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https://github.com/c64scene-ar/llvm-6502.git
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63dea2c952
This commit adds a new pass that can inject checks before indirect calls to make sure that these calls target known locations. It supports three types of checks and, at compile time, it can take the name of a custom function to call when an indirect call check fails. The default failure function ignores the error and continues. This pass incidentally moves the function JumpInstrTables::transformType from private to public and makes it static (with a new argument that specifies the table type to use); this is so that the CFI code can transform function types at call sites to determine which jump-instruction table to use for the check at that site. Also, this removes support for jumptables in ARM, pending further performance analysis and discussion. Review: http://reviews.llvm.org/D4167 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@221708 91177308-0d34-0410-b5e6-96231b3b80d8
301 lines
12 KiB
C++
301 lines
12 KiB
C++
//===-- CommandFlags.h - Command Line Flags Interface -----------*- C++ -*-===//
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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 file contains codegen-specific flags that are shared between different
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// command line tools. The tools "llc" and "opt" both use this file to prevent
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// flag duplication.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_CODEGEN_COMMANDFLAGS_H
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#define LLVM_CODEGEN_COMMANDFLAGS_H
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#include "llvm/MC/MCTargetOptionsCommandFlags.h"
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#include "llvm/Support/CodeGen.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Target/TargetMachine.h"
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#include "llvm/Target/TargetOptions.h"
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#include <string>
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using namespace llvm;
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cl::opt<std::string>
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MArch("march", cl::desc("Architecture to generate code for (see --version)"));
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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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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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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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cl::opt<ThreadModel::Model>
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TMModel("thread-model",
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cl::desc("Choose threading model"),
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cl::init(ThreadModel::POSIX),
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cl::values(clEnumValN(ThreadModel::POSIX, "posix",
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"POSIX thread model"),
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clEnumValN(ThreadModel::Single, "single",
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"Single thread model"),
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clEnumValEnd));
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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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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"),
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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>
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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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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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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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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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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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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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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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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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cl::opt<llvm::FPOpFusion::FPOpFusionMode>
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FuseFPOps("fp-contract",
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cl::desc("Enable aggressive formation of fused FP ops"),
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cl::init(FPOpFusion::Standard),
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cl::values(
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clEnumValN(FPOpFusion::Fast, "fast",
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"Fuse FP ops whenever profitable"),
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clEnumValN(FPOpFusion::Standard, "on",
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"Only fuse 'blessed' FP ops."),
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clEnumValN(FPOpFusion::Strict, "off",
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"Only fuse FP ops when the result won't be effected."),
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clEnumValEnd));
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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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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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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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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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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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cl::opt<bool>
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EnablePIE("enable-pie",
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cl::desc("Assume the creation of a position independent executable."),
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cl::init(false));
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cl::opt<bool>
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UseCtors("use-ctors",
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cl::desc("Use .ctors instead of .init_array."),
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cl::init(false));
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cl::opt<std::string> StopAfter("stop-after",
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cl::desc("Stop compilation after a specific pass"),
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cl::value_desc("pass-name"),
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cl::init(""));
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cl::opt<std::string> StartAfter("start-after",
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cl::desc("Resume compilation after a specific pass"),
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cl::value_desc("pass-name"),
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cl::init(""));
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cl::opt<bool> DataSections("data-sections",
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cl::desc("Emit data into separate sections"),
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cl::init(false));
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cl::opt<bool>
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FunctionSections("function-sections",
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cl::desc("Emit functions into separate sections"),
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cl::init(false));
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cl::opt<llvm::JumpTable::JumpTableType>
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JTableType("jump-table-type",
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cl::desc("Choose the type of Jump-Instruction Table for jumptable."),
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cl::init(JumpTable::Single),
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cl::values(
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clEnumValN(JumpTable::Single, "single",
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"Create a single table for all jumptable functions"),
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clEnumValN(JumpTable::Arity, "arity",
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"Create one table per number of parameters."),
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clEnumValN(JumpTable::Simplified, "simplified",
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"Create one table per simplified function type."),
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clEnumValN(JumpTable::Full, "full",
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"Create one table per unique function type."),
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clEnumValEnd));
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cl::opt<bool>
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FCFI("fcfi",
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cl::desc("Apply forward-edge control-flow integrity"),
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cl::init(false));
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cl::opt<llvm::CFIntegrity>
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CFIType("cfi-type",
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cl::desc("Choose the type of Control-Flow Integrity check to add"),
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cl::init(CFIntegrity::Sub),
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cl::values(
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clEnumValN(CFIntegrity::Sub, "sub",
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"Subtract the pointer from the table base, then mask."),
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clEnumValN(CFIntegrity::Ror, "ror",
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"Use rotate to check the offset from a table base."),
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clEnumValN(CFIntegrity::Add, "add",
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"Mask out the high bits and add to an aligned base."),
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clEnumValEnd));
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cl::opt<bool>
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CFIEnforcing("cfi-enforcing",
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cl::desc("Enforce CFI or pass the violation to a function."),
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cl::init(false));
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// Note that this option is linked to the cfi-enforcing option above: if
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// cfi-enforcing is set, then the cfi-func-name option is entirely ignored. If
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// cfi-enforcing is false and no cfi-func-name is set, then a default function
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// will be generated that ignores all CFI violations. The expected signature for
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// functions called with CFI violations is
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//
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// void (i8*, i8*)
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//
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// The first pointer is a C string containing the name of the function in which
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// the violation occurs, and the second pointer is the pointer that violated
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// CFI.
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cl::opt<std::string>
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CFIFuncName("cfi-func-name", cl::desc("The name of the CFI function to call"),
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cl::init(""));
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// Common utility function tightly tied to the options listed here. Initializes
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// a TargetOptions object with CodeGen flags and returns it.
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static inline TargetOptions InitTargetOptionsFromCodeGenFlags() {
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TargetOptions Options;
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Options.LessPreciseFPMADOption = EnableFPMAD;
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Options.NoFramePointerElim = DisableFPElim;
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Options.AllowFPOpFusion = FuseFPOps;
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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.GuaranteedTailCallOpt = EnableGuaranteedTailCallOpt;
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Options.DisableTailCalls = DisableTailCalls;
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Options.StackAlignmentOverride = OverrideStackAlignment;
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Options.TrapFuncName = TrapFuncName;
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Options.PositionIndependentExecutable = EnablePIE;
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Options.UseInitArray = !UseCtors;
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Options.DataSections = DataSections;
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Options.FunctionSections = FunctionSections;
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Options.MCOptions = InitMCTargetOptionsFromFlags();
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Options.JTType = JTableType;
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Options.FCFI = FCFI;
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Options.CFIType = CFIType;
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Options.CFIEnforcing = CFIEnforcing;
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Options.CFIFuncName = CFIFuncName;
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Options.ThreadModel = TMModel;
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return Options;
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}
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#endif
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