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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_par(EnvI& env, const Ctx& ctx, Expression* e, VarDecl* r, VarDecl* b) {
EE ret;
if (Expression::type(e).cv()) {
CallStackItem _csi(env, e);
Ctx nctx;
nctx.b = ctx.b == C_ROOT ? C_ROOT : C_MIX;
try {
KeepAlive ka = flat_cv_exp(env, nctx, e);
ret.r = bind(env, ctx, r, ka());
ret.b = bind(env, Ctx(), b, env.constants.literalTrue);
} catch (ResultUndefinedError&) {
if (Expression::type(e).isbool()) {
ret.r = bind(env, ctx, r, env.constants.literalFalse);
ret.b = bind(env, Ctx(), b, env.constants.literalTrue);
} else {
ret.r = create_dummy_value(env, Expression::type(e));
ret.b = bind(env, Ctx(), b, env.constants.literalFalse);
}
}
return ret;
}
if (Expression::type(e).dim() > 0) {
auto* ident = Expression::dynamicCast<Id>(e);
if (ident != nullptr) {
Expression* e_val = follow_id_to_decl(ident);
if (Expression::isa<Id>(e_val)) {
ident = Expression::cast<Id>(e_val);
} else if (Expression::isa<VarDecl>(e_val)) {
ident = Expression::cast<VarDecl>(e_val)->id();
}
if (ident->decl()->flat() == nullptr || ident->decl()->toplevel()) {
CallStackItem _csi(env, e);
VarDecl* vd = ident->decl()->flat();
if (vd == nullptr) {
EE flat_ident = flat_exp(env, Ctx(), ident->decl(), nullptr, env.constants.varTrue);
vd = Expression::cast<Id>(flat_ident.r())->decl();
ident->decl()->flat(vd);
auto* al = Expression::cast<ArrayLit>(follow_id(vd->id()));
if (al->empty()) {
if (r == nullptr) {
ret.r = al;
} else {
ret.r = bind(env, ctx, r, al);
}
ret.b = bind(env, Ctx(), b, env.constants.literalTrue);
return ret;
}
}
ret.r = bind(env, ctx, r, ident->decl()->flat()->id());
ret.b = bind(env, Ctx(), b, env.constants.literalTrue);
return ret;
}
}
auto it = env.cseMapFind(e);
if (it != env.cseMapEnd()) {
ret.r = bind(env, ctx, r, Expression::cast<VarDecl>(it->second.r)->id());
ret.b = bind(env, Ctx(), b, env.constants.literalTrue);
return ret;
}
GCLock lock;
ArrayLit* al = nullptr;
try {
al = Expression::cast<ArrayLit>(follow_id(eval_par(env, e)));
} catch (ResultUndefinedError&) {
ret.r = create_dummy_value(env, Expression::type(e));
ret.b = bind(env, Ctx(), b, env.constants.literalFalse);
return ret;
}
CallStackItem _csi(env, e);
if (al->empty() || ((r != nullptr) && r->e() == nullptr)) {
if (r == nullptr) {
ret.r = al;
} else {
ret.r = bind(env, ctx, r, al);
}
ret.b = bind(env, Ctx(), b, env.constants.literalTrue);
return ret;
}
it = env.cseMapFind(al);
if (it != env.cseMapEnd()) {
ret.r = bind(env, ctx, r, Expression::cast<VarDecl>(it->second.r)->id());
ret.b = bind(env, Ctx(), b, env.constants.literalTrue);
return ret;
}
std::vector<TypeInst*> ranges(al->dims());
for (unsigned int i = 0; i < ranges.size(); i++) {
ranges[i] =
new TypeInst(Expression::loc(e), Type(),
new SetLit(Location().introduce(), IntSetVal::a(al->min(i), al->max(i))));
}
ASTExprVec<TypeInst> ranges_v(ranges);
auto* ti = new TypeInst(Expression::loc(e), al->type(), ranges_v, nullptr);
VarDecl* vd = new_vardecl(env, ctx, ti, nullptr, nullptr, al);
EE ee(vd, nullptr);
env.cseMapInsert(al, ee);
env.cseMapInsert(vd->e(), ee);
ret.r = bind(env, ctx, r, vd->id());
ret.b = bind(env, Ctx(), b, env.constants.literalTrue);
return ret;
}
GCLock lock;
try {
auto* result = eval_par(env, e);
if (Expression::type(result) == Type::parbool()) {
if (ctx.b == C_ROOT && r == env.constants.varTrue && result == env.constants.boollit(false)) {
env.fail("expression evaluated to false", Expression::loc(e));
}
}
ret.r = bind(env, ctx, r, result);
ret.b = bind(env, Ctx(), b, env.constants.literalTrue);
} catch (ResultUndefinedError&) {
ret.r = create_dummy_value(env, Expression::type(e));
ret.b = bind(env, Ctx(), b, env.constants.literalFalse);
}
return ret;
}
} // namespace MiniZinc
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