forked from lix-project/lix
6de33a9c67
Previously, all derivation attributes had to be coerced into strings
so that they could be passed via the environment. This is lossy
(e.g. lists get flattened, necessitating configureFlags
vs. configureFlagsArray, of which the latter cannot be specified as an
attribute), doesn't support attribute sets at all, and has size
limitations (necessitating hacks like passAsFile).
This patch adds a new mode for passing attributes to builders, namely
encoded as a JSON file ".attrs.json" in the current directory of the
builder. This mode is activated via the special attribute
__structuredAttrs = true;
(The idea is that one day we can set this in stdenv.mkDerivation.)
For example,
stdenv.mkDerivation {
__structuredAttrs = true;
name = "foo";
buildInputs = [ pkgs.hello pkgs.cowsay ];
doCheck = true;
hardening.format = false;
}
results in a ".attrs.json" file containing (sans the indentation):
{
"buildInputs": [],
"builder": "/nix/store/ygl61ycpr2vjqrx775l1r2mw1g2rb754-bash-4.3-p48/bin/bash",
"configureFlags": [
"--with-foo",
"--with-bar=1 2"
],
"doCheck": true,
"hardening": {
"format": false
},
"name": "foo",
"nativeBuildInputs": [
"/nix/store/10h6li26i7g6z3mdpvra09yyf10mmzdr-hello-2.10",
"/nix/store/4jnvjin0r6wp6cv1hdm5jbkx3vinlcvk-cowsay-3.03"
],
"propagatedBuildInputs": [],
"propagatedNativeBuildInputs": [],
"stdenv": "/nix/store/f3hw3p8armnzy6xhd4h8s7anfjrs15n2-stdenv",
"system": "x86_64-linux"
}
"passAsFile" is ignored in this mode because it's not needed - large
strings are included directly in the JSON representation.
It is up to the builder to do something with the JSON
representation. For example, in bash-based builders, lists/attrsets of
string values could be mapped to bash (associative) arrays.
1815 lines
51 KiB
C++
1815 lines
51 KiB
C++
#include "eval.hh"
|
||
#include "hash.hh"
|
||
#include "util.hh"
|
||
#include "store-api.hh"
|
||
#include "derivations.hh"
|
||
#include "globals.hh"
|
||
#include "eval-inline.hh"
|
||
#include "download.hh"
|
||
|
||
#include <algorithm>
|
||
#include <cstring>
|
||
#include <unistd.h>
|
||
#include <sys/time.h>
|
||
#include <sys/resource.h>
|
||
|
||
#if HAVE_BOEHMGC
|
||
|
||
#include <gc/gc.h>
|
||
#include <gc/gc_cpp.h>
|
||
|
||
#define NEW new (UseGC)
|
||
|
||
#else
|
||
|
||
#define NEW new
|
||
|
||
#endif
|
||
|
||
|
||
namespace nix {
|
||
|
||
|
||
static char * dupString(const char * s)
|
||
{
|
||
char * t;
|
||
#if HAVE_BOEHMGC
|
||
t = GC_strdup(s);
|
||
#else
|
||
t = strdup(s);
|
||
#endif
|
||
if (!t) throw std::bad_alloc();
|
||
return t;
|
||
}
|
||
|
||
|
||
static void * allocBytes(size_t n)
|
||
{
|
||
void * p;
|
||
#if HAVE_BOEHMGC
|
||
p = GC_malloc(n);
|
||
#else
|
||
p = malloc(n);
|
||
#endif
|
||
if (!p) throw std::bad_alloc();
|
||
return p;
|
||
}
|
||
|
||
|
||
static void printValue(std::ostream & str, std::set<const Value *> & active, const Value & v)
|
||
{
|
||
checkInterrupt();
|
||
|
||
if (active.find(&v) != active.end()) {
|
||
str << "<CYCLE>";
|
||
return;
|
||
}
|
||
active.insert(&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 << "null";
|
||
break;
|
||
case tAttrs: {
|
||
str << "{ ";
|
||
for (auto & i : v.attrs->lexicographicOrder()) {
|
||
str << i->name << " = ";
|
||
printValue(str, active, *i->value);
|
||
str << "; ";
|
||
}
|
||
str << "}";
|
||
break;
|
||
}
|
||
case tList1:
|
||
case tList2:
|
||
case tListN:
|
||
str << "[ ";
|
||
for (unsigned int n = 0; n < v.listSize(); ++n) {
|
||
printValue(str, active, *v.listElems()[n]);
|
||
str << " ";
|
||
}
|
||
str << "]";
|
||
break;
|
||
case tThunk:
|
||
case tApp:
|
||
str << "<CODE>";
|
||
break;
|
||
case tLambda:
|
||
str << "<LAMBDA>";
|
||
break;
|
||
case tPrimOp:
|
||
str << "<PRIMOP>";
|
||
break;
|
||
case tPrimOpApp:
|
||
str << "<PRIMOP-APP>";
|
||
break;
|
||
case tExternal:
|
||
str << *v.external;
|
||
break;
|
||
case tFloat:
|
||
str << v.fpoint;
|
||
break;
|
||
default:
|
||
throw Error("invalid value");
|
||
}
|
||
|
||
active.erase(&v);
|
||
}
|
||
|
||
|
||
std::ostream & operator << (std::ostream & str, const Value & v)
|
||
{
|
||
std::set<const Value *> active;
|
||
printValue(str, active, v);
|
||
return str;
|
||
}
|
||
|
||
|
||
string showType(const 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 tNull: return "null";
|
||
case tAttrs: return "a set";
|
||
case tList1: case tList2: case tListN: return "a list";
|
||
case tThunk: return "a thunk";
|
||
case tApp: return "a function application";
|
||
case tLambda: return "a function";
|
||
case tBlackhole: return "a black hole";
|
||
case tPrimOp: return "a built-in function";
|
||
case tPrimOpApp: return "a partially applied built-in function";
|
||
case tExternal: return v.external->showType();
|
||
case tFloat: return "a float";
|
||
}
|
||
abort();
|
||
}
|
||
|
||
|
||
#if HAVE_BOEHMGC
|
||
/* Called when the Boehm GC runs out of memory. */
|
||
static void * oomHandler(size_t requested)
|
||
{
|
||
/* Convert this to a proper C++ exception. */
|
||
throw std::bad_alloc();
|
||
}
|
||
#endif
|
||
|
||
|
||
static Symbol getName(const AttrName & name, EvalState & state, Env & env)
|
||
{
|
||
if (name.symbol.set()) {
|
||
return name.symbol;
|
||
} else {
|
||
Value nameValue;
|
||
name.expr->eval(state, env, nameValue);
|
||
state.forceStringNoCtx(nameValue);
|
||
return state.symbols.create(nameValue.string.s);
|
||
}
|
||
}
|
||
|
||
|
||
static bool gcInitialised = false;
|
||
|
||
void initGC()
|
||
{
|
||
if (gcInitialised) return;
|
||
|
||
#if HAVE_BOEHMGC
|
||
/* Initialise the Boehm garbage collector. */
|
||
GC_set_all_interior_pointers(0);
|
||
|
||
GC_INIT();
|
||
|
||
GC_oom_fn = oomHandler;
|
||
|
||
/* Set the initial heap size to something fairly big (25% of
|
||
physical RAM, up to a maximum of 384 MiB) so that in most cases
|
||
we don't need to garbage collect at all. (Collection has a
|
||
fairly significant overhead.) The heap size can be overridden
|
||
through libgc's GC_INITIAL_HEAP_SIZE environment variable. We
|
