forked from lix-project/lix
2124 lines
59 KiB
C++
2124 lines
59 KiB
C++
#include "eval.hh"
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#include "hash.hh"
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#include "util.hh"
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#include "store-api.hh"
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#include "derivations.hh"
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#include "globals.hh"
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#include "eval-inline.hh"
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#include "filetransfer.hh"
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#include "json.hh"
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#include "function-trace.hh"
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#include <algorithm>
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#include <chrono>
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#include <cstring>
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#include <unistd.h>
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#include <sys/time.h>
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#include <sys/resource.h>
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#include <iostream>
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#include <fstream>
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#include <sys/resource.h>
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#if HAVE_BOEHMGC
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#define GC_INCLUDE_NEW
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#include <gc/gc.h>
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#include <gc/gc_cpp.h>
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#include <boost/coroutine2/coroutine.hpp>
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#include <boost/coroutine2/protected_fixedsize_stack.hpp>
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#include <boost/context/stack_context.hpp>
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#endif
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namespace nix {
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static char * dupString(const char * s)
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{
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char * t;
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#if HAVE_BOEHMGC
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t = GC_STRDUP(s);
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#else
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t = strdup(s);
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#endif
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if (!t) throw std::bad_alloc();
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return t;
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}
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static char * dupStringWithLen(const char * s, size_t size)
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{
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char * t;
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#if HAVE_BOEHMGC
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t = GC_STRNDUP(s, size);
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#else
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t = strndup(s, size);
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#endif
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if (!t) throw std::bad_alloc();
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return t;
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}
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RootValue allocRootValue(Value * v)
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{
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#if HAVE_BOEHMGC
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return std::allocate_shared<Value *>(traceable_allocator<Value *>(), v);
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#else
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return std::make_shared<Value *>(v);
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#endif
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}
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void printValue(std::ostream & str, std::set<const Value *> & active, const Value & v)
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{
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checkInterrupt();
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if (!active.insert(&v).second) {
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str << "<CYCLE>";
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return;
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}
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switch (v.internalType) {
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case tInt:
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str << v.integer;
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break;
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case tBool:
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str << (v.boolean ? "true" : "false");
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break;
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case tString:
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str << "\"";
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for (const char * i = v.string.s; *i; i++)
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if (*i == '\"' || *i == '\\') str << "\\" << *i;
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else if (*i == '\n') str << "\\n";
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else if (*i == '\r') str << "\\r";
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else if (*i == '\t') str << "\\t";
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else if (*i == '$' && *(i+1) == '{') str << "\\" << *i;
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else str << *i;
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str << "\"";
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break;
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case tPath:
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str << v.path; // !!! escaping?
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break;
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case tNull:
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str << "null";
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break;
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case tAttrs: {
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str << "{ ";
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for (auto & i : v.attrs->lexicographicOrder()) {
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str << i->name << " = ";
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printValue(str, active, *i->value);
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str << "; ";
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}
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str << "}";
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break;
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}
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case tList1:
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case tList2:
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case tListN:
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str << "[ ";
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for (unsigned int n = 0; n < v.listSize(); ++n) {
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printValue(str, active, *v.listElems()[n]);
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str << " ";
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}
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str << "]";
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break;
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case tThunk:
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case tApp:
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str << "<CODE>";
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break;
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case tLambda:
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str << "<LAMBDA>";
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break;
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case tPrimOp:
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str << "<PRIMOP>";
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break;
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case tPrimOpApp:
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str << "<PRIMOP-APP>";
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break;
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case tExternal:
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str << *v.external;
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break;
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case tFloat:
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str << v.fpoint;
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break;
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default:
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throw Error("invalid value");
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}
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active.erase(&v);
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}
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std::ostream & operator << (std::ostream & str, const Value & v)
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{
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std::set<const Value *> active;
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printValue(str, active, v);
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return str;
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}
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const Value *getPrimOp(const Value &v) {
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const Value * primOp = &v;
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while (primOp->isPrimOpApp()) {
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primOp = primOp->primOpApp.left;
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}
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assert(primOp->isPrimOp());
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return primOp;
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}
