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ctfeexpr.c
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ctfeexpr.c
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// Compiler implementation of the D programming language
// Copyright (c) 1999-2012 by Digital Mars
// All Rights Reserved
// written by Walter Bright
// http://www.digitalmars.com
// License for redistribution is by either the Artistic License
// in artistic.txt, or the GNU General Public License in gnu.txt.
// See the included readme.txt for details.
#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include <string.h> // mem{cpy|set}()
#include "rmem.h"
#include "expression.h"
#include "declaration.h"
#include "aggregate.h"
// for AssocArray
#include "id.h"
#include "template.h"
#include "ctfe.h"
int RealEquals(real_t x1, real_t x2);
/************** ClassReferenceExp ********************************************/
ClassReferenceExp::ClassReferenceExp(Loc loc, StructLiteralExp *lit, Type *type)
: Expression(loc, TOKclassreference, sizeof(ClassReferenceExp))
{
assert(lit && lit->sd && lit->sd->isClassDeclaration());
this->value = lit;
this->type = type;
}
ClassDeclaration *ClassReferenceExp::originalClass()
{
return value->sd->isClassDeclaration();
}
VarDeclaration *ClassReferenceExp::getFieldAt(unsigned index)
{
ClassDeclaration *cd = originalClass();
unsigned fieldsSoFar = 0;
while (index - fieldsSoFar >= cd->fields.dim)
{
fieldsSoFar += cd->fields.dim;
cd = cd->baseClass;
}
return cd->fields[index - fieldsSoFar];
}
// Return index of the field, or -1 if not found
int ClassReferenceExp::getFieldIndex(Type *fieldtype, unsigned fieldoffset)
{
ClassDeclaration *cd = originalClass();
unsigned fieldsSoFar = 0;
for (size_t j = 0; j < value->elements->dim; j++)
{
while (j - fieldsSoFar >= cd->fields.dim)
{
fieldsSoFar += cd->fields.dim;
cd = cd->baseClass;
}
VarDeclaration *v2 = cd->fields[j - fieldsSoFar];
if (fieldoffset == v2->offset &&
fieldtype->size() == v2->type->size())
{
return (int)(value->elements->dim - fieldsSoFar - cd->fields.dim + (j-fieldsSoFar));
}
}
return -1;
}
// Return index of the field, or -1 if not found
// Same as getFieldIndex, but checks for a direct match with the VarDeclaration
int ClassReferenceExp::findFieldIndexByName(VarDeclaration *v)
{
ClassDeclaration *cd = originalClass();
size_t fieldsSoFar = 0;
for (size_t j = 0; j < value->elements->dim; j++)
{
while (j - fieldsSoFar >= cd->fields.dim)
{
fieldsSoFar += cd->fields.dim;
cd = cd->baseClass;
}
VarDeclaration *v2 = cd->fields[j - fieldsSoFar];
if (v == v2)
{
return (int)(value->elements->dim - fieldsSoFar - cd->fields.dim + (j-fieldsSoFar));
}
}
return -1;
}
/************** VoidInitExp ********************************************/
VoidInitExp::VoidInitExp(VarDeclaration *var, Type *type)
: Expression(var->loc, TOKvoid, sizeof(VoidInitExp))
{
this->var = var;
this->type = var->type;
}
char *VoidInitExp::toChars()
{
return (char *)"void";
}
// Return index of the field, or -1 if not found
// Same as getFieldIndex, but checks for a direct match with the VarDeclaration
int findFieldIndexByName(StructDeclaration *sd, VarDeclaration *v)
{
for (int i = 0; i < sd->fields.dim; ++i)
{
if (sd->fields[i] == v)
return i;
}
return -1;
}
/************** ThrownExceptionExp ********************************************/
ThrownExceptionExp::ThrownExceptionExp(Loc loc, ClassReferenceExp *victim) : Expression(loc, TOKthrownexception, sizeof(ThrownExceptionExp))
{
this->thrown = victim;
this->type = victim->type;
