compile-internal.h

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/* Header file for GDB compile command and supporting functions.
   Copyright (C) 2014-2018 Free Software Foundation, Inc.

   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/>.  */

#ifndef GDB_COMPILE_INTERNAL_H
#define GDB_COMPILE_INTERNAL_H

#include "hashtab.h"
#include "gcc-c-interface.h"
#include "common/enum-flags.h"

/* enum-flags wrapper.  */
DEF_ENUM_FLAGS_TYPE (enum gcc_qualifiers, gcc_qualifiers_flags);

/* Debugging flag for the "compile" family of commands.  */

extern int compile_debug;

struct block;

/* An object of this type holds state associated with a given
   compilation job.  */

struct compile_instance
{
  /* The GCC front end.  */

  struct gcc_base_context *fe;

  /* The "scope" of this compilation.  */

  enum compile_i_scope_types scope;

  /* The block in which an expression is being parsed.  */

  const struct block *block;

  /* Specify "-std=gnu11", "-std=gnu++11" or similar.  These options are put
     after CU's DW_AT_producer compilation options to override them.  */

  const char *gcc_target_options;

  /* How to destroy this object.  */

  void (*destroy) (struct compile_instance *);
};

/* A subclass of compile_instance that is specific to the C front
   end.  */
struct compile_c_instance
{
  /* Base class.  Note that the base class vtable actually points to a
     gcc_c_fe_vtable.  */

  struct compile_instance base;

  /* Map from gdb types to gcc types.  */

  htab_t type_map;

  /* Map from gdb symbols to gcc error messages to emit.  */

  htab_t symbol_err_map;
};

/* A helper macro that takes a compile_c_instance and returns its
   corresponding gcc_c_context.  */

#define C_CTX(I) ((struct gcc_c_context *) ((I)->base.fe))

/* Define header and footers for different scopes.  */

/* A simple scope just declares a function named "_gdb_expr", takes no
   arguments and returns no value.  */

#define COMPILE_I_SIMPLE_REGISTER_STRUCT_TAG "__gdb_regs"
#define COMPILE_I_SIMPLE_REGISTER_ARG_NAME "__regs"
#define COMPILE_I_SIMPLE_REGISTER_DUMMY "_dummy"
#define COMPILE_I_PRINT_OUT_ARG_TYPE "void *"
#define COMPILE_I_PRINT_OUT_ARG "__gdb_out_param"
#define COMPILE_I_EXPR_VAL "__gdb_expr_val"
#define COMPILE_I_EXPR_PTR_TYPE "__gdb_expr_ptr_type"

/* Call gdbarch_register_name (GDBARCH, REGNUM) and convert its result
   to a form suitable for the compiler source.  The register names
   should not clash with inferior defined macros. */

extern std::string compile_register_name_mangled (struct gdbarch *gdbarch,
                          int regnum);

/* Convert compiler source register name to register number of
   GDBARCH.  Returned value is always >= 0, function throws an error
   for non-matching REG_NAME.  */

extern int compile_register_name_demangle (struct gdbarch *gdbarch,
                       const char *reg_name);

/* Convert a gdb type, TYPE, to a GCC type.  CONTEXT is used to do the
   actual conversion.  The new GCC type is returned.  */

struct type;
extern gcc_type convert_type (struct compile_c_instance *context,
                  struct type *type);

/* A callback suitable for use as the GCC C symbol oracle.  */

extern gcc_c_oracle_function gcc_convert_symbol;

/* A callback suitable for use as the GCC C address oracle.  */

extern gcc_c_symbol_address_function gcc_symbol_address;

/* Instantiate a GDB object holding state for the GCC context FE.  The
   new object is returned.  */

extern struct compile_instance *new_compile_instance (struct gcc_c_context *fe);

/* Emit code to compute the address for all the local variables in
   scope at PC in BLOCK.  Returns a malloc'd vector, indexed by gdb
   register number, where each element indicates if the corresponding
   register is needed to compute a local variable.  */

extern unsigned char *generate_c_for_variable_locations
     (struct compile_c_instance *compiler,
      string_file &stream,
      struct gdbarch *gdbarch,
      const struct block *block,
      CORE_ADDR pc);

/* Get the GCC mode attribute value for a given type size.  */

extern const char *c_get_mode_for_size (int size);

/* Given a dynamic property, return a name that is used to represent
   its size.  The contents of the resulting string will be the same
   each time for each call with the same argument.  */

struct dynamic_prop;
extern std::string c_get_range_decl_name (const struct dynamic_prop *prop);

/* Type used to hold and pass around the source and object file names
   to use for compilation.  */
class compile_file_names
{
public:
  compile_file_names (std::string source_file, std::string object_file)
    : m_source_file (source_file), m_object_file (object_file)
  {}

  /* Provide read-only views only.  Return 'const char *' instead of
     std::string to avoid having to use c_str() everywhere in client
     code.  */

  const char *source_file () const
  { return m_source_file.c_str (); }

  const char *object_file () const
  { return m_object_file.c_str (); }

private:
  /* Storage for the file names.  */
  std::string m_source_file;
  std::string m_object_file;
};

#endif /* GDB_COMPILE_INTERNAL_H */