File: modprep.d

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# MODPREP - CLISP module preprocessor
# Bruno Haible 20.9.1998, 10.-11.10.1998

# This preprocessor generates all necessary tables for a CLISP module.
# The input file is normal C code, modified like this:
# - It includes "clisp.h".
# - There is one (and only one) declaration
#     DEFMODULE(module_name,"PACKAGE-NAME")
#   module_name is the clisp module name.
#   PACKAGE-NAME is the default package name (in upper case) for Lisp
#   functions.
# - Constant Lisp objects can be referred to using the backquote syntax:
#     pushSTACK(`:TEST`);
#     value1 = `#()`;
#   The backquoted strings are read in at module load time.
# - The definition of Lisp functions is done using the macro
#     DEFUN(function_name, lambda_list)
#   for example
#     DEFUN(foo::bar, x y [&optional z] [&rest foo | &key a b c] )
#   &rest and &key cannot be combined (this is a restriction for SUBRs).
#   &key requires at least one keyword (this is a restriction for SUBRs too).
# - Variables containing Lisp objects (known to the garbage collector) are
#   defined using the macro
#     DEFVAR(variable_name, initform)
#   where initform is a C form. (You can also specify a Lisp initform, by
#   using the backquote syntax.) The variable can be referred to as
#     O(variable_name)
#   These variables are private to the module.

# Restrictions and caveats:
# - A module should consist of a single file.
# - The last line in the input file should be terminated with a newline.
# - #line lines should not be separated into multiple lines using
#   backslash-newline.
# - No multi-line comments should start in a preprocessor line.
# - #if conditions are assumed to be constant from the DEFMODULE call to
#   the end of the file. All necessary #define's should therefore be done
#   before the DEFMODULE call.


#define local static
#define global
#define var
#define loop  while (1)
#define until(exp)  while (!(exp))
typedef unsigned char  uintB;
typedef unsigned short  uintW;
typedef unsigned long  uintL;
typedef int  boolean;
#define FALSE 0
#define TRUE 1

#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <errno.h>
#include <stdio.h>

#ifndef NULL
#define NULL ((void*)0)
#endif

#ifdef __cplusplus
extern "C" void exit(int);
#endif

#if !(defined(__GNUC__) && !defined(__STRICT_ANSI__))
#define inline
#endif


# Memory utilities.

local char* xmalloc (uintL count)
{
  var char* tmp = (char*)malloc(count);
  if (!tmp) {
    fprintf(stderr,"Virtual memory exhausted.\n");
    exit(1);
  }
  return tmp;
}

local char* xrealloc (void* data, uintL count)
{
  var char* tmp = (char*)realloc(data,count);
  if (!tmp) {
    fprintf(stderr,"Virtual memory exhausted.\n");
    exit(1);
  }
  return tmp;
}

local inline void xfree (void* ptr)
{
  free((char*)ptr);
}


# Character utilities.

# Determine whether a character (not newline) is whitespace.
local inline boolean is_whitespace (char c)
{
  return (c == ' ') || (c == '\t');
}

# Determine whether a charater is a digit (locale independent).
local inline boolean is_digit (char c)
{
  return (c >= '0') && (c <= '9');
}


# String utilities.

# Returns the freshly allocated contenation of 2 strings.
local char* concat2 (const char* str1, const char* str2)
{
  var uintL len1 = strlen(str1);
  var uintL len2 = strlen(str2);
  var char* result = xmalloc(len1+len2+1);
  memcpy(result+0,str1,len1);
  memcpy(result+len1,str2,len2+1);
  return result;
}

# Returns the freshly allocated contenation of 3 strings.
local char* concat3 (const char* str1, const char* str2, const char* str3)
{
  var uintL len1 = strlen(str1);
  var uintL len2 = strlen(str2);
  var uintL len3 = strlen(str3);
  var char* result = xmalloc(len1+len2+len3+1);
  memcpy(result+0,str1,len1);
  memcpy(result+len1,str2,len2);
  memcpy(result+len1+len2,str3,len3+1);
  return result;
}

# Returns the freshly allocated contenation of 4 strings.
local char* concat4 (const char* str1, const char* str2, const char* str3, const char* str4)
{
  var uintL len1 = strlen(str1);
  var uintL len2 = strlen(str2);
  var uintL len3 = strlen(str3);
  var uintL len4 = strlen(str4);
  var char* result = xmalloc(len1+len2+len3+len4+1);
  memcpy(result+0,str1,len1);
  memcpy(result+len1,str2,len2);
  memcpy(result+len1+len2,str3,len3);
  memcpy(result+len1+len2+len3,str4,len4+1);
  return result;
}

# Returns a freshly allocated substring.
local char* substring (const char* str, uintL index1, uintL index2)
{
  if (!(index1 <= index2)) abort();
  if (!(index2 <= strlen(str))) abort();
  { var uintL len = index2-index1;
    var char* result = xmalloc(len+1);
    if (len > 0) memcpy(result,str+index1,len);
    result[len] = '\0';
    return result;
} }

# Returns a freshly allocated substring.
local char* substring_from_to (const char* p1, const char* p2)
{
  var uintL length = p2 - p1;
  var char* result = (char*) xmalloc(length+1);
  memcpy(result,p1,length);
  result[length] = '\0';
  return result;
}

# Compares two strings for equality.
local inline boolean String_equals (const char* str1, const char* str2)
{
  return !strcmp(str1,str2);
}

# Compares two strings for case-insensitive equality.
local boolean String_equalsIgnoreCase (const char* str1, const char* str2)
{
  while (*str1 != '\0' && *str2 != '\0') {
    var unsigned char c1 = (unsigned char)(*str1++);
    var unsigned char c2 = (unsigned char)(*str2++);
    if (c1 < 0x80) /* isascii(c1) */
      c1 = toupper(c1);
    if (c2 < 0x80) /* isascii(c2) */
      c2 = toupper(c2);
    if (c1 != c2)
      return FALSE;
  }
  # Now *str1 == '\0' || *str2 == '\0'.
  return (*str1 == *str2);
}


# Extensible vectors.

typedef struct {
  uintL index;
  uintL size;
  const void* * data;
} Vector;

local inline void Vector_init (Vector* v)
{
  v->size = 5;
  v->data = (const void* *) xmalloc(v->size * sizeof(const void*));
  v->index = 0;
}

local inline uintL Vector_length (const Vector* v)
{
  return v->index;
}

local void Vector_add (Vector* v, const void* elt)
{
  if (v->index >= v->size) {
    v->size = 2 * v->size;
    v->data = (const void* *) xrealloc(v->data, v->size * sizeof(const void*));
  }
  v->data[v->index++] = elt;
}

local const void * Vector_element (const Vector* v, uintL i)
{
  if (!(i < v->index)) {
    fprintf(stderr,"vector index out of bounds");
    abort();
  }
  return v->data[i];
}

local void Vector_set_element (Vector* v, uintL i, const void* elt)
{
  if (!(i < v->index)) {
    fprintf(stderr,"vector index out of bounds");
    abort();
  }
  v->data[i] = elt;
}

local void Vector_remove_element (Vector* v, uintL i)
{
  if (!(i < v->index)) {
    fprintf(stderr,"vector index out of bounds");
    abort();
  }
  v->index--;
  for (; i < v->index; i++)
    v->data[i] = v->data[i+1];
}

#ifdef unused
local void Vector_init_clone (Vector* w, const Vector* v)
{
  w->size = (v->size < 5 ? 5 : v->size);
  w->data = (const void* *) xmalloc(w->size * sizeof(const void*));
  memcpy(w->data,v->data,v->size * sizeof(const void*));
  w->index = v->size;
}
#endif

#ifdef unused
local Vector* Vector_clone (const Vector* v)
{
  var Vector* w = (Vector*) xmalloc(sizeof(Vector));
  Vector_init_clone(w,v);
  return w;
}
#endif


# All data is bufferized in lines.

typedef struct {
  long number;
  char* contents;
} Line;

local inline Line* make_Line (long number, char* contents)
{
  var Line* result = (Line*) xmalloc(sizeof(Line));
  result->number = number;
  result->contents = contents;
  return result;
}


# Current source file.

local const char* file = "(stdin)";

# Current line number (used for input and later the output as well).

local long lineno;


# A vector of lines.

typedef struct {
  Vector rep;
} VectorLine;

local inline void VectorLine_init (VectorLine* v)
{
  Vector_init(&v->rep);
}

local inline uintL VectorLine_length (const VectorLine* v)
{
  return Vector_length(&v->rep);
}

local inline void VectorLine_add (VectorLine* v, const Line* elt)
{
  Vector_add(&v->rep,elt);
}

local inline Line* VectorLine_element (const VectorLine* v, uintL i)
{
  return (Line*) Vector_element(&v->rep,i);
}

