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Update the description of MachineFrameInfo's OffsetAdjustment. The value of

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this adjustment does not change the direction or the signs of the object
offsets, and the details of the offset calculations can be target-specific.
Also mention that for most targets this value is only used to generate debug
info.

llvm-svn: 82750
This commit is contained in:
Bob Wilson 2009-09-25 05:30:55 +00:00
parent b5922580d6
commit 841f543880
1 changed files with 8 additions and 5 deletions
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13
include/llvm/CodeGen/MachineFrameInfo.h
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@ -133,11 +133,14 @@ class MachineFrameInfo {
uint64_t StackSize;
/// OffsetAdjustment - The amount that a frame offset needs to be adjusted to
/// have the actual offset from the stack/frame pointer. The calculation is
/// MFI->getObjectOffset(Index) + StackSize - TFI.getOffsetOfLocalArea() +
/// OffsetAdjustment. If OffsetAdjustment is zero (default) then offsets are
/// away from TOS. If OffsetAdjustment == StackSize then offsets are toward
/// TOS.
/// have the actual offset from the stack/frame pointer. The exact usage of
/// this is target-dependent, but it is typically used to adjust between
/// SP-relative and FP-relative offsets. E.G., if objects are accessed via
/// SP then OffsetAdjustment is zero; if FP is used, OffsetAdjustment is set
/// to the distance between the initial SP and the value in FP. For many
/// targets, this value is only used when generating debug info (via
/// TargetRegisterInfo::getFrameIndexOffset); when generating code, the
/// corresponding adjustments are performed directly.
int OffsetAdjustment;
/// MaxAlignment - The prolog/epilog code inserter may process objects