JS_SET_TRACING_DETAILS 编辑
This article covers features introduced in SpiderMonkey 1.8
Set debugging information about the next thing to be traced by a JSTracer.
Syntax
JS_SET_TRACING_DETAILS(trc, printer, arg, index)
| Name | Type | Description |
|---|---|---|
trc | JSTracer * | The tracer whose debugging hooks are to be set. |
printer | JSTraceNamePrinter | A callback function, described below; or NULL. |
arg | void * | See the description. |
index | size_t | See the description. |
Callback syntax
typedef void (*JSTraceNamePrinter)(JSTracer *trc, char *buf, size_t bufsize);
| Name | Type | Description |
|---|---|---|
trc | JSTracer * | The tracer. |
buf | char * | Out parameter. The callback stores a string describing the reference traced in buf. |
bufsize | size_t | The size of buf, in chars. |
Description
Set debugging information about a reference to a traceable thing to prepare for the following call to JS_CallTracer.
When printer is null, arg must be const char * or char * C string naming the reference and index must be either (size_t)-1 indicating that the name alone describes the reference or it must be an index into some array vector that stores the reference.
When printer is not null, the arg and index arguments are available to the callback as the debugPrinterArg and debugPrintIndex fields of trc.
The storage for name or callback's arguments needs to live only until the following call to JS_CallTracer returns.
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