[llvm] r210280 - Add a new attribute called 'jumptable' that creates jump-instruction tables for functions marked with this attribute.

Tom Roeder tmroeder at google.com
Thu Jun 5 14:51:07 PDT 2014


I've just committed a version that makes the triples fully qualified as

arm-unknown-linux-gnueabi
thumb-unknown-linux-gnueabi

I'll check back to see if that fixes the build on those machines.

On Thu, Jun 5, 2014 at 2:42 PM, Tom Roeder <tmroeder at google.com> wrote:
> Thanks. I don't know ARM that well; I just now tried with
> -mtriple=arm-eabi and -mtriple=thumb-eabi and that seems to work on my
> machine. But I don't have an ARM machine to try this on. Is that going
> to be sufficient, or does it need to be even more explicit?
>
> On Thu, Jun 5, 2014 at 2:26 PM, Aaron Ballman <aaron at aaronballman.com> wrote:
>> I'm getting something similar on Windows, and the bb agrees:
>>
>> http://bb.pgr.jp/builders/ninja-x64-msvc-RA-centos6/builds/3358/steps/test_all/logs/LLVM%20%3A%3A%20CodeGen__ARM__jump_tables.ll
>>
>> ~Aaron
>>
>> On Thu, Jun 5, 2014 at 5:25 PM, Kevin Enderby <enderby at apple.com> wrote:
>>> Hi Tom,
>>>
>>> Maybe your llvm/test/CodeGen/ARM/jump_tables.ll needs an explicit triple or something.  I’m seeing a failure with this test that can also be seem here:
>>>
>>> http://lab.llvm.org:8013/builders/clang-x86_64-darwin11-nobootstrap-RAincremental/builds/481/steps/run.llvm.tests/logs/stdio
>>>
>>> ...
>>> FAIL: LLVM :: CodeGen/ARM/jump_tables.ll (8771 of 18188)
>>> ******************** TEST 'LLVM :: CodeGen/ARM/jump_tables.ll' FAILED ********************
>>> Script:
>>> --
>>> /Users/buildslave/zorg/buildbot/smooshlab/slave-0.8/build.clang-x86_64-darwin11-nobootstrap-RAincremental/clang-build/Release+Asserts/bin/llc </Users/buildslave/zorg/buildbot/smooshlab/slave-0.8/build.clang-x86_64-darwin11-nobootstrap-RAincremental/llvm/test/CodeGen/ARM/jump_tables.ll -march=arm -jump-table-type=single | /Users/buildslave/zorg/buildbot/smooshlab/slave-0.8/build.clang-x86_64-darwin11-nobootstrap-RAincremental/clang-build/Release+Asserts/bin/FileCheck --check-prefix=ARM /Users/buildslave/zorg/buildbot/smooshlab/slave-0.8/build.clang-x86_64-darwin11-nobootstrap-RAincremental/llvm/test/CodeGen/ARM/jump_tables.ll
>>> /Users/buildslave/zorg/buildbot/smooshlab/slave-0.8/build.clang-x86_64-darwin11-nobootstrap-RAincremental/clang-build/Release+Asserts/bin/llc </Users/buildslave/zorg/buildbot/smooshlab/slave-0.8/build.clang-x86_64-darwin11-nobootstrap-RAincremental/llvm/test/CodeGen/ARM/jump_tables.ll -march=thumb -jump-table-type=single | /Users/buildslave/zorg/buildbot/smooshlab/slave-0.8/build.clang-x86_64-darwin11-nobootstrap-RAincremental/clang-build/Release+Asserts/bin/FileCheck --check-prefix=THUMB /Users/buildslave/zorg/buildbot/smooshlab/slave-0.8/build.clang-x86_64-darwin11-nobootstrap-RAincremental/llvm/test/CodeGen/ARM/jump_tables.ll
>>> --
>>> Exit Code: 1
>>>
>>> Command Output (stderr):
>>> --
>>> /Users/buildslave/zorg/buildbot/smooshlab/slave-0.8/build.clang-x86_64-darwin11-nobootstrap-RAincremental/llvm/test/CodeGen/ARM/jump_tables.ll:13:8: error: expected string not found in input
>>> ; ARM: .long __llvm_jump_instr_table_0_1
>>>        ^
>>> <stdin>:29:2: note: scanning from here
>>>  .long L___llvm_jump_instr_table_0_1$non_lazy_ptr-(LPC1_0+8)
>>>  ^
>>> <stdin>:32:3: note: possible intended match here
>>>  .globl __llvm_jump_instr_table_0_1
>>>   ^
>>>
>>>>>> ...
>>>
>>> Kev
>>>
>>> On Jun 5, 2014, at 12:29 PM, Tom Roeder <tmroeder at google.com> wrote:
>>>
>>>> Author: tmroeder
>>>> Date: Thu Jun  5 14:29:43 2014
>>>> New Revision: 210280
>>>>
>>>> URL: http://llvm.org/viewvc/llvm-project?rev=210280&view=rev
>>>> Log:
>>>> Add a new attribute called 'jumptable' that creates jump-instruction tables for functions marked with this attribute.
>>>> It includes a pass that rewrites all indirect calls to jumptable functions to pass through these tables.
>>>>
>>>> This also adds backend support for generating the jump-instruction tables on ARM and X86.
>>>> Note that since the jumptable attribute creates a second function pointer for a
>>>> function, any function marked with jumptable must also be marked with unnamed_addr.
>>>>
>>>> Added:
>>>>    llvm/trunk/include/llvm/Analysis/JumpInstrTableInfo.h
>>>>    llvm/trunk/include/llvm/CodeGen/JumpInstrTables.h
>>>>    llvm/trunk/lib/Analysis/JumpInstrTableInfo.cpp
>>>>    llvm/trunk/lib/CodeGen/JumpInstrTables.cpp
>>>>    llvm/trunk/test/CodeGen/ARM/jump_tables.ll
>>>>    llvm/trunk/test/CodeGen/X86/jump_table_alias.ll
>>>>    llvm/trunk/test/CodeGen/X86/jump_table_bitcast.ll
>>>>    llvm/trunk/test/CodeGen/X86/jump_tables.ll
>>>>    llvm/trunk/test/Verifier/jumptable.ll
>>>> Modified:
>>>>    llvm/trunk/docs/LangRef.rst
>>>>    llvm/trunk/include/llvm-c/Core.h
>>>>    llvm/trunk/include/llvm/Analysis/Passes.h
>>>>    llvm/trunk/include/llvm/Bitcode/LLVMBitCodes.h
>>>>    llvm/trunk/include/llvm/CodeGen/CommandFlags.h
>>>>    llvm/trunk/include/llvm/CodeGen/Passes.h
>>>>    llvm/trunk/include/llvm/IR/Attributes.h
>>>>    llvm/trunk/include/llvm/InitializePasses.h
>>>>    llvm/trunk/include/llvm/LinkAllPasses.h
>>>>    llvm/trunk/include/llvm/Target/TargetInstrInfo.h
>>>>    llvm/trunk/include/llvm/Target/TargetOptions.h
>>>>    llvm/trunk/lib/Analysis/Analysis.cpp
>>>>    llvm/trunk/lib/Analysis/CMakeLists.txt
>>>>    llvm/trunk/lib/AsmParser/LLLexer.cpp
>>>>    llvm/trunk/lib/AsmParser/LLParser.cpp
>>>>    llvm/trunk/lib/AsmParser/LLToken.h
>>>>    llvm/trunk/lib/Bitcode/Reader/BitcodeReader.cpp
>>>>    llvm/trunk/lib/Bitcode/Writer/BitcodeWriter.cpp
>>>>    llvm/trunk/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
>>>>    llvm/trunk/lib/CodeGen/CMakeLists.txt
>>>>    llvm/trunk/lib/CodeGen/LLVMTargetMachine.cpp
>>>>    llvm/trunk/lib/IR/Attributes.cpp
>>>>    llvm/trunk/lib/IR/Verifier.cpp
>>>>    llvm/trunk/lib/LTO/LTOCodeGenerator.cpp
>>>>    llvm/trunk/lib/Target/ARM/ARMBaseInstrInfo.cpp
>>>>    llvm/trunk/lib/Target/ARM/ARMBaseInstrInfo.h
>>>>    llvm/trunk/lib/Target/X86/X86InstrInfo.cpp
>>>>    llvm/trunk/lib/Target/X86/X86InstrInfo.h
>>>>    llvm/trunk/lib/Transforms/IPO/IPO.cpp
>>>>    llvm/trunk/test/Bitcode/attributes.ll
>>>>    llvm/trunk/test/CodeGen/Generic/stop-after.ll
>>>>
>>>> Modified: llvm/trunk/docs/LangRef.rst
>>>> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/docs/LangRef.rst?rev=210280&r1=210279&r2=210280&view=diff
>>>> ==============================================================================
>>>> --- llvm/trunk/docs/LangRef.rst (original)
>>>> +++ llvm/trunk/docs/LangRef.rst Thu Jun  5 14:29:43 2014
>>>> @@ -1020,6 +1020,14 @@ example:
>>>>     inlining this function is desirable (such as the "inline" keyword in
>>>>     C/C++). It is just a hint; it imposes no requirements on the
>>>>     inliner.
>>>> +``jumptable``
>>>> +    This attribute indicates that the function should be added to a
>>>> +    jump-instruction table at code-generation time, and that all address-taken
>>>> +    references to this function should be replaced with a reference to the
>>>> +    appropriate jump-instruction-table function pointer. Note that this creates
>>>> +    a new pointer for the original function, which means that code that depends
>>>> +    on function-pointer identity can break. So, any function annotated with
>>>> +    ``jumptable`` must also be ``unnamed_addr``.
>>>> ``minsize``
>>>>     This attribute suggests that optimization passes and code generator
>>>>     passes make choices that keep the code size of this function as small
>>>>
>>>> Modified: llvm/trunk/include/llvm-c/Core.h
>>>> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm-c/Core.h?rev=210280&r1=210279&r2=210280&view=diff
>>>> ==============================================================================
>>>> --- llvm/trunk/include/llvm-c/Core.h (original)
>>>> +++ llvm/trunk/include/llvm-c/Core.h Thu Jun  5 14:29:43 2014
>>>> @@ -166,7 +166,8 @@ typedef enum {
>>>>     LLVMCold = 1ULL << 34,
>>>>     LLVMOptimizeNone = 1ULL << 35,
>>>>     LLVMInAllocaAttribute = 1ULL << 36,
>>>> -    LLVMNonNullAttribute = 1ULL << 37
>>>> +    LLVMNonNullAttribute = 1ULL << 37,
>>>> +    LLVMJumpTableAttribute = 1ULL << 38,
>>>>     */
>>>> } LLVMAttribute;
>>>>
>>>>
>>>> Added: llvm/trunk/include/llvm/Analysis/JumpInstrTableInfo.h
>>>> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm/Analysis/JumpInstrTableInfo.h?rev=210280&view=auto
>>>> ==============================================================================
>>>> --- llvm/trunk/include/llvm/Analysis/JumpInstrTableInfo.h (added)
>>>> +++ llvm/trunk/include/llvm/Analysis/JumpInstrTableInfo.h Thu Jun  5 14:29:43 2014
>>>> @@ -0,0 +1,60 @@
>>>> +//===-- JumpInstrTableInfo.h: Info for Jump-Instruction Tables --*- C++ -*-===//
>>>> +//
>>>> +// This file is distributed under the University of Illinois Open Source
>>>> +// License. See LICENSE.TXT for details.
>>>> +//
>>>> +//===----------------------------------------------------------------------===//
>>>> +///
>>>> +/// \file
>>>> +/// \brief Information about jump-instruction tables that have been created by
>>>> +/// JumpInstrTables pass.
>>>> +///
>>>> +//===----------------------------------------------------------------------===//
>>>> +
>>>> +#ifndef LLVM_ANALYSIS_JUMPINSTRTABLEINFO_H
>>>> +#define LLVM_ANALYSIS_JUMPINSTRTABLEINFO_H
>>>> +
>>>> +#include "llvm/ADT/DenseMap.h"
>>>> +#include "llvm/Pass.h"
>>>> +
>>>> +#include <vector>
>>>> +
>>>> +namespace llvm {
>>>> +class Function;
>>>> +class FunctionType;
>>>> +
>>>> +/// This class stores information about jump-instruction tables created by the
>>>> +/// JumpInstrTables pass (in lib/CodeGen/JumpInstrTables.cpp). Each table is a
>>>> +/// map from a function type to a vector of pairs. The first element of each
>>>> +/// pair is the function that has the jumptable annotation. The second element
>>>> +/// is a function that was declared by JumpInstrTables and used to replace all
>>>> +/// address-taking sites for the original function.
>>>> +///
>>>> +/// The information in this pass is used in AsmPrinter
>>>> +/// (lib/CodeGen/AsmPrinter/AsmPrinter.cpp) to generate the required assembly
>>>> +/// for the jump-instruction tables.
>>>> +class JumpInstrTableInfo : public ImmutablePass {
>>>> +public:
>>>> +  static char ID;
>>>> +
>>>> +  JumpInstrTableInfo();
>>>> +  virtual ~JumpInstrTableInfo();
>>>> +  const char *getPassName() const override {
>>>> +    return "Jump-Instruction Table Info";
>>>> +  }
>>>> +
>>>> +  typedef std::pair<Function *, Function *> JumpPair;
>>>> +  typedef DenseMap<FunctionType *, std::vector<JumpPair> > JumpTables;
>>>> +
>>>> +  /// Inserts an entry in a table, adding the table if it doesn't exist.
