[llvm-commits] CVS: reopt/lib/LightWtProfiling/UnpackTraceFunction.cpp

[Brian Gaeke]

Changes in directory reopt/lib/LightWtProfiling:

UnpackTraceFunction.cpp updated: 1.114 -> 1.115
---
Log message:

Since I seem to be too woozy to write code tonight, here's a description
in English of how placeSpilledArgs ought to work.


---
Diffs of the changes:  (+22 -0)

Index: reopt/lib/LightWtProfiling/UnpackTraceFunction.cpp
diff -u reopt/lib/LightWtProfiling/UnpackTraceFunction.cpp:1.114 reopt/lib/LightWtProfiling/UnpackTraceFunction.cpp:1.115
--- reopt/lib/LightWtProfiling/UnpackTraceFunction.cpp:1.114	Fri Oct 15 00:03:04 2004
+++ reopt/lib/LightWtProfiling/UnpackTraceFunction.cpp	Fri Oct 15 00:25:59 2004
@@ -624,8 +624,30 @@
   BuildMI (&MBB, V9::NOP, 0);
 }
 
+/// placeSpilledArgs - Relocate excess TraceFn args, which were
+/// probably allocated to excess-incoming-arg stack slots, which are
+/// supposed to be allocated by the caller. Since we don't have a typical
+/// caller's stack frame, we need to relocate the excess args into our own
+/// stack frame.
 void UnpackTraceFunction::placeSpilledArgs () {
   SpilledArgMap.clear ();
+  for (unsigned a = 6, s = TF->TraceFn->asize(); a < s; ++a) {
+    // Get old position for argument #a using GetValueAllocState.  If it
+    // is not spilled in the TraceFn to an offset which is > 2047, then
+    // it isn't in an invalid region of the stack frame, and we don't
+    // have to relocate it.
+
+    // Find a new position for argument #a by using a similar formula to
+    // that of stackOffsetForReg(). For the formula's purposes, we can
+    // treat excess args as being "registers" numbered starting with
+    // SparcV9::fsr + 1.
+
+    // Use the new position (which is relative to sp) to calculate an
+    // offset from fp instead, by subtracting the TotalStackSize. The
+    // result should be > 0 and < 2047.
+
+    // Put the <old position, new position> pair into the SpilledArgMap.
+  }
   // FIXME - implement
 }