X-Git-Url: http://git.efficios.com/?a=blobdiff_plain;f=gdb%2Fparser-defs.h;h=c67b8d5691b6c2abe7fba375a3e347be5622ba13;hb=d7e15655a40e9133a1cbf53ea071f82cd6745ac8;hp=3f743d15bed3fb5ff5538fd4a6510532be0b49b2;hpb=0df8b4180acb4890d058c92753dafcd4ff0a87d1;p=deliverable%2Fbinutils-gdb.git diff --git a/gdb/parser-defs.h b/gdb/parser-defs.h index 3f743d15be..c67b8d5691 100644 --- a/gdb/parser-defs.h +++ b/gdb/parser-defs.h @@ -1,8 +1,6 @@ /* Parser definitions for GDB. - Copyright (C) 1986, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, - 1998, 1999, 2000, 2002, 2007, 2008, 2009, 2010, 2011 - Free Software Foundation, Inc. + Copyright (C) 1986-2018 Free Software Foundation, Inc. Modified from expread.y by the Department of Computer Science at the State University of New York at Buffalo. @@ -25,23 +23,51 @@ #if !defined (PARSER_DEFS_H) #define PARSER_DEFS_H 1 -#include "doublest.h" +#include "vec.h" +#include "expression.h" struct block; +struct language_defn; +struct internalvar; extern int parser_debug; -extern struct expression *expout; -extern int expout_size; -extern int expout_ptr; +#define parse_gdbarch(ps) ((ps)->expout->gdbarch) +#define parse_language(ps) ((ps)->expout->language_defn) -#define parse_gdbarch (expout->gdbarch) -#define parse_language (expout->language_defn) +struct parser_state +{ + /* 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. */ + + parser_state (size_t initial_size, const struct language_defn *lang, + struct gdbarch *gdbarch); + + DISABLE_COPY_AND_ASSIGN (parser_state); + + /* Resize the allocated expression to the correct size, and return + it as an expression_up -- passing ownership to the caller. */ + expression_up release (); + + /* 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; +}; /* If this is nonzero, this block is used as the lexical context for symbol names. */ -extern struct block *expression_context_block; +extern const struct block *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 @@ -49,14 +75,80 @@ extern struct block *expression_context_block; then look up the macro definitions active at that point. */ extern CORE_ADDR expression_context_pc; -/* The innermost context required by the stack and register variables - we've encountered so far. */ -extern struct block *innermost_block; +/* While parsing expressions we need to track the innermost lexical block + that we encounter. In some situations we need to track the innermost + block just for symbols, and in other situations we want to track the + innermost block for symbols and registers. These flags are used by the + innermost block tracker to control which blocks we consider for the + innermost block. These flags can be combined together as needed. */ + +enum innermost_block_tracker_type +{ + /* Track the innermost block for symbols within an expression. */ + INNERMOST_BLOCK_FOR_SYMBOLS = (1 << 0), + + /* Track the innermost block for registers within an expression. */ + INNERMOST_BLOCK_FOR_REGISTERS = (1 << 1) +}; +DEF_ENUM_FLAGS_TYPE (enum innermost_block_tracker_type, + innermost_block_tracker_types); + +/* When parsing expressions we track the innermost block that was + referenced. */ + +class innermost_block_tracker +{ +public: + innermost_block_tracker () + : m_types (INNERMOST_BLOCK_FOR_SYMBOLS), + m_innermost_block (NULL) + { /* Nothing. */ } + + /* Reset the currently stored innermost block. Usually called before + parsing a new expression. As the most common case is that we only + want to gather the innermost block for symbols in an expression, this + becomes the default block tracker type. */ + void reset (innermost_block_tracker_types t = INNERMOST_BLOCK_FOR_SYMBOLS) + { + m_types = t; + m_innermost_block = NULL; + } + + /* 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 block in which the most recently discovered symbol was found. - FIXME: Should be declared along with lookup_symbol in symtab.h; is not - related specifically to parsing. */ -extern struct block *block_found; + /* The currently stored innermost block found while parsing an + expression. */ + const struct block *m_innermost_block; +}; + +/* The innermost context required by the stack and register variables + we've encountered so far. This should be cleared before parsing an + expression, and queried once the parse is complete. */ +extern innermost_block_tracker innermost_block; /* Number of arguments seen so far in innermost function call. */ extern int arglist_len; @@ -67,7 +159,7 @@ extern int arglist_len; struct stoken { /* Pointer to first byte of char-string or first bit of bit-string. */ - char *ptr; + const char *ptr; /* Length of string in bytes for char-string or bits for bit-string. */ int length; }; @@ -97,7 +189,7 @@ struct ttype struct symtoken { struct stoken stoken; - struct symbol *sym; + struct block_symbol sym; int is_a_field_of_this; }; @@ -105,9 +197,11 @@ struct objc_class_str { struct stoken stoken; struct type *type; - int class; + 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. */ @@ -116,54 +210,77 @@ enum type_pieces tp_end = -1, tp_pointer, tp_reference, + tp_rvalue_reference, tp_array, - tp_function, + tp_function, + tp_function_with_arguments, tp_const, tp_volatile, - tp_space_identifier + 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; }; -extern union