#ifdef unused
local inline void VectorLine_set_element (VectorLine* v, uintL i, const Line* elt)
{
  Vector_set_element(&v->rep,i,elt);
}
#endif


# ================================== INPUT ==================================


# The vector of all lines read.

local VectorLine* lines;


# Read a line, or NULL if EOF is encountered.

local char* get_line (FILE* fp)
{
  var int len = 1;
  var char* line = (char*) xmalloc(len);
  var int index = 0;
  loop {
    var int c = getc(fp);
    if (c==EOF) { if (index>0) break; else { xfree(line); return NULL; } }
    if (c=='\n') break;
    if (index >= len-1) {
      len = 2*len;
      line = (char*) xrealloc(line,len);
    }
    line[index++] = c;
  }
  line[index] = '\0';
  return line;
}


# Decode a #line directive. If the line represents a #line directive,
# return the line number. Else return -1.

local int decode_line_directive (const char* line)
{
  var uintL n = strlen(line);
  var uintL i = 0;
  # Skip whitespace.
  for (; i < n && is_whitespace(line[i]); i++);
  # Parse a '#'.
  if (i < n && line[i] == '#')
    i++;
  else
    return -1;
  # Skip whitespace.
  for (; i < n && is_whitespace(line[i]); i++);
  # Check for "line".
  if (i+4 < n
      && line[i+0] == 'l'
      && line[i+1] == 'i'
      && line[i+2] == 'n'
      && line[i+3] == 'e'
      && is_whitespace(line[i+4])) {
    i += 4;
    for (; i < n && is_whitespace(line[i]); i++);
  }
  # Check for a digit.
  if (!(i < n && is_digit(line[i])))
    return -1;
  { var uintL i1 = i;
    for (; i < n && is_digit(line[i]); i++);
    { var uintL i2 = i;
      # Convert digit string to a `long'.
      var char* digits = substring(line,i1,i2);
      errno = 0;
      { var long result = strtol(digits,NULL,10);
        xfree(digits);
        if (errno != 0) return -1;
        if (result < 0) abort();
        # Check for a source file name.
        for (; i < n && is_whitespace(line[i]); i++);
        if (i < n && line[i] == '"') {
          var uintL i3;
          i++;
          i3 = i;
          for (; i < n && line[i] != '"'; i++);
          if (i < n && line[i] == '"') {
            var uintL i4 = i;
            file = substring(line,i3,i4);
          }
        }
        return result;
} } } }


# Read the input file. Fill `lines'.

local void read_all_input (FILE* fp)
{
  lineno = 1;
  lines = (VectorLine*)xmalloc(sizeof(VectorLine)); VectorLine_init(lines);
  {
    var boolean is_continuation_line = FALSE;
    loop {
      var char* line = get_line(fp);
      if (!line) break;
      if (is_continuation_line) {
        var Line* last = VectorLine_element(lines,VectorLine_length(lines)-1);
        var char* prev = substring(last->contents,0,strlen(last->contents)-1);
        var char* conc = concat2(prev,line);
        xfree(last->contents);
        xfree(prev);
        xfree(line);
        line = last->contents = conc;
        lineno++;
      } else {
        var long line_directive = decode_line_directive(line);
        if (line_directive >= 0) {
          lineno = line_directive;
          line = "";
        } else {
          VectorLine_add(lines,make_Line(lineno,line));
          lineno++;
        }
      }
      { var uintL linelen = strlen(line);
        is_continuation_line = (linelen > 0 && line[linelen-1] == '\\');
      }
    }
} }


# ================================== PARSE ==================================


# A vector of strings.

typedef struct {
  Vector rep;
} VectorString;

local inline void VectorString_init (VectorString* v)
{
  Vector_init(&v->rep);
}

local VectorString* make_VectorString ()
{
  var VectorString* v = (VectorString*) xmalloc(sizeof(VectorString));
  VectorString_init(v);
  return v;
}

local inline uintL VectorString_length (const VectorString* v)
{
  return Vector_length(&v->rep);
}

local inline void VectorString_add (VectorString* v, const char* elt)
{
  Vector_add(&v->rep,elt);
}

local inline const char* VectorString_element (const VectorString* v, uintL i)
{
  return (const char*) Vector_element(&v->rep,i);
}

local inline void VectorString_set_element (VectorString* v, uintL i, const char* elt)
{
  Vector_set_element(&v->rep,i,elt);
}

#ifdef unused
local inline void VectorString_init_clone (VectorString* w, const VectorString* v)
{
  Vector_init_clone(&w->rep,&v->rep);
}
#endif

#ifdef unused
local VectorString* VectorString_clone (const VectorString* v)
{
  var VectorString* w = (VectorString*) xmalloc(sizeof(VectorString));
  VectorString_init_clone(w,v);
  return w;
}
#endif

# Tests whether v starts with w.
local boolean VectorString_startsWith (const VectorString* v, const VectorString* w)
{
  var uintL n = VectorString_length(w);
  if (VectorString_length(v) >= n) {
    var uintL i;
    for (i = 0; i < n; i++)
      if (!String_equals(VectorString_element(v,i),VectorString_element(w,i)))
        return FALSE;
    return TRUE;
  }
  return FALSE;
}


# A stack of vectors of strings.

typedef struct {
  Vector rep;
} StackVectorString;

local inline void StackVectorString_init (StackVectorString* v)
{
  Vector_init(&v->rep);
}

local StackVectorString* make_StackVectorString ()
{
  var StackVectorString* v = (StackVectorString*) xmalloc(sizeof(StackVectorString));
  StackVectorString_init(v);
  return v;
}

local inline uintL StackVectorString_length (const StackVectorString* v)
{
  return Vector_length(&v->rep);
}

#ifdef unused
local inline boolean StackVectorString_is_empty (const StackVectorString* v)
{
  return StackVectorString_length(v) == 0;
}
#endif

local inline void StackVectorString_push (StackVectorString* v, const VectorString* elt)
{
  Vector_add(&v->rep,elt);
}

local inline VectorString* StackVectorString_element (const StackVectorString* v, uintL i)
{
  return (VectorString*) Vector_element(&v->rep,i);
}

local VectorString* StackVectorString_peek (StackVectorString* v)
{
  var uintL n = StackVectorString_length(v);
  if (n == 0) { fprintf(stderr,"stack empty\n"); exit(1); }
  return StackVectorString_element(v,n-1);
}

local VectorString* StackVectorString_pop (StackVectorString* v)
{
  var uintL n = StackVectorString_length(v);
  if (n == 0) { fprintf(stderr,"stack empty\n"); exit(1); }
  { var VectorString* result = StackVectorString_element(v,n-1);
    v->rep.index -= 1;
    return result;
} }

# Push elt, and optimize: elt can be removed if is starts with an already
# present string sequence. If another element starts with elt, that one can
# be removed.
local void StackVectorString_push_optimize (StackVectorString* v, const VectorString* elt)
{
  var uintL n = StackVectorString_length(v);
  var uintL i;
  for (i = 0; i < n; i++)
    if (VectorString_startsWith(elt,StackVectorString_element(v,i)))
      return;
  for (i = 0; i < n; )
    if (VectorString_startsWith(StackVectorString_element(v,i),elt)) {
      Vector_remove_element(&v->rep,i);
      n--;
    } else
      i++;
  Vector_add(&v->rep,elt);
}


# The #if[def] stack. All the conditions are implicitly combined by &&.
# For every #if we start a new entry in the stack, which is popped when we
# see the corresponding #endif. This is a stack of vector of string, not a
# stack of string, because when a #elif is seen, we add an element to the
# stack without popping the previous one.

local StackVectorString* ifdef_stack;

# Operations on the #if[def] stack.

local void do_if (const char * condition)
{
  var VectorString* v = make_VectorString();
  VectorString_add(v,condition);
  StackVectorString_push(ifdef_stack,v);
}

local void do_else ()
{
  var VectorString* v = StackVectorString_peek(ifdef_stack);
  var uintL i = VectorString_length(v) - 1;
  var const char* lastcondition = VectorString_element(v,i);
  lastcondition = concat3("!(",lastcondition,")");
  VectorString_set_element(v,i,lastcondition);
}

local void do_elif (const char * condition)
{
  var VectorString* v = StackVectorString_peek(ifdef_stack);
  var uintL i = VectorString_length(v) - 1;
  var const char* lastcondition = VectorString_element(v,i);
  lastcondition = concat3("!(",lastcondition,")");
  VectorString_set_element(v,i,lastcondition);
  VectorString_add(v,condition);
}

local void do_endif ()
{
  StackVectorString_pop(ifdef_stack);
}

# Returns the current #if condition.
# It is a vector of strings, implicitly combined by &&.
# The vector is freshly constructed, but the strings are shared.

