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llvm-project/llvm/lib/Target/WebAssembly/MCTargetDesc/WebAssemblyMCTargetDesc.h
Heejin Ahn da419bdb5e [WebAssembly] Add support for the event section 
Summary:
This adds support for the 'event section' specified in the exception
handling proposal. (This was named 'exception section' first, but later
renamed to 'event section' to take possibilities of other kinds of
events into consideration. But currently we only store exception info in
this section.)

The event section is added between the global section and the export
section. This is for ease of validation per request of the V8 team.

This patch:
- Creates the event symbol type, which is a weak symbol
- Makes 'throw' instruction take the event symbol '__cpp_exception'
- Adds relocation support for events
- Adds WasmObjectWriter / WasmObjectFile (Reader) support
- Adds obj2yaml / yaml2obj support
- Adds '.eventtype' printing support

Reviewers: dschuff, sbc100, aardappel

Subscribers: jgravelle-google, sunfish, llvm-commits

Differential Revision: https://reviews.llvm.org/D54096

llvm-svn: 346825
2018-11-14 02:46:21 +00:00

370 lines
12 KiB
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//==- WebAssemblyMCTargetDesc.h - WebAssembly Target Descriptions -*- C++ -*-=//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
///
/// \file
/// This file provides WebAssembly-specific target descriptions.
///
//===----------------------------------------------------------------------===//
#ifndef LLVM_LIB_TARGET_WEBASSEMBLY_MCTARGETDESC_WEBASSEMBLYMCTARGETDESC_H
#define LLVM_LIB_TARGET_WEBASSEMBLY_MCTARGETDESC_WEBASSEMBLYMCTARGETDESC_H
#include "llvm/BinaryFormat/Wasm.h"
#include "llvm/MC/MCInstrDesc.h"
#include "llvm/Support/DataTypes.h"
#include <memory>
namespace llvm {
class MCAsmBackend;
class MCCodeEmitter;
class MCContext;
class MCInstrInfo;
class MCObjectTargetWriter;
class MCSubtargetInfo;
class MVT;
class Target;
class Triple;
class raw_pwrite_stream;
Target &getTheWebAssemblyTarget32();
Target &getTheWebAssemblyTarget64();
MCCodeEmitter *createWebAssemblyMCCodeEmitter(const MCInstrInfo &MCII);
MCAsmBackend *createWebAssemblyAsmBackend(const Triple &TT);
std::unique_ptr<MCObjectTargetWriter>
createWebAssemblyWasmObjectWriter(bool Is64Bit);
namespace WebAssembly {
enum OperandType {
/// Basic block label in a branch construct.
OPERAND_BASIC_BLOCK = MCOI::OPERAND_FIRST_TARGET,
/// Local index.
OPERAND_LOCAL,
/// Global index.
OPERAND_GLOBAL,
/// 32-bit integer immediates.
OPERAND_I32IMM,
/// 64-bit integer immediates.
OPERAND_I64IMM,
/// 32-bit floating-point immediates.
OPERAND_F32IMM,
/// 64-bit floating-point immediates.
OPERAND_F64IMM,
/// 8-bit vector lane immediate
OPERAND_VEC_I8IMM,
/// 16-bit vector lane immediate
OPERAND_VEC_I16IMM,
/// 32-bit vector lane immediate
OPERAND_VEC_I32IMM,
/// 64-bit vector lane immediate
OPERAND_VEC_I64IMM,
/// 32-bit unsigned function indices.
OPERAND_FUNCTION32,
/// 32-bit unsigned memory offsets.
OPERAND_OFFSET32,
/// p2align immediate for load and store address alignment.
OPERAND_P2ALIGN,
/// signature immediate for block/loop.
OPERAND_SIGNATURE,
/// type signature immediate for call_indirect.
OPERAND_TYPEINDEX,
/// Event index.
OPERAND_EVENT,
};
} // end namespace WebAssembly
namespace WebAssemblyII {
enum {
// For variadic instructions, this flag indicates whether an operand
// in the variable_ops range is an immediate value.
VariableOpIsImmediate = (1 << 0),
// For immediate values in the variable_ops range, this flag indicates
