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-- Bug fix: use byte offsets not typed offsets in output assembly!

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-- Add support for ConstantExpr constants (only cast and add operators so far)
-- Avoid generating label Bbss.bss, which sometimes came out twice.

llvm-svn: 3578
This commit is contained in:
Vikram S. Adve 2002-09-05 18:28:10 +00:00
parent fa03431b04
commit e7aa2bf095
1 changed files with 24 additions and 19 deletions
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43
lib/Target/Sparc/EmitAssembly.cpp
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@ -107,7 +107,7 @@ public:
case Text: toAsm << "\".text\""; break;
case ReadOnlyData: toAsm << "\".rodata\",#alloc"; break;
case InitRWData: toAsm << "\".data\",#alloc,#write"; break;
case UninitRWData: toAsm << "\".bss\",#alloc,#write\nBbss.bss:"; break;
case UninitRWData: toAsm << "\".bss\",#alloc,#write"; break;
}
toAsm << "\n";
}
@ -186,30 +186,36 @@ public:
return "";
}
// ConstantExprToString() - Convert a ConstantExpr to a C expression, and
// return this as a string.
//
// ConstantExprToString() - Convert a ConstantExpr to an asm expression
// and return this as a string.
std::string ConstantExprToString(const ConstantExpr* CE,
const TargetMachine& target) {
std::string S;
switch(CE->getOpcode()) {
case Instruction::GetElementPtr:
{
{ // generate a symbolic expression for the byte address
const Value* ptrVal = CE->getOperand(0);
valToExprString(ptrVal, target, S);
std::vector<Value*> idxVec(CE->op_begin()+1, CE->op_end());
uint64_t byteOffset =
target.DataLayout.getIndexedOffset(ptrVal->getType(), idxVec);
const Type *PtrElTy =
cast<PointerType>(ptrVal->getType())->getElementType();
uint64_t eltSize = target.DataLayout.getTypeSize(PtrElTy);
S += " + " + utostr(byteOffset / eltSize);
S += "(" + valToExprString(ptrVal, target) + ") + ("
+ utostr(target.DataLayout.getIndexedOffset(ptrVal->getType(),idxVec))
+ ")";
break;
}
case Instruction::Cast:
// Support only non-converting casts for now, i.e., a no-op.
// This assertion is not a complete check.
assert(target.DataLayout.getTypeSize(CE->getType()) ==
target.DataLayout.getTypeSize(CE->getOperand(0)->getType()));
S += "(" + valToExprString(CE->getOperand(0), target) + ")";
break;
case Instruction::Add:
S += "(" + valToExprString(CE->getOperand(0), target) + ") + ("
+ valToExprString(CE->getOperand(1), target) + ")";
break;
default:
assert(0 && "Unsupported operator in ConstantExprToString()");
break;
@ -221,8 +227,8 @@ public:
// valToExprString - Helper function for ConstantExprToString().
// Appends result to argument string S.
//
void valToExprString(const Value* V, const TargetMachine& target,
std::string& S) {
std::string valToExprString(const Value* V, const TargetMachine& target) {
std::string S;
bool failed = false;
if (const Constant* CV = dyn_cast<Constant>(V)) { // symbolic or known
@ -237,7 +243,7 @@ public:
else if (isa<ConstantPointerNull>(CV))
S += "0";
else if (const ConstantPointerRef *CPR = dyn_cast<ConstantPointerRef>(CV))
valToExprString(CPR->getValue(), target, S);
S += valToExprString(CPR->getValue(), target);
else if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV))
S += ConstantExprToString(CE, target);
else
@ -253,6 +259,7 @@ public:
assert(0 && "Cannot convert value to string");
S += "<illegal-value>";
}
return S;
}
};
@ -860,8 +867,6 @@ void SparcModuleAsmPrinter::emitGlobalsAndConstants(const Module &M) {
for (Module::const_giterator GI = M.gbegin(), GE = M.gend(); GI != GE; ++GI) {
if (GI->hasInitializer() && GI->isConstant()) {
enterSection(AsmPrinter::ReadOnlyData); // read-only, initialized data
} else if (GI->hasInitializer() && !GI->isConstant()) { // read-write data
enterSection(AsmPrinter::ReadOnlyData); // read-only, initialized data
} else if (GI->hasInitializer() && !GI->isConstant()) { // read-write data
enterSection(AsmPrinter::InitRWData);
} else {