310 
 311 
 312 // For OopMaps, map a local variable or spill index to an VMReg.
 313 // This is the offset from sp() in the frame of the slot for the index,
 314 // skewed by SharedInfo::stack0 to indicate a stack location (vs.a register.)
 315 //
 316 //         C ABI size +
 317 //         framesize +     framesize +
 318 //         stack0          stack0         stack0          0 <- VMReg->value()
 319 //            |              |              | <registers> |
 320 //  ..........|..............|..............|.............|
 321 //    0 1 2 3 | <C ABI area> | 4 5 6 ...... |               <- local indices
 322 //    ^                        ^          sp()
 323 //    |                        |
 324 //  arguments            non-argument locals
 325 
 326 
 327 VMReg FrameMap::regname(LIR_Opr opr) const {
 328   if (opr->is_single_cpu()) {
 329     assert(!opr->is_virtual(), "should not see virtual registers here");
 330     return opr->as_register()->as_VMReg();
 331   } else if (opr->is_single_stack()) {
 332     return sp_offset2vmreg(sp_offset_for_slot(opr->single_stack_ix()));
 333   } else if (opr->is_address()) {
 334     LIR_Address* addr = opr->as_address_ptr();
 335     assert(addr->base() == stack_pointer(), "sp based addressing only");
 336     return sp_offset2vmreg(in_ByteSize(addr->index()->as_jint()));
 337   }
 338   ShouldNotReachHere();
 339   return VMRegImpl::Bad();
 340 }
 341 
 342 
 343 
 344 
 345 // ------------ extra spill slots ---------------

 310 
 311 
 312 // For OopMaps, map a local variable or spill index to an VMReg.
 313 // This is the offset from sp() in the frame of the slot for the index,
 314 // skewed by SharedInfo::stack0 to indicate a stack location (vs.a register.)
 315 //
 316 //         C ABI size +
 317 //         framesize +     framesize +
 318 //         stack0          stack0         stack0          0 <- VMReg->value()
 319 //            |              |              | <registers> |
 320 //  ..........|..............|..............|.............|
 321 //    0 1 2 3 | <C ABI area> | 4 5 6 ...... |               <- local indices
 322 //    ^                        ^          sp()
 323 //    |                        |
 324 //  arguments            non-argument locals
 325 
 326 
 327 VMReg FrameMap::regname(LIR_Opr opr) const {
 328   if (opr->is_single_cpu()) {
 329     assert(!opr->is_virtual(), "should not see virtual registers here");
 330     return opr->as_register().as_VMReg();
 331   } else if (opr->is_single_stack()) {
 332     return sp_offset2vmreg(sp_offset_for_slot(opr->single_stack_ix()));
 333   } else if (opr->is_address()) {
 334     LIR_Address* addr = opr->as_address_ptr();
 335     assert(addr->base() == stack_pointer(), "sp based addressing only");
 336     return sp_offset2vmreg(in_ByteSize(addr->index()->as_jint()));
 337   }
 338   ShouldNotReachHere();
 339   return VMRegImpl::Bad();
 340 }
 341 
 342 
 343 
 344 
 345 // ------------ extra spill slots ---------------