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-rw-r--r--js/src/builtin/RegExpLocalReplaceOpt.h.js36
1 files changed, 28 insertions, 8 deletions
diff --git a/js/src/builtin/RegExpLocalReplaceOpt.h.js b/js/src/builtin/RegExpLocalReplaceOpt.h.js
index edc2e2056..1acd6a73a 100644
--- a/js/src/builtin/RegExpLocalReplaceOpt.h.js
+++ b/js/src/builtin/RegExpLocalReplaceOpt.h.js
@@ -11,24 +11,39 @@
// * FUNCTIONAL -- replaceValue is a function
// * neither of above -- replaceValue is a string without "$"
-// ES 2017 draft 03bfda119d060aca4099d2b77cf43f6d4f11cfa2 21.2.5.8
+// ES 2017 draft 6390c2f1b34b309895d31d8c0512eac8660a0210 21.2.5.8
// steps 11.a-16.
// Optimized path for @@replace with the following conditions:
// * global flag is false
-function FUNC_NAME(rx, S, lengthS, replaceValue, sticky
+function FUNC_NAME(rx, S, lengthS, replaceValue
#ifdef SUBSTITUTION
, firstDollarIndex
#endif
)
{
- var lastIndex;
- if (sticky) {
- lastIndex = ToLength(rx.lastIndex);
+ // 21.2.5.2.2 RegExpBuiltinExec, step 4.
+ var lastIndex = ToLength(rx.lastIndex);
+
+ // 21.2.5.2.2 RegExpBuiltinExec, step 5.
+ // Side-effects in step 4 can recompile the RegExp, so we need to read the
+ // flags again and handle the case when global was enabled even though this
+ // function is optimized for non-global RegExps.
+ var flags = UnsafeGetInt32FromReservedSlot(rx, REGEXP_FLAGS_SLOT);
+
+ // 21.2.5.2.2 RegExpBuiltinExec, steps 6-7.
+ var globalOrSticky = !!(flags & (REGEXP_GLOBAL_FLAG | REGEXP_STICKY_FLAG));
+
+ if (globalOrSticky) {
+ // 21.2.5.2.2 RegExpBuiltinExec, step 12.a.
if (lastIndex > lengthS) {
- rx.lastIndex = 0;
+ if (globalOrSticky)
+ rx.lastIndex = 0;
+
+ // Steps 12-16.
return S;
}
} else {
+ // 21.2.5.2.2 RegExpBuiltinExec, step 8.
lastIndex = 0;
}
@@ -37,7 +52,11 @@ function FUNC_NAME(rx, S, lengthS, replaceValue, sticky
// Step 11.b.
if (result === null) {
- rx.lastIndex = 0;
+ // 21.2.5.2.2 RegExpBuiltinExec, steps 12.a.i, 12.c.i.
+ if (globalOrSticky)
+ rx.lastIndex = 0;
+
+ // Steps 12-16.
return S;
}
@@ -61,7 +80,8 @@ function FUNC_NAME(rx, S, lengthS, replaceValue, sticky
// To set rx.lastIndex before RegExpGetComplexReplacement.
var nextSourcePosition = position + matchLength;
- if (sticky)
+ // 21.2.5.2.2 RegExpBuiltinExec, step 15.
+ if (globalOrSticky)
rx.lastIndex = nextSourcePosition;
var replacement;