mirror of
https://github.com/NixOS/nix
synced 2024-09-20 23:28:26 -04:00
2385 lines
70 KiB
C++
2385 lines
70 KiB
C++
#include "eval.hh"
|
||
#include "hash.hh"
|
||
#include "types.hh"
|
||
#include "util.hh"
|
||
#include "store-api.hh"
|
||
#include "derivations.hh"
|
||
#include "globals.hh"
|
||
#include "eval-inline.hh"
|
||
#include "filetransfer.hh"
|
||
#include "json.hh"
|
||
#include "function-trace.hh"
|
||
|
||
#include <algorithm>
|
||
#include <chrono>
|
||
#include <cstring>
|
||
#include <unistd.h>
|
||
#include <sys/time.h>
|
||
#include <sys/resource.h>
|
||
#include <iostream>
|
||
#include <fstream>
|
||
|
||
#include <sys/resource.h>
|
||
|
||
#if HAVE_BOEHMGC
|
||
|
||
#define GC_INCLUDE_NEW
|
||
|
||
#include <gc/gc.h>
|
||
#include <gc/gc_cpp.h>
|
||
|
||
#include <boost/coroutine2/coroutine.hpp>
|
||
#include <boost/coroutine2/protected_fixedsize_stack.hpp>
|
||
#include <boost/context/stack_context.hpp>
|
||
|
||
#endif
|
||
|
||
namespace nix {
|
||
|
||
|
||
static char * allocString(size_t size)
|
||
{
|
||
char * t;
|
||
#if HAVE_BOEHMGC
|
||
t = (char *) GC_MALLOC_ATOMIC(size);
|
||
#else
|
||
t = malloc(size);
|
||
#endif
|
||
if (!t) throw std::bad_alloc();
|
||
return t;
|
||
}
|
||
|
||
|
||
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;
|
||
}
|
||
|
||
|
||
// When there's no need to write to the string, we can optimize away empty
|
||
// string allocations.
|
||
// This function handles makeImmutableStringWithLen(null, 0) by returning the
|
||
// empty string.
|
||
static const char * makeImmutableStringWithLen(const char * s, size_t size)
|
||
{
|
||
char * t;
|
||
if (size == 0)
|
||
return "";
|
||
#if HAVE_BOEHMGC
|
||
t = GC_STRNDUP(s, size);
|
||
#else
|
||
t = strndup(s, size);
|
||
#endif
|
||
if (!t) throw std::bad_alloc();
|
||
return t;
|
||
}
|
||
|
||
static inline const char * makeImmutableString(std::string_view s) {
|
||
return makeImmutableStringWithLen(s.data(), s.size());
|
||
}
|
||
|
||
|
||
RootValue allocRootValue(Value * v)
|
||
{
|
||
#if HAVE_BOEHMGC
|
||
return std::allocate_shared<Value *>(traceable_allocator<Value *>(), v);
|
||
#else
|
||
return std::make_shared<Value *>(v);
|
||
#endif
|
||
}
|
||
|
||
|
||
void printValue(std::ostream & str, std::set<const void *> & seen, const Value & v)
|
||
{
|
||
checkInterrupt();
|
||
|
||
switch (v.internalType) {
|
||
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 if (*i == '$' && *(i+1) == '{') str << "\\" << *i;
|
||
else str << *i;
|
||
str << "\"";
|
||
break;
|
||
case tPath:
|
||
str << v.path; // !!! escaping?
|
||
break;
|
||
case tNull:
|
||
str << "null";
|
||
break;
|
||
case tAttrs: {
|
||
if (!v.attrs->empty() && !seen.insert(v.attrs).second)
|
||
str << "<REPEAT>";
|
||
else {
|
||
str << "{ ";
|
||
for (auto & i : v.attrs->lexicographicOrder()) {
|
||
str << i->name << " = ";
|
||
printValue(str, seen, *i->value);
|
||
str << "; ";
|
||
}
|
||
str << "}";
|
||
}
|
||
break;
|
||
}
|
||
case tList1:
|
||
case tList2:
|
||
case tListN:
|
||
if (v.listSize() && !seen.insert(v.listElems()).second)
|
||
str << "<REPEAT>";
|
||
else {
|
||
str << "[ ";
|
||
for (auto v2 : v.listItems()) {
|
||
printValue(str, seen, *v2);
|
||
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:
|
||
abort();
|
||
}
|
||
}
|
||
|
||
|
||
std::ostream & operator << (std::ostream & str, const Value & v)
|
||
{
|
||
std::set<const void *> seen;
|
||
printValue(str, seen, v);
|
||
return str;
|
||
}
|
||
|
||
|
||
const Value * getPrimOp(const Value &v) {
|
||
const Value * primOp = &v;
|
||
while (primOp->isPrimOpApp()) {
|
||
primOp = primOp->primOpApp.left;
|
||
}
|
||
assert(primOp->isPrimOp());
|
||
return primOp;
|
||
}
|
||
|
||
std::string_view showType(ValueType type)
|
||
{
|
||
switch (type) {
|
||
case nInt: return "an integer";
|
||
case nBool: return "a Boolean";
|
||
case nString: return "a string";
|
||
case nPath: return "a path";
|
||
case nNull: return "null";
|
||
case nAttrs: return "a set";
|
||
case nList: return "a list";
|
||
case nFunction: return "a function";
|
||
case nExternal: return "an external value";
|
||
case nFloat: return "a float";
|
||
case nThunk: return "a thunk";
|
||
}
|
||
abort();
|
||
}
|
||
|
||
|
||
std::string showType(const Value & v)
|
||
{
|
||
switch (v.internalType) {
|
||
case tString: return v.string.context ? "a string with context" : "a string";
|
||
case tPrimOp:
|
||
return fmt("the built-in function '%s'", std::string(v.primOp->name));
|
||
case tPrimOpApp:
|
||
return fmt("the partially applied built-in function '%s'", std::string(getPrimOp(v)->primOp->name));
|
||
case tExternal: return v.external->showType();
|
||
case tThunk: return "a thunk";
|
||
case tApp: return "a function application";
|
||
case tBlackhole: return "a black hole";
|
||
default:
|
||
return std::string(showType(v.type()));
|
||
}
|
||
}
|
||
|
||
Pos Value::determinePos(const Pos & pos) const
|
||
{
|
||
switch (internalType) {
|
||
case tAttrs: return *attrs->pos;
|
||
case tLambda: return lambda.fun->pos;
|
||
case tApp: return app.left->determinePos(pos);
|
||
default: return pos;
|
||
}
|
||
}
|
||
|
||
bool Value::isTrivial() const
|
||
{
|
||
return
|
||
internalType != tApp
|
||
&& internalType != tPrimOpApp
|
||
&& (internalType != tThunk
|
||
|| (dynamic_cast<ExprAttrs *>(thunk.expr)
|
||
&& ((ExprAttrs *) thunk.expr)->dynamicAttrs.empty())
|
||
|| dynamic_cast<ExprLambda *>(thunk.expr)
|
||
|| dynamic_cast<ExprList *>(thunk.expr));
|
||
}
|
||
|
||
|
||
#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();
|
||
}
|
||
|
||
class BoehmGCStackAllocator : public StackAllocator {
|
||
boost::coroutines2::protected_fixedsize_stack stack {
|
||
// We allocate 8 MB, the default max stack size on NixOS.
|
||
// A smaller stack might be quicker to allocate but reduces the stack
|
||
// depth available for source filter expressions etc.
|
||
std::max(boost::context::stack_traits::default_size(), static_cast<std::size_t>(8 * 1024 * 1024))
|
||
};
|
||
|
||
// This is specific to boost::coroutines2::protected_fixedsize_stack.
|
||
// The stack protection page is included in sctx.size, so we have to
|
||
// subtract one page size from the stack size.
|
||
std::size_t pfss_usable_stack_size(boost::context::stack_context &sctx) {
|
||
return sctx.size - boost::context::stack_traits::page_size();
|
||
}
|
||
|
||
public:
|
||
boost::context::stack_context allocate() override {
|
||
auto sctx = stack.allocate();
|
||
|
||
// Stacks generally start at a high address and grow to lower addresses.
|
||
// Architectures that do the opposite are rare; in fact so rare that
|
||
// boost_routine does not implement it.
|
||
// So we subtract the stack size.
