/*

 * Copyright 1997-2007 Sun Microsystems, Inc.  All Rights Reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

 * CA 95054 USA or visit www.sun.com if you need additional information or

 * have any questions.

 *

 */

// ADLPARSE.HPP - Definitions for Architecture Description Language Parser

// Authors: Chris Vick and Mike Paleczny

// Class List

class Form;

// ***** Top Level, 1, classes  *****

class InstructForm;

class OperandForm;

class OpClassForm;

class AttributeForm;

class RegisterForm;

class PipelineForm;

class SourceForm;

class Peephole;

// ***** Level 2 classes *****

class Component;

class Predicate;

class MatchRule;

class Encode;

class Attribute;

class Effect;

class ExpandRule;

class RewriteRule;

class Constraint;

class ConstructRule;

// ***** Register Section *****

class RegDef;

class RegClass;

class AllocClass;

class ResourceForm;

// ***** Pipeline Section *****

class PipeDesc;

class PipeClass;

class RegList;

// ***** Peephole Section *****

class PeepMatch;

class PeepConstraint;

class PeepReplace;

// class ostream; // ostream is a typedef in some systems

extern char *toUpper(const char *str);

//---------------------------ADLParser-----------------------------------------

class ADLParser {

protected:

  char     *_curline;           // Start of current line

  char     *_ptr;               // Pointer into current location in File Buffer

  int       _linenum;           // Count of line numbers seen so far

  char      _curchar;           // Current character from buffer

  FormDict &_globalNames;       // Global names

  enum { _preproc_limit = 20 };

  int       _preproc_depth;                 // How deep are we into ifdefs?

  int       _preproc_not_taken;             // How deep in not-taken ifdefs?

  bool      _preproc_taken[_preproc_limit]; // Are we taking this ifdef level?

  bool      _preproc_else[_preproc_limit];  // Did this level have an else yet?

  // ***** Level 1 Parse functions *****

  void instr_parse(void);       // Parse instruction definitions

  void oper_parse(void);        // Parse operand definitions

  void opclass_parse(void);     // Parse operand class definitions

  void ins_attr_parse(void);    // Parse instruction attrubute definitions

  void op_attr_parse(void);     // Parse operand attrubute definitions

  void source_parse(void);      // Parse source section

  void source_hpp_parse(void);  // Parse source_hpp section

  void reg_parse(void);         // Parse register section

  void encode_parse(void);      // Parse encoding section

  void frame_parse(void);       // Parse frame section

  void pipe_parse(void);        // Parse pipeline section

  void definitions_parse(void); // Parse definitions section

  void peep_parse(void);        // Parse peephole rule definitions

  void preproc_define(void);    // Parse a #define statement

  void preproc_undef(void);     // Parse an #undef statement

  // Helper functions for instr_parse().

  void adjust_set_rule(InstructForm *instr);

  void matchrule_clone_and_swap(MatchRule *rule, const char* instr_ident, int& match_rules_cnt);

  // ***** Level 2 Parse functions *****

  // Parse the components of the encode section

  void enc_class_parse(void);   // Parse encoding class definition

  void enc_class_parse_block(EncClass* encoding, char* ec_name);

  // Parse the components of the frame section

  void stack_dir_parse(FrameForm *frame);   // Parse the stack direction entry

  void sync_stack_slots_parse(FrameForm *frame);

  void frame_pointer_parse(FrameForm *frame, bool native);

  void interpreter_frame_pointer_parse(FrameForm *frame, bool native);

  void inline_cache_parse(FrameForm *frame, bool native);

  void interpreter_arg_ptr_parse(FrameForm *frame, bool native);

  void interpreter_method_oop_parse(FrameForm *frame, bool native);

  void cisc_spilling_operand_name_parse(FrameForm *frame, bool native);

  void stack_alignment_parse(FrameForm *frame);

  void return_addr_parse(FrameForm *frame, bool native);

  void preserve_stack_parse(FrameForm *frame);

  char *calling_convention_parse();

  char *return_value_parse();

  // Parse components of the register section

  void reg_def_parse(void);              // Parse register definition

  void reg_class_parse(void);            // Parse register class definition

  void alloc_class_parse(void);          // Parse allocation class definition

  // Parse components of the definition section

  void int_def_parse(void);              // Parse an integer definition

  // Parse components of a pipeline rule

  void resource_parse(PipelineForm &pipe);   // Parse resource definition

  void pipe_desc_parse(PipelineForm &pipe);  // Parse pipeline description definition

  void pipe_class_parse(PipelineForm &pipe); // Parse pipeline class definition

  // Parse components of a peephole rule

  void peep_match_parse(Peephole &peep);     // Parse the peephole match rule

  void peep_constraint_parse(Peephole &peep);// Parse the peephole constraints

  void peep_replace_parse(Peephole &peep);   // Parse peephole replacement rule

  // Parse the peep match rule tree

  InstructForm *peep_match_child_parse(PeepMatch &match, int parent, int &position, int input);

  // Parse components of an operand and/or instruction form

  Predicate     *pred_parse(void);       // Parse predicate rule

  // Parse match rule, and internal nodes

  MatchRule     *match_parse(FormDict &operands);

  MatchNode     *matchNode_parse(FormDict &operands, int &depth,

                                 int &numleaves, bool atroot);

  MatchNode     *matchChild_parse(FormDict &operands, int &depth,

                                  int &numleaves, bool atroot);

  Attribute     *attr_parse(char *ident);// Parse instr/operand attribute rule

  // Parse instruction encode rule

  InsEncode     *ins_encode_parse(InstructForm &inst);

