forked from lix-project/lix
297 lines
8.5 KiB
C++
297 lines
8.5 KiB
C++
#pragma once
|
||
|
||
#include "attr-set.hh"
|
||
#include "value.hh"
|
||
#include "nixexpr.hh"
|
||
#include "symbol-table.hh"
|
||
#include "hash.hh"
|
||
|
||
#include <map>
|
||
|
||
#if HAVE_BOEHMGC
|
||
#include <gc/gc_allocator.h>
|
||
#endif
|
||
|
||
|
||
namespace nix {
|
||
|
||
|
||
class EvalState;
|
||
|
||
|
||
typedef void (* PrimOpFun) (EvalState & state, const Pos & pos, Value * * args, Value & v);
|
||
|
||
|
||
struct PrimOp
|
||
{
|
||
PrimOpFun fun;
|
||
unsigned int arity;
|
||
Symbol name;
|
||
PrimOp(PrimOpFun fun, unsigned int arity, Symbol name)
|
||
: fun(fun), arity(arity), name(name) { }
|
||
};
|
||
|
||
|
||
struct Env
|
||
{
|
||
Env * up;
|
||
unsigned short size; // used by ‘valueSize’
|
||
unsigned short prevWith:15; // nr of levels up to next `with' environment
|
||
unsigned short haveWithAttrs:1;
|
||
Value * values[0];
|
||
};
|
||
|
||
|
||
void mkString(Value & v, const string & s, const PathSet & context = PathSet());
|
||
|
||
void copyContext(const Value & v, PathSet & context);
|
||
|
||
|
||
/* Cache for calls to addToStore(); maps source paths to the store
|
||
paths. */
|
||
typedef std::map<Path, Path> SrcToStore;
|
||
|
||
|
||
std::ostream & operator << (std::ostream & str, const Value & v);
|
||
|
||
|
||
typedef list<std::pair<string, Path> > SearchPath;
|
||
|
||
|
||
/* Initialise the Boehm GC, if applicable. */
|
||
void initGC();
|
||
|
||
|
||
class EvalState
|
||
{
|
||
public:
|
||
SymbolTable symbols;
|
||
|
||
const Symbol sWith, sOutPath, sDrvPath, sType, sMeta, sName, sValue,
|
||
sSystem, sOverrides, sOutputs, sOutputName, sIgnoreNulls,
|
||
sFile, sLine, sColumn, sFunctor;
|
||
Symbol sDerivationNix;
|
||
|
||
/* If set, force copying files to the Nix store even if they
|
||
already exist there. */
|
||
bool repair = false;
|
||
|
||
/* If set, don't allow access to files outside of the Nix search
|
||
path or to environment variables. */
|
||
bool restricted;
|
||
|
||
Value vEmptySet;
|
||
|
||
private:
|
||
SrcToStore srcToStore;
|
||
|
||
/* A cache from path names to values. */
|
||
#if HAVE_BOEHMGC
|
||
typedef std::map<Path, Value, std::less<Path>, traceable_allocator<std::pair<const Path, Value> > > FileEvalCache;
|
||
#else
|
||
typedef std::map<Path, Value> FileEvalCache;
|
||
#endif
|
||
FileEvalCache fileEvalCache;
|
||
|
||
SearchPath searchPath;
|
||
|
||
public:
|
||
|
||
EvalState(const Strings & _searchPath);
|
||
~EvalState();
|
||
|
||
void addToSearchPath(const string & s, bool warn = false);
|
||
|
||
Path checkSourcePath(const Path & path);
|
||
|
||
/* Parse a Nix expression from the specified file. */
|
||
Expr * parseExprFromFile(const Path & path);
|
||
Expr * parseExprFromFile(const Path & path, StaticEnv & staticEnv);
|
||
|
||
/* Parse a Nix expression from the specified string. */
|
||
Expr * parseExprFromString(const string & s, const Path & basePath, StaticEnv & staticEnv);
|
||
Expr * parseExprFromString(const string & s, const Path & basePath);
|
||
|
||
/* Evaluate an expression read from the given file to normal
|
||