|
||
GC_add_roots(static_cast<char *>(sctx.sp) - pfss_usable_stack_size(sctx), sctx.sp);
|
||
return sctx;
|
||
}
|
||
|
||
void deallocate(boost::context::stack_context sctx) override {
|
||
GC_remove_roots(static_cast<char *>(sctx.sp) - pfss_usable_stack_size(sctx), sctx.sp);
|
||
stack.deallocate(sctx);
|
||
}
|
||
|
||
};
|
||
|
||
static BoehmGCStackAllocator boehmGCStackAllocator;
|
||
|
||
#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, noPos, "While evaluating an attribute name");
|
||
return state.symbols.create(nameValue.string.s);
|
||
}
|
||
}
|
||
|
||
|
||
static bool gcInitialised = false;
|
||
|
||
void initGC()
|
||
{
|
||
if (gcInitialised) return;
|
||
|
||
#if HAVE_BOEHMGC
|
||
/* Initialise the Boehm garbage collector. */
|
||
|
||
/* Don't look for interior pointers. This reduces the odds of
|
||
misdetection a bit. */
|
||
GC_set_all_interior_pointers(0);
|
||
|
||
/* We don't have any roots in data segments, so don't scan from
|
||
there. */
|
||
GC_set_no_dls(1);
|
||
|
||
GC_INIT();
|
||
|
||
GC_set_oom_fn(oomHandler);
|
||
|
||
StackAllocator::defaultAllocator = &boehmGCStackAllocator;
|
||
|
||
/* 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 std::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,
|
||
std::shared_ptr<Store> buildStore)
|
||
: 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"))
|
||
, sArgs(symbols.create("args"))
|
||
, sContentAddressed(symbols.create("__contentAddressed"))
|
||
, sOutputHash(symbols.create("outputHash"))
|
||
, sOutputHashAlgo(symbols.create("outputHashAlgo"))
|
||
, sOutputHashMode(symbols.create("outputHashMode"))
|
||
, sRecurseForDerivations(symbols.create("recurseForDerivations"))
|
||
, sDescription(symbols.create("description"))
|
||
, sSelf(symbols.create("self"))
|
||
, sEpsilon(symbols.create(""))
|
||
, sStartSet(symbols.create("startSet"))
|
||
, sOperator(symbols.create("operator"))
|
||
, sKey(symbols.create("key"))
|
||
, sPath(symbols.create("path"))
|
||
, sPrefix(symbols.create("prefix"))
|
||
, repair(NoRepair)
|
||
, emptyBindings(0)
|
||
, store(store)
|
||
, buildStore(buildStore ? buildStore : store)
|
||
, regexCache(makeRegexCache())
|
||
#if HAVE_BOEHMGC
|
||
, valueAllocCache(std::allocate_shared<void *>(traceable_allocator<void *>(), nullptr))
|
||
, env1AllocCache(std::allocate_shared<void *>(traceable_allocator<void *>(), nullptr))
|
||
#else
|
||
, valueAllocCache(std::make_shared<void *>(nullptr))
|
||
, env1AllocCache(std::make_shared<void *>(nullptr))
|
||
#endif
|
||
, baseEnv(allocEnv(128))
|
||
, staticBaseEnv(false, 0)
|
||
{
|
||
countCalls = getEnv("NIX_COUNT_CALLS").value_or("0") != "0";
|
||
|
||
assert(gcInitialised);
|
||
|
||
static_assert(sizeof(Env) <= 16, "environment must be <= 16 bytes");
|
||
|
||
/* Initialise the Nix expression search path. */
|
||
if (!evalSettings.pureEval) {
|
||
for (auto & i : _searchPath) addToSearchPath(i);
|
||
for (auto & i : evalSettings.nixPath.get()) addToSearchPath(i);
|
||
}
|
||
|
||
if (evalSettings.restrictEval || evalSettings.pureEval) {
|
||
allowedPaths = PathSet();
|
||
|
||
for (auto & i : searchPath) {
|
||
auto r = resolveSearchPathElem(i);
|
||
if (!r.first) continue;
|
||
|
||
auto path = r.second;
|
||
|
||
if (store->isInStore(r.second)) {
|
||
try {
|
||
StorePathSet closure;
|
||
store->computeFSClosure(store->toStorePath(r.second).first, closure);
|
||
for (auto & path : closure)
|
||
allowPath(path);
|
||
} catch (InvalidPath &) {
|
||
allowPath(r.second);
|
||
}
|
||
} else
|
||
allowPath(r.second);
|
||
}
|
||
}
|
||
|
||
createBaseEnv();
|
||
}
|
||
|
||
|
||
EvalState::~EvalState()
|
||
{
|
||
}
|
||
|
||
|
||
void EvalState::requireExperimentalFeatureOnEvaluation(
|
||
const ExperimentalFeature & feature,
|
||
const std::string_view fName,
|
||
const Pos & pos)
|
||
{
|
||
if (!settings.isExperimentalFeatureEnabled(feature)) {
|
||
throw EvalError({
|
||
.msg = hintfmt(
|
||
"Cannot call '%2%' because experimental Nix feature '%1%' is disabled. You can enable it via '--extra-experimental-features %1%'.",
|
||
feature,
|
||
fName
|
||
),
|
||
.errPos = pos
|
||
});
|
||
}
|
||
}
|
||
|
||
void EvalState::allowPath(const Path & path)
|
||
{
|
||
if (allowedPaths)
|
||
allowedPaths->insert(path);
|
||
}
|
||
|
||
void EvalState::allowPath(const StorePath & storePath)
|
||
{
|
||
if (allowedPaths)
|
||
allowedPaths->insert(store->toRealPath(storePath));
|
||
}
|
||
|
||
void EvalState::allowAndSetStorePathString(const StorePath &storePath, Value & v)
|
||
{
|
||
allowPath(storePath);
|
||
|
||
auto path = store->printStorePath(storePath);
|
||
v.mkString(path, PathSet({path}));
|
||
}
|
||
|
||
Path EvalState::checkSourcePath(const Path & path_)
|
||
{
|
||
if (!allowedPaths) return path_;
|
||
|
||
auto i = resolvedPaths.find(path_);
|
||
if (i != resolvedPaths.end())
|
||
return i->second;
|
||
|
||
bool found = false;
|
||
|
||
/* First canonicalize the path without symlinks, so we make sure an
|
||
* attacker can't append ../../... to a path that would be in allowedPaths
|
||
* and thus leak symlink targets.
|
||
*/
|
||
Path abspath = canonPath(path_);
|
||
|
||
if (hasPrefix(abspath, corepkgsPrefix)) return abspath;
|
||
|
||
for (auto & i : *allowedPaths) {
|
||
if (isDirOrInDir(abspath, i)) {
|
||
found = true;
|
||
break;
|
||
}
|
||
}
|
||
|
||
if (!found) {
|
||
auto modeInformation = evalSettings.pureEval
|
||
? "in pure eval mode (use '--impure' to override)"
|
||
: "in restricted mode";
|
||
throw RestrictedPathError("access to absolute path '%1%' is forbidden %2%", abspath, modeInformation);
|
||
}
|
||
|
||
/* Resolve symlinks. */
|
||
debug(format("checking access to '%s'") % abspath);
|
||
Path path = canonPath(abspath, true);
|
||
|
||
for (auto & i : *allowedPaths) {
|
||
if (isDirOrInDir(path, i)) {
|
||
resolvedPaths[path_] = path;
|
||
return path;
|
||
}
|
||
}
|
||
|
||
throw RestrictedPathError("access to canonical path '%1%' is forbidden in restricted mode", path);
|
||
}
|
||
|
||
|
||
void EvalState::checkURI(const std::string & uri)
|
||
{
|
||
if (!evalSettings.restrictEval) return;
|
||
|
||
/* 'uri' should be equal to a prefix, or in a subdirectory of a
|
||
prefix. Thus, the prefix https://github.co does not permit
|
||
access to https://github.com. Note: this allows 'http://' and
|
||
'https://' as prefixes for any http/https URI. */
|
||
for (auto & prefix : evalSettings.allowedUris.get())
|
||
if (uri == prefix ||
|
||
(uri.size() > prefix.size()
|
||
&& prefix.size() > 0
|
||
&& hasPrefix(uri, prefix)
|
||
&& (prefix[prefix.size() - 1] == '/' || uri[prefix.size()] == '/')))
|
||
return;
|
||
|
||
/* If the URI is a path, then check it against allowedPaths as
|
||
well. */
|
||
if (hasPrefix(uri, "/")) {
|
||
checkSourcePath(uri);
|
||
return;
|
||
}
|
||
|
||
if (hasPrefix(uri, "file://")) {
|
||
checkSourcePath(std::string(uri, 7));
|
||
return;
|
||
}
|
||
|
||
throw RestrictedPathError("access to URI '%s' is forbidden in restricted mode", uri);
|
||
}
|
||
|
||
|
||
Path EvalState::toRealPath(const Path & path, const PathSet & context)
|
||
{
|
||
// FIXME: check whether 'path' is in 'context'.
