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/*****
* newexp.cc
* Andy Hammerlindl 2003/07/28
*
* Handles the abstract syntax for expressions the create new objects,
* such as record, array, and function constructors.
*****/
#include "newexp.h"
#include "stm.h"
#include "runtime.h"
#include "runarray.h"
#include "coenv.h"
#include "inst.h"
using namespace types;
using trans::coder;
using trans::coenv;
using vm::inst;
namespace absyntax {
void printFrame(frame *f) {
if (f == 0) {
cerr << '0';
}
else {
cerr << f << " of ";
printFrame(f->getParent());
}
}
bool newRecordExp::encodeLevel(position pos, coenv &e, trans::tyEntry *ent)
{
record *r = dynamic_cast<record *>(ent->t);
assert(r);
// The level needed on which to allocate the record.
frame *level = r->getLevel()->getParent();
if (ent->v) {
// Put the record on the stack. For instance, in code like
// import imp;
// new imp.t;
// we are putting the instance of imp on the stack, so we can use it to
// allocate an instance of imp.t.
ent->v->getLocation()->encode(trans::READ, pos, e.c);
// Adjust to the right frame. For instance, in the last new in
// struct A {
// struct B {
// static struct C {}
// }
// B b=new B;
// }
// A a=new A;
// new a.b.C;
// we push a.b onto the stack, but need a as the enclosing frame for
// allocating an instance of C.
record *q = dynamic_cast<record *>(ent->v->getType());
return e.c.encode(level, q->getLevel());
}
else
return e.c.encode(level);
}
types::ty *newRecordExp::transFromTyEntry(position pos, coenv &e,
trans::tyEntry *ent)
{
types::ty *t = ent->t;
if (t->kind == ty_error)
return t;
else if (t->kind != ty_record) {
em.error(pos);
em << "type '" << *t << "' is not a structure";
return primError();
}
// Put the enclosing frame on the stack.
if (!encodeLevel(pos, e, ent)) {
em.error(pos);
em << "allocation of struct '" << *t << "' is not in a valid scope";
return primError();
}
record *r = dynamic_cast<record *>(t);
assert(r);
// Encode the allocation.
e.c.encode(inst::makefunc,r->getInit());
e.c.encode(inst::popcall);
return t;
}
types::ty *newRecordExp::trans(coenv &e)
{
return transFromTyEntry(getPos(), e, result->transAsTyEntry(e, 0));
}
types::ty *newRecordExp::getType(coenv &e)
{
types::ty *t = result->trans(e, true);
if (t->kind != ty_error && t->kind != ty_record)
return primError();
else
return t;
}
void newArrayExp::prettyprint(ostream &out, Int indent)
{
prettyname(out,"newArrayExp",indent);
celltype->prettyprint(out, indent+1);
if (dimexps) dimexps->prettyprint(out, indent+1);
if (dims) dims->prettyprint(out, indent+1);
if (ai) ai->prettyprint(out, indent+1);
}
types::ty *newArrayExp::trans(coenv &e)
{
types::ty *c = celltype->trans(e);
if (c->kind == ty_void) {
em.error(getPos());
em << "cannot declare array of type void";
return primError();
}
if (dims)
c = dims->truetype(c);
if (ai) {
ai->transToType(e, c);
return c;
} else if (dimexps || dims) {
if (dimexps) {
for (size_t i = 0; i < dimexps->size(); ++i) {
(*dimexps)[i]->transToType(e, types::primInt());
c = new types::array(c);
}
}
if (dims) {
for (size_t i = 0; i < dims->size(); ++i) {
e.c.encode(inst::intpush,0);
}
}
e.c.encode(inst::intpush,
(Int) ((dimexps ? dimexps->size():0)
+ (dims ? dims->size():0)));
e.c.encode(inst::builtin, run::newDeepArray);
return c;
} else {
em.compiler(getPos());
em << "new array expression must have either dims or dimexps";
return primError();
}
}
types::ty *newArrayExp::getType(coenv &e)
{
types::ty *c = celltype->trans(e);
if (c->kind == ty_void) {
return primError();
}
if (dims)
c = dims->truetype(c);
if (dimexps) {
Int depth = (Int)dimexps->size();
while (depth > 0) {
c = new types::array(c);
depth--;
}
}
return c;
}
} // namespace absyntax
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