From 8b471e7e7961f0a2c898a009d053eb13822a2113 Mon Sep 17 00:00:00 2001
From: drh <drh@noemail.net>
Date: Wed, 28 Jun 2017 15:01:35 +0000
Subject: [PATCH] Faster parser stack overflow detection.

FossilOrigin-Name: 36e54cd8b1fb374fd41e3e09b34b86e34327bf07c9e4bfec58382163c5c5d279
---
 manifest      | 12 ++++++------
 manifest.uuid |  2 +-
 tool/lempar.c |  6 ++++--
 3 files changed, 11 insertions(+), 9 deletions(-)

diff --git a/manifest b/manifest
index 4370c5292a..d205da7170 100644
--- a/manifest
+++ b/manifest
@@ -1,5 +1,5 @@
-C Minor\stweak\sto\sthe\sSQL\sgrammar\sto\smake\sthe\sparser\stables\sa\sfew\sbytes\ssmaller.
-D 2017-06-28T14:26:37.622
+C Faster\sparser\sstack\soverflow\sdetection.
+D 2017-06-28T15:01:35.715
 F Makefile.in 1cc758ce3374a32425e4d130c2fe7b026b20de5b8843243de75f087c0a2661fb
 F Makefile.linux-gcc 7bc79876b875010e8c8f9502eb935ca92aa3c434
 F Makefile.msc 8eeb80162074004e906b53d7340a12a14c471a83743aab975947e95ce061efcc
@@ -1510,7 +1510,7 @@ F tool/genfkey.test 4196a8928b78f51d54ef58e99e99401ab2f0a7e5
 F tool/getlock.c f4c39b651370156cae979501a7b156bdba50e7ce
 F tool/kvtest-speed.sh 4761a9c4b3530907562314d7757995787f7aef8f
 F tool/lemon.c 5a04dff28578a67415cea5bf981b893c50cebfdd4388fb21254d1892525edfd8
-F tool/lempar.c 1653b07079a7b4c0eabe6cde5e354013da3cf4de30947d0dc00d045be1e2c9a1
+F tool/lempar.c f0dc07c2838febff4c34244651a6932fceb523065e6fe79bacfaa93019cc8cca
 F tool/libvers.c caafc3b689638a1d88d44bc5f526c2278760d9b9
 F tool/loadfts.c c3c64e4d5e90e8ba41159232c2189dba4be7b862
 F tool/logest.c 11346aa019e2e77a00902aa7d0cabd27bd2e8cca
@@ -1584,7 +1584,7 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
 F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
 F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
 F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
-P b362f0d8ed34839bf3b29d10ed0853ab94245fba135ccd28e619caa6ee6992d5
-R 47fe456950b93480334e354c250c0848
+P cc4810b23e683e8c359f7c1a562338ec8501e43cac3475b2be002568fca5e6a4
+R aecb52c4ffe19d7ddc13e13ae7717a64
 U drh
-Z 983cf2b86c0c77a70c157e39be586b00
+Z deaa1ad68fb12d39469a0630e4b55aa7
diff --git a/manifest.uuid b/manifest.uuid
index ff73f3fd14..f6a85fd8bf 100644
--- a/manifest.uuid
+++ b/manifest.uuid
@@ -1 +1 @@
-cc4810b23e683e8c359f7c1a562338ec8501e43cac3475b2be002568fca5e6a4
\ No newline at end of file
+36e54cd8b1fb374fd41e3e09b34b86e34327bf07c9e4bfec58382163c5c5d279
\ No newline at end of file
diff --git a/tool/lempar.c b/tool/lempar.c
index 51adf672b3..4a98d23700 100644
--- a/tool/lempar.c
+++ b/tool/lempar.c
@@ -221,6 +221,7 @@ struct yyParser {
   yyStackEntry yystk0;          /* First stack entry */
 #else
   yyStackEntry yystack[YYSTACKDEPTH];  /* The parser's stack */
+  yyStackEntry *yystackEnd;            /* Last entry in the stack */
 #endif
 };
 typedef struct yyParser yyParser;
@@ -338,6 +339,7 @@ void ParseInit(void *yypParser){
   pParser->yytos = pParser->yystack;
   pParser->yystack[0].stateno = 0;
   pParser->yystack[0].major = 0;
+  pParser->yystackEnd = &pParser->yystack[YYSTACKDEPTH-1];
 }
 
 #ifndef Parse_ENGINEALWAYSONSTACK
@@ -607,7 +609,7 @@ static void yy_shift(
   }
 #endif
 #if YYSTACKDEPTH>0 
-  if( yypParser->yytos>=&yypParser->yystack[YYSTACKDEPTH] ){
+  if( yypParser->yytos>yypParser->yystackEnd ){
     yypParser->yytos--;
     yyStackOverflow(yypParser);
     return;
@@ -676,7 +678,7 @@ static void yy_reduce(
     }
 #endif
 #if YYSTACKDEPTH>0 
-    if( yypParser->yytos>=&yypParser->yystack[YYSTACKDEPTH-1] ){
+    if( yypParser->yytos>=yypParser->yystackEnd ){
       yyStackOverflow(yypParser);
       return;
     }