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// Copyright 2015 Google Inc. All rights reserved
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// +build ignore
//#define ENABLE_TID_CHECK
#include "symtab.h"
#ifdef ENABLE_TID_CHECK
#include <pthread.h>
#endif
#include <string.h>
#include <unordered_map>
#include "log.h"
#include "strutil.h"
#include "var.h"
struct SymbolData {
SymbolData() : gv(kUndefined) {}
Var* gv;
};
vector<string*>* g_symbols;
static vector<SymbolData> g_symbol_data;
Symbol kEmptySym = Symbol(Symbol::IsUninitialized());
Symbol kShellSym = Symbol(Symbol::IsUninitialized());
Symbol::Symbol(int v) : v_(v) {}
Var* Symbol::PeekGlobalVar() const {
if (static_cast<size_t>(v_) >= g_symbol_data.size()) {
return kUndefined;
}
return g_symbol_data[v_].gv;
}
Var* Symbol::GetGlobalVar() const {
if (static_cast<size_t>(v_) >= g_symbol_data.size()) {
g_symbol_data.resize(v_ + 1);
}
Var* v = g_symbol_data[v_].gv;
if (v->Origin() == VarOrigin::ENVIRONMENT ||
v->Origin() == VarOrigin::ENVIRONMENT_OVERRIDE) {
Vars::add_used_env_vars(*this);
}
return v;
}
void Symbol::SetGlobalVar(Var* v, bool is_override, bool* readonly) const {
if (static_cast<size_t>(v_) >= g_symbol_data.size()) {
g_symbol_data.resize(v_ + 1);
}
Var* orig = g_symbol_data[v_].gv;
if (orig->ReadOnly()) {
if (readonly != nullptr)
*readonly = true;
else
ERROR("*** cannot assign to readonly variable: %s", c_str());
return;
} else if (readonly != nullptr) {
*readonly = false;
}
if (!is_override && (orig->Origin() == VarOrigin::OVERRIDE ||
orig->Origin() == VarOrigin::ENVIRONMENT_OVERRIDE)) {
return;
}
if (orig->Origin() == VarOrigin::COMMAND_LINE &&
v->Origin() == VarOrigin::FILE) {
return;
}
if (orig->Origin() == VarOrigin::AUTOMATIC) {
ERROR("overriding automatic variable is not implemented yet");
}
if (orig->IsDefined())
delete orig;
g_symbol_data[v_].gv = v;
}
ScopedGlobalVar::ScopedGlobalVar(Symbol name, Var* var)
: name_(name), orig_(NULL) {
orig_ = name.GetGlobalVar();
g_symbol_data[name_.val()].gv = var;
}
ScopedGlobalVar::~ScopedGlobalVar() {
g_symbol_data[name_.val()].gv = orig_;
}
class Symtab {
public:
Symtab() {
#ifdef ENABLE_TID_CHECK
tid_ = pthread_self();
#endif
CHECK(g_symbols == NULL);
g_symbols = &symbols_;
Symbol s = InternImpl("");
CHECK(s.v_ == 0);
CHECK(Intern("") == s);
char b[2];
b[1] = 0;
for (int i = 1; i < 256; i++) {
b[0] = i;
s = InternImpl(b);
CHECK(s.val() == i);
}
kEmptySym = Intern("");
kShellSym = Intern("SHELL");
}
~Symtab() {
LOG_STAT("%zu symbols", symbols_.size());
for (string* s : symbols_)
delete s;
}
Symbol InternImpl(StringPiece s) {
auto found = symtab_.find(s);
if (found != symtab_.end()) {
return found->second;
}
symbols_.push_back(new string(s.data(), s.size()));
Symbol sym = Symbol(symtab_.size());
bool ok = symtab_.emplace(*symbols_.back(), sym).second;
CHECK(ok);
return sym;
}
Symbol Intern(StringPiece s) {
#ifdef ENABLE_TID_CHECK
if (tid_ != pthread_self())
abort();
#endif
if (s.size() <= 1) {
return Symbol(s.empty() ? 0 : (unsigned char)s[0]);
}
return InternImpl(s);
}
private:
unordered_map<StringPiece, Symbol> symtab_;
vector<string*> symbols_;
#ifdef ENABLE_TID_CHECK
pthread_t tid_;
#endif
};
static Symtab* g_symtab;
void InitSymtab() {
g_symtab = new Symtab;
}
void QuitSymtab() {
delete g_symtab;
}
Symbol Intern(StringPiece s) {
return g_symtab->Intern(s);
}
string JoinSymbols(const vector<Symbol>& syms, const char* sep) {
vector<string> strs;
for (Symbol s : syms) {
strs.push_back(s.str());
}
return JoinStrings(strs, sep);
}
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