local VectorString* current_condition ()
{
  var VectorString* result = make_VectorString();
  var uintL n = StackVectorString_length(ifdef_stack);
  var uintL i;
  for (i = 0; i < n; i++) {
    var const VectorString* v = StackVectorString_element(ifdef_stack,i);
    var uintL m = VectorString_length(v);
    var uintL j;
    for (j = 0; j < m; j++)
      VectorString_add(result,VectorString_element(v,j));
  }
  return result;
}


# Parsing of #if/#else/#elif/#endif lines.

local const char* is_if (const char* line)
{
  var uintL n = strlen(line);
  var uintL i = 0;
  # Skip whitespace.
  for (; i < n && is_whitespace(line[i]); i++);
  # Parse a '#'.
  if (i < n && line[i] == '#')
    i++;
  else
    return NULL;
  # Skip whitespace.
  for (; i < n && is_whitespace(line[i]); i++);
  # Check for "if".
  if (i+2 < n
      && line[i+0] == 'i'
      && line[i+1] == 'f'
      && is_whitespace(line[i+2])) {
    i += 3;
    for (; i < n && is_whitespace(line[i]); i++);
    for (; n > i && is_whitespace(line[n-1]); n--);
    return substring(line,i,n);
  }
  # Check for "ifdef".
  if (i+5 < n
      && line[i+0] == 'i'
      && line[i+1] == 'f'
      && line[i+2] == 'd'
      && line[i+3] == 'e'
      && line[i+4] == 'f'
      && is_whitespace(line[i+5])) {
    i += 6;
    for (; i < n && is_whitespace(line[i]); i++);
    for (; n > i && is_whitespace(line[n-1]); n--);
    { var char* term = substring(line,i,n);
      var const char* result = concat3("defined(",term,")");
      xfree(term);
      return result;
  } }
  # Check for "ifndef".
  if (i+6 < n
      && line[i+0] == 'i'
      && line[i+1] == 'f'
      && line[i+2] == 'n'
      && line[i+3] == 'd'
      && line[i+4] == 'e'
      && line[i+5] == 'f'
      && is_whitespace(line[i+6])) {
    i += 7;
    for (; i < n && is_whitespace(line[i]); i++);
    for (; n > i && is_whitespace(line[n-1]); n--);
    { var char* term = substring(line,i,n);
      var const char* result = concat3("!defined(",term,")");
      xfree(term);
      return result;
  } }
  return NULL;
}

local boolean is_else (const char* line)
{
  var uintL n = strlen(line);
  var uintL i = 0;
  # Skip whitespace.
  for (; i < n && is_whitespace(line[i]); i++);
  # Parse a '#'.
  if (i < n && line[i] == '#')
    i++;
  else
    return FALSE;
  # Skip whitespace.
  for (; i < n && is_whitespace(line[i]); i++);
  # Check for "else".
  if (i+4 <= n
      && line[i+0] == 'e'
      && line[i+1] == 'l'
      && line[i+2] == 's'
      && line[i+3] == 'e'
      && (i+4 == n || is_whitespace(line[i+4]))) {
    return TRUE;
  }
  return FALSE;
}

local const char* is_elif (const char* line)
{
  var uintL n = strlen(line);
  var uintL i = 0;
  # Skip whitespace.
  for (; i < n && is_whitespace(line[i]); i++);
  # Parse a '#'.
  if (i < n && line[i] == '#')
    i++;
  else
    return NULL;
  # Skip whitespace.
  for (; i < n && is_whitespace(line[i]); i++);
  # Check for "elif".
  if (i+4 < n
      && line[i+0] == 'e'
      && line[i+1] == 'l'
      && line[i+2] == 'i'
      && line[i+3] == 'f'
      && is_whitespace(line[i+4])) {
    i += 5;
    for (; i < n && is_whitespace(line[i]); i++);
    for (; n > i && is_whitespace(line[n-1]); n--);
    return substring(line,i,n);
  }
  return NULL;
}

local boolean is_endif (const char* line)
{
  var uintL n = strlen(line);
  var uintL i = 0;
  # Skip whitespace.
  for (; i < n && is_whitespace(line[i]); i++);
  # Parse a '#'.
  if (i < n && line[i] == '#')
    i++;
  else
    return FALSE;
  # Skip whitespace.
  for (; i < n && is_whitespace(line[i]); i++);
  # Check for "endif".
  if (i+5 <= n
      && line[i+0] == 'e'
      && line[i+1] == 'n'
      && line[i+2] == 'd'
      && line[i+3] == 'i'
      && line[i+4] == 'f'
      && (i+5 == n || is_whitespace(line[i+5]))) {
    return TRUE;
  }
  return FALSE;
}


# When we see the DEFMODULE(name,package) line, we store the name.
local const char* name_defmodule = NULL;
local uintL line_defmodule = 0; # index of line containing DEFMODULE
local const char* default_packname = NULL;

local boolean is_defmodule (const char* line) {
  var uintL n = strlen(line);
  var uintL i = 0;
  # Skip whitespace.
  for (; i < n && is_whitespace(line[i]); i++);
  # Check for "DEFMODULE".
  if (i+9 < n
      && line[i+0] == 'D'
      && line[i+1] == 'E'
      && line[i+2] == 'F'
      && line[i+3] == 'M'
      && line[i+4] == 'O'
      && line[i+5] == 'D'
      && line[i+6] == 'U'
      && line[i+7] == 'L'
      && line[i+8] == 'E'
      && (is_whitespace(line[i+9]) || line[i+9] == '(')) {
    i += 9;
    for (; i < n && is_whitespace(line[i]); i++);
    if (i < n && line[i] == '(') {
      var uintL i1, i2;
      i += 1;
      i1 = i;
      for (; i < n; i++)
        if (line[i] == ',' || line[i] == '(' || line[i] == ')')
          break;
      i2 = i;
      if (i < n && line[i] == ',') {
        var uintL i3, i4;
        i += 1;
        i3 = i;
        for (; i < n; i++)
          if (line[i] == ',' || line[i] == '(' || line[i] == ')')
            break;
        i4 = i;
        if (i < n && line[i] == ')') {
          # First macro argument is from i1 to i2, second is from i3 to i4.
          while (i1 < i2 && is_whitespace(line[i1])) i1++;
          while (i1 < i2 && is_whitespace(line[i2-1])) i2--;
          while (i3 < i4 && is_whitespace(line[i3])) i3++;
          while (i3 < i4 && is_whitespace(line[i4-1])) i4--;
          if (i4-i3 >= 2 && line[i3] == '"' && line[i4-1] == '"') {
            name_defmodule = substring(line,i1,i2);
            default_packname = substring(line,i3+1,i4-1);
            return TRUE;
          }
        }
      }
    }
    fprintf(stderr,"%s:%ld: invalid DEFMODULE macro syntax: %s\n",file,lineno,line);
    exit(1);
  }
  return FALSE;
}


# Entries for the object table.

typedef struct {
  const char* initstring; # The string that, when read by the Lisp reader,
                          # initializes the object.
  const char* tag;        # The struct tag we use for this object.
  StackVectorString* condition; # The #if condition of this object.
} Objdef;


# A vector of Objdef.

typedef struct {
  Vector rep;
} VectorObjdef;

local inline void VectorObjdef_init (VectorObjdef* v)
{
  Vector_init(&v->rep);
}

local VectorObjdef* make_VectorObjdef ()
{
  var VectorObjdef* v = (VectorObjdef*) xmalloc(sizeof(VectorObjdef));
  VectorObjdef_init(v);
  return v;
}

local inline uintL VectorObjdef_length (const VectorObjdef* v)
{
  return Vector_length(&v->rep);
}

local inline void VectorObjdef_add (VectorObjdef* v, Objdef* elt)
{
  Vector_add(&v->rep,elt);
}

local inline Objdef* VectorObjdef_element (const VectorObjdef* v, uintL i)
{
  return (Objdef*) Vector_element(&v->rep,i);
}

#ifdef unused
local inline void VectorObjdef_set_element (VectorObjdef* v, uintL i, Objdef* elt)
{
  Vector_set_element(&v->rep,i,elt);
}
#endif


# The table of all Objdefs.

local VectorObjdef* objdefs;

# Looks up an Objdef with a given tag.

local Objdef* get_objdef_from_tag (const char* tag)
{
  var uintL n = VectorObjdef_length(objdefs);
  var uintL i;
  for (i = 0; i < n; i++) {
    var Objdef* odef = VectorObjdef_element(objdefs,i);
    if (String_equals(odef->tag,tag))
      return odef;
  }
  return NULL;
}

