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Diffstat (limited to 'include/llvm/CodeGen/JITCodeEmitter.h')
| -rw-r--r-- | include/llvm/CodeGen/JITCodeEmitter.h | 344 |
1 files changed, 0 insertions, 344 deletions
diff --git a/include/llvm/CodeGen/JITCodeEmitter.h b/include/llvm/CodeGen/JITCodeEmitter.h deleted file mode 100644 index dc2a027..0000000 --- a/include/llvm/CodeGen/JITCodeEmitter.h +++ /dev/null @@ -1,344 +0,0 @@ -//===-- llvm/CodeGen/JITCodeEmitter.h - Code emission ----------*- C++ -*-===// -// -// The LLVM Compiler Infrastructure -// -// This file is distributed under the University of Illinois Open Source -// License. See LICENSE.TXT for details. -// -//===----------------------------------------------------------------------===// -// -// This file defines an abstract interface that is used by the machine code -// emission framework to output the code. This allows machine code emission to -// be separated from concerns such as resolution of call targets, and where the -// machine code will be written (memory or disk, f.e.). -// -//===----------------------------------------------------------------------===// - -#ifndef LLVM_CODEGEN_JITCODEEMITTER_H -#define LLVM_CODEGEN_JITCODEEMITTER_H - -#include "llvm/ADT/DenseMap.h" -#include "llvm/CodeGen/MachineCodeEmitter.h" -#include "llvm/Support/DataTypes.h" -#include "llvm/Support/MathExtras.h" -#include <string> - -namespace llvm { - -class MachineBasicBlock; -class MachineConstantPool; -class MachineJumpTableInfo; -class MachineFunction; -class MachineModuleInfo; -class MachineRelocation; -class Value; -class GlobalValue; -class Function; - -/// JITCodeEmitter - This class defines two sorts of methods: those for -/// emitting the actual bytes of machine code, and those for emitting auxiliary -/// structures, such as jump tables, relocations, etc. -/// -/// Emission of machine code is complicated by the fact that we don't (in -/// general) know the size of the machine code that we're about to emit before -/// we emit it. As such, we preallocate a certain amount of memory, and set the -/// BufferBegin/BufferEnd pointers to the start and end of the buffer. As we -/// emit machine instructions, we advance the CurBufferPtr to indicate the -/// location of the next byte to emit. In the case of a buffer overflow (we -/// need to emit more machine code than we have allocated space for), the -/// CurBufferPtr will saturate to BufferEnd and ignore stores. Once the entire -/// function has been emitted, the overflow condition is checked, and if it has -/// occurred, more memory is allocated, and we reemit the code into it. -/// -class JITCodeEmitter : public MachineCodeEmitter { - void anchor() override; -public: - virtual ~JITCodeEmitter() {} - - /// startFunction - This callback is invoked when the specified function is - /// about to be code generated. This initializes the BufferBegin/End/Ptr - /// fields. - /// - void startFunction(MachineFunction &F) override = 0; - - /// finishFunction - This callback is invoked when the specified function has - /// finished code generation. If a buffer overflow has occurred, this method - /// returns true (the callee is required to try again), otherwise it returns - /// false. - /// - bool finishFunction(MachineFunction &F) override = 0; - - /// allocIndirectGV - Allocates and fills storage for an indirect - /// GlobalValue, and returns the address. - virtual void *allocIndirectGV(const GlobalValue *GV, - const uint8_t *Buffer, size_t Size, - unsigned Alignment) = 0; - - /// emitByte - This callback is invoked when a byte needs to be written to the - /// output stream. - /// - void emitByte(uint8_t B) { - if (CurBufferPtr != BufferEnd) - *CurBufferPtr++ = B; - } - - /// emitWordLE - This callback is invoked when a 32-bit word needs to be - /// written to the output stream in little-endian format. - /// - void emitWordLE(uint32_t W) { - if (4 <= BufferEnd-CurBufferPtr) { - *CurBufferPtr++ = (uint8_t)(W >> 0); - *CurBufferPtr++ = (uint8_t)(W >> 8); - *CurBufferPtr++ = (uint8_t)(W >> 16); - *CurBufferPtr++ = (uint8_t)(W >> 24); - } else { - CurBufferPtr = BufferEnd; - } - } - - /// emitWordBE - This callback is invoked when a 32-bit word needs to be - /// written to the output stream in big-endian format. - /// - void emitWordBE(uint32_t W) { - if (4 <= BufferEnd-CurBufferPtr) { - *CurBufferPtr++ = (uint8_t)(W >> 24); - *CurBufferPtr++ = (uint8_t)(W >> 16); - *CurBufferPtr++ = (uint8_t)(W >> 8); - *CurBufferPtr++ = (uint8_t)(W >> 0); - } else { - CurBufferPtr = BufferEnd; - } - } - - /// emitDWordLE - This callback is invoked when a 64-bit word needs to be - /// written to the output stream in little-endian format. - /// - void emitDWordLE(uint64_t W) { - if (8 <= BufferEnd-CurBufferPtr) { - *CurBufferPtr++ = (uint8_t)(W >> 0); - *CurBufferPtr++ = (uint8_t)(W >> 8); - *CurBufferPtr++ = (uint8_t)(W >> 16); - *CurBufferPtr++ = (uint8_t)(W >> 24); - *CurBufferPtr++ = (uint8_t)(W >> 32); - *CurBufferPtr++ = (uint8_t)(W >> 40); - *CurBufferPtr++ = (uint8_t)(W >> 48); - *CurBufferPtr++ = (uint8_t)(W >> 56); - } else { - CurBufferPtr = BufferEnd; - } - } - - /// emitDWordBE - This callback is invoked when a 64-bit word needs to be - /// written to the output stream in big-endian format. - /// - void emitDWordBE(uint64_t W) { - if (8 <= BufferEnd-CurBufferPtr) { - *CurBufferPtr++ = (uint8_t)(W >> 56); - *CurBufferPtr++ = (uint8_t)(W >> 48); - *CurBufferPtr++ = (uint8_t)(W >> 40); - *CurBufferPtr++ = (uint8_t)(W >> 32); - *CurBufferPtr++ = (uint8_t)(W >> 24); - *CurBufferPtr++ = (uint8_t)(W >> 16); - *CurBufferPtr++ = (uint8_t)(W >> 8); - *CurBufferPtr++ = (uint8_t)(W >> 0); - } else { - CurBufferPtr = BufferEnd; - } - } - - /// emitAlignment - Move the CurBufferPtr pointer up to the specified - /// alignment (saturated to BufferEnd of course). - void emitAlignment(unsigned Alignment) { - if (Alignment == 0) Alignment = 1; - uint8_t *NewPtr = (uint8_t*)RoundUpToAlignment((uintptr_t)CurBufferPtr, - Alignment); - CurBufferPtr = std::min(NewPtr, BufferEnd); - } - - /// emitAlignmentWithFill - Similar to emitAlignment, except that the - /// extra bytes are filled with the provided byte. - void emitAlignmentWithFill(unsigned Alignment, uint8_t Fill) { - if (Alignment == 0) Alignment = 1; - uint8_t *NewPtr = (uint8_t*)RoundUpToAlignment((uintptr_t)CurBufferPtr, - Alignment); - // Fail if we don't have room. - if (NewPtr > BufferEnd) { - CurBufferPtr = BufferEnd; - return; - } - while (CurBufferPtr < NewPtr) { - *CurBufferPtr++ = Fill; - } - } - - /// emitULEB128Bytes - This callback is invoked when a ULEB128 needs to be - /// written to the output stream. - void emitULEB128Bytes(uint64_t Value, unsigned PadTo = 0) { - do { - uint8_t Byte = Value & 0x7f; - Value >>= 7; - if (Value || PadTo != 0) Byte |= 0x80; - emitByte(Byte); - } while (Value); - - if (PadTo) { - do { - uint8_t Byte = (PadTo > 1) ? 0x80 : 0x0; - emitByte(Byte); - } while (--PadTo); - } - } - - /// emitSLEB128Bytes - This callback is invoked when a SLEB128 needs to be - /// written to the output stream. - void emitSLEB128Bytes(int64_t Value) { - int32_t Sign = Value >> (8 * sizeof(Value) - 1); - bool IsMore; - - do { - uint8_t Byte = Value & 0x7f; - Value >>= 7; - IsMore = Value != Sign || ((Byte ^ Sign) & 0x40) != 0; - if (IsMore) Byte |= 0x80; - emitByte(Byte); - } while (IsMore); - } - - /// emitString - This callback is invoked when a String needs to be - /// written to the output stream. - void emitString(const std::string &String) { - for (size_t i = 0, N = String.size(); i < N; ++i) { - uint8_t C = String[i]; - emitByte(C); - } - emitByte(0); - } - - /// emitInt32 - Emit a int32 directive. - void emitInt32(uint32_t Value) { - if (4 <= BufferEnd-CurBufferPtr) { - *((uint32_t*)CurBufferPtr) = Value; - CurBufferPtr += 4; - } else { - CurBufferPtr = BufferEnd; - } - } - - /// emitInt64 - Emit a int64 directive. - void emitInt64(uint64_t Value) { - if (8 <= BufferEnd-CurBufferPtr) { - *((uint64_t*)CurBufferPtr) = Value; - CurBufferPtr += 8; - } else { - CurBufferPtr = BufferEnd; - } - } - - /// emitInt32At - Emit the Int32 Value in Addr. - void emitInt32At(uintptr_t *Addr, uintptr_t Value) { - if (Addr >= (uintptr_t*)BufferBegin && Addr < (uintptr_t*)BufferEnd) - (*(uint32_t*)Addr) = (uint32_t)Value; - } - - /// emitInt64At - Emit the Int64 Value in Addr. - void emitInt64At(uintptr_t *Addr, uintptr_t Value) { - if (Addr >= (uintptr_t*)BufferBegin && Addr < (uintptr_t*)BufferEnd) - (*(uint64_t*)Addr) = (uint64_t)Value; - } - - - /// emitLabel - Emits a label - void emitLabel(MCSymbol *Label) override = 0; - - /// allocateSpace - Allocate a block of space in the current output buffer, - /// returning null (and setting conditions to indicate buffer overflow) on - /// failure. Alignment is the alignment in bytes of the buffer desired. - void *allocateSpace(uintptr_t Size, unsigned Alignment) override { - emitAlignment(Alignment); - void *Result; - - // Check for buffer overflow. - if (Size >= (uintptr_t)(BufferEnd-CurBufferPtr)) { - CurBufferPtr = BufferEnd; - Result = nullptr; - } else { - // Allocate the space. - Result = CurBufferPtr; - CurBufferPtr += Size; - } - - return Result; - } - - /// allocateGlobal - Allocate memory for a global. Unlike allocateSpace, - /// this method does not allocate memory in the current output buffer, - /// because a global may live longer than the current function. - virtual void *allocateGlobal(uintptr_t Size, unsigned Alignment) = 0; - - /// StartMachineBasicBlock - This should be called by the target when a new - /// basic block is about to be emitted. This way the MCE knows where the - /// start of the block is, and can implement getMachineBasicBlockAddress. - void StartMachineBasicBlock(MachineBasicBlock *MBB) override = 0; - - /// getCurrentPCValue - This returns the address that the next emitted byte - /// will be output to. - /// - uintptr_t getCurrentPCValue() const override { - return (uintptr_t)CurBufferPtr; - } - - /// getCurrentPCOffset - Return the offset from the start of the emitted - /// buffer that we are currently writing to. - uintptr_t getCurrentPCOffset() const override { - return CurBufferPtr-BufferBegin; - } - - /// earlyResolveAddresses - True if the code emitter can use symbol addresses - /// during code emission time. The JIT is capable of doing this because it - /// creates jump tables or constant pools in memory on the fly while the - /// object code emitters rely on a linker to have real addresses and should - /// use relocations instead. - bool earlyResolveAddresses() const override { return true; } - - /// addRelocation - Whenever a relocatable address is needed, it should be - /// noted with this interface. - void addRelocation(const MachineRelocation &MR) override = 0; - - /// FIXME: These should all be handled with relocations! - - /// getConstantPoolEntryAddress - Return the address of the 'Index' entry in - /// the constant pool that was last emitted with the emitConstantPool method. - /// - uintptr_t getConstantPoolEntryAddress(unsigned Index) const override = 0; - - /// getJumpTableEntryAddress - Return the address of the jump table with index - /// 'Index' in the function that last called initJumpTableInfo. - /// - uintptr_t getJumpTableEntryAddress(unsigned Index) const override = 0; - - /// getMachineBasicBlockAddress - Return the address of the specified - /// MachineBasicBlock, only usable after the label for the MBB has been - /// emitted. - /// - uintptr_t - getMachineBasicBlockAddress(MachineBasicBlock *MBB) const override = 0; - - /// getLabelAddress - Return the address of the specified Label, only usable - /// after the Label has been emitted. - /// - uintptr_t getLabelAddress(MCSymbol *Label) const override = 0; - - /// Specifies the MachineModuleInfo object. This is used for exception handling - /// purposes. - void setModuleInfo(MachineModuleInfo* Info) override = 0; - - /// getLabelLocations - Return the label locations map of the label IDs to - /// their address. - virtual DenseMap<MCSymbol*, uintptr_t> *getLabelLocations() { - return nullptr; - } -}; - -} // End llvm namespace - -#endif |