From 078a020797210f4d8f9491bbfe16ec31e9efb652 Mon Sep 17 00:00:00 2001 From: Keith Seitz Date: Wed, 29 Aug 2018 15:12:24 -0700 Subject: C++ compile support This patch adds *basic* support for C++ to the compile feature. It does most simple type conversions, including everything that C compile does and your basic "with-classes" type of C++. I've written a new compile-support.exp support file which adds a new test facility for automating and simplifying "compile print" vs "compile code" testing. See testsuite/lib/compile-support.exp and CompileExpression for more on that. The tests use this facility extensively. This initial support has several glaring omissions: - No template support at all I have follow-on patches for this, but they add much complexity to this "basic" support. Consequently, they will be submitted separately. - Cannot print functions The code template needs tweaking, and I simply haven't gotten to it yet. - So-called "special function" support is not included Using constructors, destructors, operators, etc will not work. I have follow-on patches for that, but they require some work because of the recent churn in symbol searching. - There are several test suite references to "compile/1234" bugs. I will file bugs and update the test suite's bug references before pushing these patches. The test suite started as a copy of the original C-language support, but I have written tests to exercise the basic functionality of the plug-in. I've added a new option for outputting debug messages for C++ type-conversion ("debug compile-cplus-types"). gdb/ChangeLog: * Makefile.in (SUBDIR_GCC_COMPILE_SRCS): Add compile-cplus-symbols.c and compile-cplus-types.c. (HFILES_NO_SRCDIR): Add gcc-cp-plugin.h. * c-lang.c (cplus_language_defn): Set C++ compile functions. * c-lang.h (cplus_get_compile_context, cplus_compute_program): Declare. * compile/compile-c-support.c: Include compile-cplus.h. (load_libcompile): Templatize. (get_compile_context): "New" function. (c_get_compile_context): Use get_compile_context. (cplus_get_compile_context): New function. (cplus_push_user_expression, cplus_pop_user_expression) (cplus_add_code_header, cplus_add_input, cplus_compile_program) (cplus_compute_program): Define new structs/functions. * compile/compile-cplus-symmbols.c: New file. * compile/compile-cplus-types.c: New file. * compile/compile-cplus.h: New file. * compile/compile-internal.h (debug_compile_oracle, GCC_TYPE_NONE): Declare. * compile/compile-object-load.c (get_out_value_type): Use strncmp_iw when comparing symbol names. (compile_object_load): Add mst_bss and mst_data. * compile/compile.c (_initialize_compile): Remove -Wno-implicit-function-declaration from `compile_args'. * compile/gcc-cp-plugin.h: New file. * NEWS: Mention C++ compile support and new debug options. gdb/testsuite/ChangeLog: * gdb.compile/compile-cplus-anonymous.cc: New file. * gdb.compile/compile-cplus-anonymous.exp: New file. * gdb.compile/compile-cplus-array-decay.cc: New file. * gdb.compile/compile-cplus-array-decay.exp: New file. * gdb.compile/compile-cplus-inherit.cc: New file. * gdb.compile/compile-cplus-inherit.exp: New file. * gdb.compile/compile-cplus-member.cc: New file. * gdb.compile/compile-cplus-member.exp: New file. * gdb.compile/compile-cplus-method.cc: New file. * gdb.compile/compile-cplus-method.exp: New file. * gdb.compile/compile-cplus-mod.c: "New" file. * gdb.compile/compile-cplus-namespace.cc: New file. * gdb.compile/compile-cplus-namespace.exp: New file. * gdb.compile/compile-cplus-nested.cc: New file. * gdb.compile/compile-cplus-nested.exp: New file. * gdb.compile/compile-cplus-print.c: "New" file. * gdb.compile/compile-cplus-print.exp: "New" file. * gdb.compile/compile-cplus-virtual.cc: New file. * gdb.compile/compile-cplus-virtual.exp: New file. * gdb.compile/compile-cplus.c: "New" file. * gdb.compile/compile-cplus.exp: "New" file. * lib/compile-support.exp: New file. doc/ChangeLog: * gdb.texinfo (Compiling and injecting code in GDB): Document set/show "compile-oracle" and "compile-cplus-types" commands. --- gdb/compile/compile-cplus.h | 205 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 205 insertions(+) create mode 100644 gdb/compile/compile-cplus.h (limited to 'gdb/compile/compile-cplus.h') diff --git a/gdb/compile/compile-cplus.h b/gdb/compile/compile-cplus.h new file mode 100644 index 0000000..7baa57d --- /dev/null +++ b/gdb/compile/compile-cplus.h @@ -0,0 +1,205 @@ +/* Header file for GDB compile C++ language support. + Copyright (C) 2016-2018 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 . */ + +#ifndef GDB_COMPILE_CPLUS_H +#define GDB_COMPILE_CPLUS_H + +#include "common/enum-flags.h" +#include "gcc-cp-plugin.h" + +struct type; +struct block; + +/* enum-flags wrapper */ +DEF_ENUM_FLAGS_TYPE (enum gcc_cp_qualifiers, gcc_cp_qualifiers_flags); +DEF_ENUM_FLAGS_TYPE (enum gcc_cp_ref_qualifiers, gcc_cp_ref_qualifiers_flags); +DEF_ENUM_FLAGS_TYPE (enum gcc_cp_symbol_kind, gcc_cp_symbol_kind_flags); + +class compile_cplus_instance; + +/* A single component of a type's scope. Type names are broken into + "components," a series of unqualified names comprising the type name, + e.g., "namespace1", "namespace2", "myclass". */ + +struct scope_component +{ + /* The unqualified name of this scope. */ + std::string name; + + /* The block symbol for this type/scope. */ + struct block_symbol bsymbol; +}; + +/* Comparison operators for scope_components. */ + +bool operator== (const scope_component &lhs, const scope_component &rhs); +bool operator!