Herman Venter
f9197ff35c
This is a rather mechanical refactor that uses references (&) rather than pointers (*) for parameters that are not permitted to ever be given null arguments. In effect, the onus for checking null pointers is shifted from the callee to the caller. The & type annotation makes it clear that the callee is not prepared to deal with a null pointer.
568 linhas
20 KiB
C++
568 linhas
20 KiB
C++
/*
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+----------------------------------------------------------------------+
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| HipHop for PHP |
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+----------------------------------------------------------------------+
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| Copyright (c) 2010- Facebook, Inc. (http://www.facebook.com) |
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+----------------------------------------------------------------------+
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| This source file is subject to version 3.01 of the PHP license, |
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| that is bundled with this package in the file LICENSE, and is |
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| available through the world-wide-web at the following url: |
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| http://www.php.net/license/3_01.txt |
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| If you did not receive a copy of the PHP license and are unable to |
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| obtain it through the world-wide-web, please send a note to |
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| license@php.net so we can mail you a copy immediately. |
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+----------------------------------------------------------------------+
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*/
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#include "hphp/runtime/eval/debugger/cmd/cmd_break.h"
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namespace HPHP { namespace Eval {
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///////////////////////////////////////////////////////////////////////////////
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TRACE_SET_MOD(debugger);
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// Serializes this command into the given Thrift buffer.
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void CmdBreak::sendImpl(DebuggerThriftBuffer &thrift) {
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// m_breakpoints is initially set to the breakpoints collection of the
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// client (in validate, which indirectly calls sendImpl). When received
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// via Thrift, m_breakpoints points to a copy that is placed in m_bps.
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assert(m_breakpoints);
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DebuggerCommand::sendImpl(thrift);
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BreakPointInfo::SendImpl(*m_breakpoints, thrift);
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}
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// Deserializes a CmdBreak from the given Thrift buffer.
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void CmdBreak::recvImpl(DebuggerThriftBuffer &thrift) {
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DebuggerCommand::recvImpl(thrift);
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BreakPointInfo::RecvImpl(m_bps, thrift);
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}
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// Informs the client of all strings that may follow a break command.
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// Used for auto completion. The client uses the prefix of the argument
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// following the command to narrow down the list displayed to the user.
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void CmdBreak::list(DebuggerClient &client) {
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if (client.argCount() == 0 ||
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(client.argCount() == 1 &&
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(client.arg(1, "regex") || client.arg(1, "once")))) {
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static const char *keywords1[] = {
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"regex",
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"once",
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"start",
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"end",
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"psp",
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"list",
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"clear",
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"toggle",
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"enable",
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"disable",
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nullptr
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};
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client.addCompletion(keywords1);
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client.addCompletion(DebuggerClient::AutoCompleteFileNames);
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client.addCompletion(DebuggerClient::AutoCompleteFunctions);
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client.addCompletion(DebuggerClient::AutoCompleteClasses);
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client.addCompletion(DebuggerClient::AutoCompleteClassMethods);
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} else if (client.argCount() == 1) {
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if (hasStatusChangeArg(client)) {
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client.addCompletion("all");
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} else if (!client.arg(1, "list")) {
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client.addCompletion(DebuggerClient::AutoCompleteFileNames);
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}
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} else {
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client.addCompletion(DebuggerClient::AutoCompleteCode);
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}
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}
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// The text to display when the debugger client processes "help break".
