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Bug 1159972 - Remove the fallible version of PL_DHashTableInit(). r=froydnj.

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It's no longer needed now that entry storage isn't allocated there. (The other
possible causes of failures in that function are less interesting and simply
crashing is a reasonable thing to do for them.)

This also makes PL_DNewHashTable() infallible, so I removed some
now-unnecessary checks of its result.
This commit is contained in:
Nicholas Nethercote 2015-04-29 16:38:29 -07:00
parent 0a8851abfc
commit 29a54c9b3b
13 changed files with 45 additions and 172 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
dom/base/nsDocument.cpp
View File

@ -4047,9 +4047,6 @@ nsDocument::SetSubDocumentFor(Element* aElement, nsIDocument* aSubDoc)
};
mSubDocuments = PL_NewDHashTable(&hash_table_ops, sizeof(SubDocMapEntry));
if (!mSubDocuments) {
return NS_ERROR_OUT_OF_MEMORY;
}
}
// Add a mapping to the hash table

20
dom/base/nsScriptNameSpaceManager.cpp
View File

@ -323,21 +323,15 @@ nsScriptNameSpaceManager::Init()
GlobalNameHashInitEntry
};
mIsInitialized = PL_DHashTableInit(&mGlobalNames, &hash_table_ops,
sizeof(GlobalNameMapEntry),
fallible,
GLOBALNAME_HASHTABLE_INITIAL_LENGTH);
NS_ENSURE_TRUE(mIsInitialized, NS_ERROR_OUT_OF_MEMORY);
PL_DHashTableInit(&mGlobalNames, &hash_table_ops,
sizeof(GlobalNameMapEntry),
GLOBALNAME_HASHTABLE_INITIAL_LENGTH);
mIsInitialized = PL_DHashTableInit(&mNavigatorNames, &hash_table_ops,
sizeof(GlobalNameMapEntry),
fallible,
GLOBALNAME_HASHTABLE_INITIAL_LENGTH);
if (!mIsInitialized) {
PL_DHashTableFinish(&mGlobalNames);
PL_DHashTableInit(&mNavigatorNames, &hash_table_ops,
sizeof(GlobalNameMapEntry),
GLOBALNAME_HASHTABLE_INITIAL_LENGTH);
return NS_ERROR_OUT_OF_MEMORY;
}
mIsInitialized = true;
RegisterWeakMemoryReporter(this);

5
dom/xul/XULDocument.cpp
View File

@ -769,11 +769,6 @@ XULDocument::AddBroadcastListenerFor(Element& aBroadcaster, Element& aListener,
if (! mBroadcasterMap) {
mBroadcasterMap = PL_NewDHashTable(&gOps, sizeof(BroadcasterMapEntry));
if (! mBroadcasterMap) {
aRv.Throw(NS_ERROR_OUT_OF_MEMORY);
return;
}
}
BroadcasterMapEntry* entry =

2
layout/style/nsRuleNode.cpp
View File

@ -1617,8 +1617,6 @@ nsRuleNode::ConvertChildrenToHash(int32_t aNumKids)
PLDHashTable *hash = PL_NewDHashTable(&ChildrenHashOps,
sizeof(ChildrenHashEntry),
aNumKids);
if (!hash)
return;
for (nsRuleNode* curr = ChildrenList(); curr; curr = curr->mNextSibling) {
// This will never fail because of the initial size we gave the table.
ChildrenHashEntry *entry = static_cast<ChildrenHashEntry*>(

7
modules/libpref/prefapi.cpp
View File

@ -149,11 +149,8 @@ static nsresult pref_HashPref(const char *key, PrefValue value, PrefType type, u
nsresult PREF_Init()
{
if (!gHashTable.IsInitialized()) {
if (!PL_DHashTableInit(&gHashTable, &pref_HashTableOps,
sizeof(PrefHashEntry), fallible,
PREF_HASHTABLE_INITIAL_LENGTH)) {
return NS_ERROR_OUT_OF_MEMORY;
}
PL_DHashTableInit(&gHashTable, &pref_HashTableOps,
sizeof(PrefHashEntry), PREF_HASHTABLE_INITIAL_LENGTH);
PL_INIT_ARENA_POOL(&gPrefNameArena, "PrefNameArena",
PREFNAME_ARENA_SIZE);

