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f955de9bc0437586a5809631fbff855d94de0e4f
sdk/runtime/vm/handles_impl.h
T
kmillikin@google.com 41e77a0a9e Initial implementation of a flow-graph builder for Dart's AST. 
Visit the AST and generate an instruction (ie, not basic-block) flow
graph.

The flow graph for the simple function:

main() {
  var f = 1;
  var n = 5;
  while (n > 0) {
    f = f * n;
    n = n - 1;
  }
  print(f);
}

is:

       1: StoreLocal(f, #1)
       2: StoreLocal(n, #5)
       3: [join]
       4: t0 <-LoadLocal(n)
       5: t0 <-InstanceCall(>, t0, #0)
       6: if t0 goto(7, 15)
       7: [target]
       8: t0 <-LoadLocal(f)
       9: t1 <-LoadLocal(n)
      10: t0 <-InstanceCall(*, t0, t1)
      11: StoreLocal(f, t0)
      12: t0 <-LoadLocal(n)
      13: t0 <-InstanceCall(-, t0, #1)
      14: StoreLocal(n, t0) goto 3
      15: [target]
      16: t0 <-LoadLocal(f)
      17: StaticCall(print, t0)
      18: return #null

BUG=
TEST=

Review URL: https://chromiumcodereview.appspot.com//9414003

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@4460 260f80e4-7a28-3924-810f-c04153c831b5
2012-02-22 15:20:13 +00:00

