1048 lines
27 KiB
C++
1048 lines
27 KiB
C++
#include "eval.hh"
|
|
#include "parser.hh"
|
|
#include "hash.hh"
|
|
#include "util.hh"
|
|
#include "store-api.hh"
|
|
#include "derivations.hh"
|
|
#include "globals.hh"
|
|
|
|
#include <cstring>
|
|
|
|
|
|
#define LocalNoInline(f) static f __attribute__((noinline)); f
|
|
#define LocalNoInlineNoReturn(f) static f __attribute__((noinline, noreturn)); f
|
|
|
|
|
|
namespace nix {
|
|
|
|
|
|
std::ostream & operator << (std::ostream & str, Value & v)
|
|
{
|
|
switch (v.type) {
|
|
case tInt:
|
|
str << v.integer;
|
|
break;
|
|
case tBool:
|
|
str << (v.boolean ? "true" : "false");
|
|
break;
|
|
case tString:
|
|
str << "\"";
|
|
for (const char * i = v.string.s; *i; i++)
|
|
if (*i == '\"' || *i == '\\') str << "\\" << *i;
|
|
else if (*i == '\n') str << "\\n";
|
|
else if (*i == '\r') str << "\\r";
|
|
else if (*i == '\t') str << "\\t";
|
|
else str << *i;
|
|
str << "\"";
|
|
break;
|
|
case tPath:
|
|
str << v.path; // !!! escaping?
|
|
break;
|
|
case tNull:
|
|
str << "true";
|
|
break;
|
|
case tAttrs:
|
|
str << "{ ";
|
|
foreach (Bindings::iterator, i, *v.attrs)
|
|
str << (string) i->first << " = " << i->second << "; ";
|
|
str << "}";
|
|
break;
|
|
case tList:
|
|
str << "[ ";
|
|
for (unsigned int n = 0; n < v.list.length; ++n)
|
|
str << v.list.elems[n] << " ";
|
|
str << "]";
|
|
break;
|
|
case tThunk:
|
|
case tCopy:
|
|
str << "<CODE>";
|
|
break;
|
|
case tLambda:
|
|
str << "<LAMBDA>";
|
|
break;
|
|
case tPrimOp:
|
|
str << "<PRIMOP>";
|
|
break;
|
|
case tPrimOpApp:
|
|
str << "<PRIMOP-APP>";
|
|
break;
|
|
default:
|
|
throw Error("invalid value");
|
|
}
|
|
return str;
|
|
}
|
|
|
|
|
|
string showType(Value & v)
|
|
{
|
|
switch (v.type) {
|
|
case tInt: return "an integer";
|
|
case tBool: return "a boolean";
|
|
case tString: return "a string";
|
|
case tPath: return "a path";
|
|
case tAttrs: return "an attribute set";
|
|
case tList: return "a list";
|
|
case tNull: return "null";
|
|
case tLambda: return "a function";
|
|
case tPrimOp: return "a built-in function";
|
|
case tPrimOpApp: return "a partially applied built-in function";
|
|
default: throw Error(format("unknown type: %1%") % v.type);
|
|
}
|
|
}
|
|
|
|
|
|
EvalState::EvalState()
|
|
: sWith(symbols.create("<with>"))
|
|
, sOutPath(symbols.create("outPath"))
|
|
, sDrvPath(symbols.create("drvPath"))
|
|
, sType(symbols.create("type"))
|
|
, sMeta(symbols.create("meta"))
|
|
, sName(symbols.create("name"))
|
|
, baseEnv(allocEnv(128))
|
|
, baseEnvDispl(0)
|
|
, staticBaseEnv(false, 0)
|
|
{
|
|
nrValues = nrEnvs = nrEvaluated = recursionDepth = maxRecursionDepth = 0;
|
|
deepestStack = (char *) -1;
|
|
|
|
createBaseEnv();
|
|
|
|
allowUnsafeEquality = getEnv("NIX_NO_UNSAFE_EQ", "") == "";
|
|
}
|
|
|
|
|
|
EvalState::~EvalState()
|
|
{
|
|
assert(recursionDepth == 0);
|
|
}
|
|
|
|
|
|
void EvalState::addConstant(const string & name, Value & v)
|
|
{
|
|
staticBaseEnv.vars[symbols.create(name)] = baseEnvDispl;
|
|
baseEnv.values[baseEnvDispl++] = v;
|
|
string name2 = string(name, 0, 2) == "__" ? string(name, 2) : name;
|
|
(*baseEnv.values[0].attrs)[symbols.create(name2)] = v;
|
|
}
|
|
|
|
