X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=include%2Fllvm%2FCodeGen%2FMachineCodeEmitter.h;h=8fc80adf7fb862ffd7d41137a7139d210242aeb9;hb=1f6efa3996dd1929fbc129203ce5009b620e6969;hp=2c207f22f8568f3232850dcac73546f756bcbbf8;hpb=2a3e08b5961353fa3faeadf81f481ae9f5463427;p=oota-llvm.git

diff --git a/include/llvm/CodeGen/MachineCodeEmitter.h b/include/llvm/CodeGen/MachineCodeEmitter.h
index 2c207f22f85..8fc80adf7fb 100644
--- a/include/llvm/CodeGen/MachineCodeEmitter.h
+++ b/include/llvm/CodeGen/MachineCodeEmitter.h
@@ -18,7 +18,7 @@
 #define LLVM_CODEGEN_MACHINECODEEMITTER_H
 
 #include "llvm/Support/DataTypes.h"
-#include <vector>
+#include "llvm/Support/DebugLoc.h"
 
 namespace llvm {
 
@@ -26,10 +26,12 @@ class MachineBasicBlock;
 class MachineConstantPool;
 class MachineJumpTableInfo;
 class MachineFunction;
+class MachineModuleInfo;
 class MachineRelocation;
 class Value;
 class GlobalValue;
 class Function;
+class MCSymbol;
 
 /// MachineCodeEmitter - This class defines two sorts of methods: those for
 /// emitting the actual bytes of machine code, and those for emitting auxillary
@@ -50,14 +52,13 @@ class MachineCodeEmitter {
 protected:
   /// BufferBegin/BufferEnd - Pointers to the start and end of the memory
   /// allocated for this code buffer.
-  unsigned char *BufferBegin, *BufferEnd;
-  
-  /// CurBufferPtr - Pointer to the next byte of memory to fill when emitting 
+  uint8_t *BufferBegin, *BufferEnd;
+  /// CurBufferPtr - Pointer to the next byte of memory to fill when emitting
   /// code.  This is guranteed to be in the range [BufferBegin,BufferEnd].  If
   /// this pointer is at BufferEnd, it will never move due to code emission, and
   /// all code emission requests will be ignored (this is the buffer overflow
   /// condition).
-  unsigned char *CurBufferPtr;
+  uint8_t *CurBufferPtr;
 
 public:
   virtual ~MachineCodeEmitter() {}
@@ -74,24 +75,11 @@ public:
   /// false.
   ///
   virtual bool finishFunction(MachineFunction &F) = 0;
-  
-  /// startFunctionStub - This callback is invoked when the JIT needs the
-  /// address of a function that has not been code generated yet.  The StubSize
-  /// specifies the total size required by the stub.  Stubs are not allowed to
-  /// have constant pools, the can only use the other emitByte*/emitWord*
-  /// methods.
-  ///
-  virtual void startFunctionStub(unsigned StubSize, unsigned Alignment = 1) = 0;
-
-  /// finishFunctionStub - This callback is invoked to terminate a function
-  /// stub.
-  ///
-  virtual void *finishFunctionStub(const Function *F) = 0;
 
   /// emitByte - This callback is invoked when a byte needs to be written to the
   /// output stream.
   ///
-  void emitByte(unsigned char B) {
+  void emitByte(uint8_t B) {
     if (CurBufferPtr != BufferEnd)
       *CurBufferPtr++ = B;
   }
@@ -99,58 +87,186 @@ public:
   /// 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) {
-    if (CurBufferPtr+4 <= BufferEnd) {
-      *CurBufferPtr++ = (unsigned char)(W >>  0);
-      *CurBufferPtr++ = (unsigned char)(W >>  8);
-      *CurBufferPtr++ = (unsigned char)(W >> 16);
-      *CurBufferPtr++ = (unsigned char)(W >> 24);
+  void emitWordLE(uint32_t W) {
+    if (4 <= BufferEnd-CurBufferPtr) {
+      emitWordLEInto(CurBufferPtr, W);
     } else {
       CurBufferPtr = BufferEnd;
     }
   }
-  
+
+  /// emitWordLEInto - This callback is invoked when a 32-bit word needs to be
+  /// written to an arbitrary buffer in little-endian format.  Buf must have at
+  /// least 4 bytes of available space.
+  ///
+  static void emitWordLEInto(uint8_t *&Buf, uint32_t W) {
+    *Buf++ = (uint8_t)(W >>  0);
+    *Buf++ = (uint8_t)(W >>  8);
+    *Buf++ = (uint8_t)(W >> 16);
+    *Buf++ = (uint8_t)(W >> 24);
+  }
+
   /// 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) {
-    if (CurBufferPtr+4 <= BufferEnd) {
-      *CurBufferPtr++ = (unsigned char)(W >> 24);
-      *CurBufferPtr++ = (unsigned char)(W >> 16);
-      *CurBufferPtr++ = (unsigned char)(W >>  8);
-      *CurBufferPtr++ = (unsigned char)(W >>  0);
+  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 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;
-    // Move the current buffer ptr up to the specified alignment.
-    CurBufferPtr =
-      (unsigned char*)(((intptr_t)CurBufferPtr+Alignment-1) &
-                       ~(intptr_t)(Alignment-1));
-    if (CurBufferPtr > 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 {
+      CurBufferPtr = BufferEnd;
+    }
+  }
+  
+
+  /// emitULEB128Bytes - This callback is invoked when a ULEB128 needs to be
+  /// written to the output stream.
+  void emitULEB128Bytes(uint64_t Value) {
+    do {
+      uint8_t Byte = Value & 0x7f;
+      Value >>= 7;
+      if (Value) Byte |= 0x80;
+      emitByte(Byte);
+    } while (Value);
+  }
+  
+  /// emitSLEB128Bytes - This callback is invoked when a SLEB128 needs to be
+  /// written to the output stream.
+  void emitSLEB128Bytes(uint64_t Value) {
+    uint64_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 (unsigned i = 0, N = static_cast<unsigned>(String.size());
+         i < N; ++i) {
+      uint8_t C = String[i];
+      emitByte(C);
+    }
+    emitByte(0);
+  }
+  
+  /// emitInt32 - Emit a int32 directive.
+  void emitInt32(int32_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;
   }
   
