InlinedScope* InlinedScope::find_scope(int c, int& nofIndirections, OutlinedScope*& out) {
// return the InlinedScope that contains context c
// IN : context no. c for this scope (in interpreter terms)
// OUT: number of indirections required at run time (-1 = in same stack frame,
// 0 = in context of this frame, 1 = in parent context of this frame's context, etc.)
// if the inlined scope is found (nofIndirections = -1) it is returned as the result
// if the inlined scope is not found (nofIndirections >= 0), the highest possible scope
// is returned and out is set to the outlined scope containing the context
assert(c >= 0, "context must be >= 0");
int distance = _method->lexicalDistance(c);
nofIndirections = -1;
Scope* s = this;
out = NULL;
// first, go up as far as possible
for (int d = distance; d > 0 && s->parent()->isInlinedScope(); d--, s = s->parent()) ;
if (d == 0) {
// found scope in our nmethod
return (InlinedScope*)s;
}
// InlinedScope not found; go up the rest of the scopes and count how many
// stack frames are traversed
InlinedScope* top = (InlinedScope*)s;
if (top->allocatesCompiledContext()) nofIndirections++;
Scope* prev = s;
for (s = s->parent(); d > 0; d--, prev = s, s = s->parent()) {
if (s->allocatesCompiledContext()) nofIndirections++;
}
assert(prev->isOutlinedScope(), "must be outlined scope");
out = (OutlinedScope*)prev;
assert(nofIndirections >= 0, "must have at least one context access");
return top;
}
void InlinedScope::addSend(GrowableArray<PReg*>* expStk, bool isSend) {
// add send or prim. call / uncommon branch to this scope and mark locals as debug-visible
if (!expStk) return; // not an exposing send
for (InlinedScope* s = this; s && s->isInlinedScope(); s = s->sender()) {
if (isSend) s->_nofSends++;
s->_nofInterruptPoints++;
s->markLocalsDebugVisible(expStk); // mark locals as debug-visible
}
}
bool InlinedScope::isSenderOf(InlinedScope* callee) const {
assert(callee, "should have a scope");
if (depth > callee->depth) return false;
int d = callee->depth - 1;
for (InlinedScope* s = callee->sender(); s && d >= depth; s = s->sender(), d--) {
if (this == s) return true;
}
return false;
}
void CompiledLoop::discoverLoopNesting() {
// discover enclosing loop (if any) and set up loop header links
for (InlinedScope* s = _scope; s != NULL; s = s->sender()) {
GrowableArray<CompiledLoop*>* loops = s->loops();
for (int i = loops->length() - 1; i >= 0; i--) {
CompiledLoop* l = loops->at(i);
if (l->isInLoop(_loopHeader)) {
// this is out enclosing loop
_loopHeader->set_enclosingLoop(l->loopHeader());
l->loopHeader()->addNestedLoop(_loopHeader);
return;
}
}
}
}
void PerformanceDebugger::finish_reporting() {
// output messages about non-inlined sends
if (DebugPerformance && notInlinedBecauseNmethodTooBig) {
Reporter r(this);
str->print(" did not inline the following sends because the nmethod was getting too big:");
int len = notInlinedBecauseNmethodTooBig->length();
for (int i = 0; i < min(9, len); i++) {
if (i % 3 == 0) str->print("\n ");
InlinedScope* s = notInlinedBecauseNmethodTooBig->at(i);
str->print("%s ", s->key()->print_string());
}
if (i < len) str->print("\n (%d more sends omitted)\n", len);
str->put('\n');
}
}
int InlinedScope::allocateFloatTemporaries(int firstFloatIndex) {
assert(firstFloatIndex >= 0, "illegal firstFloatIndex");
_firstFloatIndex = firstFloatIndex; // start index for first float of this scope
int nofFloatTemps = hasFloatTemporaries() ? nofFloatTemporaries() : 0;
// convert floatLocs into stackLocs
for (int k = 0; k < nofFloatTemps; k++) {
PReg* preg = floatTemporary(k)->preg();
Location loc = preg->loc;
assert(loc.scopeNo() == scopeID() && loc.floatNo() == k, "inconsistency");
preg->loc = Mapping::floatTemporary(scopeID(), k);
assert(preg->loc.isStackLocation(), "must be a stack location");
}