}
char *ThrownExceptionExp::toChars()
{
return (char *)"CTFE ThrownException";
}
// Generate an error message when this exception is not caught
void ThrownExceptionExp::generateUncaughtError()
{
Expression *e = (*thrown->value->elements)[0];
StringExp* se = e->toStringExp();
thrown->error("Uncaught CTFE exception %s(%s)", thrown->type->toChars(), se ? se->toChars() : e->toChars());
/* Also give the line where the throw statement was. We won't have it
* in the case where the ThrowStatement is generated internally
* (eg, in ScopeStatement)
*/
if (loc.filename && !loc.equals(thrown->loc))
errorSupplemental(loc, "thrown from here");
}
// True if 'e' is EXP_CANT_INTERPRET, or an exception
bool exceptionOrCantInterpret(Expression *e)
{
assert(EXP_CANT_INTERPRET && "EXP_CANT_INTERPRET must be distinct from "
"null, Expression::init not called?");
if (e == EXP_CANT_INTERPRET) return true;
if (!e || e == EXP_GOTO_INTERPRET || e == EXP_VOID_INTERPRET
|| e == EXP_BREAK_INTERPRET || e == EXP_CONTINUE_INTERPRET)
return false;
return e->op == TOKthrownexception;
}
/************** Aggregate literals (AA/string/array/struct) ******************/
// Given expr, which evaluates to an array/AA/string literal,
// return true if it needs to be copied
bool needToCopyLiteral(Expression *expr)
{
for (;;)
{
switch (expr->op)
{
case TOKarrayliteral:
return !((ArrayLiteralExp *)expr)->ownedByCtfe;
case TOKassocarrayliteral:
return !((AssocArrayLiteralExp *)expr)->ownedByCtfe;
case TOKstructliteral:
return !((StructLiteralExp *)expr)->ownedByCtfe;
case TOKstring:
case TOKthis:
case TOKvar:
return false;
case TOKassign:
return false;
case TOKindex:
case TOKdotvar:
case TOKslice:
case TOKcast:
expr = ((UnaExp *)expr)->e1;
continue;
case TOKcat:
return needToCopyLiteral(((BinExp *)expr)->e1) ||
needToCopyLiteral(((BinExp *)expr)->e2);
case TOKcatass:
expr = ((BinExp *)expr)->e2;
continue;
default:
return false;
}
}
}
Expressions *copyLiteralArray(Expressions *oldelems)
{
if (!oldelems)
return oldelems;
CtfeStatus::numArrayAllocs++;
Expressions *newelems = new Expressions();
newelems->setDim(oldelems->dim);
for (size_t i = 0; i < oldelems->dim; i++)
(*newelems)[i] = copyLiteral((*oldelems)[i]);
return newelems;
}
// Make a copy of the ArrayLiteral, AALiteral, String, or StructLiteral.
// This value will be used for in-place modification.
Expression *copyLiteral(Expression *e)
{
if (e->op == TOKstring) // syntaxCopy doesn't make a copy for StringExp!
{
StringExp *se = (StringExp *)e;
utf8_t *s = (utf8_t *)mem.calloc(se->len + 1, se->sz);
memcpy(s, se->string, se->len * se->sz);
StringExp *se2 = new StringExp(se->loc, s, se->len);
se2->committed = se->committed;
se2->postfix = se->postfix;
se2->type = se->type;
se2->sz = se->sz;
se2->ownedByCtfe = true;
return se2;
}
else if (e->op == TOKarrayliteral)
{
ArrayLiteralExp *ae = (ArrayLiteralExp *)e;
ArrayLiteralExp *r = new ArrayLiteralExp(e->loc,
copyLiteralArray(ae->elements));
r->type = e->type;
r->ownedByCtfe = true;
return r;
}
else if (e->op == TOKassocarrayliteral)
{
AssocArrayLiteralExp *aae = (AssocArrayLiteralExp *)e;
AssocArrayLiteralExp *r = new AssocArrayLiteralExp(e->loc,
copyLiteralArray(aae->keys), copyLiteralArray(aae->values));
r->type = e->type;
r->ownedByCtfe = true;
return r;
}
else if (e->op == TOKstructliteral)
{
/* syntaxCopy doesn't work for struct literals, because of a nasty special
* case: block assignment is permitted inside struct literals, eg,
* an int[4] array can be initialized with a single int.
