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//===-- ARMJITInfo.h - ARM implementation of the JIT interface -*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file contains the declaration of the ARMJITInfo class.
//
//===----------------------------------------------------------------------===//
#ifndef ARMJITINFO_H
#define ARMJITINFO_H
#include "ARMMachineFunctionInfo.h"
#include "llvm/CodeGen/MachineConstantPool.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineJumpTableInfo.h"
#include "llvm/Target/TargetJITInfo.h"
#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/SmallVector.h"
namespace llvm {
class ARMTargetMachine;
class ARMJITInfo : public TargetJITInfo {
// ConstPoolId2AddrMap - A map from constant pool ids to the corresponding
// CONSTPOOL_ENTRY addresses.
SmallVector<intptr_t, 16> ConstPoolId2AddrMap;
// JumpTableId2AddrMap - A map from inline jumptable ids to the
// corresponding inline jump table bases.
SmallVector<intptr_t, 16> JumpTableId2AddrMap;
// PCLabelMap - A map from PC labels to addresses.
DenseMap<unsigned, intptr_t> PCLabelMap;
// Sym2IndirectSymMap - A map from symbol (GlobalValue and ExternalSymbol)
// addresses to their indirect symbol addresses.
DenseMap<void*, intptr_t> Sym2IndirectSymMap;
// IsPIC - True if the relocation model is PIC. This is used to determine
// how to codegen function stubs.
bool IsPIC;
public:
explicit ARMJITInfo() : IsPIC(false) { useGOT = false; }
/// replaceMachineCodeForFunction - Make it so that calling the function
/// whose machine code is at OLD turns into a call to NEW, perhaps by
/// overwriting OLD with a branch to NEW. This is used for self-modifying
/// code.
///
virtual void replaceMachineCodeForFunction(void *Old, void *New);
/// emitGlobalValueIndirectSym - Use the specified JITCodeEmitter object
/// to emit an indirect symbol which contains the address of the specified
/// ptr.
virtual void *emitGlobalValueIndirectSym(const GlobalValue* GV, void *ptr,
JITCodeEmitter &JCE);
// getStubLayout - Returns the size and alignment of the largest call stub
// on ARM.
virtual StubLayout getStubLayout();
/// emitFunctionStub - Use the specified JITCodeEmitter object to emit a
/// small native function that simply calls the function at the specified
/// address.
virtual void *emitFunctionStub(const Function* F, void *Fn,
JITCodeEmitter &JCE);
/// getLazyResolverFunction - Expose the lazy resolver to the JIT.
virtual LazyResolverFn getLazyResolverFunction(JITCompilerFn);
/// relocate - Before the JIT can run a block of code that has been emitted,
/// it must rewrite the code to contain the actual addresses of any
/// referenced global symbols.
virtual void relocate(void *Function, MachineRelocation *MR,
unsigned NumRelocs, unsigned char* GOTBase);
/// hasCustomConstantPool - Allows a target to specify that constant
/// pool address resolution is handled by the target.
virtual bool hasCustomConstantPool() const { return true; }
/// hasCustomJumpTables - Allows a target to specify that jumptables
/// are emitted by the target.
virtual bool hasCustomJumpTables() const { return true; }
/// allocateSeparateGVMemory - If true, globals should be placed in
/// separately allocated heap memory rather than in the same
/// code memory allocated by JITCodeEmitter.
virtual bool allocateSeparateGVMemory() const {
#ifdef __APPLE__
return true;
#else
return false;
#endif
}
/// Initialize - Initialize internal stage for the function being JITted.
/// Resize constant pool ids to CONSTPOOL_ENTRY addresses map; resize
/// jump table ids to jump table bases map; remember if codegen relocation
/// model is PIC.
void Initialize(const MachineFunction &MF, bool isPIC) {
const ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
ConstPoolId2AddrMap.resize(AFI->getNumPICLabels());
JumpTableId2AddrMap.resize(AFI->getNumJumpTables());
IsPIC = isPIC;
}
/// getConstantPoolEntryAddr - The ARM target puts all constant
/// pool entries into constant islands. This returns the address of the
/// constant pool entry of the specified index.
intptr_t getConstantPoolEntryAddr(unsigned CPI) const {
assert(CPI < ConstPoolId2AddrMap.size());
return ConstPoolId2AddrMap[CPI];
}
/// addConstantPoolEntryAddr - Map a Constant Pool Index to the address
/// where its associated value is stored. When relocations are processed,
/// this value will be used to resolve references to the constant.
void addConstantPoolEntryAddr(unsigned CPI, intptr_t Addr) {
assert(CPI < ConstPoolId2AddrMap.size());
ConstPoolId2AddrMap[CPI] = Addr;
}
/// getJumpTableBaseAddr - The ARM target inline all jump tables within
/// text section of the function. This returns the address of the base of
/// the jump table of the specified index.
intptr_t getJumpTableBaseAddr(unsigned JTI) const {
assert(JTI < JumpTableId2AddrMap.size());
return JumpTableId2AddrMap[JTI];
}
/// addJumpTableBaseAddr - Map a jump table index to the address where
/// the corresponding inline jump table is emitted. When relocations are
/// processed, this value will be used to resolve references to the
/// jump table.
void addJumpTableBaseAddr(unsigned JTI, intptr_t Addr) {
assert(JTI < JumpTableId2AddrMap.size());
JumpTableId2AddrMap[JTI] = Addr;
}
/// getPCLabelAddr - Retrieve the address of the PC label of the
/// specified id.
intptr_t getPCLabelAddr(unsigned Id) const {
DenseMap<unsigned, intptr_t>::const_iterator I = PCLabelMap.find(Id);
assert(I != PCLabelMap.end());
return I->second;
}
/// addPCLabelAddr - Remember the address of the specified PC label.
void addPCLabelAddr(unsigned Id, intptr_t Addr) {
PCLabelMap.insert(std::make_pair(Id, Addr));
}
/// getIndirectSymAddr - Retrieve the address of the indirect symbol of the
/// specified symbol located at address. Returns 0 if the indirect symbol
/// has not been emitted.
intptr_t getIndirectSymAddr(void *Addr) const {
DenseMap<void*,intptr_t>::const_iterator I= Sym2IndirectSymMap.find(Addr);
if (I != Sym2IndirectSymMap.end())
return I->second;
return 0;
}
/// addIndirectSymAddr - Add a mapping from address of an emitted symbol to
/// its indirect symbol address.
void addIndirectSymAddr(void *SymAddr, intptr_t IndSymAddr) {
Sym2IndirectSymMap.insert(std::make_pair(SymAddr, IndSymAddr));
}
private:
/// resolveRelocDestAddr - Resolve the resulting address of the relocation
/// if it's not already solved. Constantpool entries must be resolved by
/// ARM target.
intptr_t resolveRelocDestAddr(MachineRelocation *MR) const;
};
}
#endif
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