ubsan: bpf: left shift cannot be represented in type 'DI' (aka 'long')

[deliverable/binutils-gdb.git] / gdb / parser-defs.h

diff --git a/gdb/parser-defs.h b/gdb/parser-defs.h
index 907a79811a19439e048cf2242b2ec461b896edda..b6c77534f699e5e9b0a3015a54c2843550811c9b 100644 (file)
--- a/gdb/parser-defs.h
+++ b/gdb/parser-defs.h
@@ -1,6 +1,6 @@
 /* Parser definitions for GDB.
 
 /* Parser definitions for GDB.
 

-   Copyright (C) 1986-2017 Free Software Foundation, Inc.
+   Copyright (C) 1986-2019 Free Software Foundation, Inc.

 
    Modified from expread.y by the Department of Computer Science at the
    State University of New York at Buffalo.
 
    Modified from expread.y by the Department of Computer Science at the
    State University of New York at Buffalo.


@@ -23,32 +23,45 @@
 #if !defined (PARSER_DEFS_H)
 #define PARSER_DEFS_H 1
 
 #if !defined (PARSER_DEFS_H)
 #define PARSER_DEFS_H 1
 

-#include "vec.h"

 #include "expression.h"
 #include "expression.h"

+#include "symtab.h"

 
 struct block;
 struct language_defn;
 struct internalvar;
 
 struct block;
 struct language_defn;
 struct internalvar;

+class innermost_block_tracker;

 
 

-extern int parser_debug;
+extern bool parser_debug;

 
 

-#define parse_gdbarch(ps) ((ps)->expout->gdbarch)
-#define parse_language(ps) ((ps)->expout->language_defn)
+/* A class that can be used to build a "struct expression".  */

 
 

-struct parser_state
+struct expr_builder

 {
 {

-  /* Constructor.  INITIAL_SIZE is the initial size of the expout
-     array.  LANG is the language used to parse the expression.  And
-     GDBARCH is the gdbarch to use during parsing.  */
+  /* Constructor.  LANG is the language used to parse the expression.
+     And GDBARCH is the gdbarch to use during parsing.  */

 
 

-  parser_state (size_t initial_size, const struct language_defn *lang,
+  expr_builder (const struct language_defn *lang,

                struct gdbarch *gdbarch);
 
                struct gdbarch *gdbarch);
 

-  DISABLE_COPY_AND_ASSIGN (parser_state);
+  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.  */
 
   /* Resize the allocated expression to the correct size, and return
      it as an expression_up -- passing ownership to the caller.  */

-  expression_up release ();
+  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.  */
 
 
   /* The size of the expression above.  */
 


@@ -64,23 +77,171 @@ struct parser_state
   size_t expout_ptr;
 };
 
   size_t expout_ptr;
 };
 

-/* If this is nonzero, this block is used as the lexical context
-   for symbol names.  */
+/* This is used for expression completion.  */
+
+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;
+
+  /* If we are completing a tagged type name, this will be nonzero.  */
+  enum type_code expout_tag_completion_type = TYPE_CODE_UNDEF;
+
+  /* The token for tagged type name completion.  */
+  gdb::unique_xmalloc_ptr<char> expout_completion_name;
+};
+
+/* 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 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)
+  {
+  }
+
+  DISABLE_COPY_AND_ASSIGN (parser_state);
+
+  /* Begin counting arguments for a function call,
+     saving the data about any containing call.  */
+
+  void start_arglist ()
+  {
+    m_funcall_chain.push_back (arglist_len);
+    arglist_len = 0;
+  }
+
+  /* Return the number of arguments in a function call just terminated,
+     and restore the data for the containing function call.  */

 
 

-extern const struct block *expression_context_block;
+  int end_arglist ()
+  {
+    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;

 
 

-/* 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.  */
-extern CORE_ADDR expression_context_pc;
+  /* During parsing of a C expression, the pointer to the next character
+     is in this variable.  */

 
 

-/* The innermost context required by the stack and register variables
-   we've encountered so far.  */
-extern const struct block *innermost_block;
+  const char *lexptr;

 
 

-/* Number of arguments seen so far in innermost function call.  */
-extern int arglist_len;
+  /* 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.  */
 
 /* A string token, either a char-string or bit-string.  Char-strings are
    used, for example, for the names of symbols.  */


@@ -129,116 +290,48 @@ struct objc_class_str
     int theclass;
   };
 
     int theclass;
   };
 

-typedef struct type *type_ptr;
-DEF_VEC_P (type_ptr);
-
-/* 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_rvalue_reference,
-    tp_array, 
-    tp_function,
-    tp_function_with_arguments,
-    tp_const, 
-    tp_volatile, 
-    tp_space_identifier,
-    tp_type_stack
-  };
-/* The stack can contain either an enum type_pieces or an int.  */
-union type_stack_elt
-  {
-    enum type_pieces piece;
-    int int_val;
-    struct type_stack *stack_val;
-    VEC (type_ptr) *typelist_val;
-  };
-
-/* The type stack is an instance of this structure.  */
-
-struct type_stack
-{
-  /* Elements on the stack.  */
-  union type_stack_elt *elements;
-  /* Current stack depth.  */
-  int depth;
-  /* Allocated size of stack.  */
-  int size;
-};
-

 /* Reverse an expression from suffix form (in which it is constructed)
    to prefix form (in which we can conveniently print or execute it).
 /* 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 EXPOUT_LAST_STRUCT
+   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
    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 EXPOUT_LAST_STRUCT.  */
+   of the struct operation at LAST_STRUCT.  */

