mirror of
https://github.com/gcc-mirror/gcc.git
synced 2024-11-21 13:40:47 +00:00
bc0e18a960
PR libcc1/113977 points out a case where a simple expression is rejected with a compiler error message. The bug here is that gdb does not inform the plugin of the correct alignment -- in fact, there is no way to do that. This patch adds a new method to allow the alignment to be set, and bumps the C front end protocol version. It also includes some updates to various comments in 'include', done here to simplify the merge to binutils-gdb. include * gcc-cp-interface.h (gcc_cp_fe_context_function): Update comment. * gcc-c-interface.h (enum gcc_c_api_version) <GCC_C_FE_VERSION_2>: New constant. (gcc_c_fe_context_function): Update comment. * gcc-c-fe.def (finish_record_with_alignment): New method. Update documentation. libcc1 PR libcc1/113977 * libcc1plugin.cc (plugin_finish_record_or_union): New function. (plugin_finish_record_or_union): Rewrite. (plugin_init): Use GCC_C_FE_VERSION_2. * libcc1.cc (c_vtable): Use GCC_C_FE_VERSION_2. (gcc_c_fe_context): Check for GCC_C_FE_VERSION_2.
501 lines
15 KiB
C++
501 lines
15 KiB
C++
/* Interface between GCC C++ FE and GDB
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Copyright (C) 2014-2024 Free Software Foundation, Inc.
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This file is part of GCC.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#ifndef GCC_CP_INTERFACE_H
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#define GCC_CP_INTERFACE_H
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#include "gcc-interface.h"
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/* This header defines the interface to the GCC API. It must be both
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valid C and valid C++, because it is included by both programs. */
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* Forward declaration. */
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struct gcc_cp_context;
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/*
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* Definitions and declarations for the C++ front end.
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*/
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/* Defined versions of the C++ front-end API. */
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enum gcc_cp_api_version
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{
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GCC_CP_FE_VERSION_0 = 0
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};
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/* Qualifiers. */
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enum gcc_cp_qualifiers
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{
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GCC_CP_QUALIFIER_CONST = 1,
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GCC_CP_QUALIFIER_VOLATILE = 2,
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GCC_CP_QUALIFIER_RESTRICT = 4
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};
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/* Ref qualifiers. */
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enum gcc_cp_ref_qualifiers {
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GCC_CP_REF_QUAL_NONE = 0,
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GCC_CP_REF_QUAL_LVALUE = 1,
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GCC_CP_REF_QUAL_RVALUE = 2
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};
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/* Opaque typedef for unbound class templates. They are used for
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template arguments, and defaults for template template
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parameters. */
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typedef unsigned long long gcc_utempl;
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/* Opaque typedef for expressions. They are used for template
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arguments, defaults for non-type template parameters, and defaults
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for function arguments. */
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typedef unsigned long long gcc_expr;
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typedef enum
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{ GCC_CP_TPARG_VALUE, GCC_CP_TPARG_CLASS,
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GCC_CP_TPARG_TEMPL, GCC_CP_TPARG_PACK }
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gcc_cp_template_arg_kind;
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typedef union
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{ gcc_expr value; gcc_type type; gcc_utempl templ; gcc_type pack; }
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gcc_cp_template_arg;
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/* An array of template arguments. */
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struct gcc_cp_template_args
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{
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/* Number of elements. */
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int n_elements;
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/* kind[i] indicates what kind of template argument type[i] is. */
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char /* gcc_cp_template_arg_kind */ *kinds;
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/* The template arguments. */
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gcc_cp_template_arg *elements;
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};
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/* An array of (default) function arguments. */
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struct gcc_cp_function_args
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{
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/* Number of elements. */
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int n_elements;
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/* The (default) values for each argument. */
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gcc_expr *elements;
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};
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/* This enumerates the kinds of decls that GDB can create. */
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enum gcc_cp_symbol_kind
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{
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/* A function. */
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GCC_CP_SYMBOL_FUNCTION,
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/* A variable. */
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GCC_CP_SYMBOL_VARIABLE,
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/* A typedef, or an alias declaration (including template ones). */
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GCC_CP_SYMBOL_TYPEDEF,
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/* A label. */
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GCC_CP_SYMBOL_LABEL,
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/* A class, forward declared in build_decl (to be later defined in
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start_class_definition), or, in a template parameter list scope,
