/
flow_graph_compiler.cc
2099 lines (1899 loc) · 78.3 KB
/
flow_graph_compiler.cc
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// Copyright (c) 2013, 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.
#include "vm/globals.h" // Needed here to get TARGET_ARCH_XXX.
#include "vm/compiler/backend/flow_graph_compiler.h"
#include "vm/bit_vector.h"
#include "vm/compiler/backend/code_statistics.h"
#include "vm/compiler/backend/il_printer.h"
#include "vm/compiler/backend/inliner.h"
#include "vm/compiler/backend/linearscan.h"
#include "vm/compiler/backend/locations.h"
#include "vm/compiler/cha.h"
#include "vm/compiler/intrinsifier.h"
#include "vm/compiler/jit/compiler.h"
#include "vm/dart_entry.h"
#include "vm/debugger.h"
#include "vm/deopt_instructions.h"
#include "vm/exceptions.h"
#include "vm/flags.h"
#include "vm/kernel_isolate.h"
#include "vm/log.h"
#include "vm/longjump.h"
#include "vm/object_store.h"
#include "vm/parser.h"
#include "vm/raw_object.h"
#include "vm/resolver.h"
#include "vm/service_isolate.h"
#include "vm/stack_frame.h"
#include "vm/stub_code.h"
#include "vm/symbols.h"
#include "vm/timeline.h"
#include "vm/type_testing_stubs.h"
namespace dart {
DEFINE_FLAG(bool,
trace_inlining_intervals,
false,
"Inlining interval diagnostics");
#if !defined(DART_PRECOMPILED_RUNTIME)
DEFINE_FLAG(bool,
enable_simd_inline,
true,
"Enable inlining of SIMD related method calls.");
DEFINE_FLAG(int,
min_optimization_counter_threshold,
5000,
"The minimum invocation count for a function.");
DEFINE_FLAG(int,
optimization_counter_scale,
2000,
"The scale of invocation count, by size of the function.");
DEFINE_FLAG(bool, source_lines, false, "Emit source line as assembly comment.");
DECLARE_FLAG(bool, code_comments);
DECLARE_FLAG(charp, deoptimize_filter);
DECLARE_FLAG(bool, intrinsify);
DECLARE_FLAG(int, regexp_optimization_counter_threshold);
DECLARE_FLAG(int, reoptimization_counter_threshold);
DECLARE_FLAG(int, stacktrace_every);
DECLARE_FLAG(charp, stacktrace_filter);
DECLARE_FLAG(bool, trace_compiler);
// Assign locations to incoming arguments, i.e., values pushed above spill slots
// with PushArgument. Recursively allocates from outermost to innermost
// environment.
void CompilerDeoptInfo::AllocateIncomingParametersRecursive(
Environment* env,
intptr_t* stack_height) {
if (env == NULL) return;
AllocateIncomingParametersRecursive(env->outer(), stack_height);
for (Environment::ShallowIterator it(env); !it.Done(); it.Advance()) {
if (it.CurrentLocation().IsInvalid() &&
it.CurrentValue()->definition()->IsPushArgument()) {
it.SetCurrentLocation(
Location::StackSlot(FrameSlotForVariableIndex(-*stack_height)));
(*stack_height)++;
}
}
}
void CompilerDeoptInfo::EmitMaterializations(Environment* env,
DeoptInfoBuilder* builder) {
for (Environment::DeepIterator it(env); !it.Done(); it.Advance()) {
if (it.CurrentLocation().IsInvalid()) {
MaterializeObjectInstr* mat =
it.CurrentValue()->definition()->AsMaterializeObject();
ASSERT(mat != NULL);
builder->AddMaterialization(mat);
}
}
}
FlowGraphCompiler::FlowGraphCompiler(
Assembler* assembler,
FlowGraph* flow_graph,
const ParsedFunction& parsed_function,
bool is_optimizing,
SpeculativeInliningPolicy* speculative_policy,
const GrowableArray<const Function*>& inline_id_to_function,
const GrowableArray<TokenPosition>& inline_id_to_token_pos,
const GrowableArray<intptr_t>& caller_inline_id,
CodeStatistics* stats /* = NULL */)
: thread_(Thread::Current()),
zone_(Thread::Current()->zone()),
assembler_(assembler),
parsed_function_(parsed_function),
flow_graph_(*flow_graph),
block_order_(*flow_graph->CodegenBlockOrder(is_optimizing)),
current_block_(NULL),
exception_handlers_list_(NULL),
pc_descriptors_list_(NULL),
stackmap_table_builder_(NULL),
code_source_map_builder_(NULL),
catch_entry_state_maps_builder_(NULL),
block_info_(block_order_.length()),
deopt_infos_(),
static_calls_target_table_(),
is_optimizing_(is_optimizing),
speculative_policy_(speculative_policy),
may_reoptimize_(false),
intrinsic_mode_(false),
stats_(stats),
double_class_(
Class::ZoneHandle(isolate()->object_store()->double_class())),
mint_class_(Class::ZoneHandle(isolate()->object_store()->mint_class())),
float32x4_class_(
Class::ZoneHandle(isolate()->object_store()->float32x4_class())),
float64x2_class_(
Class::ZoneHandle(isolate()->object_store()->float64x2_class())),
int32x4_class_(
Class::ZoneHandle(isolate()->object_store()->int32x4_class())),
list_class_(Class::ZoneHandle(Library::Handle(Library::CoreLibrary())
.LookupClass(Symbols::List()))),
parallel_move_resolver_(this),
pending_deoptimization_env_(NULL),
deopt_id_to_ic_data_(NULL),
edge_counters_array_(Array::ZoneHandle()) {
ASSERT(flow_graph->parsed_function().function().raw() ==
parsed_function.function().raw());
if (!is_optimizing) {
const intptr_t len = thread()->deopt_id();
deopt_id_to_ic_data_ = new (zone()) ZoneGrowableArray<const ICData*>(len);
deopt_id_to_ic_data_->SetLength(len);
for (intptr_t i = 0; i < len; i++) {
(*deopt_id_to_ic_data_)[i] = NULL;
}
// TODO(fschneider): Abstract iteration into ICDataArrayIterator.
