mirror of
https://github.com/ZDoom/qzdoom.git
synced 2024-12-11 21:21:47 +00:00
291 lines
9.3 KiB
C++
291 lines
9.3 KiB
C++
/* re2c lesson 001_upn_calculator, main.b.re, (c) M. Boerger, L. Allan 2006 */
|
|
/*!ignore:re2c
|
|
|
|
- basic interface for string reading
|
|
|
|
. We define the macros YYCTYPE, YYCURSOR, YYLIMIT, YYMARKER, YYFILL
|
|
. YYCTYPE is the type re2c operates on or in other words the type that
|
|
it generates code for. While it is not a big difference when we were
|
|
using 'unsigned char' here we would need to run re2c with option -w
|
|
to fully support types with sieof() > 1.
|
|
. YYCURSOR is used internally and holds the current scanner position. In
|
|
expression handlers, the code blocks after re2c expressions, this can be
|
|
used to identify the end of the token.
|
|
. YYMARKER is not always being used so we set an initial value to avoid
|
|
a compiler warning.
|
|
. YYLIMIT stores the end of the input. Unfortunatley we have to use strlen()
|
|
in this lesson. In the next example we see one way to get rid of it.
|
|
. We use a 'for(;;)'-loop around the scanner block. We could have used a
|
|
'while(1)'-loop instead but some compilers generate a warning for it.
|
|
. To make the output more readable we use 're2c:indent:top' scanner
|
|
configuration that configures re2c to prepend a single tab (the default)
|
|
to the beginning of each output line.
|
|
. The following lines are expressions and for each expression we output the
|
|
token name and continue the scanner loop.
|
|
. The second last token detects the end of our input, the terminating zero in
|
|
our input string. In other scanners detecting the end of input may vary.
|
|
For example binary code may contain \0 as valid input.
|
|
. The last expression accepts any input character. It tells re2c to accept
|
|
the opposit of the empty range. This includes numbers and our tokens but
|
|
as re2c goes from top to botton when evaluating the expressions this is no
|
|
problem.
|
|
. The first three rules show that re2c actually prioritizes the expressions
|
|
from top to bottom. Octal number require a starting "0" and the actual
|
|
number. Normal numbers start with a digit greater 0. And zero is finally a
|
|
special case. A single "0" is detected by the last rule of this set. And
|
|
valid ocal number is already being detected by the first rule. This even
|
|
includes multi "0" sequences that in octal notation also means zero.
|
|
Another way would be to only use two rules:
|
|
"0" [0-9]+
|
|
"0" | ( [1-9] [0-9]* )
|
|
A full description of re2c rule syntax can be found in the manual.
|
|
*/
|
|
|
|
#define VC_EXTRALEAN // Exclude rarely-used stuff from Windows headers
|
|
|
|
#if _MSC_VER > 1200
|
|
#define WINVER 0x0400 // Change this to the appropriate value to target Windows 98 and Windows 2000 or later.
|
|
#endif // Prevents warning from vc7.1 complaining about redefinition
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <assert.h>
|
|
#include <string.h>
|
|
#include <windows.h>
|
|
#include "HiResTimer.h"
|
|
|
|
static char gTestBuf[1000] = "";
|
|
|
|
/**
|
|
* @brief Setup HiResolution timer and confirm it is working ok
|
|
*/
|
|
void InitHiResTimerAndVerifyWorking(void)
|
|
{
|
|
double elapsed;
|
|
HrtInit();
|
|
HrtSetPriority(ABOVE_NORMAL_PRIORITY_CLASS);
|
|
HrtStart();
|
|
Sleep(100);
|
|
elapsed = HrtElapsedMillis();
|
|
if ((elapsed < 90) || (elapsed > 110)) {
|
|
printf("HiResTimer misbehaving: %f\n", elapsed);
|
|
exit(2);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @brief Scan for numbers in different formats
|
|
*/
|
|
int ScanFullSpeed(char *pzStrToScan, size_t lenStrToScan)
|
|
{
|
|
unsigned char *pzCurScanPos = (unsigned char*)pzStrToScan;
