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// Copyright 2012 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following
// disclaimer in the documentation and/or other materials provided
// with the distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#include "v8.h"
#include "interface.h"
namespace v8 {
namespace internal {
static bool Match(void* key1, void* key2) {
String* name1 = *static_cast<String**>(key1);
String* name2 = *static_cast<String**>(key2);
ASSERT(name1->IsInternalizedString());
ASSERT(name2->IsInternalizedString());
return name1 == name2;
}
Interface* Interface::Lookup(Handle<String> name, Zone* zone) {
ASSERT(IsModule());
ZoneHashMap* map = Chase()->exports_;
if (map == NULL) return NULL;
ZoneAllocationPolicy allocator(zone);
ZoneHashMap::Entry* p = map->Lookup(name.location(), name->Hash(), false,
allocator);
if (p == NULL) return NULL;
ASSERT(*static_cast<String**>(p->key) == *name);
ASSERT(p->value != NULL);
return static_cast<Interface*>(p->value);
}
#ifdef DEBUG
// Current nesting depth for debug output.
class Nesting {
public:
Nesting() { current_ += 2; }
~Nesting() { current_ -= 2; }
static int current() { return current_; }
private:
static int current_;
};
int Nesting::current_ = 0;
#endif
void Interface::DoAdd(
void* name, uint32_t hash, Interface* interface, Zone* zone, bool* ok) {
MakeModule(ok);
if (!*ok) return;
#ifdef DEBUG
if (FLAG_print_interface_details) {
PrintF("%*s# Adding...\n", Nesting::current(), "");
PrintF("%*sthis = ", Nesting::current(), "");
this->Print(Nesting::current());
PrintF("%*s%s : ", Nesting::current(), "",
(*static_cast<String**>(name))->ToAsciiArray());
interface->Print(Nesting::current());
}
#endif
ZoneHashMap** map = &Chase()->exports_;
ZoneAllocationPolicy allocator(zone);
if (*map == NULL) {
*map = new(zone->New(sizeof(ZoneHashMap)))
ZoneHashMap(Match, ZoneHashMap::kDefaultHashMapCapacity, allocator);
}
ZoneHashMap::Entry* p = (*map)->Lookup(name, hash, !IsFrozen(), allocator);
if (p == NULL) {
// This didn't have name but was frozen already, that's an error.
*ok = false;
} else if (p->value == NULL) {
p->value = interface;
} else {
#ifdef DEBUG
Nesting nested;
#endif
static_cast<Interface*>(p->value)->Unify(interface, zone, ok);
}
#ifdef DEBUG
if (FLAG_print_interface_details) {
PrintF("%*sthis' = ", Nesting::current(), "");
this->Print(Nesting::current());
PrintF("%*s# Added.\n", Nesting::current(), "");
}
#endif
}
void Interface::Unify(Interface* that, Zone* zone, bool* ok) {
if (this->forward_) return this->Chase()->Unify(that, zone, ok);
if (that->forward_) return this->Unify(that->Chase(), zone, ok);
ASSERT(this->forward_ == NULL);
ASSERT(that->forward_ == NULL);
*ok = true;
if (this == that) return;
if (this->IsValue()) {
that->MakeValue(ok);
if (*ok && this->IsConst()) that->MakeConst(ok);
return;
}
if (that->IsValue()) {
this->MakeValue(ok);
if (*ok && that->IsConst()) this->MakeConst(ok);
return;
}
#ifdef DEBUG
if (FLAG_print_interface_details) {
PrintF("%*s# Unifying...\n", Nesting::current(), "");
PrintF("%*sthis = ", Nesting::current(), "");
this->Print(Nesting::current());
PrintF("%*sthat = ", Nesting::current(), "");
that->Print(Nesting::current());
}
#endif
// Merge the smaller interface into the larger, for performance.
if (this->exports_ != NULL && (that->exports_ == NULL ||
this->exports_->occupancy() >= that->exports_->occupancy())) {
this->DoUnify(that, ok, zone);
} else {
that->DoUnify(this, ok, zone);
}
#ifdef DEBUG
if (FLAG_print_interface_details) {
PrintF("%*sthis' = ", Nesting::current(), "");
this->Print(Nesting::current());
PrintF("%*sthat' = ", Nesting::current(), "");
that->Print(Nesting::current());
PrintF("%*s# Unified.\n", Nesting::current(), "");
}
#endif
}
void Interface::DoUnify(Interface* that, bool* ok, Zone* zone) {
ASSERT(this->forward_ == NULL);
ASSERT(that->forward_ == NULL);
ASSERT(!this->IsValue());
ASSERT(!that->IsValue());
ASSERT(this->index_ == -1);
ASSERT(that->index_ == -1);
ASSERT(*ok);
#ifdef DEBUG
Nesting nested;
#endif
// Try to merge all members from that into this.
ZoneHashMap* map = that->exports_;
if (map != NULL) {
for (ZoneHashMap::Entry* p = map->Start(); p != NULL; p = map->Next(p)) {
this->DoAdd(p->key, p->hash, static_cast<Interface*>(p->value), zone, ok);
if (!*ok) return;
}
}
// If the new interface is larger than that's, then there were members in
// 'this' which 'that' didn't have. If 'that' was frozen that is an error.
int this_size = this->exports_ == NULL ? 0 : this->exports_->occupancy();
int that_size = map == NULL ? 0 : map->occupancy();
if (that->IsFrozen() && this_size > that_size) {
*ok = false;
return;
}
// Merge interfaces.
this->flags_ |= that->flags_;
that->forward_ = this;
}
#ifdef DEBUG
void Interface::Print(int n) {
int n0 = n > 0 ? n : 0;
if (FLAG_print_interface_details) {
PrintF("%p", static_cast<void*>(this));
for (Interface* link = this->forward_; link != NULL; link = link->forward_)
PrintF("->%p", static_cast<void*>(link));
PrintF(" ");
}
if (IsUnknown()) {
PrintF("unknown\n");
} else if (IsConst()) {
PrintF("const\n");
} else if (IsValue()) {
PrintF("value\n");
} else if (IsModule()) {
PrintF("module %d %s{", Index(), IsFrozen() ? "" : "(unresolved) ");
ZoneHashMap* map = Chase()->exports_;
if (map == NULL || map->occupancy() == 0) {
PrintF("}\n");
} else if (n < 0 || n0 >= 2 * FLAG_print_interface_depth) {
// Avoid infinite recursion on cyclic types.
PrintF("...}\n");
} else {
PrintF("\n");
for (ZoneHashMap::Entry* p = map->Start(); p != NULL; p = map->Next(p)) {
String* name = *static_cast<String**>(p->key);
Interface* interface = static_cast<Interface*>(p->value);
PrintF("%*s%s : ", n0 + 2, "", name->ToAsciiArray());
interface->Print(n0 + 2);
}
PrintF("%*s}\n", n0, "");
}
}
}
#endif
} } // namespace v8::internal
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