X-Git-Url: http://git.efficios.com/?a=blobdiff_plain;f=gdb%2Fparser-defs.h;h=e58dc12303f57539155c41920ded20802b23e4bb;hb=224506e95d2d44aa6583cbcda9f4b7305f834ab3;hp=abf5a2c254bbca14d3f497d566e05c15d6ec510e;hpb=32d0add0a654c1204ab71dc8a55d9374538c4b33;p=deliverable%2Fbinutils-gdb.git diff --git a/gdb/parser-defs.h b/gdb/parser-defs.h index abf5a2c254..e58dc12303 100644 --- a/gdb/parser-defs.h +++ b/gdb/parser-defs.h @@ -1,6 +1,6 @@ /* Parser definitions for GDB. - Copyright (C) 1986-2015 Free Software Foundation, Inc. + Copyright (C) 1986-2021 Free Software Foundation, Inc. Modified from expread.y by the Department of Computer Science at the State University of New York at Buffalo. @@ -23,377 +23,360 @@ #if !defined (PARSER_DEFS_H) #define PARSER_DEFS_H 1 -#include "doublest.h" -#include "vec.h" #include "expression.h" +#include "symtab.h" +#include "expop.h" 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 { - /* The expression related to this parser state. */ - - struct expression *expout; - - /* The size of the expression above. */ - - size_t expout_size; - - /* 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 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 - 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; - -/* The innermost context required by the stack and register variables - we've encountered so far. */ -extern const struct block *innermost_block; - -/* Number of arguments seen so far in innermost function call. */ -extern int arglist_len; - -/* A string token, either a char-string or bit-string. Char-strings are - used, for example, for the names of symbols. */ + /* Constructor. LANG is the language used to parse the expression. + And GDBARCH is the gdbarch to use during parsing. */ -struct stoken + expr_builder (const struct language_defn *lang, + struct gdbarch *gdbarch) + : expout (new expression (lang, gdbarch)) { - /* 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; - }; + DISABLE_COPY_AND_ASSIGN (expr_builder); -struct stoken_vector + /* 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 () { - int len; - struct typed_stoken *tokens; - }; + return std::move (expout); + } -struct ttype - { - struct stoken stoken; - struct type *type; - }; + /* Return the gdbarch that was passed to the constructor. */ -struct symtoken + struct gdbarch *gdbarch () { - struct stoken stoken; - struct symbol *sym; - int is_a_field_of_this; - }; + return expout->gdbarch; + } -struct objc_class_str - { - struct stoken stoken; - struct type *type; - int class; - }; - -typedef struct type *type_ptr; -DEF_VEC_P (type_ptr); + /* Return the language that was passed to the constructor. */ -/* For parsing of complicated types. - An array should be preceded in the list by the size of the array. */ -enum type_pieces + const struct language_defn *language () { - tp_end = -1, - tp_pointer, - tp_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 + return expout->language_defn; + } + + /* Set the root operation of the expression that is currently being + built. */ + void set_operation (expr::operation_up &&op) { - enum type_pieces piece; - int int_val; - struct type_stack *stack_val; - VEC (type_ptr) *typelist_val; - }; + expout->op = std::move (op); + } -/* The type stack is an instance of this structure. */ + /* The expression related to this parser state. */ -struct type_stack -{ - /* Elements on the stack. */ - union type_stack_elt *elements; - /* Current stack depth. */ - int depth; - /* Allocated size of stack. */ - int size; + expression_up expout; }; -/* Helper function to initialize the expout, expout_size, expout_ptr - trio inside PS before it is used to store expression elements created - during the parsing of an expression. 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. */ - -extern void initialize_expout (struct parser_state *ps, - size_t initial_size, - const struct language_defn *lang, - struct gdbarch *gdbarch); - -/* Helper function that reallocates the EXPOUT inside PS in order to - eliminate any unused space. It is generally used when the expression - has just been parsed and created. */ - -extern void reallocate_expout (struct parser_state *ps); - -/* 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 int prefixify_expression (struct expression *expr); +/* This is used for expression completion. */ -extern void write_exp_elt_opcode (struct parser_state *, enum exp_opcode); - -extern void write_exp_elt_sym (struct parser_state *, struct symbol *); +struct expr_completion_state +{ + /* The last struct expression directly before a '.' or '->'. This + is set when parsing and is only used when completing a field + name. It is nullptr if no dereference operation was found. */ + expr::structop_base_operation *expout_last_op = nullptr; -extern void write_exp_elt_longcst (struct parser_state *, LONGEST); + /* If we are completing a tagged type name, this will be nonzero. */ + enum type_code expout_tag_completion_type = TYPE_CODE_UNDEF; -extern void