movs, rol, reg save, esp frame..

[ia32rtools.git] / tools / translate.c

#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "my_assert.h"
#include "my_str.h"

#define ARRAY_SIZE(x) (sizeof(x) / sizeof(x[0]))
#define IS(w, y) !strcmp(w, y)

#include "protoparse.h"

const char *asmfn;
static int asmln;

#define anote(fmt, ...) \
	printf("%s:%d: note: " fmt, asmfn, asmln, ##__VA_ARGS__)
#define awarn(fmt, ...) \
	printf("%s:%d: warning: " fmt, asmfn, asmln, ##__VA_ARGS__)
#define aerr(fmt, ...) do { \
	printf("%s:%d: error: " fmt, asmfn, asmln, ##__VA_ARGS__); \
  fcloseall(); \
	exit(1); \
} while (0)

enum op_flags {
  OPF_RMD    = (1 << 0), /* removed or optimized out */
  OPF_DATA   = (1 << 1), /* data processing - writes to dst opr */
  OPF_FLAGS  = (1 << 2), /* sets flags */
  OPF_JMP    = (1 << 3), /* branches, ret and call */
  OPF_CC     = (1 << 4), /* uses flags */
  OPF_TAIL   = (1 << 5), /* ret or tail call */
  OPF_REP    = (1 << 6), /* prefixed by rep */
  OPF_RSAVE  = (1 << 7), /* push/pop is local reg save/load */
};

enum op_op {
	OP_INVAL,
	OP_NOP,
	OP_PUSH,
	OP_POP,
	OP_MOV,
	OP_LEA,
	OP_MOVZX,
	OP_MOVSX,
	OP_NOT,
	OP_CDQ,
	OP_STOS,
	OP_MOVS,
	OP_RET,
	OP_ADD,
	OP_SUB,
	OP_AND,
	OP_OR,
	OP_XOR,
	OP_SHL,
	OP_SHR,
	OP_SAR,
	OP_ROL,
	OP_ROR,
	OP_ADC,
	OP_SBB,
	OP_INC,
	OP_DEC,
	OP_NEG,
	OP_MUL,
	OP_IMUL,
	OP_DIV,
	OP_IDIV,
	OP_TEST,
	OP_CMP,
	OP_CALL,
	OP_JMP,
	OP_JO,
	OP_JNO,
	OP_JC,
	OP_JNC,
	OP_JZ,
	OP_JNZ,
	OP_JBE,
	OP_JA,
	OP_JS,
	OP_JNS,
	OP_JP,
	OP_JNP,
	OP_JL,
	OP_JGE,
	OP_JLE,
	OP_JG,
};

enum opr_type {
  OPT_UNSPEC,
  OPT_REG,
  OPT_REGMEM,
  OPT_LABEL,
  OPT_OFFSET,
  OPT_CONST,
};

enum opr_lenmod {
	OPLM_UNSPEC,
	OPLM_BYTE,
	OPLM_WORD,
	OPLM_DWORD,
};

#define MAX_OPERANDS 3

struct parsed_opr {
  enum opr_type type;
  enum opr_lenmod lmod;
  int reg;
  unsigned int val;
  char name[256];
};

struct parsed_op {
  enum op_op op;
  struct parsed_opr operand[MAX_OPERANDS];
  unsigned int flags;
  int operand_cnt;
  int regmask_src;        // all referensed regs
  int regmask_dst;
  int pfomask;            // flagop: parsed_flag_op that can't be delayed
  int argmask;            // push: args that are altered before call
  int cc_scratch;         // scratch storage during analysis
  int bt_i;               // branch target (for branches)
  struct parsed_op *lrl;  // label reference list entry
  void *datap;
};

// datap:
// OP_CALL - ptr to parsed_proto
// (OPF_CC) - point to corresponding (OPF_FLAGS)

struct parsed_equ {
  char name[64];
  enum opr_lenmod lmod;
  int offset;
};

#define MAX_OPS 1024

static struct parsed_op ops[MAX_OPS];
static struct parsed_equ *g_eqs;
static int g_eqcnt;
static char g_labels[MAX_OPS][32];
static struct parsed_op *g_label_refs[MAX_OPS];
static struct parsed_proto g_func_pp;
static char g_func[256];
static char g_comment[256];
static int g_bp_frame;
static int g_bp_stack;
#define ferr(op_, fmt, ...) do { \
  printf("error:%s:#%ld: '%s': " fmt, g_func, (op_) - ops, \
    dump_op(op_), ##__VA_ARGS__); \
  fcloseall(); \
  exit(1); \
} while (0)

#define MAX_REGS 8

const char *regs_r32[] = { "eax", "ebx", "ecx", "edx", "esi", "edi", "ebp", "esp" };
const char *regs_r16[] = { "ax", "bx", "cx", "dx", "si", "di", "bp", "sp" };
const char *regs_r8l[] = { "al", "bl", "cl", "dl" };
const char *regs_r8h[] = { "ah", "bh", "ch", "dh" };

enum x86_regs { xUNSPEC = -1, xAX, xBX, xCX, xDX, xSI, xDI, xBP, xSP };

// possible basic comparison types (without inversion)
enum parsed_flag_op {
  PFO_O,  // 0 OF=1
  PFO_C,  // 2 CF=1
  PFO_Z,  // 4 ZF=1
  PFO_BE, // 6 CF=1||ZF=1
  PFO_S,  // 8 SF=1
  PFO_P,  // a PF=1
  PFO_L,  // c SF!=OF
  PFO_LE, // e ZF=1||SF!=OF
};

static const char *parsed_flag_op_names[] = {
  "o", "c", "z", "be", "s", "p", "l", "le"
};

static int char_array_i(const char *array[], size_t len, const char *s)
{
  int i;

  for (i = 0; i < len; i++)
    if (IS(s, array[i]))
      return i;

  return -1;
}

static void printf_number(char *buf, size_t buf_size, long number)
{
  // output in C-friendly form
  snprintf(buf, buf_size, number < 10 ? "%lu" : "0x%02lx", number);
}

static int parse_reg(enum opr_lenmod *reg_lmod, const char *s)
{
  int reg;

  reg = char_array_i(regs_r32, ARRAY_SIZE(regs_r32), s);
  if (reg >= 0) {
    *reg_lmod = OPLM_DWORD;
    return reg;
  }
  reg = char_array_i(regs_r16, ARRAY_SIZE(regs_r16), s);
  if (reg >= 0) {
    *reg_lmod = OPLM_WORD;
    return reg;
  }
  reg = char_array_i(regs_r8h, ARRAY_SIZE(regs_r8h), s);
  if (reg >= 0) {
    *reg_lmod = OPLM_BYTE;
    return reg;
  }
  reg = char_array_i(regs_r8l, ARRAY_SIZE(regs_r8l), s);
  if (reg >= 0) {
    *reg_lmod = OPLM_BYTE;
    return reg;
  }

  return -1;
}

static long parse_number(const char *number)
{
  int len = strlen(number);
  const char *p = number;
  char *endp = NULL;
  int neg = 0;
  int bad;
  long ret;

  if (*p == '-') {
    neg = 1;
    p++;
  }
  if (len > 1 && *p == '0')
    p++;
  if (number[len - 1] == 'h') {
    ret = strtol(p, &endp, 16);
    bad = (*endp != 'h');
  }
  else {
    ret = strtol(p, &endp, 10);
    bad = (*endp != 0);
  }
  if (bad)
    aerr("number parsing failed\n");
  if (neg)
    ret = -ret;
  return ret;
}

static int parse_indmode(char *name, int *regmask, int need_c_cvt)
{
  enum opr_lenmod lmod;
  char cvtbuf[256];
  char *d = cvtbuf;
  char *s = name;
  char w[64];
  long number;
  int reg;
  int c = 0;

  *d = 0;

  while (*s != 0) {
    d += strlen(d);
    while (my_isblank(*s))
      s++;
    for (; my_issep(*s); d++, s++)
      *d = *s;
    while (my_isblank(*s))
      s++;
    *d = 0;

    // skip 'ds:' prefix
    if (!strncmp(s, "ds:", 3))
      s += 3;

    s = next_idt(w, sizeof(w), s);
    if (w[0] == 0)
      break;
    c++;

    reg = parse_reg(&lmod, w);
    if (reg >= 0) {
      *regmask |= 1 << reg;
      goto pass;
    }

    if ('0' <= w[0] && w[0] <= '9') {
      number = parse_number(w);
      printf_number(d, sizeof(cvtbuf) - (d - cvtbuf), number);
      continue;
    }

    // probably some label/identifier - pass

pass:
    snprintf(d, sizeof(cvtbuf) - (d - cvtbuf), "%s", w);
  }

  if (need_c_cvt)
    strcpy(name, cvtbuf);

  return c;
}

static const char *parse_stack_el(const char *name)
{
  const char *p;
  char buf[32];
  int len;

  if (!strncmp(name, "ebp+", 4)
      && !('0' <= name[4] && name[4] <= '9'))
  {
    return name + 4;
  }
  if (strncmp(name, "esp+", 4) != 0)
    return NULL;

  p = strchr(name + 4, '+');
  if (p) {
    // must be a number after esp+
    if (!('0' <= name[4] && name[4] <= '9'))
      return NULL;
    len = p - (name + 4);
    if (len < sizeof(buf) - 1) {
      strncpy(buf, name + 4, len);
      buf[len] = 0;
      parse_number(buf);
    }
    p++;
  }
  else
    p = name + 4;

  if ('0' <= *p && *p <= '9')
    return NULL;

  return p;
}

static int guess_lmod_from_name(struct parsed_opr *opr)
{
  if (!strncmp(opr->name, "dword_", 6)) {
    opr->lmod = OPLM_DWORD;
    return 1;
  }
  if (!strncmp(opr->name, "word_", 5)) {
    opr->lmod = OPLM_WORD;
    return 1;
  }
  if (!strncmp(opr->name, "byte_", 5)) {
    opr->lmod = OPLM_BYTE;
    return 1;
  }
  return 0;
}

static void setup_reg_opr(struct parsed_opr *opr, int reg, enum opr_lenmod lmod,
  int *regmask)
{
  opr->type = OPT_REG;
  opr->reg = reg;
  opr->lmod = lmod;
  *regmask |= 1 << reg;
}

static struct parsed_equ *equ_find(struct parsed_op *po, const char *name);

static int parse_operand(struct parsed_opr *opr,
  int *regmask, int *regmask_indirect,
	char words[16][256], int wordc, int w, unsigned int op_flags)
{
  enum opr_lenmod tmplmod;
  int ret, len;
  long number;
  int i;

	if (w >= wordc)
		aerr("parse_operand w %d, wordc %d\n", w, wordc);

	opr->reg = xUNSPEC;