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string showType(ValueType type)
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{
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switch (type) {
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case nInt: return "an integer";
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case nBool: return "a Boolean";
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case nString: return "a string";
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case nPath: return "a path";
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case nNull: return "null";
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case nAttrs: return "a set";
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case nList: return "a list";
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case nFunction: return "a function";
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case nExternal: return "an external value";
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case nFloat: return "a float";
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case nThunk: return "a thunk";
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}
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abort();
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}
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string showType(const Value & v)
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{
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switch (v.internalType) {
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case tString: return v.string.context ? "a string with context" : "a string";
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case tPrimOp:
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return fmt("the built-in function '%s'", string(v.primOp->name));
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case tPrimOpApp:
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return fmt("the partially applied built-in function '%s'", string(getPrimOp(v)->primOp->name));
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case tExternal: return v.external->showType();
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case tThunk: return "a thunk";
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case tApp: return "a function application";
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case tBlackhole: return "a black hole";
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default:
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return showType(v.type());
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}
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}
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Pos Value::determinePos(const Pos &pos) const
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{
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switch (internalType) {
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case tAttrs: return *attrs->pos;
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case tLambda: return lambda.fun->pos;
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case tApp: return app.left->determinePos(pos);
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default: return pos;
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}
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}
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bool Value::isTrivial() const
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{
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return
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internalType != tApp
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&& internalType != tPrimOpApp
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&& (internalType != tThunk
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|| (dynamic_cast<ExprAttrs *>(thunk.expr)
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&& ((ExprAttrs *) thunk.expr)->dynamicAttrs.empty())
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|| dynamic_cast<ExprLambda *>(thunk.expr)
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|| dynamic_cast<ExprList *>(thunk.expr));
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}
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#if HAVE_BOEHMGC
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/* Called when the Boehm GC runs out of memory. */
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static void * oomHandler(size_t requested)
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{
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/* Convert this to a proper C++ exception. */
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throw std::bad_alloc();
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}
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class BoehmGCStackAllocator : public StackAllocator {
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boost::coroutines2::protected_fixedsize_stack stack {
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// We allocate 8 MB, the default max stack size on NixOS.
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// A smaller stack might be quicker to allocate but reduces the stack
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// depth available for source filter expressions etc.
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std::max(boost::context::stack_traits::default_size(), static_cast<std::size_t>(8 * 1024 * 1024))
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};
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// This is specific to boost::coroutines2::protected_fixedsize_stack.
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// The stack protection page is included in sctx.size, so we have to
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// subtract one page size from the stack size.
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std::size_t pfss_usable_stack_size(boost::context::stack_context &sctx) {
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return sctx.size - boost::context::stack_traits::page_size();
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}
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public:
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boost::context::stack_context allocate() override {
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auto sctx = stack.allocate();
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// Stacks generally start at a high address and grow to lower addresses.
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// Architectures that do the opposite are rare; in fact so rare that
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// boost_routine does not implement it.
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// So we subtract the stack size.
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GC_add_roots(static_cast<char *>(sctx.sp) - pfss_usable_stack_size(sctx), sctx.sp);
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return sctx;
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}
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void deallocate(boost::context::stack_context sctx) override {
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GC_remove_roots(static_cast<char *>(sctx.sp) - pfss_usable_stack_size(sctx), sctx.sp);
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stack.deallocate(sctx);
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}
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};
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static BoehmGCStackAllocator boehmGCStackAllocator;
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#endif
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static Symbol getName(const AttrName & name, EvalState & state, Env & env)
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{
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if (name.symbol.set()) {
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return name.symbol;
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} else {
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Value nameValue;
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name.expr->eval(state, env, nameValue);
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state.forceStringNoCtx(nameValue);
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return state.symbols.create(nameValue.string.s);
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}
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}
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static bool gcInitialised = false;
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void initGC()
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{
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if (gcInitialised) return;
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#if HAVE_BOEHMGC
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/* Initialise the Boehm garbage collector. */
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/* Don't look for interior pointers. This reduces the odds of
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misdetection a bit. */
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GC_set_all_interior_pointers(0);
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/* We don't have any roots in data segments, so don't scan from
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there. */
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GC_set_no_dls(1);
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GC_INIT();
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GC_set_oom_fn(oomHandler);
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StackAllocator::defaultAllocator = &boehmGCStackAllocator;
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/* Set the initial heap size to something fairly big (25% of
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physical RAM, up to a maximum of 384 MiB) so that in most cases
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we don't need to garbage collect at all. (Collection has a
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fairly significant overhead.) The heap size can be overridden
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through libgc's GC_INITIAL_HEAP_SIZE environment variable. We
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should probably also provide a nix.conf setting for this. Note
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that GC_expand_hp() causes a lot of virtual, but not physical
