Import LLVM 10.0.0 release including clang, lld and lldb.

ok hackroom
tested by plenty

3 files changed, 140 insertions, 0 deletions

diff --git a/gnu/llvm/lldb/packages/Python/lldbsuite/test/linux/thread/create_during_instruction_step/Makefile b/gnu/llvm/lldb/packages/Python/lldbsuite/test/linux/thread/create_during_instruction_step/Makefile
new file mode 100644
index 00000000000..566938ca0cc
--- /dev/null
+++ b/gnu/llvm/lldb/packages/Python/lldbsuite/test/linux/thread/create_during_instruction_step/Makefile
@@ -0,0 +1,3 @@
+CXX_SOURCES := main.cpp
+ENABLE_THREADS := YES
+include Makefile.rules
diff --git a/gnu/llvm/lldb/packages/Python/lldbsuite/test/linux/thread/create_during_instruction_step/TestCreateDuringInstructionStep.py b/gnu/llvm/lldb/packages/Python/lldbsuite/test/linux/thread/create_during_instruction_step/TestCreateDuringInstructionStep.py
new file mode 100644
index 00000000000..c4d6461ddde
--- /dev/null
+++ b/gnu/llvm/lldb/packages/Python/lldbsuite/test/linux/thread/create_during_instruction_step/TestCreateDuringInstructionStep.py
@@ -0,0 +1,83 @@
+"""
+This tests that we do not lose control of the inferior, while doing an instruction-level step
+over a thread creation instruction.
+"""
+
+
+
+import lldb
+from lldbsuite.test.decorators import *
+from lldbsuite.test.lldbtest import *
+from lldbsuite.test import lldbutil
+
+
+class CreateDuringInstructionStepTestCase(TestBase):
+
+    mydir = TestBase.compute_mydir(__file__)
+    NO_DEBUG_INFO_TESTCASE = True
+
+    @skipUnlessPlatform(['linux'])
+    @expectedFailureAndroid('llvm.org/pr24737', archs=['arm'])
+    @expectedFailureAll(
+        oslist=["linux"],
+        archs=["arm"],
+        bugnumber="llvm.org/pr24737")
+    def test_step_inst(self):
+        self.build(dictionary=self.getBuildFlags())
+        exe = self.getBuildArtifact("a.out")
+        target = self.dbg.CreateTarget(exe)
+        self.assertTrue(target and target.IsValid(), "Target is valid")
+
+        # This should create a breakpoint in the stepping thread.
+        breakpoint = target.BreakpointCreateByName("main")
+        self.assertTrue(
+            breakpoint and breakpoint.IsValid(),
+            "Breakpoint is valid")
+
+        # Run the program.
+        process = target.LaunchSimple(
+            None, None, self.get_process_working_directory())
+        self.assertTrue(process and process.IsValid(), PROCESS_IS_VALID)
+
+        # The stop reason of the thread should be breakpoint.
+        self.assertEqual(
+            process.GetState(),
+            lldb.eStateStopped,
+            PROCESS_STOPPED)
+
+        threads = lldbutil.get_threads_stopped_at_breakpoint(
+            process, breakpoint)
+        self.assertEqual(len(threads), 1, STOPPED_DUE_TO_BREAKPOINT)
+
+        thread = threads[0]
+        self.assertTrue(thread and thread.IsValid(), "Thread is valid")
+
+        # Make sure we see only one threads
+        self.assertEqual(
+            process.GetNumThreads(),
+            1,
+            'Number of expected threads and actual threads do not match.')
+
+        # Keep stepping until we see the thread creation
+        while process.GetNumThreads() < 2:
+            thread.StepInstruction(False)
+            self.assertEqual(
+                process.GetState(),
+                lldb.eStateStopped,
+                PROCESS_STOPPED)
+            self.assertEqual(
+                thread.GetStopReason(),
+                lldb.eStopReasonPlanComplete,
+                "Step operation succeeded")
+            if self.TraceOn():
+                self.runCmd("disassemble --pc")
+
+        if self.TraceOn():
+            self.runCmd("thread list")
+
+        # We have successfully caught thread creation. Now just run to
+        # completion
+        process.Continue()
+
+        # At this point, the inferior process should have exited.
+        self.assertEqual(process.GetState(), lldb.eStateExited, PROCESS_EXITED)
diff --git a/gnu/llvm/lldb/packages/Python/lldbsuite/test/linux/thread/create_during_instruction_step/main.cpp b/gnu/llvm/lldb/packages/Python/lldbsuite/test/linux/thread/create_during_instruction_step/main.cpp
new file mode 100644
index 00000000000..4488f2310d5
--- /dev/null
+++ b/gnu/llvm/lldb/packages/Python/lldbsuite/test/linux/thread/create_during_instruction_step/main.cpp
@@ -0,0 +1,54 @@
+//===-- main.cpp ------------------------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// This file deliberately uses low level linux-specific API for thread creation because:
+// - instruction-stepping over thread creation using higher-level functions was very slow
+// - it was also unreliable due to single-stepping bugs unrelated to this test
+// - some threading libraries do not create or destroy threads when we would expect them to
+
+#include <sched.h>
+
+#include <atomic>
+#include <cstdio>
+
+enum { STACK_SIZE = 0x2000 };
+
+static uint8_t child_stack[STACK_SIZE];
+
+pid_t child_tid;
+
+std::atomic<bool> flag(false);
+
+int thread_main(void *)
+{
+    while (! flag) // Make sure the thread does not exit prematurely
+        ;
+
+    return 0;
+}
+
+int main ()
+{
+    int ret = clone(thread_main,
+            child_stack + STACK_SIZE/2, // Don't care whether the stack grows up or down,
+                                        // just point to the middle
+            CLONE_CHILD_CLEARTID | CLONE_FILES | CLONE_FS | CLONE_PARENT_SETTID |
+            CLONE_SIGHAND | CLONE_SYSVSEM | CLONE_THREAD | CLONE_VM,
+            nullptr, // thread_main argument
+            &child_tid);
+
+    if (ret == -1)
+    {
+        perror("clone");
+        return 1;
+    }
+
+    flag = true;
+
+    return 0;
+}