gdb/gdbarch.py

#!/usr/bin/env python3

# Architecture commands for GDB, the GNU debugger.
#
# Copyright (C) 1998-2024 Free Software Foundation, Inc.
#
# 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/>.

import textwrap

# gdbarch_components is imported only for its side-effect of filling
# `gdbarch_types.components`.
import gdbarch_components  # noqa: F401 # type: ignore
import gdbcopyright
from gdbarch_types import Component, Function, Info, Value, components


def indentation(n_columns: int):
    """Return string with tabs and spaces to indent line to N_COLUMNS."""
    return "\t" * (n_columns // 8) + " " * (n_columns % 8)


copyright = gdbcopyright.copyright(
    "gdbarch.py", "Dynamic architecture support for GDB, the GNU debugger."
)


def info(c: Component):
    "Filter function to only allow Info components."
    return type(c) is Info


def not_info(c: Component):
    "Filter function to omit Info components."
    return type(c) is not Info


with open("gdbarch-gen.h", "w") as f:
    print(copyright, file=f)
    print(file=f)
    print(file=f)
    print(file=f)
    print("/* The following are pre-initialized by GDBARCH.  */", file=f)

    # Do Info components first.
    for c in filter(info, components):
        print(file=f)
        print(
            f"""extern {c.type} gdbarch_{c.name} (struct gdbarch *gdbarch);
/* set_gdbarch_{c.name}() - not applicable - pre-initialized.  */""",
            file=f,
        )

    print(file=f)
    print(file=f)
    print("/* The following are initialized by the target dependent code.  */", file=f)

    # Generate decls for accessors, setters, and predicates for all
    # non-Info components.
    for c in filter(not_info, components):
        if c.comment:
            print(file=f)
            comment = c.comment.split("\n")
            if comment[0] == "":
                comment = comment[1:]
            if comment[-1] == "":
                comment = comment[:-1]
            print("/* ", file=f, end="")
            print(comment[0], file=f, end="")
            if len(comment) > 1:
                print(file=f)
                print(
                    textwrap.indent("\n".join(comment[1:]), prefix="   "),
                    end="",
                    file=f,
                )
            print(" */", file=f)

        if c.predicate:
            print(file=f)
            print(f"extern bool gdbarch_{c.name}_p (struct gdbarch *gdbarch);", file=f)

        print(file=f)
        if isinstance(c, Value):
            print(
                f"extern {c.type} gdbarch_{c.name} (struct gdbarch *gdbarch);",
                file=f,
            )
            print(
                f"extern void set_gdbarch_{c.name} (struct gdbarch *gdbarch, {c.type} {c.name});",
                file=f,
            )
        else:
            assert isinstance(c, Function)
            print(
                f"typedef {c.type} ({c.ftype()}) ({c.param_list()});",
                file=f,
            )
            if c.implement:
                print(
                    f"extern {c.type} gdbarch_{c.name} ({c.set_list()});",
                    file=f,
                )
            print(
                f"extern void set_gdbarch_{c.name} (struct gdbarch *gdbarch, {c.ftype()} *{c.name});",
                file=f,
            )

