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// file : libbuild2/module.cxx -*- C++ -*-
// copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
// license : MIT; see accompanying LICENSE file
#include <libbuild2/module.hxx>
#ifndef BUILD2_BOOTSTRAP
# ifndef _WIN32
# include <dlfcn.h>
# else
# include <libbutl/win32-utility.hxx>
# endif
#endif
#include <libbuild2/file.hxx> // import()
#include <libbuild2/scope.hxx>
#include <libbuild2/variable.hxx>
#include <libbuild2/diagnostics.hxx>
// Core modules bundled with libbuild2.
//
#include <libbuild2/dist/init.hxx>
#include <libbuild2/test/init.hxx>
#include <libbuild2/config/init.hxx>
#include <libbuild2/install/init.hxx>
using namespace std;
using namespace butl;
namespace build2
{
loaded_module_map loaded_modules;
// Sorted array of bundled modules (excluding core modules bundled with
// libbuild2; see below).
//
static const char* bundled_modules[] = {
"bash",
"in",
"version"
};
static inline bool
bundled_module (const string& mod)
{
return binary_search (
bundled_modules,
bundled_modules + sizeof (bundled_modules) / sizeof (*bundled_modules),
mod);
}
static module_load_function*
import_module (scope& /*bs*/,
const string& mod,
const location& loc,
bool boot,
bool opt)
{
// Take care of core modules that are bundled with libbuild2 in case they
// are not pre-loaded by the driver.
//
if (mod == "config") return &config::build2_config_load;
else if (mod == "dist") return &dist::build2_dist_load;
else if (mod == "install") return &install::build2_install_load;
else if (mod == "test") return &test::build2_test_load;
bool bundled (bundled_module (mod));
// Importing external modules during bootstrap is problematic: we haven't
// loaded config.build nor entered all the variable overrides so it's not
// clear what import() can do except confuse matters. So this requires
// more thinking.
//
if (boot && !bundled)
{
fail (loc) << "unable to load build system module " << mod <<
info << "loading external modules during bootstrap is not yet "
<< "supported";
}
module_load_function* r (nullptr);
// No dynamic loading of build system modules during bootstrap.
//
#ifdef BUILD2_BOOTSTRAP
if (!opt)
fail (loc) << "unknown build system module " << mod <<
info << "running bootstrap build system";
#else
path lib;
#if 0
// See if we can import a target for this module.
//
// Check if one of the bundled modules, if so, the project name is
// build2, otherwise -- libbuild2-<mod>.
//
// The target we are looking for is <prj>%lib{build2-<mod>}.
//
name tgt (
import (bs,
name (bundled ? "build2" : "libbuild2-" + mod,
dir_path (),
"lib",
"build2-" + mod),
loc));
if (!tgt.qualified ())
{
// Switch the phase and update the target. This will also give us the
// shared library path.
//
// @@ TODO
//
}
else
#endif
{
// No luck. Form the shared library name (incorporating build system
// core version) and try using system-default search (installed, rpath,
// etc).
// @@ This is unfortunate: it would have been nice to do something
// similar to what we've done for exe{}. While libs{} is in the bin
// module, we could bring it in (we've done it for exe{}). The
// problems are: it is intertwined with its group (lib{}) and we
// don't have any mechanisms to deal with prefixes, only extensions.
//
const char* pfx;
const char* sfx;
#if defined(_WIN32)
pfx = "build2-"; sfx = ".dll";
#elif defined(__APPLE__)
pfx = "libbuild2-"; sfx = ".dylib";
#else
pfx = "libbuild2-"; sfx = ".so";
#endif
lib = path (pfx + mod + '-' + build_version_interface + sfx);
}
string sym (sanitize_identifier ("build2_" + mod + "_load"));
// Note that we don't unload our modules since it's not clear what would
// the benefit be.
//
#ifndef _WIN32
// Use RTLD_NOW instead of RTLD_LAZY to both speed things up (we are going
// to use this module now) and to detect any symbol mismatches.
//
if (void* h = dlopen (lib.string ().c_str (), RTLD_NOW | RTLD_GLOBAL))
{
r = function_cast<module_load_function*> (dlsym (h, sym.c_str ()));
// I don't think we should ignore this even if optional.
//
if (r == nullptr)
fail (loc) << "unable to lookup " << sym << " in build system module "
<< mod << " (" << lib << "): " << dlerror ();
}
else if (!opt)
fail (loc) << "unable to load build system module " << mod
<< " (" << lib << "): " << dlerror ();
#else
if (HMODULE h = LoadLibrary (lib.string ().c_str ()))
{
r = function_cast<module_load_function*> (
GetProcAddress (h, sym.c_str ()));
if (r == nullptr)
fail (loc) << "unable to lookup " << sym << " in build system module "
<< mod << " (" << lib << "): " << win32::last_error_msg ();
}
else if (!opt)
fail (loc) << "unable to load build system module " << mod
<< " (" << lib << "): " << win32::last_error_msg ();
#endif
#endif // BUILD2_BOOTSTRAP
return r;
}
static const module_functions*
find_module (scope& bs,
const string& smod,
const location& loc,
bool boot,
bool opt)
{
// Optional modules and submodules sure make this logic convoluted. So we
// divide it into two parts: (1) find or insert an entry (for submodule
// or, failed that, for the main module, the latter potentially NULL) and
// (2) analyze the entry and issue diagnostics.
