1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
|
/*
*/
#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::MetaItems& attrs)
{
for(const auto& at : attrs.m_items) {
if( at.name() == "cfg" && !check_cfg(attrs.m_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(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,
const auto& name = c.name;
if( check_item_cfg(it.data.attrs) )
{
load_extern_crate( it.data.span, 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(this->m_attrs.m_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 ) {
this->load_extern_crate(Span(), "core");
}
else {
this->load_extern_crate(Span(), "std");
}
}
void Crate::load_extern_crate(Span sp, const ::std::string& name)
{
DEBUG("Loading crate '" << name << "'");
::std::string path;
auto it = g_crate_overrides.find(name);
if(it != g_crate_overrides.end())
{
path = it->second;
}
else
{
// Search a list of load paths for the crate
for(const auto& p : g_crate_load_dirs)
{
path = p + "/lib" + name + ".hir";
if( ::std::ifstream(path).good() ) {
break ;
}
}
}
if( !::std::ifstream(path).good() ) {
ERROR(sp, E0000, "Unable to locate crate '" << name << "'");
}
auto res = m_extern_crates.insert(::std::make_pair( name, ExternCrate { name, path } ));
auto crate_ext_list = mv$( res.first->second.m_hir->m_ext_crates );
// Load referenced crates
for( const auto& ext : crate_ext_list )
{
if( m_extern_crates.count(ext.first) == 0 )
{
this->load_extern_crate(sp, ext.first);
}
}
}
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);
}
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
|
