mirror of
https://github.com/neovim/neovim.git
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0cb90114d4
Problem: Buffer underflow with unexpected :finally.
Solution: Check CSF_TRY can be found.
96b9bf8f74
Co-authored-by: Bram Moolenaar <Bram@vim.org>
2008 lines
69 KiB
C
2008 lines
69 KiB
C
// This is an open source non-commercial project. Dear PVS-Studio, please check
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// it. PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
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/// @file ex_eval.c
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///
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/// Functions for Ex command line for the +eval feature.
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#include <assert.h>
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#include <inttypes.h>
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#include <limits.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <string.h>
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#include "nvim/ascii.h"
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#include "nvim/charset.h"
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#include "nvim/debugger.h"
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#include "nvim/eval.h"
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#include "nvim/eval/typval.h"
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#include "nvim/eval/typval_defs.h"
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#include "nvim/eval/userfunc.h"
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#include "nvim/ex_cmds_defs.h"
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#include "nvim/ex_docmd.h"
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#include "nvim/ex_eval.h"
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#include "nvim/ex_eval_defs.h"
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#include "nvim/gettext.h"
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#include "nvim/globals.h"
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#include "nvim/memory.h"
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#include "nvim/message.h"
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#include "nvim/option_defs.h"
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#include "nvim/pos.h"
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#include "nvim/regexp.h"
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#include "nvim/runtime.h"
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#include "nvim/strings.h"
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#include "nvim/types.h"
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#include "nvim/vim.h"
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#ifdef INCLUDE_GENERATED_DECLARATIONS
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# include "ex_eval.c.generated.h"
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#endif
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// Exception handling terms:
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//
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// :try ":try" command ─┐
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// ... try block │
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// :catch RE ":catch" command │
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// ... catch clause ├─ try conditional
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// :finally ":finally" command │
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// ... finally clause │
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// :endtry ":endtry" command ─┘
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//
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// The try conditional may have any number of catch clauses and at most one
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// finally clause. A ":throw" command can be inside the try block, a catch
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// clause, the finally clause, or in a function called or script sourced from
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// there or even outside the try conditional. Try conditionals may be nested.
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// Configuration whether an exception is thrown on error or interrupt. When
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// the preprocessor macros below evaluate to false, an error (did_emsg) or
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// interrupt (got_int) under an active try conditional terminates the script
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// after the non-active finally clauses of all active try conditionals have been
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// executed. Otherwise, errors and/or interrupts are converted into catchable
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// exceptions (did_throw additionally set), which terminate the script only if
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// not caught. For user exceptions, only did_throw is set. (Note: got_int can
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// be set asynchronously afterwards by a SIGINT, so did_throw && got_int is not
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// a reliant test that the exception currently being thrown is an interrupt
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// exception. Similarly, did_emsg can be set afterwards on an error in an
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// (unskipped) conditional command inside an inactive conditional, so did_throw
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// && did_emsg is not a reliant test that the exception currently being thrown
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// is an error exception.) - The macros can be defined as expressions checking
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// for a variable that is allowed to be changed during execution of a script.
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// Values used for the Vim release.
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#define THROW_ON_ERROR true
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#define THROW_ON_ERROR_TRUE
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#define THROW_ON_INTERRUPT true
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#define THROW_ON_INTERRUPT_TRUE
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// Don't do something after an error, interrupt, or throw, or when
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// there is a surrounding conditional and it was not active.
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#define CHECK_SKIP \
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(did_emsg \
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|| got_int \
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|| did_throw \
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|| (cstack->cs_idx > 0 \
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&& !(cstack->cs_flags[cstack->cs_idx - 1] & CSF_ACTIVE)))
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static void discard_pending_return(typval_T *p)
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{
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tv_free(p);
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}
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// When several errors appear in a row, setting "force_abort" is delayed until
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// the failing command returned. "cause_abort" is set to true meanwhile, in
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// order to indicate that situation. This is useful when "force_abort" was set
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// during execution of a function call from an expression: the aborting of the
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// expression evaluation is done without producing any error messages, but all
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// error messages on parsing errors during the expression evaluation are given
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// (even if a try conditional is active).
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static int cause_abort = false;
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/// @return true when immediately aborting on error, or when an interrupt
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/// occurred or an exception was thrown but not caught.
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///
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/// Use for ":{range}call" to check whether an aborted function that does not
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/// handle a range itself should be called again for the next line in the range.
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/// Also used for cancelling expression evaluation after a function call caused
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/// an immediate abort. Note that the first emsg() call temporarily resets
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/// "force_abort" until the throw point for error messages has been reached.
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/// That is, during cancellation of an expression evaluation after an aborting
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/// function call or due to a parsing error, aborting() always returns the same
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/// value. "got_int" is also set by calling interrupt().
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int aborting(void)
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{
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return (did_emsg && force_abort) || got_int || did_throw;
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}
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/// The value of "force_abort" is temporarily reset by the first emsg() call
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/// during an expression evaluation, and "cause_abort" is used instead. It might
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/// be necessary to restore "force_abort" even before the throw point for the
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/// error message has been reached. update_force_abort() should be called then.
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void update_force_abort(void)
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{
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if (cause_abort) {
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force_abort = true;
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}
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}
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/// @return true if a command with a subcommand resulting in "retcode" should
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/// abort the script processing. Can be used to suppress an autocommand after
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/// execution of a failing subcommand as long as the error message has not been
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/// displayed and actually caused the abortion.
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int should_abort(int retcode)
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{
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return (retcode == FAIL && trylevel != 0 && !emsg_silent) || aborting();
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}
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/// @return true if a function with the "abort" flag should not be considered
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/// ended on an error. This means that parsing commands is continued in order
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/// to find finally clauses to be executed, and that some errors in skipped
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/// commands are still reported.
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int aborted_in_try(void)
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FUNC_ATTR_PURE
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{
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// This function is only called after an error. In this case, "force_abort"
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// determines whether searching for finally clauses is necessary.
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return force_abort;
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}
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/// cause_errthrow(): Cause a throw of an error exception if appropriate.
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///
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/// @return true if the error message should not be displayed by emsg().
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///
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/// Sets "ignore", if the emsg() call should be ignored completely.
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///
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/// When several messages appear in the same command, the first is usually the
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/// most specific one and used as the exception value. The "severe" flag can be
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/// set to true, if a later but severer message should be used instead.
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bool cause_errthrow(const char *mesg, bool severe, bool *ignore)
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FUNC_ATTR_NONNULL_ALL
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{
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msglist_T *elem;
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msglist_T **plist;
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// Do nothing when displaying the interrupt message or reporting an
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// uncaught exception (which has already been discarded then) at the top
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// level. Also when no exception can be thrown. The message will be
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// displayed by emsg().
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if (suppress_errthrow) {
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return false;
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}
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// If emsg() has not been called previously, temporarily reset
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// "force_abort" until the throw point for error messages has been
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// reached. This ensures that aborting() returns the same value for all
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// errors that appear in the same command. This means particularly that
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// for parsing errors during expression evaluation emsg() will be called
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// multiply, even when the expression is evaluated from a finally clause
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// that was activated due to an aborting error, interrupt, or exception.
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if (!did_emsg) {
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cause_abort = force_abort;
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force_abort = false;
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}
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// If no try conditional is active and no exception is being thrown and
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// there has not been an error in a try conditional or a throw so far, do
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// nothing (for compatibility of non-EH scripts). The message will then
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// be displayed by emsg(). When ":silent!" was used and we are not
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// currently throwing an exception, do nothing. The message text will
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// then be stored to v:errmsg by emsg() without displaying it.
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if (((trylevel == 0 && !cause_abort) || emsg_silent) && !did_throw) {
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return false;
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}
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// Ignore an interrupt message when inside a try conditional or when an
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// exception is being thrown or when an error in a try conditional or
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// throw has been detected previously. This is important in order that an
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// interrupt exception is catchable by the innermost try conditional and
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// not replaced by an interrupt message error exception.
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if (mesg == _(e_interr)) {
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*ignore = true;
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return true;
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}
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// Ensure that all commands in nested function calls and sourced files
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// are aborted immediately.
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cause_abort = true;
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// When an exception is being thrown, some commands (like conditionals) are
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// not skipped. Errors in those commands may affect what of the subsequent
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// commands are regarded part of catch and finally clauses. Catching the
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// exception would then cause execution of commands not intended by the
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// user, who wouldn't even get aware of the problem. Therefore, discard the
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// exception currently being thrown to prevent it from being caught. Just
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// execute finally clauses and terminate.
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if (did_throw) {
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// When discarding an interrupt exception, reset got_int to prevent the
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// same interrupt being converted to an exception again and discarding
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// the error exception we are about to throw here.
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if (current_exception->type == ET_INTERRUPT) {
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got_int = false;
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}
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discard_current_exception();
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}
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#ifdef THROW_TEST
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if (!THROW_ON_ERROR) {
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// Print error message immediately without searching for a matching
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// catch clause; just finally clauses are executed before the script
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// is terminated.
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return false;
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} else // NOLINT(readability/braces)
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#endif
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{
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// Prepare the throw of an error exception, so that everything will
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// be aborted (except for executing finally clauses), until the error
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// exception is caught; if still uncaught at the top level, the error
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// message will be displayed and the script processing terminated
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// then. - This function has no access to the conditional stack.
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// Thus, the actual throw is made after the failing command has
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// returned. - Throw only the first of several errors in a row, except
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// a severe error is following.
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if (msg_list != NULL) {
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plist = msg_list;
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while (*plist != NULL) {
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plist = &(*plist)->next;
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}
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elem = xmalloc(sizeof(msglist_T));
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elem->msg = xstrdup(mesg);
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elem->next = NULL;
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elem->throw_msg = NULL;
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*plist = elem;
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if (plist == msg_list || severe) {
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char *tmsg;
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// Skip the extra "Vim " prefix for message "E458".
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tmsg = elem->msg;
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if (strncmp(tmsg, "Vim E", 5) == 0
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&& ascii_isdigit(tmsg[5])
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&& ascii_isdigit(tmsg[6])
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&& ascii_isdigit(tmsg[7])
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&& tmsg[8] == ':'
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&& tmsg[9] == ' ') {
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(*msg_list)->throw_msg = &tmsg[4];
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} else {
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(*msg_list)->throw_msg = tmsg;
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}
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}
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// Get the source name and lnum now, it may change before
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// reaching do_errthrow().
