averello/swift-mirror
1
0
Fork 0
mirror of https://github.com/apple/swift.git synced 2025-12-14 20:36:38 +01:00
Code Issues Packages Projects Releases Wiki Activity

Force the DJB hash seed to 0 for compatibility with HashString.

Browse Source 
The obsolete llvm::HashString() was equivalent to
llvm::djbHash(seed=0) and was removed from llvm. This patch replaces
all occurences of llvm::HashString() with llvm::djbHash(seed=0), no
functional change.

The default seed of llvm::djbHash() is supposed to yield a higher
quality result that using seed=0, but changing it looks like it
affects the ordering of SIL serialization.
This commit is contained in:
Adrian Prantl
2018-02-28 14:10:25 -08:00
parent b7eb3bfeee
commit 0747d9a339
6 changed files with 39 additions and 20 deletions
Download Patch File Download Diff File Expand all files Collapse all files

23
lib/Serialization/ModuleFile.cpp
View File

@@ -318,7 +318,8 @@ public:
hash_value_type ComputeHash(internal_key_type key) {
if (key.first == DeclBaseName::Kind::Normal) {
return llvm::djbHash(key.second);
// FIXME: DJB seed=0, audit whether the default seed could be used.
return llvm::djbHash(key.second, 0);
} else {
return (hash_value_type)key.first;
}
@@ -380,7 +381,8 @@ public:
}
hash_value_type ComputeHash(internal_key_type key) {
return llvm::djbHash(key);
// FIXME: DJB seed=0, audit whether the default seed could be used.
return llvm::djbHash(key, 0);
}
static bool EqualKey(internal_key_type lhs, internal_key_type rhs) {
@@ -438,8 +440,9 @@ public:
return ID;
}
hash_value_type ComputeHash(internal_key_type key) {
return llvm::djbHash(key);
hash_value_type ComputeHash(iternal_key_type key) {
// FIXME: DJB seed=0, audit whether the default seed could be used.
return llvm::djbHash(key, 0);
}
static bool EqualKey(internal_key_type lhs, internal_key_type rhs) {
@@ -476,7 +479,8 @@ public:
}
hash_value_type ComputeHash(internal_key_type key) {
return llvm::djbHash(key);
// FIXME: DJB seed=0, audit whether the default seed could be used.
return llvm::djbHash(key, 0);
}
static bool EqualKey(internal_key_type lhs, internal_key_type rhs) {
@@ -531,7 +535,8 @@ public:
hash_value_type ComputeHash(internal_key_type key) {
if (key.first == DeclBaseName::Kind::Normal) {
return llvm::djbHash(key.second);
// FIXME: DJB seed=0, audit whether the default seed could be used.
return llvm::djbHash(key.second, 0);
} else {
return (hash_value_type)key.first;
}
@@ -704,7 +709,8 @@ public:
}
hash_value_type ComputeHash(internal_key_type key) {
return llvm::djbHash(key);
// FIXME: DJB seed=0, audit whether the default seed could be used.
return llvm::djbHash(key, 0);
}
static bool EqualKey(internal_key_type lhs, internal_key_type rhs) {
@@ -891,7 +897,8 @@ public:
hash_value_type ComputeHash(internal_key_type key) {
assert(!key.empty());
return llvm::djbHash(key);
// FIXME: DJB seed=0, audit whether the default seed could be used.
return llvm::djbHash(key, 0);
}
static bool EqualKey(internal_key_type lhs, internal_key_type rhs) {