OXYGENHUB
# ea9efff4e540 x16-emulator / src / coverage.c
2.4 KiB · C · last changed chore(): initial commit 15 days ago source blame history raw
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// Commander X16 Emulator
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// Execution coverage: which addresses the CPU fetched an instruction from.
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// See coverage.h for the file it writes.
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "memory.h"
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#include "coverage.h"
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bool coverage_enabled = false;
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volatile bool coverage_stop = false;
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static const char *coverage_path;   // argv's, which lives as long as the program
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static uint8_t *low;      // $0000-$9FFF
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static uint8_t *ram;      // 256 banks of $A000-$BFFF
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static uint8_t *rom;      // 256 banks of $C000-$FFFF
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#define LOW_SIZE  0xa000
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#define RAM_SIZE  0x2000
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#define ROM_SIZE  0x4000
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// SIGTERM ends the CPU loop rather than the process, so main's shutdown runs
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// and the marks are written; a second SIGTERM, or SIGKILL, still ends it.
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static void
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coverage_sigterm(int sig)
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{
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	(void)sig;
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	coverage_stop = true;
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	signal(SIGTERM, SIG_DFL);
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}
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bool
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coverage_init(const char *path)
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{
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	low = calloc(LOW_SIZE, 1);
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	ram = calloc(256 * RAM_SIZE, 1);
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	rom = calloc(256 * ROM_SIZE, 1);
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	coverage_path = path;
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	if (!low || !ram || !rom) {
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		return false;
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	}
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	coverage_enabled = true;
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	signal(SIGTERM, coverage_sigterm);
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	return true;
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}
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void
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coverage_mark(uint16_t pc)
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{
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	if (pc < 0xa000) {
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		low[pc] = 1;
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	} else if (pc < 0xc000) {
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		ram[(memory_get_ram_bank() << 13) + (pc - 0xa000)] = 1;
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	} else {
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		rom[(memory_get_rom_bank() << 14) + (pc - 0xc000)] = 1;
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	}
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}
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// One line per run of marked addresses in [0, size), named from base.
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static void
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write_runs(FILE *f, char kind, int bank, const uint8_t *marks, int size, int base)
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{
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	for (int i = 0; i < size; i++) {
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		if (!marks[i]) {
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			continue;
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		}
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		int start = i;
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		while (i + 1 < size && marks[i + 1]) {
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			i++;
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		}
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		if (bank < 0) {
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			fprintf(f, "%c %04x-%04x\n", kind, base + start, base + i);
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		} else {
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			fprintf(f, "%c %02x:%04x-%04x\n", kind, bank, base + start, base + i);
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		}
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	}
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}
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void
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coverage_write(void)
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{
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	if (!coverage_enabled) {
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		return;
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	}
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	FILE *f = fopen(coverage_path, "w");
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	if (!f) {
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		fprintf(stderr, "Cannot write coverage to %s!\n", coverage_path);
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		return;
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	}
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	fprintf(f, "x16emu-coverage 1\n");
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	write_runs(f, 'm', -1, low, LOW_SIZE, 0);
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	for (int bank = 0; bank < 256; bank++) {
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		write_runs(f, 'r', bank, ram + (bank << 13), RAM_SIZE, 0xa000);
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	}
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	for (int bank = 0; bank < 256; bank++) {
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		write_runs(f, 'k', bank, rom + (bank << 14), ROM_SIZE, 0xc000);
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	}
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	fclose(f);
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}