forked from lix-project/lix
587 lines
15 KiB
C++
587 lines
15 KiB
C++
#include "nixexpr.hh"
|
|
#include "derivations.hh"
|
|
#include "eval.hh"
|
|
#include "symbol-table.hh"
|
|
#include "util.hh"
|
|
|
|
#include <cstdlib>
|
|
|
|
namespace nix {
|
|
|
|
/* Launch the nix debugger */
|
|
|
|
std::function<void(EvalState & evalState,const Error * error, const Env & env, const Expr & expr)> debuggerHook;
|
|
|
|
/* Displaying abstract syntax trees. */
|
|
|
|
static void showString(std::ostream & str, std::string_view s)
|
|
{
|
|
str << '"';
|
|
for (auto c : s)
|
|
if (c == '"' || c == '\\' || c == '$') str << "\\" << c;
|
|
else if (c == '\n') str << "\\n";
|
|
else if (c == '\r') str << "\\r";
|
|
else if (c == '\t') str << "\\t";
|
|
else str << c;
|
|
str << '"';
|
|
}
|
|
|
|
std::ostream & operator <<(std::ostream & str, const SymbolStr & symbol)
|
|
{
|
|
std::string_view s = symbol;
|
|
|
|
if (s.empty())
|
|
str << "\"\"";
|
|
else if (s == "if") // FIXME: handle other keywords
|
|
str << '"' << s << '"';
|
|
else {
|
|
char c = s[0];
|
|
if (!((c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') || c == '_')) {
|
|
showString(str, s);
|
|
return str;
|
|
}
|
|
for (auto c : s)
|
|
if (!((c >= 'a' && c <= 'z') ||
|
|
(c >= 'A' && c <= 'Z') ||
|
|
(c >= '0' && c <= '9') ||
|
|
c == '_' || c == '\'' || c == '-')) {
|
|
showString(str, s);
|
|
return str;
|
|
}
|
|
str << s;
|
|
}
|
|
return str;
|
|
}
|
|
|
|
void Expr::show(const SymbolTable & symbols, std::ostream & str) const
|
|
{
|
|
abort();
|
|
}
|
|
|
|
void ExprInt::show(const SymbolTable & symbols, std::ostream & str) const
|
|
{
|
|
str << n;
|
|
}
|
|
|
|
void ExprFloat::show(const SymbolTable & symbols, std::ostream & str) const
|
|
{
|
|
str << nf;
|
|
}
|
|
|
|
void ExprString::show(const SymbolTable & symbols, std::ostream & str) const
|
|
{
|
|
showString(str, s);
|
|
}
|
|
|
|
void ExprPath::show(const SymbolTable & symbols, std::ostream & str) const
|
|
{
|
|
str << s;
|
|
}
|
|
|
|
void ExprVar::show(const SymbolTable & symbols, std::ostream & str) const
|
|
{
|
|
str << symbols[name];
|
|
}
|
|
|
|
void ExprSelect::show(const SymbolTable & symbols, std::ostream & str) const
|
|
{
|
|
str << "(";
|
|
e->show(symbols, str);
|
|
str << ")." << showAttrPath(symbols, attrPath);
|
|
if (def) {
|
|
str << " or (";
|
|
def->show(symbols, str);
|
|
str << ")";
|
|
}
|
|
}
|
|
|
|
void ExprOpHasAttr::show(const SymbolTable & symbols, std::ostream & str) const
|
|
{
|
|
str << "((";
|
|
e->show(symbols, str);
|
|
str << ") ? " << showAttrPath(symbols, attrPath) << ")";
|
|
}
|
|
|
|
void ExprAttrs::show(const SymbolTable & symbols, std::ostream & str) const
|
|
{
|
|
if (recursive) str << "rec ";
|
|
str << "{ ";
|
|
typedef const decltype(attrs)::value_type * Attr;
|
|
std::vector<Attr> sorted;
|
|
for (auto & i : attrs) sorted.push_back(&i);
|
|
std::sort(sorted.begin(), sorted.end(), [&](Attr a, Attr b) {
|
|
std::string_view sa = symbols[a->first], sb = symbols[b->first];
|
|
return sa < sb;
|
|
});
|
|
for (auto & i : sorted) {