 
 

-extern int prefixify_expression (struct expression *expr);
+extern int prefixify_expression (struct expression *expr,
+                                int last_struct = -1);

 
 

-extern void write_exp_elt_opcode (struct parser_state *, enum exp_opcode);
+extern void write_exp_elt_opcode (struct expr_builder *, enum exp_opcode);

 
 

-extern void write_exp_elt_sym (struct parser_state *, struct symbol *);
+extern void write_exp_elt_sym (struct expr_builder *, struct symbol *);

 
 

-extern void write_exp_elt_longcst (struct parser_state *, LONGEST);
+extern void write_exp_elt_longcst (struct expr_builder *, LONGEST);

 
 

-extern void write_exp_elt_floatcst (struct parser_state *, const gdb_byte *);
+extern void write_exp_elt_floatcst (struct expr_builder *, const gdb_byte *);

 
 

-extern void write_exp_elt_type (struct parser_state *, struct type *);
+extern void write_exp_elt_type (struct expr_builder *, struct type *);

 
 

-extern void write_exp_elt_intern (struct parser_state *, struct internalvar *);
+extern void write_exp_elt_intern (struct expr_builder *, struct internalvar *);

 
 

-extern void write_exp_string (struct parser_state *, struct stoken);
+extern void write_exp_string (struct expr_builder *, struct stoken);

 
 

-void write_exp_string_vector (struct parser_state *, int type,
+void write_exp_string_vector (struct expr_builder *, int type,

                              struct stoken_vector *vec);
 
                              struct stoken_vector *vec);
 

-extern void write_exp_bitstring (struct parser_state *, struct stoken);
+extern void write_exp_bitstring (struct expr_builder *, struct stoken);

 
 

-extern void write_exp_elt_block (struct parser_state *, const struct block *);
+extern void write_exp_elt_block (struct expr_builder *, const struct block *);

 
 

-extern void write_exp_elt_objfile (struct parser_state *,
+extern void write_exp_elt_objfile (struct expr_builder *,

                                   struct objfile *objfile);
 
                                   struct objfile *objfile);
 

-extern void write_exp_msymbol (struct parser_state *,
+extern void write_exp_msymbol (struct expr_builder *,

                               struct bound_minimal_symbol);
 
 extern void write_dollar_variable (struct parser_state *, struct stoken str);
 
                               struct bound_minimal_symbol);
 
 extern void write_dollar_variable (struct parser_state *, struct stoken str);
 

-extern void mark_struct_expression (struct parser_state *);
-

 extern const char *find_template_name_end (const char *);
 
 extern const char *find_template_name_end (const char *);
 

-extern void start_arglist (void);
-
-extern int end_arglist (void);
-
-extern char *copy_name (struct stoken);
-
-extern void insert_type (enum type_pieces);
-
-extern void push_type (enum type_pieces);
-
-extern void push_type_int (int);
-
-extern void insert_type_address_space (struct parser_state *, char *);
-
-extern enum type_pieces pop_type (void);
-
-extern int pop_type_int (void);
-
-extern struct type_stack *get_type_stack (void);
-
-extern struct type_stack *append_type_stack (struct type_stack *to,
-                                            struct type_stack *from);
-
-extern void push_type_stack (struct type_stack *stack);
-
-extern void type_stack_cleanup (void *arg);
-
-extern void push_typelist (VEC (type_ptr) *typelist);
+extern std::string copy_name (struct stoken);

 
 extern int dump_subexp (struct expression *, struct ui_file *, int);
 
 
 extern int dump_subexp (struct expression *, struct ui_file *, int);
 


@@ -257,31 +350,11 @@ extern int operator_check_standard (struct expression *exp, int pos,
 
 extern const char *op_name_standard (enum exp_opcode);
 
 
 extern const char *op_name_standard (enum exp_opcode);
 

-extern struct type *follow_types (struct type *);
-
-extern type_instance_flags follow_type_instance_flags ();
-
-extern void null_post_parser (expression_up *, int);
+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);
 
 extern bool parse_float (const char *p, int len,
                         const struct type *type, gdb_byte *data);

-
-/* During parsing of a C expression, the pointer to the next character
-   is in this variable.  */
-
-extern const char *lexptr;
-
-/* After a token has been recognized, this variable points to it.
-   Currently used only for error reporting.  */
-extern const char *prev_lexptr;
-
-/* Current depth in parentheses within the expression.  */
-
-extern int paren_depth;
-
-/* Nonzero means stop parsing on first comma (if not within parentheses).  */
-
-extern int comma_terminates;

 \f
 /* These codes indicate operator precedences for expression printing,
    least tightly binding first.  */
 \f
 /* These codes indicate operator precedences for expression printing,
    least tightly binding first.  */


@@ -377,14 +450,5 @@ extern void parser_fprintf (FILE *, const char *, ...) ATTRIBUTE_PRINTF (2, 3);
 
 extern int exp_uses_objfile (struct expression *exp, struct objfile *objfile);
 
 
 extern int exp_uses_objfile (struct expression *exp, struct objfile *objfile);
 

-extern void mark_completion_tag (enum type_code, const char *ptr,
-                                int length);
-
-/* Reallocate the `expout' pointer inside PS so that it can accommodate
-   at least LENELT expression elements.  This function does nothing if
-   there is enough room for the elements.  */
-
-extern void increase_expout_size (struct parser_state *ps, size_t lenelt);
-

 #endif /* PARSER_DEFS_H */
 
 #endif /* PARSER_DEFS_H */