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a declaration of a template class, closing the parameter
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list. */
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GCC_CP_SYMBOL_CLASS,
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/* A union, forward declared in build_decl (to be later defined in
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start_class_definition). */
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GCC_CP_SYMBOL_UNION,
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/* An enumeration type being introduced with start_new_enum_type. */
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GCC_CP_SYMBOL_ENUM,
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/* A nonstatic data member being introduced with new_field. */
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GCC_CP_SYMBOL_FIELD,
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/* A base class in a gcc_vbase_array. */
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GCC_CP_SYMBOL_BASECLASS,
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/* A using declaration in new_using_decl. */
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GCC_CP_SYMBOL_USING,
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/* A (lambda) closure class type. In many regards this is just like
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a regular class, but it's not supposed to have base classes, some
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of the member functions that are usually implicitly-defined are
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deleted, and it should have an operator() member function that
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holds the lambda body. We can't instantiate objects of lambda
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types from the snippet, but we can interact with them in such
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ways as passing them to functions that take their types, and
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calling their body. */
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GCC_CP_SYMBOL_LAMBDA_CLOSURE,
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/* Marker to check that we haven't exceeded GCC_CP_SYMBOL_MASK. */
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GCC_CP_SYMBOL_END,
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GCC_CP_SYMBOL_MASK = 15,
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/* When defining a class member, at least one of the
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GCC_CP_ACCESS_MASK bits must be set; when defining a namespace-
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or union-scoped symbol, none of them must be set. */
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GCC_CP_ACCESS_PRIVATE,
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GCC_CP_ACCESS_PUBLIC = GCC_CP_ACCESS_PRIVATE << 1,
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GCC_CP_ACCESS_MASK = (GCC_CP_ACCESS_PUBLIC
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| GCC_CP_ACCESS_PRIVATE),
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GCC_CP_ACCESS_PROTECTED = GCC_CP_ACCESS_MASK,
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GCC_CP_ACCESS_NONE = 0,
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GCC_CP_FLAG_BASE = GCC_CP_ACCESS_PRIVATE << 2,
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/* Flags to be used along with GCC_CP_SYMBOL_FUNCTION: */
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/* This flag should be set for constructors, destructors and
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operators. */
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GCC_CP_FLAG_SPECIAL_FUNCTION = GCC_CP_FLAG_BASE,
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/* We intentionally cannot express inline, constexpr, or virtual
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override for functions. We can't inline or constexpr-replace
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without a source-level body. The override keyword is only
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meaningful within the definition of the containing class. */
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/* This indicates a "virtual" member function, explicitly or
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implicitly (due to a virtual function with the same name and
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prototype in a base class) declared as such. */
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GCC_CP_FLAG_VIRTUAL_FUNCTION = GCC_CP_FLAG_BASE << 1,
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/* The following two flags should only be set when the flag above is
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set. */
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/* This indicates a pure virtual member function, i.e., one that is
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declared with "= 0", even if a body is provided in the
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definition. */
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GCC_CP_FLAG_PURE_VIRTUAL_FUNCTION = GCC_CP_FLAG_BASE << 2,
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/* This indicates a "final" virtual member function. */
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GCC_CP_FLAG_FINAL_VIRTUAL_FUNCTION = GCC_CP_FLAG_BASE << 3,
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/* This indicates a special member function should have its default
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implementation. This either means the function declaration
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contains the "= default" tokens, or that the member function was
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implicitly generated by the compiler, although the latter use is
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discouraged: just let the compiler implicitly introduce it.
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A member function defaulted after its first declaration has
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slightly different ABI implications from one implicitly generated
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or explicitly defaulted at the declaration (and definition)
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point. To avoid silent (possibly harmless) violation of the one
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definition rule, it is recommended that this flag not be used for
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such functions, and that the address of the definition be
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supplied instead. */
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GCC_CP_FLAG_DEFAULTED_FUNCTION = GCC_CP_FLAG_BASE << 4,
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/* This indicates a deleted member function, i.e., one that has been
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defined as "= delete" at its declaration point, or one that has
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been implicitly defined as deleted (with or without an explicit
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"= default" definition).