  InsEncode     *ins_encode_parse_block(InstructForm &inst);

  Opcode        *opcode_parse(InstructForm *insr); // Parse instruction opcode

  char          *size_parse(InstructForm *insr); // Parse instruction size

  Interface     *interface_parse();      // Parse operand interface rule

  Interface     *mem_interface_parse();  // Parse memory interface rule

  Interface     *cond_interface_parse(); // Parse conditional interface rule

  char          *interface_field_parse();// Parse field contents

  FormatRule    *format_parse(void);     // Parse format rule

  void           effect_parse(InstructForm *instr); // Parse effect rule

  ExpandRule    *expand_parse(InstructForm *instr); // Parse expand rule

  RewriteRule   *rewrite_parse(void);    // Parse rewrite rule

  Constraint    *constraint_parse(void); // Parse constraint rule

  ConstructRule *construct_parse(void);  // Parse construct rule

  void           ins_pipe_parse(InstructForm &instr); // Parse ins_pipe rule

  // ***** Preprocessor functions *****

  void begin_if_def(bool taken) {

    assert(_preproc_depth < _preproc_limit, "#ifdef nesting limit");

    int ppn = _preproc_depth++;

    _preproc_taken[ppn] = taken;

    // Invariant:  _preproc_not_taken = SUM !_preproc_taken[0.._preproc_depth)

    if (!_preproc_taken[ppn])  _preproc_not_taken += 1;

    _preproc_else[ppn] = false;

  }

  void invert_if_def() {

    assert(_preproc_depth > 0, "#ifdef matching");

    int ppn = _preproc_depth - 1;

    assert(!_preproc_else[ppn], "multiple #else lines");

    _preproc_else[ppn] = true;

    if (!_preproc_taken[ppn])  _preproc_not_taken -= 1;

    _preproc_taken[ppn] = !_preproc_taken[ppn];

    if (!_preproc_taken[ppn])  _preproc_not_taken += 1;

  }

  void end_if_def() {

    assert(_preproc_depth > 0, "#ifdef matching");

    int ppn = --_preproc_depth;

    if (!_preproc_taken[ppn])  _preproc_not_taken -= 1;

  }

  bool preproc_taken() {

    // Return true only if there is no directive hiding this text position.

    return _preproc_not_taken == 0;

  }

  // Handle a '#' token.  Return true if it disappeared.

  bool handle_preproc_token();

  // ***** Utility Functions for ADL Parser ******

  // Parse one string argument inside parens:  '(' string ')' ';'

  char *parse_one_arg(const char *description);

  // Return the next identifier given a pointer into a line of the buffer.

  char *get_ident()            { return get_ident_common(true); }

  char *get_ident_no_preproc() { return get_ident_common(false); }

  char *get_ident_common(bool do_preproc);      // Grab it from the file buffer

  char *get_ident_dup(void);    // Grab a duplicate of the identifier

  char *get_ident_or_literal_constant(const char* description);

  // Grab unique identifier from file buffer

  char *get_unique_ident(FormDict &dict, const char *nameDescription);

  // Return the next replacement variable identifier

  char *get_rep_var_ident(void);

  // Skip first '$' and make a duplicate of the string

  char *get_rep_var_ident_dup(void);

  // Return the next token given as a signed integer.

  int   get_int(void);

  // Return the next token, a relational operator { ==, !=, <=, >= }

  char *get_relation_dup(void);

  void  get_oplist(NameList &parameters, FormDict &operands);// Parse type-operand pairs

  void  get_effectlist(FormDict &effects, FormDict &operands); // Parse effect-operand pairs

  // Return the contents of a parenthesized expression.

  // Requires initial '(' and consumes final ')', which is replaced by '\0'.

  char *get_paren_expr(const char *description);

  // Return expression up to next stop-char, which terminator replaces.

  // Does not require initial '('.  Does not consume final stop-char.

  // Final stop-char is left in _curchar, but is also is replaced by '\0'.

  char *get_expr(const char *description, const char *stop_chars);

  char *find_cpp_block(const char *description); // Parse a C++ code block

  // Issue parser error message & go to EOL

  void parse_err(int flag, const char *fmt, ...);

  // Return pointer to current character

  inline char  cur_char(void);

  // Advance to next character, assign this to _curchar

  inline void  next_char(void);

  inline void  next_char_or_line(void);

  // Advance File Buffer to next line, updating _curline

  inline void  next_line(void);

  // Issue an error if we are not at the beginning of a line (exc. whitespace).

  void ensure_start_of_line(void);

  // Issue an error if we are not at the end of a line (exc. whitespace).

  void ensure_end_of_line(void);

  // Skip whitespace, leaving ptr pointing to first non-whitespace character

  // Also handle preprocessor constructs like "#ifdef".

  void skipws()                { skipws_common(true); }

  // Skip comments and spaces but not newlines or preprocessor constructs.

  void skipws_no_preproc()     { skipws_common(false); }

  void skipws_common(bool do_preproc);

  FileBuff &_buf;               // File buffer to be parsed

  ArchDesc &_AD;                // Architecture Description being built

public:

  ADLParser(FileBuff &buf, ArchDesc &archDesc); // Create new ADLParser object

  ~ADLParser();                 // Destroy ADLParser object

  void parse(void);             // Do the parsing & build forms lists

  int getlines( ) { return _linenum; }

  static bool is_literal_constant(const char *hex_string);

  static bool is_hex_digit(char digit);

  static bool is_int_token(const char* token, int& intval);

  static void trim(char* &token);  // trim leading & trailing spaces

};