with open("gdbarch-gen.c", "w") as f:
    print(copyright, file=f)
    print(file=f)
    print(file=f)
    print("/* Maintain the struct gdbarch object.  */", file=f)
    print(file=f)
    #
    # The struct definition body.
    #
    print("struct gdbarch", file=f)
    print("{", file=f)
    print("  /* Has this architecture been fully initialized?  */", file=f)
    print("  bool initialized_p = false;", file=f)
    print(file=f)
    print("  /* An obstack bound to the lifetime of the architecture.  */", file=f)
    print("  auto_obstack obstack;", file=f)
    print("  /* Registry.  */", file=f)
    print("  registry<gdbarch> registry_fields;", file=f)
    print(file=f)
    print("  /* basic architectural information.  */", file=f)
    for c in filter(info, components):
        print(f"  {c.type} {c.name};", file=f)
    print(file=f)
    print("  /* target specific vector.  */", file=f)
    print("  gdbarch_tdep_up tdep;", file=f)
    print("  gdbarch_dump_tdep_ftype *dump_tdep = nullptr;", file=f)
    print(file=f)
    for c in filter(not_info, components):
        if isinstance(c, Function):
            print(f"  gdbarch_{c.name}_ftype *", file=f, end="")
        else:
            print(f"  {c.type} ", file=f, end="")
        print(f"{c.name} = ", file=f, end="")
        if c.predefault is not None:
            print(f"{c.predefault};", file=f)
        elif isinstance(c, Value):
            print("0;", file=f)
        else:
            assert isinstance(c, Function)
            print("nullptr;", file=f)
    print("};", file=f)
    print(file=f)
    #
    # Initialization.
    #
    print("/* Create a new ``struct gdbarch'' based on information provided by", file=f)
    print("   ``struct gdbarch_info''.  */", file=f)
    print(file=f)
    print("struct gdbarch *", file=f)
    print("gdbarch_alloc (const struct gdbarch_info *info,", file=f)
    print("	       gdbarch_tdep_up tdep)", file=f)
    print("{", file=f)
    print("  struct gdbarch *gdbarch;", file=f)
    print("", file=f)
    print("  gdbarch = new struct gdbarch;", file=f)
    print(file=f)
    print("  gdbarch->tdep = std::move (tdep);", file=f)
    print(file=f)
    for c in filter(info, components):
        print(f"  gdbarch->{c.name} = info->{c.name};", file=f)
    print(file=f)
    print("  return gdbarch;", file=f)
    print("}", file=f)
    print(file=f)
    print(file=f)
    print(file=f)
    #
    # Post-initialization validation and updating
    #
    print("/* Ensure that all values in a GDBARCH are reasonable.  */", file=f)
    print(file=f)
    print("static void", file=f)
    print("verify_gdbarch (struct gdbarch *gdbarch)", file=f)
    print("{", file=f)
    print("  string_file log;", file=f)
    print(file=f)
    print("  /* fundamental */", file=f)
    print("  if (gdbarch->byte_order == BFD_ENDIAN_UNKNOWN)", file=f)
    print("""    log.puts ("\\n\\tbyte-order");""", file=f)
    print("  if (gdbarch->bfd_arch_info == NULL)", file=f)
    print("""    log.puts ("\\n\\tbfd_arch_info");""", file=f)
    print(
        "  /* Check those that need to be defined for the given multi-arch level.  */",
        file=f,
    )
    for c in filter(not_info, components):
        # An opportunity to write in the 'postdefault' value.  We
        # change field's value to the postdefault if its current value
        # is not different to the initial value of the field.
        if c.postdefault is not None:
            init_value = c.predefault or "0"
            print(f"  if (gdbarch->{c.name} == {init_value})", file=f)
            print(f"    gdbarch->{c.name} = {c.postdefault};", file=f)

