Enable exception handling int JIT

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47079 91177308-0d34-0410-b5e6-96231b3b80d8

3 files changed, 105 insertions, 0 deletions

diff --git a/include/llvm/CodeGen/MachineCodeEmitter.h b/include/llvm/CodeGen/MachineCodeEmitter.h
index 2c207f22f8..8fe7ecc9e9 100644
--- a/include/llvm/CodeGen/MachineCodeEmitter.h
+++ b/include/llvm/CodeGen/MachineCodeEmitter.h
@@ -26,6 +26,7 @@ class MachineBasicBlock;
 class MachineConstantPool;
 class MachineJumpTableInfo;
 class MachineFunction;
+class MachineModuleInfo;
 class MachineRelocation;
 class Value;
 class GlobalValue;
@@ -136,6 +137,72 @@ public:
       CurBufferPtr = BufferEnd;
   }
   
+
+  /// emitULEB128Bytes - This callback is invoked when a ULEB128 needs to be
+  /// written to the output stream.
+  void emitULEB128Bytes(unsigned Value) {
+    do {
+      unsigned char 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(int Value) {
+    int Sign = Value >> (8 * sizeof(Value) - 1);
+    bool IsMore;
+  
+    do {
+      unsigned char 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 = String.size(); i < N; ++i) {
+      unsigned char C = String[i];
+      emitByte(C);
+    }
+    emitByte(0);
+  }
+  
+  /// emitInt32 - Emit a int32 directive.
+  void emitInt32(int Value) {
+    if (CurBufferPtr+4 <= BufferEnd) {
+      *((uint32_t*)CurBufferPtr) = Value;
+      CurBufferPtr += 4;
+    } else {
+      CurBufferPtr = BufferEnd;
+    }
+  }
+
+  /// emitInt64 - Emit a int64 directive.
+  void emitInt64(uint64_t Value) {
+    if (CurBufferPtr+8 <= BufferEnd) {
+      *((uint64_t*)CurBufferPtr) = Value;
+      CurBufferPtr += 8;
+    } else {
+      CurBufferPtr = BufferEnd;
+    }
+  }
+  
+  /// emitAt - Emit Value in Addr
+  void emitAt(uintptr_t *Addr, uintptr_t Value) {
+    if (Addr >= (uintptr_t*)BufferBegin && Addr < (uintptr_t*)BufferEnd)
+      (*Addr) = Value;
+  }
+  
+  /// emitLabel - Emits a label
+  virtual void emitLabel(uint64_t LabelID) = 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.
@@ -194,6 +261,15 @@ public:
   /// emitted.
   ///
   virtual intptr_t getMachineBasicBlockAddress(MachineBasicBlock *MBB) const= 0;
+
+  /// getLabelAddress - Return the address of the specified LabelID, only usable
+  /// after the LabelID has been emitted.
+  ///
+  virtual intptr_t getLabelAddress(uint64_t LabelID) const = 0;
+  
+  /// Specifies the MachineModuleInfo object. This is used for exception handling
+  /// purposes.
+  virtual void setModuleInfo(MachineModuleInfo* Info) = 0;
 };
 
 } // End llvm namespace
diff --git a/include/llvm/ExecutionEngine/ExecutionEngine.h b/include/llvm/ExecutionEngine/ExecutionEngine.h
index f2249ec197..461efe3235 100644
--- a/include/llvm/ExecutionEngine/ExecutionEngine.h
+++ b/include/llvm/ExecutionEngine/ExecutionEngine.h
@@ -85,6 +85,11 @@ protected:
   /// pointer is invoked to create it. If this returns null, the JIT will abort.
   void* (*LazyFunctionCreator)(const std::string &);
   
+  /// ExceptionTableRegister - If Exception Handling is set, the JIT will 
+  /// register dwarf tables with this function
+  typedef void (*EERegisterFn)(void*);
+  static EERegisterFn ExceptionTableRegister;
+
 public:
   /// lock - This lock is protects the ExecutionEngine, JIT, JITResolver and
   /// JITEmitter classes.  It must be held while changing the internal state of
@@ -246,6 +251,19 @@ public:
   void InstallLazyFunctionCreator(void* (*P)(const std::string &)) {
     LazyFunctionCreator = P;
   }
+  
+  /// InstallExceptionTableRegister - The JIT will use the given function
+  /// to register the exception tables it generates.
+  static void InstallExceptionTableRegister(void (*F)(void*)) {
+    ExceptionTableRegister = F;
+  }
+  
+  /// RegisterTable - Registers the given pointer as an exception table. It uses
+  /// the ExceptionTableRegister function.
+  static void RegisterTable(void* res) {
+    if (ExceptionTableRegister)
+      ExceptionTableRegister(res);
+  }
 
 protected:
   explicit ExecutionEngine(ModuleProvider *P);
diff --git a/include/llvm/ExecutionEngine/JITMemoryManager.h b/include/llvm/ExecutionEngine/JITMemoryManager.h
index c41be7958a..7226496753 100644
--- a/include/llvm/ExecutionEngine/JITMemoryManager.h
+++ b/include/llvm/ExecutionEngine/JITMemoryManager.h
@@ -89,6 +89,17 @@ public:
   /// deallocateMemForFunction - Free JIT memory for the specified function.
   /// This is never called when the JIT is currently emitting a function.
   virtual void deallocateMemForFunction(const Function *F) = 0;
+  
+  /// startExceptionTable - When we finished JITing the function, if exception
+  /// handling is set, we emit the exception table.
+  virtual unsigned char* startExceptionTable(const Function* F,
+                                             uintptr_t &ActualSize) = 0;
+  
+  /// endExceptionTable - This method is called when the JIT is done emitting
+  /// the exception table.
+  virtual void endExceptionTable(const Function *F, unsigned char *TableStart,
+                                 unsigned char *TableEnd, 
+                                 unsigned char* FrameRegister) = 0;
 };
 
 } // end namespace llvm.