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js/xpconnect/src/XPCDebug.cpp@b8a032363ba2 (annotated)

js/xpconnect/src/XPCDebug.cpp

Thu, 22 Jan 2015 13:21:57 +0100

author

Michael Schloh von Bennewitz <michael@schloh.com>

date

Thu, 22 Jan 2015 13:21:57 +0100

branch

TOR_BUG_9701

changeset 15

b8a032363ba2

permissions

-rw-r--r--

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

michael@0	1	/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
michael@0	2	/* vim: set ts=8 sts=4 et sw=4 tw=99: */
michael@0	3	/* This Source Code Form is subject to the terms of the Mozilla Public
michael@0	4	* License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0	5	* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0	6
michael@0	7	#include "xpcprivate.h"
michael@0	8	#include "jsprf.h"
michael@0	9	#include "js/OldDebugAPI.h"
michael@0	10
michael@0	11	#ifdef XP_WIN
michael@0	12	#include <windows.h>
michael@0	13	#endif
michael@0	14
michael@0	15	static void DebugDump(const char* fmt, ...)
michael@0	16	{
michael@0	17	char buffer[2048];
michael@0	18	va_list ap;
michael@0	19	va_start(ap, fmt);
michael@0	20	#ifdef XPWIN
michael@0	21	_vsnprintf(buffer, sizeof(buffer), fmt, ap);
michael@0	22	#else
michael@0	23	vsnprintf(buffer, sizeof(buffer), fmt, ap);
michael@0	24	#endif
michael@0	25	buffer[sizeof(buffer)-1] = '\0';
michael@0	26	va_end(ap);
michael@0	27	#ifdef XP_WIN
michael@0	28	if (IsDebuggerPresent()) {
michael@0	29	OutputDebugStringA(buffer);
michael@0	30	}
michael@0	31	#endif
michael@0	32	printf("%s", buffer);
michael@0	33	}
michael@0	34
michael@0	35	bool
michael@0	36	xpc_DumpJSStack(JSContext* cx, bool showArgs, bool showLocals, bool showThisProps)
michael@0	37	{
michael@0	38	if (char* buf = xpc_PrintJSStack(cx, showArgs, showLocals, showThisProps)) {
michael@0	39	DebugDump("%s\n", buf);
michael@0	40	JS_smprintf_free(buf);
michael@0	41	}
michael@0	42	return true;
michael@0	43	}
michael@0	44
michael@0	45	char*
michael@0	46	xpc_PrintJSStack(JSContext* cx, bool showArgs, bool showLocals,
michael@0	47	bool showThisProps)
michael@0	48	{
michael@0	49	JS::AutoSaveExceptionState state(cx);
michael@0	50
michael@0	51	char *buf = JS::FormatStackDump(cx, nullptr, showArgs, showLocals, showThisProps);
michael@0	52	if (!buf)
michael@0	53	DebugDump("%s", "Failed to format JavaScript stack for dump\n");
michael@0	54
michael@0	55	state.restore();
michael@0	56	return buf;
michael@0	57	}
michael@0	58
michael@0	59	/***************************************************************************/
michael@0	60
michael@0	61	static void
michael@0	62	xpcDumpEvalErrorReporter(JSContext *cx, const char *message,
michael@0	63	JSErrorReport *report)
michael@0	64	{
michael@0	65	DebugDump("Error: %s\n", message);
michael@0	66	}
michael@0	67
michael@0	68	bool
michael@0	69	xpc_DumpEvalInJSStackFrame(JSContext* cx, uint32_t frameno, const char* text)
michael@0	70	{
michael@0	71	if (!cx || !text) {
michael@0	72	DebugDump("%s", "invalid params passed to xpc_DumpEvalInJSStackFrame!\n");
michael@0	73	return false;
michael@0	74	}
michael@0	75
michael@0	76	DebugDump("js[%d]> %s\n", frameno, text);
michael@0	77
michael@0	78	uint32_t num = 0;
michael@0	79
michael@0	80	JSAbstractFramePtr frame = JSNullFramePtr();
michael@0	81
michael@0	82	JSBrokenFrameIterator iter(cx);
michael@0	83	while (!iter.done()) {
michael@0	84	if (num == frameno) {
michael@0	85	frame = iter.abstractFramePtr();
michael@0	86	break;
michael@0	87	}
michael@0	88	++iter;
michael@0	89	num++;
michael@0	90	}
michael@0	91
michael@0	92	if (!frame) {
michael@0	93	DebugDump("%s", "invalid frame number!\n");
michael@0	94	return false;
michael@0	95	}
michael@0	96
michael@0	97	JS::AutoSaveExceptionState exceptionState(cx);
michael@0	98	JSErrorReporter older = JS_SetErrorReporter(cx, xpcDumpEvalErrorReporter);
michael@0	99
michael@0	100	JS::RootedValue rval(cx);
michael@0	101	JSString* str;
michael@0	102	JSAutoByteString bytes;
michael@0	103	if (frame.evaluateInStackFrame(cx, text, strlen(text), "eval", 1, &rval) &&
michael@0	104	nullptr != (str = ToString(cx, rval)) &&
michael@0	105	bytes.encodeLatin1(cx, str)) {
michael@0	106	DebugDump("%s\n", bytes.ptr());
michael@0	107	} else {
michael@0	108	DebugDump("%s", "eval failed!\n");
michael@0	109	}
michael@0	110
michael@0	111	JS_SetErrorReporter(cx, older);
michael@0	112	exceptionState.restore();
michael@0	113	return true;
michael@0	114	}
michael@0	115
michael@0	116	/***************************************************************************/
michael@0	117
michael@0	118	JSTrapStatus
michael@0	119	xpc_DebuggerKeywordHandler(JSContext *cx, JSScript *script, jsbytecode *pc,
michael@0	120	jsval *rval, void *closure)
michael@0	121	{
michael@0	122	static const char line[] =
michael@0	123	"------------------------------------------------------------------------\n";
michael@0	124	DebugDump("%s", line);
michael@0	125	DebugDump("%s", "Hit JavaScript \"debugger\" keyword. JS call stack...\n");
michael@0	126	xpc_DumpJSStack(cx, true, true, false);
michael@0	127	DebugDump("%s", line);
michael@0	128	return JSTRAP_CONTINUE;
michael@0	129	}
michael@0	130
michael@0	131	bool xpc_InstallJSDebuggerKeywordHandler(JSRuntime* rt)
michael@0	132	{
michael@0	133	return JS_SetDebuggerHandler(rt, xpc_DebuggerKeywordHandler, nullptr);
michael@0	134	}