From: Brian Demsky <bdemsky@uci.edu>
Date: Thu, 15 Nov 2012 02:15:04 +0000 (-0800)
Subject: merge
X-Git-Tag: oopsla2013~539^2
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=45206350b4022732229f8a48a3c7b08885e874a7;hp=4bb070b43345c8617c6c627e2b9b24039affb6b7;p=model-checker.git

merge
Merge branch 'master' of ssh://demsky.eecs.uci.edu/home/git/model-checker

Conflicts:
	config.h
	model.cc
---

diff --git a/config.h b/config.h
index e064e39..aacbb81 100644
--- a/config.h
+++ b/config.h
@@ -48,6 +48,9 @@
 /* Size of stack to allocate for a thread. */
 #define STACK_SIZE (1024 * 1024)
 
+/** How many shadow tables of memory to preallocate for data race detector. */
+#define SHADOWBASETABLES 4
+
 /** Enable debugging assertions (via ASSERT()) */
 #define CONFIG_ASSERT
 
diff --git a/datarace.cc b/datarace.cc
index e6bbe05..ac364d7 100644
--- a/datarace.cc
+++ b/datarace.cc
@@ -5,13 +5,29 @@
 #include <cstring>
 #include "mymemory.h"
 #include "clockvector.h"
+#include "config.h"
 
 struct ShadowTable *root;
 std::vector<struct DataRace *> unrealizedraces;
+void *memory_base;
+void *memory_top;
+
 
 /** This function initialized the data race detector. */
 void initRaceDetector() {
 	root = (struct ShadowTable *)snapshot_calloc(sizeof(struct ShadowTable), 1);
+	memory_base = snapshot_calloc(sizeof(struct ShadowBaseTable)*SHADOWBASETABLES, 1);
+	memory_top = ((char *)memory_base) + sizeof(struct ShadowBaseTable)*SHADOWBASETABLES;
+}
+
+void * table_calloc(size_t size) {
+	if ((((char *)memory_base)+size)>memory_top) {
+		return snapshot_calloc(size, 1);
+	} else {
+		void *tmp=memory_base;
+		memory_base=((char *)memory_base)+size;
+		return tmp;
+	}
 }
 
 /** This function looks up the entry in the shadow table corresponding to a
@@ -21,13 +37,13 @@ static uint64_t * lookupAddressEntry(const void * address) {
 #if BIT48
 	currtable=(struct ShadowTable *) currtable->array[(((uintptr_t)address)>>32)&MASK16BIT];
 	if (currtable==NULL) {
-		currtable = (struct ShadowTable *)(root->array[(((uintptr_t)address)>>32)&MASK16BIT] = snapshot_calloc(sizeof(struct ShadowTable), 1));
+		currtable = (struct ShadowTable *)(root->array[(((uintptr_t)address)>>32)&MASK16BIT] = table_calloc(sizeof(struct ShadowTable)));
 	}
 #endif
 
 	struct ShadowBaseTable * basetable=(struct ShadowBaseTable *) currtable->array[(((uintptr_t)address)>>16)&MASK16BIT];
 	if (basetable==NULL) {
-		basetable = (struct ShadowBaseTable *)(currtable->array[(((uintptr_t)address)>>16)&MASK16BIT] = snapshot_calloc(sizeof(struct ShadowBaseTable), 1));
+		basetable = (struct ShadowBaseTable *)(currtable->array[(((uintptr_t)address)>>16)&MASK16BIT] = table_calloc(sizeof(struct ShadowBaseTable)));
 	}
 	return &basetable->array[((uintptr_t)address)&MASK16BIT];
 }