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+/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+ * vim: set ts=8 sw=4 et tw=80:
+ *
+ * ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * Copyright (C) 2007 Sun Microsystems, Inc. All Rights Reserved.
+ *
+ * Contributor(s):
+ * Brendan Eich <brendan@mozilla.org>
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either of the GNU General Public License Version 2 or later (the "GPL"),
+ * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+#include "jsapi.h"
+#include "jsutil.h"
+#include "jsatom.h"
+#include "jscntxt.h"
+#include "jsdbgapi.h"
+#include "jsfun.h"
+#include "jsinterp.h"
+#include "jsobj.h"
+#include "jsscript.h"
+#include "jsstr.h"
+
+#include "jsdtracef.h"
+#include <sys/types.h>
+
+#define TYPEOF(cx,v) (JSVAL_IS_NULL(v) ? JSTYPE_NULL : JS_TypeOfValue(cx,v))
+
+static char dempty[] = "<null>";
+
+char *
+jsdtrace_funcclass_name(JSFunction *fun)
+{
+ return (!FUN_INTERPRETED(fun) &&
+ !(fun->flags & JSFUN_TRACEABLE) &&
+ FUN_CLASP(fun))
+ ? (char *)FUN_CLASP(fun)->name
+ : dempty;
+}
+
+char *
+jsdtrace_filename(JSStackFrame *fp)
+{
+ while (fp && fp->script == NULL)
+ fp = fp->down;
+ return (fp && fp->script && fp->script->filename)
+ ? (char *)fp->script->filename
+ : dempty;
+}
+
+int
+jsdtrace_linenumber(JSContext *cx, JSStackFrame *fp)
+{
+ while (fp && fp->script == NULL)
+ fp = fp->down;
+ return (fp && fp->regs)
+ ? (int) js_PCToLineNumber(cx, fp->script, fp->regs->pc)
+ : -1;
+}
+
+/*
+ * This function is used to convert function arguments and return value (jsval)
+ * into the following based on each value's type tag:
+ *
+ * jsval returned
+ * -------------------
+ * STRING -> char *
+ * INT -> int
+ * DOUBLE -> double *
+ * BOOLEAN -> int
+ * OBJECT -> void *
+ *
+ * All are presented as void * for DTrace consumers to use, after shifting or
+ * masking out the JavaScript type bits. This allows D scripts to use ints and
+ * booleans directly and copyinstr() for string arguments, when types are known
+ * beforehand.
+ *
+ * This is used by the function-args and function-rval probes, which also
+ * provide raw (unmasked) jsvals should type info be useful from D scripts.
+ */
+void *
+jsdtrace_jsvaltovoid(JSContext *cx, jsval argval)
+{
+ JSType type = TYPEOF(cx, argval);
+
+ switch (type) {
+ case JSTYPE_NULL:
+ case JSTYPE_VOID:
+ return (void *)JS_TYPE_STR(type);
+
+ case JSTYPE_BOOLEAN:
+ return (void *)JSVAL_TO_BOOLEAN(argval);
+
+ case JSTYPE_STRING:
+ return (void *)js_GetStringBytes(cx, JSVAL_TO_STRING(argval));
+
+ case JSTYPE_NUMBER:
+ if (JSVAL_IS_INT(argval))
+ return (void *)JSVAL_TO_INT(argval);
+ return JSVAL_TO_DOUBLE(argval);
+
+ default:
+ return JSVAL_TO_GCTHING(argval);
+ }
+ /* NOTREACHED */
+}
+
+char *
+jsdtrace_function_name(JSContext *cx, JSStackFrame *fp, JSFunction *fun)
+{
+ JSAtom *atom;
+ JSFrameRegs *regs;
+ JSScript *script;
+ jsbytecode *pc;
+ char *name;
+
+ atom = fun->atom;
+ if (!atom) {
+ if (fp->fun != fun || !fp->down)
+ return dempty;
+
+ regs = fp->down->regs;
+ if (!regs)
+ return dempty;
+
+ /*
+ * An anonymous function called from an active script or interpreted
+ * function: try to fetch the variable or property name by which the
+ * anonymous function was invoked.
+ */
+ pc = regs->pc;
+ script = fp->down->script;
+ switch ((JSOp) *pc) {
+ case JSOP_CALL:
+ case JSOP_EVAL:
+ JS_ASSERT(fp->argv == regs->sp - (int)GET_ARGC(pc));
+
+ /*
+ * FIXME bug 422864: update this code to use the pc stack from the
+ * decompiler.
+ */
+ break;
+ default: ;
+ }
+
+ switch ((JSOp) *pc) {
+ case JSOP_CALLNAME:
+ case JSOP_CALLPROP:
+ case JSOP_NAME:
+ case JSOP_SETNAME:
+ case JSOP_GETPROP:
+ case JSOP_SETPROP:
+ GET_ATOM_FROM_BYTECODE(script, pc, 0, atom);
+ break;
+
+ case JSOP_CALLELEM:
+ case JSOP_GETELEM:
+ case JSOP_SETELEM:
+ case JSOP_CALLGVAR:
+ case JSOP_GETGVAR:
+ case JSOP_SETGVAR:
+ case JSOP_CALLARG:
+ case JSOP_CALLLOCAL:
+ /* FIXME: try to recover a name from these ops. */
+ /* FALL THROUGH */
+
+ default:
+ return dempty;
+ }
+ }
+
+ name = (char *)js_GetStringBytes(cx, ATOM_TO_STRING(atom));
+ return name ? name : dempty;
+}
+
+/*
+ * These functions call the DTrace macros for the JavaScript USDT probes.