||
should probably also provide a nix.conf setting for this. Note
|
||
that GC_expand_hp() causes a lot of virtual, but not physical
|
||
(resident) memory to be allocated. This might be a problem on
|
||
systems that don't overcommit. */
|
||
if (!getenv("GC_INITIAL_HEAP_SIZE")) {
|
||
size_t size = 32 * 1024 * 1024;
|
||
#if HAVE_SYSCONF && defined(_SC_PAGESIZE) && defined(_SC_PHYS_PAGES)
|
||
size_t maxSize = 384 * 1024 * 1024;
|
||
long pageSize = sysconf(_SC_PAGESIZE);
|
||
long pages = sysconf(_SC_PHYS_PAGES);
|
||
if (pageSize != -1)
|
||
size = (pageSize * pages) / 4; // 25% of RAM
|
||
if (size > maxSize) size = maxSize;
|
||
#endif
|
||
debug(format("setting initial heap size to %1% bytes") % size);
|
||
GC_expand_hp(size);
|
||
}
|
||
|
||
#endif
|
||
|
||
gcInitialised = true;
|
||
}
|
||
|
||
|
||
/* Very hacky way to parse $NIX_PATH, which is colon-separated, but
|
||
can contain URLs (e.g. "nixpkgs=https://bla...:foo=https://"). */
|
||
static Strings parseNixPath(const string & s)
|
||
{
|
||
Strings res;
|
||
|
||
auto p = s.begin();
|
||
|
||
while (p != s.end()) {
|
||
auto start = p;
|
||
auto start2 = p;
|
||
|
||
while (p != s.end() && *p != ':') {
|
||
if (*p == '=') start2 = p + 1;
|
||
++p;
|
||
}
|
||
|
||
if (p == s.end()) {
|
||
if (p != start) res.push_back(std::string(start, p));
|
||
break;
|
||
}
|
||
|
||
if (*p == ':') {
|
||
if (isUri(std::string(start2, s.end()))) {
|
||
++p;
|
||
while (p != s.end() && *p != ':') ++p;
|
||
}
|
||
res.push_back(std::string(start, p));
|
||
if (p == s.end()) break;
|
||
}
|
||
|
||
++p;
|
||
}
|
||
|
||
return res;
|
||
}
|
||
|
||
|
||
EvalState::EvalState(const Strings & _searchPath, ref<Store> store)
|
||
: sWith(symbols.create("<with>"))
|
||
, sOutPath(symbols.create("outPath"))
|
||
, sDrvPath(symbols.create("drvPath"))
|
||
, sType(symbols.create("type"))
|
||
, sMeta(symbols.create("meta"))
|
||
, sName(symbols.create("name"))
|
||
, sValue(symbols.create("value"))
|
||
, sSystem(symbols.create("system"))
|
||
, sOverrides(symbols.create("__overrides"))
|
||
, sOutputs(symbols.create("outputs"))
|
||
, sOutputName(symbols.create("outputName"))
|
||
, sIgnoreNulls(symbols.create("__ignoreNulls"))
|
||
, sFile(symbols.create("file"))
|
||
, sLine(symbols.create("line"))
|
||
, sColumn(symbols.create("column"))
|
||
, sFunctor(symbols.create("__functor"))
|
||
, sToString(symbols.create("__toString"))
|
||
, sRight(symbols.create("right"))
|
||
, sWrong(symbols.create("wrong"))
|
||
, sStructuredAttrs(symbols.create("__structuredAttrs"))
|
||
, sBuilder(symbols.create("builder"))
|
||
, store(store)
|
||
, baseEnv(allocEnv(128))
|
||
, staticBaseEnv(false, 0)
|
||
{
|
||
countCalls = getEnv("NIX_COUNT_CALLS", "0") != "0";
|
||
|
||
restricted = settings.get("restrict-eval", false);
|
||
|
||
assert(gcInitialised);
|
||
|
||
/* Initialise the Nix expression search path. */
|
||
Strings paths = parseNixPath(getEnv("NIX_PATH", ""));
|
||
for (auto & i : _searchPath) addToSearchPath(i);
|
||
for (auto & i : paths) addToSearchPath(i);
|
||
addToSearchPath("nix=" + settings.nixDataDir + "/nix/corepkgs");
|
||
|
||
clearValue(vEmptySet);
|
||
vEmptySet.type = tAttrs;
|
||
vEmptySet.attrs = allocBindings(0);
|
||
|
||
createBaseEnv();
|
||
}
|
||
|
||
|
||
EvalState::~EvalState()
|
||
{
|
||
fileEvalCache.clear();
|
||
}
|
||
|
||
|
||
Path EvalState::checkSourcePath(const Path & path_)
|
||
{
|
||
if (!restricted) return path_;
|
||
|
||
/* Resolve symlinks. */
|
||
debug(format("checking access to ‘%s’") % path_);
|
||
Path path = canonPath(path_, true);
|
||
|
||
for (auto & i : searchPath) {
|
||
auto r = resolveSearchPathElem(i);
|
||
if (!r.first) continue;
|
||
if (path == r.second || isInDir(path, r.second))
|
||
return path;
|
||
}
|
||
|
||
/* To support import-from-derivation, allow access to anything in
|
||
the store. FIXME: only allow access to paths that have been
|
||
constructed by this evaluation. */
|
||
if (store->isInStore(path)) return path;
|
||
|
||
#if 0
|
||
/* Hack to support the chroot dependencies of corepkgs (see
|
||
corepkgs/config.nix.in). */
|
||
if (path == settings.nixPrefix && isStorePath(settings.nixPrefix))
|
||
return path;
|
||
#endif
|
||
|
||
throw RestrictedPathError(format("access to path ‘%1%’ is forbidden in restricted mode") % path_);
|
||
}
|
||
|
||
|
||
void EvalState::addConstant(const string & name, Value & v)
|
||
{
|
||
Value * v2 = allocValue();
|
||
*v2 = v;
|
||
staticBaseEnv.vars[symbols.create(name)] = baseEnvDispl;
|
||
baseEnv.values[baseEnvDispl++] = v2;
|
||
string name2 = string(name, 0, 2) == "__" ? string(name, 2) : name;
|
||
baseEnv.values[0]->attrs->push_back(Attr(symbols.create(name2), v2));
|
||
}
|
||
|
||
|
||
void EvalState::addPrimOp(const string & name,
|
||
unsigned int arity, PrimOpFun primOp)
|
||
{
|
||
Value * v = allocValue();
|
||
string name2 = string(name, 0, 2) == "__" ? string(name, 2) : name;
|
||
Symbol sym = symbols.create(name2);
|
||
v->type = tPrimOp;
|
||
v->primOp = NEW PrimOp(primOp, arity, sym);
|
||
staticBaseEnv.vars[symbols.create(name)] = baseEnvDispl;
|
||
baseEnv.values[baseEnvDispl++] = v;
|
||
baseEnv.values[0]->attrs->push_back(Attr(sym, v));
|
||
}
|
||
|
||
|
||
Value & EvalState::getBuiltin(const string & name)
|
||
{
|
||
return *baseEnv.values[0]->attrs->find(symbols.create(name))->value;
|
||
}
|
||
|
||
|
||
/* 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, const string & s2))
|
||
{
|
||
throw EvalError(format(s) % s2);
|
||
}
|
||
|
||
LocalNoInlineNoReturn(void throwEvalError(const char * s, const string & s2, const Pos & pos))
|
||
{
|
||
throw EvalError(format(s) % s2 % pos);
|
||
}
|
||
|
||
LocalNoInlineNoReturn(void throwEvalError(const char * s, const string & s2, const string & s3))
|
||
{
|
||
throw EvalError(format(s) % s2 % s3);
|
||
}
|
||
|
||
LocalNoInlineNoReturn(void throwEvalError(const char * s, const string & s2, const string & s3, const Pos & pos))
|
||
{
|
||
throw EvalError(format(s) % s2 % s3 % pos);
|
||
}
|