const Array& old_saved_ic_data =
Array::Handle(zone(), flow_graph->function().ic_data_array());
const intptr_t saved_len =
old_saved_ic_data.IsNull() ? 0 : old_saved_ic_data.Length();
for (intptr_t i = 1; i < saved_len; i++) {
ICData& ic_data = ICData::ZoneHandle(zone());
ic_data ^= old_saved_ic_data.At(i);
(*deopt_id_to_ic_data_)[ic_data.deopt_id()] = &ic_data;
}
}
ASSERT(assembler != NULL);
ASSERT(!list_class_.IsNull());
#if defined(PRODUCT)
const bool stack_traces_only = true;
#else
const bool stack_traces_only = false;
#endif
code_source_map_builder_ = new (zone_)
CodeSourceMapBuilder(stack_traces_only, caller_inline_id,
inline_id_to_token_pos, inline_id_to_function);
}
bool FlowGraphCompiler::IsUnboxedField(const Field& field) {
bool valid_class =
(SupportsUnboxedDoubles() && (field.guarded_cid() == kDoubleCid)) ||
(SupportsUnboxedSimd128() && (field.guarded_cid() == kFloat32x4Cid)) ||
(SupportsUnboxedSimd128() && (field.guarded_cid() == kFloat64x2Cid));
return field.is_unboxing_candidate() && !field.is_final() &&
!field.is_nullable() && valid_class;
}
bool FlowGraphCompiler::IsPotentialUnboxedField(const Field& field) {
return field.is_unboxing_candidate() &&
(FlowGraphCompiler::IsUnboxedField(field) ||
(!field.is_final() && (field.guarded_cid() == kIllegalCid)));
}
void FlowGraphCompiler::InitCompiler() {
pc_descriptors_list_ = new (zone()) DescriptorList(64);
exception_handlers_list_ = new (zone()) ExceptionHandlerList();
catch_entry_state_maps_builder_ = new (zone()) CatchEntryStateMapBuilder();
block_info_.Clear();
// Initialize block info and search optimized (non-OSR) code for calls
// indicating a non-leaf routine and calls without IC data indicating
// possible reoptimization.
for (int i = 0; i < block_order_.length(); ++i) {
block_info_.Add(new (zone()) BlockInfo());
if (is_optimizing() && !flow_graph().IsCompiledForOsr()) {
BlockEntryInstr* entry = block_order_[i];
for (ForwardInstructionIterator it(entry); !it.Done(); it.Advance()) {
Instruction* current = it.Current();
if (current->IsBranch()) {
current = current->AsBranch()->comparison();
}
// In optimized code, ICData is always set in the instructions.
const ICData* ic_data = NULL;
if (current->IsInstanceCall()) {
ic_data = current->AsInstanceCall()->ic_data();
}
if ((ic_data != NULL) && (ic_data->NumberOfUsedChecks() == 0)) {
may_reoptimize_ = true;
}
}
}
}
if (!is_optimizing()) {
// Initialize edge counter array.
const intptr_t num_counters = flow_graph_.preorder().length();
const Array& edge_counters =
Array::Handle(Array::New(num_counters, Heap::kOld));
const Smi& zero_smi = Smi::Handle(Smi::New(0));
for (intptr_t i = 0; i < num_counters; ++i) {
edge_counters.SetAt(i, zero_smi);
}
edge_counters_array_ = edge_counters.raw();
}
}
bool FlowGraphCompiler::CanOptimize() {
return FLAG_optimization_counter_threshold >= 0;
}
bool FlowGraphCompiler::CanOptimizeFunction() const {
return CanOptimize() && !parsed_function().function().HasBreakpoint();
}
bool FlowGraphCompiler::CanOSRFunction() const {
return isolate()->use_osr() && CanOptimizeFunction() && !is_optimizing();
}
bool FlowGraphCompiler::ForceSlowPathForStackOverflow() const {
#if !defined(PRODUCT)
if ((FLAG_stacktrace_every > 0) || (FLAG_deoptimize_every > 0) ||
(isolate()->reload_every_n_stack_overflow_checks() > 0)) {
bool is_auxiliary_isolate = ServiceIsolate::IsServiceIsolate(isolate());
#if !defined(DART_PRECOMPILED_RUNTIME)
// Certain flags should not effect the kernel isolate itself. They might be
// used by tests via the "VMOptions=--..." annotation to test VM
// functionality in the main isolate.