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elem->sfile = estack_sfile(ESTACK_NONE);
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elem->slnum = SOURCING_LNUM;
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}
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return true;
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}
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}
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/// Free a "msg_list" and the messages it contains.
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static void free_msglist(msglist_T *l)
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{
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msglist_T *messages, *next;
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messages = l;
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while (messages != NULL) {
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next = messages->next;
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xfree(messages->msg);
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xfree(messages->sfile);
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xfree(messages);
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messages = next;
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}
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}
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/// Free global "*msg_list" and the messages it contains, then set "*msg_list"
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/// to NULL.
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void free_global_msglist(void)
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{
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free_msglist(*msg_list);
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*msg_list = NULL;
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}
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/// Throw the message specified in the call to cause_errthrow() above as an
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/// error exception. If cstack is NULL, postpone the throw until do_cmdline()
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/// has returned (see do_one_cmd()).
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void do_errthrow(cstack_T *cstack, char *cmdname)
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{
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// Ensure that all commands in nested function calls and sourced files
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// are aborted immediately.
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if (cause_abort) {
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cause_abort = false;
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force_abort = true;
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}
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// If no exception is to be thrown or the conversion should be done after
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// returning to a previous invocation of do_one_cmd(), do nothing.
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if (msg_list == NULL || *msg_list == NULL) {
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return;
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}
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if (throw_exception(*msg_list, ET_ERROR, cmdname) == FAIL) {
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free_msglist(*msg_list);
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} else {
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if (cstack != NULL) {
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do_throw(cstack);
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} else {
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need_rethrow = true;
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}
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}
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*msg_list = NULL;
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}
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/// do_intthrow(): Replace the current exception by an interrupt or interrupt
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/// exception if appropriate.
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///
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/// @return true if the current exception is discarded or,
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/// false otherwise.
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int do_intthrow(cstack_T *cstack)
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{
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// If no interrupt occurred or no try conditional is active and no exception
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// is being thrown, do nothing (for compatibility of non-EH scripts).
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if (!got_int || (trylevel == 0 && !did_throw)) {
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return false;
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}
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#ifdef THROW_TEST // avoid warning for condition always true
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if (!THROW_ON_INTERRUPT) {
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// The interrupt aborts everything except for executing finally clauses.
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// Discard any user or error or interrupt exception currently being
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// thrown.
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if (did_throw) {
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discard_current_exception();
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}
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} else {
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#endif
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// Throw an interrupt exception, so that everything will be aborted
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// (except for executing finally clauses), until the interrupt exception
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// is caught; if still uncaught at the top level, the script processing
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// will be terminated then. - If an interrupt exception is already
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// being thrown, do nothing.
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if (did_throw) {
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if (current_exception->type == ET_INTERRUPT) {
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return false;
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}
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// An interrupt exception replaces any user or error exception.
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discard_current_exception();
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}
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if (throw_exception("Vim:Interrupt", ET_INTERRUPT, NULL) != FAIL) {
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do_throw(cstack);
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}
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#ifdef THROW_TEST
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}
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#endif
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return true;
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}
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/// Get an exception message that is to be stored in current_exception->value.
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char *get_exception_string(void *value, except_type_T type, char *cmdname, int *should_free)
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{
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char *ret, *mesg;
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char *p, *val;
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if (type == ET_ERROR) {
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*should_free = true;
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mesg = ((msglist_T *)value)->throw_msg;
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if (cmdname != NULL && *cmdname != NUL) {
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size_t cmdlen = strlen(cmdname);
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ret = xstrnsave("Vim(", 4 + cmdlen + 2 + strlen(mesg));
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STRCPY(&ret[4], cmdname);
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STRCPY(&ret[4 + cmdlen], "):");
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val = ret + 4 + cmdlen + 2;
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} else {
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ret = xstrnsave("Vim:", 4 + strlen(mesg));
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val = ret + 4;
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}
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// msg_add_fname may have been used to prefix the message with a file
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// name in quotes. In the exception value, put the file name in
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// parentheses and move it to the end.
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for (p = mesg;; p++) {
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if (*p == NUL
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|| (*p == 'E'
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&& ascii_isdigit(p[1])
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&& (p[2] == ':'
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|| (ascii_isdigit(p[2])
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&& (p[3] == ':'
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|| (ascii_isdigit(p[3])
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&& p[4] == ':')))))) {
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if (*p == NUL || p == mesg) {
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STRCAT(val, mesg); // 'E123' missing or at beginning
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} else {
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// '"filename" E123: message text'
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if (mesg[0] != '"' || p - 2 < &mesg[1]
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|| p[-2] != '"' || p[-1] != ' ') {
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// "E123:" is part of the file name.
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continue;
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}
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STRCAT(val, p);
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p[-2] = NUL;
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snprintf(val + strlen(p), strlen(" (%s)"), " (%s)", &mesg[1]);
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p[-2] = '"';
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}
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break;
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}
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}
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} else {
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*should_free = false;
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ret = value;
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}
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return ret;
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}
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/// Throw a new exception. "value" is the exception string for a
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/// user or interrupt exception, or points to a message list in case of an
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/// error exception.
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///
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/// @return FAIL when out of memory or it was tried to throw an illegal user
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/// exception.
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static int throw_exception(void *value, except_type_T type, char *cmdname)
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{
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except_T *excp;
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int should_free;
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// Disallow faking Interrupt or error exceptions as user exceptions. They
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// would be treated differently from real interrupt or error exceptions
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// when no active try block is found, see do_cmdline().
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if (type == ET_USER) {
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if (strncmp(value, "Vim", 3) == 0
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&& (((char_u *)value)[3] == NUL || ((char_u *)value)[3] == ':'
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|| ((char_u *)value)[3] == '(')) {
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emsg(_("E608: Cannot :throw exceptions with 'Vim' prefix"));
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goto fail;
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}
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}
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excp = xmalloc(sizeof(except_T));
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if (type == ET_ERROR) {
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// Store the original message and prefix the exception value with
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// "Vim:" or, if a command name is given, "Vim(cmdname):".
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excp->messages = (msglist_T *)value;
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}
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excp->value = get_exception_string(value, type, cmdname, &should_free);
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if (excp->value == NULL && should_free) {
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goto nomem;
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}
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excp->type = type;
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if (type == ET_ERROR && ((msglist_T *)value)->sfile != NULL) {
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msglist_T *entry = (msglist_T *)value;
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excp->throw_name = entry->sfile;
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entry->sfile = NULL;
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excp->throw_lnum = entry->slnum;
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} else {
|
|
excp->throw_name = estack_sfile(ESTACK_NONE);
|
|
if (excp->throw_name == NULL) {
|
|
excp->throw_name = xstrdup("");
|
|
}
|
|
excp->throw_lnum = SOURCING_LNUM;
|
|
}
|
|
|
|
if (p_verbose >= 13 || debug_break_level > 0) {
|
|
int save_msg_silent = msg_silent;
|
|
|
|
if (debug_break_level > 0) {
|
|
msg_silent = false; // display messages
|
|
} else {
|
|
verbose_enter();
|
|
}
|
|
no_wait_return++;
|
|
if (debug_break_level > 0 || *p_vfile == NUL) {
|
|
msg_scroll = true; // always scroll up, don't overwrite
|
|
}
|
|
smsg(_("Exception thrown: %s"), excp->value);
|
|
msg_puts("\n"); // don't overwrite this either
|
|
|
|
if (debug_break_level > 0 || *p_vfile == NUL) {
|
|
cmdline_row = msg_row;
|
|
}
|
|
no_wait_return--;
|
|
if (debug_break_level > 0) {
|
|
msg_silent = save_msg_silent;
|
|
} else {
|
|
verbose_leave();
|
|
}
|
|
}
|
|
|
|
current_exception = excp;
|
|
return OK;
|
|
|
|
nomem:
|
|
xfree(excp);
|
|
suppress_errthrow = true;
|
|
emsg(_(e_outofmem));
|
|
fail:
|
|
current_exception = NULL;
|
|
return FAIL;
|
|
}
|
|
|
|
/// Discard an exception. "was_finished" is set when the exception has been
|
|
/// caught and the catch clause has been ended normally.
|
|
static void discard_exception(except_T *excp, bool was_finished)
|
|
{
|
|
char *saved_IObuff;
|
|
|
|
if (current_exception == excp) {
|
|
current_exception = NULL;
|
|
}
|
|
if (excp == NULL) {
|
|
internal_error("discard_exception()");
|
|
return;
|
|
}
|
|
|
|
if (p_verbose >= 13 || debug_break_level > 0) {
|
|
int save_msg_silent = msg_silent;
|
|
|
|
saved_IObuff = xstrdup((char *)IObuff);
|
|
if (debug_break_level > 0) {
|
|
msg_silent = false; // display messages
|
|
} else {
|
|
verbose_enter();
|
|
}
|
|
no_wait_return++;
|
|
if (debug_break_level > 0 || *p_vfile == NUL) {
|
|
msg_scroll = true; // always scroll up, don't overwrite
|
|
}
|
|
smsg(was_finished ? _("Exception finished: %s") : _("Exception discarded: %s"), excp->value);
|
|
msg_puts("\n"); // don't overwrite this either
|
|
if (debug_break_level > 0 || *p_vfile == NUL) {
|
|
cmdline_row = msg_row;
|
|
}
|
|
no_wait_return--;
|
|
if (debug_break_level > 0) {
|
|
msg_silent = save_msg_silent;
|
|
} else {
|
|
verbose_leave();
|
|
}
|
|
STRLCPY(IObuff, saved_IObuff, IOSIZE);
|
|
xfree(saved_IObuff);
|
|
}
|
|
if (excp->type != ET_INTERRUPT) {
|
|
xfree(excp->value);
|
|
}
|
|
if (excp->type == ET_ERROR) {
|
|
free_msglist(excp->messages);
|
|
}
|
|
xfree(excp->throw_name);
|
|
xfree(excp);
|
|
}
|
|
|
|
/// Discard the exception currently being thrown.
|
|
void discard_current_exception(void)
|
|
{
|
|
if (current_exception != NULL) {
|
|
discard_exception(current_exception, false);
|
|
}
|
|
// Note: all globals manipulated here should be saved/restored in
|
|
// try_enter/try_leave.
|
|
did_throw = false;
|
|
need_rethrow = false;
|
|
}
|
|
|
|
/// Put an exception on the caught stack.
