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// file : libbuild2/cc/module.hxx -*- C++ -*-
// license : MIT; see accompanying LICENSE file
#ifndef LIBBUILD2_CC_MODULE_HXX
#define LIBBUILD2_CC_MODULE_HXX
#include <unordered_map>
#include <libbuild2/types.hxx>
#include <libbuild2/utility.hxx>
#include <libbuild2/module.hxx>
#include <libbuild2/variable.hxx>
#include <libbuild2/cc/common.hxx>
#include <libbuild2/cc/compiledb.hxx>
#include <libbuild2/cc/compile-rule.hxx>
#include <libbuild2/cc/link-rule.hxx>
#include <libbuild2/cc/install-rule.hxx>
#include <libbuild2/cc/predefs-rule.hxx>
#include <libbuild2/cc/export.hxx>
namespace build2
{
namespace cc
{
struct compiler_info;
// cc.core module
//
class core_module: public build2::module
{
public:
static const string name;
explicit
core_module (const core_module* om)
: outer_module_ (om)
{
}
public:
const core_module* outer_module_;
strings cdb_names_;
const compiledb_name_filter* cdb_filter_ = nullptr;
const compiledb_type_filter* cdb_filter_input_ = nullptr;
const compiledb_type_filter* cdb_filter_output_ = nullptr;
compiledb_name_filter cdb_filter_storage_;
compiledb_type_filter cdb_filter_input_storage_;
compiledb_type_filter cdb_filter_output_storage_;
};
// x.config module
//
class LIBBUILD2_CC_SYMEXPORT config_module: public build2::module,
public config_data
{
public:
explicit
config_module (config_data&& d) : config_data (move (d)) {}
// We split the configuration process into into two parts: guessing the
// compiler information and the actual configuration. This allows one to
// adjust configuration (say the standard or enabled experimental
// features) base on the compiler information by first loading the
// guess module.
//
void
guess (scope&, const location&, const variable_map&);
void
init (scope&, const location&, const variable_map&);
// Translate the x.std value (if any) to the standard-selecting
// option(s) (if any) and fold them (normally by pre-pending) into the
// compiler mode options.
//
// This function may also check/set [config.]x.features.* variables on
// the root scope.
//
virtual void
translate_std (const compiler_info&,
const target_triplet&,
scope&,
strings&,
const string*) const = 0;
const compiler_info* x_info;
string env_checksum; // Environment checksum (also in x.path).
// Cached x.internal.scope value.
//
using internal_scope = data::internal_scope;
optional<internal_scope> iscope;
const scope* iscope_current = nullptr;
// Temporary storage for data::sys_*_dirs_*.
//
size_t sys_lib_dirs_mode;
size_t sys_hdr_dirs_mode;
size_t sys_mod_dirs_mode;
size_t sys_lib_dirs_extra;
size_t sys_hdr_dirs_extra;
bool new_config = false; // See guess() and init() for details.
// Header cache (see compile_rule::enter_header()).
//
// We place it into the config module so that we have an option of
// sharing it for the entire weak amalgamation.
//
public:
// Keep the hash in the key. This way we can compute it outside of the
// lock.
//
struct header_key
{
// We used to use path comparison/hash which are case-insensitive on
// Windows. While this sounds right on the surface, the catch is that
// our target names are always case-sensitive, even on Windows. So
// what can happen is that the same header spelled in different case
// ends up with distinct targets but trying to occupy the same cache
// entry. See GH issue #390 for details.
//
// The conceptually correct way to fix this would be to actualize the
// header name. But that would be prohibitively expensive, especially
// on Windows. Plus the header may be generated and thus not yet
// exist.
//
// On the other hand, we can already end up with different targets
// mapped to the same filesystem entry in other situations (h{} vs
// hxx{} is the canonical example). And we are ok with that provided
// they have noop recipes. So it feels like the simplest solution here
// is to go along by having case-sensitive cache entries. This means
// that auto-generated headers will have to be included using the same
// spelling, but that seems like a sensible restriction (doing
// otherwise won't be portable).
//
path file;
size_t hash;
friend bool
operator== (const header_key& x, const header_key& y)
{
// Note: hash was already compared.
//
return x.file.string () == y.file.string ();
}
};
struct header_key_hasher
{
size_t operator() (const header_key& k) const {return k.hash;}
};
mutable shared_mutex header_map_mutex;
mutable std::unordered_map<header_key,
const file*,
header_key_hasher> header_map;
private:
// Defined in gcc.cxx.
//
pair<dir_paths, size_t>
gcc_header_search_dirs (const compiler_info&, scope&) const;
pair<dir_paths, size_t>
gcc_library_search_dirs (const compiler_info&, scope&) const;
// Defined in msvc.cxx.
//
pair<dir_paths, size_t>
msvc_header_search_dirs (const compiler_info&, scope&) const;
pair<dir_paths, size_t>
msvc_library_search_dirs (const compiler_info&, scope&) const;
};
// x module
//
class LIBBUILD2_CC_SYMEXPORT module: public build2::module,
public virtual common,
public link_rule,
public compile_rule,
public install_rule,
public libux_install_rule,
public predefs_rule
{
public:
module (data&& d, const scope& rs)
: common (move (d)),
link_rule (move (d)),
compile_rule (move (d), rs),
install_rule (move (d), *this),
libux_install_rule (move (d), *this),
predefs_rule (move (d)) {}
void
init (scope&,
const location&,
const variable_map&,
const compiler_info&);
};
}
}
#endif // LIBBUILD2_CC_MODULE_HXX
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