"""
Test PHI nodes work in the IR interpreter.
"""


import lldb
from lldbsuite.test.lldbtest import *
import lldbsuite.test.lldbutil as lldbutil


class IRInterpreterPHINodesTestCase(TestBase):
    def test_phi_node_support(self):
        """Test support for PHI nodes in the IR interpreter."""

        self.build()
        exe = self.getBuildArtifact("a.out")
        self.runCmd("file " + exe, CURRENT_EXECUTABLE_SET)

        # Break on the first assignment to i
        line = line_number("main.cpp", "i = 5")
        lldbutil.run_break_set_by_file_and_line(
            self, "main.cpp", line, num_expected_locations=1, loc_exact=True
        )

        self.runCmd("run", RUN_SUCCEEDED)

        # The stop reason of the thread should be breakpoint
        self.expect(
            "thread list",
            STOPPED_DUE_TO_BREAKPOINT,
            substrs=["stopped", "stop reason = breakpoint"],
        )

        self.runCmd("s")

        # The logical 'or' causes a PHI node to be generated. Execute without JIT
        # to test that the interpreter can handle this
        self.expect("expr -j 0 -- i == 3 || i == 5", substrs=["true"])

        self.runCmd("s")
        self.expect("expr -j 0 -- i == 3 || i == 5", substrs=["false"])
        self.runCmd("s")
        self.expect("expr -j 0 -- i == 3 || i == 5", substrs=["true"])