is_auxiliary_isolate =
is_auxiliary_isolate || KernelIsolate::IsKernelIsolate(isolate());
#endif // !defined(DART_PRECOMPILED_RUNTIME)
if (!is_auxiliary_isolate) {
return true;
}
}
if (FLAG_stacktrace_filter != NULL &&
strstr(parsed_function().function().ToFullyQualifiedCString(),
FLAG_stacktrace_filter) != NULL) {
return true;
}
if (is_optimizing() && FLAG_deoptimize_filter != NULL &&
strstr(parsed_function().function().ToFullyQualifiedCString(),
FLAG_deoptimize_filter) != NULL) {
return true;
}
#endif // !defined(PRODUCT)
return false;
}
static bool IsEmptyBlock(BlockEntryInstr* block) {
return !block->IsCatchBlockEntry() && !block->HasNonRedundantParallelMove() &&
block->next()->IsGoto() &&
!block->next()->AsGoto()->HasNonRedundantParallelMove() &&
!block->IsIndirectEntry();
}
void FlowGraphCompiler::CompactBlock(BlockEntryInstr* block) {
BlockInfo* block_info = block_info_[block->postorder_number()];
// Break out of cycles in the control flow graph.
if (block_info->is_marked()) {
return;
}
block_info->mark();
if (IsEmptyBlock(block)) {
// For empty blocks, record a corresponding nonempty target as their
// jump label.
BlockEntryInstr* target = block->next()->AsGoto()->successor();
CompactBlock(target);
block_info->set_jump_label(GetJumpLabel(target));
}
}
void FlowGraphCompiler::CompactBlocks() {
// This algorithm does not garbage collect blocks in place, but merely
// records forwarding label information. In this way it avoids having to
// change join and target entries.
Label* nonempty_label = NULL;
for (intptr_t i = block_order().length() - 1; i >= 1; --i) {
BlockEntryInstr* block = block_order()[i];
// Unoptimized code must emit all possible deoptimization points.
if (is_optimizing()) {
CompactBlock(block);
}
// For nonempty blocks, record the next nonempty block in the block
// order. Since no code is emitted for empty blocks, control flow is
// eligible to fall through to the next nonempty one.
if (!WasCompacted(block)) {
BlockInfo* block_info = block_info_[block->postorder_number()];
block_info->set_next_nonempty_label(nonempty_label);
nonempty_label = GetJumpLabel(block);
}
}
ASSERT(block_order()[0]->IsGraphEntry());
BlockInfo* block_info = block_info_[block_order()[0]->postorder_number()];
block_info->set_next_nonempty_label(nonempty_label);
}
void FlowGraphCompiler::EmitCatchEntryState(Environment* env,
intptr_t try_index) {
#if defined(DART_PRECOMPILER) || defined(DART_PRECOMPILED_RUNTIME)
env = env ? env : pending_deoptimization_env_;
try_index = try_index != CatchClauseNode::kInvalidTryIndex
? try_index
: CurrentTryIndex();
if (is_optimizing() && env != NULL &&
(try_index != CatchClauseNode::kInvalidTryIndex)) {
env = env->Outermost();
CatchBlockEntryInstr* catch_block =
flow_graph().graph_entry()->GetCatchEntry(try_index);
const GrowableArray<Definition*>* idefs =
catch_block->initial_definitions();
catch_entry_state_maps_builder_->NewMapping(assembler()->CodeSize());
// Parameters first.
intptr_t i = 0;
const intptr_t num_direct_parameters = flow_graph().num_direct_parameters();
for (; i < num_direct_parameters; ++i) {
// Don't sync captured parameters. They are not in the environment.
if (flow_graph().captured_parameters()->Contains(i)) continue;
if ((*idefs)[i]->IsConstant()) continue; // Common constants.
Location src = env->LocationAt(i);
intptr_t dest_index = i - num_direct_parameters;
if (!src.IsStackSlot()) {
ASSERT(src.IsConstant());
// Skip dead locations.
if (src.constant().raw() == Symbols::OptimizedOut().raw()) {
continue;
}
intptr_t id =
assembler()->object_pool_wrapper().FindObject(src.constant());
catch_entry_state_maps_builder_->AppendConstant(id, dest_index);
continue;
}
const intptr_t src_index = -VariableIndexForFrameSlot(src.stack_index());
if (src_index != dest_index) {
catch_entry_state_maps_builder_->AppendMove(src_index, dest_index);
}
}
// Process locals. Skip exception_var and stacktrace_var.
intptr_t local_base = num_direct_parameters;
intptr_t ex_idx = local_base - catch_block->exception_var().index().value();
intptr_t st_idx =
local_base - catch_block->stacktrace_var().index().value();
for (; i < flow_graph().variable_count(); ++i) {
// Don't sync captured parameters. They are not in the environment.
if (flow_graph().captured_parameters()->Contains(i)) continue;
if (i == ex_idx || i == st_idx) continue;
if ((*idefs)[i]->IsConstant()) continue; // Common constants.
