[MIPS] Avoid breakpoint in delay slot

    
    SUMMARY:
    This patch implements Target::GetBreakableLoadAddress() method that takes an address
    and checks for any reason there is a better address than this to put a breakpoint on.
    If there is then return that address.
    MIPS uses this method to avoid breakpoint in delay slot.
    
    Reviewers: clayborg, jingham
    Subscribers: jingham, mohit.bhakkad, sagar, jaydeep, nitesh.jain, lldb-commits
    Differential Revision: http://http://reviews.llvm.org/D12184

llvm-svn: 246015

1 files changed, 14 insertions, 0 deletions

diff --git a/lldb/source/Core/Disassembler.cpp b/lldb/source/Core/Disassembler.cpp
index 232d6a52cc6..bb5f106ca61 100644
--- a/lldb/source/Core/Disassembler.cpp
+++ b/lldb/source/Core/Disassembler.cpp
@@ -674,6 +674,13 @@ Instruction::DumpEmulation (const ArchSpec &arch)
     return false;
 }
 
+bool
+Instruction::HasDelaySlot ()
+{
+    // Default is false.
+    return false;
+}
+
 OptionValueSP
 Instruction::ReadArray (FILE *in_file, Stream *out_stream, OptionValue::Type data_type)
 {
@@ -1318,6 +1325,13 @@ PseudoInstruction::DoesBranch ()
     return false;
 }
     
+bool
+PseudoInstruction::HasDelaySlot ()
+{
+    // This is NOT a valid question for a pseudo instruction.
+    return false;
+}
+
 size_t
 PseudoInstruction::Decode (const lldb_private::Disassembler &disassembler,
                            const lldb_private::DataExtractor &data,