	for (i = w; i < wordc; i++) {
		len = strlen(words[i]);
		if (words[i][len - 1] == ',') {
			words[i][len - 1] = 0;
			wordc = i + 1;
			break;
		}
	}

	if (op_flags & OPF_JMP) {
		const char *label;

		if (wordc - w == 3 && IS(words[w + 1], "ptr"))
			label = words[w + 2];
		else if (wordc - w == 2 && IS(words[w], "short"))
			label = words[w + 1];
		else if (wordc - w == 1)
			label = words[w];
		else
			aerr("jump parse error");

		opr->type = OPT_LABEL;
		strcpy(opr->name, label);
		return wordc;
	}

	if (wordc - w >= 3) {
		if (IS(words[w + 1], "ptr")) {
			if (IS(words[w], "dword"))
				opr->lmod = OPLM_DWORD;
			else if (IS(words[w], "word"))
				opr->lmod = OPLM_WORD;
			else if (IS(words[w], "byte"))
				opr->lmod = OPLM_BYTE;
			else
				aerr("type parsing failed\n");
			w += 2;
		}
	}

	if (wordc - w == 2 && IS(words[w], "offset")) {
		opr->type = OPT_OFFSET;
		strcpy(opr->name, words[w + 1]);
		return wordc;
	}

  if (wordc - w != 1)
    aerr("parse_operand 1 word expected\n");

  strcpy(opr->name, words[w]);

  if (words[w][0] == '[') {
    opr->type = OPT_REGMEM;
    ret = sscanf(words[w], "[%[^]]]", opr->name);
    if (ret != 1)
      aerr("[] parse failure\n");

    parse_indmode(opr->name, regmask_indirect, 1);
    if (opr->lmod == OPLM_UNSPEC && parse_stack_el(opr->name)) {
      // might be an equ
      struct parsed_equ *eq =
        equ_find(NULL, parse_stack_el(opr->name));
      if (eq)
        opr->lmod = eq->lmod;
    }
    return wordc;
  }
  else if (strchr(words[w], '[')) {
    // label[reg] form
    opr->type = OPT_REGMEM;
    if (opr->lmod == OPLM_UNSPEC)
      guess_lmod_from_name(opr);
    parse_indmode(strchr(words[w], '['), regmask_indirect, 0);
    return wordc;
  }
  else if (('0' <= words[w][0] && words[w][0] <= '9')
    || words[w][0] == '-')
  {
    number = parse_number(words[w]);
    opr->type = OPT_CONST;
    opr->val = number;
    printf_number(opr->name, sizeof(opr->name), number);
    return wordc;
  }

  ret = parse_reg(&tmplmod, opr->name);
  if (ret >= 0) {
    setup_reg_opr(opr, ret, tmplmod, regmask);
    return wordc;
  }

  // most likely var in data segment
  opr->type = OPT_LABEL;
  if (opr->lmod == OPLM_UNSPEC)
    guess_lmod_from_name(opr);
  if (opr->lmod != OPLM_UNSPEC)
    return wordc;

  // TODO: scan data seg to determine type?
  return wordc;
}

static const struct {
  const char *name;
  unsigned int flags;
} pref_table[] = {
  { "rep",    OPF_REP },
};

static const struct {
  const char *name;
  enum op_op op;
  unsigned int minopr;
  unsigned int maxopr;
  unsigned int flags;
} op_table[] = {
  { "nop",  OP_NOP,    0, 0, 0 },
  { "push", OP_PUSH,   1, 1, 0 },
  { "pop",  OP_POP,    1, 1, OPF_DATA },
  { "mov" , OP_MOV,    2, 2, OPF_DATA },
  { "lea",  OP_LEA,    2, 2, OPF_DATA },
  { "movzx",OP_MOVZX,  2, 2, OPF_DATA },
  { "movsx",OP_MOVSX,  2, 2, OPF_DATA },
  { "not",  OP_NOT,    1, 1, OPF_DATA },
  { "cdq",  OP_CDQ,    0, 0, OPF_DATA },
  { "stosb",OP_STOS,   0, 0, OPF_DATA },
  { "stosw",OP_STOS,   0, 0, OPF_DATA },
  { "stosd",OP_STOS,   0, 0, OPF_DATA },
  { "movsb",OP_MOVS,   0, 0, OPF_DATA },
  { "movsw",OP_MOVS,   0, 0, OPF_DATA },
  { "movsd",OP_MOVS,   0, 0, OPF_DATA },
  { "add",  OP_ADD,    2, 2, OPF_DATA|OPF_FLAGS },
  { "sub",  OP_SUB,    2, 2, OPF_DATA|OPF_FLAGS },
  { "and",  OP_AND,    2, 2, OPF_DATA|OPF_FLAGS },
  { "or",   OP_OR,     2, 2, OPF_DATA|OPF_FLAGS },
  { "xor",  OP_XOR,    2, 2, OPF_DATA|OPF_FLAGS },
  { "shl",  OP_SHL,    2, 2, OPF_DATA|OPF_FLAGS },
  { "shr",  OP_SHR,    2, 2, OPF_DATA|OPF_FLAGS },
  { "sal",  OP_SHL,    2, 2, OPF_DATA|OPF_FLAGS },
  { "sar",  OP_SAR,    2, 2, OPF_DATA|OPF_FLAGS },
  { "rol",  OP_ROL,    2, 2, OPF_DATA|OPF_FLAGS },
  { "ror",  OP_ROR,    2, 2, OPF_DATA|OPF_FLAGS },
  { "adc",  OP_ADC,    2, 2, OPF_DATA|OPF_FLAGS|OPF_CC },
  { "sbb",  OP_SBB,    2, 2, OPF_DATA|OPF_FLAGS|OPF_CC },
  { "inc",  OP_INC,    1, 1, OPF_DATA|OPF_FLAGS },
  { "dec",  OP_DEC,    1, 1, OPF_DATA|OPF_FLAGS },
  { "neg",  OP_NEG,    1, 1, OPF_DATA|OPF_FLAGS },
  { "mul",  OP_MUL,    1, 1, OPF_DATA|OPF_FLAGS },
  { "imul", OP_IMUL,   1, 3, OPF_DATA|OPF_FLAGS },
  { "div",  OP_DIV,    1, 1, OPF_DATA|OPF_FLAGS },
  { "idiv", OP_IDIV,   1, 1, OPF_DATA|OPF_FLAGS },
  { "test", OP_TEST,   2, 2, OPF_FLAGS },
  { "cmp",  OP_CMP,    2, 2, OPF_FLAGS },
  { "retn", OP_RET,    0, 1, OPF_JMP|OPF_TAIL },
  { "call", OP_CALL,   1, 1, OPF_JMP|OPF_FLAGS },
  { "jmp",  OP_JMP,    1, 1, OPF_JMP },
  { "jo",   OP_JO,     1, 1, OPF_JMP|OPF_CC }, // 70 OF=1
  { "jno",  OP_JNO,    1, 1, OPF_JMP|OPF_CC }, // 71 OF=0
  { "jc",   OP_JC,     1, 1, OPF_JMP|OPF_CC }, // 72 CF=1
  { "jb",   OP_JC,     1, 1, OPF_JMP|OPF_CC }, // 72
  { "jnc",  OP_JNC,    1, 1, OPF_JMP|OPF_CC }, // 73 CF=0
  { "jnb",  OP_JNC,    1, 1, OPF_JMP|OPF_CC }, // 73
  { "jae",  OP_JNC,    1, 1, OPF_JMP|OPF_CC }, // 73
  { "jz",   OP_JZ,     1, 1, OPF_JMP|OPF_CC }, // 74 ZF=1
  { "je",   OP_JZ,     1, 1, OPF_JMP|OPF_CC }, // 74
  { "jnz",  OP_JNZ,    1, 1, OPF_JMP|OPF_CC }, // 75 ZF=0
  { "jne",  OP_JNZ,    1, 1, OPF_JMP|OPF_CC }, // 75
  { "jbe",  OP_JBE,    1, 1, OPF_JMP|OPF_CC }, // 76 CF=1 || ZF=1
  { "jna",  OP_JBE,    1, 1, OPF_JMP|OPF_CC }, // 76
  { "ja",   OP_JA,     1, 1, OPF_JMP|OPF_CC }, // 77 CF=0 && ZF=0
  { "jnbe", OP_JA,     1, 1, OPF_JMP|OPF_CC }, // 77
  { "js",   OP_JS,     1, 1, OPF_JMP|OPF_CC }, // 78 SF=1
  { "jns",  OP_JNS,    1, 1, OPF_JMP|OPF_CC }, // 79 SF=0
  { "jp",   OP_JP,     1, 1, OPF_JMP|OPF_CC }, // 7a PF=1
  { "jpe",  OP_JP,     1, 1, OPF_JMP|OPF_CC }, // 7a
  { "jnp",  OP_JNP,    1, 1, OPF_JMP|OPF_CC }, // 7b PF=0
  { "jpo",  OP_JNP,    1, 1, OPF_JMP|OPF_CC }, // 7b
  { "jl",   OP_JL,     1, 1, OPF_JMP|OPF_CC }, // 7c SF!=OF
  { "jnge", OP_JL,     1, 1, OPF_JMP|OPF_CC }, // 7c
  { "jge",  OP_JGE,    1, 1, OPF_JMP|OPF_CC }, // 7d SF=OF
  { "jnl",  OP_JGE,    1, 1, OPF_JMP|OPF_CC }, // 7d
  { "jle",  OP_JLE,    1, 1, OPF_JMP|OPF_CC }, // 7e ZF=1 || SF!=OF
  { "jng",  OP_JLE,    1, 1, OPF_JMP|OPF_CC }, // 7e
  { "jg",   OP_JG,     1, 1, OPF_JMP|OPF_CC }, // 7f ZF=0 && SF=OF
  { "jnle", OP_JG,     1, 1, OPF_JMP|OPF_CC }, // 7f
  { "seto",   OP_JO,   1, 1, OPF_DATA|OPF_CC },
  { "setno",  OP_JNO,  1, 1, OPF_DATA|OPF_CC },
  { "setc",   OP_JC,   1, 1, OPF_DATA|OPF_CC },
  { "setb",   OP_JC,   1, 1, OPF_DATA|OPF_CC },
  { "setnc",  OP_JNC,  1, 1, OPF_DATA|OPF_CC },
  { "setae",  OP_JNC,  1, 1, OPF_DATA|OPF_CC },
  { "setz",   OP_JZ,   1, 1, OPF_DATA|OPF_CC },
  { "sete",   OP_JZ,   1, 1, OPF_DATA|OPF_CC },
  { "setnz",  OP_JNZ,  1, 1, OPF_DATA|OPF_CC },
  { "setne",  OP_JNZ,  1, 1, OPF_DATA|OPF_CC },
  { "setbe",  OP_JBE,  1, 1, OPF_DATA|OPF_CC },
  { "setna",  OP_JBE,  1, 1, OPF_DATA|OPF_CC },
  { "seta",   OP_JA,   1, 1, OPF_DATA|OPF_CC },
  { "setnbe", OP_JA,   1, 1, OPF_DATA|OPF_CC },
  { "sets",   OP_JS,   1, 1, OPF_DATA|OPF_CC },
  { "setns",  OP_JNS,  1, 1, OPF_DATA|OPF_CC },
  { "setp",   OP_JP,   1, 1, OPF_DATA|OPF_CC },
  { "setpe",  OP_JP,   1, 1, OPF_DATA|OPF_CC },
  { "setnp",  OP_JNP,  1, 1, OPF_DATA|OPF_CC },
  { "setpo",  OP_JNP,  1, 1, OPF_DATA|OPF_CC },
  { "setl",   OP_JL,   1, 1, OPF_DATA|OPF_CC },
  { "setnge", OP_JL,   1, 1, OPF_DATA|OPF_CC },
  { "setge",  OP_JGE,  1, 1, OPF_DATA|OPF_CC },
  { "setnl",  OP_JGE,  1, 1, OPF_DATA|OPF_CC },
  { "setle",  OP_JLE,  1, 1, OPF_DATA|OPF_CC },
  { "setng",  OP_JLE,  1, 1, OPF_DATA|OPF_CC },
  { "setg",   OP_JG,   1, 1, OPF_DATA|OPF_CC },
  { "setnle", OP_JG,   1, 1, OPF_DATA|OPF_CC },
};