11
netwerk/cache/nsCacheEntry.cpp vendored
View File

@ -402,14 +402,9 @@ nsCacheEntryHashTable::~nsCacheEntryHashTable()
nsresult
nsCacheEntryHashTable::Init()
{
nsresult rv = NS_OK;
initialized = PL_DHashTableInit(&table, &ops,
sizeof(nsCacheEntryHashTableEntry),
fallible, 256);
if (!initialized) rv = NS_ERROR_OUT_OF_MEMORY;
return rv;
PL_DHashTableInit(&table, &ops, sizeof(nsCacheEntryHashTableEntry), 256);
initialized = true;
return NS_OK;
}
void

6
netwerk/protocol/http/nsHttp.cpp
View File

@ -105,10 +105,8 @@ nsHttp::CreateAtomTable()
// The initial length for this table is a value greater than the number of
// known atoms (NUM_HTTP_ATOMS) because we expect to encounter a few random
// headers right off the bat.
if (!PL_DHashTableInit(&sAtomTable, &ops, sizeof(PLDHashEntryStub),
fallible, NUM_HTTP_ATOMS + 10)) {
return NS_ERROR_OUT_OF_MEMORY;
}
PL_DHashTableInit(&sAtomTable, &ops, sizeof(PLDHashEntryStub),
NUM_HTTP_ATOMS + 10);
// fill the table with our known atoms
const char *const atoms[] = {

15
parser/htmlparser/nsHTMLEntities.cpp
View File

@ -83,17 +83,10 @@ nsresult
nsHTMLEntities::AddRefTable(void)
{
if (!gTableRefCnt) {
if (!PL_DHashTableInit(&gEntityToUnicode, &EntityToUnicodeOps,
sizeof(EntityNodeEntry),
fallible, NS_HTML_ENTITY_COUNT)) {
return NS_ERROR_OUT_OF_MEMORY;
}
if (!PL_DHashTableInit(&gUnicodeToEntity, &UnicodeToEntityOps,
sizeof(EntityNodeEntry),
fallible, NS_HTML_ENTITY_COUNT)) {
PL_DHashTableFinish(&gEntityToUnicode);
return NS_ERROR_OUT_OF_MEMORY;
}
PL_DHashTableInit(&gEntityToUnicode, &EntityToUnicodeOps,
sizeof(EntityNodeEntry), NS_HTML_ENTITY_COUNT);
PL_DHashTableInit(&gUnicodeToEntity, &UnicodeToEntityOps,
sizeof(EntityNodeEntry), NS_HTML_ENTITY_COUNT);
for (const EntityNode *node = gEntityArray,
*node_end = ArrayEnd(gEntityArray);
node < node_end; ++node) {

6
security/manager/ssl/src/nsCertTree.cpp
View File

@ -175,10 +175,8 @@ void nsCertTree::ClearCompareHash()
nsresult nsCertTree::InitCompareHash()
{
ClearCompareHash();
if (!PL_DHashTableInit(&mCompareCache, &gMapOps,
sizeof(CompareCacheHashEntryPtr), fallible, 64)) {
return NS_ERROR_OUT_OF_MEMORY;
}
PL_DHashTableInit(&mCompareCache, &gMapOps,
sizeof(CompareCacheHashEntryPtr), 64);
return NS_OK;
}

7
xpcom/ds/nsStaticNameTable.cpp
View File

@ -138,11 +138,8 @@ nsStaticCaseInsensitiveNameTable::Init(const char* const aNames[],
return false;
}
if (!PL_DHashTableInit(&mNameTable, &nametable_CaseInsensitiveHashTableOps,
sizeof(NameTableEntry), fallible,
aLength)) {
return false;
}
PL_DHashTableInit(&mNameTable, &nametable_CaseInsensitiveHashTableOps,
sizeof(NameTableEntry), aLength);
for (int32_t index = 0; index < aLength; ++index) {
const char* raw = aNames[index];