form. */
|
||
void evalFile(const Path & path, Value & v);
|
||
|
||
void resetFileCache();
|
||
|
||
/* Look up a file in the search path. */
|
||
Path findFile(const string & path);
|
||
Path findFile(SearchPath & searchPath, const string & path, const Pos & pos = noPos);
|
||
|
||
/* Evaluate an expression to normal form, storing the result in
|
||
value `v'. */
|
||
void eval(Expr * e, Value & v);
|
||
|
||
/* Evaluation the expression, then verify that it has the expected
|
||
type. */
|
||
inline bool evalBool(Env & env, Expr * e);
|
||
inline bool evalBool(Env & env, Expr * e, const Pos & pos);
|
||
inline void evalAttrs(Env & env, Expr * e, Value & v);
|
||
|
||
/* If `v' is a thunk, enter it and overwrite `v' with the result
|
||
of the evaluation of the thunk. If `v' is a delayed function
|
||
application, call the function and overwrite `v' with the
|
||
result. Otherwise, this is a no-op. */
|
||
inline void forceValue(Value & v, const Pos & pos = noPos);
|
||
|
||
/* Force a value, then recursively force list elements and
|
||
attributes. */
|
||
void forceValueDeep(Value & v);
|
||
|
||
/* Force `v', and then verify that it has the expected type. */
|
||
NixInt forceInt(Value & v, const Pos & pos);
|
||
NixFloat forceFloat(Value & v, const Pos & pos);
|
||
bool forceBool(Value & v);
|
||
inline void forceAttrs(Value & v);
|
||
inline void forceAttrs(Value & v, const Pos & pos);
|
||
inline void forceList(Value & v);
|
||
inline void forceList(Value & v, const Pos & pos);
|
||
void forceFunction(Value & v, const Pos & pos); // either lambda or primop
|
||
string forceString(Value & v, const Pos & pos = noPos);
|
||
string forceString(Value & v, PathSet & context, const Pos & pos = noPos);
|
||
string forceStringNoCtx(Value & v, const Pos & pos = noPos);
|
||
|
||
/* Return true iff the value `v' denotes a derivation (i.e. a
|
||
set with attribute `type = "derivation"'). */
|
||
bool isDerivation(Value & v);
|
||
|
||
/* String coercion. Converts strings, paths and derivations to a
|
||
string. If `coerceMore' is set, also converts nulls, integers,
|
||
booleans and lists to a string. If `copyToStore' is set,
|
||
referenced paths are copied to the Nix store as a side effect. */
|
||
string coerceToString(const Pos & pos, Value & v, PathSet & context,
|
||
bool coerceMore = false, bool copyToStore = true);
|
||
|
||
string copyPathToStore(PathSet & context, const Path & path);
|
||
|
||
/* Path coercion. Converts strings, paths and derivations to a
|
||
path. The result is guaranteed to be a canonicalised, absolute
|
||
path. Nothing is copied to the store. */
|
||
Path coerceToPath(const Pos & pos, Value & v, PathSet & context);
|
||
|
||
public:
|
||
|
||
/* The base environment, containing the builtin functions and
|
||
values. */
|
||
Env & baseEnv;
|
||
|
||
/* The same, but used during parsing to resolve variables. */
|
||
StaticEnv staticBaseEnv; // !!! should be private
|
||
|
||
private:
|
||
|
||
unsigned int baseEnvDispl = 0;
|
||
|
||
void createBaseEnv();
|
||
|
||
void addConstant(const string & name, Value & v);
|
||
|
||
void addPrimOp(const string & name,
|
||