static void parse_op(struct parsed_op *op, char words[16][256], int wordc)
{
  enum opr_lenmod lmod = OPLM_UNSPEC;
  int prefix_flags = 0;
  int regmask_ind;
  int regmask;
  int op_w = 0;
  int opr = 0;
  int w = 0;
  int i;

  for (i = 0; i < ARRAY_SIZE(pref_table); i++) {
    if (IS(words[w], pref_table[i].name)) {
      prefix_flags = pref_table[i].flags;
      break;
    }
  }

  if (prefix_flags) {
    if (wordc <= 1)
      aerr("lone prefix: '%s'\n", words[0]);
    w++;
  }

  op_w = w;
  for (i = 0; i < ARRAY_SIZE(op_table); i++) {
    if (IS(words[w], op_table[i].name))
      break;
  }

  if (i == ARRAY_SIZE(op_table))
    aerr("unhandled op: '%s'\n", words[0]);
  w++;

  op->op = op_table[i].op;
  op->flags = op_table[i].flags | prefix_flags;
  op->regmask_src = op->regmask_dst = 0;

  for (opr = 0; opr < op_table[i].minopr; opr++) {
    regmask = regmask_ind = 0;
    w = parse_operand(&op->operand[opr], &regmask, &regmask_ind,
      words, wordc, w, op->flags);

    if (opr == 0 && (op->flags & OPF_DATA))
      op->regmask_dst = regmask;
    // for now, mark dst as src too
    op->regmask_src |= regmask | regmask_ind;
  }

  for (; w < wordc && opr < op_table[i].maxopr; opr++) {
    w = parse_operand(&op->operand[opr],
      &op->regmask_src, &op->regmask_src,
      words, wordc, w, op->flags);
  }

  if (w < wordc)
    aerr("parse_op %s incomplete: %d/%d\n",
      words[0], w, wordc);

  // special cases
  op->operand_cnt = opr;
  if (!strncmp(op_table[i].name, "set", 3))
    op->operand[0].lmod = OPLM_BYTE;

  // ops with implicit argumets
  switch (op->op) {
  case OP_CDQ:
    op->operand_cnt = 2;
    setup_reg_opr(&op->operand[0], xDX, OPLM_DWORD, &op->regmask_dst);
    setup_reg_opr(&op->operand[1], xAX, OPLM_DWORD, &op->regmask_src);
    break;

  case OP_STOS:
    if (op->operand_cnt != 0)
      break;
    if      (IS(words[op_w], "stosb"))
      lmod = OPLM_BYTE;
    else if (IS(words[op_w], "stosw"))
      lmod = OPLM_WORD;
    else if (IS(words[op_w], "stosd"))
      lmod = OPLM_DWORD;
    op->operand_cnt = 3;
    setup_reg_opr(&op->operand[0], xDI, lmod, &op->regmask_src);
    setup_reg_opr(&op->operand[1], xCX, OPLM_DWORD, &op->regmask_src);
    op->regmask_dst = op->regmask_src;
    setup_reg_opr(&op->operand[2], xAX, OPLM_DWORD, &op->regmask_src);
    break;

  case OP_MOVS:
    if (op->operand_cnt != 0)
      break;
    if      (IS(words[op_w], "movsb"))
      lmod = OPLM_BYTE;
    else if (IS(words[op_w], "movsw"))
      lmod = OPLM_WORD;
    else if (IS(words[op_w], "movsd"))
      lmod = OPLM_DWORD;
    op->operand_cnt = 3;
    setup_reg_opr(&op->operand[0], xDI, lmod, &op->regmask_src);
    setup_reg_opr(&op->operand[1], xSI, OPLM_DWORD, &op->regmask_src);
    setup_reg_opr(&op->operand[2], xCX, OPLM_DWORD, &op->regmask_src);
    op->regmask_dst = op->regmask_src;
    break;

  case OP_IMUL:
    if (op->operand_cnt != 1)
      break;
    // fallthrough
  case OP_MUL:
    // singleop mul
    op->regmask_dst = (1 << xDX) | (1 << xAX);
    op->regmask_src |= (1 << xAX);
    if (op->operand[0].lmod == OPLM_UNSPEC)
      op->operand[0].lmod = OPLM_DWORD;
    break;

  case OP_DIV:
  case OP_IDIV:
    // we could set up operands for edx:eax, but there is no real need to
    // (see is_opr_modified())
    regmask = (1 << xDX) | (1 << xAX);
    op->regmask_dst = regmask;
    op->regmask_src |= regmask;
    if (op->operand[0].lmod == OPLM_UNSPEC)
      op->operand[0].lmod = OPLM_DWORD;
    break;

  case OP_SHL:
  case OP_SHR:
  case OP_SAR:
  case OP_ROL:
  case OP_ROR:
    if (op->operand[1].lmod == OPLM_UNSPEC)
      op->operand[1].lmod = OPLM_BYTE;
    break;

  default:
    break;
  }
}

static const char *op_name(enum op_op op)
{
  int i;

  for (i = 0; i < ARRAY_SIZE(op_table); i++)
    if (op_table[i].op == op)
      return op_table[i].name;

  return "???";
}

// debug
static const char *dump_op(struct parsed_op *po)
{
  static char out[128];
  char *p = out;
  int i;

  snprintf(out, sizeof(out), "%s", op_name(po->op));
  for (i = 0; i < po->operand_cnt; i++) {
    p += strlen(p);
    if (i > 0)
      *p++ = ',';
    snprintf(p, sizeof(out) - (p - out),
      po->operand[i].type == OPT_REGMEM ? " [%s]" : " %s",
      po->operand[i].name);
  }

  return out;
}

static const char *lmod_cast_u(struct parsed_op *po,
  enum opr_lenmod lmod)
{
  switch (lmod) {
  case OPLM_DWORD:
    return "";
  case OPLM_WORD:
    return "(u16)";
  case OPLM_BYTE:
    return "(u8)";
  default:
    ferr(po, "invalid lmod: %d\n", lmod);
    return "(_invalid_)";
  }
}

static const char *lmod_cast_u_ptr(struct parsed_op *po,
  enum opr_lenmod lmod)
{
  switch (lmod) {
  case OPLM_DWORD:
    return "*(u32 *)";
  case OPLM_WORD:
    return "*(u16 *)";
  case OPLM_BYTE:
    return "*(u8 *)";
  default:
    ferr(po, "invalid lmod: %d\n", lmod);
    return "(_invalid_)";
  }
}

static const char *lmod_cast_s(struct parsed_op *po,
  enum opr_lenmod lmod)
{
  switch (lmod) {
  case OPLM_DWORD:
    return "(s32)";
  case OPLM_WORD:
    return "(s16)";
  case OPLM_BYTE:
    return "(s8)";
  default:
    ferr(po, "%s: invalid lmod: %d\n", __func__, lmod);
    return "(_invalid_)";
  }
}

static const char *lmod_cast(struct parsed_op *po,
  enum opr_lenmod lmod, int is_signed)
{
  return is_signed ?
    lmod_cast_s(po, lmod) :
    lmod_cast_u(po, lmod);
}

static int lmod_bytes(struct parsed_op *po, enum opr_lenmod lmod)
{
  switch (lmod) {
  case OPLM_DWORD:
    return 4;
  case OPLM_WORD:
    return 2;
  case OPLM_BYTE:
    return 1;
  default:
    ferr(po, "%s: invalid lmod: %d\n", __func__, lmod);
    return 0;
  }
}

static const char *opr_name(struct parsed_op *po, int opr_num)
{
  if (opr_num >= po->operand_cnt)
    ferr(po, "opr OOR: %d/%d\n", opr_num, po->operand_cnt);
  return po->operand[opr_num].name;
}

static unsigned int opr_const(struct parsed_op *po, int opr_num)
{
  if (opr_num >= po->operand_cnt)
    ferr(po, "opr OOR: %d/%d\n", opr_num, po->operand_cnt);
  if (po->operand[opr_num].type != OPT_CONST)
    ferr(po, "opr %d: const expected\n", opr_num);
  return po->operand[opr_num].val;
}

static const char *opr_reg_p(struct parsed_op *po, struct parsed_opr *popr)
{
  if ((unsigned int)popr->reg >= MAX_REGS)
    ferr(po, "invalid reg: %d\n", popr->reg);
  return regs_r32[popr->reg];
}

static struct parsed_equ *equ_find(struct parsed_op *po, const char *name)
{
  int i;

  for (i = 0; i < g_eqcnt; i++)
    if (IS(g_eqs[i].name, name))
      break;
  if (i >= g_eqcnt) {
    if (po != NULL)
      ferr(po, "unresolved equ name: '%s'\n", name);
    return NULL;
  }

  return &g_eqs[i];
}

static void bg_frame_access(struct parsed_op *po, enum opr_lenmod lmod,
  char *buf, size_t buf_size, const char *name,
  int is_src, int is_lea)
{
  const char *prefix = "";
  struct parsed_equ *eq;
  int i, arg_i, arg_s;
  const char *bp_arg;
  int stack_ra = 0;
  int sf_ofs;

