X-Git-Url: http://drtracing.org/?a=blobdiff_plain;f=gdb%2Fparser-defs.h;h=d6c3b068978efed010263ad85cdea2460344fd50;hb=975f8708de015fb2b813edbf8b714f4777c57a41;hp=c5c8077d2193371dc8bfba5537f9bcc5cf7ab74e;hpb=3d6b6a9075f0a0c84c342453889582df637d6b5c;p=deliverable%2Fbinutils-gdb.git

diff --git a/gdb/parser-defs.h b/gdb/parser-defs.h
index c5c8077d21..d6c3b06897 100644
--- a/gdb/parser-defs.h
+++ b/gdb/parser-defs.h
@@ -1,86 +1,275 @@
 /* Parser definitions for GDB.
-   Copyright (C) 1986, 1989, 1990, 1991 Free Software Foundation, Inc.
+
+   Copyright (C) 1986-2020 Free Software Foundation, Inc.
+
    Modified from expread.y by the Department of Computer Science at the
    State University of New York at Buffalo.
 
-This file is part of GDB.
+   This file is part of GDB.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program 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 for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+#if !defined (PARSER_DEFS_H)
+#define PARSER_DEFS_H 1
+
+#include "expression.h"
+#include "symtab.h"
 
-This program is free software; you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation; either version 2 of the License, or
-(at your option) any later version.
+struct block;
+struct language_defn;
+struct internalvar;
+class innermost_block_tracker;
 
-This program 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 for more details.
+extern bool parser_debug;
 
-You should have received a copy of the GNU General Public License
-along with this program; if not, write to the Free Software
-Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
+/* A class that can be used to build a "struct expression".  */
 
-struct std_regs {
-	char *name;
-	int regnum;
+struct expr_builder
+{
+  /* Constructor.  LANG is the language used to parse the expression.
+     And GDBARCH is the gdbarch to use during parsing.  */
+
+  expr_builder (const struct language_defn *lang,
+		struct gdbarch *gdbarch);
+
+  DISABLE_COPY_AND_ASSIGN (expr_builder);
+
+  /* Resize the allocated expression to the correct size, and return
+     it as an expression_up -- passing ownership to the caller.  */
+  ATTRIBUTE_UNUSED_RESULT expression_up release ();
+
+  /* Return the gdbarch that was passed to the constructor.  */
+
+  struct gdbarch *gdbarch ()
+  {
+    return expout->gdbarch;
+  }
+
+  /* Return the language that was passed to the constructor.  */
+
+  const struct language_defn *language ()
+  {
+    return expout->language_defn;
+  }
+
+  /* The size of the expression above.  */
+
+  size_t expout_size;
+
+  /* The expression related to this parser state.  */
+
+  expression_up expout;
+
+  /* The number of elements already in the expression.  This is used
+     to know where to put new elements.  */
+
+  size_t expout_ptr;
 };
 
-extern struct std_regs std_regs[];
-extern unsigned num_std_regs;
+/* This is used for expression completion.  */
 
-struct expression *expout;
-int expout_size;
-int expout_ptr;
+struct expr_completion_state
+{
+  /* The index of the last struct expression directly before a '.' or
+     '->'.  This is set when parsing and is only used when completing a
+     field name.  It is -1 if no dereference operation was found.  */
+  int expout_last_struct = -1;
 
-extern struct type *init_type ();
+  /* If we are completing a tagged type name, this will be nonzero.  */
+  enum type_code expout_tag_completion_type = TYPE_CODE_UNDEF;
 
-void write_exp_elt ();
-void write_exp_elt_opcode ();
-void write_exp_elt_sym ();
-void write_exp_elt_longcst ();
-void write_exp_elt_dblcst ();
-void write_exp_elt_type ();
-void write_exp_elt_intern ();
-void write_exp_string ();
-void start_arglist ();
-int end_arglist ();
-void free_funcalls ();
-char *copy_name ();
+  /* The token for tagged type name completion.  */
+  gdb::unique_xmalloc_ptr<char> expout_completion_name;
+};
 
-/* If this is nonzero, this block is used as the lexical context
-   for symbol names.  */
+/* An instance of this type is instantiated during expression parsing,
+   and passed to the appropriate parser.  It holds both inputs to the
+   parser, and result.  */
 
-struct block *expression_context_block;
+struct parser_state : public expr_builder
+{
+  /* Constructor.  LANG is the language used to parse the expression.
+     And GDBARCH is the gdbarch to use during parsing.  */
+
+  parser_state (const struct language_defn *lang,
+		struct gdbarch *gdbarch,
+		const struct block *context_block,
+		CORE_ADDR context_pc,
+		int comma,
+		const char *input,
+		int completion,
+		innermost_block_tracker *tracker)
+    : expr_builder (lang, gdbarch),
+      expression_context_block (context_block),
+      expression_context_pc (context_pc),
+      comma_terminates (comma),
+      lexptr (input),
+      parse_completion (completion),
+      block_tracker (tracker)
+  {
+  }
 
