1086 lines
29 KiB
C++
1086 lines
29 KiB
C++
#include "eval.hh"
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#include "parser.hh"
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#include "hash.hh"
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#include "util.hh"
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#include "store-api.hh"
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#include "derivations.hh"
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#include "globals.hh"
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#include <cstring>
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#define LocalNoInline(f) static f __attribute__((noinline)); f
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#define LocalNoInlineNoReturn(f) static f __attribute__((noinline, noreturn)); f
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namespace nix {
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std::ostream & operator << (std::ostream & str, Value & v)
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{
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switch (v.type) {
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case tInt:
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str << v.integer;
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break;
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case tBool:
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str << (v.boolean ? "true" : "false");
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break;
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case tString:
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str << "\"";
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for (const char * i = v.string.s; *i; i++)
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if (*i == '\"' || *i == '\\') str << "\\" << *i;
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else if (*i == '\n') str << "\\n";
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else if (*i == '\r') str << "\\r";
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else if (*i == '\t') str << "\\t";
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else str << *i;
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str << "\"";
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break;
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case tPath:
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str << v.path; // !!! escaping?
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break;
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case tNull:
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str << "true";
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break;
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case tAttrs: {
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str << "{ ";
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typedef std::map<string, Value *> Sorted;
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Sorted sorted;
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foreach (Bindings::iterator, i, *v.attrs)
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sorted[i->first] = &i->second.value;
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foreach (Sorted::iterator, i, sorted)
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str << i->first << " = " << *i->second << "; ";
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str << "}";
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break;
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}
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case tList:
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str << "[ ";
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for (unsigned int n = 0; n < v.list.length; ++n)
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str << *v.list.elems[n] << " ";
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str << "]";
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break;
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case tThunk:
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case tCopy:
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str << "<CODE>";
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break;
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case tLambda:
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str << "<LAMBDA>";
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break;
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case tPrimOp:
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str << "<PRIMOP>";
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break;
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case tPrimOpApp:
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str << "<PRIMOP-APP>";
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break;
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default:
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throw Error("invalid value");
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}
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return str;
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}
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string showType(const Value & v)
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{
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switch (v.type) {
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case tInt: return "an integer";
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case tBool: return "a boolean";
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case tString: return "a string";
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case tPath: return "a path";
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case tNull: return "null";
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case tAttrs: return "an attribute set";
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case tList: return "a list";
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case tThunk: return "a thunk";
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case tApp: return "a function application";
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case tLambda: return "a function";
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case tCopy: return "a copy";
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case tBlackhole: return "a black hole";
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case tPrimOp: return "a built-in function";
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case tPrimOpApp: return "a partially applied built-in function";
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}
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abort();
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}
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EvalState::EvalState()
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: sWith(symbols.create("<with>"))
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, sOutPath(symbols.create("outPath"))
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, sDrvPath(symbols.create("drvPath"))
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, sType(symbols.create("type"))
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, sMeta(symbols.create("meta"))
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, sName(symbols.create("name"))
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, sSystem(symbols.create("system"))
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, baseEnv(allocEnv(128))
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, baseEnvDispl(0)
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, staticBaseEnv(false, 0)
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{
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nrEnvs = nrValuesInEnvs = nrValues = nrListElems = 0;
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nrEvaluated = recursionDepth = maxRecursionDepth = 0;
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deepestStack = (char *) -1;
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createBaseEnv();
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allowUnsafeEquality = getEnv("NIX_NO_UNSAFE_EQ", "") == "";
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}
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EvalState::~EvalState()
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{
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assert(recursionDepth == 0);
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}
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void EvalState::addConstant(const string & name, Value & v)
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{
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staticBaseEnv.vars[symbols.create(name)] = baseEnvDispl;
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baseEnv.values[baseEnvDispl++] = v;
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string name2 = string(name, 0, 2) == "__" ? string(name, 2) : name;
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(*baseEnv.values[0].attrs)[symbols.create(name2)].value = v;
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}
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void EvalState::addPrimOp(const string & name,