>>>> +  void insertEntry(FunctionType *TableFunTy, Function *Target, Function *Jump);
>>>> +
>>>> +  /// Gets the tables.
>>>> +  const JumpTables &getTables() const { return Tables; }
>>>> +
>>>> +private:
>>>> +  JumpTables Tables;
>>>> +};
>>>> +}
>>>> +
>>>> +#endif /* LLVM_ANALYSIS_JUMPINSTRTABLEINFO_H */
>>>>
>>>> Modified: llvm/trunk/include/llvm/Analysis/Passes.h
>>>> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm/Analysis/Passes.h?rev=210280&r1=210279&r2=210280&view=diff
>>>> ==============================================================================
>>>> --- llvm/trunk/include/llvm/Analysis/Passes.h (original)
>>>> +++ llvm/trunk/include/llvm/Analysis/Passes.h Thu Jun  5 14:29:43 2014
>>>> @@ -142,6 +142,10 @@ namespace llvm {
>>>>   // information and prints it with -analyze.
>>>>   //
>>>>   FunctionPass *createMemDepPrinter();
>>>> +
>>>> +  // createJumpInstrTableInfoPass - This creates a pass that stores information
>>>> +  // about the jump tables created by JumpInstrTables
>>>> +  ImmutablePass *createJumpInstrTableInfoPass();
>>>> }
>>>>
>>>> #endif
>>>>
>>>> Modified: llvm/trunk/include/llvm/Bitcode/LLVMBitCodes.h
>>>> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm/Bitcode/LLVMBitCodes.h?rev=210280&r1=210279&r2=210280&view=diff
>>>> ==============================================================================
>>>> --- llvm/trunk/include/llvm/Bitcode/LLVMBitCodes.h (original)
>>>> +++ llvm/trunk/include/llvm/Bitcode/LLVMBitCodes.h Thu Jun  5 14:29:43 2014
>>>> @@ -372,7 +372,8 @@ namespace bitc {
>>>>     ATTR_KIND_COLD = 36,
>>>>     ATTR_KIND_OPTIMIZE_NONE = 37,
>>>>     ATTR_KIND_IN_ALLOCA = 38,
>>>> -    ATTR_KIND_NON_NULL = 39
>>>> +    ATTR_KIND_NON_NULL = 39,
>>>> +    ATTR_KIND_JUMP_TABLE = 40
>>>>   };
>>>>
>>>> } // End bitc namespace
>>>>
>>>> Modified: llvm/trunk/include/llvm/CodeGen/CommandFlags.h
>>>> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm/CodeGen/CommandFlags.h?rev=210280&r1=210279&r2=210280&view=diff
>>>> ==============================================================================
>>>> --- llvm/trunk/include/llvm/CodeGen/CommandFlags.h (original)
>>>> +++ llvm/trunk/include/llvm/CodeGen/CommandFlags.h Thu Jun  5 14:29:43 2014
>>>> @@ -202,6 +202,21 @@ FunctionSections("function-sections",
>>>>                  cl::desc("Emit functions into separate sections"),
>>>>                  cl::init(false));
>>>>
>>>> +cl::opt<llvm::JumpTable::JumpTableType>
>>>> +JTableType("jump-table-type",
>>>> +          cl::desc("Choose the type of Jump-Instruction Table for jumptable."),
>>>> +          cl::init(JumpTable::Single),
>>>> +          cl::values(
>>>> +              clEnumValN(JumpTable::Single, "single",
>>>> +                         "Create a single table for all jumptable functions"),
>>>> +              clEnumValN(JumpTable::Arity, "arity",
>>>> +                         "Create one table per number of parameters."),
>>>> +              clEnumValN(JumpTable::Simplified, "simplified",
>>>> +                         "Create one table per simplified function type."),
>>>> +              clEnumValN(JumpTable::Full, "full",
>>>> +                         "Create one table per unique function type."),
>>>> +              clEnumValEnd));
>>>> +
>>>> // Common utility function tightly tied to the options listed here. Initializes
>>>> // a TargetOptions object with CodeGen flags and returns it.
>>>> static inline TargetOptions InitTargetOptionsFromCodeGenFlags() {
>>>> @@ -228,6 +243,7 @@ static inline TargetOptions InitTargetOp
>>>>   Options.FunctionSections = FunctionSections;
>>>>
>>>>   Options.MCOptions = InitMCTargetOptionsFromFlags();
>>>> +  Options.JTType = JTableType;
>>>>
>>>>   return Options;
>>>> }
>>>>
>>>> Added: llvm/trunk/include/llvm/CodeGen/JumpInstrTables.h
>>>> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm/CodeGen/JumpInstrTables.h?rev=210280&view=auto
>>>> ==============================================================================
>>>> --- llvm/trunk/include/llvm/CodeGen/JumpInstrTables.h (added)
>>>> +++ llvm/trunk/include/llvm/CodeGen/JumpInstrTables.h Thu Jun  5 14:29:43 2014
>>>> @@ -0,0 +1,102 @@
>>>> +//===-- JumpInstrTables.h: Jump-Instruction Tables --------------*- C++ -*-===//
>>>> +//
>>>> +// This file is distributed under the University of Illinois Open Source
>>>> +// License. See LICENSE.TXT for details.
>>>> +//
>>>> +//===----------------------------------------------------------------------===//
>>>> +///
>>>> +/// \file
>>>> +/// \brief An implementation of tables consisting of jump instructions
>>>> +///
>>>> +//===----------------------------------------------------------------------===//
>>>> +
>>>> +#ifndef LLVM_CODEGEN_JUMPINSTRTABLES_H
>>>> +#define LLVM_CODEGEN_JUMPINSTRTABLES_H
>>>> +
>>>> +#include "llvm/ADT/DenseMap.h"
>>>> +#include "llvm/Pass.h"
>>>> +#include "llvm/Target/TargetOptions.h"
>>>> +
>>>> +namespace llvm {
>>>> +class Constant;
>>>> +class Function;
>>>> +class FunctionType;
>>>> +class JumpInstrTableInfo;
>>>> +class Module;
>>>> +
>>>> +/// A class to manage a set of jump tables indexed on function type. It looks at
>>>> +/// each function in the module to find all the functions that have the
>>>> +/// jumptable attribute set. For each such function, it creates a new
>>>> +/// jump-instruction-table function and stores the mapping in the ImmutablePass
>>>> +/// JumpInstrTableInfo.
>>>> +///
>>>> +/// These special functions get lowered in AsmPrinter to assembly of the form:
>>>> +///   .globl f
>>>> +///   .type f, at function
>>>> +///   .align 8,0x90
>>>> +/// f:
>>>> +///   jmp f_orig at PLT
>>>> +///
>>>> +/// Support for an architecture depends on two functions in TargetInstrInfo:
>>>> +/// getUnconditionalBranch, and getTrap. AsmPrinter uses these to generate the
>>>> +/// appropriate instructions for the jump statement (an unconditional branch)
>>>> +/// and for padding to make the table have a size that is a power of two. This
>>>> +/// padding uses a trap instruction to ensure that calls to this area halt the
>>>> +/// program. The default implementations of these functions call
>>>> +/// llvm_unreachable.
>>>> +class JumpInstrTables : public ModulePass {
>>>> +public:
>>>> +  static char ID;
>>>> +
>>>> +  JumpInstrTables();
>>>> +  JumpInstrTables(JumpTable::JumpTableType JTT);
>>>> +  virtual ~JumpInstrTables();
>>>> +  bool runOnModule(Module &M) override;
>>>> +  const char *getPassName() const override { return "Jump-Instruction Tables"; }
>>>> +  void getAnalysisUsage(AnalysisUsage &AU) const override;
>>>> +
>>>> +  /// Creates a jump-instruction table function for the Target and adds it to
>>>> +  /// the tables.
>>>> +  Function *insertEntry(Module &M, Function *Target);
>>>> +
>>>> +  /// Checks to see if there is already a table for the given FunctionType.
>>>> +  bool hasTable(FunctionType *FunTy);
>>>> +
>>>> +private:
>>>> +  /// The metadata used while a jump table is being built
>>>> +  struct TableMeta {
>>>> +    /// The number of this table
>>>> +    unsigned TableNum;
>>>> +
>>>> +    /// The current number of jump entries in the table.
>>>> +    unsigned Count;
>>>> +  };
>>>> +
>>>> +  typedef DenseMap<FunctionType *, struct TableMeta> JumpMap;
>>>> +
>>>> +  /// Maps the function into a subset of function types, depending on the
>>>> +  /// jump-instruction table style selected from JumpTableTypes in
>>>> +  /// JumpInstrTables.cpp. The choice of mapping determines the number of
>>>> +  /// jump-instruction tables generated by this pass. E.g., the simplest mapping
>>>> +  /// converts every function type into void f(); so, all functions end up in a
>>>> +  /// single table.
>>>> +  FunctionType *transformType(FunctionType *FunTy);
>>>> +
>>>> +  /// The current state of functions and jump entries in the table(s).
>>>> +  JumpMap Metadata;
>>>> +
>>>> +  /// The ImmutablePass that stores information about the generated tables.
>>>> +  JumpInstrTableInfo *JITI;
>>>> +
>>>> +  /// The total number of tables.
>>>> +  unsigned TableCount;
>>>> +
>>>> +  /// The type of tables to build.
>>>> +  JumpTable::JumpTableType JTType;
>>>> +};
>>>> +
>>>> +/// Creates a JumpInstrTables pass for the given type of jump table.
>>>> +ModulePass *createJumpInstrTablesPass(JumpTable::JumpTableType JTT);
>>>> +}
>>>> +
>>>> +#endif /* LLVM_CODEGEN_JUMPINSTRTABLES_H */
>>>>
>>>> Modified: llvm/trunk/include/llvm/CodeGen/Passes.h
>>>> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm/CodeGen/Passes.h?rev=210280&r1=210279&r2=210280&view=diff
>>>> ==============================================================================
>>>> --- llvm/trunk/include/llvm/CodeGen/Passes.h (original)
>>>> +++ llvm/trunk/include/llvm/CodeGen/Passes.h Thu Jun  5 14:29:43 2014
>>>> @@ -588,6 +588,8 @@ namespace llvm {
>>>>   /// the intrinsic for later emission to the StackMap.
>>>>   extern char &StackMapLivenessID;
>>>>
>>>> +  /// createJumpInstrTables - This pass creates jump-instruction tables.
>>>> +  ModulePass *createJumpInstrTablesPass();
>>>> } // End llvm namespace
>>>>
>>>> #endif
>>>>
>>>> Modified: llvm/trunk/include/llvm/IR/Attributes.h
>>>> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm/IR/Attributes.h?rev=210280&r1=210279&r2=210280&view=diff
>>>> ==============================================================================
>>>> --- llvm/trunk/include/llvm/IR/Attributes.h (original)
>>>> +++ llvm/trunk/include/llvm/IR/Attributes.h Thu Jun  5 14:29:43 2014
>>>> @@ -75,6 +75,7 @@ public:
>>>>     Cold,                  ///< Marks function as being in a cold path.
>>>>     InlineHint,            ///< Source said inlining was desirable
>>>>     InReg,                 ///< Force argument to be passed in register
>>>> +    JumpTable,             ///< Build jump-instruction tables and replace refs.
>>>>     MinSize,               ///< Function must be optimized for size first
>>>>     Naked,                 ///< Naked function
>>>>     Nest,                  ///< Nested function static chain
>>>>
>>>> Modified: llvm/trunk/include/llvm/InitializePasses.h
>>>> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm/InitializePasses.h?rev=210280&r1=210279&r2=210280&view=diff
>>>> ==============================================================================
>>>> --- llvm/trunk/include/llvm/InitializePasses.h (original)
>>>> +++ llvm/trunk/include/llvm/InitializePasses.h Thu Jun  5 14:29:43 2014
>>>> @@ -146,6 +146,8 @@ void initializeInstCountPass(PassRegistr
>>>> void initializeInstNamerPass(PassRegistry&);
>>>> void initializeInternalizePassPass(PassRegistry&);
>>>> void initializeIntervalPartitionPass(PassRegistry&);
>>>> +void initializeJumpInstrTableInfoPass(PassRegistry&);
>>>> +void initializeJumpInstrTablesPass(PassRegistry&);
>>>> void initializeJumpThreadingPass(PassRegistry&);
>>>> void initializeLCSSAPass(PassRegistry&);
>>>> void initializeLICMPass(PassRegistry&);
>>>>
>>>> Modified: llvm/trunk/include/llvm/LinkAllPasses.h
>>>> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm/LinkAllPasses.h?rev=210280&r1=210279&r2=210280&view=diff
>>>> ==============================================================================
>>>> --- llvm/trunk/include/llvm/LinkAllPasses.h (original)
>>>> +++ llvm/trunk/include/llvm/LinkAllPasses.h Thu Jun  5 14:29:43 2014
>>>> @@ -85,6 +85,8 @@ namespace {
>>>>       (void) llvm::createIndVarSimplifyPass();
>>>>       (void) llvm::createInstructionCombiningPass();
>>>>       (void) llvm::createInternalizePass();
>>>> +      (void) llvm::createJumpInstrTableInfoPass();
>>>> +      (void) llvm::createJumpInstrTablesPass();
>>>>       (void) llvm::createLCSSAPass();
>>>>       (void) llvm::createLICMPass();
>>>>       (void) llvm::createLazyValueInfoPass();
>>>>
>>>> Modified: llvm/trunk/include/llvm/Target/TargetInstrInfo.h
>>>> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm/Target/TargetInstrInfo.h?rev=210280&r1=210279&r2=210280&view=diff
>>>> ==============================================================================
>>>> --- llvm/trunk/include/llvm/Target/TargetInstrInfo.h (original)
>>>> +++ llvm/trunk/include/llvm/Target/TargetInstrInfo.h Thu Jun  5 14:29:43 2014
>>>> @@ -29,6 +29,7 @@ class MachineRegisterInfo;
>>>> class MDNode;
>>>> class MCInst;
>>>> class MCSchedModel;
>>>> +class MCSymbolRefExpr;
>>>> class SDNode;
>>>> class ScheduleHazardRecognizer;
>>>> class SelectionDAG;
>>>> @@ -321,6 +322,20 @@ public:
>>>>   virtual void ReplaceTailWithBranchTo(MachineBasicBlock::iterator Tail,
>>>>                                        MachineBasicBlock *NewDest) const;
>>>>
>>>> +  /// getUnconditionalBranch - Get an instruction that performs an unconditional
>>>> +  /// branch to the given symbol.