-/* The innermost context required by the stack and register variables
-   we've encountered so far. */
-struct block *innermost_block;
+  DISABLE_COPY_AND_ASSIGN (parser_state);
 
-/* The block in which the most recently discovered symbol was found. */
-struct block *block_found;
+  /* Begin counting arguments for a function call,
+     saving the data about any containing call.  */
 
-/* Number of arguments seen so far in innermost function call.  */
-int arglist_len;
+  void start_arglist ()
+  {
+    m_funcall_chain.push_back (arglist_len);
+    arglist_len = 0;
+  }
 
-/* Data structure for saving values of arglist_len
-   for function calls whose arguments contain other function calls.  */
+  /* Return the number of arguments in a function call just terminated,
+     and restore the data for the containing function call.  */
 
-struct funcall
+  int end_arglist ()
   {
-    struct funcall *next;
-    int arglist_len;
-  };
+    int val = arglist_len;
+    arglist_len = m_funcall_chain.back ();
+    m_funcall_chain.pop_back ();
+    return val;
+  }
+
+  /* Mark the current index as the starting location of a structure
+     expression.  This is used when completing on field names.  */
+
+  void mark_struct_expression ();
+
+  /* Indicate that the current parser invocation is completing a tag.
+     TAG is the type code of the tag, and PTR and LENGTH represent the
+     start of the tag name.  */
+
+  void mark_completion_tag (enum type_code tag, const char *ptr, int length);
+
+
+  /* If this is nonzero, this block is used as the lexical context for
+     symbol names.  */
+
+  const struct block * const expression_context_block;
+
+  /* If expression_context_block is non-zero, then this is the PC
+     within the block that we want to evaluate expressions at.  When
+     debugging C or C++ code, we use this to find the exact line we're
+     at, and then look up the macro definitions active at that
+     point.  */
+  const CORE_ADDR expression_context_pc;
+
+  /* Nonzero means stop parsing on first comma (if not within parentheses).  */
+
+  int comma_terminates;
+
+  /* During parsing of a C expression, the pointer to the next character
+     is in this variable.  */
 
-struct funcall *funcall_chain;
+  const char *lexptr;
 
-/* This kind of datum is used to represent the name
-   of a symbol token.  */
+  /* After a token has been recognized, this variable points to it.
+     Currently used only for error reporting.  */
+  const char *prev_lexptr = nullptr;
+
+  /* Number of arguments seen so far in innermost function call.  */
+
+  int arglist_len = 0;
+
+  /* True if parsing an expression to attempt completion.  */
+  int parse_completion;
+
+  /* Completion state is updated here.  */
+  expr_completion_state m_completion_state;
+
+  /* The innermost block tracker.  */
+  innermost_block_tracker *block_tracker;
+
+private:
+
+  /* Data structure for saving values of arglist_len for function calls whose
+     arguments contain other function calls.  */
+
+  std::vector<int> m_funcall_chain;
+};
+
+/* When parsing expressions we track the innermost block that was
+   referenced.  */
+
+class innermost_block_tracker
+{
+public:
+  innermost_block_tracker (innermost_block_tracker_types types
+			   = INNERMOST_BLOCK_FOR_SYMBOLS)
+    : m_types (types),
+      m_innermost_block (NULL)
+  { /* Nothing.  */ }
+
+  /* Update the stored innermost block if the new block B is more inner
+     than the currently stored block, or if no block is stored yet.  The
+     type T tells us whether the block B was for a symbol or for a
+     register.  The stored innermost block is only updated if the type T is
+     a type we are interested in, the types we are interested in are held
+     in M_TYPES and set during RESET.  */
+  void update (const struct block *b, innermost_block_tracker_types t);
+
+  /* Overload of main UPDATE method which extracts the block from BS.  */
+  void update (const struct block_symbol &bs)
+  {
+    update (bs.block, INNERMOST_BLOCK_FOR_SYMBOLS);
+  }
+
+  /* Return the stored innermost block.  Can be nullptr if no symbols or
+     registers were found during an expression parse, and so no innermost
+     block was defined.  */
+  const struct block *block () const
+  {
+    return m_innermost_block;
+  }
+
+private:
+  /* The type of innermost block being looked for.  */
+  innermost_block_tracker_types m_types;
+
+  /* The currently stored innermost block found while parsing an
+     expression.  */
+  const struct block *m_innermost_block;
+};
+
+/* A string token, either a char-string or bit-string.  Char-strings are
+   used, for example, for the names of symbols.  */
 
 struct stoken
   {
+    /* Pointer to first byte of char-string or first bit of bit-string.  */
+    const char *ptr;
+    /* Length of string in bytes for char-string or bits for bit-string.  */
+    int length;
+  };
+
+struct typed_stoken
+  {
+    /* A language-specific type field.  */
+    int type;
+    /* Pointer to first byte of char-string or first bit of bit-string.  */
     char *ptr;
+    /* Length of string in bytes for char-string or bits for bit-string.  */
     int length;
   };
 
