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Fix handling of functions with internal linkage.

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llvm-svn: 129099
This commit is contained in:
Akira Hatanaka 2011-04-07 19:51:44 +00:00
parent 5d23dd2116
commit 24e15bbe94
2 changed files with 79 additions and 8 deletions
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35
lib/Target/Mips/MipsISelLowering.cpp
View File

@ -784,7 +784,8 @@ SDValue MipsTargetLowering::LowerGlobalAddress(SDValue Op,
false, false, 0);
// On functions and global targets not internal linked only
// a load from got/GP is necessary for PIC to work.
if (!GV->hasLocalLinkage() || isa<Function>(GV))
if (!GV->hasInternalLinkage() &&
(!GV->hasLocalLinkage() || isa<Function>(GV)))
return ResNode;
SDValue GALo = DAG.getTargetGlobalAddress(GV, dl, MVT::i32, 0,
MipsII::MO_ABS_LO);
@ -1202,10 +1203,19 @@ MipsTargetLowering::LowerCall(SDValue Chain, SDValue Callee,
// node so that legalize doesn't hack it.
unsigned char OpFlag = IsPIC ? MipsII::MO_GOT_CALL : MipsII::MO_NO_FLAG;
bool LoadSymAddr = false;
SDValue CalleeLo;
if (GlobalAddressSDNode *G = dyn_cast<GlobalAddressSDNode>(Callee)) {
Callee = DAG.getTargetGlobalAddress(G->getGlobal(), dl,
getPointerTy(), 0, OpFlag);
if (IsPIC && G->getGlobal()->hasInternalLinkage()) {
Callee = DAG.getTargetGlobalAddress(G->getGlobal(), dl,
getPointerTy(), 0,MipsII:: MO_GOT);
CalleeLo = DAG.getTargetGlobalAddress(G->getGlobal(), dl, getPointerTy(),
0, MipsII::MO_ABS_LO);
} else {
Callee = DAG.getTargetGlobalAddress(G->getGlobal(), dl,
getPointerTy(), 0, OpFlag);
}
LoadSymAddr = true;
}
else if (ExternalSymbolSDNode *S = dyn_cast<ExternalSymbolSDNode>(Callee)) {
@ -1217,11 +1227,20 @@ MipsTargetLowering::LowerCall(SDValue Chain, SDValue Callee,
// Create nodes that load address of callee and copy it to T9
if (IsPIC) {
if (LoadSymAddr) {
// load callee address
Callee = DAG.getLoad(MVT::i32, dl, Chain, Callee,
MachinePointerInfo::getGOT(),
false, false, 0);
Chain = Callee.getValue(1);
// Load callee address
SDValue LoadValue = DAG.getLoad(MVT::i32, dl, Chain, Callee,
MachinePointerInfo::getGOT(),
false, false, 0);
// Use GOT+LO if callee has internal linkage.
if (CalleeLo.getNode()) {
SDValue Lo = DAG.getNode(MipsISD::Lo, dl, MVT::i32, CalleeLo);
Callee = DAG.getNode(ISD::ADD, dl, MVT::i32, LoadValue, Lo);
} else
Callee = LoadValue;
// Use chain output from LoadValue
Chain = LoadValue.getValue(1);
}
// copy to T9

52
test/CodeGen/Mips/internalfunc.ll Normal file
View File

@ -0,0 +1,52 @@
; RUN: llc < %s -march=mips | FileCheck %s
@caller.sf1 = internal unnamed_addr global void (...)* null, align 4
@gf1 = external global void (...)*
@.str = private unnamed_addr constant [3 x i8] c"f2\00"
define i32 @main(i32 %argc, i8** nocapture %argv) nounwind {
entry:
; CHECK: lw $[[R0:[0-9]+]], %got(f2)($gp)
; CHECK: addiu $25, $[[R0]], %lo(f2)
tail call fastcc void @f2()
ret i32 0
}
define void @caller(i32 %a0, i32 %a1) nounwind {
entry:
; CHECK: lw $[[R1:[0-9]+]], %got(caller.sf1)($gp)
; CHECK: addiu ${{[0-9]+}}, $[[R1]], %lo(caller.sf1)
%tobool = icmp eq i32 %a1, 0
br i1 %tobool, label %if.end, label %if.then
if.then: ; preds = %entry
%tmp1 = load void (...)** @caller.sf1, align 4
tail call void (...)* %tmp1() nounwind
br label %if.end
if.end: ; preds = %entry, %if.then
; CHECK: lw $[[R2:[0-9]+]], %got(sf2)($gp)
; CHECK: lw $[[R3:[0-9]+]], %got(caller.sf1)($gp)
; CHECK: addiu ${{[0-9]+}}, $[[R2]], %lo(sf2)
; CHECK: addiu ${{[0-9]+}}, $[[R3]], %lo(caller.sf1)
%tobool3 = icmp ne i32 %a0, 0
%tmp4 = load void (...)** @gf1, align 4
%cond = select i1 %tobool3, void (...)* %tmp4, void (...)* bitcast (void ()* @sf2 to void (...)*)
store void (...)* %cond, void (...)** @caller.sf1, align 4
ret void
}
define internal void @sf2() nounwind {
entry:
%call = tail call i32 (i8*, ...)* @printf(i8* getelementptr inbounds ([3 x i8]* @.str, i32 0, i32 0)) nounwind
ret void
}
declare i32 @printf(i8* nocapture, ...) nounwind
define internal fastcc void @f2() nounwind noinline {
entry:
%call = tail call i32 (i8*, ...)* @printf(i8* getelementptr inbounds ([3 x i8]* @.str, i32 0, i32 0)) nounwind
ret void
}