>>>> +  virtual void
>>>> +  getUnconditionalBranch(MCInst &MI,
>>>> +                         const MCSymbolRefExpr *BranchTarget) const {
>>>> +    llvm_unreachable("Target didn't implement "
>>>> +                     "TargetInstrInfo::getUnconditionalBranch!");
>>>> +  }
>>>> +
>>>> +  /// getTrap - Get a machine trap instruction
>>>> +  virtual void getTrap(MCInst &MI) const {
>>>> +    llvm_unreachable("Target didn't implement TargetInstrInfo::getTrap!");
>>>> +  }
>>>> +
>>>>   /// isLegalToSplitMBBAt - Return true if it's legal to split the given basic
>>>>   /// block at the specified instruction (i.e. instruction would be the start
>>>>   /// of a new basic block).
>>>>
>>>> Modified: llvm/trunk/include/llvm/Target/TargetOptions.h
>>>> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm/Target/TargetOptions.h?rev=210280&r1=210279&r2=210280&view=diff
>>>> ==============================================================================
>>>> --- llvm/trunk/include/llvm/Target/TargetOptions.h (original)
>>>> +++ llvm/trunk/include/llvm/Target/TargetOptions.h Thu Jun  5 14:29:43 2014
>>>> @@ -39,6 +39,17 @@ namespace llvm {
>>>>     };
>>>>   }
>>>>
>>>> +  namespace JumpTable {
>>>> +    enum JumpTableType {
>>>> +      Single,          // Use a single table for all indirect jumptable calls.
>>>> +      Arity,           // Use one table per number of function parameters.
>>>> +      Simplified,      // Use one table per function type, with types projected
>>>> +                       // into 4 types: pointer to non-function, struct,
>>>> +                       // primitive, and function pointer.
>>>> +      Full             // Use one table per unique function type
>>>> +    };
>>>> +  }
>>>> +
>>>>   class TargetOptions {
>>>>   public:
>>>>     TargetOptions()
>>>> @@ -54,7 +65,7 @@ namespace llvm {
>>>>           CompressDebugSections(false), FunctionSections(false),
>>>>           DataSections(false), TrapUnreachable(false), TrapFuncName(""),
>>>>           FloatABIType(FloatABI::Default),
>>>> -          AllowFPOpFusion(FPOpFusion::Standard) {}
>>>> +          AllowFPOpFusion(FPOpFusion::Standard), JTType(JumpTable::Single) {}
>>>>
>>>>     /// PrintMachineCode - This flag is enabled when the -print-machineinstrs
>>>>     /// option is specified on the command line, and should enable debugging
>>>> @@ -205,6 +216,10 @@ namespace llvm {
>>>>     /// the value of this option.
>>>>     FPOpFusion::FPOpFusionMode AllowFPOpFusion;
>>>>
>>>> +    /// JTType - This flag specifies the type of jump-instruction table to
>>>> +    /// create for functions that have the jumptable attribute.
>>>> +    JumpTable::JumpTableType JTType;
>>>> +
>>>>     /// Machine level options.
>>>>     MCTargetOptions MCOptions;
>>>>   };
>>>>
>>>> Modified: llvm/trunk/lib/Analysis/Analysis.cpp
>>>> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Analysis/Analysis.cpp?rev=210280&r1=210279&r2=210280&view=diff
>>>> ==============================================================================
>>>> --- llvm/trunk/lib/Analysis/Analysis.cpp (original)
>>>> +++ llvm/trunk/lib/Analysis/Analysis.cpp Thu Jun  5 14:29:43 2014
>>>> @@ -48,6 +48,7 @@ void llvm::initializeAnalysis(PassRegist
>>>>   initializeIVUsersPass(Registry);
>>>>   initializeInstCountPass(Registry);
>>>>   initializeIntervalPartitionPass(Registry);
>>>> +  initializeJumpInstrTableInfoPass(Registry);
>>>>   initializeLazyValueInfoPass(Registry);
>>>>   initializeLibCallAliasAnalysisPass(Registry);
>>>>   initializeLintPass(Registry);
>>>>
>>>> Modified: llvm/trunk/lib/Analysis/CMakeLists.txt
>>>> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Analysis/CMakeLists.txt?rev=210280&r1=210279&r2=210280&view=diff
>>>> ==============================================================================
>>>> --- llvm/trunk/lib/Analysis/CMakeLists.txt (original)
>>>> +++ llvm/trunk/lib/Analysis/CMakeLists.txt Thu Jun  5 14:29:43 2014
>>>> @@ -25,6 +25,7 @@ add_llvm_library(LLVMAnalysis
>>>>   InstructionSimplify.cpp
>>>>   Interval.cpp
>>>>   IntervalPartition.cpp
>>>> +  JumpInstrTableInfo.cpp
>>>>   LazyCallGraph.cpp
>>>>   LazyValueInfo.cpp
>>>>   LibCallAliasAnalysis.cpp
>>>>
>>>> Added: llvm/trunk/lib/Analysis/JumpInstrTableInfo.cpp
>>>> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Analysis/JumpInstrTableInfo.cpp?rev=210280&view=auto
>>>> ==============================================================================
>>>> --- llvm/trunk/lib/Analysis/JumpInstrTableInfo.cpp (added)
>>>> +++ llvm/trunk/lib/Analysis/JumpInstrTableInfo.cpp Thu Jun  5 14:29:43 2014
>>>> @@ -0,0 +1,40 @@
>>>> +//===-- JumpInstrTableInfo.cpp: Info for Jump-Instruction Tables ----------===//
>>>> +//
>>>> +// This file is distributed under the University of Illinois Open Source
>>>> +// License. See LICENSE.TXT for details.
>>>> +//
>>>> +//===----------------------------------------------------------------------===//
>>>> +///
>>>> +/// \file
>>>> +/// \brief Information about jump-instruction tables that have been created by
>>>> +/// JumpInstrTables pass.
>>>> +///
>>>> +//===----------------------------------------------------------------------===//
>>>> +
>>>> +#define DEBUG_TYPE "jiti"
>>>> +
>>>> +#include "llvm/Analysis/JumpInstrTableInfo.h"
>>>> +#include "llvm/Analysis/Passes.h"
>>>> +#include "llvm/IR/Function.h"
>>>> +#include "llvm/IR/Type.h"
>>>> +
>>>> +using namespace llvm;
>>>> +
>>>> +INITIALIZE_PASS(JumpInstrTableInfo, "jump-instr-table-info",
>>>> +                "Jump-Instruction Table Info", true, true)
>>>> +char JumpInstrTableInfo::ID = 0;
>>>> +
>>>> +ImmutablePass *llvm::createJumpInstrTableInfoPass() {
>>>> +  return new JumpInstrTableInfo();
>>>> +}
>>>> +
>>>> +JumpInstrTableInfo::JumpInstrTableInfo() : ImmutablePass(ID), Tables() {
>>>> +  initializeJumpInstrTableInfoPass(*PassRegistry::getPassRegistry());
>>>> +}
>>>> +
>>>> +JumpInstrTableInfo::~JumpInstrTableInfo() {}
>>>> +
>>>> +void JumpInstrTableInfo::insertEntry(FunctionType *TableFunTy, Function *Target,
>>>> +                                     Function *Jump) {
>>>> +  Tables[TableFunTy].push_back(JumpPair(Target, Jump));
>>>> +}
>>>>
>>>> Modified: llvm/trunk/lib/AsmParser/LLLexer.cpp
>>>> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/AsmParser/LLLexer.cpp?rev=210280&r1=210279&r2=210280&view=diff
>>>> ==============================================================================
>>>> --- llvm/trunk/lib/AsmParser/LLLexer.cpp (original)
>>>> +++ llvm/trunk/lib/AsmParser/LLLexer.cpp Thu Jun  5 14:29:43 2014
>>>> @@ -583,6 +583,7 @@ lltok::Kind LLLexer::LexIdentifier() {
>>>>   KEYWORD(cold);
>>>>   KEYWORD(inlinehint);
>>>>   KEYWORD(inreg);
>>>> +  KEYWORD(jumptable);
>>>>   KEYWORD(minsize);
>>>>   KEYWORD(naked);
>>>>   KEYWORD(nest);
>>>>
>>>> Modified: llvm/trunk/lib/AsmParser/LLParser.cpp
>>>> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/AsmParser/LLParser.cpp?rev=210280&r1=210279&r2=210280&view=diff
>>>> ==============================================================================
>>>> --- llvm/trunk/lib/AsmParser/LLParser.cpp (original)
>>>> +++ llvm/trunk/lib/AsmParser/LLParser.cpp Thu Jun  5 14:29:43 2014
>>>> @@ -947,6 +947,7 @@ bool LLParser::ParseFnAttributeValuePair
>>>>     case lltok::kw_builtin:           B.addAttribute(Attribute::Builtin); break;
>>>>     case lltok::kw_cold:              B.addAttribute(Attribute::Cold); break;
>>>>     case lltok::kw_inlinehint:        B.addAttribute(Attribute::InlineHint); break;
>>>> +    case lltok::kw_jumptable:         B.addAttribute(Attribute::JumpTable); break;
>>>>     case lltok::kw_minsize:           B.addAttribute(Attribute::MinSize); break;
>>>>     case lltok::kw_naked:             B.addAttribute(Attribute::Naked); break;
>>>>     case lltok::kw_nobuiltin:         B.addAttribute(Attribute::NoBuiltin); break;
>>>> @@ -1210,6 +1211,7 @@ bool LLParser::ParseOptionalParamAttrs(A
>>>>     case lltok::kw_alwaysinline:
>>>>     case lltok::kw_builtin:
>>>>     case lltok::kw_inlinehint:
>>>> +    case lltok::kw_jumptable:
>>>>     case lltok::kw_minsize:
>>>>     case lltok::kw_naked:
>>>>     case lltok::kw_nobuiltin:
>>>> @@ -1271,6 +1273,7 @@ bool LLParser::ParseOptionalReturnAttrs(
>>>>     case lltok::kw_builtin:
>>>>     case lltok::kw_cold:
>>>>     case lltok::kw_inlinehint:
>>>> +    case lltok::kw_jumptable:
>>>>     case lltok::kw_minsize:
>>>>     case lltok::kw_naked:
>>>>     case lltok::kw_nobuiltin:
>>>>
>>>> Modified: llvm/trunk/lib/AsmParser/LLToken.h
>>>> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/AsmParser/LLToken.h?rev=210280&r1=210279&r2=210280&view=diff
>>>> ==============================================================================
>>>> --- llvm/trunk/lib/AsmParser/LLToken.h (original)
>>>> +++ llvm/trunk/lib/AsmParser/LLToken.h Thu Jun  5 14:29:43 2014
>>>> @@ -107,6 +107,7 @@ namespace lltok {
>>>>     kw_cold,
>>>>     kw_inlinehint,
>>>>     kw_inreg,
>>>> +    kw_jumptable,
>>>>     kw_minsize,
>>>>     kw_naked,
>>>>     kw_nest,
>>>>
>>>> Modified: llvm/trunk/lib/Bitcode/Reader/BitcodeReader.cpp
>>>> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Bitcode/Reader/BitcodeReader.cpp?rev=210280&r1=210279&r2=210280&view=diff
>>>> ==============================================================================
>>>> --- llvm/trunk/lib/Bitcode/Reader/BitcodeReader.cpp (original)
>>>> +++ llvm/trunk/lib/Bitcode/Reader/BitcodeReader.cpp Thu Jun  5 14:29:43 2014
>>>> @@ -549,6 +549,8 @@ static Attribute::AttrKind GetAttrFromCo
>>>>     return Attribute::InlineHint;
>>>>   case bitc::ATTR_KIND_IN_REG:
>>>>     return Attribute::InReg;
>>>> +  case bitc::ATTR_KIND_JUMP_TABLE:
>>>> +    return Attribute::JumpTable;
>>>>   case bitc::ATTR_KIND_MIN_SIZE:
>>>>     return Attribute::MinSize;
>>>>   case bitc::ATTR_KIND_NAKED:
>>>>
>>>> Modified: llvm/trunk/lib/Bitcode/Writer/BitcodeWriter.cpp
>>>> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Bitcode/Writer/BitcodeWriter.cpp?rev=210280&r1=210279&r2=210280&view=diff
>>>> ==============================================================================
>>>> --- llvm/trunk/lib/Bitcode/Writer/BitcodeWriter.cpp (original)
>>>> +++ llvm/trunk/lib/Bitcode/Writer/BitcodeWriter.cpp Thu Jun  5 14:29:43 2014
>>>> @@ -177,6 +177,8 @@ static uint64_t getAttrKindEncoding(Attr
>>>>     return bitc::ATTR_KIND_INLINE_HINT;
>>>>   case Attribute::InReg:
>>>>     return bitc::ATTR_KIND_IN_REG;
>>>> +  case Attribute::JumpTable:
>>>> +    return bitc::ATTR_KIND_JUMP_TABLE;
>>>>   case Attribute::MinSize:
>>>>     return bitc::ATTR_KIND_MIN_SIZE;
>>>>   case Attribute::Naked:
>>>>
>>>> Modified: llvm/trunk/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
>>>> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/AsmPrinter/AsmPrinter.cpp?rev=210280&r1=210279&r2=210280&view=diff
>>>> ==============================================================================
>>>> --- llvm/trunk/lib/CodeGen/AsmPrinter/AsmPrinter.cpp (original)
>>>> +++ llvm/trunk/lib/CodeGen/AsmPrinter/AsmPrinter.cpp Thu Jun  5 14:29:43 2014
>>>> @@ -18,6 +18,7 @@
>>>> #include "llvm/ADT/SmallString.h"
>>>> #include "llvm/ADT/Statistic.h"
>>>> #include "llvm/Analysis/ConstantFolding.h"
>>>> +#include "llvm/Analysis/JumpInstrTableInfo.h"
>>>> #include "llvm/CodeGen/GCMetadataPrinter.h"
>>>> #include "llvm/CodeGen/MachineConstantPool.h"
>>>> #include "llvm/CodeGen/MachineFrameInfo.h"
>>>> @@ -889,6 +890,54 @@ bool AsmPrinter::doFinalization(Module &
>>>>     EmitVisibility(Name, V, false);
>>>>   }
>>>>
>>>> +  // Get information about jump-instruction tables to print.