+struct stoken_vector
+  {
+    int len;
+    struct typed_stoken *tokens;
+  };
+
 struct ttype
   {
     struct stoken stoken;
@@ -90,50 +279,82 @@ struct ttype
 struct symtoken
   {
     struct stoken stoken;
-    struct symbol *sym;
+    struct block_symbol sym;
     int is_a_field_of_this;
   };
 
-/* For parsing of complicated types.
-   An array should be preceded in the list by the size of the array.  */
-enum type_pieces
-  {tp_end = -1, tp_pointer, tp_reference, tp_array, tp_function};
-/* The stack can contain either an enum type_pieces or an int.  */
-union type_stack_elt {
-  enum type_pieces piece;
-  int int_val;
-};
-union type_stack_elt *type_stack;
-int type_stack_depth, type_stack_size;
+struct objc_class_str
+  {
+    struct stoken stoken;
+    struct type *type;
+    int theclass;
+  };
+
+/* Reverse an expression from suffix form (in which it is constructed)
+   to prefix form (in which we can conveniently print or execute it).
+   Ordinarily this always returns -1.  However, if LAST_STRUCT
+   is not -1 (i.e., we are trying to complete a field name), it will
+   return the index of the subexpression which is the left-hand-side
+   of the struct operation at LAST_STRUCT.  */
+
+extern int prefixify_expression (struct expression *expr,
+				 int last_struct = -1);
+
+extern void write_exp_elt_opcode (struct expr_builder *, enum exp_opcode);
+
+extern void write_exp_elt_sym (struct expr_builder *, struct symbol *);
+
+extern void write_exp_elt_longcst (struct expr_builder *, LONGEST);
+
+extern void write_exp_elt_floatcst (struct expr_builder *, const gdb_byte *);
+
+extern void write_exp_elt_type (struct expr_builder *, struct type *);
+
+extern void write_exp_elt_intern (struct expr_builder *, struct internalvar *);
 
-void push_type ();
-void push_type_int ();
-enum type_pieces pop_type ();
-int pop_type_int ();
+extern void write_exp_string (struct expr_builder *, struct stoken);
 
-/* During parsing of a C expression, the pointer to the next character
-   is in this variable.  */
+void write_exp_string_vector (struct expr_builder *, int type,
+			      struct stoken_vector *vec);
 
-char *lexptr;
+extern void write_exp_bitstring (struct expr_builder *, struct stoken);
 
-/* Tokens that refer to names do so with explicit pointer and length,
-   so they can share the storage that lexptr is parsing.
+extern void write_exp_elt_block (struct expr_builder *, const struct block *);
 
-   When it is necessary to pass a name to a function that expects
-   a null-terminated string, the substring is copied out
-   into a block of storage that namecopy points to.
+extern void write_exp_elt_objfile (struct expr_builder *,
+				   struct objfile *objfile);
 
-   namecopy is allocated once, guaranteed big enough, for each parsing.  */
+extern void write_exp_msymbol (struct expr_builder *,
+			       struct bound_minimal_symbol);
 
-char *namecopy;
+extern void write_dollar_variable (struct parser_state *, struct stoken str);
 
-/* Current depth in parentheses within the expression.  */
+extern const char *find_template_name_end (const char *);
 
-int paren_depth;
+extern std::string copy_name (struct stoken);
 
-/* Nonzero means stop parsing on first comma (if not within parentheses).  */
+extern int dump_subexp (struct expression *, struct ui_file *, int);
 
-int comma_terminates;
+extern int dump_subexp_body_standard (struct expression *, 
+				      struct ui_file *, int);
+
+extern void operator_length (const struct expression *, int, int *, int *);
+
+extern void operator_length_standard (const struct expression *, int, int *,
+				      int *);
+
+extern int operator_check_standard (struct expression *exp, int pos,
+				    int (*objfile_func)
+				      (struct objfile *objfile, void *data),
+				    void *data);
+
+extern const char *op_name_standard (enum exp_opcode);
+
+extern void null_post_parser (expression_up *, int, int,
+			      innermost_block_tracker *);
+
+extern bool parse_float (const char *p, int len,
+			 const struct type *type, gdb_byte *data);
 
