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[regexp] Skip result construction in test, @@match, @@search

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We can skip RegExpResult construction on the fast path for several functions to
be more efficient.

BUG=v8:5330,v8:5674

Review-Url: https://codereview.chromium.org/2543483003
Cr-Commit-Position: refs/heads/master@{#41418}
This commit is contained in:
jgruber 2016-12-01 02:29:20 -08:00 committed by Commit bot
parent fce55b528f
commit 360b7668ea
1 changed files with 143 additions and 118 deletions
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261
src/builtins/builtins-regexp.cc
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@ -226,22 +226,26 @@ void StoreLastIndex(CodeStubAssembler* a, Node* context, Node* regexp,
}
}
Node* LoadMatchInfoField(CodeStubAssembler* a, Node* const match_info,
const int index) {
const ParameterMode mode = CodeStubAssembler::INTPTR_PARAMETERS;
Node* const result =
a->LoadFixedArrayElement(match_info, a->IntPtrConstant(index), 0, mode);
return result;
}
Node* ConstructNewResultFromMatchInfo(Isolate* isolate, CodeStubAssembler* a,
Node* context, Node* match_info,
Node* string) {
CLabel out(a);
ParameterMode mode = CodeStubAssembler::INTPTR_PARAMETERS;
Node* const num_indices = a->SmiUntag(a->LoadFixedArrayElement(
match_info, a->IntPtrConstant(RegExpMatchInfo::kNumberOfCapturesIndex), 0,
mode));
Node* const num_indices = a->SmiUntag(LoadMatchInfoField(
a, match_info, RegExpMatchInfo::kNumberOfCapturesIndex));
Node* const num_results = a->SmiTag(a->WordShr(num_indices, 1));
Node* const start = a->LoadFixedArrayElement(
match_info, a->IntPtrConstant(RegExpMatchInfo::kFirstCaptureIndex), 0,
mode);
Node* const end = a->LoadFixedArrayElement(
match_info, a->IntPtrConstant(RegExpMatchInfo::kFirstCaptureIndex + 1), 0,
mode);
Node* const start =
LoadMatchInfoField(a, match_info, RegExpMatchInfo::kFirstCaptureIndex);
Node* const end = LoadMatchInfoField(a, match_info,
RegExpMatchInfo::kFirstCaptureIndex + 1);
// Calculate the substring of the first match before creating the result array
// to avoid an unnecessary write barrier storing the first result.
@ -416,9 +420,8 @@ Node* RegExpPrototypeExecBodyWithoutResult(
a->GotoUnless(should_update_last_index, &out);
// Update the new last index from {match_indices}.
Node* const new_lastindex = a->LoadFixedArrayElement(
match_indices,
a->IntPtrConstant(RegExpMatchInfo::kFirstCaptureIndex + 1));
Node* const new_lastindex = LoadMatchInfoField(
a, match_indices, RegExpMatchInfo::kFirstCaptureIndex + 1);
StoreLastIndex(a, context, regexp, new_lastindex, is_fastpath);
a->Goto(&out);
@ -461,10 +464,6 @@ Node* RegExpPrototypeExecBody(CodeStubAssembler* a, Node* const context,
return var_result.value();
}
} // namespace
namespace {
Node* ThrowIfNotJSReceiver(CodeStubAssembler* a, Isolate* isolate,
Node* context, Node* value,
MessageTemplate::Template msg_template,
@ -1135,21 +1134,38 @@ void Builtins::Generate_RegExpPrototypeTest(CodeAssemblerState* state) {
Node* const context = a.Parameter(4);
// Ensure {maybe_receiver} is a JSReceiver.
ThrowIfNotJSReceiver(&a, isolate, context, maybe_receiver,
MessageTemplate::kIncompatibleMethodReceiver,
"RegExp.prototype.test");
Node* const map = ThrowIfNotJSReceiver(
&a, isolate, context, maybe_receiver,
MessageTemplate::kIncompatibleMethodReceiver, "RegExp.prototype.test");
Node* const receiver = maybe_receiver;
// Convert {maybe_string} to a String.
Node* const string = a.ToString(context, maybe_string);
// Call exec.
Node* const match_indices = RegExpExec(&a, context, receiver, string);
CLabel fast_path(&a), slow_path(&a);
BranchIfFastPath(&a, context, map, &fast_path, &slow_path);
// Return true iff exec matched successfully.
Node* const result = a.Select(a.WordEqual(match_indices, a.NullConstant()),
a.FalseConstant(), a.TrueConstant());
a.Return(result);
a.Bind(&fast_path);
{
CLabel if_didnotmatch(&a);
RegExpPrototypeExecBodyWithoutResult(&a, context, receiver, string,
&if_didnotmatch, true);
a.Return(a.TrueConstant());
a.Bind(&if_didnotmatch);
a.Return(a.FalseConstant());
}
a.Bind(&slow_path);
{
// Call exec.