unsigned int arity, PrimOpFun primOp);
|
||
|
||
public:
|
||
|
||
void getBuiltin(const string & name, Value & v);
|
||
|
||
private:
|
||
|
||
inline Value * lookupVar(Env * env, const ExprVar & var, bool noEval);
|
||
|
||
friend struct ExprVar;
|
||
friend struct ExprAttrs;
|
||
friend struct ExprLet;
|
||
|
||
Expr * parse(const char * text, const Path & path,
|
||
const Path & basePath, StaticEnv & staticEnv);
|
||
|
||
public:
|
||
|
||
/* Do a deep equality test between two values. That is, list
|
||
elements and attributes are compared recursively. */
|
||
bool eqValues(Value & v1, Value & v2);
|
||
|
||
bool isFunctor(Value & fun);
|
||
|
||
void callFunction(Value & fun, Value & arg, Value & v, const Pos & pos);
|
||
void callPrimOp(Value & fun, Value & arg, Value & v, const Pos & pos);
|
||
|
||
/* Automatically call a function for which each argument has a
|
||
default value or has a binding in the `args' map. */
|
||
void autoCallFunction(Bindings & args, Value & fun, Value & res);
|
||
|
||
/* Allocation primitives. */
|
||
Value * allocValue();
|
||
Env & allocEnv(unsigned int size);
|
||
|
||
Value * allocAttr(Value & vAttrs, const Symbol & name);
|
||
|
||
Bindings * allocBindings(Bindings::size_t capacity);
|
||
|
||
void mkList(Value & v, unsigned int length);
|
||
void mkAttrs(Value & v, unsigned int capacity);
|
||
void mkThunk_(Value & v, Expr * expr);
|
||
void mkPos(Value & v, Pos * pos);
|
||
|
||
void concatLists(Value & v, unsigned int nrLists, Value * * lists, const Pos & pos);
|
||
|
||
/* Print statistics. */
|
||
void printStats();
|
||
|
||
private:
|
||
|
||
unsigned long nrEnvs = 0;
|
||
unsigned long nrValuesInEnvs = 0;
|
||
unsigned long nrValues = 0;
|
||
unsigned long nrListElems = 0;
|
||
unsigned long nrAttrsets = 0;
|
||
unsigned long nrAttrsInAttrsets = 0;
|
||
unsigned long nrOpUpdates = 0;
|
||
unsigned long nrOpUpdateValuesCopied = 0;
|
||
unsigned long nrListConcats = 0;
|
||
unsigned long nrPrimOpCalls = 0;
|
||
unsigned long nrFunctionCalls = 0;
|
||
|
||
bool countCalls;
|
||
|
||
typedef std::map<Symbol, unsigned int> PrimOpCalls;
|
||
PrimOpCalls primOpCalls;
|
||
|
||
typedef std::map<ExprLambda *, unsigned int> FunctionCalls;
|
||
FunctionCalls functionCalls;
|
||
|
||
void incrFunctionCall(ExprLambda * fun);
|
||
|
||
typedef std::map<Pos, unsigned int> AttrSelects;
|
||
AttrSelects attrSelects;
|
||
|
||
friend struct ExprOpUpdate;
|
||
friend struct ExprOpConcatLists;
|
||
friend struct ExprSelect;
|
||
friend void prim_getAttr(EvalState & state, const Pos & pos, Value * * args, Value & v);
|
||
};
|
||
|
||
|
||
/* Return a string representing the type of the value `v'. */
|
||
string showType(const Value & v);
|
||
|
||
|
||
/* If `path' refers to a directory, then append "/default.nix". */
|
||
Path resolveExprPath(Path path);
|
||
|
||
struct InvalidPathError : EvalError
|
||
{
|
||
Path path;
|
||
InvalidPathError(const Path & path);
|
||
#ifdef EXCEPTION_NEEDS_THROW_SPEC
|
||
~InvalidPathError() throw () { };
|
||
#endif
|
||
};
|
||
|
||
/* Realise all paths in `context' */
|
||
void realiseContext(const PathSet & context);
|
||
|
||
}
|