||
|
||
LocalNoInlineNoReturn(void throwEvalError(const char * s, const Symbol & sym, const Pos & p1, const Pos & p2))
|
||
{
|
||
throw EvalError(format(s) % sym % p1 % p2);
|
||
}
|
||
|
||
LocalNoInlineNoReturn(void throwTypeError(const char * s, const Pos & pos))
|
||
{
|
||
throw TypeError(format(s) % pos);
|
||
}
|
||
|
||
LocalNoInlineNoReturn(void throwTypeError(const char * s, const string & s1))
|
||
{
|
||
throw TypeError(format(s) % s1);
|
||
}
|
||
|
||
LocalNoInlineNoReturn(void throwTypeError(const char * s, const ExprLambda & fun, const Symbol & s2, const Pos & pos))
|
||
{
|
||
throw TypeError(format(s) % fun.showNamePos() % s2 % pos);
|
||
}
|
||
|
||
LocalNoInlineNoReturn(void throwAssertionError(const char * s, const Pos & pos))
|
||
{
|
||
throw AssertionError(format(s) % pos);
|
||
}
|
||
|
||
LocalNoInlineNoReturn(void throwUndefinedVarError(const char * s, const string & s1, const Pos & pos))
|
||
{
|
||
throw UndefinedVarError(format(s) % s1 % pos);
|
||
}
|
||
|
||
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 ExprLambda & fun, const Pos & pos))
|
||
{
|
||
e.addPrefix(format(s) % fun.showNamePos() % pos);
|
||
}
|
||
|
||
LocalNoInline(void addErrorPrefix(Error & e, const char * s, const string & s2, const Pos & pos))
|
||
{
|
||
e.addPrefix(format(s) % s2 % pos);
|
||
}
|
||
|
||
|
||
void mkString(Value & v, const char * s)
|
||
{
|
||
mkStringNoCopy(v, dupString(s));
|
||
}
|
||
|
||
|
||
Value & mkString(Value & v, const string & s, const PathSet & context)
|
||
{
|
||
mkString(v, s.c_str());
|
||
if (!context.empty()) {
|
||
unsigned int n = 0;
|
||
v.string.context = (const char * *)
|
||
allocBytes((context.size() + 1) * sizeof(char *));
|
||
for (auto & i : context)
|
||
v.string.context[n++] = dupString(i.c_str());
|
||
v.string.context[n] = 0;
|
||
}
|
||
return v;
|
||
}
|
||
|
||
|
||
void mkPath(Value & v, const char * s)
|
||
{
|
||
mkPathNoCopy(v, dupString(s));
|
||
}
|
||
|
||
|
||
inline Value * EvalState::lookupVar(Env * env, const ExprVar & var, bool noEval)
|
||
{
|
||
for (unsigned int l = var.level; l; --l, env = env->up) ;
|
||
|
||
if (!var.fromWith) return env->values[var.displ];
|
||
|
||
while (1) {
|
||
if (!env->haveWithAttrs) {
|
||
if (noEval) return 0;
|
||
Value * v = allocValue();
|
||
evalAttrs(*env->up, (Expr *) env->values[0], *v);
|
||
env->values[0] = v;
|
||
env->haveWithAttrs = true;
|
||
}
|
||
Bindings::iterator j = env->values[0]->attrs->find(var.name);
|
||
if (j != env->values[0]->attrs->end()) {
|
||
if (countCalls && j->pos) attrSelects[*j->pos]++;
|
||
return j->value;
|
||
}
|
||
if (!env->prevWith)
|
||
throwUndefinedVarError("undefined variable ‘%1%’ at %2%", var.name, var.pos);
|
||
for (unsigned int l = env->prevWith; l; --l, env = env->up) ;
|
||
}
|
||
}
|
||
|
||
|
||
Value * EvalState::allocValue()
|
||
{
|
||
nrValues++;
|
||
return (Value *) allocBytes(sizeof(Value));
|
||
}
|
||
|
||
|
||
Env & EvalState::allocEnv(unsigned int size)
|
||
{
|
||
assert(size <= std::numeric_limits<decltype(Env::size)>::max());
|
||
|
||
nrEnvs++;
|
||
nrValuesInEnvs += size;
|
||
Env * env = (Env *) allocBytes(sizeof(Env) + size * sizeof(Value *));
|
||
env->size = size;
|
||
|
||
/* Clear the values because maybeThunk() and lookupVar fromWith expect this. */
|
||
for (unsigned i = 0; i < size; ++i)
|
||
env->values[i] = 0;
|
||
|
||
return *env;
|
||
}
|
||
|
||
|
||
void EvalState::mkList(Value & v, unsigned int size)
|
||
{
|
||
clearValue(v);
|
||
if (size == 1)
|
||
v.type = tList1;
|
||
else if (size == 2)
|
||
v.type = tList2;
|
||
else {
|
||
v.type = tListN;
|
||
v.bigList.size = size;
|
||
v.bigList.elems = size ? (Value * *) allocBytes(size * sizeof(Value *)) : 0;
|
||
}
|
||
nrListElems += size;
|
||
}
|
||
|
||
|
||
unsigned long nrThunks = 0;
|
||
|
||
static inline void mkThunk(Value & v, Env & env, Expr * expr)
|
||
{
|
||
v.type = tThunk;
|
||
v.thunk.env = &env;
|
||
v.thunk.expr = expr;
|
||
nrThunks++;
|
||
}
|
||
|
||
|
||
void EvalState::mkThunk_(Value & v, Expr * expr)
|
||
{
|
||
mkThunk(v, baseEnv, expr);
|
||
}
|
||
|
||
|
||
void EvalState::mkPos(Value & v, Pos * pos)
|
||
{
|
||
if (pos) {
|
||
mkAttrs(v, 3);
|
||
mkString(*allocAttr(v, sFile), pos->file);
|
||
mkInt(*allocAttr(v, sLine), pos->line);
|
||
mkInt(*allocAttr(v, sColumn), pos->column);
|
||
v.attrs->sort();
|
||
} else
|
||
mkNull(v);
|
||
}
|
||
|
||
|
||
/* Create a thunk for the delayed computation of the given expression
|
||
in the given environment. But if the expression is a variable,
|
||
then look it up right away. This significantly reduces the number
|
||
of thunks allocated. */
|
||
Value * Expr::maybeThunk(EvalState & state, Env & env)
|
||
{
|
||
Value * v = state.allocValue();
|
||
mkThunk(*v, env, this);
|
||
return v;
|
||
}
|
||
|
||
|
||
unsigned long nrAvoided = 0;
|
||
|
||
Value * ExprVar::maybeThunk(EvalState & state, Env & env)
|
||
{
|
||
Value * v = state.lookupVar(&env, *this, true);
|
||
/* The value might not be initialised in the environment yet.
|
||
In that case, ignore it. */
|
||
if (v) { nrAvoided++; return v; }
|
||
return Expr::maybeThunk(state, env);
|
||
}
|
||
|
||
|
||
Value * ExprString::maybeThunk(EvalState & state, Env & env)
|
||
{
|
||
nrAvoided++;
|
||
return &v;
|
||
}
|
||
|
||
Value * ExprInt::maybeThunk(EvalState & state, Env & env)
|
||
{
|
||
nrAvoided++;
|
||
return &v;
|
||
}
|
||
|
||
Value * ExprFloat::maybeThunk(EvalState & state, Env & env)
|
||
{
|
||
nrAvoided++;
|
||
return &v;
|
||
}
|
||
|
||
Value * ExprPath::maybeThunk(EvalState & state, Env & env)
|
||
{
|
||
nrAvoided++;
|
||
return &v;
|
||
}
|
||
|
||
|
||
void EvalState::evalFile(const Path & path, Value & v)
|
||
{
|
||
FileEvalCache::iterator i;
|
||
if ((i = fileEvalCache.find(path)) != fileEvalCache.end()) {
|
||
v = i->second;
|
||
return;
|
||
}
|
||
|
||
Path path2 = resolveExprPath(path);
|
||
if ((i = fileEvalCache.find(path2)) != fileEvalCache.end()) {
|
||
v = i->second;
|
||
return;
|
||
}
|
||
|
||