Node* const match_indices = RegExpExec(&a, context, receiver, string);
// Return true iff exec matched successfully.
Node* const result = a.Select(a.WordEqual(match_indices, a.NullConstant()),
a.FalseConstant(), a.TrueConstant());
a.Return(result);
}
}
namespace {
@ -1319,10 +1335,9 @@ class GrowableFixedArray {
CVariable var_capacity_;
};
void Generate_RegExpPrototypeMatchBody(CodeStubAssembler* a,
Node* const receiver, Node* const string,
Node* const context,
const bool is_fastpath) {
void RegExpPrototypeMatchBody(CodeStubAssembler* a, Node* const receiver,
Node* const string, Node* const context,
const bool is_fastpath) {
Isolate* const isolate = a->isolate();
Node* const null = a->NullConstant();
@ -1365,45 +1380,39 @@ void Generate_RegExpPrototypeMatchBody(CodeStubAssembler* a,
a->Bind(&loop);
{
Node* const result = is_fastpath ? RegExpPrototypeExecBody(
a, context, regexp, string, true)
: RegExpExec(a, context, regexp, string);
CVariable var_match(a, MachineRepresentation::kTagged);
CLabel if_didmatch(a), if_didnotmatch(a);
a->Branch(a->WordEqual(result, null), &if_didnotmatch, &if_didmatch);
if (is_fastpath) {
// On the fast path, grab the matching string from the raw match index
// array.
Node* const match_indices = RegExpPrototypeExecBodyWithoutResult(
a, context, regexp, string, &if_didnotmatch, true);
a->Bind(&if_didnotmatch);
{
// Return null if there were no matches, otherwise just exit the loop.
a->GotoUnless(a->IntPtrEqual(array.length(), int_zero), &out);
a->Return(null);
}
Node* const match_from = LoadMatchInfoField(
a, match_indices, RegExpMatchInfo::kFirstCaptureIndex);
Node* const match_to = LoadMatchInfoField(
a, match_indices, RegExpMatchInfo::kFirstCaptureIndex + 1);
a->Bind(&if_didmatch);
{
Node* match = nullptr;
if (is_fastpath) {
// TODO(jgruber): We could optimize further here and in other
// methods (e.g. @@search) by bypassing RegExp result construction.
Node* const result_fixed_array = a->LoadElements(result);
const ParameterMode mode = CodeStubAssembler::INTPTR_PARAMETERS;
match =
a->LoadFixedArrayElement(result_fixed_array, int_zero, 0, mode);
Node* match = a->SubString(context, string, match_from, match_to);
var_match.Bind(match);
// The match is guaranteed to be a string on the fast path.
CSA_ASSERT(a, a->IsStringInstanceType(a->LoadInstanceType(match)));
} else {
DCHECK(!is_fastpath);
a->Goto(&if_didmatch);
} else {
DCHECK(!is_fastpath);
Node* const result = RegExpExec(a, context, regexp, string);
CVariable var_match(a, MachineRepresentation::kTagged);
CLabel fast_result(a), slow_result(a), match_loaded(a);
CLabel load_match(a);
a->Branch(a->WordEqual(result, null), &if_didnotmatch, &load_match);
a->Bind(&load_match);
{
CLabel fast_result(a), slow_result(a);
BranchIfFastRegExpResult(a, context, a->LoadMap(result), &fast_result,
&slow_result);
a->Bind(&fast_result);
{
// TODO(jgruber): We could optimize further here and in other
// methods (e.g. @@search) by bypassing RegExp result construction.
Node* const result_fixed_array = a->LoadElements(result);
const ParameterMode mode = CodeStubAssembler::INTPTR_PARAMETERS;
Node* const match =
@ -1413,7 +1422,7 @@ void Generate_RegExpPrototypeMatchBody(CodeStubAssembler* a,
CSA_ASSERT(a, a->IsStringInstanceType(a->LoadInstanceType(match)));
var_match.Bind(match);
a->Goto(&match_loaded);
a->Goto(&if_didmatch);
}
a->Bind(&slow_result);
@ -1424,14 +1433,22 @@ void Generate_RegExpPrototypeMatchBody(CodeStubAssembler* a,
Node* const match =
a->CallStub(getproperty_callable, context, result, name);
var_match.Bind(match);
a->Goto(&match_loaded);
var_match.Bind(a->ToString(context, match));
a->Goto(&if_didmatch);
}
a->Bind(&match_loaded);
match = a->ToString(context, var_match.value());
}
DCHECK(match != nullptr);
}
a->Bind(&if_didnotmatch);
{
// Return null if there were no matches, otherwise just exit the loop.
a->GotoUnless(a->IntPtrEqual(array.length(), int_zero), &out);
a->Return(null);
}
a->Bind(&if_didmatch);
{
Node* match = var_match.value();
// Store the match, growing the fixed array if needed.
