //vector<recipe> recipes;
  //map<string, type_info> types;
};
:(before "struct program")
struct segment {
  string name;
  uint32_t start;
  vector<line> lines;
  // End segment Fields
  segment() {
    start = 0;
    // End segment Constructor
  }
};
:(before "struct segment")
struct line {
  vector<word> words;
  vector<string> metadata;
  string original;
};
:(before "struct line")
struct word {
  string original;
  string data;
  vector<string> metadata;
};

//:: parse

:(code)
void parse(istream& fin, program& out) {
  segment* curr_segment = NULL;
  vector<line> l;
  while (has_data(fin)) {
    string line_data;
    line curr;
    getline(fin, line_data);
    curr.original = line_data;
    trace(99, "parse") << "line: " << line_data << end();
    // End Line Parsing Special-cases(line_data -> l)
    istringstream lin(line_data);
    while (has_data(lin)) {
      string word_data;
      lin >> word_data;
      if (word_data.empty()) continue;
      if (word_data[0] == '#') break;  // comment
      if (word_data == ".") continue;  // comment token
      if (word_data == "==") {
        flush(curr_segment, l);
        string segment_name;
        lin >> segment_name;
        curr_segment = find(out, segment_name);
        if (curr_segment != NULL) {
          trace(3, "parse") << "appending to segment '" << segment_name << "'" << end();
        }
        else {
          trace(3, "parse") << "new segment '" << segment_name << "'" << end();
          uint32_t seg_start = 0;
          lin >> std::hex >> seg_start;
          sanity_check_program_segment(out, seg_start);
          out.segments.push_back(segment());
          curr_segment = &out.segments.back();
          curr_segment->name = segment_name;
          curr_segment->start = seg_start;
          if (trace_contains_errors()) continue;
          trace(3, "parse") << "starts at address 0x" << HEXWORD << curr_segment->start << end();
        }
        break;  // skip rest of line
      }
      if (word_data[0] == ':') {
        // todo: line metadata
        break;
      }
      curr.words.push_back(word());
      parse_word(word_data, curr.words.back());
      trace(99, "parse") << "word: " << to_string(curr.words.back());
    }
    if (!curr.words.empty())
      l.push_back(curr);
  }
  flush(curr_segment, l);
  trace(99, "parse") << "done" << end();
}

segment* find(program& p, const string& segment_name) {
  for (int i = 0;  i < SIZE(p.segments);  ++i) {
    if (p.segments.at(i).name == segment_name)
      return &p.segments.at(i);
  }
  return NULL;
}

void flush(segment* s, vector<line>& lines) {
  if (lines.empty()) return;
  if (s == NULL) {
    raise << "input does not start with a '==' section header\n" << end();
    return;
  }
  trace(3, "parse") << "flushing segment" << end();
  s->lines.insert(s->lines.end(), lines.begin(), lines.end());
  lines.clear();
}

void parse_word(const string& data, word& out) {
  out.original = data;
  istringstream win(data);
  if (getline(win, out.data, '/')) {
    string m;
    while (getline(win, m, '/'))
      out.metadata.push_back(m);
  }
}

void sanity_check_program_segment(const program& p, uint32_t addr) {
  for (int i = 0;  i < SIZE(p.segments);  ++i) {
    if (p.segments.at(i).start == addr)
      raise << "can't have multiple segments starting at address 0x" << HEXWORD << addr << '\n' << end();
  }
}

// helper for tests
void parse(const string& text_bytes) {
  program p;
  istringstream in(text_bytes);
  parse(in, p);
}

void test_detect_duplicate_segments() {
  Hide_errors = true;
  parse(
      "== segment1 0xee\n"
      "ab\n"
      "== segment2 0xee\n"
      "cd\n"
  );
  CHECK_TRACE_CONTENTS(
      "error: can't have multiple segments starting at address 0x000000ee\n"
  );
}

//:: transform

:(before "End Types")
typedef void (*transform_fn)(program&);
:(before "End Globals")
vector<transform_fn> Transform;

:(code)
void transform(program& p) {
  for (int t = 0;  t < SIZE(Transform);  ++t)
    (*Transform.at(t))(p);
}

//:: load

void load(const program& p) {
  if (find(p, "code") == NULL) {
    raise << "no code to run\n" << end();
    return;
  }
  // Ensure segments are disjoint.
  set<uint32_t> overlap;
  for (int i = 0;   i < SIZE(p.segments);  ++i) {
    const segment& seg = p.segments.at(i);
    uint32_t addr = seg.start;
    if (!already_allocated(addr))
      Mem.push_back(vma(seg.start));
    trace(99, "load") << "loading segment " << i << " from " << HEXWORD << addr << end();
    for (int j = 0;  j < SIZE(seg.lines);  ++j) {
      const line& l = seg.lines.at(j);
      for (int k = 0;  k < SIZE(l.words);  ++k) {
        const word& w = l.words.at(k);
        uint8_t val = hex_byte(w.data);
        if (trace_contains_errors()) return;
        assert(overlap.find(addr) == overlap.end());
        write_mem_u8(addr, val);
        overlap.insert(addr);
        trace(99, "load") << "0x" << HEXWORD << addr << " -> " << HEXBYTE << NUM(read_mem_u8(addr)) << end();
        ++addr;
      }
    }
    if (seg.name == "code") {
      End_of_program = addr;
      EIP = seg.start;
      // End Initialize EIP
    }
  }
}