//
auto i (loaded_modules.find (smod)), e (loaded_modules.end ());
if (i == e)
{
// If this is a submodule, get the main module name.
//
string mmod (smod, 0, smod.find ('.'));
if (mmod != smod)
i = loaded_modules.find (mmod);
if (i == e)
{
module_load_function* f (import_module (bs, mmod, loc, boot, opt));
if (f != nullptr)
{
// Enter all the entries noticing which one is our submodule. If
// none are, then we notice the main module.
//
for (const module_functions* j (f ()); j->name != nullptr; ++j)
{
const string& n (j->name);
auto p (loaded_modules.emplace (n, j));
if (!p.second)
fail (loc) << "build system submodule name " << n << " of main "
<< "module " << mmod << " is already in use";
if (n == smod || (i == e && n == mmod))
i = p.first;
}
// We should at least have the main module.
//
if (i == e)
fail (loc) << "invalid function list in build system module "
<< mmod;
}
else
i = loaded_modules.emplace (move (mmod), nullptr).first;
}
}
// Now the iterator points to a submodule or to the main module, the
// latter potentially NULL.
//
if (!opt)
{
if (i->second == nullptr)
{
fail (loc) << "unable to load build system module " << i->first;
}
else if (i->first != smod)
{
fail (loc) << "build system module " << i->first << " has no "
<< "submodule " << smod;
}
}
// Note that if the main module exists but has no such submodule, we
// return NULL rather than fail (think of an older version of a module
// that doesn't implement some extra functionality).
//
return i->second;
}
void
boot_module (scope& rs, const string& mod, const location& loc)
{
// First see if this modules has already been booted for this project.
//
module_map& lm (rs.root_extra->modules);
auto i (lm.find (mod));
if (i != lm.end ())
{
module_state& s (i->second);
// The only valid situation here is if the module has already been
// bootstrapped.
//
assert (s.boot);
return;
}
// Otherwise search for this module.
//
const module_functions& mf (
*find_module (rs, mod, loc, true /* boot */, false /* optional */));
if (mf.boot == nullptr)
fail (loc) << "build system module " << mod << " should not be loaded "
<< "during bootstrap";
i = lm.emplace (mod,
module_state {true, false, mf.init, nullptr, loc}).first;
i->second.first = mf.boot (rs, loc, i->second.module);
rs.assign (rs.ctx.var_pool.rw (rs).insert (mod + ".booted")) = true;
}
bool
init_module (scope& rs,
scope& bs,
const string& mod,
const location& loc,
bool opt,
const variable_map& hints)
{
// First see if this modules has already been inited for this project.
//
module_map& lm (rs.root_extra->modules);
auto i (lm.find (mod));
bool f (i == lm.end ());
if (f)
{
// Otherwise search for this module.
//
if (const module_functions* mf = find_module (
rs, mod, loc, false /* boot */, opt))
{
if (mf->boot != nullptr)
fail (loc) << "build system module " << mod << " should be loaded "
<< "during bootstrap";
i = lm.emplace (
mod,
module_state {false, false, mf->init, nullptr, loc}).first;
}
}
else
{
module_state& s (i->second);
if (s.boot)
{
s.boot = false;
f = true; // This is a first call to init.
}
}
// Note: pattern-typed in context.cxx:reset() as project-visibility
// variables of type bool.
//
// We call the variable 'loaded' rather than 'inited' because it is
// buildfile-visible (where we use the term "load a module"; see the note
// on terminology above)
//
auto& vp (rs.ctx.var_pool.rw (rs));
value& lv (bs.assign (vp.insert (mod + ".loaded")));
value& cv (bs.assign (vp.insert (mod + ".configured")));
bool l; // Loaded (initialized).
bool c; // Configured.
// Suppress duplicate init() calls for the same module in the same scope.
//
if (!lv.null)
{
assert (!cv.null);
l = cast<bool> (lv);
c = cast<bool> (cv);
if (!opt)
{
if (!l)
fail (loc) << "unable to load build system module " << mod;
// We don't have original diagnostics. We could call init() again so
// that it can issue it. But that means optional modules must be
// prepared to be called again if configuring failed. Let's keep it
// simple for now.
//
if (!c)
fail (loc) << "build system module " << mod << " failed to "
<< "configure";
}
}
else
{
l = i != lm.end ();
c = l && i->second.init (rs, bs, loc, i->second.module, f, opt, hints);
lv = l;
cv = c;
}
return l && c;
}
}
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