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unsigned int arity, PrimOp primOp)
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{
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Value v;
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string name2 = string(name, 0, 2) == "__" ? string(name, 2) : name;
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v.type = tPrimOp;
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v.primOp.arity = arity;
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v.primOp.fun = primOp;
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v.primOp.name = strdup(name2.c_str());
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staticBaseEnv.vars[symbols.create(name)] = baseEnvDispl;
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baseEnv.values[baseEnvDispl++] = v;
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(*baseEnv.values[0].attrs)[symbols.create(name2)].value = v;
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}
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/* Every "format" object (even temporary) takes up a few hundred bytes
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of stack space, which is a real killer in the recursive
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evaluator. So here are some helper functions for throwing
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exceptions. */
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LocalNoInlineNoReturn(void throwEvalError(const char * s))
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{
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throw EvalError(s);
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}
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LocalNoInlineNoReturn(void throwEvalError(const char * s, const string & s2))
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{
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throw EvalError(format(s) % s2);
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}
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LocalNoInlineNoReturn(void throwEvalError(const char * s, const string & s2, const string & s3))
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{
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throw EvalError(format(s) % s2 % s3);
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}
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LocalNoInlineNoReturn(void throwTypeError(const char * s))
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{
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throw TypeError(s);
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}
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LocalNoInlineNoReturn(void throwTypeError(const char * s, const string & s2))
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{
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throw TypeError(format(s) % s2);
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}
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LocalNoInlineNoReturn(void throwTypeError(const char * s, const Pos & pos, const string & s2))
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{
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throw TypeError(format(s) % pos % s2);
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}
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LocalNoInlineNoReturn(void throwTypeError(const char * s, const Pos & pos))
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{
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throw TypeError(format(s) % pos);
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}
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LocalNoInlineNoReturn(void throwAssertionError(const char * s, const Pos & pos))
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{
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throw AssertionError(format(s) % pos);
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}
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LocalNoInline(void addErrorPrefix(Error & e, const char * s, const string & s2))
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{
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e.addPrefix(format(s) % s2);
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}
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LocalNoInline(void addErrorPrefix(Error & e, const char * s, const Pos & pos))
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{
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e.addPrefix(format(s) % pos);
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}
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LocalNoInline(void addErrorPrefix(Error & e, const char * s, const string & s2, const Pos & pos))
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{
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e.addPrefix(format(s) % s2 % pos);
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}
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void mkString(Value & v, const char * s)
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{
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v.type = tString;
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v.string.s = strdup(s);
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v.string.context = 0;
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}
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void mkString(Value & v, const string & s, const PathSet & context)
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{
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mkString(v, s.c_str());
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if (!context.empty()) {
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unsigned int n = 0;
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v.string.context = new const char *[context.size() + 1];
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foreach (PathSet::const_iterator, i, context)
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v.string.context[n++] = strdup(i->c_str());
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v.string.context[n] = 0;
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}
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}
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void mkPath(Value & v, const char * s)
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{
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v.type = tPath;
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v.path = strdup(s);
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}
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Value * EvalState::lookupVar(Env * env, const VarRef & var)
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{
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for (unsigned int l = var.level; l; --l, env = env->up) ;
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if (var.fromWith) {
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while (1) {
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Bindings::iterator j = env->values[0].attrs->find(var.name);
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if (j != env->values[0].attrs->end())
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return &j->second.value;
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if (env->prevWith == 0)
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throwEvalError("undefined variable `%1%'", var.name);
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for (unsigned int l = env->prevWith; l; --l, env = env->up) ;
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}
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} else
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return &env->values[var.displ];
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}
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Value * EvalState::allocValues(unsigned int count)
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{
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nrValues += count;
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return new Value[count]; // !!! check destructor
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}
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Env & EvalState::allocEnv(unsigned int size)
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{
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nrEnvs++;
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nrValuesInEnvs += size;
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Env * env = (Env *) malloc(sizeof(Env) + size * sizeof(Value));
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return *env;
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}
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void EvalState::mkList(Value & v, unsigned int length)
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{
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v.type = tList;
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v.list.length = length;
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v.list.elems = new Value *[length];
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nrListElems += length;
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}
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void EvalState::mkAttrs(Value & v)
