// 分岐（jumpを含む）かどうか
bool IsBranch(int code)
{
return IsConditionalBranch(code) || IsUnconditionalBranch(code);
}
//*************************************************************************************
//
//*************************************************************************************
CTraceRecorder::EUpdateTraceStatus CTraceRecorder::UpdateTrace( u32 address,
bool branch_delay_slot,
bool branch_taken,
OpCode op_code,
CFragment * p_fragment )
{
DAEDALUS_ASSERT( mTracing, "We're not tracing" );
bool want_to_stop( p_fragment != NULL );
if( mTraceBuffer.size() > MAX_TRACE_LENGTH )
{
DBGConsole_Msg(0, "Hit max trace size!");
want_to_stop = true;
}
// Terminate if the current instruction is in the fragment cache or the trace reaches a specified size
if( want_to_stop && (mActiveBranchIdx == INVALID_IDX) )
{
DAEDALUS_ASSERT( mActiveBranchIdx == INVALID_IDX, "Exiting trace while in the middle of handling branch!" );
// Stop immediately so we can be sure of linking up with fragment
mTracing = false;
mExpectedExitTraceAddress = address;
return UTS_CREATE_FRAGMENT;
}
//
// Figure out whether to terminate this trace after adding this instruction
//
bool stop_trace_on_exit( false );
//
// We want to record the delay slot op for the active branch
//
if( mActiveBranchIdx != INVALID_IDX )
{
DAEDALUS_ASSERT( mActiveBranchIdx < mBranchDetails.size(), "Branch index is out of bounds" );
mBranchDetails[ mActiveBranchIdx ].DelaySlotTraceIndex = mTraceBuffer.size();
if (mBranchDetails[ mActiveBranchIdx ].SpeedHack == SHACK_POSSIBLE)
{
if (op_code._u32 == 0)
{
mBranchDetails[ mActiveBranchIdx ].SpeedHack = SHACK_SKIPTOEVENT;
}
#ifndef DAEDALUS_SILENT
else if (op_code.op == OP_ADDIU || op_code.op == OP_DADDI || op_code.op == OP_ADDI || op_code.op == OP_DADDIU)
{ // We don't handle COPYREG SPEEDHACKS
mBranchDetails[ mActiveBranchIdx ].SpeedHack = SHACK_COPYREG;
}
#endif
}
mActiveBranchIdx = INVALID_IDX;
}
// If we had to terminate on the last branch (e.g. for an indirect jump)
// or if we're jumping backwards, terminate the run when we exit
if( mStopTraceAfterDelaySlot && branch_delay_slot )
{
mStopTraceAfterDelaySlot = false;
stop_trace_on_exit = true;
}
//
// Update the expected trace exit address
// We assume that if we'll exit on the next instruction (assuming this isn't a branch)
//
if( !branch_delay_slot )
{
mExpectedExitTraceAddress = address + 4;
}
StaticAnalysis::RegisterUsage usage;
StaticAnalysis::Analyse(op_code,usage);
//
// If this is a branch, we need to determine if it was taken or not.
// We store a information about the 'off-trace' target.
// If the branch was taken, we need to flip the condition of the
// branch so that anything failing the test is directed off our trace
//
u32 branch_idx( INVALID_IDX );
ER4300BranchType branch_type( usage.BranchType );
if( branch_type != BT_NOT_BRANCH )
{
SBranchDetails details;
details.Likely = IsBranchTypeLikely( branch_type );
if( branch_type == BT_ERET )
{
stop_trace_on_exit = true;
details.Eret = true;
details.Direct = false;
details.TargetAddress = INDIRECT_EXIT_ADDRESS;
mExpectedExitTraceAddress = details.TargetAddress;
}
else if( !IsConditionalBranch( branch_type ) )
{
details.Direct = IsBranchTypeDirect( branch_type );
details.TargetAddress = gCPUState.TargetPC;
details.ConditionalBranchTaken = true;
mExpectedExitTraceAddress = details.TargetAddress;
if (!details.Direct || gCPUState.TargetPC <= gCPUState.CurrentPC)
{
// all indirect call will stop the trace
mStopTraceAfterDelaySlot = true;
}
if (details.Direct && gCPUState.TargetPC == gCPUState.CurrentPC)
{
details.SpeedHack = SHACK_POSSIBLE;
}
}
else
{
// Must be conditional, direct
DAEDALUS_ASSERT( IsBranchTypeDirect( branch_type ), "Not expecting an indirect branch here" );
if( branch_taken )
{
// XXXXXX should be able to get this some other way?
bool backwards( gCPUState.TargetPC <= gCPUState.CurrentPC );
if( backwards )
{
mStopTraceAfterDelaySlot = true;
}
if (gCPUState.TargetPC == gCPUState.CurrentPC)
{
details.SpeedHack = SHACK_POSSIBLE;
}
}
u32 branch_target_address( GetBranchTarget( address, op_code, branch_type ) );
u32 fallthrough_address( address + 8 );
u32 target_address;
if( branch_taken )
{
// We're following the branch.
target_address = fallthrough_address;
mExpectedExitTraceAddress = branch_target_address;
}
else
{
// We're not following the branch, and falling through.
target_address = branch_target_address;
mExpectedExitTraceAddress = fallthrough_address;
}
details.ConditionalBranchTaken = branch_taken;
details.Direct = true;
details.TargetAddress = target_address;
}
if( !details.Direct )
{
mNeedIndirectExitMap = true;
}
mActiveBranchIdx = mBranchDetails.size();
branch_idx = mBranchDetails.size();
mBranchDetails.push_back( details );
}
// Add this op to the trace buffer.
STraceEntry entry = { address, op_code, usage, branch_idx, branch_delay_slot };
mTraceBuffer.push_back( entry );
if( stop_trace_on_exit )
{
DAEDALUS_ASSERT( branch_type == BT_ERET || mActiveBranchIdx == INVALID_IDX, "Exiting trace while in the middle of handling branch!" );
mTracing = false;
return UTS_CREATE_FRAGMENT;
}
return UTS_CONTINUE_TRACE;
}