int startFloatIndex = firstFloatIndex + nofFloatTemps; // start index for first float in subscopes
int totalNofFloatsInSubscopes = 0;
// allocate float temporaries of subscopes
int len = _subScopes->length();
for (int i = 0; i < len; i++) {
InlinedScope* scope = _subScopes->at(i);
totalNofFloatsInSubscopes = max(totalNofFloatsInSubscopes, scope->allocateFloatTemporaries(startFloatIndex));
}
return nofFloatTemps + totalNofFloatsInSubscopes;
}
void Compiler::computeBlockInfo() {
FlagSetting(EliminateUnneededNodes, true); // unused context nodes must be eliminated
GrowableArray<InlinedScope*>* allContexts = new GrowableArray<InlinedScope*>(25);
topScope->collectContextInfo(allContexts);
// for now, just allocate all contexts as in interpreter
// fix this later: collect all uplevel-accessed PRegs at same loop depth, form physical
// contexts for these
// also, if uplevel-read and single def --> could copy into context and keep
// stack/register copy
// remove all unused contexts
// need to iterate because removing a nested context may enable removal of a parent context
// (could avoid iteration with topo sort, but there are few contexts anyway)
bool changed = EliminateContexts;
while (changed) {
changed = false;
for (int i = allContexts->length() - 1; i >= 0; i--) {
InlinedScope* s = allContexts->at(i);
if (s == NULL) continue;
PReg* contextPR = s->context();
assert(contextPR->isSinglyAssigned(), "should have exactly one def");
GrowableArray<Expr*>* temps = s->contextTemporaries();
bool noUplevelAccesses = true;
// check if all context temps can be stack-allocated
for (int j = temps->length() - 1; j >= 0; j--) {
PReg* r = temps->at(j)->preg();
if (r->uplevelR() || r->uplevelW() // this temp is still uplevel-accessed, so can't eliminate context
|| (r->isBlockPReg() && !r->isUnused()) // this block still forces a context
) {
noUplevelAccesses = false;
break;
}
}
// TO DO: check if context is needed for NLRs
// (noUplevelAccesses alone does not allow elimination)
if (/*noUplevelAccesses || */contextPR->isSinglyUsed()) {
// can eliminate context -- no uplevel-accessed vars
// (single use is context initializer)
if (CompilerDebug) cout(PrintEliminateContexts)->print("%*s*eliminating context %s\n", s->depth, "", contextPR->safeName());
contextPR->scope()->gen()->removeContextCreation();
allContexts->at_put(i, NULL); // make code generator break if it tries to access this context
changed = true;
}
}
}
// now collect all remaining contexts
int i = allContexts->length();
contextList = new GrowableArray<InlinedScope*>(i, i, NULL);
while (i-- > 0) {
// should merge several contexts into one physical context if possible
// fix this later
InlinedScope* s = allContexts->at(i);
if (s == NULL) continue;
PReg* contextPR = s->context();
if (CompilerDebug) {
cout(PrintEliminateContexts)->print("%*s*could not eliminate context %s in scope %s\n",
s->depth, "", contextPR->safeName(), s->key()->print_string());
}
reporter->report_context(s);
contextList->at_put(i, s);
ContextCreateNode* c = s->contextInitializer()->creator();
c->set_contextNo(i);
GrowableArray<Expr*>* temps = s->contextTemporaries();
// allocate the temps in this context (but only if they're used)
int ntemps = temps->length();
int size = 0;
for (int j = 0; j < ntemps; j++) {
PReg* p = temps->at(j)->preg();
// should be:
// if (p->isUsed() && (p->uplevelR() || p->uplevelW())) {
// but doesn't work yet (probably must fix set_self_via_context etc.)
// -Urs 6/96
if (p->isUsed()) {
// allocate p to context temp
assert(p->scope() == s || p->isBlockPReg(), "oops");
Location loc = Mapping::contextTemporary(i, size, s->scopeID());
if (p->isBlockPReg()) {
// Blocks aren't actually assigned (at the PReg level) so that the inlining info
// isn't lost. Thus we need to create a fake destination here if the context exists.