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(resident) memory to be allocated. This might be a problem on
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systems that don't overcommit. */
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if (!getEnv("GC_INITIAL_HEAP_SIZE")) {
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size_t size = 32 * 1024 * 1024;
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#if HAVE_SYSCONF && defined(_SC_PAGESIZE) && defined(_SC_PHYS_PAGES)
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size_t maxSize = 384 * 1024 * 1024;
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long pageSize = sysconf(_SC_PAGESIZE);
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long pages = sysconf(_SC_PHYS_PAGES);
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if (pageSize != -1)
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size = (pageSize * pages) / 4; // 25% of RAM
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if (size > maxSize) size = maxSize;
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#endif
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debug(format("setting initial heap size to %1% bytes") % size);
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GC_expand_hp(size);
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}
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#endif
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gcInitialised = true;
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}
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/* Very hacky way to parse $NIX_PATH, which is colon-separated, but
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can contain URLs (e.g. "nixpkgs=https://bla...:foo=https://"). */
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static Strings parseNixPath(const string & s)
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{
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Strings res;
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auto p = s.begin();
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while (p != s.end()) {
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auto start = p;
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auto start2 = p;
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while (p != s.end() && *p != ':') {
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if (*p == '=') start2 = p + 1;
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++p;
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}
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if (p == s.end()) {
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if (p != start) res.push_back(std::string(start, p));
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break;
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}
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if (*p == ':') {
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if (isUri(std::string(start2, s.end()))) {
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++p;
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while (p != s.end() && *p != ':') ++p;
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}
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res.push_back(std::string(start, p));
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if (p == s.end()) break;
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}
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++p;
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}
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return res;
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}
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EvalState::EvalState(const Strings & _searchPath, ref<Store> store)
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: sWith(symbols.create("<with>"))
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, sOutPath(symbols.create("outPath"))
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, sDrvPath(symbols.create("drvPath"))
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, sType(symbols.create("type"))
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, sMeta(symbols.create("meta"))
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, sName(symbols.create("name"))
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, sValue(symbols.create("value"))
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, sSystem(symbols.create("system"))
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, sOverrides(symbols.create("__overrides"))
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, sOutputs(symbols.create("outputs"))
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, sOutputName(symbols.create("outputName"))
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, sIgnoreNulls(symbols.create("__ignoreNulls"))
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, sFile(symbols.create("file"))
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, sLine(symbols.create("line"))
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, sColumn(symbols.create("column"))
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, sFunctor(symbols.create("__functor"))
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, sToString(symbols.create("__toString"))
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, sRight(symbols.create("right"))
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, sWrong(symbols.create("wrong"))
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, sStructuredAttrs(symbols.create("__structuredAttrs"))
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, sBuilder(symbols.create("builder"))
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, sArgs(symbols.create("args"))
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, sContentAddressed(symbols.create("__contentAddressed"))
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, sOutputHash(symbols.create("outputHash"))
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, sOutputHashAlgo(symbols.create("outputHashAlgo"))
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, sOutputHashMode(symbols.create("outputHashMode"))
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, sRecurseForDerivations(symbols.create("recurseForDerivations"))
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, sDescription(symbols.create("description"))
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, sSelf(symbols.create("self"))
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, sEpsilon(symbols.create(""))
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, repair(NoRepair)
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, store(store)
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, regexCache(makeRegexCache())
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, baseEnv(allocEnv(128))
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, staticBaseEnv(false, 0)
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{
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countCalls = getEnv("NIX_COUNT_CALLS").value_or("0") != "0";
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assert(gcInitialised);
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static_assert(sizeof(Env) <= 16, "environment must be <= 16 bytes");
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/* Initialise the Nix expression search path. */
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if (!evalSettings.pureEval) {
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for (auto & i : _searchPath) addToSearchPath(i);
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for (auto & i : evalSettings.nixPath.get()) addToSearchPath(i);
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}
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if (evalSettings.restrictEval || evalSettings.pureEval) {
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allowedPaths = PathSet();
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for (auto & i : searchPath) {
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auto r = resolveSearchPathElem(i);
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if (!r.first) continue;
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auto path = r.second;
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if (store->isInStore(r.second)) {
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try {
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StorePathSet closure;
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store->computeFSClosure(store->toStorePath(r.second).first, closure);
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for (auto & path : closure)
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allowedPaths->insert(store->printStorePath(path));
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} catch (InvalidPath &) {
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allowedPaths->insert(r.second);
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}
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} else
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allowedPaths->insert(r.second);
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}
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}
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vEmptySet.mkAttrs(allocBindings(0));
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createBaseEnv();
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}
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EvalState::~EvalState()
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{
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}
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Path EvalState::checkSourcePath(const Path & path_)
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{
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if (!allowedPaths) return path_;
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auto i = resolvedPaths.find(path_);
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if (i != resolvedPaths.end())
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return i->second;
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bool found = false;
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|
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/* First canonicalize the path without symlinks, so we make sure an
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* attacker can't append ../../... to a path that would be in allowedPaths
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* and thus leak symlink targets.