|
||
return
|
||
!context.empty() && store->isInStore(path)
|
||
? store->toRealPath(path)
|
||
: path;
|
||
}
|
||
|
||
|
||
Value * EvalState::addConstant(const std::string & name, Value & v)
|
||
{
|
||
Value * v2 = allocValue();
|
||
*v2 = v;
|
||
addConstant(name, v2);
|
||
return v2;
|
||
}
|
||
|
||
|
||
void EvalState::addConstant(const std::string & name, Value * v)
|
||
{
|
||
staticBaseEnv.vars.emplace_back(symbols.create(name), baseEnvDispl);
|
||
baseEnv.values[baseEnvDispl++] = v;
|
||
auto name2 = name.substr(0, 2) == "__" ? name.substr(2) : name;
|
||
baseEnv.values[0]->attrs->push_back(Attr(symbols.create(name2), v));
|
||
}
|
||
|
||
|
||
Value * EvalState::addPrimOp(const std::string & name,
|
||
size_t arity, PrimOpFun primOp)
|
||
{
|
||
return addPrimOp(PrimOp { .fun = primOp, .arity = arity, .name = symbols.create(name) });
|
||
}
|
||
|
||
|
||
Value * EvalState::addPrimOp(PrimOp && primOp)
|
||
{
|
||
/* Hack to make constants lazy: turn them into a application of
|
||
the primop to a dummy value. */
|
||
if (primOp.arity == 0) {
|
||
primOp.arity = 1;
|
||
auto vPrimOp = allocValue();
|
||
vPrimOp->mkPrimOp(new PrimOp(std::move(primOp)));
|
||
Value v;
|
||
v.mkApp(vPrimOp, vPrimOp);
|
||
return addConstant(primOp.name, v);
|
||
}
|
||
|
||
Symbol envName = primOp.name;
|
||
if (hasPrefix(primOp.name, "__"))
|
||
primOp.name = symbols.create(std::string(primOp.name, 2));
|
||
|
||
Value * v = allocValue();
|
||
v->mkPrimOp(new PrimOp(std::move(primOp)));
|
||
staticBaseEnv.vars.emplace_back(envName, baseEnvDispl);
|
||
baseEnv.values[baseEnvDispl++] = v;
|
||
baseEnv.values[0]->attrs->push_back(Attr(primOp.name, v));
|
||
return v;
|
||
}
|
||
|
||
|
||
Value & EvalState::getBuiltin(const std::string & name)
|
||
{
|
||
return *baseEnv.values[0]->attrs->find(symbols.create(name))->value;
|
||
}
|
||
|
||
|
||
std::optional<EvalState::Doc> EvalState::getDoc(Value & v)
|
||
{
|
||
if (v.isPrimOp()) {
|
||
auto v2 = &v;
|
||
if (v2->primOp->doc)
|
||
return Doc {
|
||
.pos = noPos,
|
||
.name = v2->primOp->name,
|
||
.arity = v2->primOp->arity,
|
||
.args = v2->primOp->args,
|
||
.doc = v2->primOp->doc,
|
||
};
|
||
}
|
||
return {};
|
||
}
|
||
|
||
|
||
/* 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 throwTypeErrorWithTrace(
|
||
const Pos & pos,
|
||
const char * s,
|
||
const std::string & s2,
|
||
const Symbol & sym,
|
||
const Pos & p2,
|
||
const char * s3))
|
||
{
|
||
throw EvalError({
|
||
.msg = hintfmt(s, s2, sym),
|
||
.errPos = pos,
|
||
}).addTrace(p2, s3);
|
||
}
|
||
|
||
LocalNoInlineNoReturn(void throwTypeErrorWithTrace(
|
||
const Pos & pos,
|
||
const Suggestions & suggestions,
|
||
const char * s,
|
||
const std::string & s2,
|
||
const Symbol & sym,
|
||
const Pos & p2,
|
||
const char * s3))
|
||
{
|
||
throw EvalError({
|
||
.msg = hintfmt(s, s2, sym),
|
||
.errPos = pos,
|
||
.suggestions = suggestions
|
||
}).addTrace(p2, s3);
|
||
}
|
||
|
||
LocalNoInlineNoReturn(void throwTypeErrorWithTrace(const char * s, const std::string & s2, const Pos & p2, const std::string_view s3))
|
||
{
|
||
throw TypeError(ErrorInfo {
|
||
.msg = hintfmt(s, s2),
|
||
}).addTrace(p2, s3);
|
||
}
|
||
|
||
LocalNoInlineNoReturn(void throwEvalErrorWithTrace(const char * s, const std::string & s2, const Pos & p2, const std::string_view s3))
|
||
{
|
||
throw EvalError(ErrorInfo {
|
||
.msg = hintfmt(s, s2),
|
||
}).addTrace(p2, s3);
|
||
}
|
||
|
||
LocalNoInlineNoReturn(void throwEvalErrorWithTrace(const char * s, const std::string_view & s2, const std::string_view & s3, const Pos & p2, const std::string_view s4))
|
||
{
|
||
throw EvalError(ErrorInfo {
|
||
.msg = hintfmt(s, s2, s3),
|
||
}).addTrace(p2, s4);
|
||
}
|
||
|
||
LocalNoInlineNoReturn(void throwEvalError(const Pos & pos, const Suggestions & suggestions, const char * s, const std::string & s2))
|
||
{
|
||
throw EvalError({
|
||
.msg = hintfmt(s, s2),
|
||
.errPos = pos,
|
||
.suggestions = suggestions,
|
||
});
|
||
}
|
||
|
||
LocalNoInlineNoReturn(void throwEvalError(const Pos & pos, const char * s, const Value & v))
|
||
{
|
||
throw AssertionError({
|
||
.msg = hintfmt(s, showType(v)),
|
||
.errPos = pos
|
||
});
|
||
}
|
||
|
||
LocalNoInlineNoReturn(void throwEvalError(const Pos & p1, const char * s, const Symbol & sym, const Pos & p2))
|
||
{
|
||
// p1 is where the error occurred; p2 is a position mentioned in the message.
|
||
throw EvalError({
|
||
.msg = hintfmt(s, sym, p2),
|
||
.errPos = p1
|
||
});
|
||
}
|
||
|
||
LocalNoInlineNoReturn(void throwEvalError(const char * s, const std::string_view & s1))
|
||
{
|
||
throw EvalError(s, s1);
|
||
}
|
||
|
||
LocalNoInlineNoReturn(void throwEvalError(const char * s, const std::string_view & s1, const std::string_view & s2))
|
||
{
|
||
throw EvalError(s, s1, s2);
|
||
}
|
||
|
||
LocalNoInlineNoReturn(void throwTypeError(const char * s, const Value & v))
|
||
{
|
||
throw TypeError(s, showType(v));
|
||
}
|
||
|
||
LocalNoInlineNoReturn(void throwAssertionError(const Pos & pos, const char * s, const std::string & s1))
|
||
{
|
||
throw AssertionError({
|
||
.msg = hintfmt(s, s1),
|
||
.errPos = pos
|
||
});
|
||
}
|
||
|
||
LocalNoInlineNoReturn(void throwUndefinedVarError(const Pos & pos, const char * s, const std::string & s1))
|
||
{
|
||
throw UndefinedVarError({
|
||
.msg = hintfmt(s, s1),
|
||
.errPos = pos
|
||
});
|
||
}
|
||
|
||
LocalNoInlineNoReturn(void throwMissingArgumentError(const Pos & pos, const char * s, const std::string & s1))
|
||
{
|
||
throw MissingArgumentError({
|
||
.msg = hintfmt(s, s1),
|
||
.errPos = pos
|
||
});
|
||
}
|
||
|
||
LocalNoInline(void addErrorTrace(Error & e, const char * s, const std::string & s2))
|
||
{
|
||
e.addTrace(std::nullopt, s, s2);
|
||
}
|
||
|
||
LocalNoInline(void addErrorTrace(Error & e, const Pos & pos, const char * s, const std::string & s2))
|
||
{
|
||
e.addTrace(pos, s, s2);
|
||
}
|
||
|
||
|
||
void Value::mkString(std::string_view s)
|
||
{
|
||
mkString(makeImmutableString(s));
|
||
}
|
||
|
||
|
||
static void copyContextToValue(Value & v, const PathSet & context)
|
||
{
|
||
if (!context.empty()) {
|
||
size_t 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;
|
||
}
|
||
}
|
||
|
||
void Value::mkString(std::string_view s, const PathSet & context)
|
||
{
|
||
mkString(s);
|
||
copyContextToValue(*this, context);
|
||
}
|
||
|
||
void Value::mkStringMove(const char * s, const PathSet & context)
|
||
{
|
||
mkString(s);
|
||
copyContextToValue(*this, context);
|
||
}
|
||
|
||
|
||
void Value::mkPath(std::string_view s)
|
||
{
|
||
mkPath(makeImmutableString(s));
|
||
}
|
||
|
||
|
||
inline Value * EvalState::lookupVar(Env * env, const ExprVar & var, bool noEval)
|
||
{
|
||
for (auto l = var.level; l; --l, env = env->up) ;
|
||
|
||
if (!var.fromWith) return env->values[var.displ];
|
||
|
||
while (1) {
|
||
if (env->type == Env::HasWithExpr) {
|
||
if (noEval) return 0;
|
||
Value * v = allocValue();
|
||
evalAttrs(*env->up, (Expr *) env->values[0], *v, noPos, "<borked>");
|
||
env->values[0] = v;
|
||
env->type = Env::HasWithAttrs;
|
||
}
|
||
Bindings::iterator j = env->values[0]->attrs->find(var.name);
|
||
if (j != env->values[0]->attrs->end()) {
|
||
if (countCalls) attrSelects[*j->pos]++;
|
||
return j->value;
|
||
}
|
||
if (!env->prevWith)
|
||
throwUndefinedVarError(var.pos, "undefined variable '%1%'", var.name);
|
||
for (size_t l = env->prevWith; l; --l, env = env->up) ;
|
||
}
|
||
}
|
||
|
||
|
||
void EvalState::mkList(Value & v, size_t size)
|
||
{
|
||
v.mkList(size);
|
||