|
|
static void catch_exception(except_T *excp)
|
|
{
|
|
excp->caught = caught_stack;
|
|
caught_stack = excp;
|
|
set_vim_var_string(VV_EXCEPTION, excp->value, -1);
|
|
if (*excp->throw_name != NUL) {
|
|
if (excp->throw_lnum != 0) {
|
|
vim_snprintf((char *)IObuff, IOSIZE, _("%s, line %" PRId64),
|
|
excp->throw_name, (int64_t)excp->throw_lnum);
|
|
} else {
|
|
vim_snprintf((char *)IObuff, IOSIZE, "%s", excp->throw_name);
|
|
}
|
|
set_vim_var_string(VV_THROWPOINT, (char *)IObuff, -1);
|
|
} else {
|
|
// throw_name not set on an exception from a command that was typed.
|
|
set_vim_var_string(VV_THROWPOINT, NULL, -1);
|
|
}
|
|
|
|
if (p_verbose >= 13 || debug_break_level > 0) {
|
|
int save_msg_silent = msg_silent;
|
|
|
|
if (debug_break_level > 0) {
|
|
msg_silent = false; // display messages
|
|
} else {
|
|
verbose_enter();
|
|
}
|
|
no_wait_return++;
|
|
if (debug_break_level > 0 || *p_vfile == NUL) {
|
|
msg_scroll = true; // always scroll up, don't overwrite
|
|
}
|
|
smsg(_("Exception caught: %s"), excp->value);
|
|
msg_puts("\n"); // don't overwrite this either
|
|
|
|
if (debug_break_level > 0 || *p_vfile == NUL) {
|
|
cmdline_row = msg_row;
|
|
}
|
|
no_wait_return--;
|
|
if (debug_break_level > 0) {
|
|
msg_silent = save_msg_silent;
|
|
} else {
|
|
verbose_leave();
|
|
}
|
|
}
|
|
}
|
|
|
|
/// Remove an exception from the caught stack.
|
|
static void finish_exception(except_T *excp)
|
|
{
|
|
if (excp != caught_stack) {
|
|
internal_error("finish_exception()");
|
|
}
|
|
caught_stack = caught_stack->caught;
|
|
if (caught_stack != NULL) {
|
|
set_vim_var_string(VV_EXCEPTION, caught_stack->value, -1);
|
|
if (*caught_stack->throw_name != NUL) {
|
|
if (caught_stack->throw_lnum != 0) {
|
|
vim_snprintf((char *)IObuff, IOSIZE,
|
|
_("%s, line %" PRId64), caught_stack->throw_name,
|
|
(int64_t)caught_stack->throw_lnum);
|
|
} else {
|
|
vim_snprintf((char *)IObuff, IOSIZE, "%s",
|
|
caught_stack->throw_name);
|
|
}
|
|
set_vim_var_string(VV_THROWPOINT, (char *)IObuff, -1);
|
|
} else {
|
|
// throw_name not set on an exception from a command that was
|
|
// typed.
|
|
set_vim_var_string(VV_THROWPOINT, NULL, -1);
|
|
}
|
|
} else {
|
|
set_vim_var_string(VV_EXCEPTION, NULL, -1);
|
|
set_vim_var_string(VV_THROWPOINT, NULL, -1);
|
|
}
|
|
|
|
// Discard the exception, but use the finish message for 'verbose'.
|
|
discard_exception(excp, true);
|
|
}
|
|
|
|
// Flags specifying the message displayed by report_pending.
|
|
#define RP_MAKE 0
|
|
#define RP_RESUME 1
|
|
#define RP_DISCARD 2
|
|
|
|
/// Report information about something pending in a finally clause if required by
|
|
/// the 'verbose' option or when debugging. "action" tells whether something is
|
|
/// made pending or something pending is resumed or discarded. "pending" tells
|
|
/// what is pending. "value" specifies the return value for a pending ":return"
|
|
/// or the exception value for a pending exception.
|
|
static void report_pending(int action, int pending, void *value)
|
|
{
|
|
char *mesg;
|
|
char *s;
|
|
int save_msg_silent;
|
|
|
|
assert(value || !(pending & CSTP_THROW));
|
|
|
|
switch (action) {
|
|
case RP_MAKE:
|
|
mesg = _("%s made pending");
|
|
break;
|
|
case RP_RESUME:
|
|
mesg = _("%s resumed");
|
|
break;
|
|
// case RP_DISCARD:
|
|
default:
|
|
mesg = _("%s discarded");
|
|
break;
|
|
}
|
|
|
|
switch (pending) {
|
|
case CSTP_NONE:
|
|
return;
|
|
|
|
case CSTP_CONTINUE:
|
|
s = ":continue";
|
|
break;
|
|
case CSTP_BREAK:
|
|
s = ":break";
|
|
break;
|
|
case CSTP_FINISH:
|
|
s = ":finish";
|
|
break;
|
|
case CSTP_RETURN:
|
|
// ":return" command producing value, allocated
|
|
s = get_return_cmd(value);
|
|
break;
|
|
|
|
default:
|
|
if (pending & CSTP_THROW) {
|
|
vim_snprintf((char *)IObuff, IOSIZE,
|
|
mesg, _("Exception"));
|
|
mesg = concat_str((char *)IObuff, ": %s");
|
|
s = ((except_T *)value)->value;
|
|
} else if ((pending & CSTP_ERROR) && (pending & CSTP_INTERRUPT)) {
|
|
s = _("Error and interrupt");
|
|
} else if (pending & CSTP_ERROR) {
|
|
s = _("Error");
|
|
} else { // if (pending & CSTP_INTERRUPT)
|
|
s = _("Interrupt");
|
|
}
|
|
}
|
|
|
|
save_msg_silent = msg_silent;
|
|
if (debug_break_level > 0) {
|
|
msg_silent = false; // display messages
|
|
}
|
|
no_wait_return++;
|
|
msg_scroll = true; // always scroll up, don't overwrite
|
|
smsg(mesg, s);
|
|
msg_puts("\n"); // don't overwrite this either
|
|
cmdline_row = msg_row;
|
|
no_wait_return--;
|
|
if (debug_break_level > 0) {
|
|
msg_silent = save_msg_silent;
|
|
}
|
|
|
|
if (pending == CSTP_RETURN) {
|
|
xfree(s);
|
|
} else if (pending & CSTP_THROW) {
|
|
xfree(mesg);
|
|
}
|
|
}
|
|
|
|
/// If something is made pending in a finally clause, report it if required by
|
|
/// the 'verbose' option or when debugging.
|
|
void report_make_pending(int pending, void *value)
|
|
{
|
|
if (p_verbose >= 14 || debug_break_level > 0) {
|
|
if (debug_break_level <= 0) {
|
|
verbose_enter();
|
|
}
|
|
report_pending(RP_MAKE, pending, value);
|
|
if (debug_break_level <= 0) {
|
|
verbose_leave();
|
|
}
|
|
}
|
|
}
|
|
|
|
/// If something pending in a finally clause is resumed at the ":endtry", report
|
|
/// it if required by the 'verbose' option or when debugging.
|
|
void report_resume_pending(int pending, void *value)
|
|
{
|
|
if (p_verbose >= 14 || debug_break_level > 0) {
|
|
if (debug_break_level <= 0) {
|
|
verbose_enter();
|
|
}
|
|
report_pending(RP_RESUME, pending, value);
|
|
if (debug_break_level <= 0) {
|
|
verbose_leave();
|
|
}
|
|
}
|
|
}
|
|
|
|
/// If something pending in a finally clause is discarded, report it if required
|
|
/// by the 'verbose' option or when debugging.
|
|
void report_discard_pending(int pending, void *value)
|
|
{
|
|
if (p_verbose >= 14 || debug_break_level > 0) {
|
|
if (debug_break_level <= 0) {
|
|
verbose_enter();
|
|
}
|
|
report_pending(RP_DISCARD, pending, value);
|
|
if (debug_break_level <= 0) {
|
|
verbose_leave();
|
|
}
|
|
}
|
|
}
|
|
|
|
/// Handle ":eval".
|
|
void ex_eval(exarg_T *eap)
|
|
{
|
|
typval_T tv;
|
|
|
|
if (eval0(eap->arg, &tv, &eap->nextcmd, !eap->skip) == OK) {
|
|
tv_clear(&tv);
|
|
}
|
|
}
|
|
|
|
/// Handle ":if".
|
|
void ex_if(exarg_T *eap)
|
|
{
|
|
int skip;
|
|
int result;
|
|
cstack_T *const cstack = eap->cstack;
|
|
|
|
if (cstack->cs_idx == CSTACK_LEN - 1) {
|
|
eap->errmsg = _("E579: :if nesting too deep");
|
|
} else {
|
|
cstack->cs_idx++;
|
|
cstack->cs_flags[cstack->cs_idx] = 0;
|
|
|
|
skip = CHECK_SKIP;
|
|
|
|
bool error;
|
|
result = eval_to_bool(eap->arg, &error, &eap->nextcmd, skip);
|
|
|
|
if (!skip && !error) {
|
|
if (result) {
|
|
cstack->cs_flags[cstack->cs_idx] = CSF_ACTIVE | CSF_TRUE;
|
|
}
|
|
} else {
|
|
// set TRUE, so this conditional will never get active
|
|
cstack->cs_flags[cstack->cs_idx] = CSF_TRUE;
|
|
}
|
|
}
|
|
}
|
|
|
|
/// Handle ":endif".
|
|
void ex_endif(exarg_T *eap)
|
|
{
|
|
did_endif = true;
|
|
if (eap->cstack->cs_idx < 0
|
|
|| (eap->cstack->cs_flags[eap->cstack->cs_idx]
|
|
& (CSF_WHILE | CSF_FOR | CSF_TRY))) {
|
|
eap->errmsg = _("E580: :endif without :if");
|
|
} else {
|
|
// When debugging or a breakpoint was encountered, display the debug
|
|
// prompt (if not already done). This shows the user that an ":endif"
|
|
// is executed when the ":if" or a previous ":elseif" was not TRUE.
|
|
// Handle a ">quit" debug command as if an interrupt had occurred before
|
|
// the ":endif". That is, throw an interrupt exception if appropriate.
|
|
// Doing this here prevents an exception for a parsing error being
|
|
// discarded by throwing the interrupt exception later on.
|
|
if (!(eap->cstack->cs_flags[eap->cstack->cs_idx] & CSF_TRUE)
|
|
&& dbg_check_skipped(eap)) {
|
|
(void)do_intthrow(eap->cstack);
|
|
}
|
|
|
|
eap->cstack->cs_idx--;
|
|
}
|
|
}
|
|
|
|
/// Handle ":else" and ":elseif".