*/
StructLiteralExp *se = (StructLiteralExp *)e;
Expressions *oldelems = se->elements;
Expressions * newelems = new Expressions();
newelems->setDim(oldelems->dim);
for (size_t i = 0; i < newelems->dim; i++)
{
Expression *m = (*oldelems)[i];
// We need the struct definition to detect block assignment
AggregateDeclaration *sd = se->sd;
VarDeclaration *v = sd->fields[i];
// If it is a void assignment, use the default initializer
if (!m)
m = voidInitLiteral(v->type, v);
if ((v->type->ty != m->type->ty) && v->type->ty == Tsarray)
{
// Block assignment from inside struct literals
TypeSArray *tsa = (TypeSArray *)v->type;
uinteger_t length = tsa->dim->toInteger();
m = createBlockDuplicatedArrayLiteral(e->loc, v->type, m, (size_t)length);
}
else if (v->type->ty != Tarray && v->type->ty!=Taarray) // NOTE: do not copy array references
m = copyLiteral(m);
(*newelems)[i] = m;
}
StructLiteralExp *r = new StructLiteralExp(e->loc, se->sd, newelems, se->stype);
r->type = e->type;
r->ownedByCtfe = true;
r->origin = ((StructLiteralExp*)e)->origin;
return r;
}
else if (e->op == TOKfunction || e->op == TOKdelegate
|| e->op == TOKsymoff || e->op == TOKnull
|| e->op == TOKvar || e->op == TOKdotvar
|| e->op == TOKint64 || e->op == TOKfloat64
|| e->op == TOKchar || e->op == TOKcomplex80
|| e->op == TOKvoid || e->op == TOKvector)
{
// Simple value types
Expression *r = e->copy(); // keep e1 for DelegateExp and DotVarExp
r->type = e->type;
return r;
}
else if (isPointer(e->type))
{
// For pointers, we only do a shallow copy.
Expression *r;
if (e->op == TOKaddress)
r = new AddrExp(e->loc, ((AddrExp *)e)->e1);
else if (e->op == TOKindex)
r = new IndexExp(e->loc, ((IndexExp *)e)->e1, ((IndexExp *)e)->e2);
else if (e->op == TOKdotvar)
{
r = new DotVarExp(e->loc, ((DotVarExp *)e)->e1,
((DotVarExp *)e)->var, ((DotVarExp *)e)->hasOverloads);
}
else
assert(0);
r->type = e->type;
return r;
}
else if (e->op == TOKslice)
{
// Array slices only do a shallow copy
Expression *r = new SliceExp(e->loc, ((SliceExp *)e)->e1,
((SliceExp *)e)->lwr, ((SliceExp *)e)->upr);
r->type = e->type;
return r;
}
else if (e->op == TOKclassreference)
return new ClassReferenceExp(e->loc, ((ClassReferenceExp *)e)->value, e->type);
else if (e->op == TOKerror)
return e;
else
{
e->error("Internal Compiler Error: CTFE literal %s", e->toChars());
assert(0);
return e;
}
}
/* Deal with type painting.
* Type painting is a major nuisance: we can't just set
* e->type = type, because that would change the original literal.
* But, we can't simply copy the literal either, because that would change
* the values of any pointers.
