https://github.com/jimingham updated
https://github.com/llvm/llvm-project/pull/74894
>From 438d35a7a7fca454718062583f91776ca018b2b1 Mon Sep 17 00:00:00 2001
From: Jim Ingham <jing...@apple.com>
Date: Fri, 8 Dec 2023 14:43:14 -0800
Subject: [PATCH 1/2] Add a test for evicting unreachable modules from the
global module cache.
---
.../python_api/global_module_cache/Makefile | 1 +
.../TestGlobalModuleCache.py | 110 ++++++++++++++++++
.../global_module_cache/one-print.c | 8 ++
.../global_module_cache/two-print.c | 9 ++
4 files changed, 128 insertions(+)
create mode 100644 lldb/test/API/python_api/global_module_cache/Makefile
create mode 100644
lldb/test/API/python_api/global_module_cache/TestGlobalModuleCache.py
create mode 100644 lldb/test/API/python_api/global_module_cache/one-print.c
create mode 100644 lldb/test/API/python_api/global_module_cache/two-print.c
diff --git a/lldb/test/API/python_api/global_module_cache/Makefile
b/lldb/test/API/python_api/global_module_cache/Makefile
new file mode 100644
index 0000000000000..22f1051530f87
--- /dev/null
+++ b/lldb/test/API/python_api/global_module_cache/Makefile
@@ -0,0 +1 @@
+include Makefile.rules
diff --git
a/lldb/test/API/python_api/global_module_cache/TestGlobalModuleCache.py
b/lldb/test/API/python_api/global_module_cache/TestGlobalModuleCache.py
new file mode 100644
index 0000000000000..ff74d09a12818
--- /dev/null
+++ b/lldb/test/API/python_api/global_module_cache/TestGlobalModuleCache.py
@@ -0,0 +1,110 @@
+"""
+Test the use of the global module cache in lldb
+"""
+
+import lldb
+
+from lldbsuite.test.decorators import *
+from lldbsuite.test.lldbtest import *
+from lldbsuite.test import lldbutil
+import os
+import shutil
+from pathlib import Path
+import time
+
+
+class GlobalModuleCacheTestCase(TestBase):
+ # NO_DEBUG_INFO_TESTCASE = True
+
+ def check_counter_var(self, thread, value):
+ frame = thread.frames[0]
+ var = frame.FindVariable("counter")
+ self.assertTrue(var.GetError().Success(), "Got counter variable")
+ self.assertEqual(var.GetValueAsUnsigned(), value, "This was one-print")
+
+ def copy_to_main(self, src, dst):
+ # We are relying on the source file being newer than the .o file from
+ # a previous build, so sleep a bit here to ensure that the touch is
later.
+ time.sleep(2)
+ try:
+ shutil.copy(src, dst)
+ except:
+ self.fail(f"Could not copy {src} to {dst}")
+ Path(dst).touch()
+
+ # The rerun tests indicate rerunning on Windows doesn't really work, so
+ # this one won't either.
+ @skipIfWindows
+ def test_OneTargetOneDebugger(self):
+ # Make sure that if we have one target, and we run, then
+ # change the binary and rerun, the binary (and any .o files
+ # if using dwarf in .o file debugging) get removed from the
+ # shared module cache. They are no longer reachable.
+ debug_style = self.getDebugInfo()
+
+ # Before we do anything, clear the global module cache so we don't
+ # see objects from other runs:
+ lldb.SBDebugger.MemoryPressureDetected()
+
+ # Set up the paths for our two versions of main.c:
+ main_c_path = os.path.join(self.getBuildDir(), "main.c")
+ one_print_path = os.path.join(self.getSourceDir(), "one-print.c")
+ two_print_path = os.path.join(self.getSourceDir(), "two-print.c")
+ main_filespec = lldb.SBFileSpec(main_c_path)
+
+ # First copy the one-print.c to main.c in the build folder and
+ # build our a.out from there:
+ self.copy_to_main(one_print_path, main_c_path)
+ self.build(dictionary={"C_SOURCES": main_c_path, "EXE": "a.out"})
+
+ (target, process, thread, bkpt) = lldbutil.run_to_source_breakpoint(
+ self, "return counter;", main_filespec
+ )
+
+ # Make sure we ran the version we intended here:
+ self.check_counter_var(thread, 1)
+ process.Kill()
+
+ # Now copy two-print.c over main.c, rebuild, and rerun:
+ # os.unlink(target.GetExecutable().fullpath)
+ self.copy_to_main(two_print_path, main_c_path)
+
+ self.build(dictionary={"C_SOURCES": main_c_path, "EXE": "a.out"})
+ error = lldb.SBError()
+ (_, process, thread, _) = lldbutil.run_to_breakpoint_do_run(self,
target, bkpt)
+ # In two-print.c counter will be 2:
+ self.check_counter_var(thread, 2)
+
+ num_a_dot_out_entries = 1
+ # For dSYM's there will be two lines of output, one for the a.out and
one
+ # for the dSYM.