+  /// processDebugLoc - Records debug location information about a
+  /// MachineInstruction.  This is called before emitting any bytes associated
+  /// with the instruction.  Even if successive instructions have the same debug
+  /// location, this method will be called for each one.
+  virtual void processDebugLoc(DebugLoc DL, bool BeforePrintintInsn) {}
+
+  /// emitLabel - Emits a label
+  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
   /// failure.  Alignment is the alignment in bytes of the buffer desired.
-  void *allocateSpace(intptr_t Size, unsigned Alignment) {
+  virtual void *allocateSpace(uintptr_t Size, unsigned Alignment) {
     emitAlignment(Alignment);
-    void *Result = CurBufferPtr;
-    
-    // Allocate the space.
-    CurBufferPtr += Size;
+    void *Result;
     
     // Check for buffer overflow.
-    if (CurBufferPtr >= BufferEnd) {
+    if (Size >= (uintptr_t)(BufferEnd-CurBufferPtr)) {
       CurBufferPtr = BufferEnd;
       Result = 0;
+    } else {
+      // Allocate the space.
+      Result = CurBufferPtr;
+      CurBufferPtr += Size;
     }
+    
     return Result;
   }
 
@@ -162,38 +278,53 @@ public:
   /// getCurrentPCValue - This returns the address that the next emitted byte
   /// will be output to.
   ///
-  virtual intptr_t getCurrentPCValue() const {
-    return (intptr_t)CurBufferPtr;
+  virtual uintptr_t getCurrentPCValue() const {
+    return (uintptr_t)CurBufferPtr;
   }
 
   /// getCurrentPCOffset - Return the offset from the start of the emitted
   /// buffer that we are currently writing to.
-  intptr_t getCurrentPCOffset() const {
+  virtual uintptr_t getCurrentPCOffset() const {
     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.
+  virtual bool earlyResolveAddresses() const = 0;
+
   /// addRelocation - Whenever a relocatable address is needed, it should be
   /// noted with this interface.
   virtual void addRelocation(const MachineRelocation &MR) = 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.
   ///
-  virtual intptr_t getConstantPoolEntryAddress(unsigned Index) const = 0;
+  virtual uintptr_t getConstantPoolEntryAddress(unsigned Index) const = 0;
 
   /// getJumpTableEntryAddress - Return the address of the jump table with index
   /// 'Index' in the function that last called initJumpTableInfo.
   ///
-  virtual intptr_t getJumpTableEntryAddress(unsigned Index) const = 0;
+  virtual uintptr_t getJumpTableEntryAddress(unsigned Index) const = 0;
   
   /// getMachineBasicBlockAddress - Return the address of the specified
   /// MachineBasicBlock, only usable after the label for the MBB has been
   /// emitted.
   ///
-  virtual intptr_t getMachineBasicBlockAddress(MachineBasicBlock *MBB) const= 0;
+  virtual uintptr_t getMachineBasicBlockAddress(MachineBasicBlock *MBB) const= 0;
+
+  /// getLabelAddress - Return the address of the specified Label, only usable
+  /// after the LabelID has been emitted.
+  ///
+  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;
 };
 
 } // End llvm namespace