|
|
if (i->second.inherited)
|
|
str << "inherit " << symbols[i->first] << " " << "; ";
|
|
else {
|
|
str << symbols[i->first] << " = ";
|
|
i->second.e->show(symbols, str);
|
|
str << "; ";
|
|
}
|
|
}
|
|
for (auto & i : dynamicAttrs) {
|
|
str << "\"${";
|
|
i.nameExpr->show(symbols, str);
|
|
str << "}\" = ";
|
|
i.valueExpr->show(symbols, str);
|
|
str << "; ";
|
|
}
|
|
str << "}";
|
|
}
|
|
|
|
void ExprList::show(const SymbolTable & symbols, std::ostream & str) const
|
|
{
|
|
str << "[ ";
|
|
for (auto & i : elems) {
|
|
str << "(";
|
|
i->show(symbols, str);
|
|
str << ") ";
|
|
}
|
|
str << "]";
|
|
}
|
|
|
|
void ExprLambda::show(const SymbolTable & symbols, std::ostream & str) const
|
|
{
|
|
str << "(";
|
|
if (hasFormals()) {
|
|
str << "{ ";
|
|
bool first = true;
|
|
for (auto & i : formals->formals) {
|
|
if (first) first = false; else str << ", ";
|
|
str << symbols[i.name];
|
|
if (i.def) {
|
|
str << " ? ";
|
|
i.def->show(symbols, str);
|
|
}
|
|
}
|
|
if (formals->ellipsis) {
|
|
if (!first) str << ", ";
|
|
str << "...";
|
|
}
|
|
str << " }";
|
|
if (arg) str << " @ ";
|
|
}
|
|
if (arg) str << symbols[arg];
|
|
str << ": ";
|
|
body->show(symbols, str);
|
|
str << ")";
|
|
}
|
|
|
|
void ExprCall::show(const SymbolTable & symbols, std::ostream & str) const
|
|
{
|
|
str << '(';
|
|
fun->show(symbols, str);
|
|
for (auto e : args) {
|
|
str << ' ';
|
|
e->show(symbols, str);
|
|
}
|
|
str << ')';
|
|
}
|
|
|
|
void ExprLet::show(const SymbolTable & symbols, std::ostream & str) const
|
|
{
|
|
str << "(let ";
|
|
for (auto & i : attrs->attrs)
|
|
if (i.second.inherited) {
|
|
str << "inherit " << symbols[i.first] << "; ";
|
|
}
|
|
else {
|
|
str << symbols[i.first] << " = ";
|
|
i.second.e->show(symbols, str);
|
|
str << "; ";
|
|
}
|
|
str << "in ";
|
|
body->show(symbols, str);
|
|
str << ")";
|
|
}
|
|
|
|
void ExprWith::show(const SymbolTable & symbols, std::ostream & str) const
|
|
{
|
|
str << "(with ";
|
|
attrs->show(symbols, str);
|
|
str << "; ";
|
|
body->show(symbols, str);
|
|
str << ")";
|
|
}
|
|
|
|
void ExprIf::show(const SymbolTable & symbols, std::ostream & str) const
|
|
{
|
|
str << "(if ";
|
|
cond->show(symbols, str);
|
|
str << " then ";
|
|
then->show(symbols, str);
|
|
str << " else ";
|
|
else_->show(symbols, str);
|
|
str << ")";
|
|
}
|
|
|
|
void ExprAssert::show(const SymbolTable & symbols, std::ostream & str) const
|
|
{
|
|
str << "assert ";
|
|
cond->show(symbols, str);
|
|
str << "; ";
|
|
body->show(symbols, str);
|
|
}
|
|
|
|
void ExprOpNot::show(const SymbolTable & symbols, std::ostream & str) const
|
|
{
|
|
str << "(! ";
|
|
e->show(symbols, str);
|
|
str << ")";
|
|
}
|
|
|
|
void ExprConcatStrings::show(const SymbolTable & symbols, std::ostream & str) const
|
|
{
|
|
bool first = true;
|
|
str << "(";
|
|
for (auto & i : *es) {
|
|
if (first) first = false; else str << " + ";
|
|
i.second->show(symbols, str);
|
|
}
|
|
str << ")";
|
|
}
|
|
|
|
void ExprPos::show(const SymbolTable & symbols, std::ostream & str) const
|
|
