本文整理汇总了C++中Expression::copy方法的典型用法代码示例。如果您正苦于以下问题：C++ Expression::copy方法的具体用法？C++ Expression::copy怎么用？C++ Expression::copy使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类Expression的用法示例。
在下文中一共展示了Expression::copy方法的2个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C++代码示例。
示例1: if
Expression *expandVar(int result, VarDeclaration *v)
{
//printf("expandVar(result = %d, v = %p, %s)\n", result, v, v ? v->toChars() : "null");
Expression *e = NULL;
if (!v)
return e;
if (!v->originalType && v->scope) // semantic() not yet run
v->semantic (v->scope);
if (v->isConst() || v->isImmutable() || v->storage_class & STCmanifest)
{
if (!v->type)
{
//error("ICE");
return e;
}
Type *tb = v->type->toBasetype();
if (result & WANTinterpret ||
v->storage_class & STCmanifest ||
v->type->toBasetype()->isscalar() ||
((result & WANTexpand) && (tb->ty != Tsarray && tb->ty != Tstruct))
)
{
if (v->init)
{
if (v->inuse)
{ if (v->storage_class & STCmanifest)
v->error("recursive initialization of constant");
goto L1;
}
Expression *ei = v->init->toExpression();
if (!ei)
{ if (v->storage_class & STCmanifest)
v->error("enum cannot be initialized with %s", v->init->toChars());
goto L1;
}
if (ei->op == TOKconstruct || ei->op == TOKblit)
{ AssignExp *ae = (AssignExp *)ei;
ei = ae->e2;
if (result & WANTinterpret)
{
v->inuse++;
ei = ei->optimize(result);
v->inuse--;
}
else if (ei->isConst() != 1 && ei->op != TOKstring)
goto L1;
if (ei->type == v->type)
{ // const variable initialized with const expression
}
else if (ei->implicitConvTo(v->type) >= MATCHconst)
{ // const var initialized with non-const expression
ei = ei->implicitCastTo(0, v->type);
ei = ei->semantic(0);
}
else
goto L1;
}
if (v->scope)
{
v->inuse++;
e = ei->syntaxCopy();
e = e->semantic(v->scope);
e = e->implicitCastTo(v->scope, v->type);
// enabling this line causes test22 in test suite to fail
//ei->type = e->type;
v->scope = NULL;
v->inuse--;
}
else if (!ei->type)
{
goto L1;
}
else
// Should remove the copy() operation by
// making all mods to expressions copy-on-write
e = ei->copy();
}
else
{
#if 1
goto L1;
#else
// BUG: what if const is initialized in constructor?
e = v->type->defaultInit();
e->loc = e1->loc;
#endif
}
if (e->type != v->type)
{
e = e->castTo(NULL, v->type);
}
v->inuse++;
e = e->optimize(result);
v->inuse--;
}
}
L1:
//.........这里部分代码省略.........
示例2: AddrExp
Expression *AddrExp::optimize(int result)
{ Expression *e;
//printf("AddrExp::optimize(result = %d) %s\n", result, toChars());
/* Rewrite &(a,b) as (a,&b)
*/
if (e1->op == TOKcomma)
{ CommaExp *ce = (CommaExp *)e1;
AddrExp *ae = new AddrExp(loc, ce->e2);
ae->type = type;
e = new CommaExp(ce->loc, ce->e1, ae);
e->type = type;
return e->optimize(result);
}
if (e1->op == TOKvar)
{ VarExp *ve = (VarExp *)e1;
if (ve->var->storage_class & STCmanifest)
e1 = e1->optimize(result);
}
else
e1 = e1->optimize(result);
// Convert &*ex to ex
if (e1->op == TOKstar)
{ Expression *ex;
ex = ((PtrExp *)e1)->e1;
if (type->equals(ex->type))
e = ex;
else
{
e = ex->copy();
e->type = type;
}
return e;
}
if (e1->op == TOKvar)
{ VarExp *ve = (VarExp *)e1;
if (!ve->var->isOut() && !ve->var->isRef() &&
!ve->var->isImportedSymbol())
{
SymOffExp *se = new SymOffExp(loc, ve->var, 0, ve->hasOverloads);
se->type = type;
return se;
}
}
if (e1->op == TOKindex)
{ // Convert &array[n] to &array+n
IndexExp *ae = (IndexExp *)e1;
if (ae->e2->op == TOKint64 && ae->e1->op == TOKvar)
{
dinteger_t index = ae->e2->toInteger();
VarExp *ve = (VarExp *)ae->e1;
if (ve->type->ty == Tsarray
&& !ve->var->isImportedSymbol())
{
TypeSArray *ts = (TypeSArray *)ve->type;
dinteger_t dim = ts->dim->toInteger();
if (index < 0 || index >= dim)
error("array index %jd is out of bounds [0..%jd]", index, dim);
e = new SymOffExp(loc, ve->var, index * ts->nextOf()->size());
e->type = type;
return e;
}
}
}
return this;
}