It's not necessary to do rounding for alloca operations when the requested

alignment is equal to the stack alignment.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@40004 91177308-0d34-0410-b5e6-96231b3b80d8

4 files changed, 351 insertions, 0 deletions

diff --git a/include/llvm/ExecutionEngine/ExecutionEngine.h b/include/llvm/ExecutionEngine/ExecutionEngine.h
new file mode 100644
index 0000000..7100a5f
--- /dev/null
+++ b/include/llvm/ExecutionEngine/ExecutionEngine.h
@@ -0,0 +1,227 @@
+//===- ExecutionEngine.h - Abstract Execution Engine Interface --*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file was developed by the LLVM research group and is distributed under
+// the University of Illinois Open Source License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file defines the abstract interface that implements execution support
+// for LLVM.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef EXECUTION_ENGINE_H
+#define EXECUTION_ENGINE_H
+
+#include <vector>
+#include <map>
+#include <cassert>
+#include <string>
+#include "llvm/System/Mutex.h"
+#include "llvm/ADT/SmallVector.h"
+
+namespace llvm {
+
+struct GenericValue;
+class Constant;
+class Function;
+class GlobalVariable;
+class GlobalValue;
+class Module;
+class ModuleProvider;
+class TargetData;
+class Type;
+class MutexGuard;
+
+class ExecutionEngineState {
+private:
+  /// GlobalAddressMap - A mapping between LLVM global values and their
+  /// actualized version...
+  std::map<const GlobalValue*, void *> GlobalAddressMap;
+
+  /// GlobalAddressReverseMap - This is the reverse mapping of GlobalAddressMap,
+  /// used to convert raw addresses into the LLVM global value that is emitted
+  /// at the address.  This map is not computed unless getGlobalValueAtAddress
+  /// is called at some point.
+  std::map<void *, const GlobalValue*> GlobalAddressReverseMap;
+
+public:
+  std::map<const GlobalValue*, void *> &
+  getGlobalAddressMap(const MutexGuard &locked) {
+    return GlobalAddressMap;
+  }
+
+  std::map<void*, const GlobalValue*> & 
+  getGlobalAddressReverseMap(const MutexGuard& locked) {
+    return GlobalAddressReverseMap;
+  }
+};
+
+
+class ExecutionEngine {
+  const TargetData *TD;
+  ExecutionEngineState state;
+  bool LazyCompilationDisabled;
+protected:
+  /// Modules - This is a list of ModuleProvider's that we are JIT'ing from.  We
+  /// use a smallvector to optimize for the case where there is only one module.
+  SmallVector<ModuleProvider*, 1> Modules;
+  
+  void setTargetData(const TargetData *td) {
+    TD = td;
+  }
+
+  // To avoid having libexecutionengine depend on the JIT and interpreter
+  // libraries, the JIT and Interpreter set these functions to ctor pointers
+  // at startup time if they are linked in.
+  typedef ExecutionEngine *(*EECtorFn)(ModuleProvider*, std::string*);
+  static EECtorFn JITCtor, InterpCtor;
+    
+public:
+  /// lock - This lock is protects the ExecutionEngine, JIT, JITResolver and
+  /// JITEmitter classes.  It must be held while changing the internal state of
+  /// any of those classes.
+  sys::Mutex lock; // Used to make this class and subclasses thread-safe
+
+  ExecutionEngine(ModuleProvider *P);
+  ExecutionEngine(Module *M);
+  virtual ~ExecutionEngine();
+
+  const TargetData *getTargetData() const { return TD; }
+
+  /// addModuleProvider - Add a ModuleProvider to the list of modules that we
+  /// can JIT from.  Note that this takes ownership of the ModuleProvider: when
+  /// the ExecutionEngine is destroyed, it destroys the MP as well.
+  void addModuleProvider(ModuleProvider *P) {
+    Modules.push_back(P);
+  }
+  
+  /// FindFunctionNamed - Search all of the active modules to find the one that
+  /// defines FnName.  This is very slow operation and shouldn't be used for
+  /// general code.
+  Function *FindFunctionNamed(const char *FnName);
+  
+  /// create - This is the factory method for creating an execution engine which
+  /// is appropriate for the current machine.
+  static ExecutionEngine *create(ModuleProvider *MP,
+                                 bool ForceInterpreter = false,
+                                 std::string *ErrorStr = 0);
+
+  /// runFunction - Execute the specified function with the specified arguments,
+  /// and return the result.