# Looks up or creates an Objdef for a given initstring.

local Objdef* get_objdef_aux (const char* initstring, VectorString* condition)
{
  var Objdef* odef;
  # First search in the table.
  {
    var uintL n = VectorObjdef_length(objdefs);
    var uintL i;
    for (i = 0; i < n; i++) {
      odef = VectorObjdef_element(objdefs,i);
      if (String_equals(odef->initstring,initstring))
        goto found;
    }
  }
  # Create the tag.
  {
    var char* tagbuf = (char*) xmalloc(3*strlen(initstring)+10);
    var char* q = tagbuf;
    strcpy(q,"object_");
    q += strlen(q);
    {
      var const char* p;
      for (p = initstring; *p != '\0'; p++) {
        var char c = *p;
        if (c >= 'A' && c <= 'Z')
          *q++ = c+32;
        else if ((c >= 'a' && c <= 'z') || (c >= '0' && c <= '9'))
          *q++ = c;
        else if (c == ':' && p == initstring)
          *q++ = 'K';
        else {
          *q++ = '_';
          *q++ = "0123456789ABCDEF"[((unsigned char)c >> 4) & 0x0F];
          *q++ = "0123456789ABCDEF"[(unsigned char)c & 0x0F];
        }
      }
    }
    *q = '\0';
    if (get_objdef_from_tag(tagbuf) != NULL) {
      var int i;
      # Append a suffix to make sure tags are unique.
      for (i = 1; ; i++) {
        sprintf(q,"_%d",i);
        if (get_objdef_from_tag(tagbuf) == NULL)
          break;
      }
    }
    # Found a unique tag. Allocate a new Objdef.
    {
      var char* tag = (char*) xmalloc(strlen(tagbuf)+1);
      strcpy(tag,tagbuf);
      xfree(tagbuf);
      odef = (Objdef*) xmalloc(sizeof(Objdef));
      odef->initstring = initstring;
      odef->tag = tag;
      odef->condition = make_StackVectorString();
      VectorObjdef_add(objdefs,odef);
    }
  }
found:
  StackVectorString_push_optimize(odef->condition,condition);
  return odef;
}

local inline Objdef* get_objdef (const char* initstring)
{
  return get_objdef_aux(initstring,current_condition());
}


# Representation of a function signature.

typedef struct {
  int req;
  int opt;
  boolean rest;
  boolean key;
  VectorObjdef* keywords;
  StackVectorString* condition; # The #if condition of this object.
} Signature;

# Compares two signatures for equality (without condition).

local boolean Signature_equals (const Signature* sig1, const Signature* sig2)
{
  if (sig1->req == sig2->req) {
    if (sig1->opt == sig2->opt) {
      if (sig1->rest == sig2->rest) {
        if (sig1->key == sig2->key) {
          var uintL len1 = VectorObjdef_length(sig1->keywords);
          var uintL len2 = VectorObjdef_length(sig2->keywords);
          if (len1 == len2) {
            var uintL i;
            for (i = 0; i < len1; i++)
              if (VectorObjdef_element(sig1->keywords,i) != VectorObjdef_element(sig2->keywords,i))
                return FALSE;
            return TRUE;
          }
        }
      }
    }
  }
  return FALSE;
}

# Returns the signature (without condition) denoted by the line, or NULL
# in case of syntax error.
# Example for line: "x y [&optional z] [&rest foo | &key a b c]"

local Signature* parseSignature (const char* line)
{
  var int req = 0;
  var int opt = 0;
  var int rest = 0;
  var VectorObjdef* keywords = make_VectorObjdef();
  var boolean optional_seen = FALSE;
  var boolean rest_seen = FALSE;
  var boolean key_seen = FALSE;
  # Go through the line and tokenize it.
  var const char* p1 = line;
  var const char* p2;
  for (;;) {
    while (is_whitespace(*p1))
      p1++;
    if (*p1 == '\0')
      break;
    p2 = p1;
    while (*p2 != '\0' && !is_whitespace(*p2))
      p2++;
    # Found a token from p1 to p2.
    {
      var char* token = substring_from_to(p1,p2);
      # Analyze the token.
      if (String_equalsIgnoreCase(token,"&optional")) {
        if (optional_seen || rest_seen || key_seen)
          return NULL;
        optional_seen = TRUE;
      } else if (String_equalsIgnoreCase(token,"&key")) {
        if (rest_seen || key_seen)
          return NULL;
        key_seen = TRUE;
      } else if (String_equalsIgnoreCase(token,"&rest")) {
        if (rest_seen || key_seen)
          return NULL;
        rest_seen = TRUE;
      } else {
        if (rest_seen)
          rest++;
        else if (key_seen) {
          var char* keyword_name;
          var char* keyword_initstring;
          var Objdef* keyword_odef;
          if ((keyword_name = strrchr(token,':')) != NULL)
            keyword_name = keyword_name+1;
          else
            keyword_name = token;
          keyword_initstring = concat2(":",keyword_name);
          keyword_odef = get_objdef(keyword_initstring);
          VectorObjdef_add(keywords,keyword_odef);
        } else if (optional_seen)
          opt++;
        else
          req++;
      }
      xfree(token);
    }
    p1 = p2;
  }
  if (rest_seen && rest != 1)
    return NULL;
  {
    var Signature* sig = (Signature*) xmalloc(sizeof(Signature));
    sig->req = req;
    sig->opt = opt;
    sig->rest = rest_seen;
    sig->key = key_seen;
    sig->keywords = keywords;
    return sig;
  }
}


# A vector of Signature.

typedef struct {
  Vector rep;
} VectorSignature;

local inline void VectorSignature_init (VectorSignature* v)
{
  Vector_init(&v->rep);
}

local VectorSignature* make_VectorSignature ()
{
  var VectorSignature* v = (VectorSignature*) xmalloc(sizeof(VectorSignature));
  VectorSignature_init(v);
  return v;
}

local inline uintL VectorSignature_length (const VectorSignature* v)
{
  return Vector_length(&v->rep);
}

local inline void VectorSignature_add (VectorSignature* v, Signature* elt)
{
  Vector_add(&v->rep,elt);
}

local inline Signature* VectorSignature_element (const VectorSignature* v, uintL i)
{
  return (Signature*) Vector_element(&v->rep,i);
}

#ifdef unused
local inline void VectorSignature_set_element (VectorSignature* v, uintL i, Signature* elt)
{
  Vector_set_element(&v->rep,i,elt);
}
#endif


# Entries for the function table.

typedef struct {
  const char* packname;  # The symbol's package name
  const char* printname; # The symbol's print name
  const char* tag;       # The struct tag we use for this function
  StackVectorString* condition; # The total #if condition of this function.
  VectorSignature* signatures; # The functions possible signatures, together
                               # with their individual #if conditions.
} Fundef;


# A vector of Fundef.

typedef struct {
  Vector rep;
} VectorFundef;

local inline void VectorFundef_init (VectorFundef* v)
{
  Vector_init(&v->rep);
}

local VectorFundef* make_VectorFundef ()
{
  var VectorFundef* v = (VectorFundef*) xmalloc(sizeof(VectorFundef));
  VectorFundef_init(v);
  return v;
}

local inline uintL VectorFundef_length (const VectorFundef* v)
{
  return Vector_length(&v->rep);
}

local inline void VectorFundef_add (VectorFundef* v, Fundef* elt)
{
  Vector_add(&v->rep,elt);
}

local inline Fundef* VectorFundef_element (const VectorFundef* v, uintL i)
{
  return (Fundef*) Vector_element(&v->rep,i);
}

#ifdef unused
local inline void VectorFundef_set_element (VectorFundef* v, uintL i, Fundef* elt)
{
  Vector_set_element(&v->rep,i,elt);
}
#endif


# The table of all Fundefs.

local VectorFundef* fundefs;

# Looks up an Fundef with a given tag.

local Fundef* get_fundef_from_tag (const char* tag)
{
  var uintL n = VectorFundef_length(fundefs);
  var uintL i;
  for (i = 0; i < n; i++) {
    var Fundef* fdef = VectorFundef_element(fundefs,i);
    if (String_equals(fdef->tag,tag))
      return fdef;
  }
  return NULL;
}

