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/*
*/
#include "crate.hpp"
#include "ast.hpp"
#include "../parse/parseerror.hpp"
#include "../expand/cfg.hpp"
#include <hir/hir.hpp> // HIR::Crate
#include <hir/main_bindings.hpp> // HIR_Deserialise
#include <fstream>
::std::vector<::std::string> AST::g_crate_load_dirs = { };
::std::map<::std::string, ::std::string> AST::g_crate_overrides;
namespace {
bool check_item_cfg(const ::AST::AttributeList& attrs)
{
for(const auto& at : attrs.m_items) {
if( at.name() == "cfg" && !check_cfg(at.span(), at) ) {
return false;
}
}
return true;
}
void iterate_module(::AST::Module& mod, ::std::function<void(::AST::Module& mod)> fcn)
{
fcn(mod);
for( auto& sm : mod.items() )
{
TU_IFLET(::AST::Item, sm.data, Module, e,
if( check_item_cfg(sm.data.attrs) )
{
iterate_module(e, fcn);
}
)
}
// TODO: What about if an anon mod has been #[cfg]-d out?
// - For now, disable
//for(const auto& anon : mod.anon_mods() ) {
// iterate_module(*anon, fcn);
//}
}
}
namespace AST {
Crate::Crate():
m_root_module(::AST::Path("",{})),
m_load_std(LOAD_STD)
{
}
void Crate::load_externs()
{
auto cb = [this](Module& mod) {
for( /*const*/ auto& it : mod.items() )
{
TU_IFLET(AST::Item, it.data, Crate, c,
if( check_item_cfg(it.data.attrs) )
{
c.name = load_extern_crate( it.data.span, c.name );
}
)
}
};
iterate_module(m_root_module, cb);
// Check for no_std or no_core, and load libstd/libcore
// - Duplicates some of the logic in "Expand", but also helps keep crate loading separate to most of expand
// NOTE: Not all crates are loaded here, any crates loaded by macro invocations will be done during expand.
bool no_std = false;
bool no_core = false;
for( const auto& a : this->m_attrs.m_items )
{
if( a.name() == "no_std" )
no_std = true;
if( a.name() == "no_core" )
no_core = true;
if( a.name() == "cfg_attr" && a.items().size() == 2 ) {
if( check_cfg(a.span(), a.items().at(0)) )
{
const auto& a2 = a.items().at(1);
if( a2.name() == "no_std" )
no_std = true;
if( a2.name() == "no_core" )
no_core = true;
}
}
}
if( no_core ) {
// Don't load anything
}
else if( no_std ) {
auto n = this->load_extern_crate(Span(), "core");
ASSERT_BUG(Span(), n == "core", "libcore wasn't loaded as `core`, instead `" << n << "`");
}
else {
auto n = this->load_extern_crate(Span(), "std");
ASSERT_BUG(Span(), n == "std", "libstd wasn't loaded as `std`, instead `" << n << "`");
}
}
// TODO: Handle disambiguating crates with the same name (e.g. libc in std and crates.io libc)
// - Crates recorded in rlibs should specify a hash/tag that's passed in to this function.
::std::string Crate::load_extern_crate(Span sp, const ::std::string& name, const ::std::string& basename/*=""*/)
{
DEBUG("Loading crate '" << name << "'");
::std::string path;
auto it = g_crate_overrides.find(name);
if(basename == "" && it != g_crate_overrides.end())
{
path = it->second;
if( !::std::ifstream(path).good() ) {
ERROR(sp, E0000, "Unable to open crate '" << name << "' at path " << path);
}
}
else
{
// Search a list of load paths for the crate
for(const auto& p : g_crate_load_dirs)
{
if( basename == "" )
{
path = p + "/lib" + name + ".hir";
// TODO: Search for `p+"/lib"+name+"-*.hir" (which would match e.g. libnum-0.11.hir)
}
else
{
path = p + "/" + basename;
}
if( ::std::ifstream(path).good() ) {
break ;
}
}
if( !::std::ifstream(path).good() ) {
if( basename.empty() )
ERROR(sp, E0000, "Unable to locate crate '" << name << "' in search directories");
else
ERROR(sp, E0000, "Unable to locate crate '" << name << "' with filename " << basename << " in search directories");
}
}
// NOTE: Creating `ExternCrate` loads the crate from the specified path
auto ec = ExternCrate { name, path };
auto real_name = ec.m_hir->m_crate_name;
assert(!real_name.empty());
auto res = m_extern_crates.insert(::std::make_pair( real_name, mv$(ec) ));
if( !res.second ) {
// Crate already loaded?
}
auto& ext_crate = res.first->second;
// Move the external list out (doesn't need to be kept in the nested crate)
auto crate_ext_list = mv$( ext_crate.m_hir->m_ext_crates );
// Load referenced crates
for( const auto& ext : crate_ext_list )
{
if( m_extern_crates.count(ext.first) == 0 )
{
const auto load_name = this->load_extern_crate(sp, ext.first, ext.second.m_basename);
if( load_name != ext.first )
{
// ERROR - The crate loaded wasn't the one that was used when compiling this crate.
ERROR(sp, E0000, "The crate file `" << ext.second.m_basename << "` didn't load the expected crate - have " << load_name << " != exp " << ext.first);
}
}
}
DEBUG("Loaded '" << name << "' from '" << basename << "' (actual name is '" << real_name << "')");
return real_name;
}
ExternCrate::ExternCrate(const ::std::string& name, const ::std::string& path):
m_name(name),
m_filename(path)
{
TRACE_FUNCTION_F("name=" << name << ", path='" << path << "'");
m_hir = HIR_Deserialise(path, name);
m_hir->post_load_update(name);
m_name = m_hir->m_crate_name;
}
void ExternCrate::with_all_macros(::std::function<void(const ::std::string& , const MacroRules&)> cb) const
{
for(const auto& m : m_hir->m_exported_macros)
{
cb(m.first, *m.second);
}
}
const MacroRules* ExternCrate::find_macro_rules(const ::std::string& name) const
{
auto i = m_hir->m_exported_macros.find(name);
if(i != m_hir->m_exported_macros.end())
return &*i->second;
return nullptr;
}
} // namespace AST
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