type_stack_elt *type_stack; -extern int type_stack_depth, type_stack_size; -extern void write_exp_elt (union exp_element); +/* 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; +}; -extern void write_exp_elt_opcode (enum exp_opcode); +/* 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 + 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. */ -extern void write_exp_elt_sym (struct symbol *); +extern int prefixify_expression (struct expression *expr); -extern void write_exp_elt_longcst (LONGEST); +extern void write_exp_elt_opcode (struct parser_state *, enum exp_opcode); -extern void write_exp_elt_dblcst (DOUBLEST); +extern void write_exp_elt_sym (struct parser_state *, struct symbol *); -extern void write_exp_elt_decfloatcst (gdb_byte *); +extern void write_exp_elt_longcst (struct parser_state *, LONGEST); -extern void write_exp_elt_type (struct type *); +extern void write_exp_elt_floatcst (struct parser_state *, const gdb_byte *); -extern void write_exp_elt_intern (struct internalvar *); +extern void write_exp_elt_type (struct parser_state *, struct type *); -extern void write_exp_string (struct stoken); +extern void write_exp_elt_intern (struct parser_state *, struct internalvar *); -void write_exp_string_vector (int type, struct stoken_vector *vec); +extern void write_exp_string (struct parser_state *, struct stoken); -extern void write_exp_bitstring (struct stoken); +void write_exp_string_vector (struct parser_state *, int type, + struct stoken_vector *vec); -extern void write_exp_elt_block (struct block *); +extern void write_exp_bitstring (struct parser_state *, struct stoken); -extern void write_exp_elt_objfile (struct objfile *objfile); +extern void write_exp_elt_block (struct parser_state *, const struct block *); -extern void write_exp_msymbol (struct minimal_symbol *); +extern void write_exp_elt_objfile (struct parser_state *, + struct objfile *objfile); -extern void write_dollar_variable (struct stoken str); +extern void write_exp_msymbol (struct parser_state *, + struct bound_minimal_symbol); -extern void mark_struct_expression (void); +extern void write_dollar_variable (struct parser_state *, struct stoken str); -extern char *find_template_name_end (char *); +extern void mark_struct_expression (struct parser_state *); + +extern const char *find_template_name_end (const char *); extern void start_arglist (void); @@ -171,17 +288,28 @@ 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 push_type_address_space (char *); +extern void insert_type_address_space (struct parser_state *, char *); extern enum type_pieces pop_type (void); extern int pop_type_int (void); -extern int length_of_subexp (struct expression *, int); +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 int dump_subexp (struct expression *, struct ui_file *, int); @@ -198,37 +326,25 @@ extern int operator_check_standard (struct expression *exp, int pos, (struct objfile *objfile, void *data), void *data); -extern char *op_name_standard (enum exp_opcode); +extern const char *op_name_standard (enum exp_opcode); extern struct type *follow_types (struct type *); -extern void null_post_parser (struct expression **, int); +extern type_instance_flags follow_type_instance_flags (); -extern int parse_float (const char *p, int len, DOUBLEST *d, - const char **suffix); +extern void null_post_parser (expression_up *, int); -extern int parse_c_float (struct gdbarch *gdbarch, const char *p, int len, - DOUBLEST *d, struct type **t); +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 char *lexptr; +extern const char *lexptr; /* After a token has been recognized, this variable points to it. Currently used only for error reporting. */ -extern char *prev_lexptr; - -/* Tokens that refer to names do so with explicit pointer and length, - so they can share the storage that lexptr is parsing. - - 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. - - namecopy is allocated once, guaranteed big enough, for each parsing. */ - -extern char *namecopy; +extern const char *prev_lexptr; /* Current depth in parentheses within the expression. */ @@ -259,7 +375,7 @@ enum precedence struct op_print { - char *string; + const char *string; enum exp_opcode opcode; /* Precedence of operator. These values are used only by comparisons. */ enum precedence precedence; @@ -282,21 +398,24 @@ struct exp_descriptor the number of subexpressions it takes. */ void (*operator_length) (const struct expression*, int, int*, int *); - /* Call TYPE_FUNC and OBJFILE_FUNC for any TYPE and OBJFILE found being - referenced by the single operator of EXP at position POS. Operator - parameters are located at positive (POS + number) offsets in EXP. - The functions should never be called with NULL TYPE or NULL OBJFILE. - Functions should get passed an arbitrary caller supplied DATA pointer. - If any of the functions returns non-zero value then (any other) non-zero - value should be immediately returned to the caller. Otherwise zero - should be returned. */ + /* 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. */ - char *(*op_name) (enum exp_opcode); + /* 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 @@ -329,4 +448,14 @@ extern void parser_fprintf (FILE *, const char *, ...) ATTRIBUTE_PRINTF (2, 3); 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 */ +