>>>> +  JumpInstrTableInfo *JITI = getAnalysisIfAvailable<JumpInstrTableInfo>();
>>>> +
>>>> +  if (JITI && !JITI->getTables().empty()) {
>>>> +    unsigned Arch = Triple(getTargetTriple()).getArch();
>>>> +    bool IsThumb = (Arch == Triple::thumb || Arch == Triple::thumbeb);
>>>> +    MCInst TrapInst;
>>>> +    TM.getInstrInfo()->getTrap(TrapInst);
>>>> +    for (const auto &KV : JITI->getTables()) {
>>>> +      uint64_t Count = 0;
>>>> +      for (const auto &FunPair : KV.second) {
>>>> +        // Emit the function labels to make this be a function entry point.
>>>> +        MCSymbol *FunSym =
>>>> +          OutContext.GetOrCreateSymbol(FunPair.second->getName());
>>>> +        OutStreamer.EmitSymbolAttribute(FunSym, MCSA_Global);
>>>> +        // FIXME: JumpTableInstrInfo should store information about the required
>>>> +        // alignment of table entries and the size of the padding instruction.
>>>> +        EmitAlignment(3);
>>>> +        if (IsThumb)
>>>> +          OutStreamer.EmitThumbFunc(FunSym);
>>>> +        if (MAI->hasDotTypeDotSizeDirective())
>>>> +          OutStreamer.EmitSymbolAttribute(FunSym, MCSA_ELF_TypeFunction);
>>>> +        OutStreamer.EmitLabel(FunSym);
>>>> +
>>>> +        // Emit the jump instruction to transfer control to the original
>>>> +        // function.
>>>> +        MCInst JumpToFun;
>>>> +        MCSymbol *TargetSymbol =
>>>> +          OutContext.GetOrCreateSymbol(FunPair.first->getName());
>>>> +        const MCSymbolRefExpr *TargetSymRef =
>>>> +          MCSymbolRefExpr::Create(TargetSymbol, MCSymbolRefExpr::VK_PLT,
>>>> +                                  OutContext);
>>>> +        TM.getInstrInfo()->getUnconditionalBranch(JumpToFun, TargetSymRef);
>>>> +        OutStreamer.EmitInstruction(JumpToFun, getSubtargetInfo());
>>>> +        ++Count;
>>>> +      }
>>>> +
>>>> +      // Emit enough padding instructions to fill up to the next power of two.
>>>> +      // This assumes that the trap instruction takes 8 bytes or fewer.
>>>> +      uint64_t Remaining = NextPowerOf2(Count) - Count;
>>>> +      for (uint64_t C = 0; C < Remaining; ++C) {
>>>> +        EmitAlignment(3);
>>>> +        OutStreamer.EmitInstruction(TrapInst, getSubtargetInfo());
>>>> +      }
>>>> +
>>>> +    }
>>>> +  }
>>>> +
>>>>   // Emit module flags.
>>>>   SmallVector<Module::ModuleFlagEntry, 8> ModuleFlags;
>>>>   M.getModuleFlagsMetadata(ModuleFlags);
>>>>
>>>> Modified: llvm/trunk/lib/CodeGen/CMakeLists.txt
>>>> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/CMakeLists.txt?rev=210280&r1=210279&r2=210280&view=diff
>>>> ==============================================================================
>>>> --- llvm/trunk/lib/CodeGen/CMakeLists.txt (original)
>>>> +++ llvm/trunk/lib/CodeGen/CMakeLists.txt Thu Jun  5 14:29:43 2014
>>>> @@ -27,6 +27,7 @@ add_llvm_library(LLVMCodeGen
>>>>   InterferenceCache.cpp
>>>>   IntrinsicLowering.cpp
>>>>   JITCodeEmitter.cpp
>>>> +  JumpInstrTables.cpp
>>>>   LLVMTargetMachine.cpp
>>>>   LatencyPriorityQueue.cpp
>>>>   LexicalScopes.cpp
>>>>
>>>> Added: llvm/trunk/lib/CodeGen/JumpInstrTables.cpp
>>>> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/JumpInstrTables.cpp?rev=210280&view=auto
>>>> ==============================================================================
>>>> --- llvm/trunk/lib/CodeGen/JumpInstrTables.cpp (added)
>>>> +++ llvm/trunk/lib/CodeGen/JumpInstrTables.cpp Thu Jun  5 14:29:43 2014
>>>> @@ -0,0 +1,301 @@
>>>> +//===-- JumpInstrTables.cpp: Jump-Instruction Tables ----------------------===//
>>>> +//
>>>> +// This file is distributed under the University of Illinois Open Source
>>>> +// License. See LICENSE.TXT for details.
>>>> +//
>>>> +//===----------------------------------------------------------------------===//
>>>> +///
>>>> +/// \file
>>>> +/// \brief An implementation of jump-instruction tables.
>>>> +///
>>>> +//===----------------------------------------------------------------------===//
>>>> +
>>>> +#define DEBUG_TYPE "jt"
>>>> +
>>>> +#include "llvm/CodeGen/JumpInstrTables.h"
>>>> +
>>>> +#include "llvm/ADT/Statistic.h"
>>>> +#include "llvm/Analysis/JumpInstrTableInfo.h"
>>>> +#include "llvm/CodeGen/Passes.h"
>>>> +#include "llvm/IR/Attributes.h"
>>>> +#include "llvm/IR/CallSite.h"
>>>> +#include "llvm/IR/Constants.h"
>>>> +#include "llvm/IR/DerivedTypes.h"
>>>> +#include "llvm/IR/Function.h"
>>>> +#include "llvm/IR/LLVMContext.h"
>>>> +#include "llvm/IR/Module.h"
>>>> +#include "llvm/IR/Operator.h"
>>>> +#include "llvm/IR/Type.h"
>>>> +#include "llvm/IR/Verifier.h"
>>>> +#include "llvm/Support/CommandLine.h"
>>>> +#include "llvm/Support/Debug.h"
>>>> +#include "llvm/Support/raw_ostream.h"
>>>> +
>>>> +#include <vector>
>>>> +
>>>> +using namespace llvm;
>>>> +
>>>> +char JumpInstrTables::ID = 0;
>>>> +
>>>> +INITIALIZE_PASS_BEGIN(JumpInstrTables, "jump-instr-tables",
>>>> +                      "Jump-Instruction Tables", true, true)
>>>> +INITIALIZE_PASS_DEPENDENCY(JumpInstrTableInfo);
>>>> +INITIALIZE_PASS_END(JumpInstrTables, "jump-instr-tables",
>>>> +                    "Jump-Instruction Tables", true, true)
>>>> +
>>>> +STATISTIC(NumJumpTables, "Number of indirect call tables generated");
>>>> +STATISTIC(NumFuncsInJumpTables, "Number of functions in the jump tables");
>>>> +
>>>> +ModulePass *llvm::createJumpInstrTablesPass() {
>>>> +  // The default implementation uses a single table for all functions.
>>>> +  return new JumpInstrTables(JumpTable::Single);
>>>> +}
>>>> +
>>>> +ModulePass *llvm::createJumpInstrTablesPass(JumpTable::JumpTableType JTT) {
>>>> +  return new JumpInstrTables(JTT);
>>>> +}
>>>> +
>>>> +namespace {
>>>> +static const char jump_func_prefix[] = "__llvm_jump_instr_table_";
>>>> +static const char jump_section_prefix[] = ".jump.instr.table.text.";
>>>> +
>>>> +// Checks to see if a given CallSite is making an indirect call, including
>>>> +// cases where the indirect call is made through a bitcast.
>>>> +bool isIndirectCall(CallSite &CS) {
>>>> +  if (CS.getCalledFunction())
>>>> +    return false;
>>>> +
>>>> +  // Check the value to see if it is merely a bitcast of a function. In
>>>> +  // this case, it will translate to a direct function call in the resulting
>>>> +  // assembly, so we won't treat it as an indirect call here.
>>>> +  const Value *V = CS.getCalledValue();
>>>> +  if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(V)) {
>>>> +    return !(CE->isCast() && isa<Function>(CE->getOperand(0)));
>>>> +  }
>>>> +
>>>> +  // Otherwise, since we know it's a call, it must be an indirect call
>>>> +  return true;
>>>> +}
>>>> +
>>>> +// Replaces Functions and GlobalAliases with a different Value.
>>>> +bool replaceGlobalValueIndirectUse(GlobalValue *GV, Value *V, Use *U) {
>>>> +  User *Us = U->getUser();
>>>> +  if (!Us)
>>>> +    return false;
>>>> +  if (Instruction *I = dyn_cast<Instruction>(Us)) {
>>>> +    CallSite CS(I);
>>>> +
>>>> +    // Don't do the replacement if this use is a direct call to this function.
>>>> +    // If the use is not the called value, then replace it.
>>>> +    if (CS && (isIndirectCall(CS) || CS.isCallee(U))) {
>>>> +      return false;
>>>> +    }
>>>> +
>>>> +    U->set(V);
>>>> +  } else if (Constant *C = dyn_cast<Constant>(Us)) {
>>>> +    // Don't replace calls to bitcasts of function symbols, since they get
>>>> +    // translated to direct calls.
>>>> +    if (ConstantExpr *CE = dyn_cast<ConstantExpr>(Us)) {
>>>> +      if (CE->getOpcode() == Instruction::BitCast) {
>>>> +        // This bitcast must have exactly one user.
>>>> +        if (CE->user_begin() != CE->user_end()) {
>>>> +          User *ParentUs = *CE->user_begin();
>>>> +          if (CallInst *CI = dyn_cast<CallInst>(ParentUs)) {
>>>> +            CallSite CS(CI);
>>>> +            Use &CEU = *CE->use_begin();
>>>> +            if (CS.isCallee(&CEU)) {
>>>> +              return false;
>>>> +            }
>>>> +          }
>>>> +        }
>>>> +      }
>>>> +    }
>>>> +
>>>> +    // GlobalAlias doesn't support replaceUsesOfWithOnConstant. And the verifier
>>>> +    // requires alias to point to a defined function. So, GlobalAlias is handled
>>>> +    // as a separate case in runOnModule.
>>>> +    if (!isa<GlobalAlias>(C))
>>>> +      C->replaceUsesOfWithOnConstant(GV, V, U);
>>>> +  } else {
>>>> +    assert(false && "The Use of a Function symbol is neither an instruction nor"
>>>> +                    " a constant");
>>>> +  }
>>>> +
>>>> +  return true;
>>>> +}
>>>> +
>>>> +// Replaces all replaceable address-taken uses of GV with a pointer to a
>>>> +// jump-instruction table entry.
>>>> +void replaceValueWithFunction(GlobalValue *GV, Function *F) {
>>>> +  // Go through all uses of this function and replace the uses of GV with the
>>>> +  // jump-table version of the function. Get the uses as a vector before
>>>> +  // replacing them, since replacing them changes the use list and invalidates
>>>> +  // the iterator otherwise.
