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#pragma once
#include <string.h>
#include <vector>
#include "WAVM/IR/IR.h"
#include "WAVM/IR/Types.h"
#include "WAVM/Inline/Assert.h"
#include "WAVM/Inline/BasicTypes.h"
#include "WAVM/Inline/Serialization.h"
#include "WAVM/Platform/Defines.h"
#include "OperatorTable.h"
namespace WAVM { namespace IR {
// Forward declarations.
struct Module;
// Structures for operator immediates
struct NoImm
{
};
struct MemoryImm
{
Uptr memoryIndex;
};
struct MemoryCopyImm
{
Uptr destMemoryIndex;
Uptr sourceMemoryIndex;
};
struct TableImm
{
Uptr tableIndex;
};
struct TableCopyImm
{
Uptr destTableIndex;
Uptr sourceTableIndex;
};
struct ControlStructureImm
{
IndexedBlockType type;
};
struct SelectImm
{
// ValueType::any represents a legacy select with the type inferred from the first operand
// following the condition.
ValueType type;
};
struct BranchImm
{
Uptr targetDepth;
};
struct BranchTableImm
{
Uptr defaultTargetDepth;
// An index into the FunctionDef's branchTables array.
Uptr branchTableIndex;
};
template<typename Value> struct LiteralImm
{
Value value;
};
template<bool isGlobal> struct GetOrSetVariableImm
{
Uptr variableIndex;
};
struct FunctionImm
{
Uptr functionIndex;
};
struct FunctionRefImm
{
Uptr functionIndex;
};
struct CallIndirectImm
{
IndexedFunctionType type;
Uptr tableIndex;
};
struct BaseLoadOrStoreImm
{
U8 alignmentLog2;
U64 offset;
Uptr memoryIndex;
};
template<Uptr naturalAlignmentLog2> struct LoadOrStoreImm : BaseLoadOrStoreImm
{
};
template<Uptr naturalAlignmentLog2, Uptr numLanes>
struct LoadOrStoreLaneImm : LoadOrStoreImm<naturalAlignmentLog2>
{
U8 laneIndex;
};
using LoadOrStoreI8x16LaneImm = LoadOrStoreLaneImm<0, 16>;
using LoadOrStoreI16x8LaneImm = LoadOrStoreLaneImm<1, 8>;
using LoadOrStoreI32x4LaneImm = LoadOrStoreLaneImm<2, 4>;
using LoadOrStoreI64x2LaneImm = LoadOrStoreLaneImm<3, 2>;
template<Uptr numLanes> struct LaneIndexImm
{
U8 laneIndex;
};
template<Uptr numLanes> struct ShuffleImm
{
U8 laneIndices[numLanes];
};
template<Uptr naturalAlignmentLog2> struct AtomicLoadOrStoreImm : BaseLoadOrStoreImm
{
};
enum class MemoryOrder
{
sequentiallyConsistent = 0
};
struct AtomicFenceImm
{
MemoryOrder order;
};
struct ExceptionTypeImm
{
Uptr exceptionTypeIndex;
};
struct DelegateImm
{
Uptr catchDepth;
};
struct RethrowImm
{
Uptr catchDepth;
};
struct DataSegmentAndMemImm
{
Uptr dataSegmentIndex;
Uptr memoryIndex;
};
struct DataSegmentImm
{
Uptr dataSegmentIndex;
};
struct ElemSegmentAndTableImm
{
Uptr elemSegmentIndex;
Uptr tableIndex;
};
struct ElemSegmentImm
{
Uptr elemSegmentIndex;
};
struct ReferenceTypeImm
{
ReferenceType referenceType;
};
enum class Opcode : U16
{
#define VISIT_OPCODE(opcode, name, ...) name = opcode,
WAVM_ENUM_OPERATORS(VISIT_OPCODE)
#undef VISIT_OPCODE
};
static constexpr U64 maxSingleByteOpcode = 0xdf;
template<typename Imm> struct OpcodeAndImm
{
Opcode opcode;
Imm imm;
};
// Specialize for the empty immediate struct so they don't take an extra byte of space.
template<> struct OpcodeAndImm<NoImm>
{
union
{
Opcode opcode;
NoImm imm;
};
};
// Decodes an operator from an input stream and dispatches by opcode.
struct OperatorDecoderStream
{
OperatorDecoderStream(const std::vector<U8>& codeBytes)
: nextByte(codeBytes.data()), end(codeBytes.data() + codeBytes.size())
{
}
operator bool() const { return nextByte < end; }
template<typename Visitor> typename Visitor::Result decodeOp(Visitor& visitor)
{
WAVM_ASSERT(nextByte + sizeof(Opcode) <= end);
Opcode opcode;
memcpy(&opcode, nextByte, sizeof(Opcode));
switch(opcode)
{
#define VISIT_OPCODE(opcode, name, nameString, Imm, ...) \
case Opcode::name: { \
WAVM_ASSERT(nextByte + sizeof(OpcodeAndImm<Imm>) <= end); \
OpcodeAndImm<Imm> encodedOperator; \
memcpy(&encodedOperator, nextByte, sizeof(OpcodeAndImm<Imm>)); \
nextByte += sizeof(OpcodeAndImm<Imm>); \
return visitor.name(encodedOperator.imm); \
}
WAVM_ENUM_OPERATORS(VISIT_OPCODE)
#undef VISIT_OPCODE
default: WAVM_UNREACHABLE();
}
}
template<typename Visitor> typename Visitor::Result decodeOpWithoutConsume(Visitor& visitor)
{
const U8* savedNextByte = nextByte;
typename Visitor::Result result = decodeOp(visitor);
nextByte = savedNextByte;
return result;
}
private:
const U8* nextByte;
const U8* end;
};
// Encodes an operator to an output stream.
struct OperatorEncoderStream
{
OperatorEncoderStream(Serialization::OutputStream& inByteStream) : byteStream(inByteStream)
{
}
#define VISIT_OPCODE(_, name, nameString, Imm, ...) \
void name(Imm imm = {}) \
{ \
OpcodeAndImm<Imm> encodedOperator; \
encodedOperator.opcode = Opcode::name; \
encodedOperator.imm = imm; \
memcpy((OpcodeAndImm<Imm>*)byteStream.advance(sizeof(OpcodeAndImm<Imm>)), \
&encodedOperator, \
sizeof(OpcodeAndImm<Imm>)); \
}
WAVM_ENUM_OPERATORS(VISIT_OPCODE)
#undef VISIT_OPCODE
private:
Serialization::OutputStream& byteStream;
};
WAVM_API const char* getOpcodeName(Opcode opcode);
}}
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