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"
#include <variant>

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
	Implement __builtin_bit_cast and related operations.
using	PrimTypeVariant

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 42 of file InterpBuiltinBitCast.cpp.

Referenced by clang::interp::readPointerToBuffer().

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 61 of file InterpBuiltinBitCast.cpp.

Referenced by clang::interp::DoBitCastPtr().

Typedef Documentation

DataFunc

using DataFunc

Initial value:

 
    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 38 of file InterpBuiltinBitCast.cpp.

PrimTypeVariant

using PrimTypeVariant

Initial value:

 
    std::variant<Pointer, FunctionPointer, MemberPointer, FixedPoint,
                 Integral<8, false>, Integral<8, true>, Integral<16, false>,
                 Integral<16, true>, Integral<32, false>, Integral<32, true>,
                 Integral<64, false>, Integral<64, true>, IntegralAP<true>,
                 IntegralAP<false>, Boolean, Floating>

Definition at line 458 of file InterpBuiltinBitCast.cpp.

Function Documentation

CheckBitcastType()

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

static

Definition at line 173 of file InterpBuiltinBitCast.cpp.

References CheckBitcastType(), clang::interp::InterpState::Current, clang::interp::State::FFDiag(), clang::interp::InterpState::getASTContext(), clang::ASTContext::getBaseElementType(), clang::ASTContext::getCharWidth(), clang::interp::InterpFrame::getExpr(), clang::ASTContext::getFloatTypeSemantics(), clang::Stmt::getSourceRange(), clang::ASTContext::getTypeSize(), clang::Type::isPackedVectorBoolType(), clang::Type::isRealFloatingType(), clang::interp::State::Note(), and clang::T.

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

enumerateData()

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 80 of file InterpBuiltinBitCast.cpp.

References clang::interp::Pointer::atField(), clang::interp::Pointer::atIndex(), clang::interp::Record::bases(), clang::cast(), 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::interp::Pointer::getFieldDesc(), clang::ASTRecordLayout::getFieldOffset(), clang::interp::Pointer::getIndex(), 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::isPackedVectorBoolType(), clang::interp::Descriptor::isPrimitive(), clang::interp::Descriptor::isPrimitiveArray(), clang::interp::Descriptor::isRecord(), clang::interp::Pointer::narrow(), Ok, and clang::ASTContext::toBits().

Referenced by enumerateData(), and enumeratePointerFields().

enumeratePointerFields()

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

static

Definition at line 158 of file InterpBuiltinBitCast.cpp.

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

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