*/
Expression *paintTypeOntoLiteral(Type *type, Expression *lit)
{
if (lit->type->equals(type))
return lit;
// If it is a cast to inout, retain the original type of the referenced part.
if (type->hasWild() && type->hasPointers())
{
lit = lit->copy();
lit->type = type;
return lit;
}
Expression *e;
if (lit->op == TOKslice)
{
SliceExp *se = (SliceExp *)lit;
e = new SliceExp(lit->loc, se->e1, se->lwr, se->upr);
}
else if (lit->op == TOKindex)
{
IndexExp *ie = (IndexExp *)lit;
e = new IndexExp(lit->loc, ie->e1, ie->e2);
}
else if (lit->op == TOKarrayliteral)
{
e = new SliceExp(lit->loc, lit,
new IntegerExp(Loc(), 0, Type::tsize_t), ArrayLength(Type::tsize_t, lit));
}
else if (lit->op == TOKstring)
{
// For strings, we need to introduce another level of indirection
e = new SliceExp(lit->loc, lit,
new IntegerExp(Loc(), 0, Type::tsize_t), ArrayLength(Type::tsize_t, lit));
}
else if (lit->op == TOKassocarrayliteral)
{
AssocArrayLiteralExp *aae = (AssocArrayLiteralExp *)lit;
// TODO: we should be creating a reference to this AAExp, not
// just a ref to the keys and values.
bool wasOwned = aae->ownedByCtfe;
aae = new AssocArrayLiteralExp(lit->loc, aae->keys, aae->values);
aae->ownedByCtfe = wasOwned;
e = aae;
}
else
{
// Can't type paint from struct to struct*; this needs another
// level of indirection
if (lit->op == TOKstructliteral && isPointer(type) )
lit->error("CTFE internal error painting %s", type->toChars());
e = copyLiteral(lit);
}
e->type = type;
return e;
}
Expression *resolveSlice(Expression *e)
{
if ( ((SliceExp *)e)->e1->op == TOKnull)
return ((SliceExp *)e)->e1;
return Slice(e->type, ((SliceExp *)e)->e1,
((SliceExp *)e)->lwr, ((SliceExp *)e)->upr);
}
/* Determine the array length, without interpreting it.
* e must be an array literal, or a slice
* It's very wasteful to resolve the slice when we only
* need the length.
*/
uinteger_t resolveArrayLength(Expression *e)
{
if (e->op == TOKnull)
return 0;
if (e->op == TOKslice)
{ uinteger_t ilo = ((SliceExp *)e)->lwr->toInteger();
uinteger_t iup = ((SliceExp *)e)->upr->toInteger();
return iup - ilo;
}
if (e->op == TOKstring)
{ return ((StringExp *)e)->len;
}
if (e->op == TOKarrayliteral)
{ ArrayLiteralExp *ale = (ArrayLiteralExp *)e;
return ale->elements ? ale->elements->dim : 0;
}
if (e->op == TOKassocarrayliteral)
{ AssocArrayLiteralExp *ale = (AssocArrayLiteralExp *)e;
return ale->keys->dim;
}
assert(0);
return 0;
}
/******************************
* Helper for NewExp
* Create an array literal consisting of 'elem' duplicated 'dim' times.
*/
ArrayLiteralExp *createBlockDuplicatedArrayLiteral(Loc loc, Type *type,
Expression *elem, size_t dim)
{
Expressions *elements = new Expressions();
elements->setDim(dim);
if (type->ty == Tsarray && type->nextOf()->ty == Tsarray &&
elem->type->ty != Tsarray)
{
// If it is a multidimensional array literal, do it recursively
elem = createBlockDuplicatedArrayLiteral(loc, type->nextOf(), elem,
(size_t)((TypeSArray *)type->nextOf())->dim->toInteger());
}
bool mustCopy = needToCopyLiteral(elem);
for (size_t i = 0; i < dim; i++)
{ if (mustCopy)
elem = copyLiteral(elem);
(*elements)[i] = elem;
}
ArrayLiteralExp *ae = new ArrayLiteralExp(loc, elements);
ae->type = type;
ae->ownedByCtfe = true;
return ae;
}
/******************************
* Helper for NewExp
* Create a string literal consisting of 'value' duplicated 'dim' times.