Location src = env->LocationAt(i);
if (src.IsInvalid()) continue;
intptr_t dest_index = i - num_direct_parameters;
if (!src.IsStackSlot()) {
ASSERT(src.IsConstant());
// Skip dead locations.
if (src.constant().raw() == Symbols::OptimizedOut().raw()) {
continue;
}
intptr_t id =
assembler()->object_pool_wrapper().FindObject(src.constant());
catch_entry_state_maps_builder_->AppendConstant(id, dest_index);
continue;
}
const intptr_t src_index = -VariableIndexForFrameSlot(src.stack_index());
if (src_index != dest_index) {
catch_entry_state_maps_builder_->AppendMove(src_index, dest_index);
}
}
catch_entry_state_maps_builder_->EndMapping();
}
#endif // defined(DART_PRECOMPILER) || defined(DART_PRECOMPILED_RUNTIME)
}
void FlowGraphCompiler::EmitCallsiteMetadata(TokenPosition token_pos,
intptr_t deopt_id,
RawPcDescriptors::Kind kind,
LocationSummary* locs) {
AddCurrentDescriptor(kind, deopt_id, token_pos);
RecordSafepoint(locs);
EmitCatchEntryState();
if (deopt_id != Thread::kNoDeoptId) {
// Marks either the continuation point in unoptimized code or the
// deoptimization point in optimized code, after call.
const intptr_t deopt_id_after = Thread::ToDeoptAfter(deopt_id);
if (is_optimizing()) {
AddDeoptIndexAtCall(deopt_id_after);
} else {
// Add deoptimization continuation point after the call and before the
// arguments are removed.
AddCurrentDescriptor(RawPcDescriptors::kDeopt, deopt_id_after, token_pos);
}
}
}
void FlowGraphCompiler::EmitInstructionPrologue(Instruction* instr) {
if (!is_optimizing()) {
if (instr->CanBecomeDeoptimizationTarget() && !instr->IsGoto()) {
// Instructions that can be deoptimization targets need to record kDeopt
// PcDescriptor corresponding to their deopt id. GotoInstr records its
// own so that it can control the placement.
AddCurrentDescriptor(RawPcDescriptors::kDeopt, instr->deopt_id(),
instr->token_pos());
}
AllocateRegistersLocally(instr);
}
}
void FlowGraphCompiler::EmitSourceLine(Instruction* instr) {
if (!instr->token_pos().IsReal() || (instr->env() == NULL)) {
return;
}
const Script& script =
Script::Handle(zone(), instr->env()->function().script());
intptr_t line_nr;
intptr_t column_nr;
script.GetTokenLocation(instr->token_pos(), &line_nr, &column_nr);
const String& line = String::Handle(zone(), script.GetLine(line_nr));
assembler()->Comment("Line %" Pd " in '%s':\n %s", line_nr,
instr->env()->function().ToFullyQualifiedCString(),
line.ToCString());
}
static void LoopInfoComment(
Assembler* assembler,
const BlockEntryInstr& block,
const ZoneGrowableArray<BlockEntryInstr*>& loop_headers) {
if (Assembler::EmittingComments()) {
for (intptr_t loop_id = 0; loop_id < loop_headers.length(); ++loop_id) {
for (BitVector::Iterator loop_it(loop_headers[loop_id]->loop_info());
!loop_it.Done(); loop_it.Advance()) {
if (loop_it.Current() == block.preorder_number()) {
assembler->Comment(" Loop %" Pd "", loop_id);
}
}
}
}
}
void FlowGraphCompiler::VisitBlocks() {
CompactBlocks();
const ZoneGrowableArray<BlockEntryInstr*>* loop_headers = NULL;
if (Assembler::EmittingComments()) {
// 'loop_headers' were cleared, recompute.
loop_headers = flow_graph().ComputeLoops();
ASSERT(loop_headers != NULL);
}
for (intptr_t i = 0; i < block_order().length(); ++i) {
// Compile the block entry.
BlockEntryInstr* entry = block_order()[i];
assembler()->Comment("B%" Pd "", entry->block_id());
set_current_block(entry);
if (WasCompacted(entry)) {
continue;
}
#if defined(DEBUG) && !defined(TARGET_ARCH_DBC)
if (!is_optimizing()) {
FrameStateClear();
}
#endif
LoopInfoComment(assembler(), *entry, *loop_headers);
entry->set_offset(assembler()->CodeSize());
BeginCodeSourceRange();
ASSERT(pending_deoptimization_env_ == NULL);
pending_deoptimization_env_ = entry->env();
StatsBegin(entry);
entry->EmitNativeCode(this);
StatsEnd(entry);
pending_deoptimization_env_ = NULL;
EndCodeSourceRange(entry->token_pos());
// Compile all successors until an exit, branch, or a block entry.
for (ForwardInstructionIterator it(entry); !it.Done(); it.Advance()) {
Instruction* instr = it.Current();
StatsBegin(instr);
// Compose intervals.
