InterpBuiltinBitCast.cpp File Reference

#include "InterpBuiltinBitCast.h"
#include "BitcastBuffer.h"
#include "Boolean.h"
#include "Context.h"
#include "Floating.h"
#include "Integral.h"
#include "InterpState.h"
#include "MemberPointer.h"
#include "Pointer.h"
#include "Record.h"
#include "clang/AST/ASTContext.h"
#include "clang/AST/RecordLayout.h"
#include "clang/Basic/TargetInfo.h"

Go to the source code of this file.

Macros
#define	BITCAST_TYPE_SWITCH(Expr, B)
#define	BITCAST_TYPE_SWITCH_FIXED_SIZE(Expr, B)

Typedefs
using	DataFunc = llvm::function_ref< bool(const Pointer &P, PrimType Ty, Bits BitOffset, Bits FullBitWidth, bool PackedBools)>
	Implement __builtin_bit_cast and related operations.

Functions
static bool	enumerateData (const Pointer &P, const Context &Ctx, Bits Offset, Bits BitsToRead, DataFunc F)
	We use this to recursively iterate over all fields and elements of a pointer and extract relevant data for a bitcast.
static bool	enumeratePointerFields (const Pointer &P, const Context &Ctx, Bits BitsToRead, DataFunc F)
static bool	CheckBitcastType (InterpState &S, CodePtr OpPC, QualType T, bool IsToType)

Macro Definition Documentation

BITCAST_TYPE_SWITCH

#define BITCAST_TYPE_SWITCH	(		Expr,
			B
	)

Value:

  do {                                                                         \
    switch (Expr) {                                                            \
      TYPE_SWITCH_CASE(PT_Sint8, B)                                            \
      TYPE_SWITCH_CASE(PT_Uint8, B)                                            \
      TYPE_SWITCH_CASE(PT_Sint16, B)                                           \
      TYPE_SWITCH_CASE(PT_Uint16, B)                                           \
      TYPE_SWITCH_CASE(PT_Sint32, B)                                           \
      TYPE_SWITCH_CASE(PT_Uint32, B)                                           \
      TYPE_SWITCH_CASE(PT_Sint64, B)                                           \
      TYPE_SWITCH_CASE(PT_Uint64, B)                                           \
      TYPE_SWITCH_CASE(PT_IntAP, B)                                            \
      TYPE_SWITCH_CASE(PT_IntAPS, B)                                           \
      TYPE_SWITCH_CASE(PT_Bool, B)                                             \
    default:                                                                   \
      llvm_unreachable("Unhandled bitcast type");                              \
    }                                                                          \
  } while (0)

Definition at line 40 of file InterpBuiltinBitCast.cpp.

BITCAST_TYPE_SWITCH_FIXED_SIZE

#define BITCAST_TYPE_SWITCH_FIXED_SIZE	(		Expr,
			B
	)

Value:

  do {                                                                         \
    switch (Expr) {                                                            \
      TYPE_SWITCH_CASE(PT_Sint8, B)                                            \
      TYPE_SWITCH_CASE(PT_Uint8, B)                                            \
      TYPE_SWITCH_CASE(PT_Sint16, B)                                           \
      TYPE_SWITCH_CASE(PT_Uint16, B)                                           \
      TYPE_SWITCH_CASE(PT_Sint32, B)                                           \
      TYPE_SWITCH_CASE(PT_Uint32, B)                                           \
      TYPE_SWITCH_CASE(PT_Sint64, B)                                           \
      TYPE_SWITCH_CASE(PT_Uint64, B)                                           \
      TYPE_SWITCH_CASE(PT_Bool, B)                                             \
    default:                                                                   \
      llvm_unreachable("Unhandled bitcast type");                              \
    }                                                                          \
  } while (0)

Definition at line 59 of file InterpBuiltinBitCast.cpp.

Typedef Documentation

DataFunc

using DataFunc = llvm::function_ref<bool(const Pointer &P, PrimType Ty, Bits BitOffset, Bits FullBitWidth, bool PackedBools)>

Implement __builtin_bit_cast and related operations.

Since our internal representation for data is more complex than something we can simply memcpy or memcmp, we first bitcast all the data into a buffer, which we then later use to copy the data into the target. Used to iterate over pointer fields.

Definition at line 36 of file InterpBuiltinBitCast.cpp.

Function Documentation

CheckBitcastType()

static bool CheckBitcastType ( InterpState &  S, CodePtr  OpPC, QualType  T, bool  IsToType  )

static

Definition at line 170 of file InterpBuiltinBitCast.cpp.

References CheckBitcastType(), E, clang::Type::getAs(), clang::Type::getAsRecordDecl(), clang::Sema::getASTContext(), clang::ASTContext::getBaseElementType(), clang::ASTContext::getCharWidth(), clang::ASTContext::getFloatTypeSemantics(), clang::Stmt::getSourceRange(), clang::ASTContext::getTypeSize(), clang::Type::isArrayType(), clang::Type::isExtVectorBoolType(), clang::Type::isMemberPointerType(), clang::Type::isPointerType(), clang::Type::isRealFloatingType(), clang::Type::isUnionType(), and clang::T.

Referenced by CheckBitcastType(), clang::interp::DoBitCast(), and clang::interp::DoBitCastPtr().

enumerateData()

static bool enumerateData ( const Pointer &  P, const Context &  Ctx, Bits  Offset, Bits  BitsToRead, DataFunc  F  )

static

We use this to recursively iterate over all fields and elements of a pointer and extract relevant data for a bitcast.

Definition at line 78 of file InterpBuiltinBitCast.cpp.

References clang::interp::Record::bases(), clang::interp::Context::classify(), clang::interp::Descriptor::ElemRecord, enumerateData(), clang::interp::Record::fields(), clang::interp::Context::getASTContext(), clang::ASTContext::getASTRecordLayout(), clang::ASTRecordLayout::getBaseClassOffset(), clang::interp::Record::getDecl(), clang::interp::Descriptor::getElemQualType(), clang::ASTRecordLayout::getFieldOffset(), clang::interp::Descriptor::getNumElems(), clang::interp::Descriptor::getPrimType(), clang::interp::Descriptor::getType(), clang::ASTContext::getTypeSize(), clang::interp::Pointer::initialize(), clang::interp::Descriptor::isCompositeArray(), clang::Type::isExtVectorBoolType(), clang::interp::Descriptor::isPrimitive(), clang::interp::Descriptor::isPrimitiveArray(), clang::interp::Descriptor::isRecord(), Ok, P, and clang::ASTContext::toBits().

Referenced by enumerateData(), and enumeratePointerFields().

enumeratePointerFields()

static bool enumeratePointerFields ( const Pointer &  P, const Context &  Ctx, Bits  BitsToRead, DataFunc  F  )

static

Definition at line 155 of file InterpBuiltinBitCast.cpp.

References enumerateData(), P, and clang::interp::Bits::zero().

Referenced by clang::interp::DoBitCastPtr(), clang::interp::DoMemcpy(), and clang::interp::readPointerToBuffer().