Activity act(*logger, lvlTalkative, format("evaluating file ‘%1%’") % path2);
|
||
Expr * e = parseExprFromFile(checkSourcePath(path2));
|
||
try {
|
||
eval(e, v);
|
||
} catch (Error & e) {
|
||
addErrorPrefix(e, "while evaluating the file ‘%1%’:\n", path2);
|
||
throw;
|
||
}
|
||
|
||
fileEvalCache[path2] = v;
|
||
if (path != path2) fileEvalCache[path] = v;
|
||
}
|
||
|
||
|
||
void EvalState::resetFileCache()
|
||
{
|
||
fileEvalCache.clear();
|
||
}
|
||
|
||
|
||
void EvalState::eval(Expr * e, Value & v)
|
||
{
|
||
e->eval(*this, baseEnv, v);
|
||
}
|
||
|
||
|
||
inline bool EvalState::evalBool(Env & env, Expr * e)
|
||
{
|
||
Value v;
|
||
e->eval(*this, env, v);
|
||
if (v.type != tBool)
|
||
throwTypeError("value is %1% while a Boolean was expected", v);
|
||
return v.boolean;
|
||
}
|
||
|
||
|
||
inline bool EvalState::evalBool(Env & env, Expr * e, const Pos & pos)
|
||
{
|
||
Value v;
|
||
e->eval(*this, env, v);
|
||
if (v.type != tBool)
|
||
throwTypeError("value is %1% while a Boolean was expected, at %2%", v, pos);
|
||
return v.boolean;
|
||
}
|
||
|
||
|
||
inline void EvalState::evalAttrs(Env & env, Expr * e, Value & v)
|
||
{
|
||
e->eval(*this, env, v);
|
||
if (v.type != tAttrs)
|
||
throwTypeError("value is %1% while a set was expected", v);
|
||
}
|
||
|
||
|
||
void Expr::eval(EvalState & state, Env & env, Value & v)
|
||
{
|
||
abort();
|
||
}
|
||
|
||
|
||
void ExprInt::eval(EvalState & state, Env & env, Value & v)
|
||
{
|
||
v = this->v;
|
||
}
|
||
|
||
|
||
void ExprFloat::eval(EvalState & state, Env & env, Value & v)
|
||
{
|
||
v = this->v;
|
||
}
|
||
|
||
void ExprString::eval(EvalState & state, Env & env, Value & v)
|
||
{
|
||
v = this->v;
|
||
}
|
||
|
||
|
||
void ExprPath::eval(EvalState & state, Env & env, Value & v)
|
||
{
|
||
v = this->v;
|
||
}
|
||
|
||
|
||
void ExprAttrs::eval(EvalState & state, Env & env, Value & v)
|
||
{
|
||
state.mkAttrs(v, attrs.size() + dynamicAttrs.size());
|
||
Env *dynamicEnv = &env;
|
||
|
||
if (recursive) {
|
||
/* Create a new environment that contains the attributes in
|
||
this `rec'. */
|
||
Env & env2(state.allocEnv(attrs.size()));
|
||
env2.up = &env;
|
||
dynamicEnv = &env2;
|
||
|
||
AttrDefs::iterator overrides = attrs.find(state.sOverrides);
|
||
bool hasOverrides = overrides != attrs.end();
|
||
|
||
/* The recursive attributes are evaluated in the new
|
||
environment, while the inherited attributes are evaluated
|
||
in the original environment. */
|
||
unsigned int displ = 0;
|
||
for (auto & i : attrs) {
|
||
Value * vAttr;
|
||
if (hasOverrides && !i.second.inherited) {
|
||
vAttr = state.allocValue();
|
||
mkThunk(*vAttr, env2, i.second.e);
|
||
} else
|
||
vAttr = i.second.e->maybeThunk(state, i.second.inherited ? env : env2);
|
||
env2.values[displ++] = vAttr;
|
||
v.attrs->push_back(Attr(i.first, vAttr, &i.second.pos));
|
||
}
|
||
|
||
/* If the rec contains an attribute called `__overrides', then
|
||
evaluate it, and add the attributes in that set to the rec.
|
||
This allows overriding of recursive attributes, which is
|
||
otherwise not possible. (You can use the // operator to
|
||
replace an attribute, but other attributes in the rec will
|
||
still reference the original value, because that value has
|
||
been substituted into the bodies of the other attributes.
|
||
Hence we need __overrides.) */
|
||
if (hasOverrides) {
|
||
Value * vOverrides = (*v.attrs)[overrides->second.displ].value;
|
||
state.forceAttrs(*vOverrides);
|
||
Bindings * newBnds = state.allocBindings(v.attrs->size() + vOverrides->attrs->size());
|
||
for (auto & i : *v.attrs)
|
||
newBnds->push_back(i);
|
||
for (auto & i : *vOverrides->attrs) {
|
||
AttrDefs::iterator j = attrs.find(i.name);
|
||
if (j != attrs.end()) {
|
||
(*newBnds)[j->second.displ] = i;
|
||
env2.values[j->second.displ] = i.value;
|
||
} else
|
||
newBnds->push_back(i);
|
||
}
|
||
newBnds->sort();
|
||
v.attrs = newBnds;
|
||
}
|
||
}
|
||
|
||
else
|
||
for (auto & i : attrs)
|
||
v.attrs->push_back(Attr(i.first, i.second.e->maybeThunk(state, env), &i.second.pos));
|
||
|
||
/* Dynamic attrs apply *after* rec and __overrides. */
|
||
for (auto & i : dynamicAttrs) {
|
||
Value nameVal;
|
||
i.nameExpr->eval(state, *dynamicEnv, nameVal);
|
||
state.forceValue(nameVal, i.pos);
|
||
if (nameVal.type == tNull)
|
||
continue;
|
||
state.forceStringNoCtx(nameVal);
|
||
Symbol nameSym = state.symbols.create(nameVal.string.s);
|
||
Bindings::iterator j = v.attrs->find(nameSym);
|
||
if (j != v.attrs->end())
|
||
throwEvalError("dynamic attribute ‘%1%’ at %2% already defined at %3%", nameSym, i.pos, *j->pos);
|
||
|
||
i.valueExpr->setName(nameSym);
|
||
/* Keep sorted order so find can catch duplicates */
|
||
v.attrs->push_back(Attr(nameSym, i.valueExpr->maybeThunk(state, *dynamicEnv), &i.pos));
|
||
v.attrs->sort(); // FIXME: inefficient
|
||
}
|
||
}
|
||
|
||
|
||
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()));
|
||
env2.up = &env;
|
||
|
||
/* The recursive attributes are evaluated in the new environment,
|
||
while the inherited attributes are evaluated in the original
|
||
environment. */
|
||
unsigned int displ = 0;
|
||
for (auto & i : attrs->attrs)
|
||
env2.values[displ++] = i.second.e->maybeThunk(state, i.second.inherited ? env : env2);
|
||
|
||
body->eval(state, env2, v);
|
||
}
|
||
|
||
|
||
void ExprList::eval(EvalState & state, Env & env, Value & v)
|
||
{
|
||
state.mkList(v, elems.size());
|
||
for (unsigned int n = 0; n < elems.size(); ++n)
|
||
v.listElems()[n] = elems[n]->maybeThunk(state, env);
|
||
}
|
||
|
||
|
||
void ExprVar::eval(EvalState & state, Env & env, Value & v)
|
||
{
|
||
Value * v2 = state.lookupVar(&env, *this, false);
|
||
state.forceValue(*v2, pos);
|
||
v = *v2;
|
||
}
|
||
|
||
|
||
static string showAttrPath(EvalState & state, Env & env, const AttrPath & attrPath)
|
||
{
|
||
std::ostringstream out;
|
||
bool first = true;
|
||
for (auto & i : attrPath) {
|
||
if (!first) out << '.'; else first = false;
|
||
try {
|
||
out << getName(i, state, env);
