/
parser_literalbuffer_expandbuffer_always_grows.patch
49 lines (43 loc) · 2.07 KB
/
parser_literalbuffer_expandbuffer_always_grows.patch
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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Toon Verwaest <verwaest@chromium.org>
Date: Fri, 11 Jan 2019 11:27:18 +0100
Subject: [parser] LiteralBuffer::ExpandBuffer always grows
Bug: chromium:914736
Change-Id: Id02715b69361d15df23c70f85f3250526369547f
Reviewed-on: https://chromium-review.googlesource.com/c/1405859
Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Commit-Queue: Toon Verwaest <verwaest@chromium.org>
Cr-Commit-Position: refs/heads/master@{#58734}
diff --git a/src/parsing/scanner.cc b/src/parsing/scanner.cc
index 852b5e400b3ffe84e464a2d63c943a30b497ac69..267b38fd7fed38421b9b6e315b02771dbab9381f 100644
--- a/src/parsing/scanner.cc
+++ b/src/parsing/scanner.cc
@@ -67,13 +67,14 @@ Handle<String> Scanner::LiteralBuffer::Internalize(Isolate* isolate) const {
}
int Scanner::LiteralBuffer::NewCapacity(int min_capacity) {
- int capacity = Max(min_capacity, backing_store_.length());
- int new_capacity = Min(capacity * kGrowthFactory, capacity + kMaxGrowth);
- return new_capacity;
+ return min_capacity < (kMaxGrowth / (kGrowthFactor - 1))
+ ? min_capacity * kGrowthFactor
+ : min_capacity + kMaxGrowth;
}
void Scanner::LiteralBuffer::ExpandBuffer() {
- Vector<byte> new_store = Vector<byte>::New(NewCapacity(kInitialCapacity));
+ int min_capacity = Max(kInitialCapacity, backing_store_.length());
+ Vector<byte> new_store = Vector<byte>::New(NewCapacity(min_capacity));
MemCopy(new_store.start(), backing_store_.start(), position_);
backing_store_.Dispose();
backing_store_ = new_store;
diff --git a/src/parsing/scanner.h b/src/parsing/scanner.h
index 34da5fafbf733fd326e91baeeac26bf4517c9fcf..d779317c55567311dc266af101815d2740d28e0b 100644
--- a/src/parsing/scanner.h
+++ b/src/parsing/scanner.h
@@ -453,8 +453,7 @@ class Scanner {
private:
static const int kInitialCapacity = 16;
- static const int kGrowthFactory = 4;
- static const int kMinConversionSlack = 256;
+ static const int kGrowthFactor = 4;
static const int kMaxGrowth = 1 * MB;
inline bool IsValidAscii(char code_unit) {