-// $Id$
-//***************************************************************************
-// File:
-// Sparc.cpp
-//
-// Purpose:
-//
-// History:
-// 7/15/01 - Vikram Adve - Created
-//**************************************************************************/
-
+//===-- Sparc.cpp - General implementation file for the Sparc Target ------===//
+//
+// This file contains the code for the Sparc Target that does not fit in any of
+// the other files in this directory.
+//
+//===----------------------------------------------------------------------===//
#include "SparcInternals.h"
#include "llvm/Target/Sparc.h"
-#include "llvm/CodeGen/InstrScheduling.h"
-#include "llvm/CodeGen/InstrSelection.h"
-#include "llvm/CodeGen/MachineCodeForInstruction.h"
+#include "llvm/Function.h"
+#include "llvm/BasicBlock.h"
#include "llvm/CodeGen/MachineCodeForMethod.h"
-#include "llvm/CodeGen/RegisterAllocation.h"
-#include "llvm/CodeGen/MachineInstr.h"
-#include "llvm/Method.h"
-#include "llvm/PassManager.h"
#include <iostream>
using std::cerr;
// allocateSparcTargetMachine - Allocate and return a subclass of TargetMachine
// that implements the Sparc backend. (the llvm/CodeGen/Sparc.h interface)
//----------------------------------------------------------------------------
-//
TargetMachine *allocateSparcTargetMachine() { return new UltraSparc(); }
-//---------------------------------------------------------------------------
-// class InsertPrologEpilogCode
-//
-// Insert SAVE/RESTORE instructions for the method
-//
-// Insert prolog code at the unique method entry point.
-// Insert epilog code at each method exit point.
-// InsertPrologEpilog invokes these only if the method is not compiled
-// with the leaf method optimization.
-//
-//---------------------------------------------------------------------------
-static MachineInstr* minstrVec[MAX_INSTR_PER_VMINSTR];
-
-class InsertPrologEpilogCode : public MethodPass {
- TargetMachine &Target;
-public:
- inline InsertPrologEpilogCode(TargetMachine &T) : Target(T) {}
- bool runOnMethod(Method *M) {
- MachineCodeForMethod &mcodeInfo = MachineCodeForMethod::get(M);
- if (!mcodeInfo.isCompiledAsLeafMethod()) {
- InsertPrologCode(M);
- InsertEpilogCode(M);
- }
- return false;
- }
-
- void InsertPrologCode(Method *M);
- void InsertEpilogCode(Method *M);
-};
-
-void InsertPrologEpilogCode::InsertPrologCode(Method* method)
-{
- BasicBlock* entryBB = method->getEntryNode();
- unsigned N = GetInstructionsForProlog(entryBB, Target, minstrVec);
- assert(N <= MAX_INSTR_PER_VMINSTR);
- MachineCodeForBasicBlock& bbMvec = entryBB->getMachineInstrVec();
- bbMvec.insert(bbMvec.begin(), minstrVec, minstrVec+N);
-}
-
-
-void InsertPrologEpilogCode::InsertEpilogCode(Method* method)
-{
- for (Method::iterator I=method->begin(), E=method->end(); I != E; ++I)
- if ((*I)->getTerminator()->getOpcode() == Instruction::Ret)
- {
- BasicBlock* exitBB = *I;
- unsigned N = GetInstructionsForEpilog(exitBB, Target, minstrVec);
-
- MachineCodeForBasicBlock& bbMvec = exitBB->getMachineInstrVec();
- MachineCodeForInstruction &termMvec =
- MachineCodeForInstruction::get(exitBB->getTerminator());
-
- // Remove the NOPs in the delay slots of the return instruction
- const MachineInstrInfo &mii = Target.getInstrInfo();
- unsigned numNOPs = 0;
- while (termMvec.back()->getOpCode() == NOP)
- {
- assert( termMvec.back() == bbMvec.back());
- termMvec.pop_back();
- bbMvec.pop_back();
- ++numNOPs;
- }
- assert(termMvec.back() == bbMvec.back());
-
- // Check that we found the right number of NOPs and have the right
- // number of instructions to replace them.
- unsigned ndelays = mii.getNumDelaySlots(termMvec.back()->getOpCode());
- assert(numNOPs == ndelays && "Missing NOPs in delay slots?");
- assert(N == ndelays && "Cannot use epilog code for delay slots?");
-
- // Append the epilog code to the end of the basic block.