|
|
void ex_else(exarg_T *eap)
|
|
{
|
|
bool result = false;
|
|
cstack_T *const cstack = eap->cstack;
|
|
|
|
bool skip = CHECK_SKIP;
|
|
|
|
if (cstack->cs_idx < 0
|
|
|| (cstack->cs_flags[cstack->cs_idx]
|
|
& (CSF_WHILE | CSF_FOR | CSF_TRY))) {
|
|
if (eap->cmdidx == CMD_else) {
|
|
eap->errmsg = _("E581: :else without :if");
|
|
return;
|
|
}
|
|
eap->errmsg = _("E582: :elseif without :if");
|
|
skip = true;
|
|
} else if (cstack->cs_flags[cstack->cs_idx] & CSF_ELSE) {
|
|
if (eap->cmdidx == CMD_else) {
|
|
eap->errmsg = _("E583: multiple :else");
|
|
return;
|
|
}
|
|
eap->errmsg = _("E584: :elseif after :else");
|
|
skip = true;
|
|
}
|
|
|
|
// if skipping or the ":if" was TRUE, reset ACTIVE, otherwise set it
|
|
if (skip || cstack->cs_flags[cstack->cs_idx] & CSF_TRUE) {
|
|
if (eap->errmsg == NULL) {
|
|
cstack->cs_flags[cstack->cs_idx] = CSF_TRUE;
|
|
}
|
|
skip = true; // don't evaluate an ":elseif"
|
|
} else {
|
|
cstack->cs_flags[cstack->cs_idx] = CSF_ACTIVE;
|
|
}
|
|
|
|
// When debugging or a breakpoint was encountered, display the debug prompt
|
|
// (if not already done). This shows the user that an ":else" or ":elseif"
|
|
// is executed when the ":if" or previous ":elseif" was not TRUE. Handle
|
|
// a ">quit" debug command as if an interrupt had occurred before the
|
|
// ":else" or ":elseif". That is, set "skip" and throw an interrupt
|
|
// exception if appropriate. Doing this here prevents that an exception
|
|
// for a parsing errors is discarded when throwing the interrupt exception
|
|
// later on.
|
|
if (!skip && dbg_check_skipped(eap) && got_int) {
|
|
(void)do_intthrow(cstack);
|
|
skip = true;
|
|
}
|
|
|
|
if (eap->cmdidx == CMD_elseif) {
|
|
bool error;
|
|
// When skipping we ignore most errors, but a missing expression is
|
|
// wrong, perhaps it should have been "else".
|
|
// A double quote here is the start of a string, not a comment.
|
|
if (skip && *eap->arg != '"' && ends_excmd(*eap->arg)) {
|
|
semsg(_(e_invexpr2), eap->arg);
|
|
} else {
|
|
result = eval_to_bool(eap->arg, &error, &eap->nextcmd, skip);
|
|
}
|
|
|
|
// When throwing error exceptions, we want to throw always the first
|
|
// of several errors in a row. This is what actually happens when
|
|
// a conditional error was detected above and there is another failure
|
|
// when parsing the expression. Since the skip flag is set in this
|
|
// case, the parsing error will be ignored by emsg().
|
|
if (!skip && !error) {
|
|
if (result) {
|
|
cstack->cs_flags[cstack->cs_idx] = CSF_ACTIVE | CSF_TRUE;
|
|
} else {
|
|
cstack->cs_flags[cstack->cs_idx] = 0;
|
|
}
|
|
} else if (eap->errmsg == NULL) {
|
|
// set TRUE, so this conditional will never get active
|
|
cstack->cs_flags[cstack->cs_idx] = CSF_TRUE;
|
|
}
|
|
} else {
|
|
cstack->cs_flags[cstack->cs_idx] |= CSF_ELSE;
|
|
}
|
|
}
|
|
|
|
/// Handle ":while" and ":for".
|
|
void ex_while(exarg_T *eap)
|
|
{
|
|
bool error;
|
|
int skip;
|
|
int result;
|
|
cstack_T *const cstack = eap->cstack;
|
|
|
|
if (cstack->cs_idx == CSTACK_LEN - 1) {
|
|
eap->errmsg = _("E585: :while/:for nesting too deep");
|
|
} else {
|
|
// The loop flag is set when we have jumped back from the matching
|
|
// ":endwhile" or ":endfor". When not set, need to initialise this
|
|
// cstack entry.
|
|
if ((cstack->cs_lflags & CSL_HAD_LOOP) == 0) {
|
|
cstack->cs_idx++;
|
|
cstack->cs_looplevel++;
|
|
cstack->cs_line[cstack->cs_idx] = -1;
|
|
}
|
|
cstack->cs_flags[cstack->cs_idx] =
|
|
eap->cmdidx == CMD_while ? CSF_WHILE : CSF_FOR;
|
|
|
|
skip = CHECK_SKIP;
|
|
if (eap->cmdidx == CMD_while) {
|
|
// ":while bool-expr"
|
|
result = eval_to_bool(eap->arg, &error, &eap->nextcmd, skip);
|
|
} else {
|
|
void *fi;
|
|
|
|
// ":for var in list-expr"
|
|
if ((cstack->cs_lflags & CSL_HAD_LOOP) != 0) {
|
|
// Jumping here from a ":continue" or ":endfor": use the
|
|
// previously evaluated list.
|
|
fi = cstack->cs_forinfo[cstack->cs_idx];
|
|
error = false;
|
|
} else {
|
|
// Evaluate the argument and get the info in a structure.
|
|
fi = eval_for_line(eap->arg, &error, &eap->nextcmd, skip);
|
|
cstack->cs_forinfo[cstack->cs_idx] = fi;
|
|
}
|
|
|
|
// use the element at the start of the list and advance
|
|
if (!error && fi != NULL && !skip) {
|
|
result = next_for_item(fi, eap->arg);
|
|
} else {
|
|
result = false;
|
|
}
|
|
|
|
if (!result) {
|
|
free_for_info(fi);
|
|
cstack->cs_forinfo[cstack->cs_idx] = NULL;
|
|
}
|
|
}
|
|
|
|
// If this cstack entry was just initialised and is active, set the
|
|
// loop flag, so do_cmdline() will set the line number in cs_line[].
|
|
// If executing the command a second time, clear the loop flag.
|
|
if (!skip && !error && result) {
|
|
cstack->cs_flags[cstack->cs_idx] |= (CSF_ACTIVE | CSF_TRUE);
|
|
cstack->cs_lflags ^= CSL_HAD_LOOP;
|
|
} else {
|
|
cstack->cs_lflags &= ~CSL_HAD_LOOP;
|
|
// If the ":while" evaluates to FALSE or ":for" is past the end of
|
|
// the list, show the debug prompt at the ":endwhile"/":endfor" as
|
|
// if there was a ":break" in a ":while"/":for" evaluating to
|
|
// TRUE.
|
|
if (!skip && !error) {
|
|
cstack->cs_flags[cstack->cs_idx] |= CSF_TRUE;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/// Handle ":continue"
|
|
void ex_continue(exarg_T *eap)
|
|
{
|
|
int idx;
|
|
cstack_T *const cstack = eap->cstack;
|
|
|
|
if (cstack->cs_looplevel <= 0 || cstack->cs_idx < 0) {
|
|
eap->errmsg = _("E586: :continue without :while or :for");
|
|
} else {
|
|
// Try to find the matching ":while". This might stop at a try
|
|
// conditional not in its finally clause (which is then to be executed
|
|
// next). Therefore, deactivate all conditionals except the ":while"
|
|
// itself (if reached).
|
|
idx = cleanup_conditionals(cstack, CSF_WHILE | CSF_FOR, false);
|
|
assert(idx >= 0);
|
|
if (cstack->cs_flags[idx] & (CSF_WHILE | CSF_FOR)) {
|
|
rewind_conditionals(cstack, idx, CSF_TRY, &cstack->cs_trylevel);
|
|
|
|
// Set CSL_HAD_CONT, so do_cmdline() will jump back to the
|
|
// matching ":while".
|
|
cstack->cs_lflags |= CSL_HAD_CONT; // let do_cmdline() handle it
|
|
} else {
|
|
// If a try conditional not in its finally clause is reached first,
|
|
// make the ":continue" pending for execution at the ":endtry".
|
|
cstack->cs_pending[idx] = CSTP_CONTINUE;
|
|
report_make_pending(CSTP_CONTINUE, NULL);
|
|
}
|
|
}
|
|
}
|
|
|
|
/// Handle ":break"
|
|
void ex_break(exarg_T *eap)
|
|
{
|
|
int idx;
|
|
cstack_T *const cstack = eap->cstack;
|
|
|
|
if (cstack->cs_looplevel <= 0 || cstack->cs_idx < 0) {
|
|
eap->errmsg = _("E587: :break without :while or :for");
|
|
} else {
|
|
// Deactivate conditionals until the matching ":while" or a try
|
|
// conditional not in its finally clause (which is then to be
|
|
// executed next) is found. In the latter case, make the ":break"
|
|
// pending for execution at the ":endtry".
|
|
idx = cleanup_conditionals(cstack, CSF_WHILE | CSF_FOR, true);
|
|
if (idx >= 0 && !(cstack->cs_flags[idx] & (CSF_WHILE | CSF_FOR))) {
|
|
cstack->cs_pending[idx] = CSTP_BREAK;
|
|
report_make_pending(CSTP_BREAK, NULL);
|
|
}
|
|
}
|
|
}
|
|
|
|
/// Handle ":endwhile" and ":endfor"
|
|
void ex_endwhile(exarg_T *eap)
|
|
{
|
|
cstack_T *const cstack = eap->cstack;
|
|
int idx;
|
|
char *err;
|
|
int csf;
|
|
int fl;
|
|
|
|
if (eap->cmdidx == CMD_endwhile) {
|
|
err = e_while;
|
|
csf = CSF_WHILE;
|
|
} else {
|
|
err = e_for;
|
|
csf = CSF_FOR;
|
|
}
|
|
|
|
if (cstack->cs_looplevel <= 0 || cstack->cs_idx < 0) {
|
|
eap->errmsg = _(err);
|
|
} else {
|
|
fl = cstack->cs_flags[cstack->cs_idx];
|
|
if (!(fl & csf)) {
|
|
// If we are in a ":while" or ":for" but used the wrong endloop
|
|
// command, do not rewind to the next enclosing ":for"/":while".
