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"""
Test specific to MIPS 
"""

from __future__ import print_function

import os, time
import re
import unittest2
import lldb
import lldbsuite.test.lldbutil as lldbutil
from lldbsuite.test.lldbtest import *

class AvoidBreakpointInDelaySlotAPITestCase(TestBase):

    mydir = TestBase.compute_mydir(__file__)

    @skipUnlessArch(archs=re.compile('mips*'))
    def test(self):
        self.build()
        exe = os.path.join(os.getcwd(), "a.out")
        self.expect("file " + exe,
                    patterns = [ "Current executable set to .*a.out.*" ])
        
        # Create a target by the debugger.
        target = self.dbg.CreateTarget(exe)
        self.assertTrue(target, VALID_TARGET)

        breakpoint = target.BreakpointCreateByName('main', 'a.out')
        self.assertTrue(breakpoint and
                        breakpoint.GetNumLocations() == 1,
                        VALID_BREAKPOINT)

        # Now launch the process, and do not stop at entry point.
        process = target.LaunchSimple (None, None, self.get_process_working_directory())
        self.assertTrue(process, PROCESS_IS_VALID)

        list = target.FindFunctions('foo', lldb.eFunctionNameTypeAuto)
        self.assertTrue(list.GetSize() == 1)
        sc = list.GetContextAtIndex(0)
        self.assertTrue(sc.GetSymbol().GetName() == "foo")
        function = sc.GetFunction()
        self.assertTrue(function)
        self.function(function, target)

    def function (self, function, target):
        """Iterate over instructions in function and place a breakpoint on delay slot instruction"""
        # Get the list of all instructions in the function
        insts = function.GetInstructions(target)
        print(insts)
        i = 0
        for inst in insts:
            if (inst.HasDelaySlot()):
                # Remember the address of branch instruction.
                branchinstaddress = inst.GetAddress().GetLoadAddress(target)

                # Get next instruction i.e delay slot instruction.
                delayinst = insts.GetInstructionAtIndex(i+1)
                delayinstaddr = delayinst.GetAddress().GetLoadAddress(target)

                # Set breakpoint on delay slot instruction
                breakpoint = target.BreakpointCreateByAddress(delayinstaddr)

                # Verify the breakpoint.
                self.assertTrue(breakpoint and
                                breakpoint.GetNumLocations() == 1,
                                VALID_BREAKPOINT)
                # Get the location from breakpoint
                location = breakpoint.GetLocationAtIndex(0)

                # Get the address where breakpoint is actually set.
                bpaddr = location.GetLoadAddress()
		
                # Breakpoint address should be adjusted to the address of branch instruction.
                self.assertTrue(branchinstaddress ==  bpaddr)
                i += 1
            else:
                i += 1

if __name__ == '__main__':
    import atexit
    lldb.SBDebugger.Initialize()
    atexit.register(lambda: lldb.SBDebugger.Terminate())
    unittest2.main()