|
||
} catch (Error & e) {
|
||
assert(!i.symbol.set());
|
||
out << "\"${" << *i.expr << "}\"";
|
||
}
|
||
}
|
||
return out.str();
|
||
}
|
||
|
||
|
||
unsigned long nrLookups = 0;
|
||
|
||
void ExprSelect::eval(EvalState & state, Env & env, Value & v)
|
||
{
|
||
Value vTmp;
|
||
Pos * pos2 = 0;
|
||
Value * vAttrs = &vTmp;
|
||
|
||
e->eval(state, env, vTmp);
|
||
|
||
try {
|
||
|
||
for (auto & i : attrPath) {
|
||
nrLookups++;
|
||
Bindings::iterator j;
|
||
Symbol name = getName(i, state, env);
|
||
if (def) {
|
||
state.forceValue(*vAttrs, pos);
|
||
if (vAttrs->type != tAttrs ||
|
||
(j = vAttrs->attrs->find(name)) == vAttrs->attrs->end())
|
||
{
|
||
def->eval(state, env, v);
|
||
return;
|
||
}
|
||
} else {
|
||
state.forceAttrs(*vAttrs, pos);
|
||
if ((j = vAttrs->attrs->find(name)) == vAttrs->attrs->end())
|
||
throwEvalError("attribute ‘%1%’ missing, at %2%", name, pos);
|
||
}
|
||
vAttrs = j->value;
|
||
pos2 = j->pos;
|
||
if (state.countCalls && pos2) state.attrSelects[*pos2]++;
|
||
}
|
||
|
||
state.forceValue(*vAttrs, ( pos2 != NULL ? *pos2 : this->pos ) );
|
||
|
||
} catch (Error & e) {
|
||
if (pos2 && pos2->file != state.sDerivationNix)
|
||
addErrorPrefix(e, "while evaluating the attribute ‘%1%’ at %2%:\n",
|
||
showAttrPath(state, env, attrPath), *pos2);
|
||
throw;
|
||
}
|
||
|
||
v = *vAttrs;
|
||
}
|
||
|
||
|
||
void ExprOpHasAttr::eval(EvalState & state, Env & env, Value & v)
|
||
{
|
||
Value vTmp;
|
||
Value * vAttrs = &vTmp;
|
||
|
||
e->eval(state, env, vTmp);
|
||
|
||
for (auto & i : attrPath) {
|
||
state.forceValue(*vAttrs);
|
||
Bindings::iterator j;
|
||
Symbol name = getName(i, state, env);
|
||
if (vAttrs->type != tAttrs ||
|
||
(j = vAttrs->attrs->find(name)) == vAttrs->attrs->end())
|
||
{
|
||
mkBool(v, false);
|
||
return;
|
||
} else {
|
||
vAttrs = j->value;
|
||
}
|
||
}
|
||
|
||
mkBool(v, true);
|
||
}
|
||
|
||
|
||
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)
|
||
{
|
||
/* FIXME: vFun prevents GCC from doing tail call optimisation. */
|
||
Value vFun;
|
||
e1->eval(state, env, vFun);
|
||
state.callFunction(vFun, *(e2->maybeThunk(state, env)), v, pos);
|
||
}
|
||
|
||
|
||
void EvalState::callPrimOp(Value & fun, Value & arg, Value & v, const Pos & pos)
|
||
{
|
||
/* Figure out the number of arguments still needed. */
|
||
unsigned int argsDone = 0;
|
||
Value * primOp = &fun;
|
||
while (primOp->type == tPrimOpApp) {
|
||
argsDone++;
|
||
primOp = primOp->primOpApp.left;
|
||
}
|
||
assert(primOp->type == tPrimOp);
|
||
unsigned int arity = primOp->primOp->arity;
|
||
unsigned int argsLeft = arity - argsDone;
|
||
|
||
if (argsLeft == 1) {
|
||
/* We have all the arguments, so call the primop. */
|
||
|
||
/* 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. */
|
||
nrPrimOpCalls++;
|
||
if (countCalls) primOpCalls[primOp->primOp->name]++;
|
||
primOp->primOp->fun(*this, pos, vArgs, v);
|
||
} else {
|
||
Value * fun2 = allocValue();
|
||
*fun2 = fun;
|
||
v.type = tPrimOpApp;
|
||
v.primOpApp.left = fun2;
|
||
v.primOpApp.right = &arg;
|
||
}
|
||
}
|
||
|
||
|
||
void EvalState::callFunction(Value & fun, Value & arg, Value & v, const Pos & pos)
|
||
{
|
||
if (fun.type == tPrimOp || fun.type == tPrimOpApp) {
|
||
callPrimOp(fun, arg, v, pos);
|
||
return;
|
||
}
|
||
|
||
if (fun.type == tAttrs) {
|
||
auto found = fun.attrs->find(sFunctor);
|
||
if (found != fun.attrs->end()) {
|
||
/* fun may be allocated on the stack of the calling function,
|
||
* but for functors we may keep a reference, so heap-allocate
|
||
* a copy and use that instead.
|
||
*/
|
||
auto & fun2 = *allocValue();
|
||
fun2 = fun;
|
||
/* !!! Should we use the attr pos here? */
|
||
forceValue(*found->value, pos);
|
||
Value v2;
|
||
callFunction(*found->value, fun2, v2, pos);
|
||
forceValue(v2, pos);
|
||
return callFunction(v2, arg, v, pos);
|
||
}
|
||
}
|
||
|
||
if (fun.type != tLambda)
|
||
throwTypeError("attempt to call something which is not a function but %1%, at %2%", fun, pos);
|
||
|
||
ExprLambda & lambda(*fun.lambda.fun);
|
||
|
||
unsigned int size =
|
||
(lambda.arg.empty() ? 0 : 1) +
|
||
(lambda.matchAttrs ? lambda.formals->formals.size() : 0);
|
||
Env & env2(allocEnv(size));
|
||
env2.up = fun.lambda.env;
|
||
|
||
unsigned int displ = 0;
|
||
|
||
if (!lambda.matchAttrs)
|
||
env2.values[displ++] = &arg;
|
||
|
||
else {
|
||
forceAttrs(arg, pos);
|
||
|
||
if (!lambda.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;
|
||
for (auto & i : lambda.formals->formals) {
|
||
Bindings::iterator j = arg.attrs->find(i.name);
|
||
if (j == arg.attrs->end()) {
|
||
if (!i.def) throwTypeError("%1% called without required argument ‘%2%’, at %3%",
|
||
lambda, i.name, pos);
|
||
env2.values[displ++] = i.def->maybeThunk(*this, env2);
|
||
} else {
|
||
attrsUsed++;
|
||
env2.values[displ++] = j->value;
|
||
}
|
||
}
|
||
|
||
/* Check that each actual argument is listed as a formal
|
||
argument (unless the attribute match specifies a `...'). */
|
||
if (!lambda.formals->ellipsis && attrsUsed != arg.attrs->size()) {
|
||
/* Nope, so show the first unexpected argument to the
|
||
user. */
|
||
for (auto & i : *arg.attrs)
|
||
if (lambda.formals->argNames.find(i.name) == lambda.formals->argNames.end())
|
||
throwTypeError("%1% called with unexpected argument ‘%2%’, at %3%", lambda, i.name, pos);
|
||
abort(); // can't happen
|
||
}
|
||
}
|
||
|
||
nrFunctionCalls++;
|
||
if (countCalls) incrFunctionCall(&lambda);
|
||
|
||
/* Evaluate the body. This is conditional on showTrace, because
|
||
catching exceptions makes this function not tail-recursive. */
|
||
if (settings.showTrace)
|
||
try {
|
||
lambda.body->eval(*this, env2, v);
|
||
} catch (Error & e) {
|
||
addErrorPrefix(e, "while evaluating %1%, called from %2%:\n", lambda, pos);
|
||
throw;
|
||
}
|
||
else
|
||
fun.lambda.fun->body->eval(*this, env2, v);
|
||
}
|
||
|
||
|
||
// Lifted out of callFunction() because it creates a temporary that
|
||
// prevents tail-call optimisation.
