mirror of
https://github.com/c64scene-ar/llvm-6502.git
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@148442 91177308-0d34-0410-b5e6-96231b3b80d8
547 lines
17 KiB
C++
547 lines
17 KiB
C++
//===-- llc.cpp - Implement the LLVM Native Code Generator ----------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This is the llc code generator driver. It provides a convenient
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// command-line interface for generating native assembly-language code
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// or C code, given LLVM bitcode.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/LLVMContext.h"
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#include "llvm/Module.h"
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#include "llvm/PassManager.h"
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#include "llvm/Pass.h"
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#include "llvm/ADT/Triple.h"
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#include "llvm/Support/IRReader.h"
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#include "llvm/CodeGen/LinkAllAsmWriterComponents.h"
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#include "llvm/CodeGen/LinkAllCodegenComponents.h"
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#include "llvm/MC/SubtargetFeature.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/FormattedStream.h"
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#include "llvm/Support/ManagedStatic.h"
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#include "llvm/Support/PluginLoader.h"
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#include "llvm/Support/PrettyStackTrace.h"
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#include "llvm/Support/ToolOutputFile.h"
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#include "llvm/Support/Host.h"
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#include "llvm/Support/Signals.h"
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#include "llvm/Support/TargetRegistry.h"
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#include "llvm/Support/TargetSelect.h"
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#include "llvm/Target/TargetData.h"
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#include "llvm/Target/TargetMachine.h"
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#include <memory>
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using namespace llvm;
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// General options for llc. Other pass-specific options are specified
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// within the corresponding llc passes, and target-specific options
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// and back-end code generation options are specified with the target machine.
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//
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static cl::opt<std::string>
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InputFilename(cl::Positional, cl::desc("<input bitcode>"), cl::init("-"));
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static cl::opt<std::string>
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OutputFilename("o", cl::desc("Output filename"), cl::value_desc("filename"));
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// Determine optimization level.
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static cl::opt<char>
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OptLevel("O",
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cl::desc("Optimization level. [-O0, -O1, -O2, or -O3] "
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"(default = '-O2')"),
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cl::Prefix,
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cl::ZeroOrMore,
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cl::init(' '));
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static cl::opt<std::string>
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TargetTriple("mtriple", cl::desc("Override target triple for module"));
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static cl::opt<std::string>
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MArch("march", cl::desc("Architecture to generate code for (see --version)"));
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static cl::opt<std::string>
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MCPU("mcpu",
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cl::desc("Target a specific cpu type (-mcpu=help for details)"),
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cl::value_desc("cpu-name"),
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cl::init(""));
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static cl::list<std::string>
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MAttrs("mattr",
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cl::CommaSeparated,
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cl::desc("Target specific attributes (-mattr=help for details)"),
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cl::value_desc("a1,+a2,-a3,..."));
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static cl::opt<Reloc::Model>
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RelocModel("relocation-model",
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cl::desc("Choose relocation model"),
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cl::init(Reloc::Default),
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cl::values(
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clEnumValN(Reloc::Default, "default",
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"Target default relocation model"),
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clEnumValN(Reloc::Static, "static",
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"Non-relocatable code"),
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clEnumValN(Reloc::PIC_, "pic",
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"Fully relocatable, position independent code"),
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clEnumValN(Reloc::DynamicNoPIC, "dynamic-no-pic",
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"Relocatable external references, non-relocatable code"),
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clEnumValEnd));
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static cl::opt<llvm::CodeModel::Model>
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CMModel("code-model",
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cl::desc("Choose code model"),
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cl::init(CodeModel::Default),
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cl::values(clEnumValN(CodeModel::Default, "default",
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"Target default code model"),
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clEnumValN(CodeModel::Small, "small",
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"Small code model"),
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clEnumValN(CodeModel::Kernel, "kernel",
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"Kernel code model"),
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clEnumValN(CodeModel::Medium, "medium",
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"Medium code model"),
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clEnumValN(CodeModel::Large, "large",
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"Large code model"),
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clEnumValEnd));
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static cl::opt<bool>
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RelaxAll("mc-relax-all",
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cl::desc("When used with filetype=obj, "