|
|
unsigned char *pzBacktrackInfo = 0;
|
|
#define YYCTYPE unsigned char
|
|
#define YYCURSOR pzCurScanPos
|
|
#define YYLIMIT (pzStrToScan+lenStrToScan)
|
|
#define YYMARKER pzBacktrackInfo
|
|
#define YYFILL(n)
|
|
|
|
for(;;)
|
|
{
|
|
/*!re2c
|
|
re2c:indent:top = 2;
|
|
[1-9][0-9]* { continue; }
|
|
[0][0-9]+ { continue; }
|
|
"+" { continue; }
|
|
"-" { continue; }
|
|
"\000" { return 0; }
|
|
[^] { return 1; }
|
|
*/
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @brief Scan for numbers in different formats
|
|
*/
|
|
int scan(char *pzStrToScan, size_t lenStrToScan)
|
|
{
|
|
unsigned char *pzCurScanPos = (unsigned char*)pzStrToScan;
|
|
unsigned char *pzBacktrackInfo = 0;
|
|
#define YYCTYPE unsigned char
|
|
#define YYCURSOR pzCurScanPos
|
|
#define YYLIMIT (pzStrToScan+lenStrToScan)
|
|
#define YYMARKER pzBacktrackInfo
|
|
#define YYFILL(n)
|
|
|
|
for(;;)
|
|
{
|
|
/*!re2c
|
|
re2c:indent:top = 2;
|
|
[1-9][0-9]* { printf("Num\n"); strcat(gTestBuf, "Num "); continue; }
|
|
[0][0-9]+ { printf("Oct\n"); strcat(gTestBuf, "Oct "); continue; }
|
|
"+" { printf("+\n"); strcat(gTestBuf, "+ "); continue; }
|
|
"-" { printf("-\n"); strcat(gTestBuf, "- "); continue; }
|
|
"\000" { printf("EOF\n"); return 0; }
|
|
[^] { printf("ERR\n"); strcat(gTestBuf, "ERR "); return 1; }
|
|
*/
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @brief Show high resolution elapsed time for 10,000 and 100,000 loops
|
|
*/
|
|
void DoTimingsOfStrnCmp(void)
|
|
{
|
|
char testStr[] = "Hello, world";
|
|
int totLoops = 10000;
|
|
int totFoundCount = 0;
|
|
int foundCount = 0;
|
|
int loop;
|
|
int rc;
|
|
const int progressAnd = 0xFFFFF000;
|
|
double elapsed;
|
|
|
|
printf("\n\n%d loops with * every %d loops to confirm\n", totLoops, ((~progressAnd) + 1));
|
|
|
|
HrtStart();
|
|
for (loop = 0; loop < totLoops; ++loop) {
|
|
foundCount = 0;
|
|
rc = strncmp(testStr, "Hello", 5);
|
|
if (rc == 0) {
|
|
foundCount++;
|
|
totFoundCount++;
|
|
if ((totFoundCount & progressAnd) == totFoundCount) {
|
|
printf("*");
|
|
}
|
|
}
|
|
}
|
|
elapsed = HrtElapsedMillis();
|
|
printf("\nstrncmp Elapsed for %7d loops milliseconds: %7.3f\n", totLoops, elapsed);
|
|
printf("FoundCount each loop: %d\n", foundCount);
|
|
printf("TotalFoundCount for all loops: %d\n", totFoundCount);
|
|
|
|
totLoops = 100000;
|
|
HrtStart();
|
|
for (loop = 0; loop < totLoops; ++loop) {
|
|
foundCount = 0;
|
|
rc = strncmp(testStr, "Hello", 5);
|
|
if (rc == 0) {
|
|
foundCount++;
|
|
totFoundCount++;
|
|
if ((totFoundCount & progressAnd) == totFoundCount) {
|
|
printf("*");
|
|
}
|
|
}
|
|
}
|
|
elapsed = HrtElapsedMillis();
|
|
printf("\nstrncmp Elapsed for %7d loops milliseconds: %7.3f\n", totLoops, elapsed);
|
|
printf("FoundCount each loop: %d\n", foundCount);
|
|
printf("TotalFoundCount for all loops: %d\n", totFoundCount);
|
|
}
|
|
|
|
/**
|
|
* @brief Show high resolution elapsed time for 10,000 and 100,000 loops
|
|
*/
|
|
void DoTimingsOfRe2c(void)
|
|
{
|
|
char* testStrings[] = { "123", "1234", "+123", "01234", "-04321", "abc", "123abc" };
|
|
const int testCount = sizeof(testStrings) / sizeof(testStrings[0]);
|
|
int i;
|
|
int totLoops = 10000 / testCount; // Doing more than one per loop
|
|
int totFoundCount = 0;
|
|
int foundCount = 0;
|
|
int loop;
|
|
int rc;
|
|
const int progressAnd = 0xFFFFF000;
|
|
double elapsed;
|
|
|
|
printf("\n\n%d loops with * every %d loops to confirm\n", totLoops, ((~progressAnd) + 1));
|
|
|
|
HrtStart();
|
|
for (loop = 0; loop < totLoops; ++loop) {
|
|
foundCount = 0;
|
|
strcpy(gTestBuf, "");
|
|
for (i = 0; i < testCount; ++i) {
|
|
char* pzCurStr = testStrings[i];
|
|
size_t len = strlen(pzCurStr); // Calc of strlen slows things down ... std::string?
