From 0ae962735fe3f58cd36bface32a4268bc7493178 Mon Sep 17 00:00:00 2001
From: Greg Clayton <gclayton@apple.com>
Date: Thu, 24 Mar 2011 23:53:38 +0000
Subject: Made the lldb_private::Opcode struct into a real boy... I mean class.

Modified the Disassembler::Instruction base class to contain an Opcode
instance so that we can know the bytes for an instruction without needing
to keep the data around.

Modified the DisassemblerLLVM's instruction class to correctly extract the
opcode bytes if all goes well.

llvm-svn: 128248
---
 .../Plugins/Disassembler/llvm/DisassemblerLLVM.cpp | 45 ++++++++++++++++++----
 1 file changed, 38 insertions(+), 7 deletions(-)

(limited to 'lldb/source/Plugins/Disassembler/llvm/DisassemblerLLVM.cpp')

diff --git a/lldb/source/Plugins/Disassembler/llvm/DisassemblerLLVM.cpp b/lldb/source/Plugins/Disassembler/llvm/DisassemblerLLVM.cpp
index ca51db346fc..9835dea6675 100644
--- a/lldb/source/Plugins/Disassembler/llvm/DisassemblerLLVM.cpp
+++ b/lldb/source/Plugins/Disassembler/llvm/DisassemblerLLVM.cpp
@@ -32,7 +32,7 @@ using namespace lldb_private;
 
 
 static int 
-DataExtractorByteReader(uint8_t *byte, uint64_t address, void *arg)
+DataExtractorByteReader (uint8_t *byte, uint64_t address, void *arg)
 {
     DataExtractor &extractor = *((DataExtractor *)arg);
 
@@ -74,7 +74,7 @@ static int IPRegisterReader(uint64_t *value, unsigned regID, void* arg)
     return -1;
 }
 
-DisassemblerLLVM::InstructionLLVM::InstructionLLVM (EDDisassemblerRef disassembler, const Address &addr) :
+DisassemblerLLVM::InstructionLLVM::InstructionLLVM (const Address &addr, EDDisassemblerRef disassembler) :
     Instruction (addr),
     m_disassembler (disassembler)
 {
@@ -334,10 +334,41 @@ DisassemblerLLVM::InstructionLLVM::GetByteSize() const
 }
 
 size_t
-DisassemblerLLVM::InstructionLLVM::Extract(const DataExtractor &data, uint32_t data_offset)
+DisassemblerLLVM::InstructionLLVM::Extract (const Disassembler &disassembler, 
+                                            const lldb_private::DataExtractor &data,
+                                            uint32_t data_offset)
 {
     if (EDCreateInsts(&m_inst, 1, m_disassembler, DataExtractorByteReader, data_offset, (void*)(&data)))
-        return EDInstByteSize(m_inst);
+    {
+        const int byte_size = EDInstByteSize(m_inst);
+        uint32_t offset = data_offset;
+        // Make a copy of the opcode in m_opcode
+        switch (disassembler.GetArchitecture().GetMachine())
+        {
+        case llvm::Triple::x86:
+        case llvm::Triple::x86_64:
+            m_opcode.SetOpcodeBytes (data.PeekData (data_offset, byte_size), byte_size);
+            break;
+
+        case llvm::Triple::arm:
+            assert (byte_size == 4);
+            m_opcode.SetOpcode32 (data.GetU32 (&offset));
+            break;
+
+        case llvm::Triple::thumb:
+            assert ((byte_size == 2) || (byte_size == 4));
+            if (byte_size == 2)
+                m_opcode.SetOpcode16 (data.GetU16 (&offset));
+            else
+                m_opcode.SetOpcode32 (data.GetU32 (&offset));
+            break;
+
+        default:
+            assert (!"This shouldn't happen since we control the architecture we allow DisassemblerLLVM to be created for");
+            break;
+        }
+        return byte_size;
+    }
     else
         return 0;
 }
@@ -430,10 +461,10 @@ DisassemblerLLVM::DecodeInstructions
             if (inst_addr.GetAddressClass () == eAddressClassCodeAlternateISA)
                 use_thumb = true;
         }
-        InstructionSP inst_sp (new InstructionLLVM (use_thumb ? m_disassembler_thumb : m_disassembler, 
-                                                    inst_addr));
+        InstructionSP inst_sp (new InstructionLLVM (inst_addr, 
+                                                    use_thumb ? m_disassembler_thumb : m_disassembler));
 
-        size_t inst_byte_size = inst_sp->Extract (data, data_offset);
+        size_t inst_byte_size = inst_sp->Extract (*this, data, data_offset);
 
         if (inst_byte_size == 0)
             break;
-- 
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