|
|
if (fl & CSF_WHILE) {
|
|
eap->errmsg = _("E732: Using :endfor with :while");
|
|
} else if (fl & CSF_FOR) {
|
|
eap->errmsg = _("E733: Using :endwhile with :for");
|
|
}
|
|
}
|
|
if (!(fl & (CSF_WHILE | CSF_FOR))) {
|
|
if (!(fl & CSF_TRY)) {
|
|
eap->errmsg = _(e_endif);
|
|
} else if (fl & CSF_FINALLY) {
|
|
eap->errmsg = _(e_endtry);
|
|
}
|
|
// Try to find the matching ":while" and report what's missing.
|
|
for (idx = cstack->cs_idx; idx > 0; idx--) {
|
|
fl = cstack->cs_flags[idx];
|
|
if ((fl & CSF_TRY) && !(fl & CSF_FINALLY)) {
|
|
// Give up at a try conditional not in its finally clause.
|
|
// Ignore the ":endwhile"/":endfor".
|
|
eap->errmsg = _(err);
|
|
return;
|
|
}
|
|
if (fl & csf) {
|
|
break;
|
|
}
|
|
}
|
|
// Cleanup and rewind all contained (and unclosed) conditionals.
|
|
(void)cleanup_conditionals(cstack, CSF_WHILE | CSF_FOR, false);
|
|
rewind_conditionals(cstack, idx, CSF_TRY, &cstack->cs_trylevel);
|
|
} else if (cstack->cs_flags[cstack->cs_idx] & CSF_TRUE
|
|
&& !(cstack->cs_flags[cstack->cs_idx] & CSF_ACTIVE)
|
|
&& dbg_check_skipped(eap)) {
|
|
// When debugging or a breakpoint was encountered, display the debug
|
|
// prompt (if not already done). This shows the user that an
|
|
// ":endwhile"/":endfor" is executed when the ":while" was not TRUE or
|
|
// after a ":break". Handle a ">quit" debug command as if an
|
|
// interrupt had occurred before the ":endwhile"/":endfor". That is,
|
|
// throw an interrupt exception if appropriate. Doing this here
|
|
// prevents that an exception for a parsing error is discarded when
|
|
// throwing the interrupt exception later on.
|
|
(void)do_intthrow(cstack);
|
|
}
|
|
|
|
// Set loop flag, so do_cmdline() will jump back to the matching
|
|
// ":while" or ":for".
|
|
cstack->cs_lflags |= CSL_HAD_ENDLOOP;
|
|
}
|
|
}
|
|
|
|
/// Handle ":throw expr"
|
|
void ex_throw(exarg_T *eap)
|
|
{
|
|
const char *arg = (const char *)eap->arg;
|
|
char *value;
|
|
|
|
if (*arg != NUL && *arg != '|' && *arg != '\n') {
|
|
value = eval_to_string_skip(arg, (const char **)&eap->nextcmd,
|
|
(bool)eap->skip);
|
|
} else {
|
|
emsg(_(e_argreq));
|
|
value = NULL;
|
|
}
|
|
|
|
// On error or when an exception is thrown during argument evaluation, do
|
|
// not throw.
|
|
if (!eap->skip && value != NULL) {
|
|
if (throw_exception((char_u *)value, ET_USER, NULL) == FAIL) {
|
|
xfree(value);
|
|
} else {
|
|
do_throw(eap->cstack);
|
|
}
|
|
}
|
|
}
|
|
|
|
/// Throw the current exception through the specified cstack. Common routine
|
|
/// for ":throw" (user exception) and error and interrupt exceptions. Also
|
|
/// used for rethrowing an uncaught exception.
|
|
void do_throw(cstack_T *cstack)
|
|
{
|
|
int idx;
|
|
int inactivate_try = false;
|
|
|
|
//
|
|
// Cleanup and deactivate up to the next surrounding try conditional that
|
|
// is not in its finally clause. Normally, do not deactivate the try
|
|
// conditional itself, so that its ACTIVE flag can be tested below. But
|
|
// if a previous error or interrupt has not been converted to an exception,
|
|
// deactivate the try conditional, too, as if the conversion had been done,
|
|
// and reset the did_emsg or got_int flag, so this won't happen again at
|
|
// the next surrounding try conditional.
|
|
//
|
|
#ifndef THROW_ON_ERROR_TRUE
|
|
if (did_emsg && !THROW_ON_ERROR) {
|
|
inactivate_try = true;
|
|
did_emsg = false;
|
|
}
|
|
#endif
|
|
#ifndef THROW_ON_INTERRUPT_TRUE
|
|
if (got_int && !THROW_ON_INTERRUPT) {
|
|
inactivate_try = true;
|
|
got_int = false;
|
|
}
|
|
#endif
|
|
idx = cleanup_conditionals(cstack, 0, inactivate_try);
|
|
if (idx >= 0) {
|
|
// If this try conditional is active and we are before its first
|
|
// ":catch", set THROWN so that the ":catch" commands will check
|
|
// whether the exception matches. When the exception came from any of
|
|
// the catch clauses, it will be made pending at the ":finally" (if
|
|
// present) and rethrown at the ":endtry". This will also happen if
|
|
// the try conditional is inactive. This is the case when we are
|
|
// throwing an exception due to an error or interrupt on the way from
|
|
// a preceding ":continue", ":break", ":return", ":finish", error or
|
|
// interrupt (not converted to an exception) to the finally clause or
|
|
// from a preceding throw of a user or error or interrupt exception to
|
|
// the matching catch clause or the finally clause.
|
|
if (!(cstack->cs_flags[idx] & CSF_CAUGHT)) {
|
|
if (cstack->cs_flags[idx] & CSF_ACTIVE) {
|
|
cstack->cs_flags[idx] |= CSF_THROWN;
|
|
} else {
|
|
// THROWN may have already been set for a catchable exception
|
|
// that has been discarded. Ensure it is reset for the new
|
|
// exception.
|
|
cstack->cs_flags[idx] &= ~CSF_THROWN;
|
|
}
|
|
}
|
|
cstack->cs_flags[idx] &= ~CSF_ACTIVE;
|
|
cstack->cs_exception[idx] = current_exception;
|
|
}
|
|
|
|
did_throw = true;
|
|
}
|
|
|
|
/// Handle ":try"
|
|
void ex_try(exarg_T *eap)
|
|
{
|
|
int skip;
|
|
cstack_T *const cstack = eap->cstack;
|
|
|
|
if (cstack->cs_idx == CSTACK_LEN - 1) {
|
|
eap->errmsg = _("E601: :try nesting too deep");
|
|
} else {
|
|
cstack->cs_idx++;
|
|
cstack->cs_trylevel++;
|
|
cstack->cs_flags[cstack->cs_idx] = CSF_TRY;
|
|
cstack->cs_pending[cstack->cs_idx] = CSTP_NONE;
|
|
|
|
skip = CHECK_SKIP;
|
|
|
|
if (!skip) {
|
|
// Set ACTIVE and TRUE. TRUE means that the corresponding ":catch"
|
|
// commands should check for a match if an exception is thrown and
|
|
// that the finally clause needs to be executed.
|
|
cstack->cs_flags[cstack->cs_idx] |= CSF_ACTIVE | CSF_TRUE;
|
|
|
|
// ":silent!", even when used in a try conditional, disables
|
|
// displaying of error messages and conversion of errors to
|
|
// exceptions. When the silent commands again open a try
|
|
// conditional, save "emsg_silent" and reset it so that errors are
|
|
// again converted to exceptions. The value is restored when that
|
|
// try conditional is left. If it is left normally, the commands
|
|
// following the ":endtry" are again silent. If it is left by
|
|
// a ":continue", ":break", ":return", or ":finish", the commands
|
|
// executed next are again silent. If it is left due to an
|
|
// aborting error, an interrupt, or an exception, restoring
|
|
// "emsg_silent" does not matter since we are already in the
|
|
// aborting state and/or the exception has already been thrown.
|
|
// The effect is then just freeing the memory that was allocated
|
|
// to save the value.
|
|
if (emsg_silent) {
|
|
eslist_T *elem = xmalloc(sizeof(*elem));
|
|
elem->saved_emsg_silent = emsg_silent;
|
|
elem->next = cstack->cs_emsg_silent_list;
|
|
cstack->cs_emsg_silent_list = elem;
|
|
cstack->cs_flags[cstack->cs_idx] |= CSF_SILENT;
|
|
emsg_silent = 0;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/// Handle ":catch /{pattern}/" and ":catch"
|
|
void ex_catch(exarg_T *eap)
|
|
{
|
|
int idx = 0;
|
|
bool give_up = false;
|
|
bool skip = false;
|
|
bool caught = false;
|
|
char *end;
|
|
char save_char = 0;
|
|
char *save_cpo;
|
|
regmatch_T regmatch;
|
|
int prev_got_int;
|
|
cstack_T *const cstack = eap->cstack;
|
|
char *pat;
|
|
|
|
if (cstack->cs_trylevel <= 0 || cstack->cs_idx < 0) {
|
|
eap->errmsg = _("E603: :catch without :try");
|
|
give_up = true;
|
|
} else {
|
|
if (!(cstack->cs_flags[cstack->cs_idx] & CSF_TRY)) {
|
|
// Report what's missing if the matching ":try" is not in its
|
|
// finally clause.
|
|
eap->errmsg = get_end_emsg(cstack);
|
|
skip = true;
|
|
}
|
|
for (idx = cstack->cs_idx; idx > 0; idx--) {
|
|
if (cstack->cs_flags[idx] & CSF_TRY) {
|
|
break;
|
|
}
|
|
}
|
|
if (cstack->cs_flags[idx] & CSF_FINALLY) {
|
|
// Give up for a ":catch" after ":finally" and ignore it.
|
|
// Just parse.
|
|
eap->errmsg = _("E604: :catch after :finally");
|
|
give_up = true;
|
|
} else {
|
|
rewind_conditionals(cstack, idx, CSF_WHILE | CSF_FOR,
|
|
&cstack->cs_looplevel);
|
|
}
|
|
}
|
|
|
|
if (ends_excmd(*eap->arg)) { // no argument, catch all errors
|
|
pat = ".*";
|
|
end = NULL;
|
|
eap->nextcmd = find_nextcmd(eap->arg);
|
|
} else {
|
|
pat = eap->arg + 1;
|
|
end = skip_regexp_err(pat, *eap->arg, true);
|
|
if (end == NULL) {
|
|
give_up = true;
|
|
}
|
|
}
|
|
|
|
if (!give_up) {
|
|
// Don't do something when no exception has been thrown or when the
|
|
// corresponding try block never got active (because of an inactive
|
|
// surrounding conditional or after an error or interrupt or throw).