if (size > 2)
|
||
v.bigList.elems = (Value * *) allocBytes(size * sizeof(Value *));
|
||
nrListElems += size;
|
||
}
|
||
|
||
|
||
unsigned long nrThunks = 0;
|
||
|
||
static inline void mkThunk(Value & v, Env & env, Expr * expr)
|
||
{
|
||
v.mkThunk(&env, expr);
|
||
nrThunks++;
|
||
}
|
||
|
||
|
||
void EvalState::mkThunk_(Value & v, Expr * expr)
|
||
{
|
||
mkThunk(v, baseEnv, expr);
|
||
}
|
||
|
||
|
||
void EvalState::mkPos(Value & v, ptr<Pos> pos)
|
||
{
|
||
if (pos->file.set()) {
|
||
auto attrs = buildBindings(3);
|
||
attrs.alloc(sFile).mkString(pos->file);
|
||
attrs.alloc(sLine).mkInt(pos->line);
|
||
attrs.alloc(sColumn).mkInt(pos->column);
|
||
v.mkAttrs(attrs);
|
||
} else
|
||
v.mkNull();
|
||
}
|
||
|
||
|
||
/* 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;
|
||
}
|
||
|
||
|
||
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) { state.nrAvoided++; return v; }
|
||
return Expr::maybeThunk(state, env);
|
||
}
|
||
|
||
|
||
Value * ExprString::maybeThunk(EvalState & state, Env & env)
|
||
{
|
||
state.nrAvoided++;
|
||
return &v;
|
||
}
|
||
|
||
Value * ExprInt::maybeThunk(EvalState & state, Env & env)
|
||
{
|
||
state.nrAvoided++;
|
||
return &v;
|
||
}
|
||
|
||
Value * ExprFloat::maybeThunk(EvalState & state, Env & env)
|
||
{
|
||
state.nrAvoided++;
|
||
return &v;
|
||
}
|
||
|
||
Value * ExprPath::maybeThunk(EvalState & state, Env & env)
|
||
{
|
||
state.nrAvoided++;
|
||
return &v;
|
||
}
|
||
|
||
|
||
void EvalState::evalFile(const Path & path_, Value & v, bool mustBeTrivial)
|
||
{
|
||
auto path = checkSourcePath(path_);
|
||
|
||
FileEvalCache::iterator i;
|
||
if ((i = fileEvalCache.find(path)) != fileEvalCache.end()) {
|
||
v = i->second;
|
||
return;
|
||
}
|
||
|
||
Path resolvedPath = resolveExprPath(path);
|
||
if ((i = fileEvalCache.find(resolvedPath)) != fileEvalCache.end()) {
|
||
v = i->second;
|
||
return;
|
||
}
|
||
|
||
printTalkative("evaluating file '%1%'", resolvedPath);
|
||
Expr * e = nullptr;
|
||
|
||
auto j = fileParseCache.find(resolvedPath);
|
||
if (j != fileParseCache.end())
|
||
e = j->second;
|
||
|
||
if (!e)
|
||
e = parseExprFromFile(checkSourcePath(resolvedPath));
|
||
|
||
cacheFile(path, resolvedPath, e, v, mustBeTrivial);
|
||
}
|
||
|
||
|
||
void EvalState::resetFileCache()
|
||
{
|
||
fileEvalCache.clear();
|
||
fileParseCache.clear();
|
||
}
|
||
|
||
|
||
void EvalState::cacheFile(
|
||
const Path & path,
|
||
const Path & resolvedPath,
|
||
Expr * e,
|
||
Value & v,
|
||
bool mustBeTrivial)
|
||
{
|
||
fileParseCache[resolvedPath] = e;
|
||
|
||
try {
|
||
// Enforce that 'flake.nix' is a direct attrset, not a computation.
|
||
if (mustBeTrivial && !(dynamic_cast<ExprAttrs *>(e)))
|
||
throwEvalError("file '%s' must be an attribute set", path);
|
||
eval(e, v);
|
||
} catch (Error & e) {
|
||
addErrorTrace(e, "while evaluating the file '%1%':", resolvedPath);
|
||
throw;
|
||
}
|
||
|
||
fileEvalCache[resolvedPath] = v;
|
||
if (path != resolvedPath) fileEvalCache[path] = v;
|
||
}
|
||
|
||
|
||
void EvalState::eval(Expr * e, Value & v)
|
||
{
|
||
e->eval(*this, baseEnv, v);
|
||
}
|
||
|
||
|
||
inline bool EvalState::evalBool(Env & env, Expr * e, const Pos & pos, const std::string_view & errorCtx)
|
||
{
|
||
try {
|
||
Value v;
|
||
e->eval(*this, env, v);
|
||
if (v.type() != nBool)
|
||
throwTypeError("value is %1% while a Boolean was expected", v);
|
||
return v.boolean;
|
||
} catch (Error & e) {
|
||
e.addTrace(pos, errorCtx);
|
||
throw;
|
||
}
|
||
}
|
||
|
||
|
||
inline void EvalState::evalAttrs(Env & env, Expr * e, Value & v, const Pos & pos, const std::string_view & errorCtx)
|
||
{
|
||
try {
|
||
e->eval(*this, env, v);
|
||
if (v.type() != nAttrs)
|
||
throwTypeError("value is %1% while a set was expected", v);
|
||
} catch (Error & e) {
|
||
e.addTrace(pos, errorCtx);
|
||
throw;
|
||
}
|
||
}
|
||
|
||
|
||
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)
|
||
{
|
||
v.mkAttrs(state.buildBindings(attrs.size() + dynamicAttrs.size()).finish());
|
||
auto 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. */
|
||
Displacement 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, ptr(&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, [&]() { return vOverrides->determinePos(noPos); }, "While evaluating the `__overrides` attribute");
|
||
Bindings * newBnds = state.allocBindings(v.attrs->capacity() + 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), ptr(&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() == nNull)
|
||
continue;
|
||
state.forceStringNoCtx(nameVal, i.pos, "While evaluating the name of a dynamic attribute");
|
||
Symbol nameSym = state.symbols.create(nameVal.string.s);
|
||
Bindings::iterator j = v.attrs->find(nameSym);
|
||
if (j != v.attrs->end())
|
||
throwEvalError(i.pos, "dynamic attribute '%1%' already defined at %2%", nameSym, *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), ptr(&i.pos)));
|
||
v.attrs->sort(); // FIXME: inefficient
|
||
}
|
||
|
||
v.attrs->pos = ptr(&pos);
|
||
}
|
||
|
||
|
||
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. */
|
||
Displacement 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 (auto [n, v2] : enumerate(v.listItems()))
|
||
const_cast<Value * &>(v2) = 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 std::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();
|
||
}
|
||
|
||
|
||
void ExprSelect::eval(EvalState & state, Env & env, Value & v)
|
||
{
|
||
Value vTmp;
|
||
ptr<Pos> pos2(&noPos);
|
||
Value * vAttrs = &vTmp;
|
||
|
||
e->eval(state, env, vTmp);
|
||
|
||
try {
|
||
|
||
for (auto & i : attrPath) {
|
||
state.nrLookups++;
|
||
Bindings::iterator j;
|
||
Symbol name = getName(i, state, env);
|
||
if (def) {
|
||
state.forceValue(*vAttrs, pos);
|
||
if (vAttrs->type() != nAttrs ||
|
||
(j = vAttrs->attrs->find(name)) == vAttrs->attrs->end())
|
||
{
|
||
def->eval(state, env, v);
|
||
return;
|
||
}
|
||
} else {
|
||
state.forceAttrs(*vAttrs, pos, "While selecting an attribute");
|
||
if ((j = vAttrs->attrs->find(name)) == vAttrs->attrs->end()) {
|
||
std::set<std::string> allAttrNames;
|
||
for (auto & attr : *vAttrs->attrs)
|
||
allAttrNames.insert(attr.name);
|
||
throwEvalError(
|
||
pos,
|
||
Suggestions::bestMatches(allAttrNames, name),
|
||
"attribute '%1%' missing", name);
|
||
}
|
||
}
|
||
vAttrs = j->value;
|
||
pos2 = j->pos;
|
||
if (state.countCalls) state.attrSelects[*pos2]++;
|
||
}
|
||
|
||
state.forceValue(*vAttrs, (*pos2 != noPos ? *pos2 : this->pos ) );
|
||
|
||
} catch (Error & e) {
|
||
if (*pos2 != noPos && pos2->file != state.sDerivationNix)
|
||
addErrorTrace(e, *pos2, "while evaluating the attribute '%1%'",
|
||
showAttrPath(state, env, attrPath));
|
||
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, noPos);
|
||
Bindings::iterator j;
|
||
Symbol name = getName(i, state, env);
|
||
if (vAttrs->type() != nAttrs ||
|
||
(j = vAttrs->attrs->find(name)) == vAttrs->attrs->end())
|
||
{
|
||
v.mkBool(false);
|
||
return;
|
||
} else {
|
||
vAttrs = j->value;
|
||
}
|
||
}
|
||
|
||
v.mkBool(true);
|
||
}
|
||
|
||
|
||
void ExprLambda::eval(EvalState & state, Env & env, Value & v)
|
||
{
|
||
v.mkLambda(&env, this);
|
||
}
|
||
|
||
const std::string prettyLambdaName(const ExprLambda & e)
|
||
{
|
||
return e.name.set() ? std::string(e.name): "anonymous lambda";
|
||
}
|
||
|
||
void EvalState::callFunction(Value & fun, size_t nrArgs, Value * * args, Value & vRes, const Pos & pos)
|
||
{
|
||
auto trace = evalSettings.traceFunctionCalls ? std::make_unique<FunctionCallTrace>(pos) : nullptr;