# Looks up or creates a Fundef for a given function name, and adds the given
# signature to it.

local Fundef* get_fundef_aux (const char* funname, Signature* sig, VectorString* condition)
{
  var Fundef* fdef;
  # Split the function name into a package name and a print name.
  var const char* packname;
  var const char* printname;
  {
    var const char* tmp = strchr(funname,':');
    if (tmp) {
      packname = substring_from_to(funname,tmp);
      tmp++;
      if (*tmp == ':')
        tmp++;
      if (strchr(tmp,':')) {
        fprintf(stderr,"%s:%ld: Function definition symbol has too many package markers: %s\n",file,lineno,funname);
        exit(1);
      }
      printname = substring(tmp,0,strlen(tmp));
    } else {
      if (default_packname == NULL) {
        fprintf(stderr,"%s:%ld: Function definition needs a packaged symbol: %s\n",file,lineno,funname);
        exit(1);
      } else {
        packname = default_packname;
        printname = funname;
      }
    }
  }
  # First search in the table.
  {
    var uintL n = VectorFundef_length(fundefs);
    var uintL i;
    for (i = 0; i < n; i++) {
      fdef = VectorFundef_element(fundefs,i);
      if (String_equals(fdef->packname,packname) && String_equals(fdef->printname,printname))
        goto found;
    }
  }
  # Create the tag.
  {
    var char* initstring = concat3(packname,":",printname);
    var char* tagbuf = (char*) xmalloc(3*strlen(initstring)+10);
    var char* q = tagbuf;
    strcpy(q,"subr_");
    q += strlen(q);
    {
      var const char* p;
      for (p = initstring; *p != '\0'; p++) {
        var char c = *p;
        if (c >= 'A' && c <= 'Z')
          *q++ = c+32;
        else if ((c >= 'a' && c <= 'z') || (c >= '0' && c <= '9'))
          *q++ = c;
        else if (c == ':') {
          *q++ = '_';
          *q++ = '_';
        } else {
          *q++ = '_';
          *q++ = "0123456789ABCDEF"[((unsigned char)c >> 4) & 0x0F];
          *q++ = "0123456789ABCDEF"[(unsigned char)c & 0x0F];
        }
      }
    }
    *q = '\0';
    if (get_fundef_from_tag(tagbuf) != NULL) {
      var int i;
      # Append a suffix to make sure tags are unique.
      for (i = 1; ; i++) {
        sprintf(q,"_%d",i);
        if (get_fundef_from_tag(tagbuf) == NULL)
          break;
      }
    }
    # Found a unique tag. Allocate a new Fundef.
    {
      var char* tag = (char*) xmalloc(strlen(tagbuf)+1);
      strcpy(tag,tagbuf);
      xfree(tagbuf);
      fdef = (Fundef*) xmalloc(sizeof(Fundef));
      fdef->packname = packname;
      fdef->printname = printname;
      fdef->tag = tag;
      fdef->condition = make_StackVectorString();
      fdef->signatures = make_VectorSignature();
      VectorFundef_add(fundefs,fdef);
    }
  }
found:
  StackVectorString_push_optimize(fdef->condition,condition);
  # Now add the signature.
  {
    var VectorSignature* signatures = fdef->signatures;
    var uintL n = VectorSignature_length(signatures);
    var uintL i;
    for (i = 0; i < n; i++) {
      var Signature* sig_i = VectorSignature_element(signatures,i);
      if (Signature_equals(sig_i,sig)) {
        StackVectorString_push_optimize(sig_i->condition,condition);
        goto done_signature;
      }
    }
    sig->condition = make_StackVectorString();
    StackVectorString_push_optimize(sig->condition,condition);
    VectorSignature_add(signatures,sig);
  }
done_signature:
  return fdef;
}

local inline Fundef* get_fundef (const char* funname, Signature* sig)
{
  return get_fundef_aux(funname,sig,current_condition());
}


# Print a signature in a form suitable as argument list for LISPFUN.

local char* get_signature_for_LISPFUN (const Fundef* fdef, const Signature* sig)
{
  # sprintf(buffer,"(%s,%d,%d,%s,%s,%lu,NIL)",
  #                fdef->tag,
  #                sig->req,
  #                sig->opt,
  #                (sig->rest?"rest":"norest"),
  #                (sig->key?"key":"nokey"),
  #                VectorObjdef_length(sig->keywords));
  var char buffer[1+10+1+10+1+6+1+5+10+5+1];
  sprintf(buffer,",%d,%d,%s,%s,%lu,NIL)",
                 sig->req,
                 sig->opt,
                 (sig->rest?"rest":"norest"),
                 (sig->key?"key":"nokey"),
                 VectorObjdef_length(sig->keywords));
  return concat3("(",fdef->tag,buffer);
}


# Parse a  DEFUN(funname,lambdalist)  line,
# and turn it into  DEFUN(funname,lambdalist,signature).

local char* is_defun (const char* line) {
  var uintL n = strlen(line);
  var uintL i = 0;
  # Skip whitespace.
  for (; i < n && is_whitespace(line[i]); i++);
  # Check for "DEFUN".
  if (i+5 < n
      && line[i+0] == 'D'
      && line[i+1] == 'E'
      && line[i+2] == 'F'
      && line[i+3] == 'U'
      && line[i+4] == 'N'
      && (is_whitespace(line[i+5]) || line[i+5] == '(')) {
    i += 5;
    for (; i < n && is_whitespace(line[i]); i++);
    if (i < n && line[i] == '(') {
      var uintL i1, i2, i3, i4;
      i += 1;
      i1 = i;
      for (; i < n; i++)
        if (line[i] == ',' || line[i] == '(' || line[i] == ')')
          break;
      i2 = i;
      if (i < n && line[i] == ',') {
        i += 1;
        i3 = i;
        for (; i < n; i++)
          if (line[i] == ',' || line[i] == '(' || line[i] == ')')
            break;
        i4 = i;
        if (i < n && line[i] == ')') {
          # First macro argument is from i1 to i2, second is from i3 to i4.
          while (i1 < i2 && is_whitespace(line[i1])) i1++;
          while (i1 < i2 && is_whitespace(line[i2-1])) i2--;
          {
            var char* funname = substring(line,i1,i2);
            var char* lambdalist = substring(line,i3,i4);
            var Signature* signature = parseSignature(lambdalist);
            if (signature == NULL) {
              fprintf(stderr,"%s:%ld: invalid lambdalist syntax for function `%s': %s\n",file,lineno,funname,lambdalist);
              exit(1);
            }
            {
              var Fundef* fdef = get_fundef(funname,signature);
              return concat4(substring(line,0,i),",",get_signature_for_LISPFUN(fdef,signature),substring(line,i,n));
            }
          }
        }
      }
    }
    fprintf(stderr,"%s:%ld: invalid DEFUN macro syntax: %s\n",file,lineno,line);
    exit(1);
  }
  return NULL;
}


# Entries for the variable table.

typedef struct {
  const char* tag;              # The struct tag of this variable.
  StackVectorString* condition; # The total #if condition of this variable.
} Vardef;


# A vector of Vardef.

typedef struct {
  Vector rep;
} VectorVardef;

local inline void VectorVardef_init (VectorVardef* v)
{
  Vector_init(&v->rep);
}

local VectorVardef* make_VectorVardef ()
{
  var VectorVardef* v = (VectorVardef*) xmalloc(sizeof(VectorVardef));
  VectorVardef_init(v);
  return v;
}

local inline uintL VectorVardef_length (const VectorVardef* v)
{
  return Vector_length(&v->rep);
}

local inline void VectorVardef_add (VectorVardef* v, Vardef* elt)
{
  Vector_add(&v->rep,elt);
}

local inline Vardef* VectorVardef_element (const VectorVardef* v, uintL i)
{
  return (Vardef*) Vector_element(&v->rep,i);
}

local inline void VectorVardef_set_element (VectorVardef* v, uintL i, Vardef* elt)
{
  Vector_set_element(&v->rep,i,elt);
}


# The table of all Vardefs.

local VectorVardef* vardefs;


# Looks up an Vardef with a given tag.

local Vardef* get_vardef_from_tag (const char* tag)
{
  var uintL n = VectorVardef_length(vardefs);
  var uintL i;
  for (i = 0; i < n; i++) {
    var Vardef* vdef = VectorVardef_element(vardefs,i);
    if (String_equals(vdef->tag,tag))
      return vdef;
  }
  return NULL;
}

# Looks up or creates a Vardef for a given variable name.

local Vardef* get_vardef_aux (const char* varname, VectorString* condition)
{
  var Vardef* vdef;
  # First search in the table.
  vdef = get_vardef_from_tag(varname);
  if (vdef == NULL) {
    # Allocate a new Vardef.
    vdef = (Vardef*) xmalloc(sizeof(Vardef));
    vdef->tag = varname;
    vdef->condition = make_StackVectorString();
    VectorVardef_add(vardefs,vdef);
  }
  StackVectorString_push_optimize(vdef->condition,condition);
  return vdef;
}

local inline Vardef* get_vardef (const char* varname)
{
  return get_vardef_aux(varname,current_condition());
}