 /* These codes indicate operator precedences for expression printing,
    least tightly binding first.  */
@@ -144,19 +365,90 @@ int comma_terminates;
    they are used as the "surrounding precedence" to force
    various kinds of things to be parenthesized.  */
 enum precedence
-{ PREC_NULL, PREC_COMMA, PREC_ABOVE_COMMA, PREC_ASSIGN, PREC_OR, PREC_AND,
-  PREC_LOGIOR, PREC_LOGAND, PREC_LOGXOR, PREC_EQUAL, PREC_ORDER,
-  PREC_SHIFT, PREC_ADD, PREC_MUL, PREC_REPEAT,
-  PREC_HYPER, PREC_PREFIX, PREC_SUFFIX };
+  {
+    PREC_NULL, PREC_COMMA, PREC_ABOVE_COMMA, PREC_ASSIGN, PREC_LOGICAL_OR,
+    PREC_LOGICAL_AND, PREC_BITWISE_IOR, PREC_BITWISE_AND, PREC_BITWISE_XOR,
+    PREC_EQUAL, PREC_ORDER, PREC_SHIFT, PREC_ADD, PREC_MUL, PREC_REPEAT,
+    PREC_HYPER, PREC_PREFIX, PREC_SUFFIX, PREC_BUILTIN_FUNCTION
+  };
 
 /* Table mapping opcodes into strings for printing operators
    and precedences of the operators.  */
 
 struct op_print
-{
-  char *string;
-  enum exp_opcode opcode;
-  /* Precedence of operator.  These values are used only by comparisons.  */
-  enum precedence precedence;
-  int right_assoc;
-};
+  {
+    const char *string;
+    enum exp_opcode opcode;
+    /* Precedence of operator.  These values are used only by comparisons.  */
+    enum precedence precedence;
+
+    /* For a binary operator:  1 iff right associate.
+       For a unary operator:  1 iff postfix.  */
+    int right_assoc;
+  };
+
+/* Information needed to print, prefixify, and evaluate expressions for 
+   a given language.  */
+
+struct exp_descriptor
+  {
+    /* Print subexpression.  */
+    void (*print_subexp) (struct expression *, int *, struct ui_file *,
+			  enum precedence);
+
+    /* Returns number of exp_elements needed to represent an operator and
+       the number of subexpressions it takes.  */
+    void (*operator_length) (const struct expression*, int, int*, int *);
+
+    /* Call OBJFILE_FUNC for any objfile found being referenced by the
+       single operator of EXP at position POS.  Operator parameters are
+       located at positive (POS + number) offsets in EXP.  OBJFILE_FUNC
+       should never be called with NULL OBJFILE.  OBJFILE_FUNC should
+       get passed an arbitrary caller supplied DATA pointer.  If it
+       returns non-zero value then (any other) non-zero value should be
+       immediately returned to the caller.  Otherwise zero should be
+       returned.  */
+    int (*operator_check) (struct expression *exp, int pos,
+			   int (*objfile_func) (struct objfile *objfile,
+						void *data),
+			   void *data);
+
+    /* Name of this operator for dumping purposes.
+       The returned value should never be NULL, even if EXP_OPCODE is
+       an unknown opcode (a string containing an image of the numeric
+       value of the opcode can be returned, for instance).  */
+    const char *(*op_name) (enum exp_opcode);
+
+    /* Dump the rest of this (prefix) expression after the operator
+       itself has been printed.  See dump_subexp_body_standard in
+       (expprint.c).  */
+    int (*dump_subexp_body) (struct expression *, struct ui_file *, int);
+
+    /* Evaluate an expression.  */
+    struct value *(*evaluate_exp) (struct type *, struct expression *,
+				   int *, enum noside);
+  };
+
+
+/* Default descriptor containing standard definitions of all
+   elements.  */
+extern const struct exp_descriptor exp_descriptor_standard;
+
+/* Functions used by language-specific extended operators to (recursively)
+   print/dump subexpressions.  */
+
+extern void print_subexp (struct expression *, int *, struct ui_file *,
+			  enum precedence);
+
+extern void print_subexp_standard (struct expression *, int *, 
+				   struct ui_file *, enum precedence);
+
+/* Function used to avoid direct calls to fprintf
+   in the code generated by the bison parser.  */
+
+extern void parser_fprintf (FILE *, const char *, ...) ATTRIBUTE_PRINTF (2, 3);
+
+extern int exp_uses_objfile (struct expression *exp, struct objfile *objfile);
+
+#endif /* PARSER_DEFS_H */
+