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This should not be used for implicitly-declared member functions
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that resolve to deleted definitions, as it may affect the
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implicit declaration of other member functions. */
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GCC_CP_FLAG_DELETED_FUNCTION = GCC_CP_FLAG_BASE << 5,
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/* This indicates a constructor or type-conversion operator declared
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as "explicit". */
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GCC_CP_FLAG_EXPLICIT_FUNCTION = GCC_CP_FLAG_BASE << 6,
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GCC_CP_FLAG_END_FUNCTION,
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GCC_CP_FLAG_MASK_FUNCTION = (((GCC_CP_FLAG_END_FUNCTION - 1) << 1)
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- GCC_CP_FLAG_BASE),
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/* Flags to be used along with GCC_CP_SYMBOL_VARIABLE: */
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/* This indicates a variable declared as "constexpr". */
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GCC_CP_FLAG_CONSTEXPR_VARIABLE = GCC_CP_FLAG_BASE,
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/* This indicates a variable declared as "thread_local". ??? What
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should the ADDRESS be? */
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GCC_CP_FLAG_THREAD_LOCAL_VARIABLE = GCC_CP_FLAG_BASE << 1,
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GCC_CP_FLAG_END_VARIABLE,
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GCC_CP_FLAG_MASK_VARIABLE = (((GCC_CP_FLAG_END_VARIABLE - 1) << 1)
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- GCC_CP_FLAG_BASE),
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/* Flags to be used when defining nonstatic data members of classes
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with new_field. */
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/* Use this when no flags are present. */
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GCC_CP_FLAG_FIELD_NOFLAG = 0,
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/* This indicates the field is declared as mutable. */
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GCC_CP_FLAG_FIELD_MUTABLE = GCC_CP_FLAG_BASE,
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GCC_CP_FLAG_END_FIELD,
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GCC_CP_FLAG_MASK_FIELD = (((GCC_CP_FLAG_END_FIELD - 1) << 1)
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- GCC_CP_FLAG_BASE),
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/* Flags to be used when defining an enum with
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start_new_enum_type. */
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/* This indicates an enum type without any flags. */
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GCC_CP_FLAG_ENUM_NOFLAG = 0,
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/* This indicates a scoped enum type. */
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GCC_CP_FLAG_ENUM_SCOPED = GCC_CP_FLAG_BASE,
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GCC_CP_FLAG_END_ENUM,
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GCC_CP_FLAG_MASK_ENUM = (((GCC_CP_FLAG_END_ENUM - 1) << 1)
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- GCC_CP_FLAG_BASE),
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/* Flags to be used when introducing a class or a class template
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with build_decl. */
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/* This indicates an enum type without any flags. */
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GCC_CP_FLAG_CLASS_NOFLAG = 0,
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/* This indicates the class is actually a struct. This has no
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effect whatsoever on access control in this interface, since all
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class members must have explicit access control bits set, but it
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may affect error messages. */
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GCC_CP_FLAG_CLASS_IS_STRUCT = GCC_CP_FLAG_BASE,
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GCC_CP_FLAG_END_CLASS,
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GCC_CP_FLAG_MASK_CLASS = (((GCC_CP_FLAG_END_CLASS - 1) << 1)
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- GCC_CP_FLAG_BASE),
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/* Flags to be used when introducing a virtual base class in a
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gcc_vbase_array. */
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/* This indicates an enum type without any flags. */
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GCC_CP_FLAG_BASECLASS_NOFLAG = 0,
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/* This indicates the class is actually a struct. This has no
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effect whatsoever on access control in this interface, since all
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class members must have explicit access control bits set, but it
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may affect error messages. */
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GCC_CP_FLAG_BASECLASS_VIRTUAL = GCC_CP_FLAG_BASE,
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GCC_CP_FLAG_END_BASECLASS,
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GCC_CP_FLAG_MASK_BASECLASS = (((GCC_CP_FLAG_END_BASECLASS - 1) << 1)
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- GCC_CP_FLAG_BASE),
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GCC_CP_FLAG_MASK = (GCC_CP_FLAG_MASK_FUNCTION
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| GCC_CP_FLAG_MASK_VARIABLE
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| GCC_CP_FLAG_MASK_FIELD
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| GCC_CP_FLAG_MASK_ENUM
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| GCC_CP_FLAG_MASK_CLASS
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| GCC_CP_FLAG_MASK_BASECLASS
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)
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};
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/* An array of types used for creating lists of base classes. */
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struct gcc_vbase_array
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{
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/* Number of elements. */
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int n_elements;
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/* The base classes. */
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gcc_type *elements;
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/* Flags for each base class. Used to indicate access control and
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virtualness. */
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enum gcc_cp_symbol_kind *flags;
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};
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/* This enumerates the types of symbols that GCC might request from
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GDB. */
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enum gcc_cp_oracle_request
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{
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/* An identifier in namespace scope -- type, variable, function,
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namespace, template. All namespace-scoped symbols with the
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requested name, in any namespace (including the global
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namespace), should be defined in response to this request. */
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GCC_CP_ORACLE_IDENTIFIER
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};
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/* The type of the function called by GCC to ask GDB for a symbol's
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definition. DATUM is an arbitrary value supplied when the oracle
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function is registered. CONTEXT is the GCC context in which the
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request is being made. REQUEST specifies what sort of symbol is
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being requested, and IDENTIFIER is the name of the symbol. */
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typedef void gcc_cp_oracle_function (void *datum,
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struct gcc_cp_context *context,
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enum gcc_cp_oracle_request request,
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const char *identifier);
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/* The type of the function called by GCC to ask GDB for a symbol's
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address. This should return 0 if the address is not known. */
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typedef gcc_address gcc_cp_symbol_address_function (void *datum,
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struct gcc_cp_context *ctxt,
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const char *identifier);
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/* The type of the function called by GCC to ask GDB to enter or leave
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the user expression scope. */
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typedef void gcc_cp_enter_leave_user_expr_scope_function (void *datum,
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struct gcc_cp_context
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*context);
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/* The vtable used by the C front end. */
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struct gcc_cp_fe_vtable
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{
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/* The version of the C interface. The value is one of the
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gcc_cp_api_version constants. */
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unsigned int cp_version;
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/* Set the callbacks for this context.
