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Add getFrameIndexReference() to TargetRegisterInfo, which allows targets to

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tell debug info which base register to use to reference a frame index on a
per-index basis. This is useful, for example, in the presence of dynamic
stack realignment when local variables are indexed via the stack pointer and
stack-based arguments via the frame pointer.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@89620 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jim Grosbach 2009-11-22 20:14:00 +00:00
parent a37aa54622
commit a2f20b20a8
2 changed files with 18 additions and 5 deletions
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12
include/llvm/Target/TargetRegisterInfo.h
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@ -698,6 +698,18 @@ public:
/// the stack frame of the specified index.
virtual int getFrameIndexOffset(MachineFunction &MF, int FI) const;
/// getFrameIndexReference - This method should return the base register
/// and offset used to reference a frame index location. The offset is
/// returned directly, and the base register is returned via FrameReg.
virtual int getFrameIndexReference(MachineFunction &MF, int FI,
unsigned &FrameReg) const {
// By default, assume all frame indices are referenced via whatever
// getFrameRegister() says. The target can override this if it's doing
// something different.
FrameReg = getFrameRegister(MF);
return getFrameIndexOffset(MF, FI);
}
/// getRARegister - This method should return the register where the return
/// address can be found.
virtual unsigned getRARegister() const = 0;

11
lib/CodeGen/AsmPrinter/DwarfDebug.cpp
View File

@ -1182,8 +1182,9 @@ DIE *DwarfDebug::createDbgScopeVariable(DbgVariable *DV, CompileUnit *Unit) {
// Variables for abstract instances of inlined functions don't get a
// location.
MachineLocation Location;
Location.set(RI->getFrameRegister(*MF),
RI->getFrameIndexOffset(*MF, DV->getFrameIndex()));
unsigned FrameReg;
int Offset = RI->getFrameIndexReference(*MF, DV->getFrameIndex(), FrameReg);
Location.set(FrameReg, Offset);
if (VD.hasComplexAddress())
@ -1465,9 +1466,9 @@ DIE *DwarfDebug::constructVariableDIE(DbgVariable *DV,
// Add variable address.
if (!Scope->isAbstractScope()) {
MachineLocation Location;
Location.set(RI->getFrameRegister(*MF),
RI->getFrameIndexOffset(*MF, DV->getFrameIndex()));
unsigned FrameReg;
int Offset = RI->getFrameIndexReference(*MF, DV->getFrameIndex(), FrameReg);
Location.set(FrameReg, Offset);
if (VD.hasComplexAddress())
addComplexAddress(DV, VariableDie, dwarf::DW_AT_location, Location);