        # Now validate the value.
        if isinstance(c.invalid, str):
            print(f"  if ({c.invalid})", file=f)
            print(f"""    log.puts ("\\n\\t{c.name}");""", file=f)
        elif c.predicate:
            print(f"  /* Skip verify of {c.name}, has predicate.  */", file=f)
        elif c.invalid:
            if c.postdefault is not None:
                # This component has its 'invalid' field set to True, but
                # also has a postdefault.  This makes no sense, the
                # postdefault will have been applied above, so this field
                # will not have a zero value.
                raise Exception(
                    f"component {c.name} has postdefault and invalid set to True"
                )
            else:
                init_value = c.predefault or "0"
                print(f"  if (gdbarch->{c.name} == {init_value})", file=f)
                print(f"""    log.puts ("\\n\\t{c.name}");""", file=f)
        else:
            print(f"  /* Skip verify of {c.name}, invalid_p == 0.  */", file=f)
    print("  if (!log.empty ())", file=f)
    print(
        """    internal_error (_("verify_gdbarch: the following are invalid ...%s"),""",
        file=f,
    )
    print("		    log.c_str ());", file=f)
    print("}", file=f)
    print(file=f)
    print(file=f)
    #
    # Dumping.
    #
    print("/* Print out the details of the current architecture.  */", file=f)
    print(file=f)
    print("void", file=f)
    print("gdbarch_dump (struct gdbarch *gdbarch, struct ui_file *file)", file=f)
    print("{", file=f)
    print("""  const char *gdb_nm_file = "<not-defined>";""", file=f)
    print(file=f)
    print("#if defined (GDB_NM_FILE)", file=f)
    print("  gdb_nm_file = GDB_NM_FILE;", file=f)
    print("#endif", file=f)
    print("  gdb_printf (file,", file=f)
    print("""	      "gdbarch_dump: GDB_NM_FILE = %s\\n",""", file=f)
    print("	      gdb_nm_file);", file=f)
    for c in components:
        if c.predicate:
            print("  gdb_printf (file,", file=f)
            print(
                f"""	      "gdbarch_dump: gdbarch_{c.name}_p() = %d\\n",""",
                file=f,
            )
            print(f"	      gdbarch_{c.name}_p (gdbarch));", file=f)
        if isinstance(c, Function):
            print("  gdb_printf (file,", file=f)
            print(f"""	      "gdbarch_dump: {c.name} = <%s>\\n",""", file=f)
            print(
                f"	      host_address_to_string (gdbarch->{c.name}));",
                file=f,
            )
        else:
            if c.printer:
                printer = c.printer
            elif c.type == "CORE_ADDR":
                printer = f"core_addr_to_string_nz (gdbarch->{c.name})"
            else:
                printer = f"plongest (gdbarch->{c.name})"
            print("  gdb_printf (file,", file=f)
            print(f"""	      "gdbarch_dump: {c.name} = %s\\n",""", file=f)
            print(f"	      {printer});", file=f)
    print("  if (gdbarch->dump_tdep != NULL)", file=f)
    print("    gdbarch->dump_tdep (gdbarch, file);", file=f)
    print("}", file=f)
    print(file=f)
    #
    # Bodies of setter, accessor, and predicate functions.
    #
    for c in components:
        if c.predicate:
            print(file=f)
            print("bool", file=f)
            print(f"gdbarch_{c.name}_p (struct gdbarch *gdbarch)", file=f)
            print("{", file=f)
            print("  gdb_assert (gdbarch != NULL);", file=f)
            print(f"  return {c.get_predicate()};", file=f)
            print("}", file=f)
        if isinstance(c, Function):
            if c.implement:
                print(file=f)
                print(f"{c.type}", file=f)
                print(f"gdbarch_{c.name} ({c.set_list()})", file=f)
                print("{", file=f)
                print("  gdb_assert (gdbarch != NULL);", file=f)
                print(f"  gdb_assert (gdbarch->{c.name} != NULL);", file=f)
                if c.predicate and c.predefault:
                    # Allow a call to a function with a predicate.
                    print(
                        f"  /* Do not check predicate: {c.get_predicate()}, allow call.  */",
                        file=f,
                    )
                if c.param_checks:
                    for rule in c.param_checks:
                        print(f"  gdb_assert ({rule});", file=f)
                print("  if (gdbarch_debug >= 2)", file=f)
                print(
                    f"""    gdb_printf (gdb_stdlog, "gdbarch_{c.name} called\\n");""",
                    file=f,
                )
                print("  ", file=f, end="")
                if c.type != "void":
                    if c.result_checks:
                        print("auto result = ", file=f, end="")
                    else:
                        print("return ", file=f, end="")
                print(f"gdbarch->{c.name} ({c.actuals()});", file=f)
                if c.type != "void" and c.result_checks:
                    for rule in c.result_checks:
                        print(f"  gdb_assert ({rule});", file=f)
                    print("  return result;", file=f)
                print("}", file=f)
            print(file=f)
            print("void", file=f)
            setter_name = f"set_gdbarch_{c.name}"
            ftype_name = f"gdbarch_{c.name}_ftype"
            print(f"{setter_name} (struct gdbarch *gdbarch,", file=f)
            indent_columns = len(f"{setter_name} (")
            print(f"{indentation(indent_columns)}{ftype_name} {c.name})", file=f)
            print("{", file=f)
            print(f"  gdbarch->{c.name} = {c.name};", file=f)
            print("}", file=f)
        elif isinstance(c, Value):
            print(file=f)
            print(f"{c.type}", file=f)
            print(f"gdbarch_{c.name} (struct gdbarch *gdbarch)", file=f)
            print("{", file=f)
            print("  gdb_assert (gdbarch != NULL);", file=f)
            if isinstance(c.invalid, str):
                print("  /* Check variable is valid.  */", file=f)
                print(f"  gdb_assert (!({c.invalid}));", file=f)
            elif c.predicate:
                print("  /* Check predicate was used.  */", file=f)
                print(f"  gdb_assert (gdbarch_{c.name}_p (gdbarch));", file=f)
            elif c.invalid or c.postdefault is not None:
                init_value = c.predefault or "0"
                print("  /* Check variable changed from its initial value.  */", file=f)
                print(f"  gdb_assert (gdbarch->{c.name} != {init_value});", file=f)
            else:
                print(f"  /* Skip verify of {c.name}, invalid_p == 0.  */", file=f)
            print("  if (gdbarch_debug >= 2)", file=f)
            print(
                f"""    gdb_printf (gdb_stdlog, "gdbarch_{c.name} called\\n");""",
                file=f,
            )
            print(f"  return gdbarch->{c.name};", file=f)
            print("}", file=f)
            print(file=f)
            print("void", file=f)
            setter_name = f"set_gdbarch_{c.name}"
            print(f"{setter_name} (struct gdbarch *gdbarch,", file=f)
            indent_columns = len(f"{setter_name} (")
            print(f"{indentation(indent_columns)}{c.type} {c.name})", file=f)
            print("{", file=f)
            print(f"  gdbarch->{c.name} = {c.name};", file=f)
            print("}", file=f)
        else:
            assert isinstance(c, Info)
            print(file=f)
            print(f"{c.type}", file=f)
            print(f"gdbarch_{c.name} (struct gdbarch *gdbarch)", file=f)
            print("{", file=f)
            print("  gdb_assert (gdbarch != NULL);", file=f)
            print("  if (gdbarch_debug >= 2)", file=f)
            print(
                f"""    gdb_printf (gdb_stdlog, "gdbarch_{c.name} called\\n");""",
                file=f,
            )
            print(f"  return gdbarch->{c.name};", file=f)
            print("}", file=f)