  bp_arg = parse_stack_el(name);
  snprintf(g_comment, sizeof(g_comment), "%s", bp_arg);
  eq = equ_find(po, bp_arg);
  if (eq == NULL)
    ferr(po, "detected but missing eq\n");

  if (!strncmp(name, "ebp", 3))
    stack_ra = 4;

  if (stack_ra <= eq->offset && eq->offset < stack_ra + 4)
    ferr(po, "reference to ra? %d %d\n", eq->offset, stack_ra);

  if (eq->offset > stack_ra) {
    arg_i = (eq->offset - stack_ra - 4) / 4;
    if (arg_i < 0 || arg_i >= g_func_pp.argc_stack)
      ferr(po, "offset %d doesn't map to any arg\n", eq->offset);

    for (i = arg_s = 0; i < g_func_pp.argc; i++) {
      if (g_func_pp.arg[i].reg != NULL)
        continue;
      if (arg_s == arg_i)
        break;
      arg_s++;
    }
    if (i == g_func_pp.argc)
      ferr(po, "arg %d not in prototype?\n", arg_i);
    if (is_lea)
      ferr(po, "lea to arg?\n");

    snprintf(buf, buf_size, "%sa%d", is_src ? "(u32)" : "", i + 1);
  }
  else {
    if (g_bp_stack == 0)
      ferr(po, "bp_stack access after it was not detected\n");

    sf_ofs = g_bp_stack + eq->offset;
    if (sf_ofs < 0)
      ferr(po, "bp_stack offset %d/%d\n", eq->offset, g_bp_stack);

    if (is_lea)
      prefix = "(u32)&";

    switch (lmod)
    {
    case OPLM_BYTE:
      snprintf(buf, buf_size, "%ssf.b[%d]", prefix, sf_ofs);
      break;
    case OPLM_WORD:
      snprintf(buf, buf_size, "%ssf.w[%d]", prefix, sf_ofs / 2);
      break;
    case OPLM_DWORD:
      snprintf(buf, buf_size, "%ssf.d[%d]", prefix, sf_ofs / 4);
      break;
    default:
      ferr(po, "bp_stack bad lmod: %d\n", lmod);
    }
  }
}

static char *out_src_opr(char *buf, size_t buf_size,
	struct parsed_op *po, struct parsed_opr *popr, int is_lea)
{
  char tmp1[256], tmp2[256];
  char expr[256];
  int ret;

  switch (popr->type) {
  case OPT_REG:
    if (is_lea)
      ferr(po, "lea from reg?\n");

    switch (popr->lmod) {
    case OPLM_DWORD:
      snprintf(buf, buf_size, "%s", opr_reg_p(po, popr));
      break;
    case OPLM_WORD:
      snprintf(buf, buf_size, "(u16)%s", opr_reg_p(po, popr));
      break;
    case OPLM_BYTE:
      if (popr->name[1] == 'h') // XXX..
        snprintf(buf, buf_size, "(u8)(%s >> 8)", opr_reg_p(po, popr));
      else
        snprintf(buf, buf_size, "(u8)%s", opr_reg_p(po, popr));
      break;
    default:
      ferr(po, "invalid src lmod: %d\n", popr->lmod);
    }
    break;

  case OPT_REGMEM:
    if (parse_stack_el(popr->name)) {
      bg_frame_access(po, popr->lmod, buf, buf_size,
        popr->name, 1, is_lea);
      break;
    }

    strcpy(expr, popr->name);
    if (strchr(expr, '[')) {
      // special case: '[' can only be left for label[reg] form
      ret = sscanf(expr, "%[^[][%[^]]]", tmp1, tmp2);
      if (ret != 2)
        ferr(po, "parse failure for '%s'\n", expr);
      snprintf(expr, sizeof(expr), "(u32)&%s + %s", tmp1, tmp2);
    }

    // XXX: do we need more parsing?
    if (is_lea) {
      snprintf(buf, buf_size, "%s", expr);
      break;
    }

    snprintf(buf, buf_size, "%s(%s)",
      lmod_cast_u_ptr(po, popr->lmod), expr);
    break;

  case OPT_LABEL:
    if (is_lea)
      snprintf(buf, buf_size, "(u32)&%s", popr->name);
    else
      snprintf(buf, buf_size, "(u32)%s", popr->name);
    break;

  case OPT_OFFSET:
    if (is_lea)
      ferr(po, "lea an offset?\n");
    snprintf(buf, buf_size, "(u32)&%s", popr->name);
    break;

  case OPT_CONST:
    if (is_lea)
      ferr(po, "lea from const?\n");

    printf_number(buf, buf_size, popr->val);
    break;

  default:
    ferr(po, "invalid src type: %d\n", popr->type);
  }

  return buf;
}

static char *out_dst_opr(char *buf, size_t buf_size,
	struct parsed_op *po, struct parsed_opr *popr)
{
  switch (popr->type) {
  case OPT_REG:
    switch (popr->lmod) {
    case OPLM_DWORD:
      snprintf(buf, buf_size, "%s", opr_reg_p(po, popr));
      break;
    case OPLM_WORD:
      // ugh..
      snprintf(buf, buf_size, "LOWORD(%s)", opr_reg_p(po, popr));
      break;
    case OPLM_BYTE:
      // ugh..
      if (popr->name[1] == 'h') // XXX..
        snprintf(buf, buf_size, "BYTE1(%s)", opr_reg_p(po, popr));
      else
        snprintf(buf, buf_size, "LOBYTE(%s)", opr_reg_p(po, popr));
      break;
    default:
      ferr(po, "invalid dst lmod: %d\n", popr->lmod);
    }
    break;

  case OPT_REGMEM:
    if (parse_stack_el(popr->name)) {
      bg_frame_access(po, popr->lmod, buf, buf_size,
        popr->name, 0, 0);
      break;
    }

    return out_src_opr(buf, buf_size, po, popr, 0);

  case OPT_LABEL:
    snprintf(buf, buf_size, "%s", popr->name);
    break;

  default:
    ferr(po, "invalid dst type: %d\n", popr->type);
  }

  return buf;
}

static enum parsed_flag_op split_cond(struct parsed_op *po,
  enum op_op op, int *is_inv)
{
  *is_inv = 0;

  switch (op) {
  case OP_JO:
    return PFO_O;
  case OP_JC:
    return PFO_C;
  case OP_JZ:
    return PFO_Z;
  case OP_JBE:
    return PFO_BE;
  case OP_JS:
    return PFO_S;
  case OP_JP:
    return PFO_P;
  case OP_JL:
    return PFO_L;
  case OP_JLE:
    return PFO_LE;

  case OP_JNO:
    *is_inv = 1;
    return PFO_O;
  case OP_JNC:
    *is_inv = 1;
    return PFO_C;
  case OP_JNZ:
    *is_inv = 1;
    return PFO_Z;
  case OP_JA:
    *is_inv = 1;
    return PFO_BE;
  case OP_JNS:
    *is_inv = 1;
    return PFO_S;
  case OP_JNP:
    *is_inv = 1;
    return PFO_P;
  case OP_JGE:
    *is_inv = 1;
    return PFO_L;
  case OP_JG:
    *is_inv = 1;
    return PFO_LE;

  case OP_ADC:
  case OP_SBB:
    return PFO_C;

  default:
    ferr(po, "split_cond: bad op %d\n", op);
    return -1;
  }
}

static void out_test_for_cc(char *buf, size_t buf_size,
  struct parsed_op *po, enum parsed_flag_op pfo, int is_inv,
  enum opr_lenmod lmod, const char *expr)
{
  const char *cast, *scast;

  cast = lmod_cast_u(po, lmod);
  scast = lmod_cast_s(po, lmod);

  switch (pfo) {
  case PFO_Z:
  case PFO_BE: // CF=1||ZF=1; CF=0
    snprintf(buf, buf_size, "(%s%s %s 0)",
      cast, expr, is_inv ? "!=" : "==");
    break;

  case PFO_S:
  case PFO_L: // SF!=OF; OF=0
    snprintf(buf, buf_size, "(%s%s %s 0)",
      scast, expr, is_inv ? ">=" : "<");
    break;

  case PFO_LE: // ZF=1||SF!=OF; OF=0
    snprintf(buf, buf_size, "(%s%s %s 0)",
      scast, expr, is_inv ? ">" : "<=");
    break;

  default:
    ferr(po, "%s: unhandled parsed_flag_op: %d\n", __func__, pfo);
  }
}

static void out_cmp_for_cc(char *buf, size_t buf_size,
  struct parsed_op *po, enum parsed_flag_op pfo, int is_inv,
  enum opr_lenmod lmod, const char *expr1, const char *expr2)
{
  const char *cast, *scast;

  cast = lmod_cast_u(po, lmod);
  scast = lmod_cast_s(po, lmod);

  switch (pfo) {
  case PFO_C:
    // note: must be unsigned compare
    snprintf(buf, buf_size, "(%s%s %s %s%s)",
      cast, expr1, is_inv ? ">=" : "<", cast, expr2);
    break;

  case PFO_Z:
    snprintf(buf, buf_size, "(%s%s %s %s%s)",
      cast, expr1, is_inv ? "!=" : "==", cast, expr2);
    break;

  case PFO_BE: // !a
    // note: must be unsigned compare
    snprintf(buf, buf_size, "(%s%s %s %s%s)",
      cast, expr1, is_inv ? ">" : "<=", cast, expr2);
    break;