|
|
if (!did_throw || !(cstack->cs_flags[idx] & CSF_TRUE)) {
|
|
skip = true;
|
|
}
|
|
|
|
// Check for a match only if an exception is thrown but not caught by
|
|
// a previous ":catch". An exception that has replaced a discarded
|
|
// exception is not checked (THROWN is not set then).
|
|
if (!skip && (cstack->cs_flags[idx] & CSF_THROWN)
|
|
&& !(cstack->cs_flags[idx] & CSF_CAUGHT)) {
|
|
if (end != NULL && *end != NUL && !ends_excmd(*skipwhite(end + 1))) {
|
|
semsg(_(e_trailing_arg), end);
|
|
return;
|
|
}
|
|
|
|
// When debugging or a breakpoint was encountered, display the
|
|
// debug prompt (if not already done) before checking for a match.
|
|
// This is a helpful hint for the user when the regular expression
|
|
// matching fails. Handle a ">quit" debug command as if an
|
|
// interrupt had occurred before the ":catch". That is, discard
|
|
// the original exception, replace it by an interrupt exception,
|
|
// and don't catch it in this try block.
|
|
if (!dbg_check_skipped(eap) || !do_intthrow(cstack)) {
|
|
// Terminate the pattern and avoid the 'l' flag in 'cpoptions'
|
|
// while compiling it.
|
|
if (end != NULL) {
|
|
save_char = *end;
|
|
*end = NUL;
|
|
}
|
|
save_cpo = p_cpo;
|
|
p_cpo = empty_option;
|
|
// Disable error messages, it will make current exception
|
|
// invalid
|
|
emsg_off++;
|
|
regmatch.regprog = vim_regcomp(pat, RE_MAGIC + RE_STRING);
|
|
emsg_off--;
|
|
regmatch.rm_ic = false;
|
|
if (end != NULL) {
|
|
*end = save_char;
|
|
}
|
|
p_cpo = save_cpo;
|
|
if (regmatch.regprog == NULL) {
|
|
semsg(_(e_invarg2), pat);
|
|
} else {
|
|
//
|
|
// Save the value of got_int and reset it. We don't want
|
|
// a previous interruption cancel matching, only hitting
|
|
// CTRL-C while matching should abort it.
|
|
//
|
|
prev_got_int = got_int;
|
|
got_int = false;
|
|
caught = vim_regexec_nl(®match, (char_u *)current_exception->value,
|
|
(colnr_T)0);
|
|
got_int |= prev_got_int;
|
|
vim_regfree(regmatch.regprog);
|
|
}
|
|
}
|
|
}
|
|
|
|
if (caught) {
|
|
// Make this ":catch" clause active and reset did_emsg, got_int,
|
|
// and did_throw. Put the exception on the caught stack.
|
|
cstack->cs_flags[idx] |= CSF_ACTIVE | CSF_CAUGHT;
|
|
did_emsg = got_int = did_throw = false;
|
|
catch_exception((except_T *)cstack->cs_exception[idx]);
|
|
// It's mandatory that the current exception is stored in the cstack
|
|
// so that it can be discarded at the next ":catch", ":finally", or
|
|
// ":endtry" or when the catch clause is left by a ":continue",
|
|
// ":break", ":return", ":finish", error, interrupt, or another
|
|
// exception.
|
|
if (cstack->cs_exception[cstack->cs_idx] != current_exception) {
|
|
internal_error("ex_catch()");
|
|
}
|
|
} else {
|
|
// If there is a preceding catch clause and it caught the exception,
|
|
// finish the exception now. This happens also after errors except
|
|
// when this ":catch" was after the ":finally" or not within
|
|
// a ":try". Make the try conditional inactive so that the
|
|
// following catch clauses are skipped. On an error or interrupt
|
|
// after the preceding try block or catch clause was left by
|
|
// a ":continue", ":break", ":return", or ":finish", discard the
|
|
// pending action.
|
|
cleanup_conditionals(cstack, CSF_TRY, true);
|
|
}
|
|
}
|
|
|
|
if (end != NULL) {
|
|
eap->nextcmd = find_nextcmd(end);
|
|
}
|
|
}
|
|
|
|
/// Handle ":finally"
|
|
void ex_finally(exarg_T *eap)
|
|
{
|
|
int idx;
|
|
int skip = false;
|
|
int pending = CSTP_NONE;
|
|
cstack_T *const cstack = eap->cstack;
|
|
|
|
for (idx = cstack->cs_idx; idx >= 0; idx--) {
|
|
if (cstack->cs_flags[idx] & CSF_TRY) {
|
|
break;
|
|
}
|
|
}
|
|
if (cstack->cs_trylevel <= 0 || idx < 0) {
|
|
eap->errmsg = _("E606: :finally without :try");
|
|
return;
|
|
}
|
|
|
|
if (!(cstack->cs_flags[cstack->cs_idx] & CSF_TRY)) {
|
|
eap->errmsg = get_end_emsg(cstack);
|
|
// Make this error pending, so that the commands in the following
|
|
// finally clause can be executed. This overrules also a pending
|
|
// ":continue", ":break", ":return", or ":finish".
|
|
pending = CSTP_ERROR;
|
|
}
|
|
|
|
if (cstack->cs_flags[idx] & CSF_FINALLY) {
|
|
// Give up for a multiple ":finally" and ignore it.
|
|
eap->errmsg = _("E607: multiple :finally");
|
|
return;
|
|
}
|
|
rewind_conditionals(cstack, idx, CSF_WHILE | CSF_FOR,
|
|
&cstack->cs_looplevel);
|
|
|
|
// Don't do something when the corresponding try block never got active
|
|
// (because of an inactive surrounding conditional or after an error or
|
|
// interrupt or throw) or for a ":finally" without ":try" or a multiple
|
|
// ":finally". After every other error (did_emsg or the conditional
|
|
// errors detected above) or after an interrupt (got_int) or an
|
|
// exception (did_throw), the finally clause must be executed.
|
|
skip = !(cstack->cs_flags[cstack->cs_idx] & CSF_TRUE);
|
|
|
|
if (!skip) {
|
|
// When debugging or a breakpoint was encountered, display the
|
|
// debug prompt (if not already done). The user then knows that the
|
|
// finally clause is executed.
|
|
if (dbg_check_skipped(eap)) {
|
|
// Handle a ">quit" debug command as if an interrupt had
|
|
// occurred before the ":finally". That is, discard the
|
|
// original exception and replace it by an interrupt
|
|
// exception.
|
|
(void)do_intthrow(cstack);
|
|
}
|
|
|
|
// If there is a preceding catch clause and it caught the exception,
|
|
// finish the exception now. This happens also after errors except
|
|
// when this is a multiple ":finally" or one not within a ":try".
|
|
// After an error or interrupt, this also discards a pending
|
|
// ":continue", ":break", ":finish", or ":return" from the preceding
|
|
// try block or catch clause.
|
|
cleanup_conditionals(cstack, CSF_TRY, false);
|
|
|
|
// Make did_emsg, got_int, did_throw pending. If set, they overrule
|
|
// a pending ":continue", ":break", ":return", or ":finish". Then
|
|
// we have particularly to discard a pending return value (as done
|
|
// by the call to cleanup_conditionals() above when did_emsg or
|
|
// got_int is set). The pending values are restored by the
|
|
// ":endtry", except if there is a new error, interrupt, exception,
|
|
// ":continue", ":break", ":return", or ":finish" in the following
|
|
// finally clause. A missing ":endwhile", ":endfor" or ":endif"
|
|
// detected here is treated as if did_emsg and did_throw had
|
|
// already been set, respectively in case that the error is not
|
|
// converted to an exception, did_throw had already been unset.
|
|
// We must not set did_emsg here since that would suppress the
|
|
// error message.
|
|
if (pending == CSTP_ERROR || did_emsg || got_int || did_throw) {
|
|
if (cstack->cs_pending[cstack->cs_idx] == CSTP_RETURN) {
|
|
report_discard_pending(CSTP_RETURN,
|
|
cstack->cs_rettv[cstack->cs_idx]);
|
|
discard_pending_return(cstack->cs_rettv[cstack->cs_idx]);
|
|
}
|
|
if (pending == CSTP_ERROR && !did_emsg) {
|
|
pending |= (THROW_ON_ERROR ? CSTP_THROW : 0);
|
|
} else {
|
|
pending |= (did_throw ? CSTP_THROW : 0);
|
|
}
|
|
pending |= did_emsg ? CSTP_ERROR : 0;
|
|
pending |= got_int ? CSTP_INTERRUPT : 0;
|
|
assert(pending >= CHAR_MIN && pending <= CHAR_MAX);
|
|
cstack->cs_pending[cstack->cs_idx] = (char)pending;
|
|
|
|
// It's mandatory that the current exception is stored in the
|
|
// cstack so that it can be rethrown at the ":endtry" or be
|
|
// discarded if the finally clause is left by a ":continue",
|
|
// ":break", ":return", ":finish", error, interrupt, or another
|
|
// exception. When emsg() is called for a missing ":endif" or
|
|
// a missing ":endwhile"/":endfor" detected here, the
|
|
// exception will be discarded.
|
|
if (did_throw && cstack->cs_exception[cstack->cs_idx] != current_exception) {
|
|
internal_error("ex_finally()");
|
|
}
|
|
}
|
|
|
|
// Set CSL_HAD_FINA, so do_cmdline() will reset did_emsg,
|
|
// got_int, and did_throw and make the finally clause active.
|
|
// This will happen after emsg() has been called for a missing
|
|
// ":endif" or a missing ":endwhile"/":endfor" detected here, so
|
|
// that the following finally clause will be executed even then.