38
xpcom/glue/pldhash.cpp
View File

@ -174,10 +174,7 @@ PL_NewDHashTable(const PLDHashTableOps* aOps, uint32_t aEntrySize,
uint32_t aLength)
{
PLDHashTable* table = new PLDHashTable();
if (!PL_DHashTableInit(table, aOps, aEntrySize, fallible, aLength)) {
delete table;
return nullptr;
}
PL_DHashTableInit(table, aOps, aEntrySize, aLength);
return table;
}
@ -217,9 +214,9 @@ MinCapacity(uint32_t aLength)
return (aLength * 4 + (3 - 1)) / 3; // == ceil(aLength * 4 / 3)
}
MOZ_ALWAYS_INLINE bool
MOZ_ALWAYS_INLINE void
PLDHashTable::Init(const PLDHashTableOps* aOps,
uint32_t aEntrySize, const fallible_t&, uint32_t aLength)
uint32_t aEntrySize, uint32_t aLength)
{
MOZ_ASSERT(!IsInitialized());
@ -229,7 +226,7 @@ PLDHashTable::Init(const PLDHashTableOps* aOps,
MOZ_ASSERT(mEntryStore == nullptr);
if (aLength > PL_DHASH_MAX_INITIAL_LENGTH) {
return false;
MOZ_CRASH("Initial length is too large");
}
// Compute the smallest capacity allowing |aLength| elements to be inserted
@ -243,51 +240,30 @@ PLDHashTable::Init(const PLDHashTableOps* aOps,
capacity = 1u << log2;
MOZ_ASSERT(capacity <= PL_DHASH_MAX_CAPACITY);
mOps = aOps;
mHashShift = PL_DHASH_BITS - log2;
mEntrySize = aEntrySize;
mEntryCount = mRemovedCount = 0;
mGeneration = 0;
uint32_t nbytes;
if (!SizeOfEntryStore(capacity, aEntrySize, &nbytes)) {
return false; // overflowed
MOZ_CRASH("Initial entry store size is too large");
}
mEntryStore = nullptr;
METER(memset(&mStats, 0, sizeof(mStats)));
// Set this only once we reach a point where we know we can't fail.
mOps = aOps;
#ifdef DEBUG
mRecursionLevel = 0;
#endif
return true;
}
bool
PL_DHashTableInit(PLDHashTable* aTable, const PLDHashTableOps* aOps,
uint32_t aEntrySize,
const fallible_t& aFallible, uint32_t aLength)
{
return aTable->Init(aOps, aEntrySize, aFallible, aLength);
}
void
PL_DHashTableInit(PLDHashTable* aTable, const PLDHashTableOps* aOps,
uint32_t aEntrySize, uint32_t aLength)
{
if (!PL_DHashTableInit(aTable, aOps, aEntrySize, fallible, aLength)) {
if (aLength > PL_DHASH_MAX_INITIAL_LENGTH) {
MOZ_CRASH(); // the asked-for length was too big
}
uint32_t capacity = MinCapacity(aLength), nbytes;
if (!SizeOfEntryStore(capacity, aEntrySize, &nbytes)) {
MOZ_CRASH(); // the required mEntryStore size was too big
}
NS_ABORT_OOM(nbytes); // allocation failed
}
aTable->Init(aOps, aEntrySize, aLength);
}
/*

14
xpcom/glue/pldhash.h
View File

@ -269,8 +269,7 @@ public:
uint32_t EntryCount() const { return mEntryCount; }
uint32_t Generation() const { return mGeneration; }
bool Init(const PLDHashTableOps* aOps, uint32_t aEntrySize,
const mozilla::fallible_t&, uint32_t aLength);
void Init(const PLDHashTableOps* aOps, uint32_t aEntrySize, uint32_t aLength);
void Finish();
@ -467,7 +466,7 @@ const PLDHashTableOps* PL_DHashGetStubOps(void);
/*
* Dynamically allocate a new PLDHashTable, initialize it using
* PL_DHashTableInit, and return its address. Return null on allocation failure.
* PL_DHashTableInit, and return its address. Never returns null.
*/
PLDHashTable* PL_NewDHashTable(
const PLDHashTableOps* aOps, uint32_t aEntrySize,
@ -494,15 +493,6 @@ void PL_DHashTableInit(
PLDHashTable* aTable, const PLDHashTableOps* aOps,
uint32_t aEntrySize, uint32_t aLength = PL_DHASH_DEFAULT_INITIAL_LENGTH);
/*
* Initialize aTable. This is the same as PL_DHashTableInit, except that it
* returns a boolean indicating success, rather than crashing on failure.
*/
MOZ_WARN_UNUSED_RESULT bool PL_DHashTableInit(
PLDHashTable* aTable, const PLDHashTableOps* aOps,
uint32_t aEntrySize, const mozilla::fallible_t&,
uint32_t aLength = PL_DHASH_DEFAULT_INITIAL_LENGTH);
/*
* Free |aTable|'s entry storage (via aTable->mOps->freeTable). Use this
* function to destroy a PLDHashTable that is allocated on the stack or in