{
|
|
str << "__curPos";
|
|
}
|
|
|
|
|
|
std::ostream & operator << (std::ostream & str, const Pos & pos)
|
|
{
|
|
if (!pos)
|
|
str << "undefined position";
|
|
else
|
|
{
|
|
auto f = format(ANSI_BOLD "%1%" ANSI_NORMAL ":%2%:%3%");
|
|
switch (pos.origin) {
|
|
case foFile:
|
|
f % (const std::string &) pos.file;
|
|
break;
|
|
case foStdin:
|
|
case foString:
|
|
f % "(string)";
|
|
break;
|
|
default:
|
|
throw Error("unhandled Pos origin!");
|
|
}
|
|
str << (f % pos.line % pos.column).str();
|
|
}
|
|
|
|
return str;
|
|
}
|
|
|
|
|
|
std::string showAttrPath(const SymbolTable & symbols, const AttrPath & attrPath)
|
|
{
|
|
std::ostringstream out;
|
|
bool first = true;
|
|
for (auto & i : attrPath) {
|
|
if (!first) out << '.'; else first = false;
|
|
if (i.symbol)
|
|
out << symbols[i.symbol];
|
|
else {
|
|
out << "\"${";
|
|
i.expr->show(symbols, out);
|
|
out << "}\"";
|
|
}
|
|
}
|
|
return out.str();
|
|
}
|
|
|
|
|
|
|
|
/* Computing levels/displacements for variables. */
|
|
|
|
void Expr::bindVars(EvalState & es, const std::shared_ptr<const StaticEnv> & env)
|
|
{
|
|
abort();
|
|
}
|
|
|
|
void ExprInt::bindVars(EvalState & es, const std::shared_ptr<const StaticEnv> & env)
|
|
{
|
|
if (debuggerHook)
|
|
es.exprEnvs.insert(std::make_pair(this, env));
|
|
}
|
|
|
|
void ExprFloat::bindVars(EvalState & es, const std::shared_ptr<const StaticEnv> & env)
|
|
{
|
|
if (debuggerHook)
|
|
es.exprEnvs.insert(std::make_pair(this, env));
|
|
}
|
|
|
|
void ExprString::bindVars(EvalState & es, const std::shared_ptr<const StaticEnv> & env)
|
|
{
|
|
if (debuggerHook)
|
|
es.exprEnvs.insert(std::make_pair(this, env));
|
|
}
|
|
|
|
void ExprPath::bindVars(EvalState & es, const std::shared_ptr<const StaticEnv> & env)
|
|
{
|
|
if (debuggerHook)
|
|
es.exprEnvs.insert(std::make_pair(this, env));
|
|
}
|
|
|
|
void ExprVar::bindVars(EvalState & es, const std::shared_ptr<const StaticEnv> & env)
|
|
{
|
|
if (debuggerHook)
|
|
es.exprEnvs.insert(std::make_pair(this, env));
|
|
|
|
/* Check whether the variable appears in the environment. If so,
|
|
set its level and displacement. */
|
|
const StaticEnv * curEnv;
|
|
Level level;
|
|
int withLevel = -1;
|
|
for (curEnv = env.get(), level = 0; curEnv; curEnv = curEnv->up, level++) {
|
|
if (curEnv->isWith) {
|
|
if (withLevel == -1) withLevel = level;
|
|
} else {
|
|
auto i = curEnv->find(name);
|
|
if (i != curEnv->vars.end()) {
|
|
fromWith = false;
|
|
this->level = level;
|
|
displ = i->second;
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Otherwise, the variable must be obtained from the nearest
|
|
enclosing `with'. If there is no `with', then we can issue an
|
|
"undefined variable" error now. */
|
|
if (withLevel == -1)
|
|
throw UndefinedVarError({
|
|
.msg = hintfmt("undefined variable '%1%'", es.symbols[name]),
|
|
.errPos = es.positions[pos]
|
|
});
|
|
fromWith = true;
|
|
this->level = withLevel;
|
|
}
|
|
|
|
void ExprSelect::bindVars(EvalState & es, const std::shared_ptr<const StaticEnv> & env)
|
|
{
|
|
if (debuggerHook)
|
