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add `mod' and bitwise builtins

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This commit is contained in:
volth 2018-05-12 16:50:39 +00:00
parent 1ad19232c4
commit 8a6a14e1f5
2 changed files with 60 additions and 0 deletions
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7
src/libexpr/parser.y
View file

@ -338,6 +338,13 @@ expr_op
| expr_op '-' expr_op { $$ = new ExprApp(CUR_POS, new ExprApp(new ExprVar(data->symbols.create("__sub")), $1), $3); }
| expr_op '*' expr_op { $$ = new ExprApp(CUR_POS, new ExprApp(new ExprVar(data->symbols.create("__mul")), $1), $3); }
| expr_op '/' expr_op { $$ = new ExprApp(CUR_POS, new ExprApp(new ExprVar(data->symbols.create("__div")), $1), $3); }
| expr_op '%' expr_op { $$ = new ExprApp(CUR_POS, new ExprApp(new ExprVar(data->symbols.create("__mod")), $1), $3); }
| expr_op '&' expr_op { $$ = new ExprApp(CUR_POS, new ExprApp(new ExprVar(data->symbols.create("__bin_and")), $1), $3); }
| expr_op '|' expr_op { $$ = new ExprApp(CUR_POS, new ExprApp(new ExprVar(data->symbols.create("__bin_or")), $1), $3); }
| expr_op '^' expr_op { $$ = new ExprApp(CUR_POS, new ExprApp(new ExprVar(data->symbols.create("__bin_xor")), $1), $3); }
| expr_op '<<' expr_op { $$ = new ExprApp(CUR_POS, new ExprApp(new ExprVar(data->symbols.create("__bin_shl")), $1), $3); }
| expr_op '>>>' expr_op { $$ = new ExprApp(CUR_POS, new ExprApp(new ExprVar(data->symbols.create("__bin_unsigned_shr")), $1), $3); }
| expr_op '>>' expr_op { $$ = new ExprApp(CUR_POS, new ExprApp(new ExprVar(data->symbols.create("__bin_signed_shr")), $1), $3); }
| expr_op CONCAT expr_op { $$ = new ExprOpConcatLists(CUR_POS, $1, $3); }
| expr_app
;

53
src/libexpr/primops.cc
View file

@ -1676,6 +1676,52 @@ static void prim_div(EvalState & state, const Pos & pos, Value * * args, Value &
}
}
static void prim_mod(EvalState & state, const Pos & pos, Value * * args, Value & v)
{
NixFloat f2 = state.forceFloat(*args[1], pos);
if (f2 == 0) throw EvalError(format("division by zero, at %1%") % pos);
if (args[0]->type == tFloat || args[1]->type == tFloat) {
mkFloat(v, state.forceFloat(*args[0], pos) % state.forceFloat(*args[1], pos));
} else {
NixInt i1 = state.forceInt(*args[0], pos);
NixInt i2 = state.forceInt(*args[1], pos);
/* Avoid division overflow as it might raise SIGFPE. */
if (i1 == std::numeric_limits<NixInt>::min() && i2 == -1)
throw EvalError(format("overflow in integer division, at %1%") % pos);
mkInt(v, i1 % i2);
}
}
static void prim_bin_and(EvalState & state, const Pos & pos, Value * * args, Value & v)
{
mkInt(v, state.forceInt(*args[0], pos) & state.forceInt(*args[1], pos));
}
static void prim_bin_or(EvalState & state, const Pos & pos, Value * * args, Value & v)
{
mkInt(v, state.forceInt(*args[0], pos) | state.forceInt(*args[1], pos));
}
static void prim_bin_xor(EvalState & state, const Pos & pos, Value * * args, Value & v)
{
mkInt(v, state.forceInt(*args[0], pos) ^ state.forceInt(*args[1], pos));
}
static void prim_bin_shl(EvalState & state, const Pos & pos, Value * * args, Value & v)
{
mkInt(v, state.forceInt(*args[0], pos) << (state.forceInt(*args[1], pos) & 63));
}
static void prim_bin_unsigned_shr(EvalState & state, const Pos & pos, Value * * args, Value & v)
{
mkInt(v, (unsigned long)state.forceInt(*args[0], pos) >> (state.forceInt(*args[1], pos) & 63));
}
static void prim_bin_signed_shr(EvalState & state, const Pos & pos, Value * * args, Value & v)
{
mkInt(v, (signed long)state.forceInt(*args[0], pos) >> (state.forceInt(*args[1], pos) & 63));
}
static void prim_lessThan(EvalState & state, const Pos & pos, Value * * args, Value & v)
{
@ -2221,6 +2267,13 @@ void EvalState::createBaseEnv()
addPrimOp("__sub", 2, prim_sub);
addPrimOp("__mul", 2, prim_mul);
addPrimOp("__div", 2, prim_div);
addPrimOp("__mod", 2, prim_mod);
addPrimOp("__bin_and", 2, prim_bin_and);
addPrimOp("__bin_or", 2, prim_bin_or);
addPrimOp("__bin_xor", 2, prim_bin_xor);
addPrimOp("__bin_shl", 2, prim_bin_shl);
addPrimOp("__bin_unsigned_shr", 2, prim_bin_unsigned_shr);
addPrimOp("__bin_signed_shr", 2, prim_bin_signed_shr);
addPrimOp("__lessThan", 2, prim_lessThan);
// String manipulation