|
||
void EvalState::incrFunctionCall(ExprLambda * fun)
|
||
{
|
||
functionCalls[fun]++;
|
||
}
|
||
|
||
|
||
void EvalState::autoCallFunction(Bindings & args, Value & fun, Value & res)
|
||
{
|
||
forceValue(fun);
|
||
|
||
if (fun.type == tAttrs) {
|
||
auto found = fun.attrs->find(sFunctor);
|
||
if (found != fun.attrs->end()) {
|
||
forceValue(*found->value);
|
||
Value * v = allocValue();
|
||
callFunction(*found->value, fun, *v, noPos);
|
||
forceValue(*v);
|
||
return autoCallFunction(args, *v, res);
|
||
}
|
||
}
|
||
|
||
if (fun.type != tLambda || !fun.lambda.fun->matchAttrs) {
|
||
res = fun;
|
||
return;
|
||
}
|
||
|
||
Value * actualArgs = allocValue();
|
||
mkAttrs(*actualArgs, fun.lambda.fun->formals->formals.size());
|
||
|
||
for (auto & i : fun.lambda.fun->formals->formals) {
|
||
Bindings::iterator j = args.find(i.name);
|
||
if (j != args.end())
|
||
actualArgs->attrs->push_back(*j);
|
||
else if (!i.def)
|
||
throwTypeError("cannot auto-call a function that has an argument without a default value (‘%1%’)", i.name);
|
||
}
|
||
|
||
actualArgs->attrs->sort();
|
||
|
||
callFunction(fun, *actualArgs, res, noPos);
|
||
}
|
||
|
||
|
||
void ExprWith::eval(EvalState & state, Env & env, Value & v)
|
||
{
|
||
Env & env2(state.allocEnv(1));
|
||
env2.up = &env;
|
||
env2.prevWith = prevWith;
|
||
env2.haveWithAttrs = false;
|
||
env2.values[0] = (Value *) attrs;
|
||
|
||
body->eval(state, env2, v);
|
||
}
|
||
|
||
|
||
void ExprIf::eval(EvalState & state, Env & env, Value & v)
|
||
{
|
||
(state.evalBool(env, cond) ? then : else_)->eval(state, env, v);
|
||
}
|
||
|
||
|
||
void ExprAssert::eval(EvalState & state, Env & env, Value & v)
|
||
{
|
||
if (!state.evalBool(env, cond, pos))
|
||
throwAssertionError("assertion failed at %1%", pos);
|
||
body->eval(state, env, 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; e1->eval(state, env, v1);
|
||
Value v2; e2->eval(state, env, v2);
|
||
mkBool(v, state.eqValues(v1, v2));
|
||
}
|
||
|
||
|
||
void ExprOpNEq::eval(EvalState & state, Env & env, Value & v)
|
||
{
|
||
Value v1; e1->eval(state, env, v1);
|
||
Value v2; e2->eval(state, env, v2);
|
||
mkBool(v, !state.eqValues(v1, v2));
|
||
}
|
||
|
||
|
||
void ExprOpAnd::eval(EvalState & state, Env & env, Value & v)
|
||
{
|
||
mkBool(v, state.evalBool(env, e1, pos) && state.evalBool(env, e2, pos));
|
||
}
|
||
|
||
|
||
void ExprOpOr::eval(EvalState & state, Env & env, Value & v)
|
||
{
|
||
mkBool(v, state.evalBool(env, e1, pos) || state.evalBool(env, e2, pos));
|
||
}
|
||
|
||
|
||
void ExprOpImpl::eval(EvalState & state, Env & env, Value & v)
|
||
{
|
||
mkBool(v, !state.evalBool(env, e1, pos) || state.evalBool(env, e2, pos));
|
||
}
|
||
|
||
|
||
void ExprOpUpdate::eval(EvalState & state, Env & env, Value & v)
|
||
{
|
||
Value v1, v2;
|
||
state.evalAttrs(env, e1, v1);
|
||
state.evalAttrs(env, e2, v2);
|
||
|
||
state.nrOpUpdates++;
|
||
|
||
if (v1.attrs->size() == 0) { v = v2; return; }
|
||
if (v2.attrs->size() == 0) { v = v1; return; }
|
||
|
||
state.mkAttrs(v, v1.attrs->size() + v2.attrs->size());
|
||
|
||
/* Merge the sets, preferring values from the second set. Make
|
||
sure to keep the resulting vector in sorted order. */
|
||
Bindings::iterator i = v1.attrs->begin();
|
||
Bindings::iterator j = v2.attrs->begin();
|
||
|
||
while (i != v1.attrs->end() && j != v2.attrs->end()) {
|
||
if (i->name == j->name) {
|
||
v.attrs->push_back(*j);
|
||
++i; ++j;
|
||
}
|
||
else if (i->name < j->name)
|
||
v.attrs->push_back(*i++);
|
||
else
|
||
v.attrs->push_back(*j++);
|
||
}
|
||
|
||
while (i != v1.attrs->end()) v.attrs->push_back(*i++);
|
||
while (j != v2.attrs->end()) v.attrs->push_back(*j++);
|
||
|
||
state.nrOpUpdateValuesCopied += v.attrs->size();
|
||
}
|
||
|
||
|
||
void ExprOpConcatLists::eval(EvalState & state, Env & env, Value & v)
|
||
{
|
||
Value v1; e1->eval(state, env, v1);
|
||
Value v2; e2->eval(state, env, v2);
|
||
Value * lists[2] = { &v1, &v2 };
|
||
state.concatLists(v, 2, lists, pos);
|
||
}
|
||
|
||
|
||
void EvalState::concatLists(Value & v, unsigned int nrLists, Value * * lists, const Pos & pos)
|
||
{
|
||
nrListConcats++;
|
||
|
||
Value * nonEmpty = 0;
|
||
unsigned int len = 0;
|
||
for (unsigned int n = 0; n < nrLists; ++n) {
|
||
forceList(*lists[n], pos);
|
||
unsigned int l = lists[n]->listSize();
|
||
len += l;
|
||
if (l) nonEmpty = lists[n];
|
||
}
|
||
|
||
if (nonEmpty && len == nonEmpty->listSize()) {
|
||
v = *nonEmpty;
|
||
return;
|
||
}
|
||
|
||
mkList(v, len);
|
||
auto out = v.listElems();
|
||
for (unsigned int n = 0, pos = 0; n < nrLists; ++n) {
|
||
unsigned int l = lists[n]->listSize();
|
||
memcpy(out + pos, lists[n]->listElems(), l * sizeof(Value *));
|
||
pos += l;
|
||
}
|
||
}
|
||
|
||
|
||
void ExprConcatStrings::eval(EvalState & state, Env & env, Value & v)
|
||
{
|
||
PathSet context;
|
||
std::ostringstream s;
|
||
NixInt n = 0;
|
||
NixFloat nf = 0;
|
||
|
||
bool first = !forceString;
|
||
ValueType firstType = tString;
|
||
|
||
for (auto & i : *es) {
|
||
Value vTmp;
|
||
i->eval(state, env, vTmp);
|
||
|
||
/* 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) {
|
||
firstType = vTmp.type;
|
||
first = false;
|
||
}
|
||
|
||
if (firstType == tInt) {
|
||
if (vTmp.type == tInt) {
|
||
n += vTmp.integer;
|
||
} else if (vTmp.type == tFloat) {
|
||
// Upgrade the type from int to float;
|
||
firstType = tFloat;
|
||
nf = n;
|
||
nf += vTmp.fpoint;
|
||
} else
|
||
throwEvalError("cannot add %1% to an integer, at %2%", showType(vTmp), pos);
|
||
} else if (firstType == tFloat) {
|
||
if (vTmp.type == tInt) {
|
||
nf += vTmp.integer;
|
||
} else if (vTmp.type == tFloat) {
|
||
nf += vTmp.fpoint;
|
||
} else
|
||
throwEvalError("cannot add %1% to a float, at %2%", showType(vTmp), pos);
|
||
} else
|
||
s << state.coerceToString(pos, vTmp, context, false, firstType == tString);
|
||
}
|
||
|
||
if (firstType == tInt)
|
||
mkInt(v, n);
|
||
else if (firstType == tFloat)
|
||
mkFloat(v, nf);
|
||
else if (firstType == tPath) {
|
||
if (!context.empty())
|
||
throwEvalError("a string that refers to a store path cannot be appended to a path, at %1%", pos);
|
||
auto path = canonPath(s.str());
|
||
mkPath(v, path.c_str());
|
||
} else
|
||
mkString(v, s.str(), context);