*/
StringExp *createBlockDuplicatedStringLiteral(Loc loc, Type *type,
unsigned value, size_t dim, unsigned char sz)
{
utf8_t *s = (utf8_t *)mem.calloc(dim + 1, sz);
for (size_t elemi = 0; elemi < dim; ++elemi)
{
switch (sz)
{
case 1: s[elemi] = (utf8_t)value; break;
case 2: ((unsigned short *)s)[elemi] = (unsigned short)value; break;
case 4: ((unsigned *)s)[elemi] = value; break;
default: assert(0);
}
}
StringExp *se = new StringExp(loc, s, dim);
se->type = type;
se->sz = sz;
se->committed = true;
se->ownedByCtfe = true;
return se;
}
// Return true if t is an AA
bool isAssocArray(Type *t)
{
t = t->toBasetype();
if (t->ty == Taarray)
return true;
return false;
}
// Given a template AA type, extract the corresponding built-in AA type
TypeAArray *toBuiltinAAType(Type *t)
{
t = t->toBasetype();
if (t->ty == Taarray)
return (TypeAArray *)t;
assert(0);
return NULL;
}
/************** TypeInfo operations ************************************/
// Return true if type is TypeInfo_Class
bool isTypeInfo_Class(Type *type)
{
return type->ty == Tclass &&
(( Type::dtypeinfo == ((TypeClass*)type)->sym)
|| Type::dtypeinfo->isBaseOf(((TypeClass*)type)->sym, NULL));
}
/************** Pointer operations ************************************/
// Return true if t is a pointer (not a function pointer)
bool isPointer(Type *t)
{
Type * tb = t->toBasetype();
return tb->ty == Tpointer && tb->nextOf()->ty != Tfunction;
}
// For CTFE only. Returns true if 'e' is true or a non-null pointer.
int isTrueBool(Expression *e)
{
return e->isBool(true) || ((e->type->ty == Tpointer || e->type->ty == Tclass)
&& e->op != TOKnull);
}
/* Is it safe to convert from srcPointee* to destPointee* ?
* srcPointee is the genuine type (never void).
* destPointee may be void.
*/
bool isSafePointerCast(Type *srcPointee, Type *destPointee)
{
// It's safe to cast S** to D** if it's OK to cast S* to D*
while (srcPointee->ty == Tpointer && destPointee->ty == Tpointer)
{
srcPointee = srcPointee->nextOf();
destPointee = destPointee->nextOf();
}
// It's OK if both are the same (modulo const)
if (srcPointee->constConv(destPointee))
return true;
// It's OK if function pointers differ only in safe/pure/nothrow
if (srcPointee->ty == Tfunction && destPointee->ty == Tfunction)
return srcPointee->covariant(destPointee) == 1;
// it's OK to cast to void*
if (destPointee->ty == Tvoid)
return true;
// It's OK to cast from V[K] to void*
if (srcPointee->ty == Taarray && destPointee == Type::tvoidptr)
return true;
// It's OK if they are the same size (static array of) integers, eg:
// int* --> uint*
// int[5][] --> uint[5][]
return srcPointee->baseElemOf()->isintegral() &&
destPointee->baseElemOf()->isintegral() &&
srcPointee->size() == destPointee->size();
}
Expression *getAggregateFromPointer(Expression *e, dinteger_t *ofs)
{
*ofs = 0;
if (e->op == TOKaddress)
e = ((AddrExp *)e)->e1;
if (e->op == TOKsymoff)
*ofs = ((SymOffExp *)e)->offset;
if (e->op == TOKdotvar)
{
Expression *ex = ((DotVarExp *)e)->e1;
VarDeclaration *v = ((DotVarExp *)e)->var->isVarDeclaration();
assert(v);
StructLiteralExp *se = ex->op == TOKclassreference ? ((ClassReferenceExp *)ex)->value : (StructLiteralExp *)ex;
// We can't use getField, because it makes a copy
unsigned i;
if (ex->op == TOKclassreference)
i = ((ClassReferenceExp *)ex)->getFieldIndex(e->type, v->offset);
else
i = se->getFieldIndex(e->type, v->offset);
e = (*se->elements)[i];
}
if (e->op == TOKindex)
{
IndexExp *ie = (IndexExp *)e;
// Note that each AA element is part of its own memory block
if ((ie->e1->type->ty == Tarray || ie->e1->type->ty == Tsarray
|| ie->e1->op == TOKstring || ie->e1->op==TOKarrayliteral) &&
ie->e2->op == TOKint64)
{
*ofs = ie->e2->toInteger();
return ie->e1;
}
}
return e;
}
/** Return true if agg1 and agg2 are pointers to the same memory block
*/
bool pointToSameMemoryBlock(Expression *agg1, Expression *agg2)
{
// For integers cast to pointers, we regard them as non-comparable
// unless they are identical. (This may be overly strict).