|
||
|
||
forceValue(fun, pos);
|
||
|
||
Value vCur(fun);
|
||
|
||
auto makeAppChain = [&]()
|
||
{
|
||
vRes = vCur;
|
||
for (size_t i = 0; i < nrArgs; ++i) {
|
||
auto fun2 = allocValue();
|
||
*fun2 = vRes;
|
||
vRes.mkPrimOpApp(fun2, args[i]);
|
||
}
|
||
};
|
||
|
||
Attr * functor;
|
||
|
||
while (nrArgs > 0) {
|
||
|
||
if (vCur.isLambda()) {
|
||
|
||
ExprLambda & lambda(*vCur.lambda.fun);
|
||
|
||
auto size =
|
||
(lambda.arg.empty() ? 0 : 1) +
|
||
(lambda.hasFormals() ? lambda.formals->formals.size() : 0);
|
||
Env & env2(allocEnv(size));
|
||
env2.up = vCur.lambda.env;
|
||
|
||
Displacement displ = 0;
|
||
|
||
if (!lambda.hasFormals())
|
||
env2.values[displ++] = args[0];
|
||
|
||
else {
|
||
try {
|
||
forceAttrs(*args[0], lambda.pos, "While evaluating the value passed for this lambda parameter");
|
||
} catch (Error & e) {
|
||
e.addTrace(pos, "from call site");
|
||
throw;
|
||
}
|
||
|
||
if (!lambda.arg.empty())
|
||
env2.values[displ++] = args[0];
|
||
|
||
/* 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. */
|
||
size_t attrsUsed = 0;
|
||
for (auto & i : lambda.formals->formals) {
|
||
auto j = args[0]->attrs->get(i.name);
|
||
if (!j) {
|
||
if (!i.def) {
|
||
throwTypeErrorWithTrace(lambda.pos,
|
||
"Function '%1%' called without required argument '%2%'", prettyLambdaName(lambda), i.name,
|
||
pos, "from call site");
|
||
}
|
||
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 != args[0]->attrs->size()) {
|
||
/* Nope, so show the first unexpected argument to the
|
||
user. */
|
||
for (auto & i : *args[0]->attrs)
|
||
if (!lambda.formals->has(i.name)) {
|
||
std::set<std::string> formalNames;
|
||
for (auto & formal : lambda.formals->formals)
|
||
formalNames.insert(formal.name);
|
||
throwTypeErrorWithTrace(lambda.pos,
|
||
Suggestions::bestMatches(formalNames, i.name),
|
||
"Function '%1%' called with unexpected argument '%2%'", prettyLambdaName(lambda), i.name,
|
||
pos, "from call site");
|
||
}
|
||
abort(); // can't happen
|
||
}
|
||
}
|
||
|
||
nrFunctionCalls++;
|
||
if (countCalls) incrFunctionCall(&lambda);
|
||
|
||
/* Evaluate the body. */
|
||
try {
|
||
lambda.body->eval(*this, env2, vCur);
|
||
} catch (Error & e) {
|
||
if (loggerSettings.showTrace.get()) {
|
||
addErrorTrace(e, lambda.pos, "While evaluating the '%s' function", prettyLambdaName(lambda));
|
||
if (pos) e.addTrace(pos, "from call site");
|
||
}
|
||
throw;
|
||
}
|
||
|
||
nrArgs--;
|
||
args += 1;
|
||
}
|
||
|
||
else if (vCur.isPrimOp()) {
|
||
|
||
size_t argsLeft = vCur.primOp->arity;
|
||
|
||
if (nrArgs < argsLeft) {
|
||
/* We don't have enough arguments, so create a tPrimOpApp chain. */
|
||
makeAppChain();
|
||
return;
|
||
} else {
|
||
/* We have all the arguments, so call the primop. */
|
||
Symbol name = vCur.primOp->name;
|
||
|
||
nrPrimOpCalls++;
|
||
if (countCalls) primOpCalls[name]++;
|
||
|
||
try {
|
||
vCur.primOp->fun(*this, pos, args, vCur);
|
||
} catch (Error & e) {
|
||
addErrorTrace(e, pos, "While calling the '%1%' builtin", name);
|
||
throw;
|
||
}
|
||
|
||
nrArgs -= argsLeft;
|
||
args += argsLeft;
|
||
}
|
||
}
|
||
|
||
else if (vCur.isPrimOpApp()) {
|
||
/* Figure out the number of arguments still needed. */
|
||
size_t argsDone = 0;
|
||
Value * primOp = &vCur;
|
||
while (primOp->isPrimOpApp()) {
|
||
argsDone++;
|
||
primOp = primOp->primOpApp.left;
|
||
}
|
||
assert(primOp->isPrimOp());
|
||
auto arity = primOp->primOp->arity;
|
||
auto argsLeft = arity - argsDone;
|
||
|
||
if (nrArgs < argsLeft) {
|
||
/* We still don't have enough arguments, so extend the tPrimOpApp chain. */
|
||
makeAppChain();
|
||
return;
|
||
} else {
|
||
/* We have all the arguments, so call the primop with
|
||
the previous and new arguments. */
|
||
|
||
Value * vArgs[arity];
|
||
auto n = argsDone;
|
||
for (Value * arg = &vCur; arg->isPrimOpApp(); arg = arg->primOpApp.left)
|
||
vArgs[--n] = arg->primOpApp.right;
|
||
|
||
for (size_t i = 0; i < argsLeft; ++i)
|
||
vArgs[argsDone + i] = args[i];
|
||
|
||
Symbol name = primOp->primOp->name;
|
||
nrPrimOpCalls++;
|
||
if (countCalls) primOpCalls[name]++;
|
||
|
||
try {
|
||
primOp->primOp->fun(*this, noPos, vArgs, vCur);
|
||
} catch (Error & e) {
|
||
addErrorTrace(e, pos, "While calling the '%1%' builtin", name);
|
||
throw;
|
||
}
|
||
|
||
nrArgs -= argsLeft;
|
||
args += argsLeft;
|
||
}
|
||
}
|
||
|
||
else if (vCur.type() == nAttrs && (functor = vCur.attrs->get(sFunctor))) {
|
||
/* 'vCur' 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. */
|
||
Value * args2[] = {allocValue(), args[0]};
|
||
*args2[0] = vCur;
|
||
try {
|
||
callFunction(*functor->value, 2, args2, vCur, *functor->pos);
|
||
} catch (Error & e) {
|
||
e.addTrace(pos, "While calling a functor (an attribute set with a 'functor' attribute)");
|
||
throw;
|
||
}
|
||
nrArgs--;
|
||
args++;
|
||
}
|
||
|
||
else
|
||
throwTypeError(pos, "attempt to call something which is not a function but %1%", vCur);
|
||
}
|
||
|
||
vRes = vCur;
|
||
}
|
||
|
||
|
||
void ExprCall::eval(EvalState & state, Env & env, Value & v)
|
||
{
|
||
Value vFun;
|
||
fun->eval(state, env, vFun);
|
||
|
||
Value * vArgs[args.size()];
|
||
for (size_t i = 0; i < args.size(); ++i)
|
||
vArgs[i] = args[i]->maybeThunk(state, env);
|
||
|
||
state.callFunction(vFun, args.size(), vArgs, v, pos);
|
||
}
|
||
|
||
|
||
// 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)
|
||
{
|
||
auto pos = fun.determinePos(noPos);
|
||
|
||
forceValue(fun, pos);
|
||
|
||
if (fun.type() == nAttrs) {
|
||
auto found = fun.attrs->find(sFunctor);
|
||
if (found != fun.attrs->end()) {
|
||
Value * v = allocValue();
|
||
callFunction(*found->value, fun, *v, pos);
|
||
forceValue(*v, pos);
|
||
return autoCallFunction(args, *v, res);
|
||
}
|
||
}
|
||
|
||
if (!fun.isLambda() || !fun.lambda.fun->hasFormals()) {
|
||
res = fun;
|
||
return;
|
||
}
|
||
|
||
auto attrs = buildBindings(std::max(static_cast<uint32_t>(fun.lambda.fun->formals->formals.size()), args.size()));
|
||
|
||
if (fun.lambda.fun->formals->ellipsis) {
|
||
// If the formals have an ellipsis (eg the function accepts extra args) pass
|
||
// all available automatic arguments (which includes arguments specified on
|
||
// the command line via --arg/--argstr)
|
||
for (auto & v : args)
|
||
attrs.insert(v);
|
||
} else {
|
||
// Otherwise, only pass the arguments that the function accepts
|
||
for (auto & i : fun.lambda.fun->formals->formals) {
|
||
Bindings::iterator j = args.find(i.name);
|
||
if (j != args.end()) {
|
||
attrs.insert(*j);
|
||
} else if (!i.def) {
|
||
throwMissingArgumentError(i.pos, R"(cannot evaluate a function that has an argument without a value ('%1%')
|
||
|
||
Nix attempted to evaluate a function as a top level expression; in
|
||
this case it must have its arguments supplied either by default
|
||
values, or passed explicitly with '--arg' or '--argstr'. See
|
||
https://nixos.org/manual/nix/stable/#ss-functions.)", i.name);
|
||
|
||
}
|
||
}
|
||
}
|
||
|
||
callFunction(fun, allocValue()->mkAttrs(attrs), res, noPos);
|
||
}
|
||
|
||
|
||
void ExprWith::eval(EvalState & state, Env & env, Value & v)
|
||
{
|
||
Env & env2(state.allocEnv(1));
|
||
env2.up = &env;
|
||
env2.prevWith = prevWith;
|
||
env2.type = Env::HasWithExpr;
|
||
env2.values[0] = (Value *) attrs;
|
||
|
||
body->eval(state, env2, v);
|
||
}
|
||
|
||
|
||
void ExprIf::eval(EvalState & state, Env & env, Value & v)
|
||
{
|
||
// We cheat in the parser, an pass the position of the condition as the position of the if itself.