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{
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v.type = tAttrs;
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v.attrs = new Bindings;
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}
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void EvalState::mkThunk_(Value & v, Expr * expr)
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{
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mkThunk(v, baseEnv, expr);
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}
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void EvalState::cloneAttrs(Value & src, Value & dst)
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{
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mkAttrs(dst);
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foreach (Bindings::iterator, i, *src.attrs) {
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Attr & a = (*dst.attrs)[i->first];
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mkCopy(a.value, i->second.value);
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a.pos = i->second.pos;
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}
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}
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void EvalState::evalFile(const Path & path, Value & v)
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{
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startNest(nest, lvlTalkative, format("evaluating file `%1%'") % path);
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Expr * e = parseTrees[path];
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if (!e) {
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e = parseExprFromFile(*this, path);
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parseTrees[path] = e;
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}
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try {
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eval(e, v);
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} catch (Error & e) {
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addErrorPrefix(e, "while evaluating the file `%1%':\n", path);
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throw;
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}
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}
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struct RecursionCounter
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{
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EvalState & state;
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RecursionCounter(EvalState & state) : state(state)
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{
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state.recursionDepth++;
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if (state.recursionDepth > state.maxRecursionDepth)
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state.maxRecursionDepth = state.recursionDepth;
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}
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~RecursionCounter()
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{
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state.recursionDepth--;
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}
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};
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void EvalState::eval(Env & env, Expr * e, Value & v)
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{
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/* When changing this function, make sure that you don't cause a
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(large) increase in stack consumption! */
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/* !!! Disable this eventually. */
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RecursionCounter r(*this);
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char x;
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if (&x < deepestStack) deepestStack = &x;
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//debug(format("eval: %1%") % *e);
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checkInterrupt();
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nrEvaluated++;
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e->eval(*this, env, v);
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}
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void EvalState::eval(Expr * e, Value & v)
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{
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eval(baseEnv, e, v);
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}
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bool EvalState::evalBool(Env & env, Expr * e)
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{
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Value v;
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eval(env, e, v);
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if (v.type != tBool)
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throwTypeError("value is %1% while a Boolean was expected", showType(v));
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return v.boolean;
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}
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void EvalState::evalAttrs(Env & env, Expr * e, Value & v)
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{
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eval(env, e, v);
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if (v.type != tAttrs)
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throwTypeError("value is %1% while an attribute set was expected", showType(v));
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}
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void Expr::eval(EvalState & state, Env & env, Value & v)
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{
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abort();
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}
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void ExprInt::eval(EvalState & state, Env & env, Value & v)
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{
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mkInt(v, n);
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}
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void ExprString::eval(EvalState & state, Env & env, Value & v)
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{
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mkString(v, s.c_str());
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}
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void ExprPath::eval(EvalState & state, Env & env, Value & v)
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{
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mkPath(v, s.c_str());
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}
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void ExprAttrs::eval(EvalState & state, Env & env, Value & v)
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{
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state.mkAttrs(v);
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if (recursive) {
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/* Create a new environment that contains the attributes in
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this `rec'. */
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Env & env2(state.allocEnv(attrs.size() + inherited.size()));
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env2.up = &env;
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unsigned int displ = 0;
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/* The recursive attributes are evaluated in the new
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environment. */
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foreach (Attrs::iterator, i, attrs) {
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nix::Attr & a = (*v.attrs)[i->first];
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mkCopy(a.value, env2.values[displ]);
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mkThunk(env2.values[displ++], env2, i->second.first);
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a.pos = &i->second.second;
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}
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/* The inherited attributes, on the other hand, are
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evaluated in the original environment. */
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foreach (list<Inherited>::iterator, i, inherited) {
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nix::Attr & a = (*v.attrs)[i->first.name];
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Value * v2 = state.lookupVar(&env, i->first);
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mkCopy(a.value, *v2);
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mkCopy(env2.values[displ++], *v2);
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a.pos = &i->second;
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}
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}
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else {
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foreach (Attrs::iterator, i, attrs) {