code_source_map_builder_->StartInliningInterval(assembler()->CodeSize(),
instr->inlining_id());
if (FLAG_code_comments || FLAG_disassemble ||
FLAG_disassemble_optimized) {
if (FLAG_source_lines) {
EmitSourceLine(instr);
}
EmitComment(instr);
}
if (instr->IsParallelMove()) {
parallel_move_resolver_.EmitNativeCode(instr->AsParallelMove());
} else {
BeginCodeSourceRange();
EmitInstructionPrologue(instr);
ASSERT(pending_deoptimization_env_ == NULL);
pending_deoptimization_env_ = instr->env();
instr->EmitNativeCode(this);
pending_deoptimization_env_ = NULL;
EmitInstructionEpilogue(instr);
EndCodeSourceRange(instr->token_pos());
}
#if defined(DEBUG) && !defined(TARGET_ARCH_DBC)
if (!is_optimizing()) {
FrameStateUpdateWith(instr);
}
#endif
StatsEnd(instr);
}
#if defined(DEBUG) && !defined(TARGET_ARCH_DBC)
ASSERT(is_optimizing() || FrameStateIsSafeToCall());
#endif
}
set_current_block(NULL);
}
void FlowGraphCompiler::Bailout(const char* reason) {
parsed_function_.Bailout("FlowGraphCompiler", reason);
}
intptr_t FlowGraphCompiler::StackSize() const {
if (is_optimizing_) {
return flow_graph_.graph_entry()->spill_slot_count();
} else {
return parsed_function_.num_stack_locals();
}
}
Label* FlowGraphCompiler::GetJumpLabel(BlockEntryInstr* block_entry) const {
const intptr_t block_index = block_entry->postorder_number();
return block_info_[block_index]->jump_label();
}
bool FlowGraphCompiler::WasCompacted(BlockEntryInstr* block_entry) const {
const intptr_t block_index = block_entry->postorder_number();
return block_info_[block_index]->WasCompacted();
}
Label* FlowGraphCompiler::NextNonEmptyLabel() const {
const intptr_t current_index = current_block()->postorder_number();
return block_info_[current_index]->next_nonempty_label();
}
bool FlowGraphCompiler::CanFallThroughTo(BlockEntryInstr* block_entry) const {
return NextNonEmptyLabel() == GetJumpLabel(block_entry);
}
BranchLabels FlowGraphCompiler::CreateBranchLabels(BranchInstr* branch) const {
Label* true_label = GetJumpLabel(branch->true_successor());
Label* false_label = GetJumpLabel(branch->false_successor());
Label* fall_through = NextNonEmptyLabel();
BranchLabels result = {true_label, false_label, fall_through};
return result;
}
void FlowGraphCompiler::AddSlowPathCode(SlowPathCode* code) {
slow_path_code_.Add(code);
}
void FlowGraphCompiler::GenerateDeferredCode() {
for (intptr_t i = 0; i < slow_path_code_.length(); i++) {
SlowPathCode* const slow_path = slow_path_code_[i];
const CombinedCodeStatistics::EntryCounter stats_tag =
CombinedCodeStatistics::SlowPathCounterFor(
slow_path->instruction()->tag());
SpecialStatsBegin(stats_tag);
BeginCodeSourceRange();
slow_path->GenerateCode(this);
EndCodeSourceRange(slow_path->instruction()->token_pos());
SpecialStatsEnd(stats_tag);
}
for (intptr_t i = 0; i < deopt_infos_.length(); i++) {
BeginCodeSourceRange();
deopt_infos_[i]->GenerateCode(this, i);
EndCodeSourceRange(TokenPosition::kDeferredDeoptInfo);
}
}
void FlowGraphCompiler::AddExceptionHandler(intptr_t try_index,
intptr_t outer_try_index,
intptr_t pc_offset,
TokenPosition token_pos,
bool is_generated,
const Array& handler_types,
bool needs_stacktrace) {
exception_handlers_list_->AddHandler(try_index, outer_try_index, pc_offset,
token_pos, is_generated, handler_types,
needs_stacktrace);
}
void FlowGraphCompiler::SetNeedsStackTrace(intptr_t try_index) {
exception_handlers_list_->SetNeedsStackTrace(try_index);
}
void FlowGraphCompiler::AddDescriptor(RawPcDescriptors::Kind kind,
intptr_t pc_offset,
intptr_t deopt_id,
TokenPosition token_pos,
intptr_t try_index) {
code_source_map_builder_->NoteDescriptor(kind, pc_offset, token_pos);
// When running with optimizations disabled, don't emit deopt-descriptors.
if (!CanOptimize() && (kind == RawPcDescriptors::kDeopt)) return;
pc_descriptors_list_->AddDescriptor(kind, pc_offset, deopt_id, token_pos,
try_index);
}
// Uses current pc position and try-index.