|
||
}
|
||
|
||
|
||
void ExprPos::eval(EvalState & state, Env & env, Value & v)
|
||
{
|
||
state.mkPos(v, &pos);
|
||
}
|
||
|
||
|
||
void EvalState::forceValueDeep(Value & v)
|
||
{
|
||
std::set<const Value *> seen;
|
||
|
||
std::function<void(Value & v)> recurse;
|
||
|
||
recurse = [&](Value & v) {
|
||
if (seen.find(&v) != seen.end()) return;
|
||
seen.insert(&v);
|
||
|
||
forceValue(v);
|
||
|
||
if (v.type == tAttrs) {
|
||
for (auto & i : *v.attrs)
|
||
try {
|
||
recurse(*i.value);
|
||
} catch (Error & e) {
|
||
addErrorPrefix(e, "while evaluating the attribute ‘%1%’ at %2%:\n", i.name, *i.pos);
|
||
throw;
|
||
}
|
||
}
|
||
|
||
else if (v.isList()) {
|
||
for (unsigned int n = 0; n < v.listSize(); ++n)
|
||
recurse(*v.listElems()[n]);
|
||
}
|
||
};
|
||
|
||
recurse(v);
|
||
}
|
||
|
||
|
||
NixInt EvalState::forceInt(Value & v, const Pos & pos)
|
||
{
|
||
forceValue(v, pos);
|
||
if (v.type != tInt)
|
||
throwTypeError("value is %1% while an integer was expected, at %2%", v, pos);
|
||
return v.integer;
|
||
}
|
||
|
||
|
||
NixFloat EvalState::forceFloat(Value & v, const Pos & pos)
|
||
{
|
||
forceValue(v, pos);
|
||
if (v.type == tInt)
|
||
return v.integer;
|
||
else if (v.type != tFloat)
|
||
throwTypeError("value is %1% while a float was expected, at %2%", v, pos);
|
||
return v.fpoint;
|
||
}
|
||
|
||
|
||
bool EvalState::forceBool(Value & v, const Pos & pos)
|
||
{
|
||
forceValue(v);
|
||
if (v.type != tBool)
|
||
throwTypeError("value is %1% while a Boolean was expected, at %2%", v, pos);
|
||
return v.boolean;
|
||
}
|
||
|
||
|
||
bool EvalState::isFunctor(Value & fun)
|
||
{
|
||
return fun.type == tAttrs && fun.attrs->find(sFunctor) != fun.attrs->end();
|
||
}
|
||
|
||
|
||
void EvalState::forceFunction(Value & v, const Pos & pos)
|
||
{
|
||
forceValue(v);
|
||
if (v.type != tLambda && v.type != tPrimOp && v.type != tPrimOpApp && !isFunctor(v))
|
||
throwTypeError("value is %1% while a function was expected, at %2%", v, pos);
|
||
}
|
||
|
||
|
||
string EvalState::forceString(Value & v, const Pos & pos)
|
||
{
|
||
forceValue(v, pos);
|
||
if (v.type != tString) {
|
||
if (pos)
|
||
throwTypeError("value is %1% while a string was expected, at %2%", v, pos);
|
||
else
|
||
throwTypeError("value is %1% while a string was expected", v);
|
||
}
|
||
return string(v.string.s);
|
||
}
|
||
|
||
|
||
void copyContext(const Value & v, PathSet & context)
|
||
{
|
||
if (v.string.context)
|
||
for (const char * * p = v.string.context; *p; ++p)
|
||
context.insert(*p);
|
||
}
|
||
|
||
|
||
string EvalState::forceString(Value & v, PathSet & context, const Pos & pos)
|
||
{
|
||
string s = forceString(v, pos);
|
||
copyContext(v, context);
|
||
return s;
|
||
}
|
||
|
||
|
||
string EvalState::forceStringNoCtx(Value & v, const Pos & pos)
|
||
{
|
||
string s = forceString(v, pos);
|
||
if (v.string.context) {
|
||
if (pos)
|
||
throwEvalError("the string ‘%1%’ is not allowed to refer to a store path (such as ‘%2%’), at %3%",
|
||
v.string.s, v.string.context[0], pos);
|
||
else
|
||
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);
|
||
if (i == v.attrs->end()) return false;
|
||
forceValue(*i->value);
|
||
if (i->value->type != tString) return false;
|
||
return strcmp(i->value->string.s, "derivation") == 0;
|
||
}
|
||
|
||
|
||
string EvalState::coerceToString(const Pos & pos, Value & v, PathSet & context,
|
||
bool coerceMore, bool copyToStore)
|
||
{
|
||
forceValue(v);
|
||
|
||
string s;
|
||
|
||
if (v.type == tString) {
|
||
copyContext(v, context);
|
||
return v.string.s;
|
||
}
|
||
|
||
if (v.type == tPath) {
|
||
Path path(canonPath(v.path));
|
||
return copyToStore ? copyPathToStore(context, path) : path;
|
||
}
|
||
|
||
if (v.type == tAttrs) {
|
||
auto i = v.attrs->find(sToString);
|
||
if (i != v.attrs->end()) {
|
||
forceValue(*i->value, pos);
|
||
Value v1;
|
||
callFunction(*i->value, v, v1, pos);
|
||
return coerceToString(pos, v1, context, coerceMore, copyToStore);
|
||
}
|
||
i = v.attrs->find(sOutPath);
|
||
if (i == v.attrs->end()) throwTypeError("cannot coerce a set to a string, at %1%", pos);
|
||
return coerceToString(pos, *i->value, context, coerceMore, copyToStore);
|
||
}
|
||
|
||
if (v.type == tExternal)
|
||
return v.external->coerceToString(pos, 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 std::to_string(v.integer);
|
||
if (v.type == tFloat) return std::to_string(v.fpoint);
|
||
if (v.type == tNull) return "";
|
||
|
||
if (v.isList()) {
|
||
string result;
|
||
for (unsigned int n = 0; n < v.listSize(); ++n) {
|
||
result += coerceToString(pos, *v.listElems()[n],
|
||
context, coerceMore, copyToStore);
|
||
if (n < v.listSize() - 1
|
||
/* !!! not quite correct */
|
||
&& (!v.listElems()[n]->isList() || v.listElems()[n]->listSize() != 0))
|
||
result += " ";
|
||
}
|
||
return result;
|
||
}
|
||
}
|
||
|
||
throwTypeError("cannot coerce %1% to a string, at %2%", v, pos);
|
||
}
|
||
|
||
|
||
string EvalState::copyPathToStore(PathSet & context, const Path & 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 = settings.readOnlyMode
|
||
? store->computeStorePathForPath(checkSourcePath(path)).first
|
||
: store->addToStore(baseNameOf(path), checkSourcePath(path), true, htSHA256, defaultPathFilter, repair);
|
||
srcToStore[path] = dstPath;
|
||
printMsg(lvlChatty, format("copied source ‘%1%’ -> ‘%2%’")
|
||
% path % dstPath);
|
||
}
|
||
|
||
context.insert(dstPath);
|
||
return dstPath;
|
||
}
|
||
|
||
|
||
Path EvalState::coerceToPath(const Pos & pos, Value & v, PathSet & context)
|
||
{
|
||
string path = coerceToString(pos, v, context, false, false);
|
||
if (path == "" || path[0] != '/')
|
||
throwEvalError("string ‘%1%’ doesn't represent an absolute path, at %2%", path, pos);
|
||
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 sets. (Specifically, builderDefs calls
|
||
uniqList on a list of sets.) Will remove this eventually. */
|
||
if (&v1 == &v2) return true;
|
||
|
||
// Special case type-compatibility between float and int
|
||
if (v1.type == tInt && v2.type == tFloat)
|
||
return v1.integer == v2.fpoint;
|
||
if (v1.type == tFloat && v2.type == tInt)
|
||
return v1.fpoint == v2.integer;
|
||
|
||
// All other types are not compatible with each other.