|
|
rc = ScanFullSpeed(pzCurStr, len);
|
|
if (rc == 0) {
|
|
foundCount++;
|
|
totFoundCount++;
|
|
if ((totFoundCount & progressAnd) == totFoundCount) {
|
|
printf("*");
|
|
}
|
|
}
|
|
}
|
|
}
|
|
elapsed = HrtElapsedMillis();
|
|
printf("\nRe2c Elapsed for %7d loops milliseconds: %7.3f\n", totLoops, elapsed);
|
|
printf("FoundCount each loop: %d\n", foundCount);
|
|
printf("TotalFoundCount for all loops: %d\n", totFoundCount);
|
|
|
|
totLoops = 100000 / testCount;
|
|
printf("\n\n%d loops with * every %d loops to confirm\n", totLoops, ((~progressAnd) + 1));
|
|
|
|
HrtStart();
|
|
for (loop = 0; loop < totLoops; ++loop) {
|
|
foundCount = 0;
|
|
strcpy(gTestBuf, "");
|
|
for (i = 0; i < testCount; ++i) {
|
|
char* pzCurStr = testStrings[i];
|
|
size_t len = strlen(pzCurStr); // Calc of strlen slows things down ... std::string?
|
|
rc = ScanFullSpeed(pzCurStr, len);
|
|
if (rc == 0) {
|
|
foundCount++;
|
|
totFoundCount++;
|
|
if ((totFoundCount & progressAnd) == totFoundCount) {
|
|
printf("*");
|
|
}
|
|
}
|
|
}
|
|
}
|
|
elapsed = HrtElapsedMillis();
|
|
printf("\nRe2c Elapsed for %7d loops milliseconds: %7.3f\n", totLoops, elapsed);
|
|
printf("FoundCount each loop: %d\n", foundCount);
|
|
printf("TotalFoundCount for all loops: %d\n", totFoundCount);
|
|
}
|
|
|
|
/**
|
|
* @brief Entry point for console app
|
|
*/
|
|
int main(int argc, char **argv)
|
|
{
|
|
char testStr_A[] = "123";
|
|
char* testStr_B = "456";
|
|
char* testStrings[] = { "123", "1234", "+123", "01234", "-04321", "abc", "123abc" };
|
|
const int testCount = sizeof(testStrings) / sizeof(testStrings[0]);
|
|
int i;
|
|
|
|
int rc = scan(testStr_A, 3);
|
|
printf("rc: %d\n", rc);
|
|
|
|
rc = scan(testStr_B, 3);
|
|
printf("rc: %d\n", rc);
|
|
|
|
rc = scan("789", 3);
|
|
printf("rc: %d\n", rc);
|
|
|
|
strcpy(gTestBuf, "");
|
|
for (i = 0; i < testCount; ++i) {
|
|
char* pzCurStr = testStrings[i];
|
|
size_t len = strlen(pzCurStr);
|
|
scan(pzCurStr, len);
|
|
}
|
|
printf("%s\n", gTestBuf);
|
|
rc = strcmp(gTestBuf, "Num Num + Num Oct - Oct ERR Num ERR ");
|
|
if (rc == 0) {
|
|
printf("Success\n");
|
|
}
|
|
else {
|
|
printf("Failure\n");
|
|
}
|
|
assert(0 == rc); // Doesn't work with Release build
|
|
|
|
InitHiResTimerAndVerifyWorking();
|
|
|
|
DoTimingsOfStrnCmp();
|
|
|
|
DoTimingsOfRe2c();
|
|
|
|
return 0;
|
|
}
|