llvm-6502/lib/CodeGen/LLVMTargetMachine.cpp
Bill Wendling 80a320d974 Update in response to feedback from Chris:
- Use enums instead of magic numbers.

- Rework algorithm to use the bytes size from the target to determine when to
  emit stack protectors.

- Get rid of "propolice" in any comments.

- Renamed an option to its expanded form.

- Other miscellanenous changes.

More changes will come after this.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@58723 91177308-0d34-0410-b5e6-96231b3b80d8
2008-11-04 21:53:09 +00:00

260 lines
8.7 KiB
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//===-- LLVMTargetMachine.cpp - Implement the LLVMTargetMachine class -----===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements the LLVMTargetMachine class.
//
//===----------------------------------------------------------------------===//
#include "llvm/Target/TargetMachine.h"
#include "llvm/PassManager.h"
#include "llvm/Pass.h"
#include "llvm/Assembly/PrintModulePass.h"
#include "llvm/Analysis/LoopPass.h"
#include "llvm/CodeGen/Passes.h"
#include "llvm/CodeGen/GCStrategy.h"
#include "llvm/Target/TargetOptions.h"
#include "llvm/Target/TargetAsmInfo.h"
#include "llvm/Transforms/Scalar.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/raw_ostream.h"
using namespace llvm;
namespace llvm {
bool EnableFastISel;
}
static cl::opt<bool> PrintLSR("print-lsr-output", cl::Hidden,
cl::desc("Print LLVM IR produced by the loop-reduce pass"));
static cl::opt<bool> PrintISelInput("print-isel-input", cl::Hidden,
cl::desc("Print LLVM IR input to isel pass"));
static cl::opt<bool> PrintEmittedAsm("print-emitted-asm", cl::Hidden,
cl::desc("Dump emitter generated instructions as assembly"));
static cl::opt<bool> PrintGCInfo("print-gc", cl::Hidden,
cl::desc("Dump garbage collector data"));
// Hidden options to help debugging
static cl::opt<bool>
EnableSinking("enable-sinking", cl::init(false), cl::Hidden,
cl::desc("Perform sinking on machine code"));
static cl::opt<bool>
EnableLICM("machine-licm",
cl::init(false), cl::Hidden,
cl::desc("Perform loop-invariant code motion on machine code"));
// When this works it will be on by default.
static cl::opt<bool>
DisablePostRAScheduler("disable-post-RA-scheduler",
cl::desc("Disable scheduling after register allocation"),
cl::init(true));
// Enable or disable FastISel. Both options are needed, because
// FastISel is enabled by default with -fast, and we wish to be
// able to enable or disable fast-isel independently from -fast.
static cl::opt<cl::boolOrDefault>
EnableFastISelOption("fast-isel", cl::Hidden,
cl::desc("Enable the experimental \"fast\" instruction selector"));
// Enable stack protectors.
static cl::opt<SSP::StackProtectorLevel>
EnableStackProtector("enable-stack-protector",
cl::desc("Stack canary protection level: (default: off)"),
cl::init(SSP::OFF),
cl::values(clEnumValN(SSP::ALL, "all",
"All functions get stack protectors."),
clEnumValN(SSP::SOME, "some",
"Only functions requiring stack protectors get them."),
clEnumValN(SSP::OFF, "off",
"No functions get stack protectors."),
clEnumValEnd));
FileModel::Model
LLVMTargetMachine::addPassesToEmitFile(PassManagerBase &PM,
raw_ostream &Out,
CodeGenFileType FileType,
bool Fast) {
// Add common CodeGen passes.
if (addCommonCodeGenPasses(PM, Fast))
return FileModel::Error;
// Fold redundant debug labels.
PM.add(createDebugLabelFoldingPass());
if (PrintMachineCode)
PM.add(createMachineFunctionPrinterPass(cerr));
if (addPreEmitPass(PM, Fast) && PrintMachineCode)
PM.add(createMachineFunctionPrinterPass(cerr));
if (!Fast)
PM.add(createLoopAlignerPass());
switch (FileType) {
default:
break;
case TargetMachine::AssemblyFile:
if (addAssemblyEmitter(PM, Fast, Out))
return FileModel::Error;
return FileModel::AsmFile;
case TargetMachine::ObjectFile:
if (getMachOWriterInfo())
return FileModel::MachOFile;
else if (getELFWriterInfo())
return FileModel::ElfFile;
}
return FileModel::Error;
}
/// addPassesToEmitFileFinish - If the passes to emit the specified file had to
/// be split up (e.g., to add an object writer pass), this method can be used to