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void CmdBreak::help(DebuggerClient &client) {
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client.helpTitle("Break Command");
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client.helpCmds(
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"[b]reak", "breaks at current line of code",
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"[b]reak {exp}", "breaks at matching location",
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"", "",
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"[b]reak [o]nce {above}", "breaks just once then disables it",
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"", "",
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"[b]reak [s]tart {url}", "breaks at start of web request",
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"[b]reak [e]nd {url}", "breaks at end of web request",
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"[b]reak [p]sp {url}", "breaks at end of psp",
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"", "",
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"[b]reak {above} if {php}", "breaks if condition meets",
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"[b]reak {above} && {php}", "breaks and evaluates an expression",
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"", "",
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"[b]reak [l]ist", "lists all breakpoints",
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"[b]reak [c]lear {index}", "clears the n-th breakpoint on list",
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"[b]reak [c]lear [a]ll", "clears all breakpoints",
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"[b]reak [c]lear", "clears current breakpoint",
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"[b]reak [t]oggle {index}", "toggles the n-th breakpoint on list",
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"[b]reak [t]oggle [a]ll", "toggles all breakpoints",
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"[b]reak [t]oggle", "toggles current breakpoint",
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"[b]reak [e]nable {index}", "enables the n-th breakpoint on list",
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"[b]reak [e]nable [a]ll", "enables all breakpoints",
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"[b]reak [e]nable", "enables current breakpoint",
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"[b]reak [d]isable {index}","disables the n-th breakpoint on list",
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"[b]reak [d]isable [a]ll", "disables all breakpoints",
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"[b]reak [d]isable", "disables current breakpoint",
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nullptr
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);
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client.helpTitle("Where to break?");
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client.helpSection(
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"There are many ways to specify a source file location to set a "
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"breakpoint, but it's ONE single string without whitespaces. The "
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"format looks like this,\n"
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"\n"
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"\tfile location: {file}:{line}\n"
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"\tfunction call: {func}()\n"
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"\tmethod invoke: {cls}::{method}()\n"
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"\n"
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"For examples,\n"
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"\n"
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"\tb mypage.php:123\n"
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"\tb foo()\n"
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"\tb MyClass::foo()\n"
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);
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client.helpTitle("Special Breakpoints");
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client.helpSection(
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"There are special breakpoints what can only be set by names:\n"
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"\n"
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"\tstart\n"
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"\tend\n"
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"\tpsp\n"
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"\n"
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"They represent different time points of a web request. 'start' is at the "
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"beginning of a web request, when no PHP file is invoked yet, but query "
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"string and server variables are already prepared. 'end' is at the end of "
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"a web request, but BEFORE post-send processing (psp). 'psp' is at END of "
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"psp, not beginning. To set a breakpoint at the beginning of psp, use "
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"'end', because end of a request is the same as beginning of psp."
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);
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client.helpTitle("Conditional Breakpoints and Watchpoints");
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client.helpSection(
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"Every breakpoint can specify a condition, which is an arbitrary PHP "
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"expression that will be evaluated to TRUE or FALSE. When TRUE, it will "
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"break. When FALSE, it will continue without break. \"&&\" is similar to "
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"\"if\", except it will always break, regardless what the expression "
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"returns. This is useful to watch variables at breakpoints. For example,\n"
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"\n"
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"\tb mypage.php:123 && print $a\n"
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"\n"
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"So every time it breaks at mypage.php line 123, it will print out $a."
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);
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client.helpTitle("Breakpoint States and List");
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client.helpSection(
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"Every breakpoint has 3 states: ALWAYS, ONCE, DISABLED. Without keyword "
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"\"once\", a breakpoint is in ALWAYS state. ONCE breakpoints will turn "
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"into DISABLED after it's hit once. DISABLED breakpoints will not break, "
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"but they are kept in the list, so one can run 'b l' command and 'b t' "
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"command to toggle their states.\n"
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"\n"
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"Use '[b]reak [l]ist' command to view indices of different breakpoints. "
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"Then use those indices to clear or toggle their states. This list of "
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"breakpoints and their states will remain the same when switching to "
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"different machines, sandboxes and threads."
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);
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client.helpTitle("Hard Breakpoints");
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client.helpSection(
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"From within PHP code, you can place a function call hphpd_break() to "
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"embed a breakpoint. You may also specify a condition as the function's "
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"parameter, so it breaks when the condition is met. Please read about "
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"this function for more details with '[i]nfo hphpd_break'."
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);
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client.help("");
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}
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// Carries out the "break list" command.
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void CmdBreak::processList(DebuggerClient &client) {
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m_breakpoints = client.getBreakPoints();
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for (int i = 0; i < (int)m_breakpoints->size(); i++) {
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BreakPointInfoPtr bpi = m_breakpoints->at(i);
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client.print(" %d\t%s %s", bpi->index(), bpi->state(true).c_str(),
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bpi->desc().c_str());
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}
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if (m_breakpoints->empty()) {
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client.tutorial(
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"Use '[b]reak ?|[h]elp' to read how to set breakpoints. "
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);
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} else {
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client.tutorial(
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"Use '[b]reak [c]lear {index}|[a]ll' to remove breakpoint(s). "
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"Use '[b]reak [t]oggle {index}|[a]ll' to change their states."
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);
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}
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}
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// Carries out commands that change the status of a breakpoint.