>>>> +  for (Value::use_iterator I = GV->use_begin(), E = GV->use_end(); I != E;) {
>>>> +    Use &U = *I++;
>>>> +
>>>> +    // Replacement of constants replaces all instances in the constant. So, some
>>>> +    // uses might have already been handled by the time we reach them here.
>>>> +    if (U.get() == GV)
>>>> +      replaceGlobalValueIndirectUse(GV, F, &U);
>>>> +  }
>>>> +
>>>> +  return;
>>>> +}
>>>> +} // end anonymous namespace
>>>> +
>>>> +JumpInstrTables::JumpInstrTables()
>>>> +    : ModulePass(ID), Metadata(), JITI(nullptr), TableCount(0),
>>>> +      JTType(JumpTable::Single) {
>>>> +  initializeJumpInstrTablesPass(*PassRegistry::getPassRegistry());
>>>> +}
>>>> +
>>>> +JumpInstrTables::JumpInstrTables(JumpTable::JumpTableType JTT)
>>>> +    : ModulePass(ID), Metadata(), JITI(nullptr), TableCount(0), JTType(JTT) {
>>>> +  initializeJumpInstrTablesPass(*PassRegistry::getPassRegistry());
>>>> +}
>>>> +
>>>> +JumpInstrTables::~JumpInstrTables() {}
>>>> +
>>>> +void JumpInstrTables::getAnalysisUsage(AnalysisUsage &AU) const {
>>>> +  AU.addRequired<JumpInstrTableInfo>();
>>>> +}
>>>> +
>>>> +Function *JumpInstrTables::insertEntry(Module &M, Function *Target) {
>>>> +  FunctionType *OrigFunTy = Target->getFunctionType();
>>>> +  FunctionType *FunTy = transformType(OrigFunTy);
>>>> +
>>>> +  JumpMap::iterator it = Metadata.find(FunTy);
>>>> +  if (Metadata.end() == it) {
>>>> +    struct TableMeta Meta;
>>>> +    Meta.TableNum = TableCount;
>>>> +    Meta.Count = 0;
>>>> +    Metadata[FunTy] = Meta;
>>>> +    it = Metadata.find(FunTy);
>>>> +    ++NumJumpTables;
>>>> +    ++TableCount;
>>>> +  }
>>>> +
>>>> +  it->second.Count++;
>>>> +
>>>> +  std::string NewName(jump_func_prefix);
>>>> +  NewName += (Twine(it->second.TableNum) + "_" + Twine(it->second.Count)).str();
>>>> +  Function *JumpFun =
>>>> +      Function::Create(OrigFunTy, GlobalValue::ExternalLinkage, NewName, &M);
>>>> +  // The section for this table
>>>> +  JumpFun->setSection((jump_section_prefix + Twine(it->second.TableNum)).str());
>>>> +  JITI->insertEntry(FunTy, Target, JumpFun);
>>>> +
>>>> +  ++NumFuncsInJumpTables;
>>>> +  return JumpFun;
>>>> +}
>>>> +
>>>> +bool JumpInstrTables::hasTable(FunctionType *FunTy) {
>>>> +  FunctionType *TransTy = transformType(FunTy);
>>>> +  return Metadata.end() != Metadata.find(TransTy);
>>>> +}
>>>> +
>>>> +FunctionType *JumpInstrTables::transformType(FunctionType *FunTy) {
>>>> +  // Returning nullptr forces all types into the same table, since all types map
>>>> +  // to the same type
>>>> +  Type *VoidPtrTy = Type::getInt8PtrTy(FunTy->getContext());
>>>> +
>>>> +  // Ignore the return type.
>>>> +  Type *RetTy = VoidPtrTy;
>>>> +  bool IsVarArg = FunTy->isVarArg();
>>>> +  std::vector<Type *> ParamTys(FunTy->getNumParams());
>>>> +  FunctionType::param_iterator PI, PE;
>>>> +  int i = 0;
>>>> +
>>>> +  std::vector<Type *> EmptyParams;
>>>> +  Type *Int32Ty = Type::getInt32Ty(FunTy->getContext());
>>>> +  FunctionType *VoidFnTy = FunctionType::get(
>>>> +      Type::getVoidTy(FunTy->getContext()), EmptyParams, false);
>>>> +  switch (JTType) {
>>>> +  case JumpTable::Single:
>>>> +
>>>> +    return FunctionType::get(RetTy, EmptyParams, false);
>>>> +  case JumpTable::Arity:
>>>> +    // Transform all types to void* so that all functions with the same arity
>>>> +    // end up in the same table.
>>>> +    for (PI = FunTy->param_begin(), PE = FunTy->param_end(); PI != PE;
>>>> +         PI++, i++) {
>>>> +      ParamTys[i] = VoidPtrTy;
>>>> +    }
>>>> +
>>>> +    return FunctionType::get(RetTy, ParamTys, IsVarArg);
>>>> +  case JumpTable::Simplified:
>>>> +    // Project all parameters types to one of 3 types: composite, integer, and
>>>> +    // function, matching the three subclasses of Type.
>>>> +    for (PI = FunTy->param_begin(), PE = FunTy->param_end(); PI != PE;
>>>> +         ++PI, ++i) {
>>>> +      assert((isa<IntegerType>(*PI) || isa<FunctionType>(*PI) ||
>>>> +              isa<CompositeType>(*PI)) &&
>>>> +             "This type is not an Integer or a Composite or a Function");
>>>> +      if (isa<CompositeType>(*PI)) {
>>>> +        ParamTys[i] = VoidPtrTy;
>>>> +      } else if (isa<FunctionType>(*PI)) {
>>>> +        ParamTys[i] = VoidFnTy;
>>>> +      } else if (isa<IntegerType>(*PI)) {
>>>> +        ParamTys[i] = Int32Ty;
>>>> +      }
>>>> +    }
>>>> +
>>>> +    return FunctionType::get(RetTy, ParamTys, IsVarArg);
>>>> +  case JumpTable::Full:
>>>> +    // Don't transform this type at all.
>>>> +    return FunTy;
>>>> +  }
>>>> +
>>>> +  return nullptr;
>>>> +}
>>>> +
>>>> +bool JumpInstrTables::runOnModule(Module &M) {
>>>> +  // Make sure the module is well-formed, especially with respect to jumptable.
>>>> +  if (verifyModule(M))
>>>> +    return false;
>>>> +
>>>> +  JITI = &getAnalysis<JumpInstrTableInfo>();
>>>> +
>>>> +  // Get the set of jumptable-annotated functions.
>>>> +  DenseMap<Function *, Function *> Functions;
>>>> +  for (Function &F : M) {
>>>> +    if (F.hasFnAttribute(Attribute::JumpTable)) {
>>>> +      assert(F.hasUnnamedAddr() &&
>>>> +             "Attribute 'jumptable' requires 'unnamed_addr'");
>>>> +      Functions[&F] = NULL;
>>>> +    }
>>>> +  }
>>>> +
>>>> +  // Create the jump-table functions.
>>>> +  for (auto &KV : Functions) {
>>>> +    Function *F = KV.first;
>>>> +    KV.second = insertEntry(M, F);
>>>> +  }
>>>> +
>>>> +  // GlobalAlias is a special case, because the target of an alias statement
>>>> +  // must be a defined function. So, instead of replacing a given function in
>>>> +  // the alias, we replace all uses of aliases that target jumptable functions.
>>>> +  // Note that there's no need to create these functions, since only aliases
>>>> +  // that target known jumptable functions are replaced, and there's no way to
>>>> +  // put the jumptable annotation on a global alias.
>>>> +  DenseMap<GlobalAlias *, Function *> Aliases;
>>>> +  for (GlobalAlias &GA : M.aliases()) {
>>>> +    Constant *Aliasee = GA.getAliasee();
>>>> +    if (Function *F = dyn_cast<Function>(Aliasee)) {
>>>> +      auto it = Functions.find(F);
>>>> +      if (it != Functions.end()) {
>>>> +        Aliases[&GA] = it->second;
>>>> +      }
>>>> +    }
>>>> +  }
>>>> +
>>>> +  // Replace each address taken function with its jump-instruction table entry.
>>>> +  for (auto &KV : Functions)
>>>> +    replaceValueWithFunction(KV.first, KV.second);
>>>> +
>>>> +  for (auto &KV : Aliases)
>>>> +    replaceValueWithFunction(KV.first, KV.second);
>>>> +
>>>> +  return !Functions.empty();
>>>> +}
>>>>
>>>> Modified: llvm/trunk/lib/CodeGen/LLVMTargetMachine.cpp
>>>> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/LLVMTargetMachine.cpp?rev=210280&r1=210279&r2=210280&view=diff
>>>> ==============================================================================
>>>> --- llvm/trunk/lib/CodeGen/LLVMTargetMachine.cpp (original)
>>>> +++ llvm/trunk/lib/CodeGen/LLVMTargetMachine.cpp Thu Jun  5 14:29:43 2014
>>>> @@ -12,11 +12,15 @@
>>>> //===----------------------------------------------------------------------===//
>>>>
>>>> #include "llvm/Target/TargetMachine.h"
>>>> +
>>>> +#include "llvm/Analysis/Passes.h"
>>>> #include "llvm/CodeGen/AsmPrinter.h"
>>>> +#include "llvm/CodeGen/JumpInstrTables.h"
>>>> #include "llvm/CodeGen/MachineFunctionAnalysis.h"
>>>> #include "llvm/CodeGen/MachineModuleInfo.h"
>>>> #include "llvm/CodeGen/Passes.h"
>>>> #include "llvm/IR/IRPrintingPasses.h"
>>>> +#include "llvm/IR/Verifier.h"
>>>> #include "llvm/MC/MCAsmInfo.h"
>>>> #include "llvm/MC/MCContext.h"
>>>> #include "llvm/MC/MCInstrInfo.h"
>>>> @@ -82,6 +86,7 @@ static MCContext *addPassesToGenerateCod
>>>>                                           bool DisableVerify,
>>>>                                           AnalysisID StartAfter,
>>>>                                           AnalysisID StopAfter) {
>>>> +
>>>>   // Add internal analysis passes from the target machine.
>>>>   TM->addAnalysisPasses(PM);
>>>>
>>>> @@ -136,6 +141,11 @@ bool LLVMTargetMachine::addPassesToEmitF
>>>>                                             bool DisableVerify,
>>>>                                             AnalysisID StartAfter,
>>>>                                             AnalysisID StopAfter) {
>>>> +  // Passes to handle jumptable function annotations. These can't be handled at
>>>> +  // JIT time, so we don't add them directly to addPassesToGenerateCode.
>>>> +  PM.add(createJumpInstrTableInfoPass());
>>>> +  PM.add(createJumpInstrTablesPass(Options.JTType));
>>>> +
>>>>   // Add common CodeGen passes.