= (const scope_component &lhs, const scope_component &rhs); + + +/* A single compiler scope used to define a type. + + A compile_scope is a list of scope_components, where all leading + scope_components are namespaces, followed by a single non-namespace + type component (the actual type we are converting). */ + +class compile_scope : private std::vector +{ +public: + + using std::vector::push_back; + using std::vector::pop_back; + using std::vector::back; + using std::vector::empty; + using std::vector::size; + using std::vector::begin; + using std::vector::end; + using std::vector::operator[]; + + compile_scope () + : m_nested_type (GCC_TYPE_NONE), m_pushed (false) + { + } + + /* Return the gcc_type of the type if it is a nested definition. + Returns GCC_TYPE_NONE if this type was not nested. */ + gcc_type nested_type () + { + return m_nested_type; + } + +private: + + /* compile_cplus_instance is a friend class so that it can set the + following private members when compile_scopes are created. */ + friend compile_cplus_instance; + + /* If the type was actually a nested type, this will hold that nested + type after the scope is pushed. */ + gcc_type m_nested_type; + + /* If true, this scope was pushed to the compiler and all namespaces + must be popped when leaving the scope. */ + bool m_pushed; +}; + +/* Comparison operators for compile_scopes. */ + +bool operator== (const compile_scope &lhs, const compile_scope &rhs); +bool operator!= (const compile_scope &lhs, const compile_scope &rhs); + +/* Convert TYPENAME into a vector of namespace and top-most/super + composite scopes. + + For example, for the input "Namespace::classB::classInner", the + resultant vector will contain the tokens "Namespace" and + "classB". */ + +compile_scope type_name_to_scope (const char *type_name, + const struct block *block); + +/* A callback suitable for use as the GCC C++ symbol oracle. */ + +extern gcc_cp_oracle_function gcc_cplus_convert_symbol; + +/* A callback suitable for use as the GCC C++ address oracle. */ + +extern gcc_cp_symbol_address_function gcc_cplus_symbol_address; + +/* A subclass of compile_instance that is specific to the C++ front + end. */ + +class compile_cplus_instance : public compile_instance +{ +public: + + explicit compile_cplus_instance (struct gcc_cp_context *gcc_cp) + : compile_instance (&gcc_cp->base, m_default_cflags), + m_plugin (gcc_cp) + { + m_plugin.set_callbacks (gcc_cplus_convert_symbol, + gcc_cplus_symbol_address, + gcc_cplus_enter_scope, gcc_cplus_leave_scope, + this); + } + + /* Convert a gdb type, TYPE, to a GCC type. + + If this type was defined in another type, NESTED_ACCESS should indicate + the accessibility of this type (or GCC_CP_ACCESS_NONE if not a nested + type). GCC_CP_ACCESS_NONE is the default nested access. + + The new GCC type is returned. */ + gcc_type convert_type + (struct type *type, + enum gcc_cp_symbol_kind nested_access = GCC_CP_ACCESS_NONE); + + /* Return a handle for the GCC plug-in. */ + gcc_cp_plugin &plugin () { return m_plugin; } + + /* Factory method to create a new scope based on TYPE with name TYPE_NAME. + [TYPE_NAME could be TYPE_NAME or SYMBOL_NATURAL_NAME.] + + If TYPE is a nested or local definition, nested_type () will return + the gcc_type of the conversion. + + Otherwise, nested_type () is GCC_TYPE_NONE. */ + compile_scope new_scope (const char *type_name, struct type *type); + + /* Enter the given NEW_SCOPE. */ + void enter_scope (compile_scope &scope); + + /* Leave the current scope. */ + void leave_scope (); + + /* Add the qualifiers given by QUALS to BASE. */ + gcc_type convert_qualified_base (gcc_type base, + gcc_cp_qualifiers_flags quals); + + /* Convert TARGET into a pointer type. */ + gcc_type convert_pointer_base (gcc_type target); + + /* Convert BASE into a reference type. RQUALS describes the reference. */ + gcc_type convert_reference_base (gcc_type base, + enum gcc_cp_ref_qualifiers rquals); + + /* Return the declaration name of the symbol named NATURAL. + This returns a name with no function arguments or template parameters, + suitable for passing to the compiler plug-in. */ + static gdb::unique_xmalloc_ptr decl_name (const char *natural); + +private: + + /* Callbacks suitable for use as the GCC C++ enter/leave scope requests. */ + static gcc_cp_enter_leave_user_expr_scope_function gcc_cplus_enter_scope; + static gcc_cp_enter_leave_user_expr_scope_function gcc_cplus_leave_scope; + + /* Default compiler flags for C++. */ + static const char *m_default_cflags; + + /* The GCC plug-in. */ + gcc_cp_plugin m_plugin; + + /* A list of scopes we are processing. */ + std::vector m_scopes; +}; + +/* Get the access flag for the NUM'th method of TYPE's FNI'th + fieldlist. */ + +enum gcc_cp_symbol_kind get_method_access_flag (const struct type *type, + int fni, int num); + +#endif /* GDB_COMPILE_CPLUS_H */ -- cgit v1.1