LocChk.cxx

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#include <assert.h>
#include <stdint.h>
#include <stdlib.h>
#include <dirent.h>
#include <fstream>
#include <iostream>
#include <string>
#include <sstream>

#include <libsherpa/UExcept.hxx>

#include "AST.hxx"
#include "Type.hxx"
#include "inter-pass.hxx"

using namespace boost;
using namespace sherpa;

static bool
LocChk(std::ostream &errStream, bool &errFree, shared_ptr<AST> ast, bool inSET)
{
  switch (ast->astType) {
  case at_ident:
    {
      return true;
    }
    
    //case at_array:
    //case at_vector:
  case at_vector_nth:
  case at_deref:
    {
      // Need to recurse because we need to perform the location check
      // within the expression that produces the value.
      for (size_t c = 0; c < ast->children.size(); c++)
        LocChk(errStream, errFree, ast->child(c), false);
       
      return true;
    }

  case at_setbang:
    {
      bool isLoc = LocChk(errStream, errFree, ast->child(0), true);
      LocChk(errStream, errFree, ast->child(1), inSET);

      if (!isLoc) {
        errStream << ast->child(0)->loc << ": "
                  << "Non-location in set! context"
                  << std::endl;
        errFree = false;
      }

      return false;
    }

  case at_array_nth:
    {
      bool isLoc = LocChk(errStream, errFree, ast->child(0), inSET);
      if (inSET && !isLoc) {
        errStream << ast->child(0)->loc << ": "
                  << "Non-location in set! context"
                  << std::endl;
        errFree = false;
      }

      return true;
    }

  case at_fqCtr:
    {
      return true;
    }

  case at_select:
    {
      bool isLoc = LocChk(errStream, errFree, ast->child(0), inSET);
      
      if (inSET && !isLoc && !ast->child(0)->symType->isRefType()) {
        errStream << ast->child(0)->loc << ": "
                  << "Non-location in set! context"
                  << std::endl;
        errFree = false;
      }
      
      return true;
    }

  case at_sel_ctr:
    {
      LocChk(errStream, errFree, ast->child(0), inSET);
      return false;
    }

  case at_uswitch:
  case at_try:
    {
      for (size_t c = 0; c < ast->children.size(); c++)
        if (c != IGNORE(ast))
          LocChk(errStream, errFree, ast->child(c), inSET);
      
      return false;
    }
    
  default:
    {
      for (size_t c = 0; c < ast->children.size(); c++)
        LocChk(errStream, errFree, ast->child(c), inSET);

      return false;
    }
  }
}

bool
UocInfo::fe_locCheck(std::ostream& errStream, 
                     bool init, unsigned long flags)
{
  bool errFree = true;  
  LocChk(errStream, errFree, uocAst, false);  
  return errFree;
}

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