>>>>   MCContext *Context = addPassesToGenerateCode(this, PM, DisableVerify,
>>>>                                                StartAfter, StopAfter);
>>>>
>>>> Modified: llvm/trunk/lib/IR/Attributes.cpp
>>>> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/IR/Attributes.cpp?rev=210280&r1=210279&r2=210280&view=diff
>>>> ==============================================================================
>>>> --- llvm/trunk/lib/IR/Attributes.cpp (original)
>>>> +++ llvm/trunk/lib/IR/Attributes.cpp Thu Jun  5 14:29:43 2014
>>>> @@ -173,6 +173,8 @@ std::string Attribute::getAsString(bool
>>>>     return "inlinehint";
>>>>   if (hasAttribute(Attribute::InReg))
>>>>     return "inreg";
>>>> +  if (hasAttribute(Attribute::JumpTable))
>>>> +    return "jumptable";
>>>>   if (hasAttribute(Attribute::MinSize))
>>>>     return "minsize";
>>>>   if (hasAttribute(Attribute::Naked))
>>>> @@ -395,6 +397,7 @@ uint64_t AttributeImpl::getAttrMask(Attr
>>>>   case Attribute::OptimizeNone:    return 1ULL << 42;
>>>>   case Attribute::InAlloca:        return 1ULL << 43;
>>>>   case Attribute::NonNull:         return 1ULL << 44;
>>>> +  case Attribute::JumpTable:       return 1ULL << 45;
>>>>   }
>>>>   llvm_unreachable("Unsupported attribute type");
>>>> }
>>>>
>>>> Modified: llvm/trunk/lib/IR/Verifier.cpp
>>>> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/IR/Verifier.cpp?rev=210280&r1=210279&r2=210280&view=diff
>>>> ==============================================================================
>>>> --- llvm/trunk/lib/IR/Verifier.cpp (original)
>>>> +++ llvm/trunk/lib/IR/Verifier.cpp Thu Jun  5 14:29:43 2014
>>>> @@ -735,7 +735,8 @@ void Verifier::VerifyAttributeTypes(Attr
>>>>         I->getKindAsEnum() == Attribute::Builtin ||
>>>>         I->getKindAsEnum() == Attribute::NoBuiltin ||
>>>>         I->getKindAsEnum() == Attribute::Cold ||
>>>> -        I->getKindAsEnum() == Attribute::OptimizeNone) {
>>>> +        I->getKindAsEnum() == Attribute::OptimizeNone ||
>>>> +        I->getKindAsEnum() == Attribute::JumpTable) {
>>>>       if (!isFunction) {
>>>>         CheckFailed("Attribute '" + I->getAsString() +
>>>>                     "' only applies to functions!", V);
>>>> @@ -909,6 +910,14 @@ void Verifier::VerifyFunctionAttrs(Funct
>>>>                                 Attribute::MinSize),
>>>>             "Attributes 'minsize and optnone' are incompatible!", V);
>>>>   }
>>>> +
>>>> +  if (Attrs.hasAttribute(AttributeSet::FunctionIndex,
>>>> +                         Attribute::JumpTable)) {
>>>> +    const GlobalValue *GV = cast<GlobalValue>(V);
>>>> +    Assert1(GV->hasUnnamedAddr(),
>>>> +            "Attribute 'jumptable' requires 'unnamed_addr'", V);
>>>> +
>>>> +  }
>>>> }
>>>>
>>>> void Verifier::VerifyBitcastType(const Value *V, Type *DestTy, Type *SrcTy) {
>>>>
>>>> Modified: llvm/trunk/lib/LTO/LTOCodeGenerator.cpp
>>>> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/LTO/LTOCodeGenerator.cpp?rev=210280&r1=210279&r2=210280&view=diff
>>>> ==============================================================================
>>>> --- llvm/trunk/lib/LTO/LTOCodeGenerator.cpp (original)
>>>> +++ llvm/trunk/lib/LTO/LTOCodeGenerator.cpp Thu Jun  5 14:29:43 2014
>>>> @@ -96,6 +96,7 @@ void LTOCodeGenerator::initializeLTOPass
>>>>   initializeConstantMergePass(R);
>>>>   initializeDAHPass(R);
>>>>   initializeInstCombinerPass(R);
>>>> +  initializeJumpInstrTablesPass(R);
>>>>   initializeSimpleInlinerPass(R);
>>>>   initializePruneEHPass(R);
>>>>   initializeGlobalDCEPass(R);
>>>>
>>>> Modified: llvm/trunk/lib/Target/ARM/ARMBaseInstrInfo.cpp
>>>> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/ARM/ARMBaseInstrInfo.cpp?rev=210280&r1=210279&r2=210280&view=diff
>>>> ==============================================================================
>>>> --- llvm/trunk/lib/Target/ARM/ARMBaseInstrInfo.cpp (original)
>>>> +++ llvm/trunk/lib/Target/ARM/ARMBaseInstrInfo.cpp Thu Jun  5 14:29:43 2014
>>>> @@ -32,6 +32,7 @@
>>>> #include "llvm/IR/Function.h"
>>>> #include "llvm/IR/GlobalValue.h"
>>>> #include "llvm/MC/MCAsmInfo.h"
>>>> +#include "llvm/MC/MCExpr.h"
>>>> #include "llvm/Support/BranchProbability.h"
>>>> #include "llvm/Support/CommandLine.h"
>>>> #include "llvm/Support/Debug.h"
>>>> @@ -4358,6 +4359,29 @@ breakPartialRegDependency(MachineBasicBl
>>>>   MI->addRegisterKilled(DReg, TRI, true);
>>>> }
>>>>
>>>> +void ARMBaseInstrInfo::getUnconditionalBranch(
>>>> +    MCInst &Branch, const MCSymbolRefExpr *BranchTarget) const {
>>>> +  if (Subtarget.isThumb())
>>>> +    Branch.setOpcode(ARM::tB);
>>>> +  else if (Subtarget.isThumb2())
>>>> +    Branch.setOpcode(ARM::t2B);
>>>> +  else
>>>> +    Branch.setOpcode(ARM::Bcc);
>>>> +
>>>> +  Branch.addOperand(MCOperand::CreateExpr(BranchTarget));
>>>> +  Branch.addOperand(MCOperand::CreateImm(ARMCC::AL));
>>>> +  Branch.addOperand(MCOperand::CreateReg(0));
>>>> +}
>>>> +
>>>> +void ARMBaseInstrInfo::getTrap(MCInst &MI) const {
>>>> +  if (Subtarget.isThumb())
>>>> +    MI.setOpcode(ARM::tTRAP);
>>>> +  else if (Subtarget.useNaClTrap())
>>>> +    MI.setOpcode(ARM::TRAPNaCl);
>>>> +  else
>>>> +    MI.setOpcode(ARM::TRAP);
>>>> +}
>>>> +
>>>> bool ARMBaseInstrInfo::hasNOP() const {
>>>>   return (Subtarget.getFeatureBits() & ARM::HasV6T2Ops) != 0;
>>>> }
>>>>
>>>> Modified: llvm/trunk/lib/Target/ARM/ARMBaseInstrInfo.h
>>>> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/ARM/ARMBaseInstrInfo.h?rev=210280&r1=210279&r2=210280&view=diff
>>>> ==============================================================================
>>>> --- llvm/trunk/lib/Target/ARM/ARMBaseInstrInfo.h (original)
>>>> +++ llvm/trunk/lib/Target/ARM/ARMBaseInstrInfo.h Thu Jun  5 14:29:43 2014
>>>> @@ -229,6 +229,13 @@ public:
>>>>                                       const TargetRegisterInfo*) const override;
>>>>   void breakPartialRegDependency(MachineBasicBlock::iterator, unsigned,
>>>>                                  const TargetRegisterInfo *TRI) const override;
>>>> +
>>>> +  void
>>>> +  getUnconditionalBranch(MCInst &Branch,
>>>> +                         const MCSymbolRefExpr *BranchTarget) const override;
>>>> +
>>>> +  void getTrap(MCInst &MI) const override;
>>>> +
>>>>   /// Get the number of addresses by LDM or VLDM or zero for unknown.
>>>>   unsigned getNumLDMAddresses(const MachineInstr *MI) const;
>>>>
>>>>
>>>> Modified: llvm/trunk/lib/Target/X86/X86InstrInfo.cpp
>>>> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/X86/X86InstrInfo.cpp?rev=210280&r1=210279&r2=210280&view=diff
>>>> ==============================================================================
>>>> --- llvm/trunk/lib/Target/X86/X86InstrInfo.cpp (original)
>>>> +++ llvm/trunk/lib/Target/X86/X86InstrInfo.cpp Thu Jun  5 14:29:43 2014
>>>> @@ -28,6 +28,7 @@
>>>> #include "llvm/IR/DerivedTypes.h"
>>>> #include "llvm/IR/LLVMContext.h"
>>>> #include "llvm/MC/MCAsmInfo.h"
>>>> +#include "llvm/MC/MCExpr.h"
>>>> #include "llvm/MC/MCInst.h"
>>>> #include "llvm/Support/CommandLine.h"
>>>> #include "llvm/Support/Debug.h"
>>>> @@ -5299,6 +5300,16 @@ void X86InstrInfo::getNoopForMachoTarget
>>>>   NopInst.setOpcode(X86::NOOP);
>>>> }
>>>>
>>>> +void X86InstrInfo::getUnconditionalBranch(
>>>> +    MCInst &Branch, const MCSymbolRefExpr *BranchTarget) const {
>>>> +  Branch.setOpcode(X86::JMP_4);
>>>> +  Branch.addOperand(MCOperand::CreateExpr(BranchTarget));
>>>> +}
>>>> +
>>>> +void X86InstrInfo::getTrap(MCInst &MI) const {
>>>> +  MI.setOpcode(X86::TRAP);
>>>> +}
>>>> +
>>>> bool X86InstrInfo::isHighLatencyDef(int opc) const {
>>>>   switch (opc) {
>>>>   default: return false;
>>>>
>>>> Modified: llvm/trunk/lib/Target/X86/X86InstrInfo.h
>>>> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/X86/X86InstrInfo.h?rev=210280&r1=210279&r2=210280&view=diff
>>>> ==============================================================================
>>>> --- llvm/trunk/lib/Target/X86/X86InstrInfo.h (original)
>>>> +++ llvm/trunk/lib/Target/X86/X86InstrInfo.h Thu Jun  5 14:29:43 2014
>>>> @@ -396,6 +396,12 @@ public:
>>>>                                       const SmallVectorImpl<MachineOperand> &MOs,
>>>>                                       unsigned Size, unsigned Alignment) const;
>>>>
>>>> +  void
>>>> +  getUnconditionalBranch(MCInst &Branch,
>>>> +                         const MCSymbolRefExpr *BranchTarget) const override;
>>>> +
>>>> +  void getTrap(MCInst &MI) const override;
>>>> +
>>>>   bool isHighLatencyDef(int opc) const override;
>>>>
>>>>   bool hasHighOperandLatency(const InstrItineraryData *ItinData,
>>>>
>>>> Modified: llvm/trunk/lib/Transforms/IPO/IPO.cpp
>>>> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Transforms/IPO/IPO.cpp?rev=210280&r1=210279&r2=210280&view=diff
>>>> ==============================================================================
>>>> --- llvm/trunk/lib/Transforms/IPO/IPO.cpp (original)
>>>> +++ llvm/trunk/lib/Transforms/IPO/IPO.cpp Thu Jun  5 14:29:43 2014
>>>> @@ -30,6 +30,7 @@ void llvm::initializeIPO(PassRegistry &R
>>>>   initializeGlobalDCEPass(Registry);
>>>>   initializeGlobalOptPass(Registry);
>>>>   initializeIPCPPass(Registry);
>>>> +  initializeJumpInstrTablesPass(Registry);
>>>>   initializeAlwaysInlinerPass(Registry);
>>>>   initializeSimpleInlinerPass(Registry);
>>>>   initializeInternalizePassPass(Registry);
>>>>
>>>> Modified: llvm/trunk/test/Bitcode/attributes.ll
>>>> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/Bitcode/attributes.ll?rev=210280&r1=210279&r2=210280&view=diff
>>>> ==============================================================================
>>>> --- llvm/trunk/test/Bitcode/attributes.ll (original)
>>>> +++ llvm/trunk/test/Bitcode/attributes.ll Thu Jun  5 14:29:43 2014
>>>> @@ -203,7 +203,7 @@ define void @f34()
>>>> ; CHECK: define void @f34()
>>>> {
>>>>         call void @nobuiltin() nobuiltin
>>>> -; CHECK: call void @nobuiltin() #24
>>>> +; CHECK: call void @nobuiltin() #25
>>>>         ret void;
>>>> }
>>>>
>>>> @@ -223,6 +223,12 @@ define nonnull i8* @f37(i8* nonnull %a)
>>>>         ret i8* %a
>>>> }
>>>>
>>>> +define void @f38() unnamed_addr jumptable {
>>>> +; CHECK: define void @f38() unnamed_addr #24
>>>> +    call void bitcast (void (i8*)* @f36 to void ()*)()
>>>> +    unreachable
>>>> +}
>>>> +
>>>> ; CHECK: attributes #0 = { noreturn }
>>>> ; CHECK: attributes #1 = { nounwind }
>>>> ; CHECK: attributes #2 = { readnone }
>>>> @@ -247,5 +253,5 @@ define nonnull i8* @f37(i8* nonnull %a)
>>>> ; CHECK: attributes #21 = { sspstrong }
>>>> ; CHECK: attributes #22 = { minsize }
>>>> ; CHECK: attributes #23 = { noinline optnone }
>>>> -; CHECK: attributes #24 = { nobuiltin }
>>>> -
>>>> +; CHECK: attributes #24 = { jumptable }
>>>> +; CHECK: attributes #25 = { nobuiltin }
>>>>
>>>> Added: llvm/trunk/test/CodeGen/ARM/jump_tables.ll
>>>> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/CodeGen/ARM/jump_tables.ll?rev=210280&view=auto
>>>> ==============================================================================
>>>> --- llvm/trunk/test/CodeGen/ARM/jump_tables.ll (added)
>>>> +++ llvm/trunk/test/CodeGen/ARM/jump_tables.ll Thu Jun  5 14:29:43 2014
>>>> @@ -0,0 +1,32 @@
>>>> +; RUN: llc <%s -march=arm -jump-table-type=single | FileCheck --check-prefix=ARM %s
>>>> +; RUN: llc <%s -march=thumb -jump-table-type=single | FileCheck --check-prefix=THUMB %s
>>>> +
>>>> +define void @indirect_fun() unnamed_addr jumptable {
>>>> +  ret void
>>>> +}
>>>> +define void ()* @get_fun() {
>>>> +  ret void ()* @indirect_fun
>>>> +
>>>> +; ARM:         ldr     r0, [[LABEL:.*]]
>>>> +; ARM:         mov     pc, lr
>>>> +; ARM: [[LABEL]]:
>>>> +; ARM:         .long   __llvm_jump_instr_table_0_1
>>>> +
>>>> +; THUMB:         ldr     r0, [[LABEL:.*]]
>>>> +; THUMB:         bx      lr
>>>> +; THUMB: [[LABEL]]:
>>>> +; THUMB:         .long   __llvm_jump_instr_table_0_1
>>>> +}
>>>> +
>>>> +; ARM:         .globl  __llvm_jump_instr_table_0_1
>>>> +; ARM:         .align  3
>>>> +; ARM:         .type   __llvm_jump_instr_table_0_1,%function
>>>> +; ARM: __llvm_jump_instr_table_0_1:
>>>> +; ARM:         b     indirect_fun(PLT)
>>>> +
>>>> +; THUMB:         .globl  __llvm_jump_instr_table_0_1
>>>> +; THUMB:         .align  3
>>>> +; THUMB:         .thumb_func
>>>> +; THUMB:         .type   __llvm_jump_instr_table_0_1,%function
>>>> +; THUMB: __llvm_jump_instr_table_0_1:
>>>> +; THUMB:         b     indirect_fun(PLT)
>>>>
>>>> Modified: llvm/trunk/test/CodeGen/Generic/stop-after.ll
>>>> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/CodeGen/Generic/stop-after.ll?rev=210280&r1=210279&r2=210280&view=diff
>>>> ==============================================================================
>>>> --- llvm/trunk/test/CodeGen/Generic/stop-after.ll (original)
>>>> +++ llvm/trunk/test/CodeGen/Generic/stop-after.ll Thu Jun  5 14:29:43 2014
>>>> @@ -5,6 +5,6 @@
>>>> ; STOP: Loop Strength Reduction
>>>> ; STOP-NEXT: Machine Function Analysis
>>>>
>>>> -; START: -machine-branch-prob -gc-lowering
>>>> +; START: -machine-branch-prob -jump-instr-tables -gc-lowering
>>>> ; START: FunctionPass Manager
>>>> ; START-NEXT: Lower Garbage Collection Instructions
>>>>
>>>> Added: llvm/trunk/test/CodeGen/X86/jump_table_alias.ll
>>>> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/CodeGen/X86/jump_table_alias.ll?rev=210280&view=auto
>>>> ==============================================================================
>>>> --- llvm/trunk/test/CodeGen/X86/jump_table_alias.ll (added)
>>>> +++ llvm/trunk/test/CodeGen/X86/jump_table_alias.ll Thu Jun  5 14:29:43 2014
>>>> @@ -0,0 +1,33 @@
>>>> +; RUN: llc <%s -jump-table-type=single | FileCheck %s
>>>> +target triple = "x86_64-unknown-linux-gnu"
>>>> +define i32 @f() unnamed_addr jumptable {
>>>> +entry:
>>>> +  ret i32 0
>>>> +}
>>>> +
>>>> + at i = alias internal i32 ()* @f
>>>> + at j = alias i32 ()* @f
>>>> +
>>>> +define i32 @main(i32 %argc, i8** %argv) {
>>>> +  %temp = alloca i32 ()*, align 8
>>>> +  store i32 ()* @i, i32()** %temp, align 8
>>>> +; CHECK: movq    $__llvm_jump_instr_table_0_1
>>>> +  %1 = load i32 ()** %temp, align 8
>>>> +; CHECK: movl    $__llvm_jump_instr_table_0_1
>>>> +  %2 = call i32 ()* %1()
>>>> +  %3 = call i32 ()* @i()
>>>> +; CHECK: callq   i
>>>> +  %4 = call i32 ()* @j()
>>>> +; CHECK: callq   j
>>>> +  ret i32 %3
>>>> +}
>>>> +
>>>> +; There should only be one table, even though there are two GlobalAliases,
>>>> +; because they both alias the same value.