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*/
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Path abspath = canonPath(path_);
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if (hasPrefix(abspath, corepkgsPrefix)) return abspath;
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for (auto & i : *allowedPaths) {
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if (isDirOrInDir(abspath, i)) {
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found = true;
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break;
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}
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}
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|
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if (!found)
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throw RestrictedPathError("access to path '%1%' is forbidden in restricted mode", abspath);
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|
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/* Resolve symlinks. */
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debug(format("checking access to '%s'") % abspath);
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Path path = canonPath(abspath, true);
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for (auto & i : *allowedPaths) {
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if (isDirOrInDir(path, i)) {
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resolvedPaths[path_] = path;
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return path;
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}
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}
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throw RestrictedPathError("access to path '%1%' is forbidden in restricted mode", path);
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}
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void EvalState::checkURI(const std::string & uri)
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{
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if (!evalSettings.restrictEval) return;
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|
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/* 'uri' should be equal to a prefix, or in a subdirectory of a
|
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prefix. Thus, the prefix https://github.co does not permit
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access to https://github.com. Note: this allows 'http://' and
|
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'https://' as prefixes for any http/https URI. */
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for (auto & prefix : evalSettings.allowedUris.get())
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if (uri == prefix ||
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(uri.size() > prefix.size()
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&& prefix.size() > 0
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&& hasPrefix(uri, prefix)
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&& (prefix[prefix.size() - 1] == '/' || uri[prefix.size()] == '/')))
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return;
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||
|
||
/* If the URI is a path, then check it against allowedPaths as
|
||
well. */
|
||
if (hasPrefix(uri, "/")) {
|
||
checkSourcePath(uri);
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return;
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||
}
|
||
|
||
if (hasPrefix(uri, "file://")) {
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checkSourcePath(std::string(uri, 7));
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return;
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}
|
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|
||
throw RestrictedPathError("access to URI '%s' is forbidden in restricted mode", uri);
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}
|
||
|
||
|
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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 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));
|
||
return v2;
|
||
}
|
||
|
||
|
||
Value * EvalState::addPrimOp(const string & name,
|
||
size_t arity, PrimOpFun primOp)
|
||
{
|
||
auto name2 = string(name, 0, 2) == "__" ? string(name, 2) : name;
|
||
Symbol sym = symbols.create(name2);
|
||
|
||
/* Hack to make constants lazy: turn them into a application of
|
||
the primop to a dummy value. */
|
||
if (arity == 0) {
|
||
auto vPrimOp = allocValue();
|
||
vPrimOp->mkPrimOp(new PrimOp { .fun = primOp, .arity = 1, .name = sym });
|
||
Value v;
|
||
mkApp(v, *vPrimOp, *vPrimOp);
|
||
return addConstant(name, v);
|