void FlowGraphCompiler::AddCurrentDescriptor(RawPcDescriptors::Kind kind,
intptr_t deopt_id,
TokenPosition token_pos) {
AddDescriptor(kind, assembler()->CodeSize(), deopt_id, token_pos,
CurrentTryIndex());
}
void FlowGraphCompiler::AddNullCheck(intptr_t pc_offset,
TokenPosition token_pos,
intptr_t null_check_name_idx) {
code_source_map_builder_->NoteNullCheck(pc_offset, token_pos,
null_check_name_idx);
}
void FlowGraphCompiler::AddStaticCallTarget(const Function& func) {
ASSERT(func.IsZoneHandle());
static_calls_target_table_.Add(
new (zone()) StaticCallsStruct(assembler()->CodeSize(), &func, NULL));
}
void FlowGraphCompiler::AddStubCallTarget(const Code& code) {
ASSERT(code.IsZoneHandle());
static_calls_target_table_.Add(
new (zone()) StaticCallsStruct(assembler()->CodeSize(), NULL, &code));
}
CompilerDeoptInfo* FlowGraphCompiler::AddDeoptIndexAtCall(intptr_t deopt_id) {
ASSERT(is_optimizing());
ASSERT(!intrinsic_mode());
CompilerDeoptInfo* info =
new (zone()) CompilerDeoptInfo(deopt_id, ICData::kDeoptAtCall,
0, // No flags.
pending_deoptimization_env_);
info->set_pc_offset(assembler()->CodeSize());
deopt_infos_.Add(info);
return info;
}
// This function must be in sync with FlowGraphCompiler::SaveLiveRegisters
// and FlowGraphCompiler::SlowPathEnvironmentFor.
// See StackFrame::VisitObjectPointers for the details of how stack map is
// interpreted.
void FlowGraphCompiler::RecordSafepoint(LocationSummary* locs,
intptr_t slow_path_argument_count) {
if (is_optimizing() || locs->live_registers()->HasUntaggedValues()) {
const intptr_t spill_area_size =
is_optimizing() ? flow_graph_.graph_entry()->spill_slot_count() : 0;
RegisterSet* registers = locs->live_registers();
ASSERT(registers != NULL);
const intptr_t kFpuRegisterSpillFactor = kFpuRegisterSize / kWordSize;
const intptr_t live_registers_size =
registers->CpuRegisterCount() +
(registers->FpuRegisterCount() * kFpuRegisterSpillFactor);
BitmapBuilder* bitmap = locs->stack_bitmap();
// An instruction may have two safepoints in deferred code. The
// call to RecordSafepoint has the side-effect of appending the live
// registers to the bitmap. This is why the second call to RecordSafepoint
// with the same instruction (and same location summary) sees a bitmap that
// is larger that StackSize(). It will never be larger than StackSize() +
// live_registers_size.
// The first safepoint will grow the bitmap to be the size of
// spill_area_size but the second safepoint will truncate the bitmap and
// append the live registers to it again. The bitmap produced by both calls
// will be the same.
#if !defined(TARGET_ARCH_DBC)
ASSERT(bitmap->Length() <= (spill_area_size + live_registers_size));
bitmap->SetLength(spill_area_size);
#else
if (bitmap->Length() <= (spill_area_size + live_registers_size)) {
bitmap->SetLength(Utils::Maximum(bitmap->Length(), spill_area_size));
}
#endif
// Mark the bits in the stack map in the same order we push registers in
// slow path code (see FlowGraphCompiler::SaveLiveRegisters).
//
// Slow path code can have registers at the safepoint.
if (!locs->always_calls()) {
RegisterSet* regs = locs->live_registers();
if (regs->FpuRegisterCount() > 0) {
// Denote FPU registers with 0 bits in the stackmap. Based on the
// assumption that there are normally few live FPU registers, this
// encoding is simpler and roughly as compact as storing a separate
// count of FPU registers.
//
// FPU registers have the highest register number at the highest
// address (i.e., first in the stackmap).
for (intptr_t i = kNumberOfFpuRegisters - 1; i >= 0; --i) {
FpuRegister reg = static_cast<FpuRegister>(i);
if (regs->ContainsFpuRegister(reg)) {
for (intptr_t j = 0; j < kFpuRegisterSpillFactor; ++j) {
bitmap->Set(bitmap->Length(), false);
}
}
}
}
// General purpose registers have the highest register number at the
// highest address (i.e., first in the stackmap).
for (intptr_t i = kNumberOfCpuRegisters - 1; i >= 0; --i) {
Register reg = static_cast<Register>(i);
if (locs->live_registers()->ContainsRegister(reg)) {
bitmap->Set(bitmap->Length(), locs->live_registers()->IsTagged(reg));
}
}
}
// Arguments pushed on top of live registers in the slow path are tagged.
for (intptr_t i = 0; i < slow_path_argument_count; ++i) {
bitmap->Set(bitmap->Length(), true);
}
// The slow path area Outside the spill area contains are live registers
// and pushed arguments for calls inside the slow path.
intptr_t slow_path_bit_count = bitmap->Length() - spill_area_size;
stackmap_table_builder()->AddEntry(assembler()->CodeSize(), bitmap,
slow_path_bit_count);
}
}
// This function must be kept in sync with:
//
// FlowGraphCompiler::RecordSafepoint
// FlowGraphCompiler::SaveLiveRegisters
// MaterializeObjectInstr::RemapRegisters
//
Environment* FlowGraphCompiler::SlowPathEnvironmentFor(
Instruction* instruction) {
if (instruction->env() == NULL) {
ASSERT(!is_optimizing());
return NULL;
}
Environment* env = instruction->env()->DeepCopy(zone());
// 1. Iterate the registers in the order they will be spilled to compute
// the slots they will be spilled to.