|
|
void EvalState::addPrimOp(const string & name,
|
|
unsigned int arity, PrimOp primOp)
|
|
{
|
|
Value v;
|
|
v.type = tPrimOp;
|
|
v.primOp.arity = arity;
|
|
v.primOp.fun = primOp;
|
|
staticBaseEnv.vars[symbols.create(name)] = baseEnvDispl;
|
|
baseEnv.values[baseEnvDispl++] = v;
|
|
string name2 = string(name, 0, 2) == "__" ? string(name, 2) : name;
|
|
(*baseEnv.values[0].attrs)[symbols.create(name2)] = v;
|
|
}
|
|
|
|
|
|
/* Every "format" object (even temporary) takes up a few hundred bytes
|
|
of stack space, which is a real killer in the recursive
|
|
evaluator. So here are some helper functions for throwing
|
|
exceptions. */
|
|
|
|
LocalNoInlineNoReturn(void throwEvalError(const char * s))
|
|
{
|
|
throw EvalError(s);
|
|
}
|
|
|
|
LocalNoInlineNoReturn(void throwEvalError(const char * s, const string & s2))
|
|
{
|
|
throw EvalError(format(s) % s2);
|
|
}
|
|
|
|
LocalNoInlineNoReturn(void throwEvalError(const char * s, const string & s2, const string & s3))
|
|
{
|
|
throw EvalError(format(s) % s2 % s3);
|
|
}
|
|
|
|
LocalNoInlineNoReturn(void throwTypeError(const char * s))
|
|
{
|
|
throw TypeError(s);
|
|
}
|
|
|
|
LocalNoInlineNoReturn(void throwTypeError(const char * s, const string & s2))
|
|
{
|
|
throw TypeError(format(s) % s2);
|
|
}
|
|
|
|
LocalNoInlineNoReturn(void throwTypeError(const char * s, const Pos & pos, const string & s2))
|
|
{
|
|
throw TypeError(format(s) % pos % s2);
|
|
}
|
|
|
|
LocalNoInlineNoReturn(void throwTypeError(const char * s, const Pos & pos))
|
|
{
|
|
throw TypeError(format(s) % pos);
|
|
}
|
|
|
|
LocalNoInlineNoReturn(void throwAssertionError(const char * s, const Pos & pos))
|
|
{
|
|
throw AssertionError(format(s) % pos);
|
|
}
|
|
|
|
LocalNoInline(void addErrorPrefix(Error & e, const char * s))
|
|
{
|
|
e.addPrefix(s);
|
|
}
|
|
|
|
LocalNoInline(void addErrorPrefix(Error & e, const char * s, const string & s2))
|
|
{
|
|
e.addPrefix(format(s) % s2);
|
|
}
|
|
|
|
LocalNoInline(void addErrorPrefix(Error & e, const char * s, const Pos & pos))
|
|
{
|
|
e.addPrefix(format(s) % pos);
|
|
}
|
|
|
|
LocalNoInline(void addErrorPrefix(Error & e, const char * s, const string & s2, const string & s3))
|
|
{
|
|
e.addPrefix(format(s) % s2 % s3);
|
|
}
|
|
|
|
|
|
void mkString(Value & v, const char * s)
|
|
{
|
|
v.type = tString;
|
|
v.string.s = strdup(s);
|
|
v.string.context = 0;
|
|
}
|
|
|
|
|
|
void mkString(Value & v, const string & s, const PathSet & context)
|
|
{
|
|
mkString(v, s.c_str());
|
|
if (!context.empty()) {
|
|
unsigned int n = 0;
|
|
v.string.context = new const char *[context.size() + 1];
|
|
foreach (PathSet::const_iterator, i, context)
|
|
v.string.context[n++] = strdup(i->c_str());
|
|
v.string.context[n] = 0;
|
|
}
|
|
}
|
|
|
|
|
|
void mkPath(Value & v, const char * s)
|
|
{
|
|
v.type = tPath;
|
|
v.path = strdup(s);
|
|
}
|
|
|
|
|
|
Value * EvalState::lookupVar(Env * env, const VarRef & var)
|
|
{
|
|
for (unsigned int l = var.level; l; --l, env = env->up) ;
|
|
|
|
if (var.fromWith) {
|
|
Bindings::iterator j = env->values[0].attrs->find(var.name);
|
|
if (j == env->values[0].attrs->end())
|
|
throwEvalError("undefined variable `%1%'", var.name);
