|
|
/* Parser definitions for GDB.
|
|
|
|
|
|
Copyright (C) 1986-2022 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 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"
|
|
|
#include "expop.h"
|
|
|
|
|
|
struct block;
|
|
|
struct language_defn;
|
|
|
struct internalvar;
|
|
|
class innermost_block_tracker;
|
|
|
|
|
|
extern bool parser_debug;
|
|
|
|
|
|
/* A class that can be used to build a "struct expression". */
|
|
|
|
|
|
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)
|
|
|
: expout (new expression (lang, 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 std::move (expout);
|
|
|
}
|
|
|
|
|
|
/* 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;
|
|
|
}
|
|
|
|
|
|
/* Set the root operation of the expression that is currently being
|
|
|
built. */
|
|
|
void set_operation (expr::operation_up &&op)
|
|
|
{
|
|
|
expout->op = std::move (op);
|
|
|
}
|
|
|
|
|
|
/* The expression related to this parser state. */
|
|
|
|
|
|
expression_up expout;
|
|
|
};
|
|
|
|
|
|
/* This is used for expression completion. */
|
|
|
|
|
|
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;
|
|
|
|
|
|
/* 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,
|
|
|
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)
|
|
|
{
|
|
|
}
|
|
|
|
|
|
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. */
|
|
|
|
|
|
int end_arglist ()
|
|
|
{
|
|
|
int val = arglist_len;
|
|
|
arglist_len = m_funcall_chain.back ();
|
|
|
m_funcall_chain.pop_back ();
|
|
|
return val;
|
|
|
}
|
|
|
|
|
|
/* Mark the given operation as the starting location of a structure
|
|
|
expression. This is used when completing on field names. */
|
|
|
|
|
|
void mark_struct_expression (expr::structop_base_operation *op);
|
|
|
|
|
|
/* 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);
|
|
|
|
|
|
/* Push an operation on the stack. */
|
|
|
void push (expr::operation_up &&op)
|
|
|
{
|
|
|
m_operations.push_back (std::move (op));
|
|
|
}
|
|
|
|
|
|
/* Create a new operation and push it on the stack. */
|
|
|
template<typename T, typename... Arg>
|
|
|
void push_new (Arg... args)
|
|
|
{
|
|
|
m_operations.emplace_back (new T (std::forward<Arg> (args)...));
|
|
|
}
|
|
|
|
|
|
/* Push a new C string operation. */
|
|
|
void push_c_string (int, struct stoken_vector *vec);
|
|
|
|
|
|
/* Push a symbol reference. If SYM is nullptr, look for a minimal
|
|
|
symbol. */
|
|
|
void push_symbol (const char *name, block_symbol sym);
|
|
|
|
|
|
/* Push a reference to $mumble. This may result in a convenience
|
|
|
variable, a history reference, or a register. */
|
|
|
void push_dollar (struct stoken str);
|
|
|
|
|
|
/* 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;
|
|
|
}
|
|
|
|
|
|
/* Pop N elements from the stack and return a vector. */
|
|
|
std::vector<expr::operation_up> pop_vector (int n)
|
|
|
{
|
|
|
std::vector<expr::operation_up> 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<typename T>
|
|
|
void wrap ()
|
|
|
{
|
|
|
using namespace expr;
|
|
|
operation_up v = ::expr::make_operation<T> (pop ());
|
|
|
push (std::move (v));
|
|
|
}
|
|
|
|
|
|
/* A helper that pops two operations, wraps them in some other
|
|
|
operation, and pushes the result. */
|
|
|
template<typename T>
|
|
|
void wrap2 ()
|
|
|
{
|
|
|
expr::operation_up rhs = pop ();
|
|
|
expr::operation_up lhs = pop ();
|
|
|
push (expr::make_operation<T> (std::move (lhs), std::move (rhs)));
|
|
|
}
|
|
|
|
|
|
/* 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. */
|
|
|
|
|
|
const char *lexptr;
|
|
|
|
|
|
/* 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. */
|
|
|
bool parse_completion;
|
|
|
|
|
|
/* Completion state is updated here. */
|
|
|
expr_completion_state m_completion_state;
|
|
|
|
|
|
/* The innermost block tracker. */
|
|
|
innermost_block_tracker *block_tracker;
|
|
|
|
|
|
/* True if no value is expected from the expression. */
|
|
|
bool void_context_p;
|
|
|
|
|
|
private:
|
|
|
|
|
|
/* Data structure for saving values of arglist_len for function calls whose
|
|
|
arguments contain other function calls. */
|
|
|
|
|
|
std::vector<int> m_funcall_chain;
|
|
|
|
|
|
/* Stack of operations. */
|
|
|
std::vector<expr::operation_up> m_operations;
|
|
|
};
|
|
|
|
|
|
/* 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;
|
|
|
struct type *type;
|
|
|
};
|
|
|
|
|
|
struct symtoken
|
|
|
{
|
|
|
struct stoken stoken;
|
|
|
struct block_symbol sym;
|
|
|
int is_a_field_of_this;
|
|
|
};
|
|
|
|
|
|
struct objc_class_str
|
|
|
{
|
|
|
struct stoken stoken;
|
|
|
struct type *type;
|
|
|
int theclass;
|
|
|
};
|
|
|
|
|
|
extern const char *find_template_name_end (const char *);
|
|
|
|
|
|
extern std::string copy_name (struct stoken);
|
|
|
|
|
|
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 bool exp_uses_objfile (struct expression *exp, struct objfile *objfile);
|
|
|
|
|
|
#endif /* PARSER_DEFS_H */
|
|
|
|