write_exp_elt_dblcst (struct parser_state *, DOUBLEST); + /* The token for tagged type name completion. */ + gdb::unique_xmalloc_ptr expout_completion_name; +}; -extern void write_exp_elt_decfloatcst (struct parser_state *, gdb_byte *); +/* 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. */ -extern void write_exp_elt_type (struct parser_state *, struct type *); +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, + bool completion, + innermost_block_tracker *tracker, + bool void_p) + : 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), + void_context_p (void_p) + { + } -extern void write_exp_elt_intern (struct parser_state *, struct internalvar *); + DISABLE_COPY_AND_ASSIGN (parser_state); -extern void write_exp_string (struct parser_state *, struct stoken); + /* Begin counting arguments for a function call, + saving the data about any containing call. */ -void write_exp_string_vector (struct parser_state *, int type, - struct stoken_vector *vec); + void start_arglist () + { + m_funcall_chain.push_back (arglist_len); + arglist_len = 0; + } -extern void write_exp_bitstring (struct parser_state *, struct stoken); + /* Return the number of arguments in a function call just terminated, + and restore the data for the containing function call. */ -extern void write_exp_elt_block (struct parser_state *, const struct block *); + int end_arglist () + { + int val = arglist_len; + arglist_len = m_funcall_chain.back (); + m_funcall_chain.pop_back (); + return val; + } -extern void write_exp_elt_objfile (struct parser_state *, - struct objfile *objfile); + /* Mark the given operation as the starting location of a structure + expression. This is used when completing on field names. */ -extern void write_exp_msymbol (struct parser_state *, - struct bound_minimal_symbol); + void mark_struct_expression (expr::structop_base_operation *op); -extern void write_dollar_variable (struct parser_state *, struct stoken str); + /* 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. */ -extern void mark_struct_expression (struct parser_state *); + void mark_completion_tag (enum type_code tag, const char *ptr, int length); -extern const char *find_template_name_end (const char *); - -extern void start_arglist (void); + /* Push an operation on the stack. */ + void push (expr::operation_up &&op) + { + m_operations.push_back (std::move (op)); + } -extern int end_arglist (void); + /* Create a new operation and push it on the stack. */ + template + void push_new (Arg... args) + { + m_operations.emplace_back (new T (std::forward (args)...)); + } -extern char *copy_name (struct stoken); + /* Push a new C string operation. */ + void push_c_string (int, struct stoken_vector *vec); -extern void insert_type (enum type_pieces); + /* Push a symbol reference. If SYM is nullptr, look for a minimal + symbol. */ + void push_symbol (const char *name, block_symbol sym); -extern void push_type (enum type_pieces); + /* Push a reference to $mumble. This may result in a convenience + variable, a history reference, or a register. */ + void push_dollar (struct stoken str); -extern void push_type_int (int); + /* Pop an operation from the stack. */ + expr::operation_up pop () + { + expr::operation_up result = std::move (m_operations.back ()); + m_operations.pop_back (); + return result; + } -extern void insert_type_address_space (struct parser_state *, char *); + /* Pop N elements from the stack and return a vector. */ + std::vector pop_vector (int n) + { + std::vector result (n); + for (int i = 1; i <= n; ++i) + result[n - i] = pop (); + return result; + } + + /* A helper that pops an operation, wraps it in some other + operation, and pushes it again. */ + template + void wrap () + { + using namespace expr; + operation_up v = ::expr::make_operation (pop ()); + push (std::move (v)); + } + + /* A helper that pops two operations, wraps them in some other + operation, and pushes the result. */ + template + void wrap2 () + { + expr::operation_up rhs = pop (); + expr::operation_up lhs = pop (); + push (expr::make_operation (std::move (lhs), std::move (rhs))); + } -extern enum type_pieces pop_type (void); + /* If this is nonzero, this block is used as the lexical context for + symbol names. */ -extern int pop_type_int (void); + const struct block * const expression_context_block; -extern struct type_stack *get_type_stack (void); + /* 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; -extern struct type_stack *append_type_stack (struct type_stack *to, - struct type_stack *from); + /* Nonzero means stop parsing on first comma (if not within parentheses). */ -extern void push_type_stack (struct type_stack *stack); + int comma_terminates; -extern void type_stack_cleanup (void *arg); + /* During parsing of a C expression, the pointer to the next character + is in this variable. */ -extern void push_typelist (VEC (type_ptr) *typelist); + const char *lexptr; -extern int length_of_subexp (struct expression *, int); + /* After a token