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"relax all fixups in the emitted object file"));
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cl::opt<TargetMachine::CodeGenFileType>
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FileType("filetype", cl::init(TargetMachine::CGFT_AssemblyFile),
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cl::desc("Choose a file type (not all types are supported by all targets):"),
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cl::values(
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clEnumValN(TargetMachine::CGFT_AssemblyFile, "asm",
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"Emit an assembly ('.s') file"),
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clEnumValN(TargetMachine::CGFT_ObjectFile, "obj",
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"Emit a native object ('.o') file [experimental]"),
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clEnumValN(TargetMachine::CGFT_Null, "null",
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"Emit nothing, for performance testing"),
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clEnumValEnd));
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cl::opt<bool> NoVerify("disable-verify", cl::Hidden,
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cl::desc("Do not verify input module"));
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cl::opt<bool> DisableDotLoc("disable-dot-loc", cl::Hidden,
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cl::desc("Do not use .loc entries"));
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cl::opt<bool> DisableCFI("disable-cfi", cl::Hidden,
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cl::desc("Do not use .cfi_* directives"));
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cl::opt<bool> EnableDwarfDirectory("enable-dwarf-directory", cl::Hidden,
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cl::desc("Use .file directives with an explicit directory."));
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static cl::opt<bool>
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DisableRedZone("disable-red-zone",
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cl::desc("Do not emit code that uses the red zone."),
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cl::init(false));
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static cl::opt<bool>
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EnableFPMAD("enable-fp-mad",
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cl::desc("Enable less precise MAD instructions to be generated"),
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cl::init(false));
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static cl::opt<bool>
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PrintCode("print-machineinstrs",
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cl::desc("Print generated machine code"),
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cl::init(false));
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static cl::opt<bool>
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DisableFPElim("disable-fp-elim",
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cl::desc("Disable frame pointer elimination optimization"),
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cl::init(false));
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static cl::opt<bool>
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DisableFPElimNonLeaf("disable-non-leaf-fp-elim",
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cl::desc("Disable frame pointer elimination optimization for non-leaf funcs"),
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cl::init(false));
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static cl::opt<bool>
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DisableExcessPrecision("disable-excess-fp-precision",
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cl::desc("Disable optimizations that may increase FP precision"),
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cl::init(false));
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static cl::opt<bool>
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EnableUnsafeFPMath("enable-unsafe-fp-math",
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cl::desc("Enable optimizations that may decrease FP precision"),
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cl::init(false));
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static cl::opt<bool>
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EnableNoInfsFPMath("enable-no-infs-fp-math",
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cl::desc("Enable FP math optimizations that assume no +-Infs"),
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cl::init(false));
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static cl::opt<bool>
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EnableNoNaNsFPMath("enable-no-nans-fp-math",
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cl::desc("Enable FP math optimizations that assume no NaNs"),
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cl::init(false));
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static cl::opt<bool>
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EnableHonorSignDependentRoundingFPMath("enable-sign-dependent-rounding-fp-math",
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cl::Hidden,
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cl::desc("Force codegen to assume rounding mode can change dynamically"),
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cl::init(false));
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static cl::opt<bool>
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GenerateSoftFloatCalls("soft-float",
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cl::desc("Generate software floating point library calls"),
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cl::init(false));
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static cl::opt<llvm::FloatABI::ABIType>
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FloatABIForCalls("float-abi",
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cl::desc("Choose float ABI type"),
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cl::init(FloatABI::Default),
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cl::values(
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clEnumValN(FloatABI::Default, "default",
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"Target default float ABI type"),
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clEnumValN(FloatABI::Soft, "soft",
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"Soft float ABI (implied by -soft-float)"),
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clEnumValN(FloatABI::Hard, "hard",
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"Hard float ABI (uses FP registers)"),
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clEnumValEnd));
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static cl::opt<bool>
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DontPlaceZerosInBSS("nozero-initialized-in-bss",
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cl::desc("Don't place zero-initialized symbols into bss section"),
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cl::init(false));
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static cl::opt<bool>
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EnableJITExceptionHandling("jit-enable-eh",
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cl::desc("Emit exception handling information"),
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cl::init(false));
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// In debug builds, make this default to true.