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void CmdBreak::processStatusChange(DebuggerClient &client) {
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m_breakpoints = client.getBreakPoints();
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if (m_breakpoints->empty()) {
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client.error("There is no breakpoint to clear or toggle.");
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client.tutorial(
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"Use '[b]reak ?|[h]elp' to read how to set breakpoints. "
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);
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return;
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}
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if (client.argCount() == 1) {
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BreakPointInfoPtrVec *matched = client.getMatchedBreakPoints();
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BreakPointInfoPtrVec *bps = client.getBreakPoints();
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bool found = false;
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for (unsigned int i = 0; i < matched->size(); i++) {
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BreakPointInfoPtr bpm = (*matched)[i];
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BreakPointInfoPtr bp;
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int index = 0;
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for (; index < (int)bps->size(); index++) {
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if (bpm->same((*bps)[index])) {
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bp = (*bps)[index];
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break;
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}
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}
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if (bp) {
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const char *action;
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if (hasClearArg(client)) {
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action = "cleared";
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bps->erase(bps->begin() + index);
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} else if (hasEnableArg(client)) {
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action = "updated";
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bp->setState(BreakPointInfo::Always);
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} else if (hasDisableArg(client)) {
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action = "updated";
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bp->setState(BreakPointInfo::Disabled);
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} else {
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assert(hasToggleArg(client));
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action = "updated";
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bp->toggle();
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}
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client.info("Breakpoint %d is %s %s", bp->index(),
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action, bp->site().c_str());
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found = true;
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}
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}
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if (found) {
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updateServer(client);
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return;
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}
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client.error("There is no current breakpoint to clear or toggle.");
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return;
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}
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if (client.arg(2, "all")) {
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if (hasClearArg(client)) {
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m_breakpoints->clear();
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updateServer(client);
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client.info("All breakpoints are cleared.");
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return;
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}
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for (unsigned int i = 0; i < m_breakpoints->size(); i++) {
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BreakPointInfoPtr bpi = (*m_breakpoints)[i];
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if (hasEnableArg(client)) {
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bpi->setState(BreakPointInfo::Always);
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}
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else if (hasDisableArg(client)) {
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bpi->setState(BreakPointInfo::Disabled);
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}
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else {
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assert(hasToggleArg(client));
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bpi->toggle();
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}
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}
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updateServer(client);
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return processList(client);
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}
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string snum = client.argValue(2);
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if (!DebuggerClient::IsValidNumber(snum)) {
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client.error("'[b]reak [c]lear|[t]oggle' needs an {index} argument.");
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client.tutorial(
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"You will have to run '[b]reak [l]ist' first to see a list of valid "
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"numbers or indices to specify."
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);
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return;
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}
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int index = -1;
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int num = atoi(snum.c_str());
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for (unsigned int i = 0; i < m_breakpoints->size(); i++) {
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if (m_breakpoints->at(i)->index() == num) {
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index = i;
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break;
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}
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}
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if (index < 0) {
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client.error("\"%s\" is not a valid breakpoint index. Choose one from "
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"this list:", snum.c_str());
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processList(client);
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return;
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}
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BreakPointInfoPtr bpi = (*m_breakpoints)[index];
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if (hasClearArg(client)) {
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m_breakpoints->erase(m_breakpoints->begin() + index);
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updateServer(client);
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client.info("Breakpoint %d cleared %s", bpi->index(),
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bpi->desc().c_str());
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} else if (hasEnableArg(client)) {
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bpi->setState(BreakPointInfo::Always);
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updateServer(client);
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client.info("Breakpoint %d's state is changed to %s.", bpi->index(),
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bpi->state(false).c_str());
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} else if (hasDisableArg(client)) {
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bpi->setState(BreakPointInfo::Disabled);
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updateServer(client);
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client.info("Breakpoint %d's state is changed to %s.", bpi->index(),
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bpi->state(false).c_str());
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} else {
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assert(hasToggleArg(client));
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bpi->toggle();
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updateServer(client);
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client.info("Breakpoint %d's state is changed to %s.", bpi->index(),
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bpi->state(false).c_str());
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}
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}
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// Uses the client to send this command to the server, which
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// will update its breakpoint list with the one in this command.
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// The client will block until the server echoes
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// this command back to it. The echoed command is discarded.