+ * Originally this code was inlined in the JavaScript code; however since
+ * a number of operations are called, these have been placed into functions
+ * to reduce any negative compiler optimization effect that the addition of
+ * a number of usually unused lines of code would cause.
+ */
+void
+jsdtrace_function_entry(JSContext *cx, JSStackFrame *fp, JSFunction *fun)
+{
+ JAVASCRIPT_FUNCTION_ENTRY(
+ jsdtrace_filename(fp),
+ jsdtrace_funcclass_name(fun),
+ jsdtrace_function_name(cx, fp, fun)
+ );
+}
+
+void
+jsdtrace_function_info(JSContext *cx, JSStackFrame *fp, JSStackFrame *dfp,
+ JSFunction *fun)
+{
+ JAVASCRIPT_FUNCTION_INFO(
+ jsdtrace_filename(fp),
+ jsdtrace_funcclass_name(fun),
+ jsdtrace_function_name(cx, fp, fun),
+ fp->script->lineno,
+ jsdtrace_filename(dfp),
+ jsdtrace_linenumber(cx, dfp)
+ );
+}
+
+void
+jsdtrace_function_args(JSContext *cx, JSStackFrame *fp, JSFunction *fun)
+{
+ JAVASCRIPT_FUNCTION_ARGS(
+ jsdtrace_filename(fp),
+ jsdtrace_funcclass_name(fun),
+ jsdtrace_function_name(cx, fp, fun),
+ fp->argc, (void *)fp->argv,
+ (fp->argc > 0) ? jsdtrace_jsvaltovoid(cx, fp->argv[0]) : 0,
+ (fp->argc > 1) ? jsdtrace_jsvaltovoid(cx, fp->argv[1]) : 0,
+ (fp->argc > 2) ? jsdtrace_jsvaltovoid(cx, fp->argv[2]) : 0,
+ (fp->argc > 3) ? jsdtrace_jsvaltovoid(cx, fp->argv[3]) : 0,
+ (fp->argc > 4) ? jsdtrace_jsvaltovoid(cx, fp->argv[4]) : 0
+ );
+}
+
+void
+jsdtrace_function_rval(JSContext *cx, JSStackFrame *fp, JSFunction *fun)
+{
+ JAVASCRIPT_FUNCTION_RVAL(
+ jsdtrace_filename(fp),
+ jsdtrace_funcclass_name(fun),
+ jsdtrace_function_name(cx, fp, fun),
+ jsdtrace_linenumber(cx, fp), (void *)fp->rval,
+ jsdtrace_jsvaltovoid(cx, fp->rval)
+ );
+}
+
+void
+jsdtrace_function_return(JSContext *cx, JSStackFrame *fp, JSFunction *fun)
+{
+ JAVASCRIPT_FUNCTION_RETURN(
+ jsdtrace_filename(fp),
+ jsdtrace_funcclass_name(fun),
+ jsdtrace_function_name(cx, fp, fun)
+ );
+}
+
+void
+jsdtrace_object_create_start(JSStackFrame *fp, JSClass *clasp)
+{
+ JAVASCRIPT_OBJECT_CREATE_START(jsdtrace_filename(fp), (char *)clasp->name);
+}
+
+void
+jsdtrace_object_create_done(JSStackFrame *fp, JSClass *clasp)
+{
+ JAVASCRIPT_OBJECT_CREATE_DONE(jsdtrace_filename(fp), (char *)clasp->name);
+}
+
+void
+jsdtrace_object_create(JSContext *cx, JSClass *clasp, JSObject *obj)
+{
+ JAVASCRIPT_OBJECT_CREATE(
+ jsdtrace_filename(cx->fp),
+ (char *)clasp->name,
+ (uintptr_t)obj,
+ jsdtrace_linenumber(cx, cx->fp)
+ );
+}
+
+void
+jsdtrace_object_finalize(JSObject *obj)
+{
+ JSClass *clasp;
+
+ clasp = LOCKED_OBJ_GET_CLASS(obj);
+
+ /* the first arg is NULL - reserved for future use (filename?) */
+ JAVASCRIPT_OBJECT_FINALIZE(NULL, (char *)clasp->name, (uintptr_t)obj);
+}
+
+void
+jsdtrace_execute_start(JSScript *script)
+{
+ JAVASCRIPT_EXECUTE_START(
+ script->filename ? (char *)script->filename : dempty,
+ script->lineno
+ );
+}
+
+void
+jsdtrace_execute_done(JSScript *script)
+{
+ JAVASCRIPT_EXECUTE_DONE(
+ script->filename ? (char *)script->filename : dempty,
+ script->lineno
+ );
+}
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