if (agg1->op == TOKint64 && agg2->op == TOKint64
&& agg1->toInteger() == agg2->toInteger())
return true;
// Note that type painting can occur with VarExp, so we
// must compare the variables being pointed to.
return agg1 == agg2 ||
(agg1->op == TOKvar && agg2->op == TOKvar &&
((VarExp *)agg1)->var == ((VarExp *)agg2)->var) ||
(agg1->op == TOKsymoff && agg2->op == TOKsymoff &&
((SymOffExp *)agg1)->var == ((SymOffExp *)agg2)->var);
}
// return e1 - e2 as an integer, or error if not possible
Expression *pointerDifference(Loc loc, Type *type, Expression *e1, Expression *e2)
{
dinteger_t ofs1, ofs2;
Expression *agg1 = getAggregateFromPointer(e1, &ofs1);
Expression *agg2 = getAggregateFromPointer(e2, &ofs2);
if (agg1 == agg2)
{
Type *pointee = ((TypePointer *)agg1->type)->next;
dinteger_t sz = pointee->size();
return new IntegerExp(loc, (ofs1-ofs2)*sz, type);
}
else if (agg1->op == TOKstring && agg2->op == TOKstring)
{
if (((StringExp *)agg1)->string == ((StringExp *)agg2)->string)
{
Type *pointee = ((TypePointer *)agg1->type)->next;
dinteger_t sz = pointee->size();
return new IntegerExp(loc, (ofs1-ofs2)*sz, type);
}
}
else if (agg1->op == TOKsymoff && agg2->op == TOKsymoff &&
((SymOffExp *)agg1)->var == ((SymOffExp *)agg2)->var)
{
return new IntegerExp(loc, ofs1-ofs2, type);
}
error(loc, "%s - %s cannot be interpreted at compile time: cannot subtract "
"pointers to two different memory blocks",
e1->toChars(), e2->toChars());
return EXP_CANT_INTERPRET;
}
// Return eptr op e2, where eptr is a pointer, e2 is an integer,
// and op is TOKadd or TOKmin
Expression *pointerArithmetic(Loc loc, TOK op, Type *type,
Expression *eptr, Expression *e2)
{
if (eptr->type->nextOf()->ty == Tvoid)
{
error(loc, "cannot perform arithmetic on void* pointers at compile time");
return EXP_CANT_INTERPRET;
}
dinteger_t ofs1, ofs2;
if (eptr->op == TOKaddress)
eptr = ((AddrExp *)eptr)->e1;
Expression *agg1 = getAggregateFromPointer(eptr, &ofs1);
if (agg1->op == TOKsymoff)
{
if (((SymOffExp *)agg1)->var->type->ty != Tsarray)
{
error(loc, "cannot perform pointer arithmetic on arrays of unknown length at compile time");
return EXP_CANT_INTERPRET;
}
}
else if (agg1->op != TOKstring && agg1->op != TOKarrayliteral)
{
error(loc, "cannot perform pointer arithmetic on non-arrays at compile time");
return EXP_CANT_INTERPRET;
}
ofs2 = e2->toInteger();
Type *pointee = ((TypePointer *)agg1->type)->next;
sinteger_t indx = ofs1;
dinteger_t sz = pointee->size();
Expression *dollar;
if (agg1->op == TOKsymoff)
{
dollar = ((TypeSArray *)(((SymOffExp *)agg1)->var->type))->dim;
indx = ofs1/sz;
}
else
{
dollar = ArrayLength(Type::tsize_t, agg1);
assert(dollar != EXP_CANT_INTERPRET);
}