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nix::Attr & a = (*v.attrs)[i->first];
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mkThunk(a.value, env, i->second.first);
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a.pos = &i->second.second;
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}
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foreach (list<Inherited>::iterator, i, inherited) {
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nix::Attr & a = (*v.attrs)[i->first.name];
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mkCopy(a.value, *state.lookupVar(&env, i->first));
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a.pos = &i->second;
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}
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}
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}
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void ExprLet::eval(EvalState & state, Env & env, Value & v)
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{
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/* Create a new environment that contains the attributes in this
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`let'. */
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Env & env2(state.allocEnv(attrs->attrs.size() + attrs->inherited.size()));
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env2.up = &env;
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unsigned int displ = 0;
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/* The recursive attributes are evaluated in the new
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environment. */
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foreach (ExprAttrs::Attrs::iterator, i, attrs->attrs)
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mkThunk(env2.values[displ++], env2, i->second.first);
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/* The inherited attributes, on the other hand, are evaluated in
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the original environment. */
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foreach (list<ExprAttrs::Inherited>::iterator, i, attrs->inherited)
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mkCopy(env2.values[displ++], *state.lookupVar(&env, i->first));
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state.eval(env2, body, v);
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}
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void ExprList::eval(EvalState & state, Env & env, Value & v)
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{
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state.mkList(v, elems.size());
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Value * vs = state.allocValues(v.list.length);
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for (unsigned int n = 0; n < v.list.length; ++n) {
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v.list.elems[n] = &vs[n];
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mkThunk(vs[n], env, elems[n]);
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}
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}
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void ExprVar::eval(EvalState & state, Env & env, Value & v)
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{
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Value * v2 = state.lookupVar(&env, info);
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state.forceValue(*v2);
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v = *v2;
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}
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void ExprSelect::eval(EvalState & state, Env & env, Value & v)
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{
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Value v2;
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state.evalAttrs(env, e, v2);
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Bindings::iterator i = v2.attrs->find(name);
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if (i == v2.attrs->end())
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throwEvalError("attribute `%1%' missing", name);
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try {
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state.forceValue(i->second.value);
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} catch (Error & e) {
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addErrorPrefix(e, "while evaluating the attribute `%1%' at %2%:\n",
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name, *i->second.pos);
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throw;
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}
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v = i->second.value;
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}
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void ExprOpHasAttr::eval(EvalState & state, Env & env, Value & v)
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{
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Value vAttrs;
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state.evalAttrs(env, e, vAttrs);
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mkBool(v, vAttrs.attrs->find(name) != vAttrs.attrs->end());
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}
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void ExprLambda::eval(EvalState & state, Env & env, Value & v)
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{
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v.type = tLambda;
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v.lambda.env = &env;
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v.lambda.fun = this;
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}
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void ExprApp::eval(EvalState & state, Env & env, Value & v)
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{
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Value vFun;
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state.eval(env, e1, vFun);
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Value vArg;
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mkThunk(vArg, env, e2); // !!! should this be on the heap?
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state.callFunction(vFun, vArg, v);
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}
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void EvalState::callFunction(Value & fun, Value & arg, Value & v)
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{
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if (fun.type == tPrimOp || fun.type == tPrimOpApp) {
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unsigned int argsLeft =
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fun.type == tPrimOp ? fun.primOp.arity : fun.primOpApp.argsLeft;
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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. */
|
|
try {
|
|
primOp->primOp.fun(*this, vArgs, v);
|
|
} catch (Error & e) {
|
|
addErrorPrefix(e, "while evaluating the builtin function `%1%':\n", primOp->primOp.name);
|
|
throw;
|
|
}
|
|
} 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.value);
|
|
}
|
|
}
|
|
|
|
/* 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;
|
|
env2.prevWith = prevWith;
|
|
|
|
state.evalAttrs(env, attrs, env2.values[0]);
|
|
|
|
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.evalAttrs(env, e1, v2);
|
|
|
|
state.cloneAttrs(v2, v);
|
|
|
|
state.evalAttrs(env, e2, v2);
|
|
|
|
foreach (Bindings::iterator, i, *v2.attrs) {
|
|
Attr & a = (*v.attrs)[i->first];
|
|
mkCopy(a.value, i->second.value);
|
|
a.pos = i->second.pos;
|
|
}
|
|
}
|
|
|
|
|
|
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);
|
|
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.value);
|
|
}
|
|
|
|
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.value) == "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.value, 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: {
|
|
/* Compare both the string and its context. */
|
|
if (strcmp(v1.string.s, v2.string.s) != 0) return false;
|
|
const char * * p = v1.string.context, * * q = v2.string.context;
|
|
if (!p && !q) return true;
|
|
if (!p || !q) return false;
|
|
for ( ; *p && *q; ++p, ++q)
|
|
if (strcmp(*p, *q) != 0) return false;
|
|
if (*p || *q) return false;
|
|
return true;
|
|
}
|
|
|
|
case tPath:
|
|
return strcmp(v1.path, v2.path) == 0;
|
|
|
|
case tNull:
|
|
return true;
|
|
|
|
case tList:
|
|
if (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 (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 (i->first != j->first || !eqValues(i->second.value, j->second.value))
|
|
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(" environments allocated: %1% (%2% bytes)")
|
|
% nrEnvs % (nrEnvs * sizeof(Env)));
|
|
printMsg(v, format(" values allocated in environments: %1% (%2% bytes)")
|
|
% nrValuesInEnvs % (nrValuesInEnvs * sizeof(Value)));
|
|
printMsg(v, format(" list elements: %1% (%2% bytes)")
|
|
% nrListElems % (nrListElems * sizeof(Value *)));
|
|
printMsg(v, format(" misc. values allocated: %1% (%2% bytes)")
|
|
% nrValues % (nrValues * sizeof(Value)));
|
|
printMsg(v, format(" symbols in symbol table: %1%") % symbols.size());
|
|
}
|
|
|
|
|
|
}
|