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inline.c
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// Copyright (c) 1999-2011 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.
// Routines to perform function inlining
#define LOG 0
#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include "id.h"
#include "init.h"
#include "declaration.h"
#include "aggregate.h"
#include "expression.h"
#include "statement.h"
#include "mtype.h"
#include "scope.h"
/* ========== Compute cost of inlining =============== */
/* Walk trees to determine if inlining can be done, and if so,
* if it is too complex to be worth inlining or not.
*/
struct InlineCostState
{
int nested;
int hasthis;
int hdrscan; // !=0 if inline scan for 'header' content
FuncDeclaration *fd;
};
const int COST_MAX = 250;
int Statement::inlineCost(InlineCostState *ics)
{
return COST_MAX; // default is we can't inline it
}
int ExpStatement::inlineCost(InlineCostState *ics)
{
return exp ? exp->inlineCost(ics) : 0;
}
int CompoundStatement::inlineCost(InlineCostState *ics)
{ int cost = 0;
for (size_t i = 0; i < statements->dim; i++)
{ Statement *s = statements->tdata()[i];
if (s)
{
cost += s->inlineCost(ics);
if (cost >= COST_MAX)
break;
}
}
return cost;
}
int UnrolledLoopStatement::inlineCost(InlineCostState *ics)
{ int cost = 0;
for (size_t i = 0; i < statements->dim; i++)
{ Statement *s = statements->tdata()[i];
if (s)
{
cost += s->inlineCost(ics);
if (cost >= COST_MAX)
break;
}
}
return cost;
}
int IfStatement::inlineCost(InlineCostState *ics)
{
int cost;
/* Can't declare variables inside ?: expressions, so
* we cannot inline if a variable is declared.
*/
if (arg)
return COST_MAX;
cost = condition->inlineCost(ics);
/* Specifically allow:
* if (condition)
* return exp1;
* else
* return exp2;
* Otherwise, we can't handle return statements nested in if's.
*/
if (elsebody && ifbody &&
ifbody->isReturnStatement() &&
elsebody->isReturnStatement())
{
cost += ifbody->inlineCost(ics);
cost += elsebody->inlineCost(ics);
//printf("cost = %d\n", cost);
}
else
{
ics->nested += 1;
if (ifbody)
cost += ifbody->inlineCost(ics);
if (elsebody)
cost += elsebody->inlineCost(ics);
ics->nested -= 1;
}
return cost;
}
int ReturnStatement::inlineCost(InlineCostState *ics)
{
// Can't handle return statements nested in if's
if (ics->nested)
return COST_MAX;
return exp ? exp->inlineCost(ics) : 0;
}
int ImportStatement::inlineCost(InlineCostState *ics)
{
return 0;
}
/* -------------------------- */
int arrayInlineCost(InlineCostState *ics, Expressions *arguments)
{ int cost = 0;
if (arguments)
{
for (int i = 0; i < arguments->dim; i++)
{ Expression *e = arguments->tdata()[i];
if (e)
cost += e->inlineCost(ics);
}
}
return cost;
}
int Expression::inlineCost(InlineCostState *ics)
{
return 1;
}
int VarExp::inlineCost(InlineCostState *ics)
{
//printf("VarExp::inlineCost() %s\n", toChars());
return 1;
}
int ThisExp::inlineCost(InlineCostState *ics)
{
//printf("ThisExp::inlineCost() %s\n", toChars());
FuncDeclaration *fd = ics->fd;
if (!fd)
return COST_MAX;
if (!ics->hdrscan)
if (fd->isNested() || !ics->hasthis)
return COST_MAX;
return 1;
}
int SuperExp::inlineCost(InlineCostState *ics)
{
FuncDeclaration *fd = ics->fd;
if (!fd)
return COST_MAX;
if (!ics->hdrscan)
if (fd->isNested() || !ics->hasthis)
return COST_MAX;
return 1;
}
int TupleExp::inlineCost(InlineCostState *ics)
{
return 1 + arrayInlineCost(ics, exps);
}
int ArrayLiteralExp::inlineCost(InlineCostState *ics)
{
return 1 + arrayInlineCost(ics, elements);
}
int AssocArrayLiteralExp::inlineCost(InlineCostState *ics)
{
return 1 + arrayInlineCost(ics, keys) + arrayInlineCost(ics, values);
}
int StructLiteralExp::inlineCost(InlineCostState *ics)
{
return 1 + arrayInlineCost(ics, elements);
}
int FuncExp::inlineCost(InlineCostState *ics)
{
//printf("FuncExp::inlineCost()\n");
// Right now, this makes the function be output to the .obj file twice.
