#include <string>
#include "llvm/Support/DataTypes.h"
-#include "llvm/Support/Streams.h"
+#include "llvm/Support/MathExtras.h"
#include "llvm/CodeGen/MachineCodeEmitter.h"
-
-using namespace std;
+#include "llvm/ADT/DenseMap.h"
namespace llvm {
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 auxillary
+/// 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
/// occurred, more memory is allocated, and we reemit the code into it.
///
class JITCodeEmitter : public MachineCodeEmitter {
+ virtual void anchor();
public:
virtual ~JITCodeEmitter() {}
///
virtual bool finishFunction(MachineFunction &F) = 0;
- /// startGVStub - This callback is invoked when the JIT needs the
- /// address of a GV (e.g. function) that has not been code generated yet.
- /// The StubSize specifies the total size required by the stub.
- ///
- virtual void startGVStub(const GlobalValue* GV, unsigned StubSize,
- unsigned Alignment = 1) = 0;
-
- /// startGVStub - This callback is invoked when the JIT needs the address of a
- /// GV (e.g. function) that has not been code generated yet. Buffer points to
- /// memory already allocated for this stub.
- ///
- virtual void startGVStub(const GlobalValue* GV, void *Buffer,
- unsigned StubSize) = 0;
-
- /// finishGVStub - This callback is invoked to terminate a GV stub.
- ///
- virtual void *finishGVStub(const GlobalValue* F) = 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.
/// emitWordLE - This callback is invoked when a 32-bit word needs to be
/// written to the output stream in little-endian format.
///
- void emitWordLE(unsigned W) {
+ void emitWordLE(uint32_t W) {
if (4 <= BufferEnd-CurBufferPtr) {
*CurBufferPtr++ = (uint8_t)(W >> 0);
*CurBufferPtr++ = (uint8_t)(W >> 8);
/// emitWordBE - This callback is invoked when a 32-bit word needs to be
/// written to the output stream in big-endian format.
///
- void emitWordBE(unsigned W) {
+ void emitWordBE(uint32_t W) {
if (4 <= BufferEnd-CurBufferPtr) {
*CurBufferPtr++ = (uint8_t)(W >> 24);
*CurBufferPtr++ = (uint8_t)(W >> 16);
}
}
- /// emitAlignment - Move the CurBufferPtr pointer up the the specified
+ /// 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);
+ }
- if(Alignment <= (uintptr_t)(BufferEnd-CurBufferPtr)) {
- // Move the current buffer ptr up to the specified alignment.
- CurBufferPtr =
- (uint8_t*)(((uintptr_t)CurBufferPtr+Alignment-1) &
- ~(uintptr_t)(Alignment-1));
- } else {
+ /// 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(unsigned Value) {
+ void emitULEB128Bytes(uint64_t Value, unsigned PadTo = 0) {
do {
uint8_t Byte = Value & 0x7f;
Value >>= 7;
- if (Value) Byte |= 0x80;
+ 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(int32_t Value) {
+ void emitSLEB128Bytes(int64_t Value) {
int32_t Sign = Value >> (8 * sizeof(Value) - 1);
bool IsMore;
}
/// emitInt32 - Emit a int32 directive.
- void emitInt32(int32_t Value) {
+ void emitInt32(uint32_t Value) {
if (4 <= BufferEnd-CurBufferPtr) {
*((uint32_t*)CurBufferPtr) = Value;
CurBufferPtr += 4;
/// emitLabel - Emits a label
- virtual void emitLabel(uint64_t LabelID) = 0;
+ virtual void emitLabel(MCSymbol *Label) = 0;
/// allocateSpace - Allocate a block of space in the current output buffer,
/// returning null (and setting conditions to indicate buffer overflow) on
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.
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 { return true; }
+
/// addRelocation - Whenever a relocatable address is needed, it should be
/// noted with this interface.
virtual void addRelocation(const MachineRelocation &MR) = 0;
///
virtual uintptr_t getMachineBasicBlockAddress(MachineBasicBlock *MBB) const= 0;
- /// getLabelAddress - Return the address of the specified LabelID, only usable
- /// after the LabelID has been emitted.
+ /// getLabelAddress - Return the address of the specified Label, only usable
+ /// after the Label has been emitted.
///
- virtual uintptr_t getLabelAddress(uint64_t LabelID) const = 0;
+ virtual uintptr_t getLabelAddress(MCSymbol *Label) const = 0;
/// Specifies the MachineModuleInfo object. This is used for exception handling
/// purposes.
virtual void setModuleInfo(MachineModuleInfo* Info) = 0;
+
+ /// getLabelLocations - Return the label locations map of the label IDs to
+ /// their address.
+ virtual DenseMap<MCSymbol*, uintptr_t> *getLabelLocations() { return 0; }
};
} // End llvm namespace
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