  // note: must be signed compare
  case PFO_S:
    snprintf(buf, buf_size, "(%s(%s - %s) %s 0)",
      scast, expr1, expr2, is_inv ? ">=" : "<");
    break;

  case PFO_L: // !ge
    snprintf(buf, buf_size, "(%s%s %s %s%s)",
      scast, expr1, is_inv ? ">=" : "<", scast, expr2);
    break;

  case PFO_LE:
    snprintf(buf, buf_size, "(%s%s %s %s%s)",
      scast, expr1, is_inv ? ">" : "<=", scast, expr2);
    break;

  default:
    ferr(po, "%s: unhandled parsed_flag_op: %d\n", __func__, pfo);
  }
}

static void out_cmp_test(char *buf, size_t buf_size,
  struct parsed_op *po, enum parsed_flag_op pfo, int is_inv)
{
  char buf1[256], buf2[256], buf3[256];

  if (po->op == OP_TEST) {
    if (IS(opr_name(po, 0), opr_name(po, 1))) {
      out_src_opr(buf3, sizeof(buf3), po, &po->operand[0], 0);
    }
    else {
      out_src_opr(buf1, sizeof(buf1), po, &po->operand[0], 0);
      out_src_opr(buf2, sizeof(buf2), po, &po->operand[1], 0);
      snprintf(buf3, sizeof(buf3), "(%s & %s)", buf1, buf2);
    }
    out_test_for_cc(buf, buf_size, po, pfo, is_inv,
      po->operand[0].lmod, buf3);
  }
  else if (po->op == OP_CMP) {
    out_src_opr(buf2, sizeof(buf2), po, &po->operand[0], 0);
    out_src_opr(buf3, sizeof(buf3), po, &po->operand[1], 0);
    out_cmp_for_cc(buf, buf_size, po, pfo, is_inv,
      po->operand[0].lmod, buf2, buf3);
  }
  else
    ferr(po, "%s: unhandled op: %d\n", __func__, po->op);
}

static void propagate_lmod(struct parsed_op *po, struct parsed_opr *popr1,
	struct parsed_opr *popr2)
{
  if (popr1->lmod == OPLM_UNSPEC && popr2->lmod == OPLM_UNSPEC)
    ferr(po, "missing lmod for both operands\n");

  if (popr1->lmod == OPLM_UNSPEC)
    popr1->lmod = popr2->lmod;
  else if (popr2->lmod == OPLM_UNSPEC)
    popr2->lmod = popr1->lmod;
  else if (popr1->lmod != popr2->lmod)
    ferr(po, "conflicting lmods: %d vs %d\n", popr1->lmod, popr2->lmod);
}

static const char *op_to_c(struct parsed_op *po)
{
  switch (po->op)
  {
    case OP_ADD:
    case OP_ADC:
      return "+";
    case OP_SUB:
    case OP_SBB:
      return "-";
    case OP_AND:
      return "&";
    case OP_OR:
      return "|";
    case OP_XOR:
      return "^";
    case OP_SHL:
      return "<<";
    case OP_SHR:
      return ">>";
    case OP_MUL:
    case OP_IMUL:
      return "*";
    default:
      ferr(po, "op_to_c was supplied with %d\n", po->op);
  }
}

static void set_flag_no_dup(struct parsed_op *po, enum op_flags flag,
  enum op_flags flag_check)
{
  if (po->flags & flag)
    ferr(po, "flag %x already set\n", flag);
  if (po->flags & flag_check)
    ferr(po, "flag_check %x already set\n", flag_check);

  po->flags |= flag;
}

static int scan_for_pop(int i, int opcnt, const char *reg,
  int magic, int depth, int *maxdepth, int do_flags)
{
  struct parsed_op *po;
  int ret = 0;

  for (; i < opcnt; i++) {
    po = &ops[i];
    if (po->cc_scratch == magic)
      break; // already checked
    po->cc_scratch = magic;

    if (po->flags & OPF_TAIL)
      return -1; // deadend

    if (po->flags & OPF_RMD)
      continue;

    if ((po->flags & OPF_JMP) && po->op != OP_CALL) {
      if (po->bt_i < 0) {
        ferr(po, "dead branch\n");
        return -1;
      }

      if (po->flags & OPF_CC) {
        ret |= scan_for_pop(po->bt_i, opcnt, reg, magic,
                 depth, maxdepth, do_flags);
        if (ret < 0)
          return ret; // dead end
      }
      else {
        i = po->bt_i - 1;
      }
      continue;
    }

    if ((po->op == OP_POP || po->op == OP_PUSH)
        && po->operand[0].type == OPT_REG
        && IS(po->operand[0].name, reg))
    {
      if (po->op == OP_PUSH) {
        depth++;
        if (depth > *maxdepth)
          *maxdepth = depth;
        if (do_flags)
          set_flag_no_dup(po, OPF_RSAVE, OPF_RMD);
      }
      else if (depth == 0) {
        if (do_flags)
          set_flag_no_dup(po, OPF_RMD, OPF_RSAVE);
        return 1;
      }
      else {
        depth--;
        if (depth < 0) // should not happen
          ferr(po, "fail with depth\n");
        if (do_flags)
          set_flag_no_dup(po, OPF_RSAVE, OPF_RMD);
      }
    }
  }

  return ret;
}

// scan for pop starting from 'ret' op (all paths)
static int scan_for_pop_ret(int i, int opcnt, const char *reg,
  int flag_set)
{
  int found = 0;
  int j;

  for (; i < opcnt; i++) {
    if (!(ops[i].flags & OPF_TAIL))
      continue;

    for (j = i - 1; j >= 0; j--) {
      if (ops[j].flags & OPF_RMD)
        continue;
      if (ops[j].flags & OPF_JMP)
        return -1;

      if (ops[j].op == OP_POP && ops[j].operand[0].type == OPT_REG
          && IS(ops[j].operand[0].name, reg))
      {
        found = 1;
        ops[j].flags |= flag_set;
        break;
      }

      if (g_labels[j][0] != 0)
        return -1;
    }
  }

  return found ? 0 : -1;
}

// is operand 'opr modified' by parsed_op 'po'?
static int is_opr_modified(const struct parsed_opr *opr,
  const struct parsed_op *po)
{
  if ((po->flags & OPF_RMD) || !(po->flags & OPF_DATA))
    return 0;

  if (opr->type == OPT_REG && po->operand[0].type == OPT_REG) {
    if (po->regmask_dst & (1 << opr->reg))
      return 1;
    else
      return 0;
  }

  return IS(po->operand[0].name, opr->name);
}

// is any operand of parsed_op 'po_test' modified by parsed_op 'po'?
static int is_any_opr_modified(const struct parsed_op *po_test,
  const struct parsed_op *po)
{
  int i;

  if ((po->flags & OPF_RMD) || !(po->flags & OPF_DATA))
    return 0;

  if (po_test->regmask_src & po->regmask_dst)
    return 1;

  for (i = 0; i < po_test->operand_cnt; i++)
    if (IS(po_test->operand[i].name, po->operand[0].name))
      return 1;

  return 0;
}

// scan for any po_test operand modification in range given
static int scan_for_mod(struct parsed_op *po_test, int i, int opcnt)
{
  for (; i < opcnt; i++) {
    if (is_any_opr_modified(po_test, &ops[i]))
      return i;
  }

  return -1;
}

// scan for po_test operand[0] modification in range given
static int scan_for_mod_opr0(struct parsed_op *po_test,
  int i, int opcnt)
{
  for (; i < opcnt; i++) {
    if (is_opr_modified(&po_test->operand[0], &ops[i]))
      return i;
  }

  return -1;
}

static int scan_for_flag_set(int i)
{
  for (; i >= 0; i--) {
    if (ops[i].flags & OPF_FLAGS)
      return i;

    if ((ops[i].flags & OPF_JMP) && !(ops[i].flags & OPF_CC))
      return -1;
    if (g_labels[i][0] != 0)
      return -1;
  }

  return -1;
}

// scan back for cdq, if anything modifies edx, fail
static int scan_for_cdq_edx(int i)
{
  for (; i >= 0; i--) {
    if (ops[i].op == OP_CDQ)
      return i;

    if (ops[i].regmask_dst & (1 << xDX))
      return -1;
    if (g_labels[i][0] != 0)
      return -1;
  }

  return -1;
}

static void gen_func(FILE *fout, FILE *fhdr, const char *funcn, int opcnt)
{
  struct parsed_op *po, *delayed_flag_op = NULL, *tmp_op;
  struct parsed_opr *last_arith_dst = NULL;
  char buf1[256], buf2[256], buf3[256];
  struct parsed_proto *pp, *pp_tmp;
  const char *tmpname;
  enum parsed_flag_op pfo;
  int save_arg_vars = 0;
  int cmp_result_vars = 0;
  int need_mul_var = 0;
  int had_decl = 0;
  int regmask_save = 0;
  int regmask_arg = 0;
  int regmask = 0;
  int pfomask = 0;
  int depth = 0;
  int no_output;
  int dummy;
  int arg;
  int i, j;
  int reg;
  int ret;

  g_bp_frame = g_bp_stack = 0;

  ret = proto_parse(fhdr, funcn, &g_func_pp);
  if (ret)
    ferr(ops, "proto_parse failed for '%s'\n", funcn);

  fprintf(fout, "%s %s(", g_func_pp.ret_type, funcn);
  for (i = 0; i < g_func_pp.argc; i++) {
    if (i > 0)
      fprintf(fout, ", ");
    fprintf(fout, "%s a%d", g_func_pp.arg[i].type, i + 1);
  }
  fprintf(fout, ")\n{\n");

  // pass1:
  // - handle ebp frame, remove ops related to it
  if (ops[0].op == OP_PUSH && IS(opr_name(&ops[0], 0), "ebp")
      && ops[1].op == OP_MOV
      && IS(opr_name(&ops[1], 0), "ebp")
      && IS(opr_name(&ops[1], 1), "esp"))
  {
    int ecx_push = 0;

    g_bp_frame = 1;
    ops[0].flags |= OPF_RMD;
    ops[1].flags |= OPF_RMD;

    if (ops[2].op == OP_SUB && IS(opr_name(&ops[2], 0), "esp")) {
      g_bp_stack = opr_const(&ops[2], 1);
      ops[2].flags |= OPF_RMD;
    }
    else {
      // another way msvc builds stack frame..
      i = 2;
      while (ops[i].op == OP_PUSH && IS(opr_name(&ops[i], 0), "ecx")) {
        g_bp_stack += 4;
        ops[i].flags |= OPF_RMD;
        ecx_push++;
        i++;
      }
    }

    i = 2;
    do {
      for (; i < opcnt; i++)
        if (ops[i].op == OP_RET)
          break;
      if (ops[i - 1].op != OP_POP || !IS(opr_name(&ops[i - 1], 0), "ebp"))
        ferr(&ops[i - 1], "'pop ebp' expected\n");
      ops[i - 1].flags |= OPF_RMD;

      if (g_bp_stack != 0) {
        if (ops[i - 2].op != OP_MOV
            || !IS(opr_name(&ops[i - 2], 0), "esp")
            || !IS(opr_name(&ops[i - 2], 1), "ebp"))
        {
          ferr(&ops[i - 2], "esp restore expected\n");
        }
        ops[i - 2].flags |= OPF_RMD;

        if (ecx_push && ops[i - 3].op == OP_POP
          && IS(opr_name(&ops[i - 3], 0), "ecx"))
        {
          ferr(&ops[i - 3], "unexpected ecx pop\n");
        }
      }

      i++;
    } while (i < opcnt);
  }

  // pass2:
  // - resolve all branches
  for (i = 0; i < opcnt; i++) {
    po = &ops[i];
    po->bt_i = -1;

    if ((po->flags & OPF_RMD) || !(po->flags & OPF_JMP)
        || po->op == OP_CALL || po->op == OP_RET)
      continue;

    for (j = 0; j < opcnt; j++) {
      if (g_labels[j][0] && IS(po->operand[0].name, g_labels[j])) {
        po->bt_i = j;
        po->lrl = g_label_refs[j];
        g_label_refs[j] = po;
        break;
      }
    }

    if (po->bt_i == -1) {
      // assume tail call
      po->op = OP_CALL;
      po->flags |= OPF_TAIL;
    }
  }

