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/* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
/*
* Main authors:
* Guido Tack <guido.tack@monash.edu>
*/
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include <minizinc/flat_exp.hh>
namespace MiniZinc {
EE flatten_let(EnvI& env, const Ctx& ctx, Expression* e, VarDecl* r, VarDecl* b) {
CallStackItem _csi(env, e);
EE ret;
Let* let = Expression::cast<Let>(e);
std::vector<EE> cs;
std::vector<KeepAlive> flatmap;
{
LetPushBindings lpb(let);
for (unsigned int i = 0; i < let->let().size(); i++) {
Expression* le = let->let()[i];
if (auto* vd = Expression::dynamicCast<VarDecl>(le)) {
Expression* let_e = nullptr;
if (vd->e() != nullptr) {
Ctx nctx = ctx;
BCtx transfer_ctx = let->type().bt() == Type::BT_INT ? nctx.i : nctx.b;
nctx.neg = false;
if (Expression::ann(vd).contains(env.constants.ctx.promise_monotone)) {
if (Expression::type(vd->e()).bt() == Type::BT_BOOL) {
nctx.b = +transfer_ctx;
} else {
nctx.i = +transfer_ctx;
}
} else if (Expression::ann(vd).contains(env.constants.ctx.promise_antitone)) {
if (Expression::type(vd->e()).bt() == Type::BT_BOOL) {
nctx.b = -transfer_ctx;
} else {
nctx.i = -transfer_ctx;
}
} else if (Expression::type(vd->e()).bt() == Type::BT_BOOL) {
nctx.b = C_MIX;
}
CallStackItem csi_vd(env, vd);
EE ee = flat_exp(env, nctx, vd->e(), nullptr, nctx.partialityVar(env));
let_e = ee.r();
cs.push_back(ee);
check_index_sets(env, vd, let_e);
if (vd->ti()->domain() != nullptr) {
GCLock lock;
auto* c = mk_domain_constraint(env, ee.r(), vd->ti()->domain());
if (c != nullptr) {
VarDecl* b_b = (nctx.b == C_ROOT && b == env.constants.varTrue) ? b : nullptr;
VarDecl* r_r = (nctx.b == C_ROOT && b == env.constants.varTrue) ? b : nullptr;
ee = flat_exp(env, nctx, c, r_r, b_b);
cs.push_back(ee);
ee.b = ee.r;
cs.push_back(ee);
}
}
vd->e(let_e);
flatten_vardecl_annotations(env, vd, nullptr, vd);
} else {
if ((ctx.b == C_NEG || ctx.b == C_MIX) &&
!Expression::ann(vd).contains(env.constants.ann.promise_total)) {
CallStackItem csi_vd(env, vd);
throw FlatteningError(env, Expression::loc(vd),
"free variable in non-positive context");
}
CallStackItem csi_vd(env, vd);
GCLock lock;
TypeInst* ti = eval_typeinst(env, ctx, vd);
VarDecl* nvd = new_vardecl(env, ctx, ti, nullptr, vd, nullptr);
let_e = nvd->id();
vd->e(let_e);
}
flatmap.emplace_back(vd->flat());
if (Id* id = Expression::dynamicCast<Id>(let_e)) {
vd->flat(id->decl());
} else {
vd->flat(vd);
}
} else {
if (ctx.b == C_ROOT || Expression::ann(le).contains(env.constants.ann.promise_total)) {
(void)flat_exp(env, Ctx(), le, env.constants.varTrue, env.constants.varTrue);
} else {
Ctx nctx = ctx;
nctx.neg = false;
EE ee = flat_exp(env, nctx, le, nullptr, env.constants.varTrue);
ee.b = ee.r;
cs.push_back(ee);
}
}
}
if (r == env.constants.varTrue && ctx.b == C_ROOT && !ctx.neg) {
ret.b = bind(env, Ctx(), b, env.constants.literalTrue);
(void)flat_exp(env, ctx, let->in(), r, b);
ret.r = conj(env, r, Ctx(), cs);
} else {
Ctx nctx = ctx;
nctx.neg = false;
VarDecl* bb = b;
for (EE& ee : cs) {
if (ee.b() != env.constants.literalTrue) {
bb = nullptr;
break;
}
}
EE ee = flat_exp(env, nctx, let->in(), nullptr, bb);
if (let->type().isbool() && !let->type().isOpt()) {
ee.b = ee.r;
cs.push_back(ee);
ret.r = conj(env, r, ctx, cs);
ret.b = bind(env, Ctx(), b, env.constants.literalTrue);
} else {
cs.push_back(ee);
ret.r = bind(env, Ctx(), r, ee.r());
ret.b = conj(env, b, Ctx(), cs);
}
}
}
// Restore previous mapping
for (unsigned int i = 0, j = 0; i < let->let().size(); i++) {
if (auto* vd = Expression::dynamicCast<VarDecl>(let->let()[i])) {
vd->flat(Expression::cast<VarDecl>(flatmap[j++]()));
}
}
return ret;
}
} // namespace MiniZinc
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