return COST_MAX;
}
int DelegateExp::inlineCost(InlineCostState *ics)
{
return COST_MAX;
}
int DeclarationExp::inlineCost(InlineCostState *ics)
{ int cost = 0;
VarDeclaration *vd;
//printf("DeclarationExp::inlineCost()\n");
vd = declaration->isVarDeclaration();
if (vd)
{
TupleDeclaration *td = vd->toAlias()->isTupleDeclaration();
if (td)
{
#if 1
return COST_MAX; // finish DeclarationExp::doInline
#else
for (size_t i = 0; i < td->objects->dim; i++)
{ Object *o = td->objects->tdata()[i];
if (o->dyncast() != DYNCAST_EXPRESSION)
return COST_MAX;
Expression *eo = (Expression *)o;
if (eo->op != TOKdsymbol)
return COST_MAX;
}
return td->objects->dim;
#endif
}
if (!ics->hdrscan && vd->isDataseg())
return COST_MAX;
cost += 1;
if (vd->edtor) // if destructor required
return COST_MAX; // needs work to make this work
// Scan initializer (vd->init)
if (vd->init)
{
ExpInitializer *ie = vd->init->isExpInitializer();
if (ie)
{
cost += ie->exp->inlineCost(ics);
}
}
}
// These can contain functions, which when copied, get output twice.
if (declaration->isStructDeclaration() ||
declaration->isClassDeclaration() ||
declaration->isFuncDeclaration() ||
declaration->isTypedefDeclaration() ||
declaration->isAttribDeclaration() ||
declaration->isTemplateMixin())
return COST_MAX;
//printf("DeclarationExp::inlineCost('%s')\n", toChars());
return cost;
}
int UnaExp::inlineCost(InlineCostState *ics)
{
return 1 + e1->inlineCost(ics);
}
int AssertExp::inlineCost(InlineCostState *ics)
{
return 1 + e1->inlineCost(ics) + (msg ? msg->inlineCost(ics) : 0);
}
int BinExp::inlineCost(InlineCostState *ics)
{
return 1 + e1->inlineCost(ics) + e2->inlineCost(ics);
}
int CallExp::inlineCost(InlineCostState *ics)
{
// Bugzilla 3500: super.func() calls must be devirtualized, and the inliner
// can't handle that at present.