  // pass3:
  // - process calls
  for (i = 0; i < opcnt; i++) {
    po = &ops[i];
    if (po->flags & OPF_RMD)
      continue;

    if (po->op == OP_CALL)
    {
      pp = malloc(sizeof(*pp));
      my_assert_not(pp, NULL);
      tmpname = opr_name(&ops[i], 0);
      ret = proto_parse(fhdr, tmpname, pp);
      if (ret)
        ferr(po, "proto_parse failed for '%s'\n", tmpname);

      for (arg = 0; arg < pp->argc; arg++)
        if (pp->arg[arg].reg == NULL)
          break;

      for (j = i - 1; j >= 0 && arg < pp->argc; j--) {
        if (ops[j].op == OP_CALL) {
          pp_tmp = ops[j].datap;
          if (pp_tmp == NULL)
            ferr(po, "arg collect hit unparsed call\n");
          if (pp_tmp->argc_stack > 0)
            ferr(po, "arg collect hit '%s' with %d stack args\n",
              opr_name(&ops[j], 0), pp_tmp->argc_stack);
        }
        else if ((ops[j].flags & OPF_TAIL)
            || (ops[j].flags & (OPF_JMP|OPF_CC)) == OPF_JMP)
        {
          break;
        }

        if (ops[j].op == OP_PUSH) {
          pp->arg[arg].datap = &ops[j];
          ret = scan_for_mod(&ops[j], j + 1, i);
          if (ret >= 0) {
            // mark this push as one that needs operand saving
            ops[j].argmask |= 1 << arg;
            save_arg_vars |= 1 << arg;
          }
          else
            ops[j].flags |= OPF_RMD;

          // next arg
          for (arg++; arg < pp->argc; arg++)
            if (pp->arg[arg].reg == NULL)
              break;
        }

        if (g_labels[j][0] != 0) {
          if (j > 0 && ((ops[j - 1].flags & OPF_TAIL)
            || (ops[j - 1].flags & (OPF_JMP|OPF_CC)) == OPF_JMP))
          {
            // follow the branch in reverse
            if (g_label_refs[j] == NULL)
              ferr(po, "no refs for '%s'?\n", g_labels[j]);
            if (g_label_refs[j]->lrl != NULL)
              ferr(po, "unhandled multiple fefs to '%s'\n", g_labels[j]);
            j = (g_label_refs[j] - ops) + 1;
            continue;
          }
          break;
        }
      }
      if (arg < pp->argc)
        ferr(po, "arg collect failed for '%s'\n", tmpname);
      po->datap = pp;
    }
  }

  // pass4:
  // - find POPs for PUSHes, rm both
  // - scan for all used registers
  // - find flag set ops for their users
  for (i = 0; i < opcnt; i++) {
    po = &ops[i];
    if (po->flags & OPF_RMD)
      continue;

    if (po->op == OP_PUSH
        && po->argmask == 0 && !(po->flags & OPF_RSAVE)
        && po->operand[0].type == OPT_REG)
    {
      reg = po->operand[0].reg;
      if (reg < 0)
        ferr(po, "reg not set for push?\n");

      depth = 0;
      ret = scan_for_pop(i + 1, opcnt,
              po->operand[0].name, i + opcnt, 0, &depth, 0);
      if (ret == 1) {
        if (depth > 1)
          ferr(po, "too much depth: %d\n", depth);
        if (depth > 0)
          regmask_save |= 1 << reg;

        po->flags |= OPF_RMD;
        scan_for_pop(i + 1, opcnt, po->operand[0].name,
          i + opcnt * 2, 0, &depth, 1);
        continue;
      }
      ret = scan_for_pop_ret(i + 1, opcnt, po->operand[0].name, 0);
      if (ret == 0) {
        arg = OPF_RMD;
        if (regmask & (1 << reg)) {
          if (regmask_save & (1 << reg))
            ferr(po, "%s already saved?\n", po->operand[0].name);
          arg = OPF_RSAVE;
        }
        po->flags |= arg;
        scan_for_pop_ret(i + 1, opcnt, po->operand[0].name, arg);
        continue;
      }
    }

    regmask |= po->regmask_src | po->regmask_dst;

    if (po->flags & OPF_CC)
    {
      ret = scan_for_flag_set(i - 1);
      if (ret < 0)
        ferr(po, "unable to trace flag setter\n");

      tmp_op = &ops[ret]; // flag setter
      pfo = split_cond(po, po->op, &dummy);
      pfomask = 0;

      // to get nicer code, we try to delay test and cmp;
      // if we can't because of operand modification, or if we
      // have math op, make it calculate flags explicitly
      if (tmp_op->op == OP_TEST || tmp_op->op == OP_CMP) {
        if (scan_for_mod(tmp_op, ret + 1, i) >= 0)
          pfomask = 1 << pfo;
      }
      else {
        if ((pfo != PFO_Z && pfo != PFO_S && pfo != PFO_P)
            || scan_for_mod_opr0(tmp_op, ret + 1, i) >= 0)
          pfomask = 1 << pfo;
      }
      if (pfomask) {
        tmp_op->pfomask |= pfomask;
        cmp_result_vars |= pfomask;
        po->datap = tmp_op;
      }

      if (po->op == OP_ADC || po->op == OP_SBB)
        cmp_result_vars |= 1 << PFO_C;
    }
    else if (po->op == OP_MUL
      || (po->op == OP_IMUL && po->operand_cnt == 1))
    {
      need_mul_var = 1;
    }
  }

  // declare stack frame
  if (g_bp_stack)
    fprintf(fout, "  union { u32 d[%d]; u16 w[%d]; u8 b[%d]; } sf;\n",
      (g_bp_stack + 3) / 4, (g_bp_stack + 1) / 2, g_bp_stack);

  // declare arg-registers
  for (i = 0; i < g_func_pp.argc; i++) {
    if (g_func_pp.arg[i].reg != NULL) {
      reg = char_array_i(regs_r32,
              ARRAY_SIZE(regs_r32), g_func_pp.arg[i].reg);
      if (reg < 0)
        ferr(ops, "arg '%s' is not a reg?\n", g_func_pp.arg[i].reg);

      regmask_arg |= 1 << reg;
      fprintf(fout, "  u32 %s = (u32)a%d;\n",
        g_func_pp.arg[i].reg, i + 1);
      had_decl = 1;
    }
  }

  // declare other regs - special case for eax
  if (!((regmask | regmask_arg) & 1) && !IS(g_func_pp.ret_type, "void")) {
    fprintf(fout, "  u32 eax = 0;\n");
    had_decl = 1;
  }

  regmask &= ~regmask_arg;
  regmask &= ~(1 << xSP);
  if (g_bp_frame)
    regmask &= ~(1 << xBP);
  if (regmask) {
    for (reg = 0; reg < 8; reg++) {
      if (regmask & (1 << reg)) {
        fprintf(fout, "  u32 %s;\n", regs_r32[reg]);
        had_decl = 1;
      }
    }
  }

  if (regmask_save) {
    for (reg = 0; reg < 8; reg++) {
      if (regmask_save & (1 << reg)) {
        fprintf(fout, "  u32 s_%s;\n", regs_r32[reg]);
        had_decl = 1;
      }
    }
  }

  if (save_arg_vars) {
    for (reg = 0; reg < 32; reg++) {
      if (save_arg_vars & (1 << reg)) {
        fprintf(fout, "  u32 s_a%d;\n", reg + 1);
        had_decl = 1;
      }
    }
  }

  if (cmp_result_vars) {
    for (i = 0; i < 8; i++) {
      if (cmp_result_vars & (1 << i)) {
        fprintf(fout, "  u32 cond_%s;\n", parsed_flag_op_names[i]);
        had_decl = 1;
      }
    }
  }

  if (need_mul_var) {
    fprintf(fout, "  u64 mul_tmp;\n");
    had_decl = 1;
  }

  if (had_decl)
    fprintf(fout, "\n");

  // output ops
  for (i = 0; i < opcnt; i++)
  {
    if (g_labels[i][0] != 0 && g_label_refs[i] != NULL)
      fprintf(fout, "\n%s:\n", g_labels[i]);

    po = &ops[i];
    if (po->flags & OPF_RMD)
      continue;

    no_output = 0;

    #define assert_operand_cnt(n_) \
      if (po->operand_cnt != n_) \
        ferr(po, "operand_cnt is %d/%d\n", po->operand_cnt, n_)

    // conditional/flag using op?
    if (po->flags & OPF_CC)
    {
      int is_delayed = 0;
      int is_inv = 0;

      pfo = split_cond(po, po->op, &is_inv);

      // we go through all this trouble to avoid using parsed_flag_op,
      // which makes generated code much nicer
      if (delayed_flag_op != NULL)
      {
        out_cmp_test(buf1, sizeof(buf1), delayed_flag_op, pfo, is_inv);
        is_delayed = 1;
      }
      else if (last_arith_dst != NULL
        && (pfo == PFO_Z || pfo == PFO_S || pfo == PFO_P))
      {
        out_src_opr(buf3, sizeof(buf3), po, last_arith_dst, 0);
        out_test_for_cc(buf1, sizeof(buf1), po, pfo, is_inv,
          last_arith_dst->lmod, buf3);
        is_delayed = 1;
      }
      else if (po->datap != NULL) {
        // use preprocessed results
        tmp_op = po->datap;
        if (!tmp_op || !(tmp_op->pfomask & (1 << pfo)))
          ferr(po, "not prepared for pfo %d\n", pfo);