const segment* find(const program& p, const string& segment_name) {
  for (int i = 0;  i < SIZE(p.segments);  ++i) {
    if (p.segments.at(i).name == segment_name)
      return &p.segments.at(i);
  }
  return NULL;
}

uint8_t hex_byte(const string& s) {
  istringstream in(s);
  int result = 0;
  in >> std::hex >> result;
  if (!in || !in.eof()) {
    raise << "token '" << s << "' is not a hex byte\n" << end();
    return '\0';
  }
  if (result > 0xff || result < -0x8f) {
    raise << "token '" << s << "' is not a hex byte\n" << end();
    return '\0';
  }
  return static_cast<uint8_t>(result);
}

void test_number_too_large() {
  Hide_errors = true;
  parse_and_load(
      "== code 0x1\n"
      "01 cab\n"
  );
  CHECK_TRACE_CONTENTS(
      "error: token 'cab' is not a hex byte\n"
  );
}

void test_invalid_hex() {
  Hide_errors = true;
  parse_and_load(
      "== code 0x1\n"
      "01 cx\n"
  );
  CHECK_TRACE_CONTENTS(
      "error: token 'cx' is not a hex byte\n"
  );
}

void test_negative_number() {
  parse_and_load(
      "== code 0x1\n"
      "01 -02\n"
  );
  CHECK_TRACE_COUNT("error", 0);
}

void test_negative_number_too_small() {
  Hide_errors = true;
  parse_and_load(
      "== code 0x1\n"
      "01 -12345\n"
  );
  CHECK_TRACE_CONTENTS(
      "error: token '-12345' is not a hex byte\n"
  );
}

void test_hex_prefix() {
  parse_and_load(
      "== code 0x1\n"
      "0x01 -0x02\n"
  );
  CHECK_TRACE_COUNT("error", 0);
}

void test_repeated_segment_merges_data() {
  parse_and_load(
      "== code 0x1\n"
      "11 22\n"
      "== code\n"  // again
      "33 44\n"
  );
  CHECK_TRACE_CONTENTS(
      "parse: new segment 'code'\n"
      "parse: appending to segment 'code'\n"
      // first segment
      "load: 0x00000001 -> 11\n"
      "load: 0x00000002 -> 22\n"
      // second segment
      "load: 0x00000003 -> 33\n"
      "load: 0x00000004 -> 44\n"
  );
}

void test_error_on_missing_segment_header() {
  Hide_errors = true;
  parse_and_load(
      "01 02\n"
  );
  CHECK_TRACE_CONTENTS(
      "error: input does not start with a '==' section header\n"
  );
}

//: helper for tests
void parse_and_load(const string& text_bytes) {
  program p;
  istringstream in(text_bytes);
  parse(in, p);
  if (trace_contains_errors()) return;  // if any stage raises errors, stop immediately
  load(p);
}

//:: run

:(before "End Initialize Op Names")
put_new(Name, "b8", "copy imm32 to EAX (mov)");

//: our first opcode

:(before "End Single-Byte Opcodes")
case 0xb8: {  // copy imm32 to EAX
  const int32_t src = next32();
  trace(Callstack_depth+1, "run") << "copy imm32 0x" << HEXWORD << src << " to EAX" << end();
  Reg[EAX].i = src;
  break;
}

:(code)
void test_copy_imm32_to_EAX_again() {
  run(
      "== code 0x1\n"  // code segment
      // op     ModR/M  SIB   displacement  immediate
      "  b8                                 0a 0b 0c 0d \n"  // copy 0x0d0c0b0a to EAX
  );
  CHECK_TRACE_CONTENTS(
      "run: copy imm32 0x0d0c0b0a to EAX\n"
  );
}

// read a 32-bit int in little-endian order from the instruction stream
int32_t next32() {
  int32_t result = read_mem_i32(EIP);
  EIP+=4;
  return result;
}

//:: helpers

string to_string(const word& w) {
  ostringstream out;
  out << w.data;
  for (int i = 0;  i < SIZE(w.metadata);  ++i)
    out << " /" << w.metadata.at(i);
  return out.str();
}

int32_t parse_int(const string& s) {
  if (s.empty()) return 0;
  istringstream in(s);
  in >> std::hex;
  if (s.at(0) == '-') {
    int32_t result = 0;
    in >> result;
    if (!in || !in.eof()) {
      raise << "not a number: " << s << '\n' << end();
      return 0;
    }
    return result;
  }
  uint32_t uresult = 0;
  in >> uresult;
  if (!in || !in.eof()) {
    raise << "not a number: " << s << '\n' << end();
    return 0;
  }
  return static_cast<int32_t>(uresult);
}
:(before "End Unit Tests")
void test_parse_int() {
  CHECK_EQ(0, parse_int("0"));
  CHECK_EQ(0, parse_int("0x0"));
  CHECK_EQ(0, parse_int("0x0"));
  CHECK_EQ(16, parse_int("10"));  // hex always
  CHECK_EQ(-1, parse_int("-1"));
  CHECK_EQ(-1, parse_int("0xffffffff"));
}