@ -1490,30 +1507,57 @@ void Builtins::Generate_RegExpPrototypeMatch(CodeAssemblerState* state) {
BranchIfFastPath(&a, context, map, &fast_path, &slow_path);
a.Bind(&fast_path);
Generate_RegExpPrototypeMatchBody(&a, receiver, string, context, true);
RegExpPrototypeMatchBody(&a, receiver, string, context, true);
a.Bind(&slow_path);
Generate_RegExpPrototypeMatchBody(&a, receiver, string, context, false);
RegExpPrototypeMatchBody(&a, receiver, string, context, false);
}
namespace {
void Generate_RegExpPrototypeSearchBody(CodeStubAssembler* a,
Node* const receiver,
Node* const string, Node* const context,
bool is_fastpath) {
void RegExpPrototypeSearchBodyFast(CodeStubAssembler* a, Node* const receiver,
Node* const string, Node* const context) {
// Grab the initial value of last index.
Node* const previous_last_index = FastLoadLastIndex(a, receiver);
// Ensure last index is 0.
FastStoreLastIndex(a, receiver, a->SmiConstant(Smi::kZero));
// Call exec.
CLabel if_didnotmatch(a);
Node* const match_indices = RegExpPrototypeExecBodyWithoutResult(
a, context, receiver, string, &if_didnotmatch, true);
// Successful match.
{
// Reset last index.
FastStoreLastIndex(a, receiver, previous_last_index);
// Return the index of the match.
Node* const index = LoadMatchInfoField(a, match_indices,
RegExpMatchInfo::kFirstCaptureIndex);
a->Return(index);
}
a->Bind(&if_didnotmatch);
{
// Reset last index and return -1.
FastStoreLastIndex(a, receiver, previous_last_index);
a->Return(a->SmiConstant(-1));
}
}
void RegExpPrototypeSearchBodySlow(CodeStubAssembler* a, Node* const receiver,
Node* const string, Node* const context) {
Isolate* const isolate = a->isolate();
Node* const smi_zero = a->SmiConstant(Smi::kZero);
// Grab the initial value of last index.
Node* const previous_last_index =
LoadLastIndex(a, context, receiver, is_fastpath);
Node* const previous_last_index = SlowLoadLastIndex(a, context, receiver);
// Ensure last index is 0.
if (is_fastpath) {
FastStoreLastIndex(a, receiver, smi_zero);
} else {
{
CLabel next(a);
a->GotoIf(a->SameValue(previous_last_index, smi_zero, context), &next);
@ -1523,14 +1567,10 @@ void Generate_RegExpPrototypeSearchBody(CodeStubAssembler* a,
}
// Call exec.
Node* const match_indices =
is_fastpath ? RegExpPrototypeExecBody(a, context, receiver, string, true)
: RegExpExec(a, context, receiver, string);
Node* const exec_result = RegExpExec(a, context, receiver, string);
// Reset last index if necessary.
if (is_fastpath) {
FastStoreLastIndex(a, receiver, previous_last_index);
} else {
{
CLabel next(a);
Node* const current_last_index = SlowLoadLastIndex(a, context, receiver);
@ -1539,34 +1579,28 @@ void Generate_RegExpPrototypeSearchBody(CodeStubAssembler* a,
SlowStoreLastIndex(a, context, receiver, previous_last_index);
a->Goto(&next);
a->Bind(&next);
}
// Return -1 if no match was found.
{
CLabel next(a);
a->GotoUnless(a->WordEqual(match_indices, a->NullConstant()), &next);
a->GotoUnless(a->WordEqual(exec_result, a->NullConstant()), &next);
a->Return(a->SmiConstant(-1));
a->Bind(&next);
}
// Return the index of the match.