# Variable initializers. (We treat them separately from the variables
# themselves, so that they are executed in order.)

typedef struct {
  const char* tag;         # The struct tag of this variable.
  const char* initform;    # A C expression initializing this variable.
  VectorString* condition; # The #if condition of this initializer.
} Varinit;

local inline Varinit* make_Varinit (const char* tag, const char* initform, VectorString* condition)
{
  var Varinit* v = (Varinit*) xmalloc(sizeof(Varinit));
  v->tag = tag;
  v->initform = initform;
  v->condition = condition;
  return v;
}


# A vector of Varinit.

typedef struct {
  Vector rep;
} VectorVarinit;

local inline void VectorVarinit_init (VectorVarinit* v)
{
  Vector_init(&v->rep);
}

local VectorVarinit* make_VectorVarinit ()
{
  var VectorVarinit* v = (VectorVarinit*) xmalloc(sizeof(VectorVarinit));
  VectorVarinit_init(v);
  return v;
}

local inline uintL VectorVarinit_length (const VectorVarinit* v)
{
  return Vector_length(&v->rep);
}

local inline void VectorVarinit_add (VectorVarinit* v, Varinit* elt)
{
  Vector_add(&v->rep,elt);
}

local inline Varinit* VectorVarinit_element (const VectorVarinit* v, uintL i)
{
  return (Varinit*) Vector_element(&v->rep,i);
}

local inline void VectorVarinit_set_element (VectorVarinit* v, uintL i, Varinit* elt)
{
  Vector_set_element(&v->rep,i,elt);
}


# The list of all variable initializers, as they appear in the source.

local VectorVarinit* varinits;


# Parse a  DEFVAR(varname,initform)  line, and turn it into  DEFVAR(varname).
# (We remove the initform because it might contain backquoted stuff including
# commas and parentheses.)

local char* is_defvar (const char* line) {
  var uintL n = strlen(line);
  var uintL i = 0;
  # Skip whitespace.
  for (; i < n && is_whitespace(line[i]); i++);
  # Check for "DEFVAR".
  if (i+6 < n
      && line[i+0] == 'D'
      && line[i+1] == 'E'
      && line[i+2] == 'F'
      && line[i+3] == 'V'
      && line[i+4] == 'A'
      && line[i+5] == 'R'
      && (is_whitespace(line[i+6]) || line[i+6] == '(')) {
    i += 6;
    for (; i < n && is_whitespace(line[i]); i++);
    if (i < n && line[i] == '(') {
      var uintL i1, i2, i3, i4;
      i += 1;
      i1 = i;
      for (; i < n; i++)
        if (line[i] == ',' || line[i] == '(' || line[i] == ')')
          break;
      i2 = i;
      if (i < n && line[i] == ',') {
        i += 1;
        i3 = i;
        # Start a lexical analysis.
        {
          var int in_comment = 0; # comment depth
          var boolean in_string = FALSE; # in "..." ?
          var boolean in_char = FALSE;   # in '...' ?
          var boolean in_subst = FALSE;  # in `...` ?
          var long subst_start = -1;
          var int in_paren = 0;   # parentheses depth
          while (i < n) {
            var char c = line[i];
            if (!in_comment && !in_char && !in_string && !in_subst
                && c == '(') {
              in_paren++;
              i++;
            } else if (!in_comment && !in_char && !in_string && !in_subst
                       && !in_paren && c == ',') {
              fprintf(stderr,"%s:%ld: DEFVAR macro with two many arguments\n",file,lineno);
              exit(1);
            } else if (!in_comment && !in_char && !in_string && !in_subst
                       && c == ')') {
              if (in_paren > 0) {
                in_paren--;
                i++;
              } else
                break;
            } else if (!in_char && !in_string && !in_subst
                       && i+1 < n && c == '/' && line[i+1] == '*') {
              in_comment++;
              i += 2;
            } else if (!in_char && !in_string && !in_subst
                       && i+1 < n && c == '*' && line[i+1] == '/') {
              in_comment--;
              if (in_comment < 0)
                in_comment = 0;
              i += 2;
            } else if (i+1 < n && c == '\\') {
              if (in_subst && line[i+1] == '`') {
                # Inside subst, convert \` to simple `
                line = concat2(substring(line,0,i),substring(line,i+1,n));
                n--;
                i++;
              } else
                i += 2;
            } else if (!in_comment && !in_char && !in_subst && c == '"') {
              in_string = !in_string;
              i++;
            } else if (!in_comment && !in_string && !in_subst && c == '\'') {
              in_char = !in_char;
              i++;
            } else if (!in_comment && !in_char && !in_string && c == '`') {
              if (!in_subst) {
                in_subst = TRUE;
                subst_start = i;
                i++;
              } else {
                var const char* initstring = substring(line,subst_start+1,i);
                var Objdef* odef = get_objdef(initstring);
                line = concat3(substring(line,0,subst_start),odef->tag,substring(line,i+1,n));
                n = strlen(line);
                i = subst_start + strlen(odef->tag);
                in_subst = FALSE;
                subst_start = -1;
              }
            } else
              i++;
          }
          if (i == n) {
            if (in_string) {
              fprintf(stderr,"%s:%ld: string not terminated\n",file,lineno);
              exit(1);
            }
            if (in_char) {
              fprintf(stderr,"%s:%ld: character not terminated\n",file,lineno);
              exit(1);
            }
            if (in_subst) {
              fprintf(stderr,"%s:%ld: backquote not terminated\n",file,lineno);
              exit(1);
            }
            if (in_comment) {
              fprintf(stderr,"%s:%ld: comment inside DEFVAR not terminated\n",file,lineno);
              exit(1);
            }
            fprintf(stderr,"%s:%ld: DEFVAR macro not terminated\n",file,lineno);
            exit(1);
          }
        }
        i4 = i;
        # First macro argument is from i1 to i2, second is from i3 to i4.
        while (i1 < i2 && is_whitespace(line[i1])) i1++;
        while (i1 < i2 && is_whitespace(line[i2-1])) i2--;
        {
          var char* varname = substring(line,i1,i2);
          var Vardef* vdef = get_vardef(varname);
          VectorVarinit_add(varinits,make_Varinit(vdef->tag,substring(line,i3,i4),current_condition()));
          # Remove the second macro argument.
          return concat2(substring(line,0,i3-1),substring(line,i4,n));
        }
      }
    }
    fprintf(stderr,"%s:%ld: invalid DEFVAR macro syntax: %s\n",file,lineno,line);
    exit(1);
  }
  return NULL;
}


# Parse the entire input.

local void parse ()
{
  # Initialize variables.
  ifdef_stack = make_StackVectorString();
  objdefs = make_VectorObjdef();
  fundefs = make_VectorFundef();
  vardefs = make_VectorVardef();
  varinits = make_VectorVarinit();
  {
    var int in_comment = 0; # comment depth
    var boolean in_string = FALSE; # in "..." ?
    var boolean in_char = FALSE;   # in '...' ?
    var boolean in_subst = FALSE;  # in `...` ?
    var long subst_start = -1;
    var int m = VectorLine_length(lines);
    var int j;
    for (j = 0; j < m; j++) {
      var char* line = VectorLine_element(lines,j)->contents;
      lineno = VectorLine_element(lines,j)->number;
      if (in_comment == 0) {
        # Check for DEFMODULE.
        if (is_defmodule(line))
          line_defmodule = j;
        # Check for preprocessor commands.
        {
          var const char* condition;
          if ((condition = is_if(line)) != NULL)
            do_if(condition);
          else if (is_else(line))
            do_else();
          else if ((condition = is_elif(line)) != NULL)
            do_elif(condition);
          else if (is_endif(line))
            do_endif();
        }
        # Check for DEFUN.
        {
          var char* expanded_line = is_defun(line);
          if (expanded_line != NULL)
            line = expanded_line;
        }
        # Check for DEFVAR.
        {
          var char* expanded_line = is_defvar(line);
          if (expanded_line != NULL)
            line = expanded_line;
        }
      }
      # General lexical analysis of the line.
      {
        var uintL n = strlen(line);
        var uintL i;
        for (i = 0; i < n; ) {
          var char c = line[i];
          if (!in_char && !in_string && !in_subst
              && i+1 < n && c == '/' && line[i+1] == '*') {
            in_comment++;
            i += 2;
          } else if (!in_char && !in_string && !in_subst
                     && i+1 < n && c == '*' && line[i+1] == '/') {
            in_comment--;
            if (in_comment < 0)
              in_comment = 0;
            i += 2;
          } else if (i+1 < n && c == '\\') {
            if (in_subst && line[i+1] == '`') {
              # Inside subst, convert \` to simple `
              line = concat2(substring(line,0,i),substring(line,i+1,n));
              n--;
              i++;
            } else
              i += 2;
          } else if (!in_comment && !in_char && !in_subst && c == '"') {
            in_string = !in_string;
            i++;
          } else if (!in_comment && !in_string && !in_subst && c == '\'') {
            in_char = !in_char;
            i++;
          } else if (!in_comment && !in_char && !in_string && c == '`') {
            if (!in_subst) {
              in_subst = TRUE;
              subst_start = i;
              i++;
            } else {
              var const char* initstring = substring(line,subst_start+1,i);
              var Objdef* odef = get_objdef(initstring);
              line = concat3(substring(line,0,subst_start),odef->tag,substring(line,i+1,n));
              n = strlen(line);
              i = subst_start + strlen(odef->tag);
              in_subst = FALSE;
              subst_start = -1;
            }
          } else
            i++;
        }
      }
      VectorLine_element(lines,j)->contents = line;
      if (in_string) {
        fprintf(stderr,"%s:%ld: string not terminated\n",file,lineno);
        exit(1);
      }
      if (in_char) {
        fprintf(stderr,"%s:%ld: character not terminated\n",file,lineno);
        exit(1);
      }
      if (in_subst) {
        fprintf(stderr,"%s:%ld: backquote not terminated\n",file,lineno);
        exit(1);
      }
    }
  }
}


