Fix "thread step until" handling of multiple line inputs.

Also document that it handles same, and add some tests.

llvm-svn: 287386

lldb/packages/Python/lldbsuite/test/functionalities/thread/step_until/Makefile

@@ -0,0 +1,5 @@
+LEVEL = ../../../make
+
+C_SOURCES := main.c
+
+include $(LEVEL)/Makefile.rules

lldb/packages/Python/lldbsuite/test/functionalities/thread/step_until/TestStepUntil.py

@@ -0,0 +1,92 @@
+"""Test stepping over vrs. hitting breakpoints & subsequent stepping in various forms."""
+
+from __future__ import print_function
+
+
+import os
+import time
+import lldb
+from lldbsuite.test.decorators import *
+from lldbsuite.test.lldbtest import *
+from lldbsuite.test import lldbutil
+
+
+class TestCStepping(TestBase):
+
+    mydir = TestBase.compute_mydir(__file__)
+
+    def getCategories(self):
+        return ['basic_process']
+
+    def setUp(self):
+        # Call super's setUp().
+        TestBase.setUp(self)
+        # Find the line numbers that we will step to in main:
+        self.main_source = "main.c"
+        self.less_than_two = line_number('main.c', 'Less than 2')
+        self.greater_than_two = line_number('main.c', 'Greater than or equal to 2.')
+        self.back_out_in_main = line_number('main.c', 'Back out in main')
+
+    def do_until (self, args, until_lines, expected_linenum):
+        self.build()
+        exe = os.path.join(os.getcwd(), "a.out")
+
+        target = self.dbg.CreateTarget(exe)
+        self.assertTrue(target, VALID_TARGET)
+
+        main_source_spec = lldb.SBFileSpec(self.main_source)
+        break_before = target.BreakpointCreateBySourceRegex(
+            'At the start',
+            main_source_spec)
+        self.assertTrue(break_before, VALID_BREAKPOINT)
+
+        # Now launch the process, and do not stop at entry point.
+        process = target.LaunchSimple(
+            args, None, self.get_process_working_directory())
+
+        self.assertTrue(process, PROCESS_IS_VALID)
+
+        # The stop reason of the thread should be breakpoint.
+        threads = lldbutil.get_threads_stopped_at_breakpoint(
+            process, break_before)
+
+        if len(threads) != 1:
+            self.fail("Failed to stop at first breakpoint in main.")
+
+        thread = threads[0]
+        return thread
+
+        thread = self.common_setup(None)
+
+        cmd_interp = self.dbg.GetCommandInterpreter()
+        ret_obj = lldb.SBCommandReturnObject()
+
+        cmd_line = "thread until"
+        for line_num in until_lines:
+            cmd_line += " %d"%(line_num)
+ 
+        cmd_interp.HandleCommand(cmd_line, ret_obj)
+        self.assertTrue(ret_obj.Succeeded(), "'%s' failed: %s."%(cmd_line, ret_obj.GetError()))
+
+        frame = thread.frames[0]
+        line = frame.GetLineEntry().GetLine()
+        self.assertEqual(line, expected_linenum, 'Did not get the expected stop line number')
+
+    def test_hitting_one (self):
+        """Test thread step until - targeting one line and hitting it."""
+        self.do_until(None, [self.less_than_two], self.less_than_two)
+
+    def test_targetting_two_hitting_first (self):
+        """Test thread step until - targeting two lines and hitting one."""
+        self.do_until(["foo", "bar", "baz"], [self.less_than_two, self.greater_than_two], self.greater_than_two)
+
+    def test_targetting_two_hitting_second (self):
+        """Test thread step until - targeting two lines and hitting the other one."""
+        self.do_until(None, [self.less_than_two, self.greater_than_two], self.less_than_two)
+
+    def test_missing_one (self):
+        """Test thread step until - targeting one line and missing it."""
+        self.do_until(["foo", "bar", "baz"], [self.less_than_two], self.back_out_in_main)
+
+
+

lldb/packages/Python/lldbsuite/test/functionalities/thread/step_until/main.c

@@ -0,0 +1,20 @@
+#include <stdio.h>
+
+void call_me(int argc)
+{
+  printf ("At the start, argc: %d.\n", argc);
+
+  if (argc < 2)
+    printf("Less than 2.\n");
+  else
+    printf("Greater than or equal to 2.\n");
+}
+
+int
+main(int argc, char **argv)
+{
+  call_me(argc);
+  printf("Back out in main.\n");
+
+  return 0;
+}

lldb/source/Commands/CommandObjectThread.cpp

@@ -977,7 +977,9 @@ public:
             interpreter, "thread until",
             "Continue until a line number or address is reached by the "
             "current or specified thread.  Stops when returning from "
-            "the current function as a safety measure.",
+            "the current function as a safety measure.  "
+            "The target line number(s) are given as arguments, and if more than one"
+            " is provided, stepping will stop when the first one is hit.",
             nullptr,
             eCommandRequiresThread | eCommandTryTargetAPILock |
                 eCommandProcessMustBeLaunched | eCommandProcessMustBePaused),
@@ -1025,11 +1027,11 @@ protected:
         size_t num_args = command.GetArgumentCount();
         for (size_t i = 0; i < num_args; i++) {
           uint32_t line_number;
-          line_number = StringConvert::ToUInt32(command.GetArgumentAtIndex(0),
+          line_number = StringConvert::ToUInt32(command.GetArgumentAtIndex(i),
                                                 UINT32_MAX);
           if (line_number == UINT32_MAX) {
             result.AppendErrorWithFormat("invalid line number: '%s'.\n",
-                                         command.GetArgumentAtIndex(0));
+                                         command.GetArgumentAtIndex(i));
             result.SetStatus(eReturnStatusFailed);
             return false;
           } else