HyriseSQLParser/lemon_example/main.cpp

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#include <stdio.h>
#include <stdlib.h>
#include <thread>
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#include "token_def.h"
#include "lemon_parser.h"
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#include "flex_scanner.h"
// Based on https://github.com/theory/flex-lemon-example
// and http://stackoverflow.com/questions/24833465/bison-yacc-vs-lemon-vs-standard-input
typedef float ResultType;
void *ParseAlloc(void *(*mallocProc)(size_t));
void ParseFree(void *p, void (*freeProc)(void*));
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void Parse(void *yyp, int yymajor, LexerToken* token, ResultType*);
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// int yylex(void);
// int yylval;
float parseString(const char* string) {
yyscan_t scanner;
yylex_init(&scanner);
// Scan the provided string
YY_BUFFER_STATE state = yy_scan_string(string, scanner);
void* lemonParser = ParseAlloc(malloc);
int tokenCode;
ResultType result;
do {
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LexerToken token;
tokenCode = yylex(&token, scanner);
Parse(lemonParser, tokenCode, &token, &result);
// printf("Token %d\n", tokenCode);
} while (tokenCode > 0);
return result;
}
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int parse_count = 0;
void multithreadTest(int numOfParses, int id) {
for (int n = 0; n < numOfParses; ++n) {
int a = rand() % 1000 + 1;
int b = rand() % 1000 + 1;
int c = a + b;
char string[32];
sprintf(string, "%d + %d", a, b);
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parse_count++;
int result = parseString(string);
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if (parse_count != 1) printf("+");
parse_count--;
if (result != c) printf("Error[%d]! %s != %d\n", id, string, result);
}
}
int main(void) {
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const int numThreads = 20;
int numRuns = 300;
std::thread threads[numThreads];
for (int n = 0; n < numThreads; ++n) {
threads[n] = std::thread(multithreadTest, numRuns, n);
}
for (int n = 0; n < numThreads; ++n) {
threads[n].join();
}
return 0;
}