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bool CmdBreak::updateServer(DebuggerClient &client) {
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m_body = "update";
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client.xend<CmdBreak>(this);
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return true;
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}
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// Creates a new CmdBreak instance, sets its breakpoints to the client's
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// list, sends the command to the server and waits for a response.
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bool CmdBreak::SendClientBreakpointListToServer(DebuggerClient &client) {
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auto cmd = CmdBreak();
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cmd.m_breakpoints = client.getBreakPoints();
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return cmd.updateServer(client);
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}
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// Adds conditional or watch clause to the breakpoint info if needed.
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// Then adds the breakpoint to client's list and sends this command
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// to the server so that it too can update it's list.
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// Returns false if the breakpoint is not well formed.
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bool CmdBreak::addToBreakpointListAndUpdateServer(
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DebuggerClient &client, BreakPointInfoPtr bpi, int index) {
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++index;
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if (client.arg(index, "if")) {
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bpi->setClause(client.lineRest(++index), true);
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} else if (client.arg(index, "&&")) {
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bpi->setClause(client.lineRest(++index), false);
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}
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if (bpi->valid()) {
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m_breakpoints = client.getBreakPoints();
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for (int i = 0; i < (int)m_breakpoints->size(); i++) {
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if ((*m_breakpoints)[i]->same(bpi)) {
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client.error("Breakpoint was already set previously.");
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return true;
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}
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}
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m_breakpoints->push_back(bpi);
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updateServer(client);
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client.info("Breakpoint %d set %s", bpi->index(), bpi->desc().c_str());
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return true;
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}
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// TODO: keep more detailed error information in the BreakPointInfo
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// and emit that information here. Well, first factor out this code
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// into a separate check and report method and report from there.
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// See task 2368334.
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if (!bpi->m_url.empty()) {
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client.error("@{url} cannot be specified alone.");
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} else {
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client.error("Breakpoint was not set in right format.");
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}
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return false;
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}
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|
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// Carries out the Break command. This always involves an action on the
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// client and usually, but not always, involves the server by sending
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// this command to the server and waiting for its response.
|
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void CmdBreak::onClientImpl(DebuggerClient &client) {
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if (DebuggerCommand::displayedHelp(client)) return;
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bool regex = false;
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BreakPointInfo::State state = BreakPointInfo::Always;
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int index = 1;
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if (client.arg(1, "regex")) {
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regex = true;
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index++;
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} else if (client.arg(1, "once")) {
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state = BreakPointInfo::Once;
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index++;
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} else if (client.arg(1, "list")) {
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processList(client);
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return;
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} else if (hasStatusChangeArg(client)) {
|
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processStatusChange(client);
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return;
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}
|
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|
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string currentFile;
|
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int currentLine = 0;
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BreakPointInfoPtr loc = client.getCurrentLocation();
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if (loc) {
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currentFile = loc->m_file;
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currentLine = loc->m_line1;
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}
|
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|
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BreakPointInfoPtr bpi;
|
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InterruptType interrupt = (InterruptType)(-1);
|
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|
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if (client.argCount() == 0) {
|
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if (currentFile.empty() || currentLine == 0) {
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client.error("There is no current file or line to set breakpoint. "
|
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"You will have to specify source file location yourself.");
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return;
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}
|
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bpi = BreakPointInfoPtr(new BreakPointInfo(regex, state,
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currentFile.c_str(),
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currentLine));
|
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} else if (client.arg(index, "start")) {
|
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interrupt = RequestStarted;
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} else if (client.arg(index, "end")) {
|
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interrupt = RequestEnded;
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} else if (client.arg(index, "psp")) {
|
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interrupt = PSPEnded;
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} else {
|
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bpi = BreakPointInfoPtr(new BreakPointInfo(regex, state, BreakPointReached,
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client.argValue(index),
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currentFile));
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}
|
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|
|
if (interrupt >= 0) {
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string url;
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if (!client.arg(index + 1, "if") && !client.arg(index + 1, "&&")) {
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url = client.argValue(++index);
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}
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bpi = BreakPointInfoPtr(new BreakPointInfo(regex, state, interrupt, url));
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}
|
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|
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if (!addToBreakpointListAndUpdateServer(client, bpi, index)) {
|
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client.tutorial(
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"This is the order of different arguments:\n"
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"\n"
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|
"\t[b]reak [o]nce {exp} if|&& {php}\n"
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|
"\n"
|
|
"These are the components in a breakpoint {exp}:\n"
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"\n"
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"\tfile location: {file}:{line}\n"
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"\tfunction call: {func}()\n"
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"\tmethod invoke: {cls}::{method}()\n"
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);
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}
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}
|
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|
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static const StaticString s_id("id");
|
|
static const StaticString s_state("state");
|
|
static const StaticString s_is_exception("is_exception");
|
|
static const StaticString s_exception_class("exception_class");
|
|
static const StaticString s_file("file");
|
|
static const StaticString s_line1("line1");
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|
static const StaticString s_line2("line2");
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|
static const StaticString s_namespace("namespace");
|
|
static const StaticString s_func("func");
|
|
static const StaticString s_class("class");
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static const StaticString s_url("url");
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static const StaticString s_use_regex("use_regex");
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static const StaticString s_clause_type("clause_type");
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static const StaticString s_clause("clause");
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static const StaticString s_if("if");
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static const StaticString s_ampamp("ampamp");
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static const StaticString s_desc("desc");
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// Updates the client with information about the execution of this command.