83
xpcom/tests/TestPLDHash.cpp
View File

@ -22,12 +22,20 @@ static bool test_pldhash_Init_capacity_ok()
}
// Try the largest allowed capacity. With PL_DHASH_MAX_CAPACITY==1<<26, this
// will allocate 0.5GB of entry store on 32-bit platforms and 1GB on 64-bit
// platforms.
if (!PL_DHashTableInit(&t, PL_DHashGetStubOps(), sizeof(PLDHashEntryStub),
mozilla::fallible, PL_DHASH_MAX_INITIAL_LENGTH)) {
return false;
}
// would allocate (if we added an element) 0.5GB of entry store on 32-bit
// platforms and 1GB on 64-bit platforms.
//
// Ideally we'd also try (a) a too-large capacity, and (b) a large capacity
// combined with a large entry size that when multipled overflow. But those
// cases would cause the test to abort immediately.
//
// Furthermore, ideally we'd also try a large-but-ok capacity that almost but
// doesn't quite overflow, but that would result in allocating just under 4GB
// of entry storage. That's very likely to fail on 32-bit platforms, so such
// a test wouldn't be reliable.
//
PL_DHashTableInit(&t, PL_DHashGetStubOps(), sizeof(PLDHashEntryStub),
PL_DHASH_MAX_INITIAL_LENGTH);
// Check that Init() sets |ops|.
if (!t.IsInitialized()) {
@ -43,67 +51,6 @@ static bool test_pldhash_Init_capacity_ok()
return true;
}
static bool test_pldhash_Init_capacity_too_large()
{
PLDHashTable t;
// Check that the constructor nulls |ops|.
if (t.IsInitialized()) {
return false;
}
// Try the smallest too-large capacity.
if (PL_DHashTableInit(&t, PL_DHashGetStubOps(),
sizeof(PLDHashEntryStub),
mozilla::fallible,
PL_DHASH_MAX_INITIAL_LENGTH + 1)) {
return false; // it succeeded!?
}
// Don't call PL_DHashTableFinish() here; it's not safe after Init() failure.
// Check that |ops| is still null.
if (t.IsInitialized()) {
return false;
}
return true;
}
static bool test_pldhash_Init_overflow()
{
PLDHashTable t;
// Check that the constructor nulls |ops|.
if (t.IsInitialized()) {
return false;
}
// Try an acceptable capacity, but one whose byte size overflows uint32_t.
//
// Ideally we'd also try a large-but-ok capacity that almost but doesn't
// quite overflow, but that would result in allocating just under 4GB of
// entry storage. That's very likely to fail on 32-bit platforms, so such a
// test wouldn't be reliable.
struct OneKBEntry {
PLDHashEntryHdr hdr;
char buf[1024 - sizeof(PLDHashEntryHdr)];
};
if (PL_DHashTableInit(&t, PL_DHashGetStubOps(), sizeof(OneKBEntry),
mozilla::fallible, PL_DHASH_MAX_INITIAL_LENGTH)) {
return false; // it succeeded!?
}
// Don't call PL_DHashTableFinish() here; it's not safe after Init() failure.
// Check that |ops| is still null.
if (t.IsInitialized()) {
return false;
}
return true;
}
static bool test_pldhash_lazy_storage()
{
PLDHashTable t;
@ -226,8 +173,6 @@ static const struct Test {
TestFunc func;
} tests[] = {
DECL_TEST(test_pldhash_Init_capacity_ok),
DECL_TEST(test_pldhash_Init_capacity_too_large),
DECL_TEST(test_pldhash_Init_overflow),
DECL_TEST(test_pldhash_lazy_storage),
// See bug 931062, we skip this test on Android due to OOM.
#ifndef MOZ_WIDGET_ANDROID