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Add support to print 4-, 8-, and 16- byte constant literals in special

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sections. e.g. On Darwin that would be .literal4 and .literal8.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28977 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng
2006-06-29 00:26:09 +00:00
parent 2c79de8018
commit 2d2cec1e9e
2 changed files with 59 additions and 11 deletions
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58
lib/CodeGen/AsmPrinter.cpp
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@@ -55,6 +55,9 @@ AsmPrinter::AsmPrinter(std::ostream &o, TargetMachine &tm)
JumpTableSection("\t.section .rodata\n"),
StaticCtorsSection("\t.section .ctors,\"aw\",@progbits"),
StaticDtorsSection("\t.section .dtors,\"aw\",@progbits"),
FourByteConstantSection(0),
EightByteConstantSection(0),
SixteenByteConstantSection(0),
LCOMMDirective(0),
COMMDirective("\t.comm\t"),
COMMDirectiveTakesAlignment(true),
@@ -147,19 +150,54 @@ void AsmPrinter::SetupMachineFunction(MachineFunction &MF) {
void AsmPrinter::EmitConstantPool(MachineConstantPool *MCP) {
const std::vector<MachineConstantPoolEntry> &CP = MCP->getConstants();
if (CP.empty()) return;
SwitchToDataSection(ConstantPoolSection, 0);
EmitAlignment(MCP->getConstantPoolAlignment());
// Some targets require 4-, 8-, and 16- byte constant literals to be placed
// in special sections.
std::vector<std::pair<MachineConstantPoolEntry,unsigned> > FourByteCPs;
std::vector<std::pair<MachineConstantPoolEntry,unsigned> > EightByteCPs;
std::vector<std::pair<MachineConstantPoolEntry,unsigned> > SixteenByteCPs;
std::vector<std::pair<MachineConstantPoolEntry,unsigned> > OtherCPs;
for (unsigned i = 0, e = CP.size(); i != e; ++i) {
O << PrivateGlobalPrefix << "CPI" << getFunctionNumber() << '_' << i
<< ":\t\t\t\t\t" << CommentString << " ";
WriteTypeSymbolic(O, CP[i].Val->getType(), 0) << '\n';
EmitGlobalConstant(CP[i].Val);
MachineConstantPoolEntry CPE = CP[i];
const Constant *CV = CPE.Val;
const Type *Ty = CV->getType();
if (FourByteConstantSection &&
TM.getTargetData()->getTypeSize(Ty) == 4)
FourByteCPs.push_back(std::make_pair(CPE, i));
else if (EightByteConstantSection &&
TM.getTargetData()->getTypeSize(Ty) == 8)
EightByteCPs.push_back(std::make_pair(CPE, i));
else if (SixteenByteConstantSection &&
TM.getTargetData()->getTypeSize(Ty) == 16)
SixteenByteCPs.push_back(std::make_pair(CPE, i));
else
OtherCPs.push_back(std::make_pair(CPE, i));
}
unsigned Alignment = MCP->getConstantPoolAlignment();
EmitConstantPool(Alignment, FourByteConstantSection, FourByteCPs);
EmitConstantPool(Alignment, EightByteConstantSection, EightByteCPs);
EmitConstantPool(Alignment, SixteenByteConstantSection, SixteenByteCPs);
EmitConstantPool(Alignment, ConstantPoolSection, OtherCPs);
}
void AsmPrinter::EmitConstantPool(unsigned Alignment, const char *Section,
std::vector<std::pair<MachineConstantPoolEntry,unsigned> > &CP) {
if (CP.empty()) return;
SwitchToDataSection(Section, 0);
EmitAlignment(Alignment);
for (unsigned i = 0, e = CP.size(); i != e; ++i) {
O << PrivateGlobalPrefix << "CPI" << getFunctionNumber() << '_'
<< CP[i].second << ":\t\t\t\t\t" << CommentString << " ";
WriteTypeSymbolic(O, CP[i].first.Val->getType(), 0) << '\n';
EmitGlobalConstant(CP[i].first.Val);
if (i != e-1) {
unsigned EntSize = TM.getTargetData()->getTypeSize(CP[i].Val->getType());
unsigned ValEnd = CP[i].Offset + EntSize;
unsigned EntSize =
TM.getTargetData()->getTypeSize(CP[i].first.Val->getType());
unsigned ValEnd = CP[i].first.Offset + EntSize;
// Emit inter-object padding for alignment.
EmitZeros(CP[i+1].Offset-ValEnd);
EmitZeros(CP[i+1].first.Offset-ValEnd);
}
}
}