|
|
cstack->cs_lflags |= CSL_HAD_FINA;
|
|
}
|
|
}
|
|
|
|
/// Handle ":endtry"
|
|
void ex_endtry(exarg_T *eap)
|
|
{
|
|
int idx;
|
|
bool rethrow = false;
|
|
char pending = CSTP_NONE;
|
|
void *rettv = NULL;
|
|
cstack_T *const cstack = eap->cstack;
|
|
|
|
for (idx = cstack->cs_idx; idx >= 0; idx--) {
|
|
if (cstack->cs_flags[idx] & CSF_TRY) {
|
|
break;
|
|
}
|
|
}
|
|
if (cstack->cs_trylevel <= 0 || idx < 0) {
|
|
eap->errmsg = _("E602: :endtry without :try");
|
|
return;
|
|
}
|
|
|
|
// Don't do something after an error, interrupt or throw in the try
|
|
// block, catch clause, or finally clause preceding this ":endtry" or
|
|
// when an error or interrupt occurred after a ":continue", ":break",
|
|
// ":return", or ":finish" in a try block or catch clause preceding this
|
|
// ":endtry" or when the try block never got active (because of an
|
|
// inactive surrounding conditional or after an error or interrupt or
|
|
// throw) or when there is a surrounding conditional and it has been
|
|
// made inactive by a ":continue", ":break", ":return", or ":finish" in
|
|
// the finally clause. The latter case need not be tested since then
|
|
// anything pending has already been discarded.
|
|
bool skip = did_emsg || got_int || did_throw || !(cstack->cs_flags[cstack->cs_idx] & CSF_TRUE);
|
|
|
|
if (!(cstack->cs_flags[cstack->cs_idx] & CSF_TRY)) {
|
|
eap->errmsg = get_end_emsg(cstack);
|
|
|
|
// Find the matching ":try" and report what's missing.
|
|
rewind_conditionals(cstack, idx, CSF_WHILE | CSF_FOR,
|
|
&cstack->cs_looplevel);
|
|
skip = true;
|
|
|
|
// If an exception is being thrown, discard it to prevent it from
|
|
// being rethrown at the end of this function. It would be
|
|
// discarded by the error message, anyway. Resets did_throw.
|
|
// This does not affect the script termination due to the error
|
|
// since "trylevel" is decremented after emsg() has been called.
|
|
if (did_throw) {
|
|
discard_current_exception();
|
|
}
|
|
|
|
// report eap->errmsg, also when there already was an error
|
|
did_emsg = false;
|
|
} else {
|
|
idx = cstack->cs_idx;
|
|
|
|
// If we stopped with the exception currently being thrown at this
|
|
// try conditional since we didn't know that it doesn't have
|
|
// a finally clause, we need to rethrow it after closing the try
|
|
// conditional.
|
|
if (did_throw
|
|
&& (cstack->cs_flags[idx] & CSF_TRUE)
|
|
&& !(cstack->cs_flags[idx] & CSF_FINALLY)) {
|
|
rethrow = true;
|
|
}
|
|
}
|
|
|
|
// If there was no finally clause, show the user when debugging or
|
|
// a breakpoint was encountered that the end of the try conditional has
|
|
// been reached: display the debug prompt (if not already done). Do
|
|
// this on normal control flow or when an exception was thrown, but not
|
|
// on an interrupt or error not converted to an exception or when
|
|
// a ":break", ":continue", ":return", or ":finish" is pending. These
|
|
// actions are carried out immediately.
|
|
if ((rethrow || (!skip
|
|
&& !(cstack->cs_flags[idx] & CSF_FINALLY)
|
|
&& !cstack->cs_pending[idx]))
|
|
&& dbg_check_skipped(eap)) {
|
|
// Handle a ">quit" debug command as if an interrupt had occurred
|
|
// before the ":endtry". That is, throw an interrupt exception and
|
|
// set "skip" and "rethrow".
|
|
if (got_int) {
|
|
skip = true;
|
|
(void)do_intthrow(cstack);
|
|
// The do_intthrow() call may have reset did_throw or
|
|
// cstack->cs_pending[idx].
|
|
rethrow = false;
|
|
if (did_throw && !(cstack->cs_flags[idx] & CSF_FINALLY)) {
|
|
rethrow = true;
|
|
}
|
|
}
|
|
}
|
|
|
|
// If a ":return" is pending, we need to resume it after closing the
|
|
// try conditional; remember the return value. If there was a finally
|
|
// clause making an exception pending, we need to rethrow it. Make it
|
|
// the exception currently being thrown.
|
|
if (!skip) {
|
|
pending = cstack->cs_pending[idx];
|
|
cstack->cs_pending[idx] = CSTP_NONE;
|
|
if (pending == CSTP_RETURN) {
|
|
rettv = cstack->cs_rettv[idx];
|
|
} else if (pending & CSTP_THROW) {
|
|
current_exception = cstack->cs_exception[idx];
|
|
}
|
|
}
|
|
|
|
// Discard anything pending on an error, interrupt, or throw in the
|
|
// finally clause. If there was no ":finally", discard a pending
|
|
// ":continue", ":break", ":return", or ":finish" if an error or
|
|
// interrupt occurred afterwards, but before the ":endtry" was reached.
|
|
// If an exception was caught by the last of the catch clauses and there
|
|
// was no finally clause, finish the exception now. This happens also
|
|
// after errors except when this ":endtry" is not within a ":try".
|
|
// Restore "emsg_silent" if it has been reset by this try conditional.
|
|
(void)cleanup_conditionals(cstack, CSF_TRY | CSF_SILENT, true);
|
|
|
|
if (cstack->cs_idx >= 0 && (cstack->cs_flags[cstack->cs_idx] & CSF_TRY)) {
|
|
cstack->cs_idx--;
|
|
}
|
|
cstack->cs_trylevel--;
|
|
|
|
if (!skip) {
|
|
report_resume_pending(pending,
|
|
(pending == CSTP_RETURN) ? rettv :
|
|
(pending & CSTP_THROW) ? (void *)current_exception : NULL);
|
|
switch (pending) {
|
|
case CSTP_NONE:
|
|
break;
|
|
|
|
// Reactivate a pending ":continue", ":break", ":return",
|
|
// ":finish" from the try block or a catch clause of this try
|
|
// conditional. This is skipped, if there was an error in an
|
|
// (unskipped) conditional command or an interrupt afterwards
|
|
// or if the finally clause is present and executed a new error,
|
|
// interrupt, throw, ":continue", ":break", ":return", or
|
|
// ":finish".
|
|
case CSTP_CONTINUE:
|
|
ex_continue(eap);
|
|
break;
|
|
case CSTP_BREAK:
|
|
ex_break(eap);
|
|
break;
|
|
case CSTP_RETURN:
|
|
do_return(eap, false, false, rettv);
|
|
break;
|
|
case CSTP_FINISH:
|
|
do_finish(eap, false);
|
|
break;
|
|
|
|
// When the finally clause was entered due to an error,
|
|
// interrupt or throw (as opposed to a ":continue", ":break",
|
|
// ":return", or ":finish"), restore the pending values of
|
|
// did_emsg, got_int, and did_throw. This is skipped, if there
|
|
// was a new error, interrupt, throw, ":continue", ":break",
|
|
// ":return", or ":finish". in the finally clause.
|
|
default:
|
|
if (pending & CSTP_ERROR) {
|
|
did_emsg = true;
|
|
}
|
|
if (pending & CSTP_INTERRUPT) {
|
|
got_int = true;
|
|
}
|
|
if (pending & CSTP_THROW) {
|
|
rethrow = true;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (rethrow) {
|
|
// Rethrow the current exception (within this cstack).
|
|
do_throw(cstack);
|
|
}
|
|
}
|
|
|
|
// enter_cleanup() and leave_cleanup()
|
|
//
|
|
// Functions to be called before/after invoking a sequence of autocommands for
|
|
// cleanup for a failed command. (Failure means here that a call to emsg()
|
|
// has been made, an interrupt occurred, or there is an uncaught exception
|
|
// from a previous autocommand execution of the same command.)
|
|
//
|
|
// Call enter_cleanup() with a pointer to a cleanup_T and pass the same
|
|
// pointer to leave_cleanup(). The cleanup_T structure stores the pending
|
|
// error/interrupt/exception state.
|
|
|
|
/// This function works a bit like ex_finally() except that there was not
|
|
/// actually an extra try block around the part that failed and an error or
|
|
/// interrupt has not (yet) been converted to an exception. This function
|
|
/// saves the error/interrupt/ exception state and prepares for the call to
|
|
/// do_cmdline() that is going to be made for the cleanup autocommand
|
|
/// execution.
|
|
void enter_cleanup(cleanup_T *csp)
|
|
{
|
|
int pending = CSTP_NONE;
|
|
|
|
// Postpone did_emsg, got_int, did_throw. The pending values will be
|
|
// restored by leave_cleanup() except if there was an aborting error,
|
|
// interrupt, or uncaught exception after this function ends.
|
|
if (did_emsg || got_int || did_throw || need_rethrow) {
|
|
csp->pending = (did_emsg ? CSTP_ERROR : 0)
|
|
| (got_int ? CSTP_INTERRUPT : 0)
|
|
| (did_throw ? CSTP_THROW : 0)
|
|
| (need_rethrow ? CSTP_THROW : 0);
|
|
|
|
// If we are currently throwing an exception (did_throw), save it as
|
|
// well. On an error not yet converted to an exception, update
|
|
// "force_abort" and reset "cause_abort" (as do_errthrow() would do).
|
|
// This is needed for the do_cmdline() call that is going to be made
|
|
// for autocommand execution. We need not save *msg_list because
|
|
// there is an extra instance for every call of do_cmdline(), anyway.
|
|
if (did_throw || need_rethrow) {
|
|
csp->exception = current_exception;
|
|
current_exception = NULL;
|
|
} else {
|
|
csp->exception = NULL;
|
|
if (did_emsg) {
|
|
force_abort |= cause_abort;
|
|
cause_abort = false;
|
|
}
|
|
}
|
|
did_emsg = got_int = did_throw = need_rethrow = false;
|
|
|
|
// Report if required by the 'verbose' option or when debugging.
|
|
report_make_pending(pending, csp->exception);
|
|
} else {
|
|
csp->pending = CSTP_NONE;
|
|
csp->exception = NULL;
|
|
}
|
|
}
|
|
|
|
/// This function is a bit like ex_endtry() except that there was not actually
|
|
/// an extra try block around the part that failed and an error or interrupt
|
|
/// had not (yet) been converted to an exception when the cleanup autocommand
|
|
/// sequence was invoked.
|
|
///
|
|
/// See comment above enter_cleanup() for how this function is used.