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// This information is not used by the command line client, but can be accessed
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// via the debugger client API exposed to PHP programs.
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void CmdBreak::setClientOutput(DebuggerClient &client) {
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// Output an array of current breakpoints including exceptions
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client.setOutputType(DebuggerClient::OTValues);
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Array values;
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m_breakpoints = client.getBreakPoints();
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for (int i = 0; i < (int)m_breakpoints->size(); i++) {
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BreakPointInfoPtr bpi = m_breakpoints->at(i);
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Array breakpoint;
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breakpoint.set(s_id, bpi->index());
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breakpoint.set(s_state, bpi->state(false));
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if (bpi->m_interrupt == ExceptionThrown) {
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breakpoint.set(s_is_exception, true);
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breakpoint.set(s_exception_class, bpi->getExceptionClass());
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} else {
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breakpoint.set(s_is_exception, false);
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breakpoint.set(s_file, bpi->m_file);
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breakpoint.set(s_line1, bpi->m_line1);
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breakpoint.set(s_line2, bpi->m_line2);
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breakpoint.set(s_namespace, bpi->getNamespace());
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breakpoint.set(s_func, bpi->getFunction());
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breakpoint.set(s_class, bpi->getClass());
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}
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breakpoint.set(s_url, bpi->m_url);
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breakpoint.set(s_use_regex, bpi->m_regex);
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breakpoint.set(s_clause_type, bpi->m_check ? s_if : s_ampamp);
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breakpoint.set(s_clause, bpi->m_clause);
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breakpoint.set(s_desc, bpi->desc());
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values.append(breakpoint);
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}
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client.setOTValues(values);
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}
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// Updates the breakpoint list in the proxy with the new list
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// received from the client. Then sends the command back to the
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// client as confirmation. Returns false if the confirmation message
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// send failed.
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bool CmdBreak::onServer(DebuggerProxy &proxy) {
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if (m_body == "update") {
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proxy.setBreakPoints(m_bps);
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m_breakpoints = &m_bps;
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return proxy.sendToClient(this);
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}
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return false;
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}
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// Returns true if the last command parsed by the client has
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// an argument that changes the status of a breakpoint.
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// I.e. clear, enable, disable or toggle.
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bool CmdBreak::hasStatusChangeArg(DebuggerClient &client) {
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return
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hasClearArg(client) || hasEnableArg(client) ||
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hasDisableArg(client) || hasToggleArg(client);
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}
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// Returns true if the last command parsed by the client has
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// the string "enable" in its first argument position.
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bool CmdBreak::hasEnableArg(DebuggerClient &client) {
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return client.arg(1, "enable");
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}
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// Returns true if the last command parsed by the client has
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// the string "disable" in its first argument position.
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bool CmdBreak::hasDisableArg(DebuggerClient &client) {
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return client.arg(1, "disable");
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}
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// Returns true if the last command parsed by the client has
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// the string "clear" in its first argument position.
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bool CmdBreak::hasClearArg(DebuggerClient &client) {
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return client.arg(1, "clear");
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}
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// Returns true if the last command parsed by the client has
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// the string "toggle" in its first argument position.
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bool CmdBreak::hasToggleArg(DebuggerClient &client) {
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return client.arg(1, "toggle");
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}
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///////////////////////////////////////////////////////////////////////////////
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}}
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