||
}
|
||
|
||
Value * v = allocValue();
|
||
v->mkPrimOp(new PrimOp { .fun = primOp, .arity = arity, .name = sym });
|
||
staticBaseEnv.vars[symbols.create(name)] = baseEnvDispl;
|
||
baseEnv.values[baseEnvDispl++] = v;
|
||
baseEnv.values[0]->attrs->push_back(Attr(sym, v));
|
||
return v;
|
||
}
|
||
|
||
|
||
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;
|
||
mkApp(v, *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[envName] = baseEnvDispl;
|
||
baseEnv.values[baseEnvDispl++] = v;
|
||
baseEnv.values[0]->attrs->push_back(Attr(primOp.name, v));
|
||
return v;
|
||
}
|
||
|
||
|
||
Value & EvalState::getBuiltin(const 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 throwEvalError(const char * s, const string & s2))
|
||
{
|
||
throw EvalError(s, s2);
|
||
}
|
||
|
||
LocalNoInlineNoReturn(void throwEvalError(const Pos & pos, const char * s, const string & s2))
|
||
{
|
||
throw EvalError({
|
||
.msg = hintfmt(s, s2),
|
||
.errPos = pos
|
||
});
|
||
}
|
||
|
||
LocalNoInlineNoReturn(void throwEvalError(const char * s, const string & s2, const string & s3))
|
||
{
|
||
throw EvalError(s, s2, s3);
|
||
}
|
||
|
||
LocalNoInlineNoReturn(void throwEvalError(const Pos & pos, const char * s, const string & s2, const string & s3))
|
||
{
|
||
throw EvalError({
|
||
.msg = hintfmt(s, s2, s3),
|
||
.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 throwTypeError(const Pos & pos, const char * s))
|
||
{
|
||
throw TypeError({
|
||
.msg = hintfmt(s),
|
||
.errPos = pos
|
||
});
|
||
}
|
||
|
||
LocalNoInlineNoReturn(void throwTypeError(const Pos & pos, const char * s, const ExprLambda & fun, const Symbol & s2))
|
||
{
|
||
throw TypeError({
|
||
.msg = hintfmt(s, fun.showNamePos(), s2),
|
||
.errPos = pos
|
||
});
|
||
}
|
||
|
||
LocalNoInlineNoReturn(void throwAssertionError(const Pos & pos, const char * s, const string & s1))
|
||
{
|
||
throw AssertionError({
|
||
.msg = hintfmt(s, s1),
|
||
.errPos = pos
|
||
});
|
||
}
|
||
|
||
LocalNoInlineNoReturn(void throwUndefinedVarError(const Pos & pos, const char * s, const string & s1))
|
||
{
|
||
throw UndefinedVarError({
|
||
.msg = hintfmt(s, s1),
|
||
.errPos = pos
|
||
});
|
||
}
|
||
|
||
LocalNoInlineNoReturn(void throwMissingArgumentError(const Pos & pos, const char * s, const string & s1))
|
||
{
|
||
throw MissingArgumentError({
|
||
.msg = hintfmt(s, s1),
|
||
.errPos = pos
|
||
});
|
||
}
|
||
|
||
LocalNoInline(void addErrorTrace(Error & e, const char * s, const string & s2))
|
||
{
|
||
e.addTrace(std::nullopt, s, s2);
|
||
}
|
||
|
||
LocalNoInline(void addErrorTrace(Error & e, const Pos & pos, const char * s, const string & s2))
|
||
{
|
||
e.addTrace(pos, s, s2);
|
||
}
|
||
|
||
|
||
void mkString(Value & v, const char * s)
|
||
{
|
||
v.mkString(dupString(s));
|
||
}
|
||
|
||
|
||
Value & mkString(Value & v, std::string_view s, const PathSet & context)
|
||
{
|
||
v.mkString(dupStringWithLen(s.data(), s.size()));
|
||
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;
|
||
}
|
||
return v;
|
||
}
|
||
|
||
|
||
void mkPath(Value & v, const char * s)
|
||
{
|
||
v.mkPath(dupString(s));
|
||
}
|
||
|
||
|
||
inline Value * EvalState::lookupVar(Env * env, const ExprVar & var, bool noEval)
|
||
{
|
||
for (size_t 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);
|
||
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 && j->pos) 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) ;
|
||
}
|
||
}
|
||
|
||
|
||
Value * EvalState::allocValue()
|
||
{
|
||
nrValues++;
|
||
auto v = (Value *) allocBytes(sizeof(Value));
|
||
return v;
|
||
}
|
||
|
||
|
||
Env & EvalState::allocEnv(size_t size)
|
||
{
|
||
nrEnvs++;
|
||
nrValuesInEnvs += size;
|
||
Env * env = (Env *) allocBytes(sizeof(Env) + size * sizeof(Value *));
|
||
env->type = Env::Plain;
|
||
|
||
/* We assume that env->values has been cleared by the allocator; maybeThunk() and lookupVar fromWith expect this. */
|
||
|
||
return *env;
|
||
}
|
||
|
||
|
||
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, Pos * pos)
|
||
{
|
||
if (pos && pos->file.set()) {
|
||
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;
|
||
}
|
||
|
||
|
||
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 path2 = resolveExprPath(path);
|
||
if ((i = fileEvalCache.find(path2)) != fileEvalCache.end()) {
|
||
v = i->second;
|
||
return;
|
||
}
|
||
|
||
printTalkative("evaluating file '%1%'", path2);
|
||
Expr * e = nullptr;
|
||
|
||
auto j = fileParseCache.find(path2);
|
||
if (j != fileParseCache.end())
|
||
e = j->second;
|
||
|
||
if (!e)
|
||
e = parseExprFromFile(checkSourcePath(path2));
|
||
|
||
fileParseCache[path2] = e;
|
||
|
||
try {
|
||
// Enforce that 'flake.nix' is a direct attrset, not a
|
||
// computation.