# ================================== OUTPUT =================================


# Print a list (cond1 && cond2 && ...) to a stream.
local void print_condition_part (FILE* stream, const VectorString* condition)
{
  var uintL n = VectorString_length(condition);
  if (n == 0) {
    fprintf(stream,"1");
    return;
  }
  if (n == 1) {
    fprintf(stream,"%s",VectorString_element(condition,0));
    return;
  }
  {
    var uintL i;
    for (i = 0; i < n; i++) {
      if (i > 0)
        fprintf(stream," && ");
      fprintf(stream,"(%s)",VectorString_element(condition,i));
    }
  }
}

# Tests whether a condition is equivalent to 1 (true).
local inline boolean is_true_condition_part (VectorString* condition)
{
  var uintL n = VectorString_length(condition);
  return (n == 0);
}

# Print a list of lists (cond1 || cond2 || ...) to a stream.
local void print_condition (FILE* stream, StackVectorString* condition)
{
  var uintL n = StackVectorString_length(condition);
  if (n == 0) {
    fprintf(stream,"0");
    return;
  }
  if (n == 1) {
    print_condition_part(stream,StackVectorString_element(condition,0));
    return;
  }
  {
    var uintL i;
    for (i = 0; i < n; i++) {
      if (i > 0)
        fprintf(stream," || ");
      fprintf(stream,"(");
      print_condition_part(stream,StackVectorString_element(condition,i));
      fprintf(stream,")");
    }
  }
}

# Tests whether a condition is equivalent to 0 (false).
local inline boolean is_false_condition (StackVectorString* condition)
{
  var uintL n = StackVectorString_length(condition);
  return (n == 0);
}

# Tests whether a condition is equivalent to 1 (true).
local boolean is_true_condition (StackVectorString* condition)
{
  var uintL n = StackVectorString_length(condition);
  var uintL i;
  for (i = 0; i < n; i++)
    if (is_true_condition_part(StackVectorString_element(condition,i)))
      return TRUE;
  return FALSE;
}

# Prints a newline. Don't print a "\n" directly!
local inline void print_nl (FILE* stream)
{
  fprintf(stream,"\n");
  lineno++;
}

# Prints a string in C syntax.
local void print_C_string (FILE* stream, const char* data)
{
  putc('"',stream);
  for (; *data != '\0'; data++) {
    var char c = *data;
    if (c == '"' || c == '\\')
      putc('\\',stream);
    putc(c,stream);
  }
  putc('"',stream);
}

# Output the tables just after the DEFMODULE line.
local void output_tables1 (FILE* stream)
{
  var const char* modname = name_defmodule;
  var const char* object_tab = concat3("module__",modname,"__object_tab");
  var const char* object_tab_initdata = concat3("module__",modname,"__object_tab_initdata");
  fprintf(stream,"#define O(varname) %s._##varname",object_tab);
  print_nl(stream);
  print_nl(stream);
  fprintf(stream,"struct {");
  print_nl(stream);
  {
    var uintL n = VectorObjdef_length(objdefs);
    var uintL i;
    for (i = 0; i < n; i++) {
      var Objdef* odef = VectorObjdef_element(objdefs,i);
      if (!is_false_condition(odef->condition)) {
        if (!is_true_condition(odef->condition)) {
          fprintf(stream,"#if ");
          print_condition(stream,odef->condition);
          print_nl(stream);
        }
        fprintf(stream,"  object _%s;",odef->tag);
        print_nl(stream);
        if (!is_true_condition(odef->condition)) {
          fprintf(stream,"#endif");
          print_nl(stream);
        }
      }
    }
  }
  {
    var uintL n = VectorVardef_length(vardefs);
    var uintL i;
    for (i = 0; i < n; i++) {
      var Vardef* vdef = VectorVardef_element(vardefs,i);
      if (!is_false_condition(vdef->condition)) {
        if (!is_true_condition(vdef->condition)) {
          fprintf(stream,"#if ");
          print_condition(stream,vdef->condition);
          print_nl(stream);
        }
        fprintf(stream,"  object _%s;",vdef->tag);
        print_nl(stream);
        if (!is_true_condition(vdef->condition)) {
          fprintf(stream,"#endif");
          print_nl(stream);
        }
      }
    }
  }
  fprintf(stream,"} %s;",object_tab);
  print_nl(stream);
  {
    var uintL n = VectorObjdef_length(objdefs);
    var uintL i;
    for (i = 0; i < n; i++) {
      var Objdef* odef = VectorObjdef_element(objdefs,i);
      if (!is_false_condition(odef->condition)) {
        fprintf(stream,"#define %s  %s._%s",odef->tag,object_tab,odef->tag);
        print_nl(stream);
      }
    }
  }
  fprintf(stream,"uintC module__%s__object_tab_size = sizeof(%s)/sizeof(object);",modname,object_tab);
  print_nl(stream);
  print_nl(stream);
  fprintf(stream,"struct {");
  print_nl(stream);
  {
    var uintL n = VectorObjdef_length(objdefs);
    var uintL i;
    for (i = 0; i < n; i++) {
      var Objdef* odef = VectorObjdef_element(objdefs,i);
      if (!is_false_condition(odef->condition)) {
        if (!is_true_condition(odef->condition)) {
          fprintf(stream,"#if ");
          print_condition(stream,odef->condition);
          print_nl(stream);
        }
        fprintf(stream,"  object_initdata _%s;",odef->tag);
        print_nl(stream);
        if (!is_true_condition(odef->condition)) {
          fprintf(stream,"#endif");
          print_nl(stream);
        }
      }
    }
  }
  {
    var uintL n = VectorVardef_length(vardefs);
    var uintL i;
    for (i = 0; i < n; i++) {
      var Vardef* vdef = VectorVardef_element(vardefs,i);
      if (!is_false_condition(vdef->condition)) {
        if (!is_true_condition(vdef->condition)) {
          fprintf(stream,"#if ");
          print_condition(stream,vdef->condition);
          print_nl(stream);
        }
        fprintf(stream,"  object_initdata _%s;",vdef->tag);
        print_nl(stream);
        if (!is_true_condition(vdef->condition)) {
          fprintf(stream,"#endif");
          print_nl(stream);
        }
      }
    }
  }
  fprintf(stream,"  int _dummy_to_avoid_trailing_comma_in_initializer;");
  print_nl(stream);
  fprintf(stream,"} %s = {",object_tab_initdata);
  print_nl(stream);
  {
    var uintL n = VectorObjdef_length(objdefs);
    var uintL i;
    for (i = 0; i < n; i++) {
      var Objdef* odef = VectorObjdef_element(objdefs,i);
      if (!is_false_condition(odef->condition)) {
        if (!is_true_condition(odef->condition)) {
          fprintf(stream,"#if ");
          print_condition(stream,odef->condition);
          print_nl(stream);
        }
        fprintf(stream,"  { ");
        print_C_string(stream,odef->initstring);
        fprintf(stream," },");
        print_nl(stream);
        if (!is_true_condition(odef->condition)) {
          fprintf(stream,"#endif");
          print_nl(stream);
        }
      }
    }
  }
  {
    var uintL n = VectorVardef_length(vardefs);
    var uintL i;
    for (i = 0; i < n; i++) {
      var Vardef* vdef = VectorVardef_element(vardefs,i);
      if (!is_false_condition(vdef->condition)) {
        if (!is_true_condition(vdef->condition)) {
          fprintf(stream,"#if ");
          print_condition(stream,vdef->condition);
          print_nl(stream);
        }
        fprintf(stream,"  { ");
        print_C_string(stream,"NIL");
        fprintf(stream," },");
        print_nl(stream);
        if (!is_true_condition(vdef->condition)) {
          fprintf(stream,"#endif");
          print_nl(stream);
        }
      }
    }
  }
  fprintf(stream,"  0");
  print_nl(stream);
  fprintf(stream,"};");
  print_nl(stream);
  print_nl(stream);
}