if (e1->op == TOKdotvar && ((DotVarExp *)e1)->e1->op == TOKsuper)
return COST_MAX;
return 1 + e1->inlineCost(ics) + arrayInlineCost(ics, arguments);
}
int SliceExp::inlineCost(InlineCostState *ics)
{ int cost;
cost = 1 + e1->inlineCost(ics);
if (lwr)
cost += lwr->inlineCost(ics);
if (upr)
cost += upr->inlineCost(ics);
return cost;
}
int ArrayExp::inlineCost(InlineCostState *ics)
{
return 1 + e1->inlineCost(ics) + arrayInlineCost(ics, arguments);
}
int CondExp::inlineCost(InlineCostState *ics)
{
return 1 +
e1->inlineCost(ics) +
e2->inlineCost(ics) +
econd->inlineCost(ics);
}
/* ======================== Perform the inlining ============================== */
/* Inlining is done by:
* o Converting to an Expression
* o Copying the trees of the function to be inlined
* o Renaming the variables
*/
struct InlineDoState
{
VarDeclaration *vthis;
Dsymbols from; // old Dsymbols
Dsymbols to; // parallel array of new Dsymbols
Dsymbol *parent; // new parent
};
Expression *Statement::doInline(InlineDoState *ids)
{
assert(0);
return NULL; // default is we can't inline it
}
Expression *ExpStatement::doInline(InlineDoState *ids)
{
#if LOG
if (exp) printf("ExpStatement::doInline() '%s'\n", exp->toChars());
#endif
return exp ? exp->doInline(ids) : NULL;
}
Expression *CompoundStatement::doInline(InlineDoState *ids)
{
Expression *e = NULL;
//printf("CompoundStatement::doInline() %d\n", statements->dim);
for (size_t i = 0; i < statements->dim; i++)
{ Statement *s = statements->tdata()[i];
if (s)
{
Expression *e2 = s->doInline(ids);
e = Expression::combine(e, e2);
if (s->isReturnStatement())
break;
/* Check for:
* if (condition)
* return exp1;
* else
* return exp2;
*/
IfStatement *ifs = s->isIfStatement();
if (ifs && ifs->elsebody && ifs->ifbody &&
ifs->ifbody->isReturnStatement() &&
ifs->elsebody->isReturnStatement()
)
break;
}
}
return e;
}
Expression *UnrolledLoopStatement::doInline(InlineDoState *ids)
{
Expression *e = NULL;
//printf("UnrolledLoopStatement::doInline() %d\n", statements->dim);
for (size_t i = 0; i < statements->dim; i++)
{ Statement *s = statements->tdata()[i];
if (s)
{
Expression *e2 = s->doInline(ids);
e = Expression::combine(e, e2);
if (s->isReturnStatement())
break;
}
}
return e;
}
Expression *IfStatement::doInline(InlineDoState *ids)
{
Expression *econd;
Expression *e1;
Expression *e2;
Expression *e;
assert(!arg);
econd = condition->doInline(ids);
assert(econd);
if (ifbody)
e1 = ifbody->doInline(ids);
else
e1 = NULL;
if (elsebody)
e2 = elsebody->doInline(ids);
else
e2 = NULL;
if (e1 && e2)
{
e = new CondExp(econd->loc, econd, e1, e2);
e->type = e1->type;
}
else if (e1)
{
e = new AndAndExp(econd->loc, econd, e1);
e->type = Type::tvoid;
}
else if (e2)
{
e = new OrOrExp(econd->loc, econd, e2);
e->type = Type::tvoid;
}
else
{
e = econd;
}
return e;
}
Expression *ReturnStatement::doInline(InlineDoState *ids)
{
//printf("ReturnStatement::doInline() '%s'\n", exp ? exp->toChars() : "");
return exp ? exp->doInline(ids) : 0;
}
Expression *ImportStatement::doInline(InlineDoState *ids)
{
return NULL;
}
/* --------------------------------------------------------------- */
/******************************
* Perform doInline() on an array of Expressions.