|
|
return &j->second;
|
|
} else
|
|
return &env->values[var.displ];
|
|
}
|
|
|
|
|
|
Value * EvalState::allocValues(unsigned int count)
|
|
{
|
|
nrValues += count;
|
|
return new Value[count]; // !!! check destructor
|
|
}
|
|
|
|
|
|
Env & EvalState::allocEnv(unsigned int size)
|
|
{
|
|
nrEnvs++;
|
|
Env * env = (Env *) malloc(sizeof(Env) + size * sizeof(Value));
|
|
return *env;
|
|
}
|
|
|
|
|
|
void EvalState::mkList(Value & v, unsigned int length)
|
|
{
|
|
v.type = tList;
|
|
v.list.length = length;
|
|
v.list.elems = allocValues(length);
|
|
}
|
|
|
|
|
|
void EvalState::mkAttrs(Value & v)
|
|
{
|
|
v.type = tAttrs;
|
|
v.attrs = new Bindings;
|
|
}
|
|
|
|
|
|
void EvalState::mkThunk_(Value & v, Expr * expr)
|
|
{
|
|
mkThunk(v, baseEnv, expr);
|
|
}
|
|
|
|
|
|
void EvalState::cloneAttrs(Value & src, Value & dst)
|
|
{
|
|
mkAttrs(dst);
|
|
foreach (Bindings::iterator, i, *src.attrs)
|
|
mkCopy((*dst.attrs)[i->first], i->second);
|
|
}
|
|
|
|
|
|
void EvalState::evalFile(const Path & path, Value & v)
|
|
{
|
|
startNest(nest, lvlTalkative, format("evaluating file `%1%'") % path);
|
|
|
|
Expr * e = parseTrees[path];
|
|
|
|
if (!e) {
|
|
e = parseExprFromFile(*this, path);
|
|
parseTrees[path] = e;
|
|
}
|
|
|
|
try {
|
|
eval(e, v);
|
|
} catch (Error & e) {
|
|
addErrorPrefix(e, "while evaluating the file `%1%':\n", path);
|
|
throw;
|
|
}
|
|
}
|
|
|
|
|
|
struct RecursionCounter
|
|
{
|
|
EvalState & state;
|
|
RecursionCounter(EvalState & state) : state(state)
|
|
{
|
|
state.recursionDepth++;
|
|
if (state.recursionDepth > state.maxRecursionDepth)
|
|
state.maxRecursionDepth = state.recursionDepth;
|
|
}
|
|
~RecursionCounter()
|
|
{
|
|
state.recursionDepth--;
|
|
}
|
|
};
|
|
|
|
|
|
void EvalState::eval(Env & env, Expr * e, Value & v)
|
|
{
|
|
/* When changing this function, make sure that you don't cause a
|
|
(large) increase in stack consumption! */
|
|
|
|
/* !!! Disable this eventually. */
|
|
RecursionCounter r(*this);
|
|
char x;
|
|
if (&x < deepestStack) deepestStack = &x;
|
|
|
|
//debug(format("eval: %1%") % *e);
|
|
|
|
checkInterrupt();
|
|
|
|
nrEvaluated++;
|
|
|
|
e->eval(*this, env, v);
|
|
}
|
|
|
|
|
|
void EvalState::eval(Expr * e, Value & v)
|
|
{
|
|
eval(baseEnv, e, v);
|
|
}
|
|
|
|
|
|
bool EvalState::evalBool(Env & env, Expr * e)
|
|
{
|
|
Value v;
|
|
eval(env, e, v);
|
|
if (v.type != tBool)
|
|
throwTypeError("value is %1% while a Boolean was expected", showType(v));
|
|
return v.boolean;
|
|
}
|
|
|
|
|
|
void Expr::eval(EvalState & state, Env & env, Value & v)
|
|
{
|
|
abort();
|
|
}
|
|
|
|
|
|
void ExprInt::eval(EvalState & state, Env & env, Value & v)
|
|
{
|
|
mkInt(v, n);
|
|
}
|
|
|
|
|
|
void ExprString::eval(EvalState & state, Env & env, Value & v)
|
|
{
|
|
mkString(v, s.c_str());
|
|
}
|
|
|
|
|
|
void ExprPath::eval(EvalState & state, Env & env, Value & v)
|
|
{
|
|
mkPath(v, s.c_str());
|
|
}
|
|
|
|
|
|
void ExprAttrs::eval(EvalState & state, Env & env, Value & v)
|
|
{
|
|
state.mkAttrs(v);
|
|
|
|
if (recursive) {
|
|
/* Create a new environment that contains the attributes in
|
|
this `rec'. */
|
|
Env & env2(state.allocEnv(attrs.size() + inherited.size()));
|