# Output the tables at the end of the file.
local void output_tables2 (FILE* stream)
{
  var const char* modname = name_defmodule;
  var const char* subr_tab = concat3("module__",modname,"__subr_tab");
  var const char* subr_tab_initdata = concat3("module__",modname,"__subr_tab_initdata");
  print_nl(stream);
  fprintf(stream,"struct {");
  print_nl(stream);
  {
    var uintL n = VectorFundef_length(fundefs);
    var uintL i;
    for (i = 0; i < n; i++) {
      var Fundef* fdef = VectorFundef_element(fundefs,i);
      if (!is_false_condition(fdef->condition)) {
        if (!is_true_condition(fdef->condition)) {
          fprintf(stream,"#if ");
          print_condition(stream,fdef->condition);
          print_nl(stream);
        }
        fprintf(stream,"  subr_ _%s;",fdef->tag);
        print_nl(stream);
        if (!is_true_condition(fdef->condition)) {
          fprintf(stream,"#endif");
          print_nl(stream);
        }
      }
    }
  }
  fprintf(stream,"  int _dummy_to_avoid_trailing_comma_in_initializer;");
  print_nl(stream);
  fprintf(stream,"} %s = {",subr_tab);
  print_nl(stream);
  {
    var uintL n = VectorFundef_length(fundefs);
    var uintL i;
    for (i = 0; i < n; i++) {
      var Fundef* fdef = VectorFundef_element(fundefs,i);
      var VectorSignature* signatures = fdef->signatures;
      var uintL m = VectorSignature_length(signatures);
      var uintL j;
      for (j = 0; j < m; j++) {
        var Signature* sig = VectorSignature_element(signatures,j);
        if (!is_false_condition(sig->condition)) {
          if (!is_true_condition(sig->condition)) {
            fprintf(stream,"#if ");
            print_condition(stream,sig->condition);
            print_nl(stream);
          }
          fprintf(stream,"  LISPFUN_F%s",get_signature_for_LISPFUN(fdef,sig));
          print_nl(stream);
          if (!is_true_condition(sig->condition)) {
            fprintf(stream,"#endif");
            print_nl(stream);
          }
        }
      }
    }
  }
  fprintf(stream,"  0");
  print_nl(stream);
  fprintf(stream,"};");
  print_nl(stream);
  fprintf(stream,"uintC module__%s__subr_tab_size = ((char*)&%s._dummy_to_avoid_trailing_comma_in_initializer-(char*)&%s)/sizeof(subr_);",modname,subr_tab,subr_tab);
  print_nl(stream);
  print_nl(stream);
  fprintf(stream,"struct {");
  print_nl(stream);
  {
    var uintL n = VectorFundef_length(fundefs);
    var uintL i;
    for (i = 0; i < n; i++) {
      var Fundef* fdef = VectorFundef_element(fundefs,i);
      if (!is_false_condition(fdef->condition)) {
        if (!is_true_condition(fdef->condition)) {
          fprintf(stream,"#if ");
          print_condition(stream,fdef->condition);
          print_nl(stream);
        }
        fprintf(stream,"  subr_initdata _%s;",fdef->tag);
        print_nl(stream);
        if (!is_true_condition(fdef->condition)) {
          fprintf(stream,"#endif");
          print_nl(stream);
        }
      }
    }
  }
  fprintf(stream,"  int _dummy_to_avoid_trailing_comma_in_initializer;");
  print_nl(stream);
  fprintf(stream,"} %s = {",subr_tab_initdata);
  print_nl(stream);
  {
    var uintL n = VectorFundef_length(fundefs);
    var uintL i;
    for (i = 0; i < n; i++) {
      var Fundef* fdef = VectorFundef_element(fundefs,i);
      if (!is_false_condition(fdef->condition)) {
        if (!is_true_condition(fdef->condition)) {
          fprintf(stream,"#if ");
          print_condition(stream,fdef->condition);
          print_nl(stream);
        }
        fprintf(stream,"  { ");
        print_C_string(stream,fdef->packname);
        fprintf(stream,", ");
        print_C_string(stream,fdef->printname);
        fprintf(stream," },");
        print_nl(stream);
        if (!is_true_condition(fdef->condition)) {
          fprintf(stream,"#endif");
          print_nl(stream);
        }
      }
    }
  }
  fprintf(stream,"  0");
  print_nl(stream);
  fprintf(stream,"};");
  print_nl(stream);
  print_nl(stream);
  fprintf(stream,"void module__%s__init_function_1 (module_* module)",modname);
  print_nl(stream);
  fprintf(stream,"{");
  print_nl(stream);
  {
    var uintL n = VectorFundef_length(fundefs);
    var uintL i;
    for (i = 0; i < n; i++) {
      var Fundef* fdef = VectorFundef_element(fundefs,i);
      var VectorSignature* signatures = fdef->signatures;
      var uintL m = VectorSignature_length(signatures);
      var uintL j;
      for (j = 0; j < m; j++) {
        var Signature* sig = VectorSignature_element(signatures,j);
        if (sig->key) {
          if (!is_false_condition(sig->condition)) {
            if (!is_true_condition(sig->condition)) {
              fprintf(stream,"#if ");
              print_condition(stream,sig->condition);
              print_nl(stream);
            }
            {
              var uintL o = VectorObjdef_length(sig->keywords);
              var uintL k;
              for (k = 0; k < o; k++) {
                fprintf(stream,"  pushSTACK(%s);",VectorObjdef_element(sig->keywords,k)->tag);
                print_nl(stream);
              }
              fprintf(stream,"  %s._%s.keywords = vectorof(%lu);",subr_tab,fdef->tag,o);
              print_nl(stream);
            }
            if (!is_true_condition(sig->condition)) {
              fprintf(stream,"#endif");
              print_nl(stream);
            }
          }
        }
      }
    }
  }
  {
    var uintL n = VectorVarinit_length(varinits);
    var uintL i;
    for (i = 0; i < n; i++) {
      var Varinit* vinit = VectorVarinit_element(varinits,i);
      if (!is_true_condition_part(vinit->condition)) {
        fprintf(stream,"#if ");
        print_condition_part(stream,vinit->condition);
        print_nl(stream);
      }
      fprintf(stream,"  O(%s) = (%s);",vinit->tag,vinit->initform);
      print_nl(stream);
      if (!is_true_condition_part(vinit->condition)) {
        fprintf(stream,"#endif");
        print_nl(stream);
      }
    }
  }
  fprintf(stream,"}");
  print_nl(stream);
  print_nl(stream);
  fprintf(stream,"void module__%s__init_function_2 (module_* module)",modname);
  print_nl(stream);
  fprintf(stream,"{");
  print_nl(stream);
  fprintf(stream,"}");
  print_nl(stream);
}

# Output everything.
local void output (FILE* stream, const char* infilename)
{
  if (infilename != NULL)
    fprintf(stdout,"#line 1 \"%s\"\n",infilename);
  lineno = 1;
  {
    var uintL m = VectorLine_length(lines);
    var uintL j;
    for (j = 0; j < m; j++) {
      var const Line* line = VectorLine_element(lines,j);
      if (line->number != lineno) {
        fprintf(stream,"#line %ld\n",line->number);
        lineno = line->number;
      }
      fprintf(stream,"%s",line->contents);
      print_nl(stream);
      if (j == line_defmodule)
        output_tables1(stream);
    }
  }
  output_tables2(stream);
}


# =============================== MAIN PROGRAM ==============================

int main (int argc, char* argv[])
{
  var char* infilename;
  var FILE* infile;
  var FILE* outfile;
  # Argument parsing.
  if (argc == 2) {
    infilename = argv[1];
    infile = fopen(infilename,"r");
    if (infile == NULL)
      exit(1);
    file = infilename;
  } else if (argc == 1) {
    infilename = NULL;
    infile = stdin;
  } else
    exit(1);
  outfile = stdout;
  # Main job.
  read_all_input(infile);
  parse();
  output(stdout,infilename);
  # Clean up.
  if (ferror(infile) || ferror(outfile)) {
    fclose(infile);
    fclose(outfile);
    exit(1);
  }
  fclose(infile);
  fclose(outfile);
  exit(0);
}