|
|
///
|
|
/// This function has to be called with the address of the cleanup_T structure
|
|
/// filled by enter_cleanup() as an argument; it restores the error/interrupt/
|
|
/// exception state saved by that function - except there was an aborting
|
|
/// error, an interrupt or an uncaught exception during execution of the
|
|
/// cleanup autocommands. In the latter case, the saved error/interrupt/
|
|
/// exception state is discarded.
|
|
void leave_cleanup(cleanup_T *csp)
|
|
{
|
|
int pending = csp->pending;
|
|
|
|
if (pending == CSTP_NONE) { // nothing to do
|
|
return;
|
|
}
|
|
|
|
// If there was an aborting error, an interrupt, or an uncaught exception
|
|
// after the corresponding call to enter_cleanup(), discard what has been
|
|
// made pending by it. Report this to the user if required by the
|
|
// 'verbose' option or when debugging.
|
|
if (aborting() || need_rethrow) {
|
|
if (pending & CSTP_THROW) {
|
|
// Cancel the pending exception (includes report).
|
|
discard_exception(csp->exception, false);
|
|
} else {
|
|
report_discard_pending(pending, NULL);
|
|
}
|
|
|
|
// If an error was about to be converted to an exception when
|
|
// enter_cleanup() was called, free the message list.
|
|
if (msg_list != NULL) {
|
|
free_global_msglist();
|
|
}
|
|
} else {
|
|
// If there was no new error, interrupt, or throw between the calls
|
|
// to enter_cleanup() and leave_cleanup(), restore the pending
|
|
// error/interrupt/exception state.
|
|
|
|
// If there was an exception being thrown when enter_cleanup() was
|
|
// called, we need to rethrow it. Make it the exception currently
|
|
// being thrown.
|
|
if (pending & CSTP_THROW) {
|
|
current_exception = csp->exception;
|
|
} else if (pending & CSTP_ERROR) {
|
|
// If an error was about to be converted to an exception when
|
|
// enter_cleanup() was called, let "cause_abort" take the part of
|
|
// "force_abort" (as done by cause_errthrow()).
|
|
cause_abort = force_abort;
|
|
force_abort = false;
|
|
}
|
|
|
|
// Restore the pending values of did_emsg, got_int, and did_throw.
|
|
if (pending & CSTP_ERROR) {
|
|
did_emsg = true;
|
|
}
|
|
if (pending & CSTP_INTERRUPT) {
|
|
got_int = true;
|
|
}
|
|
if (pending & CSTP_THROW) {
|
|
need_rethrow = true; // did_throw will be set by do_one_cmd()
|
|
}
|
|
|
|
// Report if required by the 'verbose' option or when debugging.
|
|
report_resume_pending(pending, ((pending & CSTP_THROW) ? (void *)current_exception : NULL));
|
|
}
|
|
}
|
|
|
|
/// Make conditionals inactive and discard what's pending in finally clauses
|
|
/// until the conditional type searched for or a try conditional not in its
|
|
/// finally clause is reached. If this is in an active catch clause, finish
|
|
/// the caught exception.
|
|
///
|
|
///
|
|
/// @param searched_cond Possible values are (CSF_WHILE | CSF_FOR) or CSF_TRY or 0,
|
|
/// the latter meaning the innermost try conditional not
|
|
/// in its finally clause.
|
|
/// @param inclusive tells whether the conditional searched for should be made
|
|
/// inactive itself (a try conditional not in its finally
|
|
/// clause possibly find before is always made inactive).
|
|
///
|
|
/// If "inclusive" is true and "searched_cond" is CSF_TRY|CSF_SILENT, the saved
|
|
/// former value of "emsg_silent", if reset when the try conditional finally
|
|
/// reached was entered, is restored (used by ex_endtry()). This is normally
|
|
/// done only when such a try conditional is left.
|
|
///
|
|
/// @return the cstack index where the search stopped.
|
|
int cleanup_conditionals(cstack_T *cstack, int searched_cond, int inclusive)
|
|
{
|
|
int idx;
|
|
int stop = false;
|
|
|
|
for (idx = cstack->cs_idx; idx >= 0; idx--) {
|
|
if (cstack->cs_flags[idx] & CSF_TRY) {
|
|
// Discard anything pending in a finally clause and continue the
|
|
// search. There may also be a pending ":continue", ":break",
|
|
// ":return", or ":finish" before the finally clause. We must not
|
|
// discard it, unless an error or interrupt occurred afterwards.
|
|
if (did_emsg || got_int || (cstack->cs_flags[idx] & CSF_FINALLY)) {
|
|
switch (cstack->cs_pending[idx]) {
|
|
case CSTP_NONE:
|
|
break;
|
|
|
|
case CSTP_CONTINUE:
|
|
case CSTP_BREAK:
|
|
case CSTP_FINISH:
|
|
report_discard_pending(cstack->cs_pending[idx], NULL);
|
|
cstack->cs_pending[idx] = CSTP_NONE;
|
|
break;
|
|
|
|
case CSTP_RETURN:
|
|
report_discard_pending(CSTP_RETURN,
|
|
cstack->cs_rettv[idx]);
|
|
discard_pending_return(cstack->cs_rettv[idx]);
|
|
cstack->cs_pending[idx] = CSTP_NONE;
|
|
break;
|
|
|
|
default:
|
|
if (cstack->cs_flags[idx] & CSF_FINALLY) {
|
|
if ((cstack->cs_pending[idx] & CSTP_THROW) && cstack->cs_exception[idx] != NULL) {
|
|
// Cancel the pending exception. This is in the
|
|
// finally clause, so that the stack of the
|
|
// caught exceptions is not involved.
|
|
discard_exception((except_T *)cstack->cs_exception[idx], false);
|
|
} else {
|
|
report_discard_pending(cstack->cs_pending[idx], NULL);
|
|
}
|
|
cstack->cs_pending[idx] = CSTP_NONE;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
// Stop at a try conditional not in its finally clause. If this try
|
|
// conditional is in an active catch clause, finish the caught
|
|
// exception.
|
|
if (!(cstack->cs_flags[idx] & CSF_FINALLY)) {
|
|
if ((cstack->cs_flags[idx] & CSF_ACTIVE)
|
|
&& (cstack->cs_flags[idx] & CSF_CAUGHT) && !(cstack->cs_flags[idx] & CSF_FINISHED)) {
|
|
finish_exception((except_T *)cstack->cs_exception[idx]);
|
|
cstack->cs_flags[idx] |= CSF_FINISHED;
|
|
}
|
|
// Stop at this try conditional - except the try block never
|
|
// got active (because of an inactive surrounding conditional
|
|
// or when the ":try" appeared after an error or interrupt or
|
|
// throw).
|
|
if (cstack->cs_flags[idx] & CSF_TRUE) {
|
|
if (searched_cond == 0 && !inclusive) {
|
|
break;
|
|
}
|
|
stop = true;
|
|
}
|
|
}
|
|
}
|
|
|
|
// Stop on the searched conditional type (even when the surrounding
|
|
// conditional is not active or something has been made pending).
|
|
// If "inclusive" is true and "searched_cond" is CSF_TRY|CSF_SILENT,
|
|
// check first whether "emsg_silent" needs to be restored.
|
|
if (cstack->cs_flags[idx] & searched_cond) {
|
|
if (!inclusive) {
|
|
break;
|
|
}
|
|
stop = true;
|
|
}
|
|
cstack->cs_flags[idx] &= ~CSF_ACTIVE;
|
|
if (stop && searched_cond != (CSF_TRY | CSF_SILENT)) {
|
|
break;
|
|
}
|
|
|
|
// When leaving a try conditional that reset "emsg_silent" on its
|
|
// entry after saving the original value, restore that value here and
|
|
// free the memory used to store it.
|
|
if ((cstack->cs_flags[idx] & CSF_TRY)
|
|
&& (cstack->cs_flags[idx] & CSF_SILENT)) {
|
|
eslist_T *elem;
|
|
|
|
elem = cstack->cs_emsg_silent_list;
|
|
cstack->cs_emsg_silent_list = elem->next;
|
|
emsg_silent = elem->saved_emsg_silent;
|
|
xfree(elem);
|
|
cstack->cs_flags[idx] &= ~CSF_SILENT;
|
|
}
|
|
if (stop) {
|
|
break;
|
|
}
|
|
}
|
|
return idx;
|
|
}
|
|
|
|
/// @return an appropriate error message for a missing endwhile/endfor/endif.
|
|
static char *get_end_emsg(cstack_T *cstack)
|
|
{
|
|
if (cstack->cs_flags[cstack->cs_idx] & CSF_WHILE) {
|
|
return _(e_endwhile);
|
|
}
|
|
if (cstack->cs_flags[cstack->cs_idx] & CSF_FOR) {
|
|
return _(e_endfor);
|
|
}
|
|
return _(e_endif);
|
|
}
|
|
|
|
/// Rewind conditionals until index "idx" is reached. "cond_type" and
|
|
/// "cond_level" specify a conditional type and the address of a level variable
|
|
/// which is to be decremented with each skipped conditional of the specified
|
|
/// type.
|
|
/// Also free "for info" structures where needed.
|
|
void rewind_conditionals(cstack_T *cstack, int idx, int cond_type, int *cond_level)
|
|
{
|
|
while (cstack->cs_idx > idx) {
|
|
if (cstack->cs_flags[cstack->cs_idx] & cond_type) {
|
|
(*cond_level)--;
|
|
}
|
|
if (cstack->cs_flags[cstack->cs_idx] & CSF_FOR) {
|
|
free_for_info(cstack->cs_forinfo[cstack->cs_idx]);
|
|
}
|
|
cstack->cs_idx--;
|
|
}
|
|
}
|
|
|
|
/// Handle ":endfunction" when not after a ":function"
|
|
void ex_endfunction(exarg_T *eap)
|
|
{
|
|
emsg(_("E193: :endfunction not inside a function"));
|
|
}
|
|
|
|
/// @return true if the string "p" looks like a ":while" or ":for" command.
|
|
int has_loop_cmd(char *p)
|
|
{
|
|
int len;
|
|
|
|
// skip modifiers, white space and ':'
|
|
for (;;) {
|
|
while (*p == ' ' || *p == '\t' || *p == ':') {
|
|
p++;
|
|
}
|
|
len = modifier_len(p);
|
|
if (len == 0) {
|
|
break;
|
|
}
|
|
p += len;
|
|
}
|
|
if ((p[0] == 'w' && p[1] == 'h')
|
|
|| (p[0] == 'f' && p[1] == 'o' && p[2] == 'r')) {
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|