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The binding oracle is called whenever the C++ parser needs to
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look up a symbol. This gives the caller a chance to lazily
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instantiate symbols using other parts of the gcc_cp_fe_interface
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API. The symbol is looked up without a scope, and the oracle
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must supply a definition for ALL namespace-scoped definitions
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bound to the symbol.
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The address oracle is called whenever the C++ parser needs to
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look up a symbol. This may be called for symbols not provided by
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the symbol oracle, such as built-in functions where GCC provides
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the declaration; other internal symbols, such as those related
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with thunks, rtti, and virtual tables are likely to be queried
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through this interface too. The identifier is a mangled symbol
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name.
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DATUM is an arbitrary piece of data that is passed back verbatim
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to the callbacks in requests. */
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void (*set_callbacks) (struct gcc_cp_context *self,
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gcc_cp_oracle_function *binding_oracle,
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gcc_cp_symbol_address_function *address_oracle,
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gcc_cp_enter_leave_user_expr_scope_function *enter_scope,
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gcc_cp_enter_leave_user_expr_scope_function *leave_scope,
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void *datum);
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#define GCC_METHOD0(R, N) \
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R (*N) (struct gcc_cp_context *);
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#define GCC_METHOD1(R, N, A) \
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R (*N) (struct gcc_cp_context *, A);
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#define GCC_METHOD2(R, N, A, B) \
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R (*N) (struct gcc_cp_context *, A, B);
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#define GCC_METHOD3(R, N, A, B, C) \
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R (*N) (struct gcc_cp_context *, A, B, C);
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#define GCC_METHOD4(R, N, A, B, C, D) \
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R (*N) (struct gcc_cp_context *, A, B, C, D);
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#define GCC_METHOD5(R, N, A, B, C, D, E) \
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R (*N) (struct gcc_cp_context *, A, B, C, D, E);
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#define GCC_METHOD7(R, N, A, B, C, D, E, F, G) \
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R (*N) (struct gcc_cp_context *, A, B, C, D, E, F, G);
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#include "gcc-cp-fe.def"
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#undef GCC_METHOD0
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#undef GCC_METHOD1
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#undef GCC_METHOD2
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#undef GCC_METHOD3
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#undef GCC_METHOD4
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#undef GCC_METHOD5
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#undef GCC_METHOD7
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};
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/* The C front end object. */
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struct gcc_cp_context
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{
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/* Base class. */
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struct gcc_base_context base;
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/* Our vtable. This is a separate field because this is simpler
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than implementing a vtable inheritance scheme in C. */
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const struct gcc_cp_fe_vtable *cp_ops;
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};
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/* The name of the .so that the compiler builds. We dlopen this
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later. */
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#define GCC_CP_FE_LIBCC libcc1.so
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/* The compiler exports a single initialization function. This macro
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holds its name as a symbol. */
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#define GCC_CP_FE_CONTEXT gcc_cp_fe_context
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/* The type of the initialization function. The caller passes in the
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desired base version and desired C-specific version. If the
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request can be satisfied, a compatible gcc_context object will be
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returned. In particular, this may return a context object with a higher
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actual version number than was requested, provided the higher version is
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fully compatible.
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Otherwise, the function returns NULL. */
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typedef struct gcc_cp_context *gcc_cp_fe_context_function
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(enum gcc_base_api_version,
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enum gcc_cp_api_version);
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#ifdef __cplusplus
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}
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#endif
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#endif /* GCC_CP_INTERFACE_H */
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