|
||
if (mustBeTrivial &&
|
||
!(dynamic_cast<ExprAttrs *>(e)))
|
||
throw EvalError("file '%s' must be an attribute set", path);
|
||
eval(e, v);
|
||
} catch (Error & e) {
|
||
addErrorTrace(e, "while evaluating the file '%1%':", path2);
|
||
throw;
|
||
}
|
||
|
||
fileEvalCache[path2] = v;
|
||
if (path != path2) fileEvalCache[path] = v;
|
||
}
|
||
|
||
|
||
void EvalState::resetFileCache()
|
||
{
|
||
fileEvalCache.clear();
|
||
fileParseCache.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() != nBool)
|
||
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() != nBool)
|
||
throwTypeError(pos, "value is %1% while a Boolean was expected", v);
|
||
return v.boolean;
|
||
}
|
||
|
||
|
||
inline void EvalState::evalAttrs(Env & env, Expr * e, Value & v)
|
||
{
|
||
e->eval(*this, env, v);
|
||
if (v.type() != nAttrs)
|
||
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. */
|
||
size_t 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->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), &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);
|
||
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), &i.pos));
|
||
v.attrs->sort(); // FIXME: inefficient
|
||
}
|
||
|
||
v.attrs->pos = &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. */
|
||
size_t 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 (size_t 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();
|
||
}
|
||
|
||
|
||
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) {
|
||
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);
|
||
if ((j = vAttrs->attrs->find(name)) == vAttrs->attrs->end())
|
||
throwEvalError(pos, "attribute '%1%' missing", name);
|
||
}
|
||
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)
|
||
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);
|
||
Bindings::iterator j;
|
||
Symbol name = getName(i, state, env);
|
||
if (vAttrs->type() != nAttrs ||
|
||
(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.mkLambda(&env, 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. */
|
||
size_t argsDone = 0;
|
||
Value * primOp = &fun;
|
||
while (primOp->isPrimOpApp()) {
|
||
argsDone++;
|
||
primOp = primOp->primOpApp.left;
|
||
}
|
||
assert(primOp->isPrimOp());
|
||
auto arity = primOp->primOp->arity;
|
||
auto 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];
|
||
auto n = arity - 1;
|
||
vArgs[n--] = &arg;
|
||
for (Value * arg = &fun; arg->isPrimOpApp(); 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.mkPrimOpApp(fun2, &arg);
|
||
}
|
||
}
|
||
|
||
void EvalState::callFunction(Value & fun, Value & arg, Value & v, const Pos & pos)
|
||
{
|
||
auto trace = evalSettings.traceFunctionCalls ? std::make_unique<FunctionCallTrace>(pos) : nullptr;
|
||
|
||
forceValue(fun, pos);
|
||
|
||
if (fun.isPrimOp() || fun.isPrimOpApp()) {
|
||
callPrimOp(fun, arg, v, pos);
|
||
return;
|
||
}
|
||
|
||
if (fun.type() == nAttrs) {
|
||
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? */
|
||
Value v2;
|
||
callFunction(*found->value, fun2, v2, pos);
|
||
return callFunction(v2, arg, v, pos);
|
||
}
|
||
}
|
||
|
||
if (!fun.isLambda())
|
||
throwTypeError(pos, "attempt to call something which is not a function but %1%", fun);
|
||
|
||
ExprLambda & lambda(*fun.lambda.fun);
|
||
|
||
auto size =
|
||
(lambda.arg.empty() ? 0 : 1) +
|
||
(lambda.matchAttrs ? lambda.formals->formals.size() : 0);
|
||
Env & env2(allocEnv(size));
|
||
env2.up = fun.lambda.env;
|
||
|
||
size_t 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. */
|
||
size_t 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(pos, "%1% called without required argument '%2%'",
|
||
lambda, i.name);
|
||
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(pos, "%1% called with unexpected argument '%2%'", lambda, i.name);
|
||
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 (loggerSettings.showTrace.get())