+  ///
+  virtual GenericValue runFunction(Function *F,
+                                const std::vector<GenericValue> &ArgValues) = 0;
+
+  /// runStaticConstructorsDestructors - This method is used to execute all of
+  /// the static constructors or destructors for a module, depending on the
+  /// value of isDtors.
+  void runStaticConstructorsDestructors(bool isDtors);
+  
+  
+  /// runFunctionAsMain - This is a helper function which wraps runFunction to
+  /// handle the common task of starting up main with the specified argc, argv,
+  /// and envp parameters.
+  int runFunctionAsMain(Function *Fn, const std::vector<std::string> &argv,
+                        const char * const * envp);
+
+
+  /// addGlobalMapping - Tell the execution engine that the specified global is
+  /// at the specified location.  This is used internally as functions are JIT'd
+  /// and as global variables are laid out in memory.  It can and should also be
+  /// used by clients of the EE that want to have an LLVM global overlay
+  /// existing data in memory.
+  void addGlobalMapping(const GlobalValue *GV, void *Addr);
+  
+  /// clearAllGlobalMappings - Clear all global mappings and start over again
+  /// use in dynamic compilation scenarios when you want to move globals
+  void clearAllGlobalMappings();
+  
+  /// updateGlobalMapping - Replace an existing mapping for GV with a new
+  /// address.  This updates both maps as required.  If "Addr" is null, the
+  /// entry for the global is removed from the mappings.
+  void updateGlobalMapping(const GlobalValue *GV, void *Addr);
+  
+  /// getPointerToGlobalIfAvailable - This returns the address of the specified
+  /// global value if it is has already been codegen'd, otherwise it returns
+  /// null.
+  ///
+  void *getPointerToGlobalIfAvailable(const GlobalValue *GV);
+
+  /// getPointerToGlobal - This returns the address of the specified global
+  /// value.  This may involve code generation if it's a function.
+  ///
+  void *getPointerToGlobal(const GlobalValue *GV);
+
+  /// getPointerToFunction - The different EE's represent function bodies in
+  /// different ways.  They should each implement this to say what a function
+  /// pointer should look like.
+  ///
+  virtual void *getPointerToFunction(Function *F) = 0;
+
+  /// getPointerToFunctionOrStub - If the specified function has been
+  /// code-gen'd, return a pointer to the function.  If not, compile it, or use
+  /// a stub to implement lazy compilation if available.
+  ///
+  virtual void *getPointerToFunctionOrStub(Function *F) {
+    // Default implementation, just codegen the function.
+    return getPointerToFunction(F);
+  }
+
+  /// getGlobalValueAtAddress - Return the LLVM global value object that starts
+  /// at the specified address.
+  ///
+  const GlobalValue *getGlobalValueAtAddress(void *Addr);
+
+
+  void StoreValueToMemory(const GenericValue &Val, GenericValue *Ptr, const Type *Ty);
+  void InitializeMemory(const Constant *Init, void *Addr);
+
+  /// recompileAndRelinkFunction - This method is used to force a function
+  /// which has already been compiled to be compiled again, possibly
+  /// after it has been modified. Then the entry to the old copy is overwritten
+  /// with a branch to the new copy. If there was no old copy, this acts
+  /// just like VM::getPointerToFunction().
+  ///
+  virtual void *recompileAndRelinkFunction(Function *F) = 0;
+
+  /// freeMachineCodeForFunction - Release memory in the ExecutionEngine
+  /// corresponding to the machine code emitted to execute this function, useful
+  /// for garbage-collecting generated code.
+  ///
+  virtual void freeMachineCodeForFunction(Function *F) = 0;
+
+  /// getOrEmitGlobalVariable - Return the address of the specified global
+  /// variable, possibly emitting it to memory if needed.  This is used by the
+  /// Emitter.
+  virtual void *getOrEmitGlobalVariable(const GlobalVariable *GV) {
+    return getPointerToGlobal((GlobalValue*)GV);
+  }
+  
+  /// DisableLazyCompilation - If called, the JIT will abort if lazy compilation
+  // is ever attempted.
+  void DisableLazyCompilation() {
+    LazyCompilationDisabled = true;
+  }
+  bool isLazyCompilationDisabled() const {
+    return LazyCompilationDisabled;
+  }
+
+protected:
+  void emitGlobals();
+
+  // EmitGlobalVariable - This method emits the specified global variable to the
+  // address specified in GlobalAddresses, or allocates new memory if it's not
+  // already in the map.