>>>> +
>>>> +; CHECK:         .globl  __llvm_jump_instr_table_0_1
>>>> +; CHECK:         .align  8, 0x90
>>>> +; CHECK:         .type   __llvm_jump_instr_table_0_1, at function
>>>> +; CHECK: __llvm_jump_instr_table_0_1:
>>>> +; CHECK:         jmp     f at PLT
>>>> +
>>>>
>>>> Added: llvm/trunk/test/CodeGen/X86/jump_table_bitcast.ll
>>>> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/CodeGen/X86/jump_table_bitcast.ll?rev=210280&view=auto
>>>> ==============================================================================
>>>> --- llvm/trunk/test/CodeGen/X86/jump_table_bitcast.ll (added)
>>>> +++ llvm/trunk/test/CodeGen/X86/jump_table_bitcast.ll Thu Jun  5 14:29:43 2014
>>>> @@ -0,0 +1,46 @@
>>>> +; RUN: llc <%s -jump-table-type=single | FileCheck %s
>>>> +target triple = "x86_64-unknown-linux-gnu"
>>>> +define i32 @f() unnamed_addr jumptable {
>>>> +  ret i32 0
>>>> +}
>>>> +
>>>> +define i32 @g(i8* %a) unnamed_addr jumptable {
>>>> +  ret i32 0
>>>> +}
>>>> +
>>>> +define void @h(void ()* %func) unnamed_addr jumptable {
>>>> +  ret void
>>>> +}
>>>> +
>>>> +define i32 @main() {
>>>> +  %g = alloca i32 (...)*, align 8
>>>> +  store i32 (...)* bitcast (i32 ()* @f to i32 (...)*), i32 (...)** %g, align 8
>>>> +; CHECK: movq    $__llvm_jump_instr_table_0_[[ENTRY:1|2|3]], (%rsp)
>>>> +; CHECK: movl    $__llvm_jump_instr_table_0_[[ENTRY]], %ecx
>>>> +  %1 = load i32 (...)** %g, align 8
>>>> +  %call = call i32 (...)* %1()
>>>> +  call void (void ()*)* @h(void ()* bitcast (void (void ()*)* @h to void ()*))
>>>> +; CHECK: movl    $__llvm_jump_instr_table_0_{{1|2|3}}, %edi
>>>> +; CHECK: callq   h
>>>> +
>>>> +  %a = call i32 (i32*)* bitcast (i32 (i8*)* @g to i32(i32*)*)(i32* null)
>>>> +; CHECK: callq g
>>>> +  ret i32 %a
>>>> +}
>>>> +
>>>> +; CHECK:         .globl  __llvm_jump_instr_table_0_1
>>>> +; CHECK:         .align  8, 0x90
>>>> +; CHECK:         .type   __llvm_jump_instr_table_0_1, at function
>>>> +; CHECK: __llvm_jump_instr_table_0_1:
>>>> +; CHECK:         jmp     {{f|g|h}}@PLT
>>>> +; CHECK:         .globl  __llvm_jump_instr_table_0_2
>>>> +; CHECK:         .align  8, 0x90
>>>> +; CHECK:         .type   __llvm_jump_instr_table_0_2, at function
>>>> +; CHECK: __llvm_jump_instr_table_0_2:
>>>> +; CHECK:         jmp     {{f|g|h}}@PLT
>>>> +; CHECK:         .globl  __llvm_jump_instr_table_0_3
>>>> +; CHECK:         .align  8, 0x90
>>>> +; CHECK:         .type   __llvm_jump_instr_table_0_3, at function
>>>> +; CHECK: __llvm_jump_instr_table_0_3:
>>>> +; CHECK:         jmp     {{f|g|h}}@PLT
>>>> +
>>>>
>>>> Added: llvm/trunk/test/CodeGen/X86/jump_tables.ll
>>>> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/CodeGen/X86/jump_tables.ll?rev=210280&view=auto
>>>> ==============================================================================
>>>> --- llvm/trunk/test/CodeGen/X86/jump_tables.ll (added)
>>>> +++ llvm/trunk/test/CodeGen/X86/jump_tables.ll Thu Jun  5 14:29:43 2014
>>>> @@ -0,0 +1,272 @@
>>>> +; RUN: llc <%s -jump-table-type=single | FileCheck --check-prefix=SINGLE %s
>>>> +; RUN: llc <%s -jump-table-type=arity | FileCheck --check-prefix=ARITY %s
>>>> +; RUN: llc <%s -jump-table-type=simplified | FileCheck --check-prefix=SIMPL %s
>>>> +; RUN: llc <%s -jump-table-type=full | FileCheck --check-prefix=FULL %s
>>>> +
>>>> +target triple = "x86_64-unknown-linux-gnu"
>>>> +
>>>> +%struct.fun_struct = type { i32 (...)* }
>>>> +
>>>> +define void @indirect_fun() unnamed_addr jumptable {
>>>> +  ret void
>>>> +}
>>>> +
>>>> +define void @indirect_fun_match() unnamed_addr jumptable {
>>>> +  ret void
>>>> +}
>>>> +
>>>> +define i32 @indirect_fun_i32() unnamed_addr jumptable {
>>>> +  ret i32 0
>>>> +}
>>>> +
>>>> +define i32 @indirect_fun_i32_1(i32 %a) unnamed_addr jumptable {
>>>> +  ret i32 %a
>>>> +}
>>>> +
>>>> +define i32 @indirect_fun_i32_2(i32 %a, i32 %b) unnamed_addr jumptable {
>>>> +  ret i32 %a
>>>> +}
>>>> +
>>>> +define i32* @indirect_fun_i32S_2(i32* %a, i32 %b) unnamed_addr jumptable {
>>>> +  ret i32* %a
>>>> +}
>>>> +
>>>> +define void @indirect_fun_struct(%struct.fun_struct %fs) unnamed_addr jumptable {
>>>> +  ret void
>>>> +}
>>>> +
>>>> +define void @indirect_fun_fun(i32 (...)* %fun, i32 %a) unnamed_addr jumptable {
>>>> +  ret void
>>>> +}
>>>> +
>>>> +define i32 @indirect_fun_fun_ret(i32 (...)* %fun, i32 %a) unnamed_addr jumptable {
>>>> +  ret i32 %a
>>>> +}
>>>> +
>>>> +define void @indirect_fun_array([19 x i8] %a) unnamed_addr jumptable {
>>>> +  ret void
>>>> +}
>>>> +
>>>> +define void @indirect_fun_vec(<3 x i32> %a) unnamed_addr jumptable {
>>>> +  ret void
>>>> +}
>>>> +
>>>> +define void @indirect_fun_vec_2(<4 x float> %a) unnamed_addr jumptable {
>>>> +  ret void
>>>> +}
>>>> +
>>>> +define i32 @m(void ()* %fun) {
>>>> +  call void ()* %fun()
>>>> +  ret i32 0
>>>> +}
>>>> +
>>>> +define void ()* @get_fun() {
>>>> +  ret void ()* @indirect_fun
>>>> +; SINGLE: movl    $__llvm_jump_instr_table_0_
>>>> +; ARITY: movl    $__llvm_jump_instr_table_
>>>> +; SIMPL: movl    $__llvm_jump_instr_table_
>>>> +; FULL: movl    $__llvm_jump_instr_table_
>>>> +}
>>>> +
>>>> +define i32 @main(i32 %argc, i8** %argv) {
>>>> +  %f = call void ()* ()* @get_fun()
>>>> +  %a = call i32 @m(void ()* %f)
>>>> +  ret i32 %a
>>>> +}
>>>> +
>>>> +; SINGLE-DAG:         .globl  __llvm_jump_instr_table_0_1
>>>> +; SINGLE-DAG:         .align  8, 0x90
>>>> +; SINGLE-DAG:         .type   __llvm_jump_instr_table_0_1, at function
>>>> +; SINGLE-DAG: __llvm_jump_instr_table_0_1:
>>>> +; SINGLE-DAG:         jmp     indirect_fun_array at PLT
>>>> +; SINGLE-DAG:         .globl  __llvm_jump_instr_table_0_2
>>>> +; SINGLE-DAG:         .align  8, 0x90
>>>> +; SINGLE-DAG:         .type   __llvm_jump_instr_table_0_2, at function
>>>> +; SINGLE-DAG: __llvm_jump_instr_table_0_2:
>>>> +; SINGLE-DAG:         jmp     indirect_fun_i32_2 at PLT
>>>> +; SINGLE-DAG:         .globl  __llvm_jump_instr_table_0_3
>>>> +; SINGLE-DAG:         .align  8, 0x90
>>>> +; SINGLE-DAG:         .type   __llvm_jump_instr_table_0_3, at function
>>>> +; SINGLE-DAG: __llvm_jump_instr_table_0_3:
>>>> +; SINGLE-DAG:         jmp     indirect_fun_vec_2 at PLT
>>>> +; SINGLE-DAG:         .globl  __llvm_jump_instr_table_0_4
>>>> +; SINGLE-DAG:         .align  8, 0x90
>>>> +; SINGLE-DAG:         .type   __llvm_jump_instr_table_0_4, at function
>>>> +; SINGLE-DAG: __llvm_jump_instr_table_0_4:
>>>> +; SINGLE-DAG:         jmp     indirect_fun_i32S_2 at PLT
>>>> +; SINGLE-DAG:         .globl  __llvm_jump_instr_table_0_5
>>>> +; SINGLE-DAG:         .align  8, 0x90
>>>> +; SINGLE-DAG:         .type   __llvm_jump_instr_table_0_5, at function
>>>> +; SINGLE-DAG: __llvm_jump_instr_table_0_5:
>>>> +; SINGLE-DAG:         jmp     indirect_fun_struct at PLT
>>>> +; SINGLE-DAG:         .globl  __llvm_jump_instr_table_0_6
>>>> +; SINGLE-DAG:         .align  8, 0x90
>>>> +; SINGLE-DAG:         .type   __llvm_jump_instr_table_0_6, at function
>>>> +; SINGLE-DAG: __llvm_jump_instr_table_0_6:
>>>> +; SINGLE-DAG:         jmp     indirect_fun_i32_1 at PLT
>>>> +; SINGLE-DAG:         .globl  __llvm_jump_instr_table_0_7
>>>> +; SINGLE-DAG:         .align  8, 0x90
>>>> +; SINGLE-DAG:         .type   __llvm_jump_instr_table_0_7, at function
>>>> +; SINGLE-DAG: __llvm_jump_instr_table_0_7:
>>>> +; SINGLE-DAG:         jmp     indirect_fun_i32 at PLT
>>>> +; SINGLE-DAG:         .globl  __llvm_jump_instr_table_0_8
>>>> +; SINGLE-DAG:         .align  8, 0x90
>>>> +; SINGLE-DAG:         .type   __llvm_jump_instr_table_0_8, at function
>>>> +; SINGLE-DAG: __llvm_jump_instr_table_0_8:
>>>> +; SINGLE-DAG:         jmp     indirect_fun_fun at PLT
>>>> +; SINGLE-DAG:         .globl  __llvm_jump_instr_table_0_9
>>>> +; SINGLE-DAG:         .align  8, 0x90
>>>> +; SINGLE-DAG:         .type   __llvm_jump_instr_table_0_9, at function
>>>> +; SINGLE-DAG: __llvm_jump_instr_table_0_9:
>>>> +; SINGLE-DAG:         jmp     indirect_fun_fun_ret at PLT
>>>> +; SINGLE-DAG:         .globl  __llvm_jump_instr_table_0_10
>>>> +; SINGLE-DAG:         .align  8, 0x90
>>>> +; SINGLE-DAG:         .type   __llvm_jump_instr_table_0_10, at function
>>>> +; SINGLE-DAG: __llvm_jump_instr_table_0_10:
>>>> +; SINGLE-DAG:         jmp     indirect_fun at PLT