|
env2.up = &env;
|
|
|
|
unsigned int displ = 0;
|
|
|
|
/* The recursive attributes are evaluated in the new
|
|
environment. */
|
|
foreach (Attrs::iterator, i, attrs) {
|
|
Value & v2 = (*v.attrs)[i->first];
|
|
mkCopy(v2, env2.values[displ]);
|
|
mkThunk(env2.values[displ++], env2, i->second);
|
|
}
|
|
|
|
/* The inherited attributes, on the other hand, are
|
|
evaluated in the original environment. */
|
|
foreach (list<VarRef>::iterator, i, inherited) {
|
|
Value & v2 = (*v.attrs)[i->name];
|
|
Value * v3 = state.lookupVar(&env, *i);
|
|
mkCopy(v2, *v3);
|
|
mkCopy(env2.values[displ++], *v3);
|
|
}
|
|
|
|
}
|
|
|
|
else {
|
|
foreach (Attrs::iterator, i, attrs) {
|
|
Value & v2 = (*v.attrs)[i->first];
|
|
mkThunk(v2, env, i->second);
|
|
}
|
|
|
|
foreach (list<VarRef>::iterator, i, inherited) {
|
|
Value & v2 = (*v.attrs)[i->name];
|
|
mkCopy(v2, *state.lookupVar(&env, *i));
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
void ExprLet::eval(EvalState & state, Env & env, Value & v)
|
|
{
|
|
/* Create a new environment that contains the attributes in this
|
|
`let'. */
|
|
Env & env2(state.allocEnv(attrs->attrs.size() + attrs->inherited.size()));
|
|
env2.up = &env;
|
|
|
|
unsigned int displ = 0;
|
|
|
|
/* The recursive attributes are evaluated in the new
|
|
environment. */
|
|
foreach (ExprAttrs::Attrs::iterator, i, attrs->attrs)
|
|
mkThunk(env2.values[displ++], env2, i->second);
|
|
|
|
/* The inherited attributes, on the other hand, are evaluated in
|
|
the original environment. */
|
|
foreach (list<VarRef>::iterator, i, attrs->inherited)
|
|
mkCopy(env2.values[displ++], *state.lookupVar(&env, *i));
|
|
|
|
state.eval(env2, body, v);
|
|
}
|
|
|
|
|
|
void ExprList::eval(EvalState & state, Env & env, Value & v)
|
|
{
|
|
state.mkList(v, elems.size());
|
|
for (unsigned int n = 0; n < v.list.length; ++n)
|
|
mkThunk(v.list.elems[n], env, elems[n]);
|
|
}
|
|
|
|
|
|
void ExprVar::eval(EvalState & state, Env & env, Value & v)
|
|
{
|
|
Value * v2 = state.lookupVar(&env, info);
|
|
state.forceValue(*v2);
|
|
v = *v2;
|
|
}
|
|
|
|
|
|
void ExprSelect::eval(EvalState & state, Env & env, Value & v)
|
|
{
|
|
Value v2;
|
|
state.eval(env, e, v2);
|
|
state.forceAttrs(v2); // !!! eval followed by force is slightly inefficient
|
|
Bindings::iterator i = v2.attrs->find(name);
|
|
if (i == v2.attrs->end())
|
|
throwEvalError("attribute `%1%' missing", name);
|
|
try {
|
|
state.forceValue(i->second);
|
|
} catch (Error & e) {
|
|
addErrorPrefix(e, "while evaluating the attribute `%1%':\n", name);
|
|
throw;
|
|
}
|
|
v = i->second;
|
|
}
|
|
|
|
|
|
void ExprOpHasAttr::eval(EvalState & state, Env & env, Value & v)
|
|
{
|
|
Value vAttrs;
|
|
state.eval(env, e, vAttrs);
|
|
state.forceAttrs(vAttrs);
|
|
mkBool(v, vAttrs.attrs->find(name) != vAttrs.attrs->end());
|
|
}
|
|
|
|
|
|
void ExprLambda::eval(EvalState & state, Env & env, Value & v)
|
|
{
|
|
v.type = tLambda;
|
|
v.lambda.env = &env;
|
|
v.lambda.fun = this;
|
|
}
|
|
|
|
|
|
void ExprApp::eval(EvalState & state, Env & env, Value & v)
|
|
{
|
|
Value vFun;
|
|
state.eval(env, e1, vFun);
|
|
Value vArg;
|
|
mkThunk(vArg, env, e2); // !!! should this be on the heap?
