mipsy-parser-gen.py 5.66 KB
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#!/usr/bin/env python

import sys
import string, re

import mipsy
from mipsy import license, depth, define_id, class_id

parser = mipsy.InstructionSetParser()
instructions = parser.parse(sys.stdin)

#### Mipsy Bison parser generator --------------------------

## Prologue --------------------------
print "%{							// -*- C++ -*-"
print license
print """
#include <string>

#include \"common.hh\"

#include \"inst/label.hh\"
#include \"inst/program_builder.hh\"
#include \"inst/exp.hh\"
#include \"inst/register.hh\"
#include \"inst/all.hh\"

#include \"parse/libparse.hh\"

namespace yy
{
  extern inst::ProgramBuilder program_builder;
}

using namespace inst;
%}

%error-verbose
%locations
%debug

%union
{
  int			i;
  std::string		*s;
  inst::Label           *label;
  inst::Register        *reg;
  inst::Exp             *exp;
}
%{
#include \"parse/asm-scan.hh\"
%}

%token <label> LABEL		\"label\"
%token <label> LABEL_DEF	\"label definition\"
%token <i> INTEGER              \"integer\"
%token <s> STRING               \"string\"
%token <reg> REGISTER           \"register\"
%type <exp> exp

%token YYEOF		0 \"end of file\"
%token LPAREN		\"(\"
%token RPAREN		\")\"
%token COMMA		\",\"

%left EXP_ADD EXP_SUB
%left EXP_MUL EXP_DIV
%nonassoc EXP_UMINUS

%token DIR_TEXT         \".text\"
%token DIR_DATA         \".data\"
%token DIR_SPACE        \".space\"
%token DIR_WORD         \".word\"
%token DIR_ASCIIZ       \".asciiz\"
"""
  
for i in instructions:
  print "%token " + define_id(i.opcode) + '\t\t"' + i.opcode + '"'
  
print """
  
%start program
%%
// 
program
:
| program DIR_TEXT instructions
| program DIR_DATA datas


// Data definitions
datas
:
| datas data

data
// Label
:  LABEL_DEF
{ program_builder.add_data_label(* $1); }
// Reserve space
| DIR_SPACE INTEGER
{ program_builder.add_space ($2); }
// Values
| DIR_WORD INTEGER
{ program_builder.add_word ($2); }
| DIR_WORD LABEL
{ program_builder.add_word (*$2); }
| DIR_ASCIIZ STRING
{ program_builder.add_asciiz (* $2); }

// Instruction definitions
instructions
:
| instructions instruction

instruction
// Label
: LABEL_DEF
{ program_builder.add_inst_label(* $1); }

// Opcodes"""

  ## Body ------------------------------
token_map = {
  "register": "REGISTER",
  "immediate": "exp",
  "label": "LABEL",
  "address": "REGISTER",
  "hidden": ""
  }

for inst in instructions:
  for syntax in inst.syntaxes:

    ## Build paths from params
    paths = []
    for param in syntax.params:
      token = token_map[param.kind]
      if param.kind == "address":
        paths.append(["LPAREN"])
      else:
        paths.append(["COMMA"])

      if param.value != "":
        token = token + "=" + param.value
      if param.default != "":
        paths.append([token, "=" + param.default])
      else:
        paths.append([token])

      if param.kind == "address":
        paths.append(["RPAREN"])
    ## Expand paths
    paths = depth(paths)


    ## Add opcode and remove useless COMMAs (COMMA before default, etc.)
    prods = []
    if paths == []:
      prods = [[define_id(inst.opcode)]]
    for path in paths:
      prod = [define_id(inst.opcode)]
      for i in range(1, len(path)):
        token = path[i]
        if token == "COMMA":
          if ((i < len(path) - 2) and \
              (path[i + 1][0] == "=") and (path[i + 2] == "COMMA")) or \
              ((i == len(path) - 2) and (path[i + 1][0] == "=")) or \
              ((i == 2) and (path[1][0] == "=")):
            continue
        prod.append(token)
      prods.append(prod)
    
    ## Build action(s) from production(s)
    for prod in prods:
    
      ## Compute values of token
      values = []
      i = 0
      for token in prod:
        token = string.split(token, "=")[0]
        if token != "":
          i = i + 1
          if token in token_map.values():
            if token == "INTEGER":
              values = values + ["$" + str(i)]
            else:
              values = values + ["*$" + str(i)]

      ## Build action, expanding values
      if syntax.alias != "":
        action = syntax.alias + "("
      else:
        action = inst.opcode + "("
      i = 0
      rule = "|"
      for token in prod:
        l = string.split(token, "=")
        value = ""
        if len(l) > 1:
          value = re.sub(r"@([0-9]+)",
                         (lambda m: values[string.atoi(m.groups(0)[0])]),
                         l[1])
        if l[0] != "":
          rule = rule + " " + l[0]
        if value != "":
          action = action + value + ", "
        else:
          if l[0] in token_map.values():
            action = action + values[i] + ", "
            i = i + 1
      action = string.rstrip(action, ", ") + ")"
      
      ## Print production followed by action
      print rule
      print "{ program_builder.add_" + action + "; }"


## Epilogue --------------------------
print """
exp:
  exp EXP_ADD  exp { $$ = new OpExp(*$1, OpExp::add, *$3); }
| exp EXP_SUB  exp { $$ = new OpExp(*$1, OpExp::sub, *$3); }
| exp EXP_MUL  exp { $$ = new OpExp(*$1, OpExp::mul, *$3); }
| exp EXP_DIV  exp { $$ = new OpExp(*$1, OpExp::div, *$3); }
| EXP_SUB exp %prec EXP_UMINUS
        { $$ = new OpExp(*new IntExp(0), OpExp::sub, *$2); }
| LPAREN exp RPAREN { $$ = $2; }
| INTEGER { $$ = new IntExp($1); }
| LABEL { $$ = new LabelExp(*$1); }

%%
void
yy::Parser::error_ ()
{
  std::cerr << location << \": \" << message << std::endl;
  exit_set (exit_parse);
}

void
yy::Parser::print_ ()
{
  std::cerr << ' ' << location;
  switch (looka_)
    {
    case STRING:
      std::cerr << \": \" << *value.s;
      break;
    case INTEGER:
      std::cerr << \": \" << value.i;
      break;
    case REGISTER:
      std::cerr << \": \" << *value.reg;
      break;
    }
}

namespace yy
{
  inst::ProgramBuilder program_builder;
}
"""