|
||
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:
|
||
return strcmp(v1.string.s, v2.string.s) == 0;
|
||
|
||
case tPath:
|
||
return strcmp(v1.path, v2.path) == 0;
|
||
|
||
case tNull:
|
||
return true;
|
||
|
||
case tList1:
|
||
case tList2:
|
||
case tListN:
|
||
if (v1.listSize() != v2.listSize()) return false;
|
||
for (unsigned int n = 0; n < v1.listSize(); ++n)
|
||
if (!eqValues(*v1.listElems()[n], *v2.listElems()[n])) return false;
|
||
return true;
|
||
|
||
case tAttrs: {
|
||
/* If both sets denote a derivation (type = "derivation"),
|
||
then compare their outPaths. */
|
||
if (isDerivation(v1) && isDerivation(v2)) {
|
||
Bindings::iterator i = v1.attrs->find(sOutPath);
|
||
Bindings::iterator j = v2.attrs->find(sOutPath);
|
||
if (i != v1.attrs->end() && j != v2.attrs->end())
|
||
return eqValues(*i->value, *j->value);
|
||
}
|
||
|
||
if (v1.attrs->size() != v2.attrs->size()) return false;
|
||
|
||
/* Otherwise, compare the attributes one by one. */
|
||
Bindings::iterator i, j;
|
||
for (i = v1.attrs->begin(), j = v2.attrs->begin(); i != v1.attrs->end(); ++i, ++j)
|
||
if (i->name != j->name || !eqValues(*i->value, *j->value))
|
||
return false;
|
||
|
||
return true;
|
||
}
|
||
|
||
/* Functions are incomparable. */
|
||
case tLambda:
|
||
case tPrimOp:
|
||
case tPrimOpApp:
|
||
return false;
|
||
|
||
case tExternal:
|
||
return *v1.external == *v2.external;
|
||
|
||
case tFloat:
|
||
return v1.fpoint == v2.fpoint;
|
||
|
||
default:
|
||
throwEvalError("cannot compare %1% with %2%", showType(v1), showType(v2));
|
||
}
|
||
}
|
||
|
||
|
||
void EvalState::printStats()
|
||
{
|
||
bool showStats = getEnv("NIX_SHOW_STATS", "0") != "0";
|
||
Verbosity v = showStats ? lvlInfo : lvlDebug;
|
||
printMsg(v, "evaluation statistics:");
|
||
|
||
struct rusage buf;
|
||
getrusage(RUSAGE_SELF, &buf);
|
||
float cpuTime = buf.ru_utime.tv_sec + ((float) buf.ru_utime.tv_usec / 1000000);
|
||
|
||
uint64_t bEnvs = nrEnvs * sizeof(Env) + nrValuesInEnvs * sizeof(Value *);
|
||
uint64_t bLists = nrListElems * sizeof(Value *);
|
||
uint64_t bValues = nrValues * sizeof(Value);
|
||
uint64_t bAttrsets = nrAttrsets * sizeof(Bindings) + nrAttrsInAttrsets * sizeof(Attr);
|
||
|
||
printMsg(v, format(" time elapsed: %1%") % cpuTime);
|
||
printMsg(v, format(" size of a value: %1%") % sizeof(Value));
|
||
printMsg(v, format(" size of an attr: %1%") % sizeof(Attr));
|
||
printMsg(v, format(" environments allocated: %1% (%2% bytes)") % nrEnvs % bEnvs);
|
||
printMsg(v, format(" list elements: %1% (%2% bytes)") % nrListElems % bLists);
|
||
printMsg(v, format(" list concatenations: %1%") % nrListConcats);
|
||
printMsg(v, format(" values allocated: %1% (%2% bytes)") % nrValues % bValues);
|
||
printMsg(v, format(" sets allocated: %1% (%2% bytes)") % nrAttrsets % bAttrsets);
|
||
printMsg(v, format(" right-biased unions: %1%") % nrOpUpdates);
|
||
printMsg(v, format(" values copied in right-biased unions: %1%") % nrOpUpdateValuesCopied);
|
||
printMsg(v, format(" symbols in symbol table: %1%") % symbols.size());
|
||
printMsg(v, format(" size of symbol table: %1%") % symbols.totalSize());
|
||
printMsg(v, format(" number of thunks: %1%") % nrThunks);
|
||
printMsg(v, format(" number of thunks avoided: %1%") % nrAvoided);
|
||
printMsg(v, format(" number of attr lookups: %1%") % nrLookups);
|
||
printMsg(v, format(" number of primop calls: %1%") % nrPrimOpCalls);
|
||
printMsg(v, format(" number of function calls: %1%") % nrFunctionCalls);
|
||
printMsg(v, format(" total allocations: %1% bytes") % (bEnvs + bLists + bValues + bAttrsets));
|
||
|
||
#if HAVE_BOEHMGC
|
||
GC_word heapSize, totalBytes;
|
||
GC_get_heap_usage_safe(&heapSize, 0, 0, 0, &totalBytes);
|
||
printMsg(v, format(" current Boehm heap size: %1% bytes") % heapSize);
|
||
printMsg(v, format(" total Boehm heap allocations: %1% bytes") % totalBytes);
|
||
#endif
|
||
|
||
if (countCalls) {
|
||
v = lvlInfo;
|
||
|
||
printMsg(v, format("calls to %1% primops:") % primOpCalls.size());
|
||
typedef std::multimap<unsigned int, Symbol> PrimOpCalls_;
|
||
PrimOpCalls_ primOpCalls_;
|
||
for (auto & i : primOpCalls)
|
||
primOpCalls_.insert(std::pair<unsigned int, Symbol>(i.second, i.first));
|
||
for (auto i = primOpCalls_.rbegin(); i != primOpCalls_.rend(); ++i)
|
||
printMsg(v, format("%1$10d %2%") % i->first % i->second);
|
||
|
||
printMsg(v, format("calls to %1% functions:") % functionCalls.size());
|
||
typedef std::multimap<unsigned int, ExprLambda *> FunctionCalls_;
|
||
FunctionCalls_ functionCalls_;
|
||
for (auto & i : functionCalls)
|
||
functionCalls_.insert(std::pair<unsigned int, ExprLambda *>(i.second, i.first));
|
||
for (auto i = functionCalls_.rbegin(); i != functionCalls_.rend(); ++i)
|
||
printMsg(v, format("%1$10d %2%") % i->first % i->second->showNamePos());
|
||
|
||
printMsg(v, format("evaluations of %1% attributes:") % attrSelects.size());
|
||
typedef std::multimap<unsigned int, Pos> AttrSelects_;
|
||
AttrSelects_ attrSelects_;
|
||
for (auto & i : attrSelects)
|
||
attrSelects_.insert(std::pair<unsigned int, Pos>(i.second, i.first));
|
||
for (auto i = attrSelects_.rbegin(); i != attrSelects_.rend(); ++i)
|
||
printMsg(v, format("%1$10d %2%") % i->first % i->second);
|
||
|
||
}
|
||
}
|
||
|
||
|
||
size_t valueSize(Value & v)
|
||
{
|
||
std::set<const void *> seen;
|
||
|
||
auto doString = [&](const char * s) -> size_t {
|
||
if (seen.find(s) != seen.end()) return 0;
|
||
seen.insert(s);
|
||
return strlen(s) + 1;
|
||
};
|
||
|
||
std::function<size_t(Value & v)> doValue;
|
||
std::function<size_t(Env & v)> doEnv;
|
||
|
||
doValue = [&](Value & v) -> size_t {
|
||
if (seen.find(&v) != seen.end()) return 0;
|
||
seen.insert(&v);
|
||
|
||
size_t sz = sizeof(Value);
|
||
|
||
switch (v.type) {
|
||
case tString:
|
||
sz += doString(v.string.s);
|
||
if (v.string.context)
|
||
for (const char * * p = v.string.context; *p; ++p)
|
||
sz += doString(*p);
|
||
break;
|
||
case tPath:
|
||
sz += doString(v.path);
|
||
break;
|
||
case tAttrs:
|
||
if (seen.find(v.attrs) == seen.end()) {
|
||
seen.insert(v.attrs);
|
||
sz += sizeof(Bindings) + sizeof(Attr) * v.attrs->capacity();
|
||
for (auto & i : *v.attrs)
|
||
sz += doValue(*i.value);
|
||
}
|
||
break;
|
||
case tList1:
|
||
case tList2:
|
||
case tListN:
|
||
if (seen.find(v.listElems()) == seen.end()) {
|
||
seen.insert(v.listElems());
|
||
sz += v.listSize() * sizeof(Value *);
|
||
for (unsigned int n = 0; n < v.listSize(); ++n)
|
||
sz += doValue(*v.listElems()[n]);
|
||
}
|
||
break;
|
||
case tThunk:
|
||
sz += doEnv(*v.thunk.env);
|
||
break;
|
||
case tApp:
|
||
sz += doValue(*v.app.left);
|
||
sz += doValue(*v.app.right);
|
||
break;
|
||
case tLambda:
|
||
sz += doEnv(*v.lambda.env);
|
||
break;
|
||
case tPrimOpApp:
|
||
sz += doValue(*v.primOpApp.left);
|
||
sz += doValue(*v.primOpApp.right);
|
||
break;
|
||
case tExternal:
|
||
if (seen.find(v.external) != seen.end()) break;
|
||
seen.insert(v.external);
|
||
sz += v.external->valueSize(seen);
|
||
break;
|
||
default:
|
||
;
|
||
}
|
||
|
||
return sz;
|
||
};
|
||
|
||
doEnv = [&](Env & env) -> size_t {
|
||
if (seen.find(&env) != seen.end()) return 0;
|
||
seen.insert(&env);
|
||
|
||
size_t sz = sizeof(Env) + sizeof(Value *) * env.size;
|
||
|
||
for (unsigned int i = 0; i < env.size; ++i)
|
||
if (env.values[i])
|
||
sz += doValue(*env.values[i]);
|
||
|
||
if (env.up) sz += doEnv(*env.up);
|
||
|
||
return sz;
|
||
};
|
||
|
||
return doValue(v);
|
||
}
|
||
|
||
|
||
string ExternalValueBase::coerceToString(const Pos & pos, PathSet & context, bool copyMore, bool copyToStore) const
|
||
{
|
||
throw TypeError(format("cannot coerce %1% to a string, at %2%") %
|
||
showType() % pos);
|
||
}
|
||
|
||
|
||
bool ExternalValueBase::operator==(const ExternalValueBase & b) const
|
||
{
|
||
return false;
|
||
}
|
||
|
||
|
||
std::ostream & operator << (std::ostream & str, const ExternalValueBase & v) {
|
||
return v.print(str);
|
||
}
|
||
|
||
|
||
}
|