|
|
state.callFunction(vFun, vArg, v);
|
|
}
|
|
|
|
|
|
void EvalState::callFunction(Value & fun, Value & arg, Value & v)
|
|
{
|
|
if (fun.type == tPrimOp || fun.type == tPrimOpApp) {
|
|
unsigned int argsLeft =
|
|
fun.type == tPrimOp ? fun.primOp.arity : fun.primOpApp.argsLeft;
|
|
if (argsLeft == 1) {
|
|
/* We have all the arguments, so call the primop. First
|
|
find the primop. */
|
|
Value * primOp = &fun;
|
|
while (primOp->type == tPrimOpApp) primOp = primOp->primOpApp.left;
|
|
assert(primOp->type == tPrimOp);
|
|
unsigned int arity = primOp->primOp.arity;
|
|
|
|
/* Put all the arguments in an array. */
|
|
Value * vArgs[arity];
|
|
unsigned int n = arity - 1;
|
|
vArgs[n--] = &arg;
|
|
for (Value * arg = &fun; arg->type == tPrimOpApp; arg = arg->primOpApp.left)
|
|
vArgs[n--] = arg->primOpApp.right;
|
|
|
|
/* And call the primop. */
|
|
primOp->primOp.fun(*this, vArgs, v);
|
|
} else {
|
|
Value * v2 = allocValues(2);
|
|
v2[0] = fun;
|
|
v2[1] = arg;
|
|
v.type = tPrimOpApp;
|
|
v.primOpApp.left = &v2[0];
|
|
v.primOpApp.right = &v2[1];
|
|
v.primOpApp.argsLeft = argsLeft - 1;
|
|
}
|
|
return;
|
|
}
|
|
|
|
if (fun.type != tLambda)
|
|
throwTypeError("attempt to call something which is neither a function nor a primop (built-in operation) but %1%",
|
|
showType(fun));
|
|
|
|
unsigned int size =
|
|
(fun.lambda.fun->arg.empty() ? 0 : 1) +
|
|
(fun.lambda.fun->matchAttrs ? fun.lambda.fun->formals->formals.size() : 0);
|
|
Env & env2(allocEnv(size));
|
|
env2.up = fun.lambda.env;
|
|
|
|
unsigned int displ = 0;
|
|
|
|
if (!fun.lambda.fun->matchAttrs)
|
|
env2.values[displ++] = arg;
|
|
|
|
else {
|
|
forceAttrs(arg);
|
|
|
|
if (!fun.lambda.fun->arg.empty())
|
|
env2.values[displ++] = arg;
|
|
|
|
/* For each formal argument, get the actual argument. If
|
|
there is no matching actual argument but the formal
|
|
argument has a default, use the default. */
|
|
unsigned int attrsUsed = 0;
|
|
foreach (Formals::Formals_::iterator, i, fun.lambda.fun->formals->formals) {
|
|
Bindings::iterator j = arg.attrs->find(i->name);
|
|
if (j == arg.attrs->end()) {
|
|
if (!i->def) throwTypeError("function at %1% called without required argument `%2%'",
|
|
fun.lambda.fun->pos, i->name);
|
|
mkThunk(env2.values[displ++], env2, i->def);
|
|
} else {
|
|
attrsUsed++;
|
|
mkCopy(env2.values[displ++], j->second);
|
|
}
|
|
}
|
|
|
|
/* Check that each actual argument is listed as a formal
|
|
argument (unless the attribute match specifies a `...').
|
|
TODO: show the names of the expected/unexpected
|
|
arguments. */
|
|
if (!fun.lambda.fun->formals->ellipsis && attrsUsed != arg.attrs->size())
|
|
throwTypeError("function at %1% called with unexpected argument", fun.lambda.fun->pos);
|
|
}
|
|
|
|
try {
|
|
eval(env2, fun.lambda.fun->body, v);
|
|
} catch (Error & e) {
|
|
addErrorPrefix(e, "while evaluating the function at %1%:\n", fun.lambda.fun->pos);
|
|
throw;
|
|
}
|
|
}
|
|
|
|
|
|
void EvalState::autoCallFunction(const Bindings & args, Value & fun, Value & res)
|
|
{
|
|
forceValue(fun);
|
|
|
|
if (fun.type != tLambda || !fun.lambda.fun->matchAttrs) {
|
|
res = fun;
|
|
return;
|
|
}
|
|
|
|
Value actualArgs;
|
|
mkAttrs(actualArgs);
|
|
|
|
foreach (Formals::Formals_::iterator, i, fun.lambda.fun->formals->formals) {
|
|
Bindings::const_iterator j = args.find(i->name);
|
|
if (j != args.end())
|
|
(*actualArgs.attrs)[i->name] = j->second;
|
|
else if (!i->def)
|
|
throwTypeError("cannot auto-call a function that has an argument without a default value (`%1%')", i->name);
|
|
}
|
|
|
|
callFunction(fun, actualArgs, res);
|
|
}
|
|
|
|
|
|
void ExprWith::eval(EvalState & state, Env & env, Value & v)
|
|
{
|
|
Env & env2(state.allocEnv(1));
|
|
env2.up = &env;
|
|
|
|