intptr_t next_slot = StackSize() + env->CountArgsPushed();
RegisterSet* regs = instruction->locs()->live_registers();
intptr_t fpu_reg_slots[kNumberOfFpuRegisters];
intptr_t cpu_reg_slots[kNumberOfCpuRegisters];
const intptr_t kFpuRegisterSpillFactor = kFpuRegisterSize / kWordSize;
// FPU registers are spilled first from highest to lowest register number.
for (intptr_t i = kNumberOfFpuRegisters - 1; i >= 0; --i) {
FpuRegister reg = static_cast<FpuRegister>(i);
if (regs->ContainsFpuRegister(reg)) {
// We use the lowest address (thus highest index) to identify a
// multi-word spill slot.
next_slot += kFpuRegisterSpillFactor;
fpu_reg_slots[i] = (next_slot - 1);
} else {
fpu_reg_slots[i] = -1;
}
}
// General purpose registers are spilled from highest to lowest register
// number.
for (intptr_t i = kNumberOfCpuRegisters - 1; i >= 0; --i) {
Register reg = static_cast<Register>(i);
if (regs->ContainsRegister(reg)) {
cpu_reg_slots[i] = next_slot++;
} else {
cpu_reg_slots[i] = -1;
}
}
// 2. Iterate the environment and replace register locations with the
// corresponding spill slot locations.
for (Environment::DeepIterator it(env); !it.Done(); it.Advance()) {
Location loc = it.CurrentLocation();
Value* value = it.CurrentValue();
it.SetCurrentLocation(loc.RemapForSlowPath(value->definition(),
cpu_reg_slots, fpu_reg_slots));
}
return env;
}
Label* FlowGraphCompiler::AddDeoptStub(intptr_t deopt_id,
ICData::DeoptReasonId reason,
uint32_t flags) {
if (intrinsic_mode()) {
return &intrinsic_slow_path_label_;
}
// No deoptimization allowed when 'FLAG_precompiled_mode' is set.
if (FLAG_precompiled_mode) {
if (FLAG_trace_compiler) {
THR_Print(
"Retrying compilation %s, suppressing inlining of deopt_id:%" Pd "\n",
parsed_function_.function().ToFullyQualifiedCString(), deopt_id);
}
ASSERT(speculative_policy_->AllowsSpeculativeInlining());
ASSERT(deopt_id != 0); // longjmp must return non-zero value.
Thread::Current()->long_jump_base()->Jump(
deopt_id, Object::speculative_inlining_error());
}
ASSERT(is_optimizing_);
CompilerDeoptInfoWithStub* stub = new (zone()) CompilerDeoptInfoWithStub(
deopt_id, reason, flags, pending_deoptimization_env_);
deopt_infos_.Add(stub);
return stub->entry_label();
}
#if defined(TARGET_ARCH_DBC)
void FlowGraphCompiler::EmitDeopt(intptr_t deopt_id,
ICData::DeoptReasonId reason,
uint32_t flags) {
ASSERT(is_optimizing());
ASSERT(!intrinsic_mode());
// The pending deoptimization environment may be changed after this deopt is
// emitted, so we need to make a copy.
Environment* env_copy = pending_deoptimization_env_->DeepCopy(zone());
CompilerDeoptInfo* info =
new (zone()) CompilerDeoptInfo(deopt_id, reason, flags, env_copy);
deopt_infos_.Add(info);
assembler()->Deopt(0, /*is_eager =*/1);
info->set_pc_offset(assembler()->CodeSize());
}
#endif // defined(TARGET_ARCH_DBC)
void FlowGraphCompiler::FinalizeExceptionHandlers(const Code& code) {
ASSERT(exception_handlers_list_ != NULL);
const ExceptionHandlers& handlers = ExceptionHandlers::Handle(
exception_handlers_list_->FinalizeExceptionHandlers(code.PayloadStart()));
code.set_exception_handlers(handlers);
if (FLAG_compiler_stats) {
Thread* thread = Thread::Current();
INC_STAT(thread, total_code_size,
ExceptionHandlers::InstanceSize(handlers.num_entries()));
INC_STAT(thread, total_code_size, handlers.num_entries() * sizeof(uword));
}
}
void FlowGraphCompiler::FinalizePcDescriptors(const Code& code) {
ASSERT(pc_descriptors_list_ != NULL);
const PcDescriptors& descriptors = PcDescriptors::Handle(
pc_descriptors_list_->FinalizePcDescriptors(code.PayloadStart()));
if (!is_optimizing_) descriptors.Verify(parsed_function_.function());
code.set_pc_descriptors(descriptors);
}
RawArray* FlowGraphCompiler::CreateDeoptInfo(Assembler* assembler) {
// No deopt information if we precompile (no deoptimization allowed).
