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Revise head-of-file comment.

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Eliminate some excess whitespace.
Fix bug in CallArgsDescriptor::get() handling call through a null pointer.

llvm-svn: 16012
This commit is contained in:
Brian Gaeke 2004-08-24 06:41:38 +00:00
parent 7bb492ce48
commit a4eb36282c
1 changed files with 28 additions and 31 deletions
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59
lib/Target/SparcV9/MachineCodeForInstruction.cpp
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@ -7,18 +7,12 @@
//
//===----------------------------------------------------------------------===//
//
// Representation of the sequence of machine instructions created for a single
// VM instruction. Additionally records information about hidden and implicit
// values used by the machine instructions: about hidden values used by the
// machine instructions:
//
// "Temporary values" are intermediate values used in the machine instruction
// sequence, but not in the VM instruction. Note that such values should be
// treated as pure SSA values with no interpretation of their operands (i.e., as
// a TmpInstruction object which actually represents such a value).
//
// (2) "Implicit uses" are values used in the VM instruction but not in the
// machine instruction sequence
// Container for the sequence of MachineInstrs created for a single
// LLVM Instruction. MachineCodeForInstruction also tracks temporary values
// (TmpInstruction objects) created during SparcV9 code generation, so that
// they can be deleted when they are no longer needed, and finally, it also
// holds some extra information for 'call' Instructions (using the
// CallArgsDescriptor object, which is also implemented in this file).
//
//===----------------------------------------------------------------------===//
@ -31,25 +25,24 @@
#include "MachineFunctionInfo.h"
#include "MachineInstrAnnot.h"
#include "SparcV9TmpInstr.h"
#include "SparcV9RegisterInfo.h"
using namespace llvm;
MachineCodeForInstruction &MachineCodeForInstruction::get(const Instruction *I){
MachineFunction &MF = MachineFunction::get(I->getParent()->getParent());
return MF.getInfo<SparcV9FunctionInfo>()->MCFIEntries[I];
}
void MachineCodeForInstruction::destroy(const Instruction *I) {
MachineFunction &MF = MachineFunction::get(I->getParent()->getParent());
MF.getInfo<SparcV9FunctionInfo>()->MCFIEntries.erase(I);
}
void
MachineCodeForInstruction::dropAllReferences()
{
void MachineCodeForInstruction::dropAllReferences() {
for (unsigned i=0, N=tempVec.size(); i < N; i++)
cast<Instruction>(tempVec[i])->dropAllReferences();
}
MachineCodeForInstruction::~MachineCodeForInstruction() {
// Let go of all uses in temp. instructions
dropAllReferences();
@ -65,7 +58,6 @@ MachineCodeForInstruction::~MachineCodeForInstruction() {
delete callArgsDesc;
}
CallArgsDescriptor::CallArgsDescriptor(CallInst* _callInstr,
TmpInstruction* _retAddrReg,
bool _isVarArgs, bool _noPrototype)
@ -91,21 +83,26 @@ CallInst *CallArgsDescriptor::getReturnValue() const {
return (callInstr->getType() == Type::VoidTy? NULL : callInstr);
}
// Mechanism to get the descriptor for a CALL MachineInstr.
// We get the LLVM CallInstr from the ret. addr. register argument
// of the CALL MachineInstr (which is explicit operand #3 for indirect
// calls or the last implicit operand for direct calls). We then get
// the CallArgsDescriptor from the MachineCodeForInstruction object for
// the CallInstr.
// This is roundabout but avoids adding a new map or annotation just
// to keep track of CallArgsDescriptors.
//
CallArgsDescriptor *CallArgsDescriptor::get(const MachineInstr* MI) {
const TmpInstruction* retAddrReg =
cast<TmpInstruction>(isa<Function>(MI->getOperand(0).getVRegValue())
? MI->getImplicitRef(MI->getNumImplicitRefs()-1)
: MI->getOperand(2).getVRegValue());
/// CallArgsDescriptor::get - Mechanism to get the descriptor for a CALL
/// MachineInstr. We get the LLVM CallInst from the return-address register
/// argument of the CALL MachineInstr (which is explicit operand #2 for
/// indirect calls or the last implicit operand for direct calls). We then get
/// the CallArgsDescriptor from the MachineCodeForInstruction object for the
/// CallInstr. This is roundabout but avoids adding a new map or annotation
/// just to keep track of CallArgsDescriptors.
///
CallArgsDescriptor *CallArgsDescriptor::get(const MachineInstr *MI) {
const Value *retAddrVal = 0;
if ((MI->getOperand (0).getType () == MachineOperand::MO_MachineRegister
&& MI->getOperand (0).getReg () == SparcV9::g0)
|| (MI->getOperand (0).getType () == MachineOperand::MO_VirtualRegister
&& !isa<Function> (MI->getOperand (0).getVRegValue ()))) {
retAddrVal = MI->getOperand (2).getVRegValue ();
} else {
retAddrVal = MI->getImplicitRef (MI->getNumImplicitRefs () - 1);
}
const TmpInstruction* retAddrReg = cast<TmpInstruction> (retAddrVal);
assert(retAddrReg->getNumOperands() == 1 &&
isa<CallInst>(retAddrReg->getOperand(0)) &&
"Location of callInstr arg for CALL instr. changed? FIX THIS CODE!");