state.eval(env, attrs, env2.values[0]);
|
|
state.forceAttrs(env2.values[0]);
|
|
|
|
/* If there is an enclosing `with', copy all attributes that don't
|
|
appear in this `with'. */
|
|
if (prevWith != -1) {
|
|
Env * env3 = &env;
|
|
for (unsigned int l = prevWith; l; --l, env3 = env3->up) ;
|
|
|
|
foreach (Bindings::iterator, i, *env3->values[0].attrs) {
|
|
Bindings::iterator j = env2.values[0].attrs->find(i->first);
|
|
if (j == env2.values[0].attrs->end())
|
|
(*env2.values[0].attrs)[i->first] = i->second; // !!! sharing
|
|
}
|
|
}
|
|
|
|
state.eval(env2, body, v);
|
|
}
|
|
|
|
|
|
void ExprIf::eval(EvalState & state, Env & env, Value & v)
|
|
{
|
|
state.eval(env, state.evalBool(env, cond) ? then : else_, v);
|
|
}
|
|
|
|
|
|
void ExprAssert::eval(EvalState & state, Env & env, Value & v)
|
|
{
|
|
if (!state.evalBool(env, cond))
|
|
throwAssertionError("assertion failed at %1%", pos);
|
|
state.eval(env, body, v);
|
|
}
|
|
|
|
|
|
void ExprOpNot::eval(EvalState & state, Env & env, Value & v)
|
|
{
|
|
mkBool(v, !state.evalBool(env, e));
|
|
}
|
|
|
|
|
|
void ExprOpEq::eval(EvalState & state, Env & env, Value & v)
|
|
{
|
|
Value v1; state.eval(env, e1, v1);
|
|
Value v2; state.eval(env, e2, v2);
|
|
mkBool(v, state.eqValues(v1, v2));
|
|
}
|
|
|
|
|
|
void ExprOpNEq::eval(EvalState & state, Env & env, Value & v)
|
|
{
|
|
Value v1; state.eval(env, e1, v1);
|
|
Value v2; state.eval(env, e2, v2);
|
|
mkBool(v, !state.eqValues(v1, v2));
|
|
}
|
|
|
|
|
|
void ExprOpAnd::eval(EvalState & state, Env & env, Value & v)
|
|
{
|
|
mkBool(v, state.evalBool(env, e1) && state.evalBool(env, e2));
|
|
}
|
|
|
|
|
|
void ExprOpOr::eval(EvalState & state, Env & env, Value & v)
|
|
{
|
|
mkBool(v, state.evalBool(env, e1) || state.evalBool(env, e2));
|
|
}
|
|
|
|
|
|
void ExprOpImpl::eval(EvalState & state, Env & env, Value & v)
|
|
{
|
|
mkBool(v, !state.evalBool(env, e1) || state.evalBool(env, e2));
|
|
}
|
|
|
|
|
|
void ExprOpUpdate::eval(EvalState & state, Env & env, Value & v)
|
|
{
|
|
Value v2;
|
|
state.eval(env, e1, v2);
|
|
state.forceAttrs(v2);
|
|
|
|
state.cloneAttrs(v2, v);
|
|
|
|
state.eval(env, e2, v2);
|
|
state.forceAttrs(v2);
|
|
|
|
foreach (Bindings::iterator, i, *v2.attrs)
|
|
(*v.attrs)[i->first] = i->second; // !!! sharing
|
|
}
|
|
|
|
|
|
void ExprOpConcatLists::eval(EvalState & state, Env & env, Value & v)
|
|
{
|
|
Value v1; state.eval(env, e1, v1);
|
|
state.forceList(v1);
|
|
Value v2; state.eval(env, e2, v2);
|
|
state.forceList(v2);
|
|
state.mkList(v, v1.list.length + v2.list.length);
|
|
/* !!! This loses sharing with the original lists. We could use a
|
|
tCopy node, but that would use more memory. */
|
|
for (unsigned int n = 0; n < v1.list.length; ++n)
|
|
v.list.elems[n] = v1.list.elems[n];
|
|
for (unsigned int n = 0; n < v2.list.length; ++n)
|
|
v.list.elems[n + v1.list.length] = v2.list.elems[n];
|
|
}
|
|
|
|
|
|
void ExprConcatStrings::eval(EvalState & state, Env & env, Value & v)
|
|
{
|
|
PathSet context;
|
|
std::ostringstream s;
|
|
|
|
bool first = true, isPath = false;
|
|
Value vStr;
|
|
|
|
foreach (vector<Expr *>::iterator, i, *es) {
|
|
state.eval(env, *i, vStr);
|
|
|
|
/* If the first element is a path, then the result will also
|
|
be a path, we don't copy anything (yet - that's done later,
|
|
since paths are copied when they are used in a derivation),
|
|
and none of the strings are allowed to have contexts. */
|
|
if (first) {
|
|
isPath = vStr.type == tPath;
|
|
first = false;
|
|
}
|
|
|
|
s << state.coerceToString(vStr, context, false, !isPath);
|
|
}
|
|
|
|
if (isPath && !context.empty())
|
|
throwEvalError("a string that refers to a store path cannot be appended to a path, in `%1%'", s.str());
|
|
|
|