- bbMvec.push_back(minstrVec[0]);
- }
-}
-
//---------------------------------------------------------------------------
// class UltraSparcFrameInfo
UltraSparcFrameInfo::getRegSpillAreaOffset(MachineCodeForMethod& mcInfo,
bool& pos) const
{
+ mcInfo.freezeAutomaticVarsArea(); // ensure no more auto vars are added
+
pos = false; // static stack area grows downwards
unsigned int autoVarsSize = mcInfo.getAutomaticVarsSize();
- if (int mod = autoVarsSize % getStackFrameSizeAlignment())
- autoVarsSize += (getStackFrameSizeAlignment() - mod);
return StaticAreaOffsetFromFP - autoVarsSize;
}
UltraSparcFrameInfo::getTmpAreaOffset(MachineCodeForMethod& mcInfo,
bool& pos) const
{
+ mcInfo.freezeAutomaticVarsArea(); // ensure no more auto vars are added
+ mcInfo.freezeSpillsArea(); // ensure no more spill slots are added
+
pos = false; // static stack area grows downwards
unsigned int autoVarsSize = mcInfo.getAutomaticVarsSize();
unsigned int spillAreaSize = mcInfo.getRegSpillsSize();
int offset = autoVarsSize + spillAreaSize;
- if (int mod = offset % getStackFrameSizeAlignment())
- offset += (getStackFrameSizeAlignment() - mod);
return StaticAreaOffsetFromFP - offset;
}
UltraSparcFrameInfo::getDynamicAreaOffset(MachineCodeForMethod& mcInfo,
bool& pos) const
{
- // dynamic stack area grows downwards starting at top of opt-args area
+ // Dynamic stack area grows downwards starting at top of opt-args area.
+ // The opt-args, required-args, and register-save areas are empty except
+ // during calls and traps, so they are shifted downwards on each
+ // dynamic-size alloca.
+ pos = false;
unsigned int optArgsSize = mcInfo.getMaxOptionalArgsSize();
+ if (int extra = optArgsSize % getStackFrameSizeAlignment())
+ optArgsSize += (getStackFrameSizeAlignment() - extra);
int offset = optArgsSize + FirstOptionalOutgoingArgOffsetFromSP;
- assert(offset % getStackFrameSizeAlignment() == 0);
+ assert((offset - OFFSET) % getStackFrameSizeAlignment() == 0);
return offset;
}
schedInfo(*this),
regInfo(*this),
frameInfo(*this),
- cacheInfo(*this)
+ cacheInfo(*this),
+ optInfo(*this)
{
optSizeForSubWordData = 4;
minMemOpWordSize = 8;
maxAtomicMemOpWordSize = 8;
}
-
-
-//===---------------------------------------------------------------------===//
-// GenerateCodeForTarget Pass
-//
-// Native code generation for a specified target.
-//===---------------------------------------------------------------------===//
-
-class ConstructMachineCodeForMethod : public MethodPass {
- TargetMachine &Target;
-public:
- inline ConstructMachineCodeForMethod(TargetMachine &T) : Target(T) {}
- bool runOnMethod(Method *M) {
- MachineCodeForMethod::construct(M, Target);
- return false;
- }
-};
-
-class InstructionSelection : public MethodPass {
- TargetMachine &Target;
-public:
- inline InstructionSelection(TargetMachine &T) : Target(T) {}
- bool runOnMethod(Method *M) {
- if (SelectInstructionsForMethod(M, Target))
- cerr << "Instr selection failed for method " << M->getName() << "\n";
- return false;
- }
-};
-
-struct FreeMachineCodeForMethod : public MethodPass {
- static void freeMachineCode(Instruction *I) {
- MachineCodeForInstruction::destroy(I);
- }
-
- bool runOnMethod(Method *M) {
- for_each(M->inst_begin(), M->inst_end(), freeMachineCode);
- // Don't destruct MachineCodeForMethod - The global printer needs it
- //MachineCodeForMethod::destruct(M);
- return false;
- }
-};
-
-
-
-// addPassesToEmitAssembly - This method controls the entire code generation
-// process for the ultra sparc.
-//
-void UltraSparc::addPassesToEmitAssembly(PassManager &PM, std::ostream &Out) {
- // Construct and initialize the MachineCodeForMethod object for this method.
- PM.add(new ConstructMachineCodeForMethod(*this));
-
- PM.add(new InstructionSelection(*this));
-
- //PM.add(createInstructionSchedulingWithSSAPass(*this));
-
- PM.add(getRegisterAllocator(*this));
-
- //PM.add(new OptimizeLeafProcedures());
- //PM.add(new DeleteFallThroughBranches());
- //PM.add(new RemoveChainedBranches()); // should be folded with previous
- //PM.add(new RemoveRedundantOps()); // operations with %g0, NOP, etc.
-
- PM.add(new InsertPrologEpilogCode(*this));
-
- // Output assembly language to the .s file. Assembly emission is split into
- // two parts: Method output and Global value output. This is because method
- // output is pipelined with all of the rest of code generation stuff,
- // allowing machine code representations for methods to be free'd after the
- // method has been emitted.
- //
- PM.add(getMethodAsmPrinterPass(PM, Out));
- PM.add(new FreeMachineCodeForMethod()); // Free stuff no longer needed
-
- // Emit Module level assembly after all of the methods have been processed.
- PM.add(getModuleAsmPrinterPass(PM, Out));
-
- // Emit bytecode to the sparc assembly file into its special section next
- PM.add(getEmitBytecodeToAsmPass(Out));
-}
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