|
||
(state.evalBool(env, cond, pos, "While evaluating a branch condition") ? then : else_)->eval(state, env, v);
|
||
}
|
||
|
||
|
||
void ExprAssert::eval(EvalState & state, Env & env, Value & v)
|
||
{
|
||
if (!state.evalBool(env, cond, pos, "In the condition of the assert statement")) {
|
||
std::ostringstream out;
|
||
cond->show(out);
|
||
throwAssertionError(pos, "assertion '%1%' failed", out.str());
|
||
}
|
||
body->eval(state, env, v);
|
||
}
|
||
|
||
|
||
void ExprOpNot::eval(EvalState & state, Env & env, Value & v)
|
||
{
|
||
v.mkBool(!state.evalBool(env, e, noPos, "In the argument of the not operator")); // XXX: FIXME: !
|
||
}
|
||
|
||
|
||
void ExprOpEq::eval(EvalState & state, Env & env, Value & v)
|
||
{
|
||
Value v1; e1->eval(state, env, v1);
|
||
Value v2; e2->eval(state, env, v2);
|
||
v.mkBool(state.eqValues(v1, v2, pos, "While testing two values for equality"));
|
||
}
|
||
|
||
|
||
void ExprOpNEq::eval(EvalState & state, Env & env, Value & v)
|
||
{
|
||
Value v1; e1->eval(state, env, v1);
|
||
Value v2; e2->eval(state, env, v2);
|
||
v.mkBool(!state.eqValues(v1, v2, pos, "While testing two values for inequality"));
|
||
}
|
||
|
||
|
||
void ExprOpAnd::eval(EvalState & state, Env & env, Value & v)
|
||
{
|
||
v.mkBool(state.evalBool(env, e1, pos, "In the left operand of the AND (&&) operator") && state.evalBool(env, e2, pos, "In the right operand of the AND (&&) operator"));
|
||
}
|
||
|
||
|
||
void ExprOpOr::eval(EvalState & state, Env & env, Value & v)
|
||
{
|
||
v.mkBool(state.evalBool(env, e1, pos, "In the left operand of the OR (||) operator") || state.evalBool(env, e2, pos, "In the right operand of the OR (||) operator"));
|
||
}
|
||
|
||
|
||
void ExprOpImpl::eval(EvalState & state, Env & env, Value & v)
|
||
{
|
||
v.mkBool(!state.evalBool(env, e1, pos, "In the left operand of the IMPL (->) operator") || state.evalBool(env, e2, pos, "In the right operand of the IMPL (->) operator"));
|
||
}
|
||
|
||
|
||
void ExprOpUpdate::eval(EvalState & state, Env & env, Value & v)
|
||
{
|
||
Value v1, v2;
|
||
state.evalAttrs(env, e1, v1, pos, "In the left operand of the update (//) operator");
|
||
state.evalAttrs(env, e2, v2, pos, "In the right operand of the update (//) operator");
|
||
|
||
state.nrOpUpdates++;
|
||
|
||
if (v1.attrs->size() == 0) { v = v2; return; }
|
||
if (v2.attrs->size() == 0) { v = v1; return; }
|
||
|
||
auto attrs = state.buildBindings(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) {
|
||
attrs.insert(*j);
|
||
++i; ++j;
|
||
}
|
||
else if (i->name < j->name)
|
||
attrs.insert(*i++);
|
||
else
|
||
attrs.insert(*j++);
|
||
}
|
||
|
||
while (i != v1.attrs->end()) attrs.insert(*i++);
|
||
while (j != v2.attrs->end()) attrs.insert(*j++);
|
||
|
||
v.mkAttrs(attrs.alreadySorted());
|
||
|
||
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, "While evaluating one of the elements to concatenate");
|
||
}
|
||
|
||
|
||
void EvalState::concatLists(Value & v, size_t nrLists, Value * * lists, const Pos & pos, const std::string_view & errorCtx)
|
||
{
|
||
nrListConcats++;
|
||
|
||
Value * nonEmpty = 0;
|
||
size_t len = 0;
|
||
for (size_t n = 0; n < nrLists; ++n) {
|
||
forceList(*lists[n], pos, errorCtx);
|
||
auto 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 (size_t n = 0, pos = 0; n < nrLists; ++n) {
|
||
auto l = lists[n]->listSize();
|
||
if (l)
|
||
memcpy(out + pos, lists[n]->listElems(), l * sizeof(Value *));
|
||
pos += l;
|
||
}
|
||
}
|
||
|
||
|
||
void ExprConcatStrings::eval(EvalState & state, Env & env, Value & v)
|
||
{
|
||
PathSet context;
|
||
std::vector<BackedStringView> s;
|
||
size_t sSize = 0;
|
||
NixInt n = 0;
|
||
NixFloat nf = 0;
|
||
|
||
bool first = !forceString;
|
||
ValueType firstType = nString;
|
||
|
||
const auto str = [&] {
|
||
std::string result;
|
||
result.reserve(sSize);
|
||
for (const auto & part : s) result += *part;
|
||
return result;
|
||
};
|
||
/* c_str() is not str().c_str() because we want to create a string
|
||
Value. allocating a GC'd string directly and moving it into a
|
||
Value lets us avoid an allocation and copy. */
|
||
const auto c_str = [&] {
|
||
char * result = allocString(sSize + 1);
|
||
char * tmp = result;
|
||
for (const auto & part : s) {
|
||
memcpy(tmp, part->data(), part->size());
|
||
tmp += part->size();
|
||
}
|
||
*tmp = 0;
|
||
return result;
|
||
};
|
||
|
||
Value values[es->size()];
|
||
Value * vTmpP = values;
|
||
|
||
for (auto & [i_pos, i] : *es) {
|
||
Value & vTmp = *vTmpP++;
|
||
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();
|
||
}
|
||
|
||
if (firstType == nInt) {
|
||
if (vTmp.type() == nInt) {
|
||
n += vTmp.integer;
|
||
} else if (vTmp.type() == nFloat) {
|
||
// Upgrade the type from int to float;
|
||
firstType = nFloat;
|
||
nf = n;
|
||
nf += vTmp.fpoint;
|
||
} else
|
||
throwEvalError(i_pos, "cannot add %1% to an integer", vTmp);
|
||
} else if (firstType == nFloat) {
|
||
if (vTmp.type() == nInt) {
|
||
nf += vTmp.integer;
|
||
} else if (vTmp.type() == nFloat) {
|
||
nf += vTmp.fpoint;
|
||
} else
|
||
throwEvalError(i_pos, "cannot add %1% to a float", vTmp);
|
||
} else {
|
||
if (s.empty()) s.reserve(es->size());
|
||
/* skip canonization of first path, which would only be not
|
||
canonized in the first place if it's coming from a ./${foo} type
|
||
path */
|
||
auto part = state.coerceToString(i_pos, vTmp, context, false, firstType == nString, !first, "While evaluating a path segment");
|
||
sSize += part->size();
|
||
s.emplace_back(std::move(part));
|
||
}
|
||
|
||
first = false;
|
||
}
|
||
|
||
if (firstType == nInt)
|
||
v.mkInt(n);
|
||
else if (firstType == nFloat)
|
||
v.mkFloat(nf);
|
||
else if (firstType == nPath) {
|
||
if (!context.empty())
|
||
throwEvalError(pos, "a string that refers to a store path cannot be appended to a path");
|
||
v.mkPath(canonPath(str()));
|
||
} else
|
||
v.mkStringMove(c_str(), context);
|
||
}
|
||
|
||
|
||
void ExprPos::eval(EvalState & state, Env & env, Value & v)
|
||
{
|
||
state.mkPos(v, ptr(&pos));
|
||
}
|
||
|
||
|
||
void EvalState::forceValueDeep(Value & v)
|
||
{
|
||
std::set<const Value *> seen;
|
||
|
||
std::function<void(Value & v)> recurse;
|
||
|
||
recurse = [&](Value & v) {
|
||
if (!seen.insert(&v).second) return;
|
||
|
||
forceValue(v, [&]() { return v.determinePos(noPos); });
|
||
|
||
if (v.type() == nAttrs) {
|
||
for (auto & i : *v.attrs)
|
||
try {
|
||
recurse(*i.value);
|
||
} catch (Error & e) {
|
||
addErrorTrace(e, *i.pos, "while evaluating the attribute '%1%'", i.name);
|
||
throw;
|
||
}
|
||
}
|
||
|
||
else if (v.isList()) {
|
||
for (auto v2 : v.listItems())
|
||
recurse(*v2);
|
||
}
|
||
};
|
||
|
||
recurse(v);
|
||
}
|
||
|
||
|
||
NixInt EvalState::forceInt(Value & v, const Pos & pos, const std::string_view & errorCtx)
|
||
{
|
||
try {
|
||
forceValue(v, pos);
|
||
if (v.type() != nInt)
|
||
throwTypeError("value is %1% while an integer was expected", v);
|
||
return v.integer;
|
||
} catch (Error & e) {
|
||
e.addTrace(pos, errorCtx);
|
||
