From 6882a04fb36642862b11efe514251d32070c3d65 Mon Sep 17 00:00:00 2001 From: Konstantin Tokarev Date: Thu, 25 Aug 2016 19:20:41 +0300 Subject: Imported QtWebKit TP3 (git b57bc6801f1876c3220d5a4bfea33d620d477443) Change-Id: I3b1d8a2808782c9f34d50240000e20cb38d3680f Reviewed-by: Konstantin Tokarev --- Source/JavaScriptCore/runtime/ArrayConventions.h | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) (limited to 'Source/JavaScriptCore/runtime/ArrayConventions.h') diff --git a/Source/JavaScriptCore/runtime/ArrayConventions.h b/Source/JavaScriptCore/runtime/ArrayConventions.h index e5ef96336..9c62ea9b8 100644 --- a/Source/JavaScriptCore/runtime/ArrayConventions.h +++ b/Source/JavaScriptCore/runtime/ArrayConventions.h @@ -38,7 +38,7 @@ namespace JSC { // (specifically, this is only one property - the value 0xFFFFFFFFU as an unsigned 32-bit // integer) are not considered array indices and will be stored in the JSObject property map. // -// All properties with a numeric identifer, representable as an unsigned integer i, +// All properties with a numeric identifier, representable as an unsigned integer i, // where (i <= MAX_ARRAY_INDEX), are an array index and will be stored in either the // storage vector or the sparse map. An array index i will be handled in the following // fashion: @@ -58,7 +58,14 @@ namespace JSC { // These values have to be macros to be used in max() and min() without introducing // a PIC branch in Mach-O binaries, see . + +// If you grow an ArrayStorage array by more than this, then the array will go sparse. Note that we +// could probably make this smaller (it's large because it used to be conflated with +// MIN_ARRAY_STORAGE_CONSTRUCTION_LENGTH). #define MIN_SPARSE_ARRAY_INDEX 100000U +// If you try to allocate a contiguous array larger than this, then we will allocate an ArrayStorage +// array instead. We allow for an array that occupies 1GB of VM. +#define MIN_ARRAY_STORAGE_CONSTRUCTION_LENGTH 1024 * 1024 * 1024 / 8 #define MAX_STORAGE_VECTOR_INDEX (MAX_STORAGE_VECTOR_LENGTH - 1) // 0xFFFFFFFF is a bit weird -- is not an array index even though it's an integer. #define MAX_ARRAY_INDEX 0xFFFFFFFEU -- cgit v1.2.1