>>>> +; SINGLE-DAG:         .globl  __llvm_jump_instr_table_0_11
>>>> +; SINGLE-DAG:         .align  8, 0x90
>>>> +; SINGLE-DAG:         .type   __llvm_jump_instr_table_0_11, at function
>>>> +; SINGLE-DAG: __llvm_jump_instr_table_0_11:
>>>> +; SINGLE-DAG:         jmp     indirect_fun_match at PLT
>>>> +; SINGLE-DAG:         .globl  __llvm_jump_instr_table_0_12
>>>> +; SINGLE-DAG:         .align  8, 0x90
>>>> +; SINGLE-DAG:         .type   __llvm_jump_instr_table_0_12, at function
>>>> +; SINGLE-DAG: __llvm_jump_instr_table_0_12:
>>>> +; SINGLE-DAG:         jmp     indirect_fun_vec at PLT
>>>> +; SINGLE-DAG:         .align  8, 0x90
>>>> +; SINGLE-DAG:         ud2
>>>> +; SINGLE-DAG:         .align  8, 0x90
>>>> +; SINGLE-DAG:         ud2
>>>> +; SINGLE-DAG:         .align  8, 0x90
>>>> +; SINGLE-DAG:         ud2
>>>> +; SINGLE-DAG:         .align  8, 0x90
>>>> +; SINGLE-DAG:         ud2
>>>> +
>>>> +
>>>> +; ARITY-DAG:         .globl  __llvm_jump_instr_table_2_1
>>>> +; ARITY-DAG:         .align  8, 0x90
>>>> +; ARITY-DAG:         .type   __llvm_jump_instr_table_2_1, at function
>>>> +; ARITY-DAG: __llvm_jump_instr_table_2_1:
>>>> +; ARITY-DAG:         jmp     indirect_fun{{.*}}@PLT
>>>> +; ARITY-DAG:         .align  8, 0x90
>>>> +; ARITY-DAG:         ud2
>>>> +; ARITY-DAG:         .globl  __llvm_jump_instr_table_0_1
>>>> +; ARITY-DAG:         .align  8, 0x90
>>>> +; ARITY-DAG:         .type   __llvm_jump_instr_table_0_1, at function
>>>> +; ARITY-DAG: __llvm_jump_instr_table_0_1:
>>>> +; ARITY-DAG:         jmp     indirect_fun{{.*}}@PLT
>>>> +; ARITY-DAG:         .globl  __llvm_jump_instr_table_1_1
>>>> +; ARITY-DAG:         .align  8, 0x90
>>>> +; ARITY-DAG:         .type   __llvm_jump_instr_table_1_1, at function
>>>> +; ARITY-DAG: __llvm_jump_instr_table_1_1:
>>>> +; ARITY-DAG:         jmp     indirect_fun{{.*}}@PLT
>>>> +
>>>> +; SIMPL-DAG:         .globl  __llvm_jump_instr_table_2_1
>>>> +; SIMPL-DAG:         .align  8, 0x90
>>>> +; SIMPL-DAG:         .type   __llvm_jump_instr_table_2_1, at function
>>>> +; SIMPL-DAG: __llvm_jump_instr_table_2_1:
>>>> +; SIMPL-DAG:         jmp     indirect_fun{{.*}}@PLT
>>>> +; SIMPL-DAG:         .align  8, 0x90
>>>> +; SIMPL-DAG:         ud2
>>>> +; SIMPL-DAG:         .globl  __llvm_jump_instr_table_0_1
>>>> +; SIMPL-DAG:         .align  8, 0x90
>>>> +; SIMPL-DAG:         .type   __llvm_jump_instr_table_0_1, at function
>>>> +; SIMPL-DAG: __llvm_jump_instr_table_0_1:
>>>> +; SIMPL-DAG:         jmp     indirect_fun{{.*}}@PLT
>>>> +; SIMPL-DAG:         .globl  __llvm_jump_instr_table_1_1
>>>> +; SIMPL-DAG:         .align  8, 0x90
>>>> +; SIMPL-DAG:         .type   __llvm_jump_instr_table_1_1, at function
>>>> +; SIMPL-DAG: __llvm_jump_instr_table_1_1:
>>>> +; SIMPL-DAG:         jmp     indirect_fun{{.*}}@PLT
>>>> +; SIMPL-DAG:         .globl  __llvm_jump_instr_table_3_1
>>>> +; SIMPL-DAG:         .align  8, 0x90
>>>> +; SIMPL-DAG:         .type   __llvm_jump_instr_table_3_1, at function
>>>> +; SIMPL-DAG: __llvm_jump_instr_table_3_1:
>>>> +; SIMPL-DAG:         jmp     indirect_fun{{.*}}@PLT
>>>> +; SIMPL-DAG:         .globl  __llvm_jump_instr_table_4_1
>>>> +; SIMPL-DAG:         .align  8, 0x90
>>>> +; SIMPL-DAG:         .type   __llvm_jump_instr_table_4_1, at function
>>>> +; SIMPL-DAG: __llvm_jump_instr_table_4_1:
>>>> +; SIMPL-DAG:         jmp     indirect_fun{{.*}}@PLT
>>>> +
>>>> +
>>>> +; FULL-DAG:        .globl  __llvm_jump_instr_table_10_1
>>>> +; FULL-DAG:        .align  8, 0x90
>>>> +; FULL-DAG:        .type   __llvm_jump_instr_table_10_1, at function
>>>> +; FULL-DAG:__llvm_jump_instr_table_10_1:
>>>> +; FULL-DAG:        jmp     indirect_fun_i32_1 at PLT
>>>> +; FULL-DAG:        .align  8, 0x90
>>>> +; FULL-DAG:        ud2
>>>> +; FULL-DAG:        .globl  __llvm_jump_instr_table_9_1
>>>> +; FULL-DAG:        .align  8, 0x90
>>>> +; FULL-DAG:        .type   __llvm_jump_instr_table_9_1, at function
>>>> +; FULL-DAG:__llvm_jump_instr_table_9_1:
>>>> +; FULL-DAG:        jmp     indirect_fun_i32_2 at PLT
>>>> +; FULL-DAG:        .align  8, 0x90
>>>> +; FULL-DAG:        ud2
>>>> +; FULL-DAG:        .globl  __llvm_jump_instr_table_7_1
>>>> +; FULL-DAG:        .align  8, 0x90
>>>> +; FULL-DAG:        .type   __llvm_jump_instr_table_7_1, at function
>>>> +; FULL-DAG:__llvm_jump_instr_table_7_1:
>>>> +; FULL-DAG:        jmp     indirect_fun_i32S_2 at PLT
>>>> +; FULL-DAG:        .align  8, 0x90
>>>> +; FULL-DAG:        ud2
>>>> +; FULL-DAG:        .globl  __llvm_jump_instr_table_3_1
>>>> +; FULL-DAG:        .align  8, 0x90
>>>> +; FULL-DAG:        .type   __llvm_jump_instr_table_3_1, at function
>>>> +; FULL-DAG:__llvm_jump_instr_table_3_1:
>>>> +; FULL-DAG:        jmp     indirect_fun_vec_2 at PLT
>>>> +; FULL-DAG:        .align  8, 0x90
>>>> +; FULL-DAG:        ud2
>>>> +; FULL-DAG:        .globl  __llvm_jump_instr_table_2_1
>>>> +; FULL-DAG:        .align  8, 0x90
>>>> +; FULL-DAG:        .type   __llvm_jump_instr_table_2_1, at function
>>>> +; FULL-DAG:__llvm_jump_instr_table_2_1:
>>>> +; FULL-DAG:        jmp     indirect_fun at PLT
>>>> +; FULL-DAG:        .align  8, 0x90
>>>> +; FULL-DAG:        ud2
>>>> +; FULL-DAG:        .align  8, 0x90
>>>> +; FULL-DAG:        ud2
>>>> +; FULL-DAG:        .globl  __llvm_jump_instr_table_8_1
>>>> +; FULL-DAG:        .align  8, 0x90
>>>> +; FULL-DAG:        .type   __llvm_jump_instr_table_8_1, at function
>>>> +; FULL-DAG:__llvm_jump_instr_table_8_1:
>>>> +; FULL-DAG:        jmp     indirect_fun_i32 at PLT
>>>> +; FULL-DAG:        .align  8, 0x90
>>>> +; FULL-DAG:        ud2
>>>> +; FULL-DAG:        .globl  __llvm_jump_instr_table_1_1
>>>> +; FULL-DAG:        .align  8, 0x90
>>>> +; FULL-DAG:        .type   __llvm_jump_instr_table_1_1, at function
>>>> +; FULL-DAG:__llvm_jump_instr_table_1_1:
>>>> +; FULL-DAG:        jmp     indirect_fun_array at PLT
>>>> +; FULL-DAG:        .align  8, 0x90
>>>> +; FULL-DAG:        ud2
>>>> +; FULL-DAG:        .globl  __llvm_jump_instr_table_0_1
>>>> +; FULL-DAG:        .align  8, 0x90
>>>> +; FULL-DAG:        .type   __llvm_jump_instr_table_0_1, at function
>>>> +; FULL-DAG:__llvm_jump_instr_table_0_1:
>>>> +; FULL-DAG:        jmp     indirect_fun_vec at PLT
>>>> +; FULL-DAG:        .align  8, 0x90
>>>> +; FULL-DAG:        ud2
>>>> +; FULL-DAG:        .globl  __llvm_jump_instr_table_6_1
>>>> +; FULL-DAG:        .align  8, 0x90
>>>> +; FULL-DAG:        .type   __llvm_jump_instr_table_6_1, at function
>>>> +; FULL-DAG:__llvm_jump_instr_table_6_1:
>>>> +; FULL-DAG:        jmp     indirect_fun_struct at PLT
>>>> +; FULL-DAG:        .align  8, 0x90
>>>> +; FULL-DAG:        ud2
>>>> +; FULL-DAG:        .globl  __llvm_jump_instr_table_5_1
>>>> +; FULL-DAG:        .align  8, 0x90
>>>> +; FULL-DAG:        .type   __llvm_jump_instr_table_5_1, at function
>>>> +; FULL-DAG:__llvm_jump_instr_table_5_1:
>>>> +; FULL-DAG:        jmp     indirect_fun_fun at PLT
>>>> +; FULL-DAG:        .align  8, 0x90
>>>> +; FULL-DAG:        ud2
>>>> +; FULL-DAG:        .globl  __llvm_jump_instr_table_4_1
>>>> +; FULL-DAG:        .align  8, 0x90
>>>> +; FULL-DAG:        .type   __llvm_jump_instr_table_4_1, at function
>>>> +; FULL-DAG:__llvm_jump_instr_table_4_1:
>>>> +; FULL-DAG:        jmp     indirect_fun_fun_ret at PLT
>>>> +; FULL-DAG:        .align  8, 0x90
>>>> +; FULL-DAG:        ud2
>>>>
>>>> Added: llvm/trunk/test/Verifier/jumptable.ll
>>>> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/Verifier/jumptable.ll?rev=210280&view=auto
>>>> ==============================================================================
>>>> --- llvm/trunk/test/Verifier/jumptable.ll (added)
>>>> +++ llvm/trunk/test/Verifier/jumptable.ll Thu Jun  5 14:29:43 2014
>>>> @@ -0,0 +1,9 @@
>>>> +; RUN: not llc <%s 2>&1 | FileCheck %s
>>>> +
>>>> +define i32 @f() jumptable {
>>>> +  ret i32 0
>>>> +}
>>>> +
>>>> +; CHECK: Attribute 'jumptable' requires 'unnamed_addr'
>>>> +; CHECK: i32 ()* @f
>>>> +; CHECK: LLVM ERROR: Broken function found, compilation aborted!
>>>>
>>>>
>>>> _______________________________________________
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>>>
>>>
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