if (isPath)
|
|
mkPath(v, s.str().c_str());
|
|
else
|
|
mkString(v, s.str(), context);
|
|
}
|
|
|
|
|
|
void EvalState::forceValue(Value & v)
|
|
{
|
|
if (v.type == tThunk) {
|
|
ValueType saved = v.type;
|
|
try {
|
|
v.type = tBlackhole;
|
|
eval(*v.thunk.env, v.thunk.expr, v);
|
|
} catch (Error & e) {
|
|
v.type = saved;
|
|
throw;
|
|
}
|
|
}
|
|
else if (v.type == tCopy) {
|
|
forceValue(*v.val);
|
|
v = *v.val;
|
|
}
|
|
else if (v.type == tApp)
|
|
callFunction(*v.app.left, *v.app.right, v);
|
|
else if (v.type == tBlackhole)
|
|
throwEvalError("infinite recursion encountered");
|
|
}
|
|
|
|
|
|
void EvalState::strictForceValue(Value & v)
|
|
{
|
|
forceValue(v);
|
|
|
|
if (v.type == tAttrs) {
|
|
foreach (Bindings::iterator, i, *v.attrs)
|
|
strictForceValue(i->second);
|
|
}
|
|
|
|
else if (v.type == tList) {
|
|
for (unsigned int n = 0; n < v.list.length; ++n)
|
|
strictForceValue(v.list.elems[n]);
|
|
}
|
|
}
|
|
|
|
|
|
int EvalState::forceInt(Value & v)
|
|
{
|
|
forceValue(v);
|
|
if (v.type != tInt)
|
|
throwTypeError("value is %1% while an integer was expected", showType(v));
|
|
return v.integer;
|
|
}
|
|
|
|
|
|
bool EvalState::forceBool(Value & v)
|
|
{
|
|
forceValue(v);
|
|
if (v.type != tBool)
|
|
throwTypeError("value is %1% while a Boolean was expected", showType(v));
|
|
return v.boolean;
|
|
}
|
|
|
|
|
|
void EvalState::forceAttrs(Value & v)
|
|
{
|
|
forceValue(v);
|
|
if (v.type != tAttrs)
|
|
throwTypeError("value is %1% while an attribute set was expected", showType(v));
|
|
}
|
|
|
|
|
|
void EvalState::forceList(Value & v)
|
|
{
|
|
forceValue(v);
|
|
if (v.type != tList)
|
|
throwTypeError("value is %1% while a list was expected", showType(v));
|
|
}
|
|
|
|
|
|
void EvalState::forceFunction(Value & v)
|
|
{
|
|
forceValue(v);
|
|
if (v.type != tLambda && v.type != tPrimOp && v.type != tPrimOpApp)
|
|
throwTypeError("value is %1% while a function was expected", showType(v));
|
|
}
|
|
|
|
|
|
string EvalState::forceString(Value & v)
|
|
{
|
|
forceValue(v);
|
|
if (v.type != tString)
|
|
throwTypeError("value is %1% while a string was expected", showType(v));
|
|
return string(v.string.s);
|
|
}
|
|
|
|
|
|
string EvalState::forceString(Value & v, PathSet & context)
|
|
{
|
|
string s = forceString(v);
|
|
if (v.string.context)
|
|
for (const char * * p = v.string.context; *p; ++p)
|
|
context.insert(*p);
|
|
return s;
|
|
}
|
|
|
|
|
|
string EvalState::forceStringNoCtx(Value & v)
|
|
{
|
|
string s = forceString(v);
|
|
if (v.string.context)
|
|
throwEvalError("the string `%1%' is not allowed to refer to a store path (such as `%2%')",
|
|
v.string.s, v.string.context[0]);
|
|
return s;
|
|
}
|
|
|
|
|
|
bool EvalState::isDerivation(Value & v)
|
|
{
|
|
if (v.type != tAttrs) return false;
|
|
Bindings::iterator i = v.attrs->find(sType);
|
|
return i != v.attrs->end() && forceStringNoCtx(i->second) == "derivation";
|
|
}
|
|
|
|
|
|
string EvalState::coerceToString(Value & v, PathSet & context,
|
|
bool coerceMore, bool copyToStore)
|
|
{
|
|
forceValue(v);
|
|
|
|
string s;
|
|
|
|
if (v.type == tString) {
|
|
if (v.string.context)
|
|
for (const char * * p = v.string.context; *p; ++p)
|
|
context.insert(*p);
|
|
return v.string.s;
|
|
}
|
|
|
|
if (v.type == tPath) {
|
|
Path path(canonPath(v.path));
|
|
|
|
if (!copyToStore) return path;
|
|
|
|
if (nix::isDerivation(path))
|
|
throwEvalError("file names are not allowed to end in `%1%'", drvExtension);
|
|
|
|
Path dstPath;
|
|
if (srcToStore[path] != "")
|
|
dstPath = srcToStore[path];
|
|
else {
|
|
dstPath = readOnlyMode
|
|
? computeStorePathForPath(path).first
|
|
: store->addToStore(path);
|
|
srcToStore[path] = dstPath;
|
|
printMsg(lvlChatty, format("copied source `%1%' -> `%2%'")
