include/llvm-c/Target.h

/*===-- llvm-c/Target.h - Target Lib C Iface --------------------*- C++ -*-===*\
|*                                                                            *|
|*                     The LLVM Compiler Infrastructure                       *|
|*                                                                            *|
|* This file is distributed under the University of Illinois Open Source      *|
|* License. See LICENSE.TXT for details.                                      *|
|*                                                                            *|
|*===----------------------------------------------------------------------===*|
|*                                                                            *|
|* This header declares the C interface to libLLVMTarget.a, which             *|
|* implements target information.                                             *|
|*                                                                            *|
|* Many exotic languages can interoperate with C code but have a harder time  *|
|* with C++ due to name mangling. So in addition to C, this interface enables *|
|* tools written in such languages.                                           *|
|*                                                                            *|
\*===----------------------------------------------------------------------===*/

#ifndef LLVM_C_TARGET_H
#define LLVM_C_TARGET_H

#include "llvm-c/Core.h"
#include "llvm/Config/config.h"

#ifdef __cplusplus
extern "C" {
#endif

enum { LLVMBigEndian, LLVMLittleEndian };
typedef int LLVMByteOrdering;

typedef struct LLVMOpaqueTargetData *LLVMTargetDataRef;
typedef struct LLVMStructLayout *LLVMStructLayoutRef;

/* Declare all of the target-initialization functions that are available. */
#define LLVM_TARGET(TargetName) void LLVMInitialize##TargetName##Target();
#include "llvm/Config/Targets.def"

/** LLVMInitializeAllTargets - The main program should call this function if it
    wants to link in all available targets that LLVM is configured to
    support. */
static inline void LLVMInitializeAllTargets() {
#define LLVM_TARGET(TargetName) LLVMInitialize##TargetName##Target();
#include "llvm/Config/Targets.def"
}
  
/** LLVMInitializeNativeTarget - The main program should call this function to
    initialize the native target corresponding to the host.  This is useful 
    for JIT applications to ensure that the target gets linked in correctly. */
static inline int LLVMInitializeNativeTarget() {
  /* If we have a native target, initialize it to ensure it is linked in. */
#ifdef LLVM_NATIVE_ARCH
#define DoInit2(TARG)   LLVMInitialize ## TARG ()
#define DoInit(T) DoInit2(T)
  DoInit(LLVM_NATIVE_ARCH);
  return 0;
#undef DoInit
#undef DoInit2
#else
  return 1;
#endif
}  

/*===-- Target Data -------------------------------------------------------===*/

/** Creates target data from a target layout string.
    See the constructor llvm::TargetData::TargetData. */
LLVMTargetDataRef LLVMCreateTargetData(const char *StringRep);

/** Adds target data information to a pass manager. This does not take ownership
    of the target data.
    See the method llvm::PassManagerBase::add. */
void LLVMAddTargetData(LLVMTargetDataRef, LLVMPassManagerRef);

/** Converts target data to a target layout string. The string must be disposed
    with LLVMDisposeMessage.
    See the constructor llvm::TargetData::TargetData. */
char *LLVMCopyStringRepOfTargetData(LLVMTargetDataRef);

/** Returns the byte order of a target, either LLVMBigEndian or
    LLVMLittleEndian.
    See the method llvm::TargetData::isLittleEndian. */
LLVMByteOrdering LLVMByteOrder(LLVMTargetDataRef);

/** Returns the pointer size in bytes for a target.
    See the method llvm::TargetData::getPointerSize. */
unsigned LLVMPointerSize(LLVMTargetDataRef);

/** Returns the integer type that is the same size as a pointer on a target.
    See the method llvm::TargetData::getIntPtrType. */
LLVMTypeRef LLVMIntPtrType(LLVMTargetDataRef);

/** Computes the size of a type in bytes for a target.
    See the method llvm::TargetData::getTypeSizeInBits. */
unsigned long long LLVMSizeOfTypeInBits(LLVMTargetDataRef, LLVMTypeRef);

/** Computes the storage size of a type in bytes for a target.
    See the method llvm::TargetData::getTypeStoreSize. */
unsigned long long LLVMStoreSizeOfType(LLVMTargetDataRef, LLVMTypeRef);

/** Computes the ABI size of a type in bytes for a target.
    See the method llvm::TargetData::getTypeAllocSize. */
unsigned long long LLVMABISizeOfType(LLVMTargetDataRef, LLVMTypeRef);

/** Computes the ABI alignment of a type in bytes for a target.
    See the method llvm::TargetData::getTypeABISize. */
unsigned LLVMABIAlignmentOfType(LLVMTargetDataRef, LLVMTypeRef);

/** Computes the call frame alignment of a type in bytes for a target.
    See the method llvm::TargetData::getTypeABISize. */
unsigned LLVMCallFrameAlignmentOfType(LLVMTargetDataRef, LLVMTypeRef);

/** Computes the preferred alignment of a type in bytes for a target.
    See the method llvm::TargetData::getTypeABISize. */
unsigned LLVMPreferredAlignmentOfType(LLVMTargetDataRef, LLVMTypeRef);

/** Computes the preferred alignment of a global variable in bytes for a target.
    See the method llvm::TargetData::getPreferredAlignment. */
unsigned LLVMPreferredAlignmentOfGlobal(LLVMTargetDataRef,
                                        LLVMValueRef GlobalVar);

/** Computes the structure element that contains the byte offset for a target.
    See the method llvm::StructLayout::getElementContainingOffset. */
unsigned LLVMElementAtOffset(LLVMTargetDataRef, LLVMTypeRef StructTy,
                             unsigned long long Offset);

/** Computes the byte offset of the indexed struct element for a target.
    See the method llvm::StructLayout::getElementContainingOffset. */
unsigned long long LLVMOffsetOfElement(LLVMTargetDataRef, LLVMTypeRef StructTy,
                                       unsigned Element);

/** Struct layouts are speculatively cached. If a TargetDataRef is alive when
    types are being refined and removed, this method must be called whenever a
    struct type is removed to avoid a dangling pointer in this cache.
    See the method llvm::TargetData::InvalidateStructLayoutInfo. */
void LLVMInvalidateStructLayout(LLVMTargetDataRef, LLVMTypeRef StructTy);

/** Deallocates a TargetData.
    See the destructor llvm::TargetData::~TargetData. */
void LLVMDisposeTargetData(LLVMTargetDataRef);


#ifdef __cplusplus
}

namespace llvm {
  class TargetData;

  inline TargetData *unwrap(LLVMTargetDataRef P) {
    return reinterpret_cast<TargetData*>(P);
  }
  
  inline LLVMTargetDataRef wrap(const TargetData *P) {
    return reinterpret_cast<LLVMTargetDataRef>(const_cast<TargetData*>(P));
  }
}

#endif /* defined(__cplusplus) */

#endif