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This reapplies r207130 with an additional testcase+and a missing check for

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AllocaInst that was missing in one location.
Debug info for optimized code: Support variables that are on the stack and
described by DBG_VALUEs during their lifetime.

Previously, when a variable was at a FrameIndex for any part of its
lifetime, this would shadow all other DBG_VALUEs and only a single
fbreg location would be emitted, which in fact is only valid for a small
range and not the entire lexical scope of the variable. The included
dbg-value-const-byref testcase demonstrates this.

This patch fixes this by
Local
- emitting dbg.value intrinsics for allocas that are passed by reference
- dropping all dbg.declares (they are now fully lowered to dbg.values)
SelectionDAG
- renamed constructors for SDDbgValue for better readability.
- fix UserValue::match() to handle indirect values correctly
- not inserting an MMI table entries for dbg.values that describe allocas.
- lowering dbg.values that describe allocas into *indirect* DBG_VALUEs.
CodeGenPrepare
- leaving dbg.values for an alloca were they are (see comment)
Other
- regenerated/updated instcombine.ll testcase and included source

rdar://problem/16679879
http://reviews.llvm.org/D3374

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@207165 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Adrian Prantl
2014-04-25 00:38:40 +00:00
parent ab6ab3c333
commit 50e7ba14ca
12 changed files with 254 additions and 140 deletions
Download Patch File Download Diff File Expand all files Collapse all files
lib/CodeGen/SelectionDAG/SelectionDAG.cpp
+12 -6
View File
@@ -5646,21 +5646,26 @@ SDNode *SelectionDAG::getNodeIfExists(unsigned Opcode, SDVTList VTList,
/// getDbgValue - Creates a SDDbgValue node.
///
/// SDNode
SDDbgValue *
SelectionDAG::getDbgValue(MDNode *MDPtr, SDNode *N, unsigned R, uint64_t Off,
SelectionDAG::getDbgValue(MDNode *MDPtr, SDNode *N, unsigned R,
bool IsIndirect, uint64_t Off,
DebugLoc DL, unsigned O) {
return new (Allocator) SDDbgValue(MDPtr, N, R, Off, DL, O);
return new (Allocator) SDDbgValue(MDPtr, N, R, IsIndirect, Off, DL, O);
}
/// Constant
SDDbgValue *
SelectionDAG::getDbgValue(MDNode *MDPtr, const Value *C, uint64_t Off,
DebugLoc DL, unsigned O) {
SelectionDAG::getConstantDbgValue(MDNode *MDPtr, const Value *C,
uint64_t Off,
DebugLoc DL, unsigned O) {
return new (Allocator) SDDbgValue(MDPtr, C, Off, DL, O);
}
/// FrameIndex
SDDbgValue *
SelectionDAG::getDbgValue(MDNode *MDPtr, unsigned FI, uint64_t Off,
DebugLoc DL, unsigned O) {
SelectionDAG::getFrameIndexDbgValue(MDNode *MDPtr, unsigned FI, uint64_t Off,
DebugLoc DL, unsigned O) {
return new (Allocator) SDDbgValue(MDPtr, FI, Off, DL, O);
}
@@ -6066,6 +6071,7 @@ void SelectionDAG::TransferDbgValues(SDValue From, SDValue To) {
SDDbgValue *Dbg = *I;
if (Dbg->getKind() == SDDbgValue::SDNODE) {
SDDbgValue *Clone = getDbgValue(Dbg->getMDPtr(), ToNode, To.getResNo(),
Dbg->isIndirect(),
Dbg->getOffset(), Dbg->getDebugLoc(),
Dbg->getOrder());
ClonedDVs.push_back(Clone);