|
es.exprEnvs.insert(std::make_pair(this, env));
|
|
|
|
e->bindVars(es, env);
|
|
if (def) def->bindVars(es, env);
|
|
for (auto & i : attrPath)
|
|
if (!i.symbol)
|
|
i.expr->bindVars(es, env);
|
|
}
|
|
|
|
void ExprOpHasAttr::bindVars(EvalState & es, const std::shared_ptr<const StaticEnv> & env)
|
|
{
|
|
if (debuggerHook)
|
|
es.exprEnvs.insert(std::make_pair(this, env));
|
|
|
|
e->bindVars(es, env);
|
|
for (auto & i : attrPath)
|
|
if (!i.symbol)
|
|
i.expr->bindVars(es, env);
|
|
}
|
|
|
|
void ExprAttrs::bindVars(EvalState & es, const std::shared_ptr<const StaticEnv> & env)
|
|
{
|
|
if (debuggerHook)
|
|
es.exprEnvs.insert(std::make_pair(this, env));
|
|
|
|
if (recursive) {
|
|
auto newEnv = std::make_shared<StaticEnv>(false, env.get(), recursive ? attrs.size() : 0);
|
|
|
|
Displacement displ = 0;
|
|
for (auto & i : attrs)
|
|
newEnv->vars.emplace_back(i.first, i.second.displ = displ++);
|
|
|
|
// No need to sort newEnv since attrs is in sorted order.
|
|
|
|
for (auto & i : attrs)
|
|
i.second.e->bindVars(es, i.second.inherited ? env : newEnv);
|
|
|
|
for (auto & i : dynamicAttrs) {
|
|
i.nameExpr->bindVars(es, newEnv);
|
|
i.valueExpr->bindVars(es, newEnv);
|
|
}
|
|
}
|
|
else {
|
|
for (auto & i : attrs)
|
|
i.second.e->bindVars(es, env);
|
|
|
|
for (auto & i : dynamicAttrs) {
|
|
i.nameExpr->bindVars(es, env);
|
|
i.valueExpr->bindVars(es, env);
|
|
}
|
|
}
|
|
}
|
|
|
|
void ExprList::bindVars(EvalState & es, const std::shared_ptr<const StaticEnv> & env)
|
|
{
|
|
if (debuggerHook)
|
|
es.exprEnvs.insert(std::make_pair(this, env));
|
|
|
|
for (auto & i : elems)
|
|
i->bindVars(es, env);
|
|
}
|
|
|
|
void ExprLambda::bindVars(EvalState & es, const std::shared_ptr<const StaticEnv> & env)
|
|
{
|
|
if (debuggerHook)
|
|
es.exprEnvs.insert(std::make_pair(this, env));
|
|
|
|
auto newEnv = std::make_shared<StaticEnv>(
|
|
false, env.get(),
|
|
(hasFormals() ? formals->formals.size() : 0) +
|
|
(!arg ? 0 : 1));
|
|
|
|
Displacement displ = 0;
|
|
|
|
if (arg) newEnv->vars.emplace_back(arg, displ++);
|
|
|
|
if (hasFormals()) {
|
|
for (auto & i : formals->formals)
|
|
newEnv->vars.emplace_back(i.name, displ++);
|
|
|
|
newEnv->sort();
|
|
|
|
for (auto & i : formals->formals)
|
|
if (i.def) i.def->bindVars(es, newEnv);
|
|
}
|
|
|
|
body->bindVars(es, newEnv);
|
|
}
|
|
|
|
void ExprCall::bindVars(EvalState & es, const std::shared_ptr<const StaticEnv> & env)
|
|
{
|
|
if (debuggerHook)
|
|
es.exprEnvs.insert(std::make_pair(this, env));
|
|
|
|
fun->bindVars(es, env);
|
|
for (auto e : args)
|
|
e->bindVars(es, env);
|
|
}
|
|
|
|
void ExprLet::bindVars(EvalState & es, const std::shared_ptr<const StaticEnv> & env)
|
|
{
|
|
if (debuggerHook)
|
|
es.exprEnvs.insert(std::make_pair(this, env));
|
|
|
|
auto newEnv = std::make_shared<StaticEnv>(false, env.get(), attrs->attrs.size());
|
|
|
|
Displacement displ = 0;
|
|
for (auto & i : attrs->attrs)
|
|
newEnv->vars.emplace_back(i.first, i.second.displ = displ++);
|
|
|
|
// No need to sort newEnv since attrs->attrs is in sorted order.