dinteger_t len = dollar->toInteger();
if (op == TOKadd || op == TOKaddass || op == TOKplusplus)
indx = indx + ofs2/sz;
else if (op == TOKmin || op == TOKminass || op == TOKminusminus)
indx -= ofs2/sz;
else
{
error(loc, "CTFE Internal compiler error: bad pointer operation");
return EXP_CANT_INTERPRET;
}
if (indx < 0 || indx > len)
{
error(loc, "cannot assign pointer to index %lld inside memory block [0..%lld]", indx, len);
return EXP_CANT_INTERPRET;
}
if (agg1->op == TOKsymoff)
{
SymOffExp *se = new SymOffExp(loc, ((SymOffExp *)agg1)->var, indx*sz);
se->type = type;
return se;
}
Expression *val = agg1;
if (val->op != TOKarrayliteral && val->op != TOKstring)
{
error(loc, "CTFE Internal compiler error: pointer arithmetic %s", val->toChars());
return EXP_CANT_INTERPRET;
}
IntegerExp *ofs = new IntegerExp(loc, indx, Type::tsize_t);
IndexExp *ie = new IndexExp(loc, val, ofs);
ie->type = type;
return ie;
}
// Return 1 if true, 0 if false
// -1 if comparison is illegal because they point to non-comparable memory blocks
int comparePointers(Loc loc, TOK op, Type *type, Expression *agg1, dinteger_t ofs1,
Expression *agg2, dinteger_t ofs2)
{
if ( pointToSameMemoryBlock(agg1, agg2) )
{
int n;
switch(op)
{
case TOKlt: n = (ofs1 < ofs2); break;
case TOKle: n = (ofs1 <= ofs2); break;
case TOKgt: n = (ofs1 > ofs2); break;
case TOKge: n = (ofs1 >= ofs2); break;
case TOKidentity:
case TOKequal: n = (ofs1 == ofs2); break;
case TOKnotidentity:
case TOKnotequal: n = (ofs1 != ofs2); break;
default:
assert(0);
}
return n;
}
bool null1 = ( agg1->op == TOKnull );
bool null2 = ( agg2->op == TOKnull );
int cmp;
if (null1 || null2)
{
switch (op)
{
case TOKlt: cmp = null1 && !null2; break;
case TOKgt: cmp = !null1 && null2; break;
case TOKle: cmp = null1; break;
case TOKge: cmp = null2; break;
case TOKidentity:
case TOKequal:
case TOKnotidentity: // 'cmp' gets inverted below
case TOKnotequal:
cmp = (null1 == null2);
break;
default:
assert(0);
}
}
else
{
switch(op)
{
case TOKidentity:
case TOKequal:
case TOKnotidentity: // 'cmp' gets inverted below
case TOKnotequal:
cmp = 0;
break;
default:
return -1; // memory blocks are different
}
}
if (op == TOKnotidentity || op == TOKnotequal)
cmp ^= 1;
return cmp;
}
union UnionFloatInt
{
float f;
d_int32 x;
};
union UnionDoubleLong
{
double f;
d_int64 x;
};
// True if conversion from type 'from' to 'to' involves a reinterpret_cast
// floating point -> integer or integer -> floating point
bool isFloatIntPaint(Type *to, Type *from)
{
return (from->size() == to->size()) &&
( (from->isintegral() && to->isfloating())
|| (from->isfloating() && to->isintegral()) );
}
// Reinterpret float/int value 'fromVal' as a float/integer of type 'to'.
