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/* Compiler implementation of the D programming language
* Copyright (C) 1999-2020 by The D Language Foundation, All Rights Reserved
* written by Walter Bright
* http://www.digitalmars.com
* Distributed under the Boost Software License, Version 1.0.
* http://www.boost.org/LICENSE_1_0.txt
* https://github.com/D-Programming-Language/dmd/blob/master/src/nogc.c
*/
#include "mars.h"
#include "init.h"
#include "visitor.h"
#include "expression.h"
#include "statement.h"
#include "declaration.h"
#include "id.h"
#include "module.h"
#include "scope.h"
#include "tokens.h"
#include "aggregate.h"
bool walkPostorder(Expression *e, StoppableVisitor *v);
void FuncDeclaration::printGCUsage(Loc loc, const char* warn)
{
if (!global.params.vgc)
return;
Module *m = getModule();
if (m && m->isRoot() && !inUnittest())
{
message(loc, "vgc: %s", warn);
}
}
/**************************************
* Look for GC-allocations
*/
class NOGCVisitor : public StoppableVisitor
{
public:
FuncDeclaration *f;
bool err;
NOGCVisitor(FuncDeclaration *f)
{
this->f = f;
this->err = false;
}
void doCond(Expression *exp)
{
if (exp)
walkPostorder(exp, this);
}
void visit(Expression *)
{
}
void visit(DeclarationExp *e)
{
// Note that, walkPostorder does not support DeclarationExp today.
VarDeclaration *v = e->declaration->isVarDeclaration();
if (v && !(v->storage_class & STCmanifest) && !v->isDataseg() && v->_init)
{
if (ExpInitializer *ei = v->_init->isExpInitializer())
{
doCond(ei->exp);
}
}
}
void visit(CallExp *)
{
}
void visit(ArrayLiteralExp *e)
{
if (e->type->ty != Tarray || !e->elements || !e->elements->length)
return;
if (f->setGC())
{
e->error("array literal in @nogc %s '%s' may cause GC allocation",
f->kind(), f->toPrettyChars());
err = true;
return;
}
f->printGCUsage(e->loc, "array literal may cause GC allocation");
}
void visit(AssocArrayLiteralExp *e)
{
if (!e->keys->length)
return;
if (f->setGC())
{
e->error("associative array literal in @nogc %s '%s' may cause GC allocation",
f->kind(), f->toPrettyChars());
err = true;
return;
}
f->printGCUsage(e->loc, "associative array literal may cause GC allocation");
}
void visit(NewExp *e)
{
if (e->member && !e->member->isNogc() && f->setGC())
{
// @nogc-ness is already checked in NewExp::semantic
return;
}
if (e->onstack)
return;
if (e->allocator)
return;
if (f->setGC())
{
e->error("cannot use 'new' in @nogc %s '%s'",
f->kind(), f->toPrettyChars());
err = true;
return;
}
f->printGCUsage(e->loc, "'new' causes GC allocation");
}
void visit(DeleteExp *e)
{
if (e->e1->op == TOKvar)
{
VarDeclaration *v = ((VarExp *)e->e1)->var->isVarDeclaration();
if (v && v->onstack)
return; // delete for scope allocated class object
}
Type *tb = e->e1->type->toBasetype();
AggregateDeclaration *ad = NULL;
switch (tb->ty)
{
case Tclass:
ad = ((TypeClass *)tb)->sym;
break;
case Tpointer:
tb = ((TypePointer *)tb)->next->toBasetype();
if (tb->ty == Tstruct)
ad = ((TypeStruct *)tb)->sym;
break;
default:
break;
}
if (ad && ad->aggDelete)
return;
if (f->setGC())
{
e->error("cannot use 'delete' in @nogc %s '%s'",
f->kind(), f->toPrettyChars());
err = true;
return;
}
f->printGCUsage(e->loc, "'delete' requires GC");
}
void visit(IndexExp* e)
{
Type *t1b = e->e1->type->toBasetype();
if (t1b->ty == Taarray)
{
if (f->setGC())
{
e->error("indexing an associative array in @nogc %s '%s' may cause GC allocation",
f->kind(), f->toPrettyChars());
err = true;
return;
}
f->printGCUsage(e->loc, "indexing an associative array may cause GC allocation");
}
}
void visit(AssignExp *e)
{
if (e->e1->op == TOKarraylength)
{
if (f->setGC())
{
e->error("setting 'length' in @nogc %s '%s' may cause GC allocation",
f->kind(), f->toPrettyChars());
err = true;
return;
}
f->printGCUsage(e->loc, "setting 'length' may cause GC allocation");
}
}
void visit(CatAssignExp *e)
{
if (f->setGC())
{
e->error("cannot use operator ~= in @nogc %s '%s'",
f->kind(), f->toPrettyChars());
err = true;
return;
}
f->printGCUsage(e->loc, "operator ~= may cause GC allocation");
}
void visit(CatExp *e)
{
if (f->setGC())
{
e->error("cannot use operator ~ in @nogc %s '%s'",
f->kind(), f->toPrettyChars());
err = true;
return;
}
f->printGCUsage(e->loc, "operator ~ may cause GC allocation");
}
};
Expression *checkGC(Scope *sc, Expression *e)
{
FuncDeclaration *f = sc->func;
if (e && e->op != TOKerror &&
f && sc->intypeof != 1 && !(sc->flags & SCOPEctfe) &&
((f->type->ty == Tfunction && ((TypeFunction *)f->type)->isnogc) ||
(f->flags & FUNCFLAGnogcInprocess) ||
global.params.vgc))
{
NOGCVisitor gcv(f);
walkPostorder(e, &gcv);
if (gcv.err)
return new ErrorExp();
}
return e;
}
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