[Lldb-commits] [PATCH] D126109: [lldb] Fix broken bad-address-breakpoint test

Will Hawkins via Phabricator via lldb-commits lldb-commits at lists.llvm.org
Fri May 20 19:01:31 PDT 2022

hawkinsw created this revision.
hawkinsw added reviewers: teemperor, JDevlieghere.
Herald added a project: All.
hawkinsw requested review of this revision.
Herald added a project: LLDB.
Herald added a subscriber: lldb-commits.

After changing the "fallback" behavior when a user sets a breakpoint
without specifying a module the bad-address-breakpoint test case failed
incorrectly. This patch updates that test case in order to more
thoroughly discover an illegal address and use that as the means for
testing whether a breakpoint set at an illegal address fails to resolve.

  rG LLVM Github Monorepo



Index: lldb/test/API/functionalities/breakpoint/address_breakpoints/TestBadAddressBreakpoints.py
--- lldb/test/API/functionalities/breakpoint/address_breakpoints/TestBadAddressBreakpoints.py
+++ lldb/test/API/functionalities/breakpoint/address_breakpoints/TestBadAddressBreakpoints.py
@@ -27,14 +27,25 @@
                                               "Set a breakpoint here",
-        # Now see if we can read from 0.  If I can't do that, I don't
-        # have a good way to know what an illegal address is...
+        illegal_address = 0x0
         error = lldb.SBError()
-        ptr = process.ReadPointerFromMemory(0x0, error)
+        # Walk through all the memory regions in the process and
+        # find an address that is invalid.
+        ptr = process.ReadPointerFromMemory(illegal_address, error)
+        regions = process.GetMemoryRegions()
+        for region_idx in range(regions.GetSize()):
+            region = lldb.SBMemoryRegionInfo()
+            regions.GetMemoryRegionAtIndex(region_idx, region)
+            if region.GetRegionEnd() > illegal_address:
+                illegal_address = region.GetRegionEnd()
         if not error.Success():
-            bkpt = target.BreakpointCreateByAddress(0x0)
+            # Now, set a breakpoint at the address we know is illegal.
+            bkpt = target.BreakpointCreateByAddress(illegal_address)
+            # Verify that breakpoint is not resolved.
             for bp_loc in bkpt:
                 self.assertEquals(bp_loc.IsResolved(), False)

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