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// Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
#ifndef VM_HANDLES_IMPL_H_
#define VM_HANDLES_IMPL_H_
#include "vm/visitor.h"
namespace dart {
DECLARE_DEBUG_FLAG(bool, trace_handles_count);
template <int kHandleSizeInWords, int kHandlesPerChunk, int kOffsetOfRawPtr>
void Handles<kHandleSizeInWords,
kHandlesPerChunk,
kOffsetOfRawPtr>::VisitObjectPointers(
ObjectPointerVisitor* visitor) {
// Visit all zone handles.
HandlesBlock* block = zone_blocks_;
while (block != NULL) {
block->VisitObjectPointers(visitor);
block = block->next_block();
}
// Visit all scoped handles.
block = &first_scoped_block_;
do {
block->VisitObjectPointers(visitor);
block = block->next_block();
} while (block != NULL);
}
template <int kHandleSizeInWords, int kHandlesPerChunk, int kOffsetOfRawPtr>
void Handles<kHandleSizeInWords,
kHandlesPerChunk,
kOffsetOfRawPtr>::Visit(HandleVisitor* visitor) {
// Visit all zone handles.
HandlesBlock* block = zone_blocks_;
while (block != NULL) {
block->Visit(visitor);
block = block->next_block();
}
// Visit all scoped handles.
block = &first_scoped_block_;
do {
block->Visit(visitor);
block = block->next_block();
} while (block != NULL);
}
// Figure out the current handle scope using the current Isolate and
// allocate a handle in that scope. The function assumes that a
// current Isolate, current zone and current handle scope exist. It
// asserts for this appropriately.
template <int kHandleSizeInWords, int kHandlesPerChunk, int kOffsetOfRawPtr>
uword Handles<kHandleSizeInWords,
kHandlesPerChunk,
kOffsetOfRawPtr>::AllocateHandle(Isolate* isolate) {
ASSERT(isolate != NULL);
ASSERT(isolate->current_zone() != NULL);
ASSERT(isolate->top_handle_scope() != NULL);
ASSERT(isolate->no_handle_scope_depth() == 0);
Handles* handles = isolate->current_zone()->handles();
ASSERT(handles != NULL);
return handles->AllocateScopedHandle();
}
// Figure out the current zone using the current Isolate and
// allocate a handle in that zone. The function assumes that a
// current Isolate and current zone exist. It asserts for
// this appropriately.
template <int kHandleSizeInWords, int kHandlesPerChunk, int kOffsetOfRawPtr>
uword Handles<kHandleSizeInWords,
kHandlesPerChunk,
kOffsetOfRawPtr>::AllocateZoneHandle(Isolate* isolate) {
ASSERT(isolate != NULL);
ASSERT(isolate->current_zone() != NULL);
ASSERT(isolate->no_handle_scope_depth() == 0);
Handles* handles = isolate->current_zone()->handles();
ASSERT(handles != NULL);
return handles->AllocateHandleInZone();
}
// Figure out the current zone using the current Isolate and
// check if the specified handle has been allocated in this zone.
template <int kHandleSizeInWords, int kHandlesPerChunk, int kOffsetOfRawPtr>
bool Handles<kHandleSizeInWords,
kHandlesPerChunk,
kOffsetOfRawPtr>::IsZoneHandle(uword handle) {
// TODO(5411412): Accessing the current isolate is a performance problem,
// consider passing it down as a parameter.
Isolate* isolate = Isolate::Current();
ASSERT(isolate != NULL);
ASSERT(isolate->current_zone() != NULL);
Handles* handles = isolate->current_zone()->handles();
ASSERT(handles != NULL);
return handles->IsValidZoneHandle(handle);
}
template <int kHandleSizeInWords, int kHandlesPerChunk, int kOffsetOfRawPtr>
void Handles<kHandleSizeInWords,
kHandlesPerChunk,
kOffsetOfRawPtr>::DeleteAll() {
// Delete all the zone allocated handle blocks.
DeleteHandleBlocks(zone_blocks_);
zone_blocks_ = NULL;
// Delete all the scoped handle blocks.
scoped_blocks_ = first_scoped_block_.next_block();
DeleteHandleBlocks(scoped_blocks_);
first_scoped_block_.ReInit();
scoped_blocks_ = &first_scoped_block_;
}
template <int kHandleSizeInWords, int kHandlesPerChunk, int kOffsetOfRawPtr>
void Handles<kHandleSizeInWords,
kHandlesPerChunk,
kOffsetOfRawPtr>::DeleteHandleBlocks(
HandlesBlock* blocks) {
while (blocks != NULL) {
HandlesBlock* block = blocks;
blocks = blocks->next_block();
delete block;
}
}
template <int kHandleSizeInWords, int kHandlesPerChunk, int kOffsetOfRawPtr>
void Handles<kHandleSizeInWords,
kHandlesPerChunk,
kOffsetOfRawPtr>::SetupNextScopeBlock() {
#if defined(DEBUG)
if (FLAG_trace_handles_count) {
OS::Print("Handle Counts: Zone = %d, Scoped = %d\n",
CountZoneHandles(), CountScopedHandles());
}
#endif
if (scoped_blocks_->next_block() == NULL) {
scoped_blocks_->set_next_block(new HandlesBlock(NULL));
}
scoped_blocks_ = scoped_blocks_->next_block();
scoped_blocks_->set_next_handle_slot(0);
#if defined(DEBUG)
scoped_blocks_->ZapFreeHandles();
#endif
}
// Validation of the handle involves iterating through all the
// handle blocks to check if the handle is valid, please