Expression *paintFloatInt(Expression *fromVal, Type *to)
{
if (exceptionOrCantInterpret(fromVal))
return fromVal;
if (to->size() == 4)
{
UnionFloatInt u;
if (to->isintegral())
{
u.f = fromVal->toReal();
return new IntegerExp(fromVal->loc, (dinteger_t)ldouble(u.x), to);
}
else
{
u.x = (d_int32)fromVal->toInteger();
return new RealExp(fromVal->loc, ldouble(u.f), to);
}
}
else if (to->size() == 8)
{
UnionDoubleLong v;
if (to->isintegral())
{
v.f = fromVal->toReal();
return new IntegerExp(fromVal->loc, v.x, to);
}
else
{
v.x = fromVal->toInteger();
return new RealExp(fromVal->loc, ldouble(v.f), to);
}
}
assert(0);
return NULL; // avoid warning
}
/***********************************************
Primitive integer operations
***********************************************/
/** e = OP e
*/
void intUnary(TOK op, IntegerExp *e)
{
switch (op)
{
case TOKneg:
e->value = -e->value;
break;
case TOKtilde:
e->value = ~e->value;
break;
default:
assert(0);
break;
}
}
/** dest = e1 OP e2;
*/
void intBinary(TOK op, IntegerExp *dest, Type *type, IntegerExp *e1, IntegerExp *e2)
{
dinteger_t result;
switch (op)
{
case TOKand:
result = e1->value & e2->value;
break;
case TOKor:
result = e1->value | e2->value;
break;
case TOKxor:
result = e1->value ^ e2->value;
break;
case TOKadd:
result = e1->value + e2->value;
break;
case TOKmin:
result = e1->value - e2->value;
break;
case TOKmul:
result = e1->value * e2->value;
break;
case TOKdiv:
{ sinteger_t n1 = e1->value;
sinteger_t n2 = e2->value;
if (n2 == 0)
{ e2->error("divide by 0");
result = 1;
}
else if (e1->type->isunsigned() || e2->type->isunsigned())
result = ((d_uns64) n1) / ((d_uns64) n2);
else
result = n1 / n2;
}
break;
case TOKmod:
{ sinteger_t n1 = e1->value;
sinteger_t n2 = e2->value;
if (n2 == 0)
{ e2->error("divide by 0");
n2 = 1;
}
if (n2 == -1 && !type->isunsigned())
{ // Check for int.min % -1
if (n1 == 0xFFFFFFFF80000000ULL && type->toBasetype()->ty != Tint64)
{
e2->error("integer overflow: int.min % -1");
n2 = 1;
}
else if (n1 == 0x8000000000000000LL) // long.min % -1
{
e2->error("integer overflow: long.min % -1");
n2 = 1;
}
}
if (e1->type->isunsigned() || e2->type->isunsigned())
result = ((d_uns64) n1) % ((d_uns64) n2);
else
result = n1 % n2;
}
break;
case TOKpow:
{ dinteger_t n = e2->value;
if (!e2->type->isunsigned() && (sinteger_t)n < 0)
{
e2->error("integer ^^ -integer: total loss of precision");
n = 1;
}
uinteger_t r = e1->value;
result = 1;
while (n != 0)
{
if (n & 1)
result = result * r;
n >>= 1;
r = r * r;
}
}
break;
case TOKshl:
result = e1->value << e2->value;
break;
case TOKshr:
{ dinteger_t value = e1->value;
dinteger_t dcount = e2->value;
assert(dcount <= 0xFFFFFFFF);
unsigned count = (unsigned)dcount;
switch (e1->type->toBasetype()->ty)
{
case Tint8:
result = (d_int8)(value) >> count;
break;
case Tuns8:
case Tchar:
result = (d_uns8)(value) >> count;
break;
case Tint16:
result = (d_int16)(value) >> count;
break;
case Tuns16:
case Twchar:
result = (d_uns16)(value) >> count;
break;
case Tint32:
result = (d_int32)(value) >> count;