|
|
|
|
for (auto & i : attrs->attrs)
|
|
i.second.e->bindVars(es, i.second.inherited ? env : newEnv);
|
|
|
|
body->bindVars(es, newEnv);
|
|
}
|
|
|
|
void ExprWith::bindVars(EvalState & es, const std::shared_ptr<const StaticEnv> & env)
|
|
{
|
|
if (debuggerHook)
|
|
es.exprEnvs.insert(std::make_pair(this, env));
|
|
|
|
/* Does this `with' have an enclosing `with'? If so, record its
|
|
level so that `lookupVar' can look up variables in the previous
|
|
`with' if this one doesn't contain the desired attribute. */
|
|
const StaticEnv * curEnv;
|
|
Level level;
|
|
prevWith = 0;
|
|
for (curEnv = env.get(), level = 1; curEnv; curEnv = curEnv->up, level++)
|
|
if (curEnv->isWith) {
|
|
prevWith = level;
|
|
break;
|
|
}
|
|
|
|
if (debuggerHook)
|
|
es.exprEnvs.insert(std::make_pair(this, env));
|
|
|
|
attrs->bindVars(es, env);
|
|
auto newEnv = std::make_shared<StaticEnv>(true, env.get());
|
|
body->bindVars(es, newEnv);
|
|
}
|
|
|
|
void ExprIf::bindVars(EvalState & es, const std::shared_ptr<const StaticEnv> & env)
|
|
{
|
|
if (debuggerHook)
|
|
es.exprEnvs.insert(std::make_pair(this, env));
|
|
|
|
cond->bindVars(es, env);
|
|
then->bindVars(es, env);
|
|
else_->bindVars(es, env);
|
|
}
|
|
|
|
void ExprAssert::bindVars(EvalState & es, const std::shared_ptr<const StaticEnv> & env)
|
|
{
|
|
if (debuggerHook)
|
|
es.exprEnvs.insert(std::make_pair(this, env));
|
|
|
|
cond->bindVars(es, env);
|
|
body->bindVars(es, env);
|
|
}
|
|
|
|
void ExprOpNot::bindVars(EvalState & es, const std::shared_ptr<const StaticEnv> & env)
|
|
{
|
|
if (debuggerHook)
|
|
es.exprEnvs.insert(std::make_pair(this, env));
|
|
|
|
e->bindVars(es, env);
|
|
}
|
|
|
|
void ExprConcatStrings::bindVars(EvalState & es, const std::shared_ptr<const StaticEnv> & env)
|
|
{
|
|
if (debuggerHook)
|
|
es.exprEnvs.insert(std::make_pair(this, env));
|
|
|
|
for (auto & i : *this->es)
|
|
i.second->bindVars(es, env);
|
|
}
|
|
|
|
void ExprPos::bindVars(EvalState & es, const std::shared_ptr<const StaticEnv> & env)
|
|
{
|
|
if (debuggerHook)
|
|
es.exprEnvs.insert(std::make_pair(this, env));
|
|
}
|
|
|
|
|
|
/* Storing function names. */
|
|
|
|
void Expr::setName(Symbol name)
|
|
{
|
|
}
|
|
|
|
|
|
void ExprLambda::setName(Symbol name)
|
|
{
|
|
this->name = name;
|
|
body->setName(name);
|
|
}
|
|
|
|
|
|
std::string ExprLambda::showNamePos(const EvalState & state) const
|
|
{
|
|
std::string id(name
|
|
? concatStrings("'", state.symbols[name], "'")
|
|
: "anonymous function");
|
|
return fmt("%1% at %2%", id, state.positions[pos]);
|
|
}
|
|
|
|
|
|
|
|
/* Symbol table. */
|
|
|
|
size_t SymbolTable::totalSize() const
|
|
{
|
|
size_t n = 0;
|
|
dump([&] (const std::string & s) { n += s.size(); });
|
|
return n;
|
|
}
|
|
|
|
}
|