summaryrefslogtreecommitdiff
diff options
context:
space:
mode:
authorJim Grosbach <grosbach@apple.com>2009-11-22 20:14:00 +0000
committerJim Grosbach <grosbach@apple.com>2009-11-22 20:14:00 +0000
commita2f20b20a8dc7f053599840557405554a0848aec (patch)
treebfc706ed738609b2a1e005312cd04306d543cc39
parenta37aa546224ec03ba1f1a1598e0781af4b692673 (diff)
downloadllvm-a2f20b20a8dc7f053599840557405554a0848aec.tar.gz
llvm-a2f20b20a8dc7f053599840557405554a0848aec.tar.bz2
llvm-a2f20b20a8dc7f053599840557405554a0848aec.tar.xz
Add getFrameIndexReference() to TargetRegisterInfo, which allows targets to
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
-rw-r--r--include/llvm/Target/TargetRegisterInfo.h12
-rw-r--r--lib/CodeGen/AsmPrinter/DwarfDebug.cpp11
2 files changed, 18 insertions, 5 deletions
diff --git a/include/llvm/Target/TargetRegisterInfo.h b/include/llvm/Target/TargetRegisterInfo.h
index 07737590af..cb29c7306e 100644
--- a/include/llvm/Target/TargetRegisterInfo.h
+++ b/include/llvm/Target/TargetRegisterInfo.h
@@ -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;
diff --git a/lib/CodeGen/AsmPrinter/DwarfDebug.cpp b/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
index 8d4783be8d..1241c5ffeb 100644
--- a/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
+++ b/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
@@ -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);