*/
Expressions *arrayExpressiondoInline(Expressions *a, InlineDoState *ids)
{ Expressions *newa = NULL;
if (a)
{
newa = new Expressions();
newa->setDim(a->dim);
for (int i = 0; i < a->dim; i++)
{ Expression *e = a->tdata()[i];
if (e)
e = e->doInline(ids);
newa->tdata()[i] = e;
}
}
return newa;
}
Expression *Expression::doInline(InlineDoState *ids)
{
//printf("Expression::doInline(%s): %s\n", Token::toChars(op), toChars());
return copy();
}
Expression *SymOffExp::doInline(InlineDoState *ids)
{
int i;
//printf("SymOffExp::doInline(%s)\n", toChars());
for (i = 0; i < ids->from.dim; i++)
{
if (var == ids->from.tdata()[i])
{
SymOffExp *se = (SymOffExp *)copy();
se->var = (Declaration *)ids->to.tdata()[i];
return se;
}
}
return this;
}
Expression *VarExp::doInline(InlineDoState *ids)
{
int i;
//printf("VarExp::doInline(%s)\n", toChars());
for (i = 0; i < ids->from.dim; i++)
{
if (var == ids->from.tdata()[i])
{
VarExp *ve = (VarExp *)copy();
ve->var = (Declaration *)ids->to.tdata()[i];
return ve;
}
}
return this;
}
Expression *ThisExp::doInline(InlineDoState *ids)
{
//if (!ids->vthis)
//error("no 'this' when inlining %s", ids->parent->toChars());
if (!ids->vthis)
{
return this;
}
VarExp *ve = new VarExp(loc, ids->vthis);
ve->type = type;
return ve;
}
Expression *SuperExp::doInline(InlineDoState *ids)
{
assert(ids->vthis);
VarExp *ve = new VarExp(loc, ids->vthis);
ve->type = type;
return ve;
}
Expression *DeclarationExp::doInline(InlineDoState *ids)
{ DeclarationExp *de = (DeclarationExp *)copy();
VarDeclaration *vd;
//printf("DeclarationExp::doInline(%s)\n", toChars());
vd = declaration->isVarDeclaration();
if (vd)
{
#if 0
// Need to figure this out before inlining can work for tuples
TupleDeclaration *td = vd->toAlias()->isTupleDeclaration();
if (td)
{
for (size_t i = 0; i < td->objects->dim; i++)
{ DsymbolExp *se = td->objects->tdata()[i];
assert(se->op == TOKdsymbol);
se->s;
}
return st->objects->dim;
}
#endif
if (vd->isStatic())
;
else
{
VarDeclaration *vto;
vto = new VarDeclaration(vd->loc, vd->type, vd->ident, vd->init);
*vto = *vd;
vto->parent = ids->parent;
vto->csym = NULL;
vto->isym = NULL;
ids->from.push(vd);
ids->to.push(vto);
if (vd->init)
{
if (vd->init->isVoidInitializer())
{
vto->init = new VoidInitializer(vd->init->loc);
}
else
{
Expression *e = vd->init->toExpression();
assert(e);
vto->init = new ExpInitializer(e->loc, e->doInline(ids));
}
}
de->declaration = (Dsymbol *) (void *)vto;
}
}
/* This needs work, like DeclarationExp::toElem(), if we are
* to handle TemplateMixin's. For now, we just don't inline them.
*/
return de;
}
Expression *NewExp::doInline(InlineDoState *ids)
{
//printf("NewExp::doInline(): %s\n", toChars());
NewExp *ne = (NewExp *)copy();
if (thisexp)
ne->thisexp = thisexp->doInline(ids);
ne->newargs = arrayExpressiondoInline(ne->newargs, ids);
ne->arguments = arrayExpressiondoInline(ne->arguments, ids);
return ne;
}
Expression *UnaExp::doInline(InlineDoState *ids)
{
UnaExp *ue = (UnaExp *)copy();
ue->e1 = e1->doInline(ids);
return ue;
}
Expression *AssertExp::doInline(InlineDoState *ids)
{
AssertExp *ae = (AssertExp *)copy();
ae->e1 = e1->doInline(ids);
