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pre-computed identifer hashes

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This commit is contained in:
Kayne Ruse
2022-08-11 18:36:03 +01:00
parent 1430aefdf3
commit 00812e7a73
5 changed files with 34 additions and 27 deletions
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44
source/literal.c
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@@ -32,6 +32,25 @@ static void printToBuffer(const char* str) {
globalPrintCount += strlen(str);
}
//hash util functions
static unsigned int hashString(const char* string, int length) {
unsigned int hash = 2166136261u;
for (int i = 0; i < length; i++) {
hash *= string[i];
hash *= 16777619;
}
return hash;
}
static unsigned int hash(unsigned int x) {
x = ((x >> 16) ^ x) * 0x45d9f3b;
x = ((x >> 16) ^ x) * 0x45d9f3b;
x = (x >> 16) ^ x;
return x;
}
//exposed functions
void printLiteral(Literal literal) {
printLiteralCustom(literal, stdoutWrapper);
@@ -194,7 +213,7 @@ Literal _toStringLiteral(char* str) {
}
Literal _toIdentifierLiteral(char* str) {
return ((Literal){LITERAL_IDENTIFIER,{.identifier.ptr = (char*)str,.identifier.length = strlen((char*)str)}});
return ((Literal){LITERAL_IDENTIFIER,{.identifier.ptr = (char*)str,.identifier.length = strlen((char*)str), .identifier.hash=hashString(str, strlen((char*)str))}});
}
char* copyString(char* original, int length) {
@@ -238,7 +257,7 @@ bool literalsAreEqual(Literal lhs, Literal rhs) {
//TODO: literal array and literal dictionary equality checks
case LITERAL_IDENTIFIER:
if (STRLEN_I(lhs) != STRLEN_I(rhs)) {
if (HASH_I(lhs) != HASH_I(rhs) && STRLEN_I(lhs) != STRLEN_I(rhs)) {
return false;
}
return !strncmp(AS_IDENTIFIER(lhs), AS_IDENTIFIER(rhs), STRLEN_I(lhs));
@@ -250,25 +269,6 @@ bool literalsAreEqual(Literal lhs, Literal rhs) {
}
}
//hash functions
static unsigned int hashString(const char* string, int length) {
unsigned int hash = 2166136261u;
for (int i = 0; i < length; i++) {
hash *= string[i];
hash *= 16777619;
}
return hash;
}
static unsigned int hash(unsigned int x) {
x = ((x >> 16) ^ x) * 0x45d9f3b;
x = ((x >> 16) ^ x) * 0x45d9f3b;
x = (x >> 16) ^ x;
return x;
}
int hashLiteral(Literal lit) {
switch(lit.type) {
case LITERAL_NULL:
@@ -306,7 +306,7 @@ int hashLiteral(Literal lit) {
}
case LITERAL_IDENTIFIER:
return hashString(AS_IDENTIFIER(lit), STRLEN_I(lit));
return HASH_I(lit); //pre-computed
default:
//should never bee seen