        // note: is_inv was not yet applied
        snprintf(buf1, sizeof(buf1), "(%scond_%s)",
          is_inv ? "!" : "", parsed_flag_op_names[pfo]);
      }
      else {
        ferr(po, "all methods of finding comparison failed\n");
      }
 
      if (po->flags & OPF_JMP) {
        fprintf(fout, "  if %s\n", buf1);
      }
      else if (po->op == OP_ADC || po->op == OP_SBB) {
        if (is_delayed)
          fprintf(fout, "  cond_%s = %s;\n",
            parsed_flag_op_names[pfo], buf1);
      }
      else if (po->flags & OPF_DATA) { // SETcc
        out_dst_opr(buf2, sizeof(buf2), po, &po->operand[0]);
        fprintf(fout, "  %s = %s;", buf2, buf1);
      }
      else {
        ferr(po, "unhandled conditional op\n");
      }
    }

    pfomask = po->pfomask;

    switch (po->op)
    {
      case OP_MOV:
        assert_operand_cnt(2);
        propagate_lmod(po, &po->operand[0], &po->operand[1]);
        fprintf(fout, "  %s = %s;",
            out_dst_opr(buf1, sizeof(buf1), po, &po->operand[0]),
            out_src_opr(buf2, sizeof(buf2), po, &po->operand[1], 0));
        break;

      case OP_LEA:
        assert_operand_cnt(2);
        po->operand[1].lmod = OPLM_DWORD; // always
        fprintf(fout, "  %s = %s;",
            out_dst_opr(buf1, sizeof(buf1), po, &po->operand[0]),
            out_src_opr(buf2, sizeof(buf2), po, &po->operand[1], 1));
        break;

      case OP_MOVZX:
        assert_operand_cnt(2);
        fprintf(fout, "  %s = %s;",
            out_dst_opr(buf1, sizeof(buf1), po, &po->operand[0]),
            out_src_opr(buf2, sizeof(buf2), po, &po->operand[1], 0));
        break;

      case OP_MOVSX:
        assert_operand_cnt(2);
        switch (po->operand[1].lmod) {
        case OPLM_BYTE:
          strcpy(buf3, "(s8)");
          break;
        case OPLM_WORD:
          strcpy(buf3, "(s16)");
          break;
        default:
          ferr(po, "invalid src lmod: %d\n", po->operand[1].lmod);
        }
        fprintf(fout, "  %s = %s%s;",
            out_dst_opr(buf1, sizeof(buf1), po, &po->operand[0]),
            buf3,
            out_src_opr(buf2, sizeof(buf2), po, &po->operand[1], 0));
        break;

      case OP_NOT:
        assert_operand_cnt(1);
        out_dst_opr(buf1, sizeof(buf1), po, &po->operand[0]);
        fprintf(fout, "  %s = ~%s;", buf1, buf1);
        break;

      case OP_CDQ:
        assert_operand_cnt(2);
        fprintf(fout, "  %s = (s32)%s >> 31;",
            out_dst_opr(buf1, sizeof(buf1), po, &po->operand[0]),
            out_src_opr(buf2, sizeof(buf2), po, &po->operand[1], 0));
        strcpy(g_comment, "cdq");
        break;

      case OP_STOS:
        // assumes DF=0
        assert_operand_cnt(3);
        if (po->flags & OPF_REP) {
          fprintf(fout, "  for (; ecx != 0; ecx--, edi += %d)\n",
            lmod_bytes(po, po->operand[0].lmod));
          fprintf(fout, "    %sedi = eax;",
            lmod_cast_u_ptr(po, po->operand[0].lmod));
          strcpy(g_comment, "rep stos");
        }
        else {
          fprintf(fout, "    %sedi = eax; edi += %d;",
            lmod_cast_u_ptr(po, po->operand[0].lmod),
            lmod_bytes(po, po->operand[0].lmod));
          strcpy(g_comment, "stos");
        }
        break;

      case OP_MOVS:
        // assumes DF=0
        assert_operand_cnt(3);
        j = lmod_bytes(po, po->operand[0].lmod);
        strcpy(buf1, lmod_cast_u_ptr(po, po->operand[0].lmod));
        if (po->flags & OPF_REP) {
          fprintf(fout,
            "  for (; ecx != 0; ecx--, edi += %d, esi += %d)\n",
            j, j);
          fprintf(fout,
            "    %sedi = %sesi;", buf1, buf1);
          strcpy(g_comment, "rep movs");
        }
        else {
          fprintf(fout, "    %sedi = %sesi; edi += %d; esi += %d;",
            buf1, buf1, j, j);
          strcpy(g_comment, "movs");
        }
        break;

      // arithmetic w/flags
      case OP_ADD:
      case OP_SUB:
      case OP_AND:
      case OP_OR:
        propagate_lmod(po, &po->operand[0], &po->operand[1]);
        // fallthrough
      case OP_SHL:
      case OP_SHR:
      dualop_arith:
        assert_operand_cnt(2);
        fprintf(fout, "  %s %s= %s;",
            out_dst_opr(buf1, sizeof(buf1), po, &po->operand[0]),
            op_to_c(po),
            out_src_opr(buf2, sizeof(buf2), po, &po->operand[1], 0));
        last_arith_dst = &po->operand[0];
        delayed_flag_op = NULL;
        break;

      case OP_SAR:
        assert_operand_cnt(2);
        out_dst_opr(buf1, sizeof(buf1), po, &po->operand[0]);
        fprintf(fout, "  %s = %s%s >> %s;", buf1,
          lmod_cast_s(po, po->operand[0].lmod), buf1,
          out_src_opr(buf2, sizeof(buf2), po, &po->operand[1], 0));
        last_arith_dst = &po->operand[0];
        delayed_flag_op = NULL;
        break;

      case OP_ROL:
      case OP_ROR:
        assert_operand_cnt(2);
        out_dst_opr(buf1, sizeof(buf1), po, &po->operand[0]);
        if (po->operand[1].type == OPT_CONST) {
          j = po->operand[1].val;
          j %= lmod_bytes(po, po->operand[0].lmod) * 8;
          fprintf(fout, po->op == OP_ROL ?
            "  %s = (%s << %d) | (%s >> %d);" :
            "  %s = (%s >> %d) | (%s << %d);",
            buf1, buf1, j, buf1,
            lmod_bytes(po, po->operand[0].lmod) * 8 - j);
        }
        else
          ferr(po, "TODO\n");
        last_arith_dst = &po->operand[0];
        delayed_flag_op = NULL;
        break;

      case OP_XOR:
        assert_operand_cnt(2);
        propagate_lmod(po, &po->operand[0], &po->operand[1]);
        if (IS(opr_name(po, 0), opr_name(po, 1))) {
          // special case for XOR
          fprintf(fout, "  %s = 0;",
            out_dst_opr(buf1, sizeof(buf1), po, &po->operand[0]));
          last_arith_dst = &po->operand[0];
          delayed_flag_op = NULL;
          break;
        }
        goto dualop_arith;

      case OP_ADC:
      case OP_SBB:
        assert_operand_cnt(2);
        propagate_lmod(po, &po->operand[0], &po->operand[1]);
        fprintf(fout, "  %s %s= %s + cond_c;",
            out_dst_opr(buf1, sizeof(buf1), po, &po->operand[0]),
            op_to_c(po),
            out_src_opr(buf2, sizeof(buf2), po, &po->operand[1], 0));
        last_arith_dst = &po->operand[0];
        delayed_flag_op = NULL;
        break;

      case OP_INC:
      case OP_DEC:
        out_dst_opr(buf1, sizeof(buf1), po, &po->operand[0]);
        strcpy(buf2, po->op == OP_INC ? "++" : "--");
        fprintf(fout, "  %s%s;", buf1, buf2);
        last_arith_dst = &po->operand[0];
        delayed_flag_op = NULL;
        break;

      case OP_NEG:
        out_dst_opr(buf1, sizeof(buf1), po, &po->operand[0]);
        out_src_opr(buf2, sizeof(buf2), po, &po->operand[0], 0);
        fprintf(fout, "  %s = -%s%s;", buf1,
          lmod_cast_s(po, po->operand[0].lmod), buf2);
        last_arith_dst = &po->operand[0];
        delayed_flag_op = NULL;
        if (pfomask & (1 << PFO_C)) {
          fprintf(fout, "\n  cond_c = (%s != 0);", buf1);
          pfomask &= ~(1 << PFO_C);
        }
        break;

      case OP_IMUL:
        if (po->operand_cnt == 2)
          goto dualop_arith;
        if (po->operand_cnt == 3)
          ferr(po, "TODO imul3\n");
        // fallthrough
      case OP_MUL:
        assert_operand_cnt(1);
        strcpy(buf1, po->op == OP_IMUL ? "(s64)(s32)" : "(u64)");
        fprintf(fout, "  mul_tmp = %seax * %s%s;\n", buf1, buf1,
          out_src_opr(buf2, sizeof(buf2), po, &po->operand[0], 0));
        fprintf(fout, "  edx = mul_tmp >> 32;\n");
        fprintf(fout, "  eax = mul_tmp;");
        last_arith_dst = NULL;
        delayed_flag_op = NULL;
        break;

      case OP_DIV:
      case OP_IDIV:
        assert_operand_cnt(1);
        if (po->operand[0].lmod != OPLM_DWORD)
          ferr(po, "unhandled lmod %d\n", po->operand[0].lmod);

        // 32bit division is common, look for it
        if (scan_for_cdq_edx(i - 1) >= 0) {
          out_src_opr(buf1, sizeof(buf1), po, &po->operand[0], 0);
          strcpy(buf2, lmod_cast(po, po->operand[0].lmod,
            po->op == OP_IDIV));
          fprintf(fout, "  edx = %seax %% %s%s;\n", buf2, buf2, buf1);
          fprintf(fout, "  eax = %seax / %s%s;", buf2, buf2, buf1);
        }
        else
          ferr(po, "TODO 64bit divident\n");
        last_arith_dst = NULL;
        delayed_flag_op = NULL;
        break;

      case OP_TEST:
      case OP_CMP:
        propagate_lmod(po, &po->operand[0], &po->operand[1]);
        if (pfomask != 0) {
          for (j = 0; j < 8; j++) {
            if (pfomask & (1 << j)) {
              out_cmp_test(buf1, sizeof(buf1), po, j, 0);
              fprintf(fout, "  cond_%s = %s;",
                parsed_flag_op_names[j], buf1);
            }
          }
          pfomask = 0;
        }
        else
          no_output = 1;
        delayed_flag_op = po;
        break;

      // note: we reuse OP_Jcc for SETcc, only flags differ
      case OP_JO ... OP_JG:
        if (po->flags & OPF_JMP)
          fprintf(fout, "    goto %s;", po->operand[0].name);
        // else SETcc - should already be handled
        break;

      case OP_JMP:
        assert_operand_cnt(1);
        if (po->operand[0].type != OPT_LABEL)
          ferr(po, "unhandled call type\n");

        fprintf(fout, "  goto %s;", po->operand[0].name);
        break;

      case OP_CALL:
        assert_operand_cnt(1);
        if (po->operand[0].type != OPT_LABEL)
          ferr(po, "unhandled call type\n");

        pp = po->datap;
        if (pp == NULL)
          ferr(po, "NULL pp\n");

        fprintf(fout, "  ");
        if (!IS(pp->ret_type, "void")) {
          if (po->flags & OPF_TAIL)
            fprintf(fout, "return ");
          else
            fprintf(fout, "eax = ");
          if (strchr(pp->ret_type, '*'))
            fprintf(fout, "(u32)");
        }

        fprintf(fout, "%s(", opr_name(po, 0));
        for (arg = 0; arg < pp->argc; arg++) {
          if (arg > 0)
            fprintf(fout, ", ");

          if (strchr(pp->arg[arg].type, '*'))
            fprintf(fout, "(%s)", pp->arg[arg].type);

          if (pp->arg[arg].reg != NULL) {
            fprintf(fout, "%s", pp->arg[arg].reg);
            continue;
          }

