105 lines
2.3 KiB
Text
105 lines
2.3 KiB
Text
== Debug Logging
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Declared in `<joey/debug.h>`.
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A crash-tracing logger that writes to a file beside the executable (on DVX,
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in the program's settings folder, `CONFIG\APPS\JOEYLIB\NAME\JOEYLOG.TXT`).
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Debugging a program on an emulated 1988 machine is awkward, and this is
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usually the fastest way to find out what it did before it stopped doing it.
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The headless run scripts retrieve the log automatically.
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[NOTE]
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====
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The logger needs a multi-kilobyte ring buffer, which the tightest targets
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cannot spare. Space Taxi compiles it out entirely on the IIgs and X68000 for
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that reason. If you are debugging a memory-tight program, expect to do the
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same and to observe hardware state through the emulator instead.
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====
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=== jlLog
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[source,c]
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----
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void jlLog(const char *msg);
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----
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Appends a message to the log.
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[cols="1,1,4", options="header"]
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|===
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|Parameter |Type |Description
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|`msg` |`const char *` |NUL-terminated message.
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|===
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*Returns:* nothing.
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=== jlLogF
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[source,c]
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----
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void jlLogF(const char *fmt, ...);
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----
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Appends a formatted message, `printf` style, as one line: like `jlLog`, the
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library ends the line, so the format needs no trailing `\n`.
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[cols="1,1,4", options="header"]
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|===
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|Parameter |Type |Description
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|`fmt` |`const char *` |Format string.
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|`...` | |Arguments matching the format string.
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|===
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*Returns:* nothing.
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[TIP]
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====
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Keep format strings simple. The C libraries on these targets vary in what they
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support, and on the IIgs the `printf` family is expensive in both code size and
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time.
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====
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=== jlLogFlush
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[source,c]
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----
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void jlLogFlush(void);
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----
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Flushes buffered log output to disk. Call it before anything that might crash
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or exit, or the last and most interesting lines may never be written.
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*Parameters:* none. *Returns:* nothing.
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=== jlLogReset
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[source,c]
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----
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void jlLogReset(void);
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----
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Clears the log, discarding previous contents. Call once at startup so each run
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produces a fresh log rather than appending to the last one.
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*Parameters:* none. *Returns:* nothing.
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[source,c]
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----
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int main(void) {
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jlConfigT config;
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config.codegenBytes = 32UL * 1024;
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if (!jlInit(&config)) {
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return 1;
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}
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jlLogReset();
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jlLogF("build %s %s", __DATE__, __TIME__);
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// ... game ...
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jlLogFlush();
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jlShutdown();
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return 0;
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}
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----
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