/// finish up adding passes to emit the file, if necessary.
bool LLVMTargetMachine::addPassesToEmitFileFinish(PassManagerBase &PM,
MachineCodeEmitter *MCE,
bool Fast) {
if (MCE)
addSimpleCodeEmitter(PM, Fast, PrintEmittedAsm, *MCE);
PM.add(createGCInfoDeleter());
// Delete machine code for this function
PM.add(createMachineCodeDeleter());
return false; // success!
}
/// addPassesToEmitMachineCode - Add passes to the specified pass manager to
/// get machine code emitted. This uses a MachineCodeEmitter object to handle
/// actually outputting the machine code and resolving things like the address
/// of functions. This method should returns true if machine code emission is
/// not supported.
///
bool LLVMTargetMachine::addPassesToEmitMachineCode(PassManagerBase &PM,
MachineCodeEmitter &MCE,
bool Fast) {
// Add common CodeGen passes.
if (addCommonCodeGenPasses(PM, Fast))
return true;
if (addPreEmitPass(PM, Fast) && PrintMachineCode)
PM.add(createMachineFunctionPrinterPass(cerr));
addCodeEmitter(PM, Fast, PrintEmittedAsm, MCE);
PM.add(createGCInfoDeleter());
// Delete machine code for this function
PM.add(createMachineCodeDeleter());
return false; // success!
}
/// addCommonCodeGenPasses - Add standard LLVM codegen passes used for
/// both emitting to assembly files or machine code output.
///
bool LLVMTargetMachine::addCommonCodeGenPasses(PassManagerBase &PM, bool Fast) {
// Standard LLVM-Level Passes.
// Run loop strength reduction before anything else.
if (!Fast) {
PM.add(createLoopStrengthReducePass(getTargetLowering()));
if (PrintLSR)
PM.add(createPrintFunctionPass("\n\n*** Code after LSR ***\n", &errs()));
}
PM.add(createGCLoweringPass());
if (!getTargetAsmInfo()->doesSupportExceptionHandling())
PM.add(createLowerInvokePass(getTargetLowering()));
// Make sure that no unreachable blocks are instruction selected.
PM.add(createUnreachableBlockEliminationPass());
if (!Fast)
PM.add(createCodeGenPreparePass(getTargetLowering()));
if (EnableStackProtector != SSP::OFF)
PM.add(createStackProtectorPass(EnableStackProtector, getTargetLowering()));
if (PrintISelInput)
PM.add(createPrintFunctionPass("\n\n"
"*** Final LLVM Code input to ISel ***\n",
&errs()));
// Standard Lower-Level Passes.
// Enable FastISel with -fast, but allow that to be overridden.
if (EnableFastISelOption == cl::BOU_TRUE ||
(Fast && EnableFastISelOption != cl::BOU_FALSE))
EnableFastISel = true;
// Ask the target for an isel.
if (addInstSelector(PM, Fast))
return true;
// Print the instruction selected machine code...
if (PrintMachineCode)
PM.add(createMachineFunctionPrinterPass(cerr));
if (EnableLICM)
PM.add(createMachineLICMPass());
if (EnableSinking)
PM.add(createMachineSinkingPass());
// Run pre-ra passes.
if (addPreRegAlloc(PM, Fast) && PrintMachineCode)
PM.add(createMachineFunctionPrinterPass(cerr));
// Perform register allocation.
PM.add(createRegisterAllocator());
// Perform stack slot coloring.
if (!Fast)
PM.add(createStackSlotColoringPass());
if (PrintMachineCode) // Print the register-allocated code
PM.add(createMachineFunctionPrinterPass(cerr));
// Run post-ra passes.
if (addPostRegAlloc(PM, Fast) && PrintMachineCode)
PM.add(createMachineFunctionPrinterPass(cerr));
if (PrintMachineCode)
PM.add(createMachineFunctionPrinterPass(cerr));
PM.add(createLowerSubregsPass());
if (PrintMachineCode) // Print the subreg lowered code
PM.add(createMachineFunctionPrinterPass(cerr));
// Insert prolog/epilog code. Eliminate abstract frame index references...
PM.add(createPrologEpilogCodeInserter());
if (PrintMachineCode)
PM.add(createMachineFunctionPrinterPass(cerr));
// Second pass scheduler.
if (!Fast && !DisablePostRAScheduler)
PM.add(createPostRAScheduler());
// Branch folding must be run after regalloc and prolog/epilog insertion.
if (!Fast)
PM.add(createBranchFoldingPass(getEnableTailMergeDefault()));
PM.add(createGCMachineCodeAnalysisPass());
if (PrintMachineCode)
PM.add(createMachineFunctionPrinterPass(cerr));
if (PrintGCInfo)
PM.add(createGCInfoPrinter(*cerr));
return false;
}