+  void EmitGlobalVariable(const GlobalVariable *GV);
+
+  GenericValue getConstantValue(const Constant *C);
+  void LoadValueFromMemory(GenericValue &Result, GenericValue *Ptr, 
+                           const Type *Ty);
+};
+
+} // End llvm namespace
+
+#endif
diff --git a/include/llvm/ExecutionEngine/GenericValue.h b/include/llvm/ExecutionEngine/GenericValue.h
new file mode 100644
index 0000000..d0cd2cd
--- /dev/null
+++ b/include/llvm/ExecutionEngine/GenericValue.h
@@ -0,0 +1,44 @@
+//===-- GenericValue.h - Represent any type of LLVM value -------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file was developed by the LLVM research group and is distributed under
+// the University of Illinois Open Source License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// The GenericValue class is used to represent an LLVM value of arbitrary type.
+//
+//===----------------------------------------------------------------------===//
+
+
+#ifndef GENERIC_VALUE_H
+#define GENERIC_VALUE_H
+
+#include "llvm/ADT/APInt.h"
+#include "llvm/Support/DataTypes.h"
+
+namespace llvm {
+
+typedef void* PointerTy;
+class APInt;
+
+struct GenericValue {
+  union {
+    double          DoubleVal;
+    float           FloatVal;
+    PointerTy       PointerVal;
+    struct { unsigned int first; unsigned int second; } UIntPairVal;
+    unsigned char   Untyped[8];
+  };
+  APInt IntVal;
+
+  GenericValue() : DoubleVal(0.0), IntVal(1,0) {}
+  GenericValue(void *V) : PointerVal(V), IntVal(1,0) { }
+};
+
+inline GenericValue PTOGV(void *P) { return GenericValue(P); }
+inline void* GVTOP(const GenericValue &GV) { return GV.PointerVal; }
+
+} // End llvm namespace
+#endif
diff --git a/include/llvm/ExecutionEngine/Interpreter.h b/include/llvm/ExecutionEngine/Interpreter.h
new file mode 100644
index 0000000..b46574d
--- /dev/null
+++ b/include/llvm/ExecutionEngine/Interpreter.h
@@ -0,0 +1,40 @@
+//===-- Interpreter.h - Abstract Execution Engine Interface -----*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file was developed by Jeff Cohen and is distributed under the
+// University of Illinois Open Source License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file forces the interpreter to link in on certain operating systems.
+// (Windows).
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef EXECUTION_ENGINE_INTERPRETER_H
+#define EXECUTION_ENGINE_INTERPRETER_H
+
+#include "llvm/ExecutionEngine/ExecutionEngine.h"
+#include <cstdlib>
+
+namespace llvm {
+  extern void LinkInInterpreter();
+}
+
+namespace {
+  struct ForceInterpreterLinking {
+    ForceInterpreterLinking() {
+      // We must reference the passes in such a way that compilers will not
+      // delete it all as dead code, even with whole program optimization,
+      // yet is effectively a NO-OP. As the compiler isn't smart enough
+      // to know that getenv() never returns -1, this will do the job.
+      if (std::getenv("bar") != (char*) -1)
+        return;
+
+      llvm::LinkInInterpreter();
+    }
+  } ForceInterpreterLinking;
+}
+
+#endif
diff --git a/include/llvm/ExecutionEngine/JIT.h b/include/llvm/ExecutionEngine/JIT.h
new file mode 100644
index 0000000..b801f1d
--- /dev/null
+++ b/include/llvm/ExecutionEngine/JIT.h
@@ -0,0 +1,40 @@
+//===-- JIT.h - Abstract Execution Engine Interface -------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file was developed by Jeff Cohen and is distributed under the
+// University of Illinois Open Source License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file forces the JIT to link in on certain operating systems.
+// (Windows).
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef EXECUTION_ENGINE_JIT_H
+#define EXECUTION_ENGINE_JIT_H
+
+#include "llvm/ExecutionEngine/ExecutionEngine.h"
+#include <cstdlib>
+
+namespace llvm {
+  extern void LinkInJIT();
+}
+
+namespace {
+  struct ForceJITLinking {
+    ForceJITLinking() {
+      // We must reference the passes in such a way that compilers will not
+      // delete it all as dead code, even with whole program optimization,
+      // yet is effectively a NO-OP. As the compiler isn't smart enough
+      // to know that getenv() never returns -1, this will do the job.
+      if (std::getenv("bar") != (char*) -1)
+        return;
+
+      llvm::LinkInJIT();
+    }
+  } ForceJITLinking;
+}
+
+#endif