SAPReg* dest = new SAPReg(s, loc, true, true, PrologueBCI, EpilogueBCI);
Expr* e = new UnknownExpr(dest, NULL);
//contextPR->scope()->contextInitializer()->initialize(j, init);
temps->at_put(j, e);
} else {
p->allocateTo(loc);
}
size++;
}
}
c->set_sizeOfContext(size);
if (size < ntemps && c->scope()->number_of_noninlined_blocks() > 0) {
// this hasn't been exercised much
compiler_warning("while compiling %s: eliminated some context temps", key->print_string());
}
}
// Compute the number of noninlined blocks for the nmethod and allocate
const int nblocks = topScope->number_of_noninlined_blocks();
if (is_method_compile() || nblocks > 0) {
// allocate nblocks+1 jumpTable entries
const jumpTableID id = Universe::code->jump_table()->allocate(nblocks + 1);
if (is_method_compile()) {
main_jumpTable_id = id;
} else {
promoted_jumpTable_id = id;
}
// first is for nmethod itself
int block_index = 1;
for (int i = bbIterator->exposedBlks->length() - 1; i >= 0; i--) {
BlockPReg* blk = bbIterator->exposedBlks->at(i);
if (blk->isUsed()) {
assert(block_index <= nblocks, "nblocks too small");
blk->closure()->set_id(id.sub(block_index++));
}
}
assert(nblocks + 1 == block_index, "just checking");
}
}
void InlinedScope::generateDebugInfo() {
// Generate debug info for the common parts of methods and blocks
if (PrintDebugInfoGeneration) {
if (isMethodScope()) {
std->print_cr("self: %s", _self->preg()->name());
} else {
std->print_cr("no receiver (block method)");
}
}
ScopeDescRecorder* rec = theCompiler->scopeDescRecorder();
int len, i;
if (!isLite()) {
// temporaries
if (hasTemporaries()) {
len = _temporaries->length();
for (i = 0; i < len; i++) {
PReg* preg = _temporaries->at(i)->preg();
rec->addTemporary(_scopeInfo, i, preg->createLogicalAddress());
if (PrintDebugInfoGeneration) std->print_cr("temp[%2d]: %s", i, preg->name());
}
}
// float temporaries
if (hasFloatTemporaries()) {
len = _floatTemporaries->length();
for (i = 0; i < len; i++) {
PReg* preg = _floatTemporaries->at(i)->preg();
rec->addTemporary(_scopeInfo, i, preg->createLogicalAddress());
if (PrintDebugInfoGeneration) std->print_cr("float[%2d]: %s", i, preg->name());
}
}
// context temporaries
if (allocatesInterpretedContext()) {
len = _contextTemporaries->length();
for (i = 0; i < len; i++) {
PReg* preg = _contextTemporaries->at(i)->preg();
rec->addContextTemporary(_scopeInfo, i, preg->createLogicalAddress());
if (PrintDebugInfoGeneration) std->print_cr("c_temp[%2d]: %s", i, preg->name());
}
}
// expr stack
len = _exprStackElems->length();
for (i = 0; i < len; i++) {
Expr* elem = _exprStackElems->at(i);
if (elem != NULL) {
PReg* r = elem->preg()->cpReg();
if (r->scope()->isSenderOrSame(this)) {
// Note: Is it still needed to create this info here, since the
// PReg locations may change over time and thus produce more
// debug info than actually needed for the new backend. Discuss
// this with Lars.
rec->addExprStack(_scopeInfo, i, r->createLogicalAddress());
if (PrintDebugInfoGeneration) std->print_cr("expr[%2d]: %s", i, r->name());
} else {
// r's scope is too low (i.e. it's not actually live anymore)
// this can only happen if the expression is discarded; thus it's safe not to describe this entry
// Urs 5/96
// fix this: should check that bci (i) is statement end (or r is NoPReg)
}
}
}
}
// subscopes
len = _subScopes->length();
for (i = 0; i < len; i++) {
InlinedScope* s = _subScopes->at(i);
if (PrintDebugInfoGeneration) std->print_cr("Subscope %d (id = %d):", i, s->scopeID());
s->generateDebugInfo();
}
}