          // stack arg
          tmp_op = pp->arg[arg].datap;
          if (tmp_op == NULL)
            ferr(po, "parsed_op missing for arg%d\n", arg);
          if (tmp_op->argmask) {
            fprintf(fout, "s_a%d", arg + 1);
          }
          else {
            fprintf(fout, "%s",
              out_src_opr(buf1, sizeof(buf1),
                tmp_op, &tmp_op->operand[0], 0));
          }
        }
        fprintf(fout, ");");

        if (po->flags & OPF_TAIL) {
          strcpy(g_comment, "tailcall");
          if (IS(pp->ret_type, "void"))
            fprintf(fout, "\n  return;");
        }
        delayed_flag_op = NULL;
        last_arith_dst = NULL;
        break;

      case OP_RET:
        if (IS(g_func_pp.ret_type, "void"))
          fprintf(fout, "  return;");
        else if (strchr(g_func_pp.ret_type, '*'))
          fprintf(fout, "  return (%s)eax;",
            g_func_pp.ret_type);
        else
          fprintf(fout, "  return eax;");
        break;

      case OP_PUSH:
        if (po->argmask) {
          // special case - saved func arg
          out_src_opr(buf1, sizeof(buf1), po, &po->operand[0], 0);
          for (j = 0; j < 32; j++) {
            if (po->argmask & (1 << j))
              fprintf(fout, "  s_a%d = %s;", j + 1, buf1);
          }
          break;
        }
        else if (po->flags & OPF_RSAVE) {
          out_src_opr(buf1, sizeof(buf1), po, &po->operand[0], 0);
          fprintf(fout, "  s_%s = %s;", buf1, buf1);
          break;
        }
        ferr(po, "stray push encountered\n");
        break;

      case OP_POP:
        if (po->flags & OPF_RSAVE) {
          out_src_opr(buf1, sizeof(buf1), po, &po->operand[0], 0);
          fprintf(fout, "  %s = s_%s;", buf1, buf1);
          break;
        }
        ferr(po, "stray pop encountered\n");
        break;

      case OP_NOP:
        break;

      default:
        no_output = 1;
        ferr(po, "unhandled op type %d, flags %x\n",
          po->op, po->flags);
        break;
    }

    if (g_comment[0] != 0) {
      fprintf(fout, "  // %s", g_comment);
      g_comment[0] = 0;
      no_output = 0;
    }
    if (!no_output)
      fprintf(fout, "\n");

    if (pfomask != 0)
        ferr(po, "missed flag calc, pfomask=%x\n", pfomask);

    // see is delayed flag stuff is still valid
    if (delayed_flag_op != NULL && delayed_flag_op != po) {
      if (is_any_opr_modified(delayed_flag_op, po))
        delayed_flag_op = NULL;
    }

    if (last_arith_dst != NULL && last_arith_dst != &po->operand[0]) {
      if (is_opr_modified(last_arith_dst, po))
        last_arith_dst = NULL;
    }
  }

  fprintf(fout, "}\n\n");

  // cleanup
  for (i = 0; i < opcnt; i++) {
    if (ops[i].op == OP_CALL) {
      pp = ops[i].datap;
      if (pp) {
        proto_release(pp);
        free(pp);
      }
    }
  }
  proto_release(&g_func_pp);
}

static void set_label(int i, const char *name)
{
  const char *p;
  int len;

  len = strlen(name);
  p = strchr(name, ':');
  if (p != NULL)
    len = p - name;

  if (len > sizeof(g_labels[0]) - 1)
    aerr("label '%s' too long: %d\n", name, len);
  if (g_labels[i][0] != 0)
    aerr("dupe label '%s'?\n", name);
  memcpy(g_labels[i], name, len);
  g_labels[i][len] = 0;
}

// '=' needs special treatment..
static char *next_word_s(char *w, size_t wsize, char *s)
{
	size_t i;

	s = sskip(s);

	for (i = 0; i < wsize - 1; i++) {
		if (s[i] == 0 || my_isblank(s[i]) || (s[i] == '=' && i > 0))
			break;
		w[i] = s[i];
	}
	w[i] = 0;

	if (s[i] != 0 && !my_isblank(s[i]) && s[i] != '=')
		printf("warning: '%s' truncated\n", w);

	return s + i;
}

static int cmpstringp(const void *p1, const void *p2)
{
  return strcmp(*(char * const *)p1, *(char * const *)p2);
}

int main(int argc, char *argv[])
{
  FILE *fout, *fasm, *fhdr, *frlist;
  char line[256];
  char words[16][256];
  int in_func = 0;
  int skip_func = 0;
  int skip_warned = 0;
  int eq_alloc;
  char **rlist = NULL;
  int rlist_len = 0;
  int rlist_alloc = 0;
  int verbose = 0;
  int arg_out;
  int arg = 1;
  int pi = 0;
  int len;
  char *p;
  int wordc;

  if (argv[1] && IS(argv[1], "-v")) {
    verbose = 1;
    arg++;
  }

  if (argc < arg + 3) {
    printf("usage:\n%s [-v] <.c> <.asm> <hdrf> [rlist]*\n",
      argv[0]);
    return 1;
  }

  arg_out = arg++;

  asmfn = argv[arg++];
  fasm = fopen(asmfn, "r");
  my_assert_not(fasm, NULL);

  hdrfn = argv[arg++];
  fhdr = fopen(hdrfn, "r");
  my_assert_not(fhdr, NULL);

  rlist_alloc = 64;
  rlist = malloc(rlist_alloc * sizeof(rlist[0]));
  my_assert_not(rlist, NULL);
  // needs special handling..
  rlist[rlist_len++] = "__alloca_probe";

  for (; arg < argc; arg++) {
    frlist = fopen(argv[arg], "r");
    my_assert_not(frlist, NULL);

    while (fgets(line, sizeof(line), frlist)) {
      p = sskip(line);
      if (*p == 0 || *p == ';' || *p == '#')
        continue;

      p = next_word(words[0], sizeof(words[0]), p);
      if (words[0][0] == 0)
        continue;

      if (rlist_len >= rlist_alloc) {
        rlist_alloc = rlist_alloc * 2 + 64;
        rlist = realloc(rlist, rlist_alloc * sizeof(rlist[0]));
        my_assert_not(rlist, NULL);
      }
      rlist[rlist_len++] = strdup(words[0]);
    }

    fclose(frlist);
    frlist = NULL;
  }

  if (rlist_len > 0)
    qsort(rlist, rlist_len, sizeof(rlist[0]), cmpstringp);

  fout = fopen(argv[arg_out], "w");
  my_assert_not(fout, NULL);

  eq_alloc = 128;
  g_eqs = malloc(eq_alloc * sizeof(g_eqs[0]));
  my_assert_not(g_eqs, NULL);

  while (fgets(line, sizeof(line), fasm))
  {
    asmln++;

    p = sskip(line);
    if (*p == 0 || *p == ';')
      continue;

    memset(words, 0, sizeof(words));
    for (wordc = 0; wordc < 16; wordc++) {
      p = sskip(next_word_s(words[wordc], sizeof(words[0]), p));
      if (*p == 0 || *p == ';') {
        wordc++;
        break;
      }
    }

    if (wordc == 0) {
      // shouldn't happen
      awarn("wordc == 0?\n");
      continue;
    }

    // don't care about this:
    if (words[0][0] == '.'
        || IS(words[0], "include")
        || IS(words[0], "assume") || IS(words[1], "segment")
        || IS(words[0], "align"))
    {
      continue;
    }

    if (IS(words[1], "proc")) {
      if (in_func)
        aerr("proc '%s' while in_func '%s'?\n",
          words[0], g_func);
      p = words[0];
      if (bsearch(&p, rlist, rlist_len, sizeof(rlist[0]), cmpstringp))
        skip_func = 1;
      strcpy(g_func, words[0]);
      set_label(0, words[0]);
      in_func = 1;
      continue;
    }

    if (IS(words[1], "endp")) {
      if (!in_func)
        aerr("endp '%s' while not in_func?\n", words[0]);
      if (!IS(g_func, words[0]))
        aerr("endp '%s' while in_func '%s'?\n",
          words[0], g_func);

      if (in_func && !skip_func)
        gen_func(fout, fhdr, g_func, pi);

      in_func = 0;
      skip_warned = 0;
      skip_func = 0;
      g_func[0] = 0;
      if (pi != 0) {
        memset(&ops, 0, pi * sizeof(ops[0]));
        memset(g_labels, 0, pi * sizeof(g_labels[0]));
        memset(g_label_refs, 0, pi * sizeof(g_label_refs[0]));
        pi = 0;
      }
      g_eqcnt = 0;
      continue;
    }

    p = strchr(words[0], ':');
    if (p != NULL) {
      set_label(pi, words[0]);
      continue;
    }

    if (!in_func || skip_func) {
      if (!skip_warned && !skip_func && g_labels[pi][0] != 0) {
        if (verbose)
          anote("skipping from '%s'\n", g_labels[pi]);
        skip_warned = 1;
      }
      g_labels[pi][0] = 0;
      continue;
    }

    if (IS(words[1], "=")) {
      if (wordc != 5)
        aerr("unhandled equ, wc=%d\n", wordc);
      if (g_eqcnt >= eq_alloc) {
        eq_alloc *= 2;
        g_eqs = realloc(g_eqs, eq_alloc * sizeof(g_eqs[0]));
        my_assert_not(g_eqs, NULL);
      }

      len = strlen(words[0]);
      if (len > sizeof(g_eqs[0].name) - 1)
        aerr("equ name too long: %d\n", len);
      strcpy(g_eqs[g_eqcnt].name, words[0]);

      if (!IS(words[3], "ptr"))
        aerr("unhandled equ\n");
      if (IS(words[2], "dword"))
        g_eqs[g_eqcnt].lmod = OPLM_DWORD;
      else if (IS(words[2], "word"))
        g_eqs[g_eqcnt].lmod = OPLM_WORD;
      else if (IS(words[2], "byte"))
        g_eqs[g_eqcnt].lmod = OPLM_BYTE;
      else
        aerr("bad lmod: '%s'\n", words[2]);

      g_eqs[g_eqcnt].offset = parse_number(words[4]);
      g_eqcnt++;
      continue;
    }

    if (pi >= ARRAY_SIZE(ops))
      aerr("too many ops\n");

    parse_op(&ops[pi], words, wordc);
    pi++;
  }

  fclose(fout);
  fclose(fasm);
  fclose(fhdr);

  return 0;
}

// vim:ts=2:shiftwidth=2:expandtab