throw;
|
||
}
|
||
}
|
||
|
||
|
||
NixFloat EvalState::forceFloat(Value & v, const Pos & pos, const std::string_view & errorCtx)
|
||
{
|
||
try {
|
||
forceValue(v, pos);
|
||
if (v.type() == nInt)
|
||
return v.integer;
|
||
else if (v.type() != nFloat)
|
||
throwTypeError("value is %1% while a float was expected", v);
|
||
return v.fpoint;
|
||
} catch (Error & e) {
|
||
e.addTrace(pos, errorCtx);
|
||
throw;
|
||
}
|
||
}
|
||
|
||
|
||
bool EvalState::forceBool(Value & v, const Pos & pos, const std::string_view & errorCtx)
|
||
{
|
||
try {
|
||
forceValue(v, pos);
|
||
if (v.type() != nBool)
|
||
throwTypeError("value is %1% while a Boolean was expected", v);
|
||
return v.boolean;
|
||
} catch (Error & e) {
|
||
e.addTrace(pos, errorCtx);
|
||
throw;
|
||
}
|
||
}
|
||
|
||
|
||
bool EvalState::isFunctor(Value & fun)
|
||
{
|
||
return fun.type() == nAttrs && fun.attrs->find(sFunctor) != fun.attrs->end();
|
||
}
|
||
|
||
|
||
void EvalState::forceFunction(Value & v, const Pos & pos, const std::string_view & errorCtx)
|
||
{
|
||
try {
|
||
forceValue(v, pos);
|
||
if (v.type() != nFunction && !isFunctor(v))
|
||
throwTypeError("value is %1% while a function was expected", v);
|
||
} catch (Error & e) {
|
||
e.addTrace(pos, errorCtx);
|
||
throw;
|
||
}
|
||
}
|
||
|
||
|
||
std::string_view EvalState::forceString(Value & v, const Pos & pos, const std::string_view & errorCtx)
|
||
{
|
||
try {
|
||
forceValue(v, pos);
|
||
if (v.type() != nString)
|
||
throwTypeError("value is %1% while a string was expected", v);
|
||
return v.string.s;
|
||
} catch (Error & e) {
|
||
e.addTrace(pos, errorCtx);
|
||
throw;
|
||
}
|
||
}
|
||
|
||
|
||
/* Decode a context string ‘!<name>!<path>’ into a pair <path,
|
||
name>. */
|
||
std::pair<std::string, std::string> decodeContext(std::string_view s)
|
||
{
|
||
if (s.at(0) == '!') {
|
||
size_t index = s.find("!", 1);
|
||
return {std::string(s.substr(index + 1)), std::string(s.substr(1, index - 1))};
|
||
} else
|
||
return {s.at(0) == '/' ? std::string(s) : std::string(s.substr(1)), ""};
|
||
}
|
||
|
||
|
||
void copyContext(const Value & v, PathSet & context)
|
||
{
|
||
if (v.string.context)
|
||
for (const char * * p = v.string.context; *p; ++p)
|
||
context.insert(*p);
|
||
}
|
||
|
||
|
||
std::vector<std::pair<Path, std::string>> Value::getContext()
|
||
{
|
||
std::vector<std::pair<Path, std::string>> res;
|
||
assert(internalType == tString);
|
||
if (string.context)
|
||
for (const char * * p = string.context; *p; ++p)
|
||
res.push_back(decodeContext(*p));
|
||
return res;
|
||
}
|
||
|
||
|
||
std::string_view EvalState::forceString(Value & v, PathSet & context, const Pos & pos, const std::string_view & errorCtx)
|
||
{
|
||
auto s = forceString(v, pos, errorCtx);
|
||
copyContext(v, context);
|
||
return s;
|
||
}
|
||
|
||
|
||
std::string_view EvalState::forceStringNoCtx(Value & v, const Pos & pos, const std::string_view & errorCtx)
|
||
{
|
||
try {
|
||
auto s = forceString(v, pos, errorCtx);
|
||
if (v.string.context) {
|
||
if (pos)
|
||
throwEvalError("the string '%1%' is not allowed to refer to a store path (such as '%2%')", v.string.s, v.string.context[0]);
|
||
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;
|
||
} catch (Error & e) {
|
||
e.addTrace(pos, errorCtx);
|
||
throw;
|
||
}
|
||
}
|
||
|
||
|
||
bool EvalState::isDerivation(Value & v)
|
||
{
|
||
if (v.type() != nAttrs) return false;
|
||
Bindings::iterator i = v.attrs->find(sType);
|
||
if (i == v.attrs->end()) return false;
|
||
forceValue(*i->value, *i->pos);
|
||
if (i->value->type() != nString) return false;
|
||
return strcmp(i->value->string.s, "derivation") == 0;
|
||
}
|
||
|
||
|
||
std::optional<std::string> EvalState::tryAttrsToString(const Pos & pos, Value & v,
|
||
PathSet & context, bool coerceMore, bool copyToStore)
|
||
{
|
||
auto i = v.attrs->find(sToString);
|
||
if (i != v.attrs->end()) {
|
||
Value v1;
|
||
callFunction(*i->value, v, v1, pos);
|
||
return coerceToString(pos, v1, context, coerceMore, copyToStore,
|
||
"While evaluating the result of the `toString` attribute").toOwned();
|
||
}
|
||
|
||
return {};
|
||
}
|
||
|
||
BackedStringView EvalState::coerceToString(const Pos & pos, Value & v, PathSet & context,
|
||
bool coerceMore, bool copyToStore, bool canonicalizePath, const std::string_view & errorCtx)
|
||
{
|
||
forceValue(v, pos);
|
||
|
||
if (v.type() == nString) {
|
||
copyContext(v, context);
|
||
return std::string_view(v.string.s);
|
||
}
|
||
|
||
if (v.type() == nPath) {
|
||
BackedStringView path(PathView(v.path));
|
||
if (canonicalizePath)
|
||
path = canonPath(*path);
|
||
if (copyToStore)
|
||
path = copyPathToStore(context, std::move(path).toOwned());
|
||
return path;
|
||
}
|
||
|
||
if (v.type() == nAttrs) {
|
||
auto maybeString = tryAttrsToString(pos, v, context, coerceMore, copyToStore);
|
||
if (maybeString)
|
||
return std::move(*maybeString);
|
||
auto i = v.attrs->find(sOutPath);
|
||
if (i == v.attrs->end())
|
||
throwTypeErrorWithTrace("cannot coerce %1% to a string", showType(v), pos, errorCtx);
|
||
return coerceToString(pos, *i->value, context, coerceMore, copyToStore, canonicalizePath, errorCtx);
|
||
}
|
||
|
||
if (v.type() == nExternal)
|
||
return v.external->coerceToString(pos, context, coerceMore, copyToStore, errorCtx);
|
||
|
||
if (coerceMore) {
|
||
|
||
/* Note that `false' is represented as an empty string for
|
||
shell scripting convenience, just like `null'. */
|
||
if (v.type() == nBool && v.boolean) return "1";
|
||
if (v.type() == nBool && !v.boolean) return "";
|
||
if (v.type() == nInt) return std::to_string(v.integer);
|
||
if (v.type() == nFloat) return std::to_string(v.fpoint);
|
||
if (v.type() == nNull) return "";
|
||
|
||
if (v.isList()) {
|
||
std::string result;
|
||
for (auto [n, v2] : enumerate(v.listItems())) {
|
||
try {
|
||
result += *coerceToString(noPos, *v2, context, coerceMore, copyToStore, canonicalizePath,
|
||
"While evaluating one element of the list");
|
||
} catch (Error & e) {
|
||
e.addTrace(pos, errorCtx);
|
||
throw;
|
||
}
|
||
if (n < v.listSize() - 1
|
||
/* !!! not quite correct */
|
||
&& (!v2->isList() || v2->listSize() != 0))
|
||
result += " ";
|
||
}
|
||
return std::move(result);
|
||
}
|
||
}
|
||
|
||
throwTypeErrorWithTrace("cannot coerce %1% to a string", showType(v), pos, errorCtx);
|
||
}
|
||
|
||
|
||
std::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;
|
||
auto i = srcToStore.find(path);
|
||
if (i != srcToStore.end())
|
||
dstPath = store->printStorePath(i->second);
|
||
else {
|
||
auto p = settings.readOnlyMode
|
||
? store->computeStorePathForPath(std::string(baseNameOf(path)), checkSourcePath(path)).first
|
||
: store->addToStore(std::string(baseNameOf(path)), checkSourcePath(path), FileIngestionMethod::Recursive, htSHA256, defaultPathFilter, repair);
|
||
dstPath = store->printStorePath(p);
|
||
allowPath(p);
|
||
srcToStore.insert_or_assign(path, std::move(p));
|
||
printMsg(lvlChatty, "copied source '%1%' -> '%2%'", path, dstPath);
|
||
}
|
