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Merge pull request #1910 from Sonicadvance1/LLVMDisassembly_improvements 

Improve the LLVM disassembler in the debug window.
This commit is contained in:
Ryan Houdek 2015-01-21 13:29:47 -06:00
parent ca10ce36cc 95ac48d605
commit a5e9c5e718
1 changed files with 43 additions and 9 deletions
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50
Source/Core/DolphinWX/Debugger/JitWindow.cpp
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@ -49,7 +49,7 @@
class HostDisassemblerLLVM : public HostDisassembler
{
public:
HostDisassemblerLLVM(const std::string host_disasm);
HostDisassemblerLLVM(const std::string host_disasm, int inst_size = -1, const std::string cpu = "");
~HostDisassemblerLLVM()
{
if (m_can_disasm)
@ -59,22 +59,24 @@ public:
private:
bool m_can_disasm;
LLVMDisasmContextRef m_llvm_context;
int m_instruction_size;
std::string DisassembleHostBlock(const u8* code_start, const u32 code_size, u32* host_instructions_count) override;
};
HostDisassemblerLLVM::HostDisassemblerLLVM(const std::string host_disasm)
: m_can_disasm(false)
HostDisassemblerLLVM::HostDisassemblerLLVM(const std::string host_disasm, int inst_size, const std::string cpu)
: m_can_disasm(false), m_instruction_size(inst_size)
{
LLVMInitializeAllTargetInfos();
LLVMInitializeAllTargetMCs();
LLVMInitializeAllDisassemblers();
m_llvm_context = LLVMCreateDisasm(host_disasm.c_str(), nullptr, 0, 0, nullptr);
m_llvm_context = LLVMCreateDisasmCPU(host_disasm.c_str(), cpu.c_str(), nullptr, 0, 0, nullptr);
// Couldn't create llvm context
if (!m_llvm_context)
return;
LLVMSetDisasmOptions(m_llvm_context,
LLVMDisassembler_Option_AsmPrinterVariant |
LLVMDisassembler_Option_PrintLatency);
@ -87,15 +89,47 @@ std::string HostDisassemblerLLVM::DisassembleHostBlock(const u8* code_start, con
if (!m_can_disasm)
return "(No LLVM context)";
u64 disasmPtr = (u64)code_start;
u8* disasmPtr = (u8*)code_start;
const u8 *end = code_start + code_size;
std::ostringstream x86_disasm;
while ((u8*)disasmPtr < end)
{
char inst_disasm[256];
disasmPtr += LLVMDisasmInstruction(m_llvm_context, (u8*)disasmPtr, (u64)(end - disasmPtr), (u64)disasmPtr, inst_disasm, 256);
size_t inst_size = LLVMDisasmInstruction(m_llvm_context, disasmPtr, (u64)(end - disasmPtr), (u64)disasmPtr, inst_disasm, 256);
if (!inst_size)
{
x86_disasm << "Invalid inst:";
if (m_instruction_size != -1)
{
// If we are on an architecture that has a fixed instruction size
// We can continue onward past this bad instruction.
std::string inst_str = "";
for (int i = 0; i < m_instruction_size; ++i)
inst_str += StringFromFormat("%02x", disasmPtr[i]);
x86_disasm << inst_str << std::endl;
disasmPtr += m_instruction_size;
}
else
{
// We can't continue if we are on an architecture that has flexible instruction sizes
// Dump the rest of the block instead
std::string code_block = "";
for (int i = 0; (disasmPtr + i) < end; ++i)
code_block += StringFromFormat("%02x", disasmPtr[i]);
x86_disasm << code_block << std::endl;
break;
}
}
else
{
x86_disasm << inst_disasm << std::endl;
disasmPtr += inst_size;
}
(*host_instructions_count)++;
}
@ -199,9 +233,9 @@ CJitWindow::CJitWindow(wxWindow* parent, wxWindowID id, const wxPoint& pos,
#elif defined(_M_X86)
m_disassembler.reset(new HostDisassemblerX86());
#elif defined(_M_ARM_64) && defined(HAS_LLVM)
m_disassembler.reset(new HostDisassemblerLLVM("aarch64-none-unknown"));
m_disassembler.reset(new HostDisassemblerLLVM("aarch64-none-unknown", 4, "cortex-a57"));
#elif defined(_M_ARM_32) && defined(HAS_LLVM)
m_disassembler.reset(new HostDisassemblerLLVM("armv7-none-unknown"));
m_disassembler.reset(new HostDisassemblerLLVM("armv7-none-unknown", 4, "cortex-a15"));
#else
m_disassembler.reset(new HostDisassembler());
#endif