// use this only in ASSERT code for verification purposes.
template <int kHandleSizeInWords, int kHandlesPerChunk, int kOffsetOfRawPtr>
bool Handles<kHandleSizeInWords,
kHandlesPerChunk,
kOffsetOfRawPtr>::IsValidScopedHandle(uword handle) const {
const HandlesBlock* iterator = &first_scoped_block_;
while (iterator != NULL) {
if (iterator->IsValidHandle(handle)) {
return true;
}
iterator = iterator->next_block();
}
return false;
}
template <int kHandleSizeInWords, int kHandlesPerChunk, int kOffsetOfRawPtr>
bool Handles<kHandleSizeInWords,
kHandlesPerChunk,
kOffsetOfRawPtr>::IsValidZoneHandle(uword handle) const {
const HandlesBlock* iterator = zone_blocks_;
while (iterator != NULL) {
if (iterator->IsValidHandle(handle)) {
return true;
}
iterator = iterator->next_block();
}
return false;
}
template <int kHandleSizeInWords, int kHandlesPerChunk, int kOffsetOfRawPtr>
void Handles<kHandleSizeInWords,
kHandlesPerChunk,
kOffsetOfRawPtr>::SetupNextZoneBlock() {
#if defined(DEBUG)
if (FLAG_trace_handles_count) {
OS::Print("Handle Counts: Zone = %d, Scoped = %d\n",
CountZoneHandles(), CountScopedHandles());
}
#endif
zone_blocks_ = new HandlesBlock(zone_blocks_);
ASSERT(zone_blocks_ != NULL);
}
#if defined(DEBUG)
template <int kHandleSizeInWords, int kHandlesPerChunk, int kOffsetOfRawPtr>
void Handles<kHandleSizeInWords,
kHandlesPerChunk,
kOffsetOfRawPtr>::VerifyScopedHandleState() {
HandlesBlock* block = &first_scoped_block_;
const intptr_t end_index = (kHandleSizeInWords * kHandlesPerChunk);
do {
if (scoped_blocks_ == block && block->next_handle_slot() <= end_index) {
return;
}
block = block->next_block();
} while (block != NULL);
ASSERT(false);
}
template <int kHandleSizeInWords, int kHandlesPerChunk, int kOffsetOfRawPtr>
void Handles<kHandleSizeInWords,
kHandlesPerChunk,
kOffsetOfRawPtr>::ZapFreeScopedHandles() {
HandlesBlock* block = scoped_blocks_;
while (block != NULL) {
block->ZapFreeHandles();
block = block->next_block();
}
}
#endif
template <int kHandleSizeInWords, int kHandlesPerChunk, int kOffsetOfRawPtr>
int Handles<kHandleSizeInWords,
kHandlesPerChunk,
kOffsetOfRawPtr>::CountScopedHandles() const {
int count = 0;
const HandlesBlock* block = &first_scoped_block_;
do {
count += block->HandleCount();
if (block == scoped_blocks_) {
return count;
}
block = block->next_block();
} while (block != NULL);
UNREACHABLE();
return 0;
}
template <int kHandleSizeInWords, int kHandlesPerChunk, int kOffsetOfRawPtr>
int Handles<kHandleSizeInWords,
kHandlesPerChunk,
kOffsetOfRawPtr>::CountZoneHandles() const {
int count = 0;
const HandlesBlock* block = zone_blocks_;
while (block != NULL) {
count += block->HandleCount();
block = block->next_block();
}
return count;
}
template <int kHandleSizeInWords, int kHandlesPerChunk, int kOffsetOfRawPtr>
Handles<kHandleSizeInWords,
kHandlesPerChunk,
kOffsetOfRawPtr>::HandlesBlock::~HandlesBlock() {
#if defined(DEBUG)
ReInit();
#endif
}
template <int kHandleSizeInWords, int kHandlesPerChunk, int kOffsetOfRawPtr>
void Handles<kHandleSizeInWords,
kHandlesPerChunk,
kOffsetOfRawPtr>::HandlesBlock::ReInit() {
next_handle_slot_ = 0;
next_block_ = NULL;
#if defined(DEBUG)
ZapFreeHandles();
#endif
}
template <int kHandleSizeInWords, int kHandlesPerChunk, int kOffsetOfRawPtr>
void Handles<kHandleSizeInWords,
kHandlesPerChunk,
kOffsetOfRawPtr>::HandlesBlock::VisitObjectPointers(
ObjectPointerVisitor* visitor) {
ASSERT(visitor != NULL);
for (intptr_t i = 0; i < next_handle_slot_; i += kHandleSizeInWords) {
visitor->VisitPointer(
reinterpret_cast<RawObject**>(&data_[i + kOffsetOfRawPtr/kWordSize]));
}
}
template <int kHandleSizeInWords, int kHandlesPerChunk, int kOffsetOfRawPtr>
void Handles<kHandleSizeInWords,
kHandlesPerChunk,
kOffsetOfRawPtr>::HandlesBlock::Visit(HandleVisitor* visitor) {
ASSERT(visitor != NULL);
for (intptr_t i = 0; i < next_handle_slot_; i += kHandleSizeInWords) {
visitor->VisitHandle(reinterpret_cast<uword>(&data_[i]));
}
}
#if defined(DEBUG)
template <int kHandleSizeInWords, int kHandlesPerChunk, int kOffsetOfRawPtr>
void Handles<kHandleSizeInWords,
kHandlesPerChunk,
kOffsetOfRawPtr>::HandlesBlock::ZapFreeHandles() {
// Reinitialize the handle area to some uninitialized value.
for (intptr_t i = next_handle_slot_;
i < (kHandleSizeInWords * kHandlesPerChunk);
i++) {
data_[i] = kZapUninitializedWord;
}
}
#endif
template <int kHandleSizeInWords, int kHandlesPerChunk, int kOffsetOfRawPtr>
int Handles<kHandleSizeInWords,
kHandlesPerChunk,
kOffsetOfRawPtr>::HandlesBlock::HandleCount() const {
return (next_handle_slot_ / kHandleSizeInWords);
}
} // namespace dart
#endif // VM_HANDLES_IMPL_H_
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