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#ifdef NDEBUG
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#define EMIT_DEBUG false
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#else
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#define EMIT_DEBUG true
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#endif
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static cl::opt<bool>
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EmitJitDebugInfo("jit-emit-debug",
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cl::desc("Emit debug information to debugger"),
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cl::init(EMIT_DEBUG));
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#undef EMIT_DEBUG
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static cl::opt<bool>
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EmitJitDebugInfoToDisk("jit-emit-debug-to-disk",
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cl::Hidden,
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cl::desc("Emit debug info objfiles to disk"),
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cl::init(false));
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static cl::opt<bool>
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EnableGuaranteedTailCallOpt("tailcallopt",
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cl::desc("Turn fastcc calls into tail calls by (potentially) changing ABI."),
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cl::init(false));
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static cl::opt<bool>
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DisableTailCalls("disable-tail-calls",
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cl::desc("Never emit tail calls"),
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cl::init(false));
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static cl::opt<unsigned>
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OverrideStackAlignment("stack-alignment",
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cl::desc("Override default stack alignment"),
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cl::init(0));
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static cl::opt<bool>
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EnableRealignStack("realign-stack",
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cl::desc("Realign stack if needed"),
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cl::init(true));
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static cl::opt<bool>
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DisableSwitchTables(cl::Hidden, "disable-jump-tables",
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cl::desc("Do not generate jump tables."),
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cl::init(false));
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static cl::opt<bool>
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EnableStrongPHIElim(cl::Hidden, "strong-phi-elim",
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cl::desc("Use strong PHI elimination."),
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cl::init(false));
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static cl::opt<std::string>
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TrapFuncName("trap-func", cl::Hidden,
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cl::desc("Emit a call to trap function rather than a trap instruction"),
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cl::init(""));
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static cl::opt<bool>
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SegmentedStacks("segmented-stacks",
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cl::desc("Use segmented stacks if possible."),
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cl::init(false));
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// GetFileNameRoot - Helper function to get the basename of a filename.
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static inline std::string
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GetFileNameRoot(const std::string &InputFilename) {
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std::string IFN = InputFilename;
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std::string outputFilename;
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int Len = IFN.length();
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if ((Len > 2) &&
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IFN[Len-3] == '.' &&
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((IFN[Len-2] == 'b' && IFN[Len-1] == 'c') ||
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(IFN[Len-2] == 'l' && IFN[Len-1] == 'l'))) {
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outputFilename = std::string(IFN.begin(), IFN.end()-3); // s/.bc/.s/
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} else {
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outputFilename = IFN;
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}
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return outputFilename;
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}
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static tool_output_file *GetOutputStream(const char *TargetName,
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Triple::OSType OS,
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const char *ProgName) {
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// If we don't yet have an output filename, make one.
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if (OutputFilename.empty()) {
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if (InputFilename == "-")
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OutputFilename = "-";
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else {
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OutputFilename = GetFileNameRoot(InputFilename);
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switch (FileType) {
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case TargetMachine::CGFT_AssemblyFile:
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if (TargetName[0] == 'c') {
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if (TargetName[1] == 0)
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OutputFilename += ".cbe.c";
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else if (TargetName[1] == 'p' && TargetName[2] == 'p')
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OutputFilename += ".cpp";
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else
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OutputFilename += ".s";
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} else
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OutputFilename += ".s";
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break;
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case TargetMachine::CGFT_ObjectFile:
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if (OS == Triple::Win32)
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OutputFilename += ".obj";
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else
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OutputFilename += ".o";
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break;
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case TargetMachine::CGFT_Null:
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OutputFilename += ".null";
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break;
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}
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}
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}
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// Decide if we need "binary" output.
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bool Binary = false;
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switch (FileType) {
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case TargetMachine::CGFT_AssemblyFile:
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break;
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case TargetMachine::CGFT_ObjectFile:
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case TargetMachine::CGFT_Null:
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Binary = true;
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break;
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}
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// Open the file.