has been recognized, this variable points to it. + Currently used only for error reporting. */ + const char *prev_lexptr = nullptr; -extern int dump_subexp (struct expression *, struct ui_file *, int); + /* Number of arguments seen so far in innermost function call. */ -extern int dump_subexp_body_standard (struct expression *, - struct ui_file *, int); + int arglist_len = 0; -extern void operator_length (const struct expression *, int, int *, int *); + /* True if parsing an expression to attempt completion. */ + bool parse_completion; -extern void operator_length_standard (const struct expression *, int, int *, - int *); + /* Completion state is updated here. */ + expr_completion_state m_completion_state; -extern int operator_check_standard (struct expression *exp, int pos, - int (*objfile_func) - (struct objfile *objfile, void *data), - void *data); + /* The innermost block tracker. */ + innermost_block_tracker *block_tracker; -extern char *op_name_standard (enum exp_opcode); + /* True if no value is expected from the expression. */ + bool void_context_p; -extern struct type *follow_types (struct type *); +private: -extern void null_post_parser (struct expression **, int); + /* Data structure for saving values of arglist_len for function calls whose + arguments contain other function calls. */ -extern int parse_float (const char *p, int len, DOUBLEST *d, - const char **suffix); + std::vector m_funcall_chain; -extern int parse_c_float (struct gdbarch *gdbarch, const char *p, int len, - DOUBLEST *d, struct type **t); + /* Stack of operations. */ + std::vector m_operations; +}; -/* During parsing of a C expression, the pointer to the next character - is in this variable. */ +/* When parsing expressions we track the innermost block that was + referenced. */ -extern const char *lexptr; +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); + } -/* After a token has been recognized, this variable points to it. - Currently used only for error reporting. */ -extern const char *prev_lexptr; + /* 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; + } -/* Current depth in parentheses within the expression. */ +private: + /* The type of innermost block being looked for. */ + innermost_block_tracker_types m_types; -extern int paren_depth; + /* The currently stored innermost block found while parsing an + expression. */ + const struct block *m_innermost_block; +}; -/* Nonzero means stop parsing on first comma (if not within parentheses). */ +/* A string token, either a char-string or bit-string. Char-strings are + used, for example, for the names of symbols. */ -extern int comma_terminates; - -/* These codes indicate operator precedences for expression printing, - least tightly binding first. */ -/* Adding 1 to a precedence value is done for binary operators, - on the operand which is more tightly bound, so that operators - of equal precedence within that operand will get parentheses. */ -/* PREC_HYPER and PREC_ABOVE_COMMA are not the precedence of any operator; - they are used as the "surrounding precedence" to force - various kinds of things to be parenthesized. */ -enum precedence +struct stoken { - 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 + /* 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; }; -/* Table mapping opcodes into strings for printing operators - and precedences of the operators. */ - -struct op_print +struct typed_stoken { - 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; + /* 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; }; -/* Information needed to print, prefixify, and evaluate expressions for - a given language. */ +struct stoken_vector + { + int len; + struct typed_stoken *tokens; + }; -struct exp_descriptor +struct ttype { - /* 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). */ - 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); + struct stoken stoken; + struct type *type; }; +struct symtoken + { + struct stoken stoken; + struct block_symbol sym; + int is_a_field_of_this; + }; -/* Default descriptor containing standard definitions of all - elements. */ -extern const struct exp_descriptor exp_descriptor_standard; +struct objc_class_str + { + struct stoken stoken; + struct type *type; + int theclass; + }; -/* Functions used by language-specific extended operators to (recursively) - print/dump subexpressions. */ +extern const char *find_template_name_end (const char *); -extern void print_subexp (struct expression *, int *, struct ui_file *, - enum precedence); +extern std::string copy_name (struct stoken); -extern void print_subexp_standard (struct expression *, int *, - struct ui_file *, enum precedence); +extern bool parse_float (const char *p, int len, + const struct type *type, gdb_byte *data); + /* 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); - -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); +extern bool exp_uses_objfile (struct expression *exp, struct objfile *objfile); #endif /* PARSER_DEFS_H */