|
||
try {
|
||
lambda.body->eval(*this, env2, v);
|
||
} catch (Error & e) {
|
||
addErrorTrace(e, lambda.pos, "while evaluating %s",
|
||
(lambda.name.set()
|
||
? "'" + (string) lambda.name + "'"
|
||
: "anonymous lambda"));
|
||
addErrorTrace(e, pos, "from call site%s", "");
|
||
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() == nAttrs) {
|
||
auto found = fun.attrs->find(sFunctor);
|
||
if (found != fun.attrs->end()) {
|
||
Value * v = allocValue();
|
||
callFunction(*found->value, fun, *v, noPos);
|
||
forceValue(*v);
|
||
return autoCallFunction(args, *v, res);
|
||
}
|
||
}
|
||
|
||
if (!fun.isLambda() || !fun.lambda.fun->matchAttrs) {
|
||
res = fun;
|
||
return;
|
||
}
|
||
|
||
Value * actualArgs = allocValue();
|
||
mkAttrs(*actualArgs, 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) {
|
||
actualArgs->attrs->push_back(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()) {
|
||
actualArgs->attrs->push_back(*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);
|
||
|
||
}
|
||
}
|
||
}
|
||
|
||
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.type = Env::HasWithExpr;
|
||
env2.values[0] = (Value *) attrs;
|
||
|
||
body->eval(state, env2, v);
|
||
}
|
||
|
||
|
||
void ExprIf::eval(EvalState & state, Env & env, Value & v)
|
||
{
|
||
(state.evalBool(env, cond, pos) ? then : else_)->eval(state, env, v);
|
||
}
|
||
|
||
|
||
void ExprAssert::eval(EvalState & state, Env & env, Value & v)
|
||
{
|
||
if (!state.evalBool(env, cond, pos)) {
|
||
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)
|
||
{
|
||
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, size_t nrLists, Value * * lists, const Pos & pos)
|
||
{
|
||
nrListConcats++;
|
||
|
||
Value * nonEmpty = 0;
|
||
size_t len = 0;
|
||
for (size_t n = 0; n < nrLists; ++n) {
|
||
forceList(*lists[n], pos);
|
||
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::ostringstream s;
|
||
NixInt n = 0;
|
||
NixFloat nf = 0;
|
||
|
||
bool first = !forceString;
|
||
ValueType firstType = nString;
|
||
|
||
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 == 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(pos, "cannot add %1% to an integer", showType(vTmp));
|
||
} else if (firstType == nFloat) {
|
||
if (vTmp.type() == nInt) {
|
||
nf += vTmp.integer;
|
||
} else if (vTmp.type() == nFloat) {
|
||
nf += vTmp.fpoint;
|
||
} else
|
||
throwEvalError(pos, "cannot add %1% to a float", showType(vTmp));
|
||
} else
|
||
s << state.coerceToString(pos, vTmp, context, false, firstType == nString);
|
||
}
|
||
|
||
if (firstType == nInt)
|
||
mkInt(v, n);
|
||
else if (firstType == nFloat)
|
||
mkFloat(v, nf);
|
||
else if (firstType == nPath) {
|
||
if (!context.empty())
|
||
throwEvalError(pos, "a string that refers to a store path cannot be appended to a path");
|
||
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.insert(&v).second) return;
|
||
|
||
forceValue(v);
|
||
|
||
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 (size_t 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() != nInt)
|
||
throwTypeError(pos, "value is %1% while an integer was expected", v);
|
||
return v.integer;
|
||
}
|
||
|
||
|
||
NixFloat EvalState::forceFloat(Value & v, const Pos & pos)
|
||
{
|
||
forceValue(v, pos);
|
||
if (v.type() == nInt)
|
||
return v.integer;
|
||
else if (v.type() != nFloat)
|
||
throwTypeError(pos, "value is %1% while a float was expected", v);
|
||
return v.fpoint;
|
||
}
|
||
|
||
|
||
bool EvalState::forceBool(Value & v, const Pos & pos)
|
||
{
|
||
forceValue(v, pos);
|
||
if (v.type() != nBool)
|
||
throwTypeError(pos, "value is %1% while a Boolean was expected", v);
|
||
return v.boolean;
|
||
}
|
||
|
||
|
||
bool EvalState::isFunctor(Value & fun)
|
||
{
|
||
return fun.type() == nAttrs && fun.attrs->find(sFunctor) != fun.attrs->end();
|
||
}
|
||
|
||
|
||