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std::string error;
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unsigned OpenFlags = 0;
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if (Binary) OpenFlags |= raw_fd_ostream::F_Binary;
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tool_output_file *FDOut = new tool_output_file(OutputFilename.c_str(), error,
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OpenFlags);
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if (!error.empty()) {
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errs() << error << '\n';
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delete FDOut;
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return 0;
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}
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return FDOut;
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}
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// main - Entry point for the llc compiler.
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//
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int main(int argc, char **argv) {
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sys::PrintStackTraceOnErrorSignal();
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PrettyStackTraceProgram X(argc, argv);
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// Enable debug stream buffering.
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EnableDebugBuffering = true;
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LLVMContext &Context = getGlobalContext();
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llvm_shutdown_obj Y; // Call llvm_shutdown() on exit.
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// Initialize targets first, so that --version shows registered targets.
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InitializeAllTargets();
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InitializeAllTargetMCs();
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InitializeAllAsmPrinters();
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InitializeAllAsmParsers();
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// Register the target printer for --version.
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cl::AddExtraVersionPrinter(TargetRegistry::printRegisteredTargetsForVersion);
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cl::ParseCommandLineOptions(argc, argv, "llvm system compiler\n");
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// Load the module to be compiled...
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SMDiagnostic Err;
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std::auto_ptr<Module> M;
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M.reset(ParseIRFile(InputFilename, Err, Context));
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if (M.get() == 0) {
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Err.print(argv[0], errs());
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return 1;
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}
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Module &mod = *M.get();
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// If we are supposed to override the target triple, do so now.
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if (!TargetTriple.empty())
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mod.setTargetTriple(Triple::normalize(TargetTriple));
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Triple TheTriple(mod.getTargetTriple());
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if (TheTriple.getTriple().empty())
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TheTriple.setTriple(sys::getDefaultTargetTriple());
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// Allocate target machine. First, check whether the user has explicitly
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// specified an architecture to compile for. If so we have to look it up by
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// name, because it might be a backend that has no mapping to a target triple.
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const Target *TheTarget = 0;
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if (!MArch.empty()) {
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for (TargetRegistry::iterator it = TargetRegistry::begin(),
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ie = TargetRegistry::end(); it != ie; ++it) {
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if (MArch == it->getName()) {
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TheTarget = &*it;
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break;
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}
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}
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if (!TheTarget) {
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errs() << argv[0] << ": error: invalid target '" << MArch << "'.\n";
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return 1;
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}
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// Adjust the triple to match (if known), otherwise stick with the
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// module/host triple.
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Triple::ArchType Type = Triple::getArchTypeForLLVMName(MArch);
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if (Type != Triple::UnknownArch)
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TheTriple.setArch(Type);
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} else {
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std::string Err;
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TheTarget = TargetRegistry::lookupTarget(TheTriple.getTriple(), Err);
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if (TheTarget == 0) {
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errs() << argv[0] << ": error auto-selecting target for module '"
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<< Err << "'. Please use the -march option to explicitly "
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<< "pick a target.\n";
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return 1;
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}
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}
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// Package up features to be passed to target/subtarget
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std::string FeaturesStr;