if (msg)
ae->msg = msg->doInline(ids);
return ae;
}
Expression *BinExp::doInline(InlineDoState *ids)
{
BinExp *be = (BinExp *)copy();
be->e1 = e1->doInline(ids);
be->e2 = e2->doInline(ids);
return be;
}
Expression *CallExp::doInline(InlineDoState *ids)
{
CallExp *ce;
ce = (CallExp *)copy();
ce->e1 = e1->doInline(ids);
ce->arguments = arrayExpressiondoInline(arguments, ids);
return ce;
}
Expression *IndexExp::doInline(InlineDoState *ids)
{
IndexExp *are = (IndexExp *)copy();
are->e1 = e1->doInline(ids);
if (lengthVar)
{ //printf("lengthVar\n");
VarDeclaration *vd = lengthVar;
ExpInitializer *ie;
ExpInitializer *ieto;
VarDeclaration *vto;
vto = new VarDeclaration(vd->loc, vd->type, vd->ident, vd->init);
*vto = *vd;
vto->parent = ids->parent;
vto->csym = NULL;
vto->isym = NULL;
ids->from.push(vd);
ids->to.push(vto);
if (vd->init && !vd->init->isVoidInitializer())
{
ie = vd->init->isExpInitializer();
assert(ie);
ieto = new ExpInitializer(ie->loc, ie->exp->doInline(ids));
vto->init = ieto;
}
are->lengthVar = (VarDeclaration *) (void *)vto;
}
are->e2 = e2->doInline(ids);
return are;
}
Expression *SliceExp::doInline(InlineDoState *ids)
{
SliceExp *are = (SliceExp *)copy();
are->e1 = e1->doInline(ids);
if (lengthVar)
{ //printf("lengthVar\n");
VarDeclaration *vd = lengthVar;
ExpInitializer *ie;
ExpInitializer *ieto;
VarDeclaration *vto;
vto = new VarDeclaration(vd->loc, vd->type, vd->ident, vd->init);
*vto = *vd;
vto->parent = ids->parent;
vto->csym = NULL;
vto->isym = NULL;
ids->from.push(vd);
ids->to.push(vto);
if (vd->init && !vd->init->isVoidInitializer())
{
ie = vd->init->isExpInitializer();
assert(ie);
ieto = new ExpInitializer(ie->loc, ie->exp->doInline(ids));
vto->init = ieto;
}
are->lengthVar = (VarDeclaration *) (void *)vto;
}
if (lwr)
are->lwr = lwr->doInline(ids);
if (upr)
are->upr = upr->doInline(ids);
return are;
}
Expression *TupleExp::doInline(InlineDoState *ids)
{
TupleExp *ce;
ce = (TupleExp *)copy();
ce->exps = arrayExpressiondoInline(exps, ids);
return ce;
}
Expression *ArrayLiteralExp::doInline(InlineDoState *ids)
{
ArrayLiteralExp *ce;
ce = (ArrayLiteralExp *)copy();
ce->elements = arrayExpressiondoInline(elements, ids);
return ce;
}
Expression *AssocArrayLiteralExp::doInline(InlineDoState *ids)
{
AssocArrayLiteralExp *ce;
ce = (AssocArrayLiteralExp *)copy();
ce->keys = arrayExpressiondoInline(keys, ids);
ce->values = arrayExpressiondoInline(values, ids);
return ce;
}
Expression *StructLiteralExp::doInline(InlineDoState *ids)
{
StructLiteralExp *ce;
ce = (StructLiteralExp *)copy();
ce->elements = arrayExpressiondoInline(elements, ids);
return ce;
}
Expression *ArrayExp::doInline(InlineDoState *ids)
{
ArrayExp *ce;
ce = (ArrayExp *)copy();
ce->e1 = e1->doInline(ids);
ce->arguments = arrayExpressiondoInline(arguments, ids);
return ce;
}
Expression *CondExp::doInline(InlineDoState *ids)
{
CondExp *ce = (CondExp *)copy();
ce->econd = econd->doInline(ids);
ce->e1 = e1->doInline(ids);
ce->e2 = e2->doInline(ids);
return ce;
}
/* ========== Walk the parse trees, and inline expand functions ============= */
/* Walk the trees, looking for functions to inline.
* Inline any that can be.