if (FLAG_precompiled_mode) {
return Array::empty_array().raw();
}
// For functions with optional arguments, all incoming arguments are copied
// to spill slots. The deoptimization environment does not track them.
const Function& function = parsed_function().function();
const intptr_t incoming_arg_count =
function.HasOptionalParameters() ? 0 : function.num_fixed_parameters();
DeoptInfoBuilder builder(zone(), incoming_arg_count, assembler);
intptr_t deopt_info_table_size = DeoptTable::SizeFor(deopt_infos_.length());
if (deopt_info_table_size == 0) {
return Object::empty_array().raw();
} else {
const Array& array =
Array::Handle(Array::New(deopt_info_table_size, Heap::kOld));
Smi& offset = Smi::Handle();
TypedData& info = TypedData::Handle();
Smi& reason_and_flags = Smi::Handle();
for (intptr_t i = 0; i < deopt_infos_.length(); i++) {
offset = Smi::New(deopt_infos_[i]->pc_offset());
info = deopt_infos_[i]->CreateDeoptInfo(this, &builder, array);
reason_and_flags = DeoptTable::EncodeReasonAndFlags(
deopt_infos_[i]->reason(), deopt_infos_[i]->flags());
DeoptTable::SetEntry(array, i, offset, info, reason_and_flags);
}
return array.raw();
}
}
void FlowGraphCompiler::FinalizeStackMaps(const Code& code) {
if (stackmap_table_builder_ == NULL) {
code.set_stackmaps(Object::null_array());
} else {
// Finalize the stack map array and add it to the code object.
code.set_stackmaps(
Array::Handle(stackmap_table_builder_->FinalizeStackMaps(code)));
}
}
void FlowGraphCompiler::FinalizeVarDescriptors(const Code& code) {
if (code.is_optimized()) {
// Optimized code does not need variable descriptors. They are
// only stored in the unoptimized version.
code.set_var_descriptors(Object::empty_var_descriptors());
return;
}
LocalVarDescriptors& var_descs = LocalVarDescriptors::Handle();
if (parsed_function().node_sequence() == NULL) {
// Eager local var descriptors computation for Irregexp function as it is
// complicated to factor out.
// TODO(srdjan): Consider canonicalizing and reusing the local var
// descriptor for IrregexpFunction.
ASSERT(flow_graph().IsIrregexpFunction());
var_descs = LocalVarDescriptors::New(1);
RawLocalVarDescriptors::VarInfo info;
info.set_kind(RawLocalVarDescriptors::kSavedCurrentContext);
info.scope_id = 0;
info.begin_pos = TokenPosition::kMinSource;
info.end_pos = TokenPosition::kMinSource;
info.set_index(
FrameSlotForVariable(parsed_function().current_context_var()));
var_descs.SetVar(0, Symbols::CurrentContextVar(), &info);
}
code.set_var_descriptors(var_descs);
}
void FlowGraphCompiler::FinalizeCatchEntryStateMap(const Code& code) {
#if defined(DART_PRECOMPILED_RUNTIME) || defined(DART_PRECOMPILER)
TypedData& maps = TypedData::Handle(
catch_entry_state_maps_builder_->FinalizeCatchEntryStateMap());
code.set_catch_entry_state_maps(maps);
#else
code.set_variables(Smi::Handle(Smi::New(flow_graph().variable_count())));
#endif
}
void FlowGraphCompiler::FinalizeStaticCallTargetsTable(const Code& code) {
ASSERT(code.static_calls_target_table() == Array::null());
const Array& targets =
Array::Handle(zone(), Array::New((static_calls_target_table_.length() *
Code::kSCallTableEntryLength),
Heap::kOld));
Smi& smi_offset = Smi::Handle(zone());
for (intptr_t i = 0; i < static_calls_target_table_.length(); i++) {
const intptr_t target_ix = Code::kSCallTableEntryLength * i;
smi_offset = Smi::New(static_calls_target_table_[i]->offset);
targets.SetAt(target_ix + Code::kSCallTableOffsetEntry, smi_offset);
if (static_calls_target_table_[i]->function != NULL) {
targets.SetAt(target_ix + Code::kSCallTableFunctionEntry,
*static_calls_target_table_[i]->function);
}
if (static_calls_target_table_[i]->code != NULL) {
targets.SetAt(target_ix + Code::kSCallTableCodeEntry,
*static_calls_target_table_[i]->code);
}
}
code.set_static_calls_target_table(targets);
INC_STAT(Thread::Current(), total_code_size,
targets.Length() * sizeof(uword));
}
void FlowGraphCompiler::FinalizeCodeSourceMap(const Code& code) {
const Array& inlined_id_array =
Array::Handle(zone(), code_source_map_builder_->InliningIdToFunction());
INC_STAT(Thread::Current(), total_code_size,
inlined_id_array.Length() * sizeof(uword));
code.set_inlined_id_to_function(inlined_id_array);
const CodeSourceMap& map =
CodeSourceMap::Handle(code_source_map_builder_->Finalize());
INC_STAT(Thread::Current(), total_code_size, map.Length() * sizeof(uint8_t));
code.set_code_source_map(map);
#if defined(DEBUG)