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if (MAttrs.size()) {
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SubtargetFeatures Features;
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for (unsigned i = 0; i != MAttrs.size(); ++i)
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Features.AddFeature(MAttrs[i]);
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FeaturesStr = Features.getString();
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}
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CodeGenOpt::Level OLvl = CodeGenOpt::Default;
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switch (OptLevel) {
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default:
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errs() << argv[0] << ": invalid optimization level.\n";
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return 1;
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case ' ': break;
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case '0': OLvl = CodeGenOpt::None; break;
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case '1': OLvl = CodeGenOpt::Less; break;
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case '2': OLvl = CodeGenOpt::Default; break;
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case '3': OLvl = CodeGenOpt::Aggressive; break;
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}
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TargetOptions Options;
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Options.LessPreciseFPMADOption = EnableFPMAD;
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Options.PrintMachineCode = PrintCode;
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Options.NoFramePointerElim = DisableFPElim;
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Options.NoFramePointerElimNonLeaf = DisableFPElimNonLeaf;
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Options.NoExcessFPPrecision = DisableExcessPrecision;
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Options.UnsafeFPMath = EnableUnsafeFPMath;
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Options.NoInfsFPMath = EnableNoInfsFPMath;
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Options.NoNaNsFPMath = EnableNoNaNsFPMath;
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Options.HonorSignDependentRoundingFPMathOption =
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EnableHonorSignDependentRoundingFPMath;
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Options.UseSoftFloat = GenerateSoftFloatCalls;
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if (FloatABIForCalls != FloatABI::Default)
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Options.FloatABIType = FloatABIForCalls;
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Options.NoZerosInBSS = DontPlaceZerosInBSS;
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Options.JITExceptionHandling = EnableJITExceptionHandling;
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Options.JITEmitDebugInfo = EmitJitDebugInfo;
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Options.JITEmitDebugInfoToDisk = EmitJitDebugInfoToDisk;
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Options.GuaranteedTailCallOpt = EnableGuaranteedTailCallOpt;
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Options.DisableTailCalls = DisableTailCalls;
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Options.StackAlignmentOverride = OverrideStackAlignment;
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Options.RealignStack = EnableRealignStack;
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Options.DisableJumpTables = DisableSwitchTables;
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Options.TrapFuncName = TrapFuncName;
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Options.EnableSegmentedStacks = SegmentedStacks;
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std::auto_ptr<TargetMachine>
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target(TheTarget->createTargetMachine(TheTriple.getTriple(),
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MCPU, FeaturesStr, Options,
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RelocModel, CMModel, OLvl));
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assert(target.get() && "Could not allocate target machine!");
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TargetMachine &Target = *target.get();
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if (DisableDotLoc)
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Target.setMCUseLoc(false);
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if (DisableCFI)
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Target.setMCUseCFI(false);
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if (EnableDwarfDirectory)
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Target.setMCUseDwarfDirectory(true);
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if (GenerateSoftFloatCalls)
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FloatABIForCalls = FloatABI::Soft;
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// Disable .loc support for older OS X versions.
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if (TheTriple.isMacOSX() &&
|
|
TheTriple.isMacOSXVersionLT(10, 6))
|
|
Target.setMCUseLoc(false);
|
|
|
|
// Figure out where we are going to send the output...
|
|
OwningPtr<tool_output_file> Out
|
|
(GetOutputStream(TheTarget->getName(), TheTriple.getOS(), argv[0]));
|
|
if (!Out) return 1;
|
|
|
|
// Build up all of the passes that we want to do to the module.
|
|
PassManager PM;
|
|
|
|
// Add the target data from the target machine, if it exists, or the module.
|
|
if (const TargetData *TD = Target.getTargetData())
|
|
PM.add(new TargetData(*TD));
|
|
else
|
|
PM.add(new TargetData(&mod));
|
|
|
|
// Override default to generate verbose assembly.
|
|
Target.setAsmVerbosityDefault(true);
|
|
|
|
if (RelaxAll) {
|
|
if (FileType != TargetMachine::CGFT_ObjectFile)
|
|
errs() << argv[0]
|
|
<< ": warning: ignoring -mc-relax-all because filetype != obj";
|
|
else
|
|
Target.setMCRelaxAll(true);
|
|
}
|
|
|
|
{
|
|
formatted_raw_ostream FOS(Out->os());
|
|
|
|
// Ask the target to add backend passes as necessary.
|
|
if (Target.addPassesToEmitFile(PM, FOS, FileType, NoVerify)) {
|
|
errs() << argv[0] << ": target does not support generation of this"
|
|
<< " file type!\n";
|
|
return 1;
|
|
}
|
|
|
|
// Before executing passes, print the final values of the LLVM options.
|
|
cl::PrintOptionValues();
|
|
|
|
PM.run(mod);
|
|
}
|
|
|
|
// Declare success.
|
|
Out->keep();
|
|
|
|
return 0;
|
|
}
|