*/
struct InlineScanState
{
FuncDeclaration *fd; // function being scanned
};
Statement *Statement::inlineScan(InlineScanState *iss)
{
return this;
}
Statement *ExpStatement::inlineScan(InlineScanState *iss)
{
#if LOG
printf("ExpStatement::inlineScan(%s)\n", toChars());
#endif
if (exp)
exp = exp->inlineScan(iss);
return this;
}
Statement *CompoundStatement::inlineScan(InlineScanState *iss)
{
for (size_t i = 0; i < statements->dim; i++)
{ Statement *s = statements->tdata()[i];
if (s)
statements->tdata()[i] = s->inlineScan(iss);
}
return this;
}
Statement *UnrolledLoopStatement::inlineScan(InlineScanState *iss)
{
for (size_t i = 0; i < statements->dim; i++)
{ Statement *s = statements->tdata()[i];
if (s)
statements->tdata()[i] = s->inlineScan(iss);
}
return this;
}
Statement *ScopeStatement::inlineScan(InlineScanState *iss)
{
if (statement)
statement = statement->inlineScan(iss);
return this;
}
Statement *WhileStatement::inlineScan(InlineScanState *iss)
{
condition = condition->inlineScan(iss);
body = body ? body->inlineScan(iss) : NULL;
return this;
}
Statement *DoStatement::inlineScan(InlineScanState *iss)
{
body = body ? body->inlineScan(iss) : NULL;
condition = condition->inlineScan(iss);
return this;
}
Statement *ForStatement::inlineScan(InlineScanState *iss)
{
if (init)
init = init->inlineScan(iss);
if (condition)
condition = condition->inlineScan(iss);
if (increment)
increment = increment->inlineScan(iss);
if (body)
body = body->inlineScan(iss);
return this;
}
Statement *ForeachStatement::inlineScan(InlineScanState *iss)
{
aggr = aggr->inlineScan(iss);
if (body)
body = body->inlineScan(iss);
return this;
}
#if DMDV2
Statement *ForeachRangeStatement::inlineScan(InlineScanState *iss)
{
lwr = lwr->inlineScan(iss);
upr = upr->inlineScan(iss);
if (body)
body = body->inlineScan(iss);
return this;
}
#endif
Statement *IfStatement::inlineScan(InlineScanState *iss)
{
condition = condition->inlineScan(iss);
if (ifbody)
ifbody = ifbody->inlineScan(iss);
if (elsebody)
elsebody = elsebody->inlineScan(iss);
return this;
}
Statement *SwitchStatement::inlineScan(InlineScanState *iss)
{
//printf("SwitchStatement::inlineScan()\n");
condition = condition->inlineScan(iss);
body = body ? body->inlineScan(iss) : NULL;
if (sdefault)
sdefault = (DefaultStatement *)sdefault->inlineScan(iss);
if (cases)
{
for (int i = 0; i < cases->dim; i++)
{ CaseStatement *s;
s = cases->tdata()[i];
cases->tdata()[i] = (CaseStatement *)s->inlineScan(iss);
}
}
return this;
}
Statement *CaseStatement::inlineScan(InlineScanState *iss)
{
//printf("CaseStatement::inlineScan()\n");
exp = exp->inlineScan(iss);
if (statement)
statement = statement->inlineScan(iss);
return this;
}
Statement *DefaultStatement::inlineScan(InlineScanState *iss)
{
if (statement)
statement = statement->inlineScan(iss);
return this;
}
Statement *ReturnStatement::inlineScan(InlineScanState *iss)
{
//printf("ReturnStatement::inlineScan()\n");
if (exp)
{
exp = exp->inlineScan(iss);
}
return this;
}
Statement *SynchronizedStatement::inlineScan(InlineScanState *iss)
{
if (exp)
exp = exp->inlineScan(iss);
if (body)
body = body->inlineScan(iss);
return this;
}
Statement *WithStatement::inlineScan(InlineScanState *iss)
{
if (exp)
exp = exp->inlineScan(iss);
if (body)
body = body->inlineScan(iss);
return this;
}
Statement *TryCatchStatement::inlineScan(InlineScanState *iss)
{
if (body)
body = body->inlineScan(iss);
if (catches)
{
for (int i = 0; i < catches->dim; i++)
{ Catch *c = catches->tdata()[i];
if (c->handler)
c->handler = c->handler->inlineScan(iss);
}
}
return this;
}
Statement *TryFinallyStatement::inlineScan(InlineScanState *iss)
{
if (body)
body = body->inlineScan(iss);