+ if debug_style == "dsym":
+ num_a_dot_out_entries += 1
+
+ self.check_image_list_result(num_a_dot_out_entries, 1)
+
+ def check_image_list_result(self, num_a_dot_out, num_main_dot_o):
+ # Now look at the global module list, there should only be one a.out,
and if we are
+ # doing dwarf in .o file, there should only be one .o file:
+ image_cmd_result = lldb.SBCommandReturnObject()
+ interp = self.dbg.GetCommandInterpreter()
+ interp.HandleCommand("image list -g", image_cmd_result)
+ image_list_str = image_cmd_result.GetOutput()
+ image_list = image_list_str.splitlines()
+ found_a_dot_out = 0
+ found_main_dot_o = 0
+
+ for line in image_list:
+ # FIXME: force this to be at the end of the string:
+ if "a.out" in line:
+ found_a_dot_out += 1
+ if "main.o" in line:
+ found_main_dot_o += 1
+
+ self.assertEqual(
+ num_a_dot_out, found_a_dot_out, "Got the right number of a.out's"
+ )
+ if found_main_dot_o > 0:
+ self.assertEqual(
+ num_main_dot_o, found_main_dot_o, "Got the right number of
main.o's"
+ )
diff --git a/lldb/test/API/python_api/global_module_cache/one-print.c
b/lldb/test/API/python_api/global_module_cache/one-print.c
new file mode 100644
index 0000000000000..5a572ca7c65fe
--- /dev/null
+++ b/lldb/test/API/python_api/global_module_cache/one-print.c
@@ -0,0 +1,8 @@
+#include <stdio.h>
+
+int
+main() {
+ int counter = 0;
+ printf("I only print one time: %d.\n", counter++);
+ return counter;
+}
diff --git a/lldb/test/API/python_api/global_module_cache/two-print.c
b/lldb/test/API/python_api/global_module_cache/two-print.c
new file mode 100644
index 0000000000000..ce6cb84c5c46e
--- /dev/null
+++ b/lldb/test/API/python_api/global_module_cache/two-print.c
@@ -0,0 +1,9 @@
+#include <stdio.h>
+
+int
+main() {
+ int counter = 0;
+ printf("I print one time: %d.\n", counter++);
+ printf("I print two times: %d.\n", counter++);
+ return counter;
+}
>From 684cee4a363c87c6b2cfa0776adb7c5923a0f6b6 Mon Sep 17 00:00:00 2001
From: Jim Ingham <jing...@apple.com>
Date: Mon, 11 Dec 2023 15:54:38 -0800
Subject: [PATCH 2/2] Add a test for one target with the old file and one with
the new.
---
.../TestGlobalModuleCache.py | 22 +++++++++++++++++--
1 file changed, 20 insertions(+), 2 deletions(-)
diff --git
a/lldb/test/API/python_api/global_module_cache/TestGlobalModuleCache.py
b/lldb/test/API/python_api/global_module_cache/TestGlobalModuleCache.py
index ff74d09a12818..db84c5a2d24d3 100644
--- a/lldb/test/API/python_api/global_module_cache/TestGlobalModuleCache.py
+++ b/lldb/test/API/python_api/global_module_cache/TestGlobalModuleCache.py
@@ -36,6 +36,13 @@ def copy_to_main(self, src, dst):
# this one won't either.
@skipIfWindows
def test_OneTargetOneDebugger(self):
+ self.do_test_one_debugger(True)
+
+ @expectedFailureAll
+ def test_TwoTargetsOneDebugger(self):
+ self.do_test_one_debugger(False)
+
+ def do_test_one_debugger(self, one_target):
# Make sure that if we have one target, and we run, then
# change the binary and rerun, the binary (and any .o files
# if using dwarf in .o file debugging) get removed from the
@@ -71,10 +78,21 @@ def test_OneTargetOneDebugger(self):
self.build(dictionary={"C_SOURCES": main_c_path, "EXE": "a.out"})
error = lldb.SBError()
- (_, process, thread, _) = lldbutil.run_to_breakpoint_do_run(self,
target, bkpt)
+ if one_target:
+ (_, process, thread, _) = lldbutil.run_to_breakpoint_do_run(self,
target, bkpt)
+ else:
+ (target2, process2, thread, bkpt) =
lldbutil.run_to_source_breakpoint(
+ self, "return counter;", main_filespec
+ )
+
# In two-print.c counter will be 2:
self.check_counter_var(thread, 2)
+ # If we made two targets, destroy the first one, that should free up
the
+ # unreachable Modules:
+ if not one_target:
+ target.Clear()
+
num_a_dot_out_entries = 1
# For dSYM's there will be two lines of output, one for the a.out and
one
# for the dSYM.
@@ -82,7 +100,7 @@ def test_OneTargetOneDebugger(self):
num_a_dot_out_entries += 1
self.check_image_list_result(num_a_dot_out_entries, 1)
-
+
def check_image_list_result(self, num_a_dot_out, num_main_dot_o):
# Now look at the global module list, there should only be one a.out,
and if we are
# doing dwarf in .o file, there should only be one .o file:
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