||
|
||
context.insert(dstPath);
|
||
return dstPath;
|
||
}
|
||
|
||
|
||
Path EvalState::coerceToPath(const Pos & pos, Value & v, PathSet & context, const std::string_view & errorCtx)
|
||
{
|
||
auto path = coerceToString(pos, v, context, false, false, true, errorCtx).toOwned();
|
||
if (path == "" || path[0] != '/')
|
||
throwEvalErrorWithTrace("string '%1%' doesn't represent an absolute path", path, pos, errorCtx);
|
||
return path;
|
||
}
|
||
|
||
|
||
StorePath EvalState::coerceToStorePath(const Pos & pos, Value & v, PathSet & context, const std::string_view & errorCtx)
|
||
{
|
||
auto path = coerceToString(pos, v, context, false, false, true, errorCtx).toOwned();
|
||
if (auto storePath = store->maybeParseStorePath(path))
|
||
return *storePath;
|
||
throwEvalErrorWithTrace("path '%1%' is not in the Nix store", path, pos, errorCtx);
|
||
}
|
||
|
||
|
||
bool EvalState::eqValues(Value & v1, Value & v2, const Pos & pos, const std::string_view & errorCtx)
|
||
{
|
||
forceValue(v1, noPos);
|
||
forceValue(v2, noPos);
|
||
|
||
/* !!! 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() == nInt && v2.type() == nFloat)
|
||
return v1.integer == v2.fpoint;
|
||
if (v1.type() == nFloat && v2.type() == nInt)
|
||
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 nInt:
|
||
return v1.integer == v2.integer;
|
||
|
||
case nBool:
|
||
return v1.boolean == v2.boolean;
|
||
|
||
case nString:
|
||
return strcmp(v1.string.s, v2.string.s) == 0;
|
||
|
||
case nPath:
|
||
return strcmp(v1.path, v2.path) == 0;
|
||
|
||
case nNull:
|
||
return true;
|
||
|
||
case nList:
|
||
if (v1.listSize() != v2.listSize()) return false;
|
||
for (size_t n = 0; n < v1.listSize(); ++n)
|
||
if (!eqValues(*v1.listElems()[n], *v2.listElems()[n], pos, errorCtx)) return false;
|
||
return true;
|
||
|
||
case nAttrs: {
|
||
/* 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, pos, errorCtx);
|
||
}
|
||
|
||
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, pos, errorCtx))
|
||
return false;
|
||
|
||
return true;
|
||
}
|
||
|
||
/* Functions are incomparable. */
|
||
case nFunction:
|
||
return false;
|
||
|
||
case nExternal:
|
||
return *v1.external == *v2.external;
|
||
|
||
case nFloat:
|
||
return v1.fpoint == v2.fpoint;
|
||
|
||
default:
|
||
throwEvalErrorWithTrace("cannot compare %1% with %2%", showType(v1), showType(v2), pos, errorCtx);
|
||
}
|
||
}
|
||
|
||
void EvalState::printStats()
|
||
{
|
||
bool showStats = getEnv("NIX_SHOW_STATS").value_or("0") != "0";
|
||
|
||
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);
|
||
|
||
#if HAVE_BOEHMGC
|
||
GC_word heapSize, totalBytes;
|
||
GC_get_heap_usage_safe(&heapSize, 0, 0, 0, &totalBytes);
|
||
#endif
|
||
if (showStats) {
|
||
auto outPath = getEnv("NIX_SHOW_STATS_PATH").value_or("-");
|
||
std::fstream fs;
|
||
if (outPath != "-")
|
||
fs.open(outPath, std::fstream::out);
|
||
JSONObject topObj(outPath == "-" ? std::cerr : fs, true);
|
||
topObj.attr("cpuTime",cpuTime);
|
||
{
|
||
auto envs = topObj.object("envs");
|
||
envs.attr("number", nrEnvs);
|
||
envs.attr("elements", nrValuesInEnvs);
|
||
envs.attr("bytes", bEnvs);
|
||
}
|
||
{
|
||
auto lists = topObj.object("list");
|
||
lists.attr("elements", nrListElems);
|
||
lists.attr("bytes", bLists);
|
||
lists.attr("concats", nrListConcats);
|
||
}
|
||
{
|
||
auto values = topObj.object("values");
|
||
values.attr("number", nrValues);
|
||
values.attr("bytes", bValues);
|
||
}
|
||
{
|
||
auto syms = topObj.object("symbols");
|
||
syms.attr("number", symbols.size());
|
||
syms.attr("bytes", symbols.totalSize());
|
||
}
|
||
{
|
||
auto sets = topObj.object("sets");
|
||
sets.attr("number", nrAttrsets);
|
||
sets.attr("bytes", bAttrsets);
|
||
sets.attr("elements", nrAttrsInAttrsets);
|
||
}
|
||
{
|
||
auto sizes = topObj.object("sizes");
|
||
sizes.attr("Env", sizeof(Env));
|
||
sizes.attr("Value", sizeof(Value));
|
||
sizes.attr("Bindings", sizeof(Bindings));
|
||
sizes.attr("Attr", sizeof(Attr));
|
||
}
|
||
topObj.attr("nrOpUpdates", nrOpUpdates);
|
||
topObj.attr("nrOpUpdateValuesCopied", nrOpUpdateValuesCopied);
|
||
topObj.attr("nrThunks", nrThunks);
|
||
topObj.attr("nrAvoided", nrAvoided);
|
||
topObj.attr("nrLookups", nrLookups);
|
||
topObj.attr("nrPrimOpCalls", nrPrimOpCalls);
|
||
topObj.attr("nrFunctionCalls", nrFunctionCalls);
|
||
#if HAVE_BOEHMGC
|
||
{
|
||
auto gc = topObj.object("gc");
|
||
gc.attr("heapSize", heapSize);
|
||
gc.attr("totalBytes", totalBytes);
|
||
}
|
||
#endif
|
||
|
||
if (countCalls) {
|
||
{
|
||
auto obj = topObj.object("primops");
|
||
for (auto & i : primOpCalls)
|
||
obj.attr(i.first, i.second);
|
||
}
|
||
{
|
||
auto list = topObj.list("functions");
|
||
for (auto & i : functionCalls) {
|
||
auto obj = list.object();
|
||
if (i.first->name.set())
|
||
obj.attr("name", (const std::string &) i.first->name);
|
||
else
|
||
obj.attr("name", nullptr);
|
||
if (i.first->pos) {
|
||
obj.attr("file", (const std::string &) i.first->pos.file);
|
||
obj.attr("line", i.first->pos.line);
|
||
obj.attr("column", i.first->pos.column);
|
||
}
|
||
obj.attr("count", i.second);
|
||
}
|
||
}
|
||
{
|
||
auto list = topObj.list("attributes");
|
||
for (auto & i : attrSelects) {
|
||
auto obj = list.object();
|
||
if (i.first) {
|
||
obj.attr("file", (const std::string &) i.first.file);
|
||
obj.attr("line", i.first.line);
|
||
obj.attr("column", i.first.column);
|
||
}
|
||
obj.attr("count", i.second);
|
||
}
|
||
}
|
||
}
|
||
|
||
if (getEnv("NIX_SHOW_SYMBOLS").value_or("0") != "0") {
|
||
auto list = topObj.list("symbols");
|
||
symbols.dump([&](const std::string & s) { list.elem(s); });
|
||
}
|
||
}
|
||
}
|
||
|
||
|
||
std::string ExternalValueBase::coerceToString(const Pos & pos, PathSet & context, bool copyMore, bool copyToStore, const std::string_view & errorCtx) const
|
||
{
|
||
throwTypeErrorWithTrace("cannot coerce %1% to a string", showType(), pos, errorCtx);
|
||
}
|
||
|
||
|
||
bool ExternalValueBase::operator==(const ExternalValueBase & b) const
|
||
{
|
||
return false;
|
||
}
|
||
|
||
|
||
std::ostream & operator << (std::ostream & str, const ExternalValueBase & v) {
|
||
return v.print(str);
|
||
}
|
||
|
||
|
||
EvalSettings::EvalSettings()
|
||
{
|
||
auto var = getEnv("NIX_PATH");
|
||
if (var) nixPath = parseNixPath(*var);
|
||
}
|
||
|
||
Strings EvalSettings::getDefaultNixPath()
|
||
{
|
||
Strings res;
|
||
auto add = [&](const Path & p, const std::string & s = std::string()) {
|
||
if (pathExists(p)) {
|
||
if (s.empty()) {
|
||
res.push_back(p);
|
||
} else {
|
||
res.push_back(s + "=" + p);
|
||
}
|
||
}
|
||
};
|
||
|
||
if (!evalSettings.restrictEval && !evalSettings.pureEval) {
|
||
add(getHome() + "/.nix-defexpr/channels");
|
||
add(settings.nixStateDir + "/profiles/per-user/root/channels/nixpkgs", "nixpkgs");
|
||
add(settings.nixStateDir + "/profiles/per-user/root/channels");
|
||
}
|
||
|
||
return res;
|
||
}
|
||
|
||
EvalSettings evalSettings;
|
||
|
||
static GlobalConfig::Register rEvalSettings(&evalSettings);
|
||
|
||
|
||
}
|