if (is_fastpath) {
Node* const index = a->LoadObjectField(
match_indices, JSRegExpResult::kIndexOffset, MachineType::AnyTagged());
a->Return(index);
} else {
DCHECK(!is_fastpath);
{
CLabel fast_result(a), slow_result(a, CLabel::kDeferred);
BranchIfFastRegExpResult(a, context, a->LoadMap(match_indices),
&fast_result, &slow_result);
BranchIfFastRegExpResult(a, context, a->LoadMap(exec_result), &fast_result,
&slow_result);
a->Bind(&fast_result);
{
Node* const index =
a->LoadObjectField(match_indices, JSRegExpResult::kIndexOffset,
MachineType::AnyTagged());
a->LoadObjectField(exec_result, JSRegExpResult::kIndexOffset);
a->Return(index);
}
@ -1575,7 +1609,7 @@ void Generate_RegExpPrototypeSearchBody(CodeStubAssembler* a,
Node* const name = a->HeapConstant(isolate->factory()->index_string());
Callable getproperty_callable = CodeFactory::GetProperty(a->isolate());
Node* const index =
a->CallStub(getproperty_callable, context, match_indices, name);
a->CallStub(getproperty_callable, context, exec_result, name);
a->Return(index);
}
}
@ -1608,10 +1642,10 @@ void Builtins::Generate_RegExpPrototypeSearch(CodeAssemblerState* state) {
BranchIfFastPath(&a, context, map, &fast_path, &slow_path);
a.Bind(&fast_path);
Generate_RegExpPrototypeSearchBody(&a, receiver, string, context, true);
RegExpPrototypeSearchBodyFast(&a, receiver, string, context);
a.Bind(&slow_path);
Generate_RegExpPrototypeSearchBody(&a, receiver, string, context, false);
RegExpPrototypeSearchBodySlow(&a, receiver, string, context);
}
namespace {
@ -1729,9 +1763,8 @@ void Generate_RegExpPrototypeSplitBody(CodeStubAssembler* a, Node* const regexp,
a->Bind(&next);
}
Node* const match_from = a->LoadFixedArrayElement(
match_indices, a->IntPtrConstant(RegExpMatchInfo::kFirstCaptureIndex),
0, mode);
Node* const match_from = LoadMatchInfoField(
a, match_indices, RegExpMatchInfo::kFirstCaptureIndex);
// We're done if the match starts beyond the string.
{
@ -1741,9 +1774,8 @@ void Generate_RegExpPrototypeSplitBody(CodeStubAssembler* a, Node* const regexp,
a->Bind(&next);
}
Node* const match_to = a->LoadFixedArrayElement(
match_indices,
a->IntPtrConstant(RegExpMatchInfo::kFirstCaptureIndex + 1), 0, mode);
Node* const match_to = LoadMatchInfoField(
a, match_indices, RegExpMatchInfo::kFirstCaptureIndex + 1);
// Advance index and continue if the match is empty.
{
@ -1774,9 +1806,8 @@ void Generate_RegExpPrototypeSplitBody(CodeStubAssembler* a, Node* const regexp,
// Add all captures to the array.
{
Node* const num_registers = a->LoadFixedArrayElement(
match_indices,
a->IntPtrConstant(RegExpMatchInfo::kNumberOfCapturesIndex), 0, mode);
Node* const num_registers = LoadMatchInfoField(
a, match_indices, RegExpMatchInfo::kNumberOfCapturesIndex);
Node* const int_num_registers = a->SmiUntag(num_registers);
CVariable var_reg(a, MachineType::PointerRepresentation());
@ -1994,10 +2025,8 @@ Node* ReplaceGlobalCallableFastPath(CodeStubAssembler* a, Node* context,
Node* const res_elems = a->LoadElements(res);
CSA_ASSERT(a, a->HasInstanceType(res_elems, FIXED_ARRAY_TYPE));
ParameterMode mode = CodeStubAssembler::INTPTR_PARAMETERS;
Node* const num_capture_registers = a->LoadFixedArrayElement(
last_match_info,
a->IntPtrConstant(RegExpMatchInfo::kNumberOfCapturesIndex), 0, mode);
Node* const num_capture_registers = LoadMatchInfoField(
a, last_match_info, RegExpMatchInfo::kNumberOfCapturesIndex);
CLabel if_hasexplicitcaptures(a), if_noexplicitcaptures(a), create_result(a);
a->Branch(a->SmiEqual(num_capture_registers, a->SmiConstant(Smi::FromInt(2))),
@ -2211,15 +2240,11 @@ Node* ReplaceSimpleStringFastPath(CodeStubAssembler* a, Node* context,
a->Bind(&if_matched);
{
ParameterMode mode = CodeStubAssembler::INTPTR_PARAMETERS;
Node* const subject_start = smi_zero;
Node* const match_start = a->LoadFixedArrayElement(
match_indices, a->IntPtrConstant(RegExpMatchInfo::kFirstCaptureIndex),
0, mode);
Node* const match_end = a->LoadFixedArrayElement(
match_indices,
a->IntPtrConstant(RegExpMatchInfo::kFirstCaptureIndex + 1), 0, mode);
Node* const match_start = LoadMatchInfoField(
a, match_indices, RegExpMatchInfo::kFirstCaptureIndex);
Node* const match_end = LoadMatchInfoField(
a, match_indices, RegExpMatchInfo::kFirstCaptureIndex + 1);
Node* const subject_end = a->LoadStringLength(subject_string);
CLabel if_replaceisempty(a), if_replaceisnotempty(a);