[LLDB] Support GNU-style compressed debug sections (.zdebug)

Patch by Erik Welander!

Differential Revision:  https://reviews.llvm.org/D45628

llvm-svn: 332162

3 files changed, 66 insertions, 0 deletions

diff --git a/lldb/packages/Python/lldbsuite/test/linux/compressed-debug-info/Makefile b/lldb/packages/Python/lldbsuite/test/linux/compressed-debug-info/Makefile
new file mode 100644
index 00000000000..dc7c06fddfe
--- /dev/null
+++ b/lldb/packages/Python/lldbsuite/test/linux/compressed-debug-info/Makefile
@@ -0,0 +1,16 @@
+LEVEL := ../../make
+
+C_SOURCES := a.c
+
+all: compressed.out compressed.gnu.out
+
+compressed.out: a.out
+	$(OBJCOPY) --compress-debug-sections=zlib $< $@
+
+compressed.gnu.out: a.out
+	$(OBJCOPY) --compress-debug-sections=zlib-gnu $< $@
+
+include $(LEVEL)/Makefile.rules
+
+clean::
+	$(RM) -f a.o main compressed.out compressed.gnu.out
diff --git a/lldb/packages/Python/lldbsuite/test/linux/compressed-debug-info/TestCompressedDebugInfo.py b/lldb/packages/Python/lldbsuite/test/linux/compressed-debug-info/TestCompressedDebugInfo.py
new file mode 100644
index 00000000000..f82a2e290a2
--- /dev/null
+++ b/lldb/packages/Python/lldbsuite/test/linux/compressed-debug-info/TestCompressedDebugInfo.py
@@ -0,0 +1,46 @@
+""" Tests that compressed debug info sections are used. """
+import os
+import lldb
+import sys
+from lldbsuite.test.decorators import *
+from lldbsuite.test.lldbtest import *
+from lldbsuite.test import lldbutil
+
+
+class TestCompressedDebugInfo(TestBase):
+  mydir = TestBase.compute_mydir(__file__)
+
+  def setUp(self):
+    TestBase.setUp(self)
+
+  @no_debug_info_test  # Prevent the genaration of the dwarf version of this test
+  @skipUnlessPlatform(["linux"])
+  def test_compressed_debug_info(self):
+    """Tests that the 'frame variable' works with compressed debug info."""
+
+    self.build()
+    process = lldbutil.run_to_source_breakpoint(
+        self, "main", lldb.SBFileSpec("a.c"), exe_name="compressed.out")[1]
+
+    # The process should be stopped at a breakpoint, and the z variable should
+    # be in the top frame.
+    self.assertTrue(process.GetState() == lldb.eStateStopped,
+                    STOPPED_DUE_TO_BREAKPOINT)
+    frame = process.GetThreadAtIndex(0).GetFrameAtIndex(0)
+    self.assertTrue(frame.FindVariable("z").IsValid(), "z is not valid")
+
+  @no_debug_info_test  # Prevent the genaration of the dwarf version of this test
+  @skipUnlessPlatform(["linux"])
+  def test_compressed_debug_info_gnu(self):
+    """Tests that the 'frame variable' works with gnu-style compressed debug info."""
+
+    self.build()
+    process = lldbutil.run_to_source_breakpoint(
+        self, "main", lldb.SBFileSpec("a.c"), exe_name="compressed.gnu.out")[1]
+
+    # The process should be stopped at a breakpoint, and the z variable should
+    # be in the top frame.
+    self.assertTrue(process.GetState() == lldb.eStateStopped,
+                    STOPPED_DUE_TO_BREAKPOINT)
+    frame = process.GetThreadAtIndex(0).GetFrameAtIndex(0)
+    self.assertTrue(frame.FindVariable("z").IsValid(), "z is not valid")
diff --git a/lldb/packages/Python/lldbsuite/test/linux/compressed-debug-info/a.c b/lldb/packages/Python/lldbsuite/test/linux/compressed-debug-info/a.c
new file mode 100644
index 00000000000..9c9dd9f55a9
--- /dev/null
+++ b/lldb/packages/Python/lldbsuite/test/linux/compressed-debug-info/a.c
@@ -0,0 +1,4 @@
+int main() {
+  int z = 2;
+  return z;
+}