void EvalState::forceFunction(Value & v, const Pos & pos)
|
||
{
|
||
forceValue(v, pos);
|
||
if (v.type() != nFunction && !isFunctor(v))
|
||
throwTypeError(pos, "value is %1% while a function was expected", v);
|
||
}
|
||
|
||
|
||
string EvalState::forceString(Value & v, const Pos & pos)
|
||
{
|
||
forceValue(v, pos);
|
||
if (v.type() != nString) {
|
||
if (pos)
|
||
throwTypeError(pos, "value is %1% while a string was expected", v);
|
||
else
|
||
throwTypeError("value is %1% while a string was expected", v);
|
||
}
|
||
return string(v.string.s);
|
||
}
|
||
|
||
|
||
/* Decode a context string ‘!<name>!<path>’ into a pair <path,
|
||
name>. */
|
||
std::pair<string, 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;
|
||
}
|
||
|
||
|
||
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(pos, "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;
|
||
}
|
||
|
||
|
||
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);
|
||
if (i->value->type() != nString) return false;
|
||
return strcmp(i->value->string.s, "derivation") == 0;
|
||
}
|
||
|
||
|
||
std::optional<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);
|
||
}
|
||
|
||
return {};
|
||
}
|
||
|
||
string EvalState::coerceToString(const Pos & pos, Value & v, PathSet & context,
|
||
bool coerceMore, bool copyToStore)
|
||
{
|
||
forceValue(v, pos);
|
||
|
||
string s;
|
||
|
||
if (v.type() == nString) {
|
||
copyContext(v, context);
|
||
return v.string.s;
|
||
}
|
||
|
||
if (v.type() == nPath) {
|
||
Path path(canonPath(v.path));
|
||
return copyToStore ? copyPathToStore(context, path) : path;
|
||
}
|
||
|
||
if (v.type() == nAttrs) {
|
||
auto maybeString = tryAttrsToString(pos, v, context, coerceMore, copyToStore);
|
||
if (maybeString) {
|
||
return *maybeString;
|
||
}
|
||
auto i = v.attrs->find(sOutPath);
|
||
if (i == v.attrs->end()) throwTypeError(pos, "cannot coerce a set to a string");
|
||
return coerceToString(pos, *i->value, context, coerceMore, copyToStore);
|
||
}
|
||
|
||
if (v.type() == nExternal)
|
||
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() == 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()) {
|
||
string result;
|
||
for (size_t 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(pos, "cannot coerce %1% to a string", v);
|
||
}
|
||
|
||
|
||
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);
|
||
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)
|
||
{
|
||
string path = coerceToString(pos, v, context, false, false);
|
||
if (path == "" || path[0] != '/')
|
||
throwEvalError(pos, "string '%1%' doesn't represent an absolute path", path);
|
||
return path;
|
||
}
|
||
|
||
|
||
bool EvalState::eqValues(Value & v1, Value & v2)
|
||
{
|
||
forceValue(v1);
|
||
forceValue(v2);
|
||
|
||
/* !!! Hack to support some old broken code that relies on pointer
|
||
equality tests between 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])) 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);
|
||
}
|
||
|
||
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 nFunction:
|
||
return false;
|
||
|
||
case nExternal:
|
||
return *v1.external == *v2.external;
|
||
|
||
case nFloat:
|
||
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").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 string &) i.first->name);
|
||
else
|
||
obj.attr("name", nullptr);
|
||
if (i.first->pos) {
|
||
obj.attr("file", (const 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 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); });
|
||
}
|
||
}
|
||
}
|
||
|
||
|
||
string ExternalValueBase::coerceToString(const Pos & pos, PathSet & context, bool copyMore, bool copyToStore) const
|
||
{
|
||
throw TypeError({
|
||
.msg = hintfmt("cannot coerce %1% to a string", showType()),
|
||
.errPos = pos
|
||
});
|
||
}
|
||
|
||
|
||
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);
|
||
|
||
|
||
}
|