|
|
% path % dstPath);
|
|
}
|
|
|
|
context.insert(dstPath);
|
|
return dstPath;
|
|
}
|
|
|
|
if (v.type == tAttrs) {
|
|
Bindings::iterator i = v.attrs->find(sOutPath);
|
|
if (i == v.attrs->end())
|
|
throwTypeError("cannot coerce an attribute set (except a derivation) to a string");
|
|
return coerceToString(i->second, context, coerceMore, copyToStore);
|
|
}
|
|
|
|
if (coerceMore) {
|
|
|
|
/* Note that `false' is represented as an empty string for
|
|
shell scripting convenience, just like `null'. */
|
|
if (v.type == tBool && v.boolean) return "1";
|
|
if (v.type == tBool && !v.boolean) return "";
|
|
if (v.type == tInt) return int2String(v.integer);
|
|
if (v.type == tNull) return "";
|
|
|
|
if (v.type == tList) {
|
|
string result;
|
|
for (unsigned int n = 0; n < v.list.length; ++n) {
|
|
result += coerceToString(v.list.elems[n],
|
|
context, coerceMore, copyToStore);
|
|
if (n < v.list.length - 1
|
|
/* !!! not quite correct */
|
|
&& (v.list.elems[n].type != tList || v.list.elems[n].list.length != 0))
|
|
result += " ";
|
|
}
|
|
return result;
|
|
}
|
|
}
|
|
|
|
throwTypeError("cannot coerce %1% to a string", showType(v));
|
|
}
|
|
|
|
|
|
Path EvalState::coerceToPath(Value & v, PathSet & context)
|
|
{
|
|
string path = coerceToString(v, context, false, false);
|
|
if (path == "" || path[0] != '/')
|
|
throwEvalError("string `%1%' doesn't represent an absolute path", path);
|
|
return path;
|
|
}
|
|
|
|
|
|
bool EvalState::eqValues(Value & v1, Value & v2)
|
|
{
|
|
forceValue(v1);
|
|
forceValue(v2);
|
|
|
|
/* !!! Hack to support some old broken code that relies on pointer
|
|
equality tests between attribute sets. (Specifically,
|
|
builderDefs calls uniqList on a list of attribute sets.) Will
|
|
remove this eventually. */
|
|
if (&v1 == &v2) return true;
|
|
|
|
if (v1.type != v2.type) return false;
|
|
|
|
switch (v1.type) {
|
|
|
|
case tInt:
|
|
return v1.integer == v2.integer;
|
|
|
|
case tBool:
|
|
return v1.boolean == v2.boolean;
|
|
|
|
case tString:
|
|
/* !!! contexts */
|
|
return strcmp(v1.string.s, v2.string.s) == 0;
|
|
|
|
case tPath:
|
|
return strcmp(v1.path, v2.path) == 0;
|
|
|
|
case tNull:
|
|
return true;
|
|
|
|
case tList:
|
|
if (v2.type != tList || v1.list.length != v2.list.length) return false;
|
|
for (unsigned int n = 0; n < v1.list.length; ++n)
|
|
if (!eqValues(v1.list.elems[n], v2.list.elems[n])) return false;
|
|
return true;
|
|
|
|
case tAttrs: {
|
|
if (v2.type != tAttrs || v1.attrs->size() != v2.attrs->size()) return false;
|
|
Bindings::iterator i, j;
|
|
for (i = v1.attrs->begin(), j = v2.attrs->begin(); i != v1.attrs->end(); ++i, ++j)
|
|
if (!eqValues(i->second, j->second)) return false;
|
|
return true;
|
|
}
|
|
|
|
/* Functions are incomparable. */
|
|
case tLambda:
|
|
case tPrimOp:
|
|
case tPrimOpApp:
|
|
return false;
|
|
|
|
default:
|
|
throwEvalError("cannot compare %1% with %2%", showType(v1), showType(v2));
|
|
}
|
|
}
|
|
|
|
|
|
void EvalState::printStats()
|
|
{
|
|
char x;
|
|
bool showStats = getEnv("NIX_SHOW_STATS", "0") != "0";
|
|
Verbosity v = showStats ? lvlInfo : lvlDebug;
|
|
printMsg(v, "evaluation statistics:");
|
|
printMsg(v, format(" expressions evaluated: %1%") % nrEvaluated);
|
|
printMsg(v, format(" stack space used: %1% bytes") % (&x - deepestStack));
|
|
printMsg(v, format(" max eval() nesting depth: %1%") % maxRecursionDepth);
|
|
printMsg(v, format(" stack space per eval() level: %1% bytes") % ((&x - deepestStack) / (float) maxRecursionDepth));
|
|
printMsg(v, format(" values allocated: %1%") % nrValues);
|
|
printMsg(v, format(" environments allocated: %1%") % nrEnvs);
|
|
printMsg(v, format(" symbols in symbol table: %1%") % symbols.size());
|
|
}
|
|
|
|
|
|
}
|