// whether the value represents a control-flow label.
VariableOpImmediateIsLabel = (1 << 1)
};
/// Target Operand Flag enum.
enum TOF {
MO_NO_FLAG = 0,
// Flags to indicate the type of the symbol being referenced
MO_SYMBOL_FUNCTION = 0x1,
MO_SYMBOL_GLOBAL = 0x2,
MO_SYMBOL_EVENT = 0x4,
MO_SYMBOL_MASK = 0x7,
};
} // end namespace WebAssemblyII
} // end namespace llvm
// Defines symbolic names for WebAssembly registers. This defines a mapping from
// register name to register number.
//
#define GET_REGINFO_ENUM
#include "WebAssemblyGenRegisterInfo.inc"
// Defines symbolic names for the WebAssembly instructions.
//
#define GET_INSTRINFO_ENUM
#include "WebAssemblyGenInstrInfo.inc"
#define GET_SUBTARGETINFO_ENUM
#include "WebAssemblyGenSubtargetInfo.inc"
namespace llvm {
namespace WebAssembly {
/// Return the default p2align value for a load or store with the given opcode.
inline unsigned GetDefaultP2Align(unsigned Opcode) {
switch (Opcode) {
case WebAssembly::LOAD8_S_I32:
case WebAssembly::LOAD8_S_I32_S:
case WebAssembly::LOAD8_U_I32:
case WebAssembly::LOAD8_U_I32_S:
case WebAssembly::LOAD8_S_I64:
case WebAssembly::LOAD8_S_I64_S:
case WebAssembly::LOAD8_U_I64:
case WebAssembly::LOAD8_U_I64_S:
case WebAssembly::ATOMIC_LOAD8_U_I32:
case WebAssembly::ATOMIC_LOAD8_U_I32_S:
case WebAssembly::ATOMIC_LOAD8_U_I64:
case WebAssembly::ATOMIC_LOAD8_U_I64_S:
case WebAssembly::STORE8_I32:
case WebAssembly::STORE8_I32_S:
case WebAssembly::STORE8_I64:
case WebAssembly::STORE8_I64_S:
case WebAssembly::ATOMIC_STORE8_I32:
case WebAssembly::ATOMIC_STORE8_I32_S:
case WebAssembly::ATOMIC_STORE8_I64:
case WebAssembly::ATOMIC_STORE8_I64_S:
case WebAssembly::ATOMIC_RMW8_U_ADD_I32:
case WebAssembly::ATOMIC_RMW8_U_ADD_I32_S:
case WebAssembly::ATOMIC_RMW8_U_ADD_I64:
case WebAssembly::ATOMIC_RMW8_U_ADD_I64_S:
case WebAssembly::ATOMIC_RMW8_U_SUB_I32:
case WebAssembly::ATOMIC_RMW8_U_SUB_I32_S:
case WebAssembly::ATOMIC_RMW8_U_SUB_I64:
case WebAssembly::ATOMIC_RMW8_U_SUB_I64_S:
case WebAssembly::ATOMIC_RMW8_U_AND_I32:
case WebAssembly::ATOMIC_RMW8_U_AND_I32_S:
case WebAssembly::ATOMIC_RMW8_U_AND_I64:
case WebAssembly::ATOMIC_RMW8_U_AND_I64_S:
case WebAssembly::ATOMIC_RMW8_U_OR_I32:
case WebAssembly::ATOMIC_RMW8_U_OR_I32_S:
case WebAssembly::ATOMIC_RMW8_U_OR_I64:
case WebAssembly::ATOMIC_RMW8_U_OR_I64_S:
case WebAssembly::ATOMIC_RMW8_U_XOR_I32:
case WebAssembly::ATOMIC_RMW8_U_XOR_I32_S:
case WebAssembly::ATOMIC_RMW8_U_XOR_I64:
case WebAssembly::ATOMIC_RMW8_U_XOR_I64_S:
case WebAssembly::ATOMIC_RMW8_U_XCHG_I32:
case WebAssembly::ATOMIC_RMW8_U_XCHG_I32_S:
case WebAssembly::ATOMIC_RMW8_U_XCHG_I64:
case WebAssembly::ATOMIC_RMW8_U_XCHG_I64_S:
case WebAssembly::ATOMIC_RMW8_U_CMPXCHG_I32:
case WebAssembly::ATOMIC_RMW8_U_CMPXCHG_I32_S:
case WebAssembly::ATOMIC_RMW8_U_CMPXCHG_I64:
case WebAssembly::ATOMIC_RMW8_U_CMPXCHG_I64_S:
return 0;
case WebAssembly::LOAD16_S_I32:
case WebAssembly::LOAD16_S_I32_S:
case WebAssembly::LOAD16_U_I32:
case WebAssembly::LOAD16_U_I32_S:
case WebAssembly::LOAD16_S_I64:
case WebAssembly::LOAD16_S_I64_S:
case WebAssembly::LOAD16_U_I64:
case WebAssembly::LOAD16_U_I64_S:
case WebAssembly::ATOMIC_LOAD16_U_I32:
case WebAssembly::ATOMIC_LOAD16_U_I32_S:
case WebAssembly::ATOMIC_LOAD16_U_I64:
case WebAssembly::ATOMIC_LOAD16_U_I64_S:
case WebAssembly::STORE16_I32:
case WebAssembly::STORE16_I32_S:
case WebAssembly::STORE16_I64:
case WebAssembly::STORE16_I64_S:
case WebAssembly::ATOMIC_STORE16_I32:
case WebAssembly::ATOMIC_STORE16_I32_S:
case WebAssembly::ATOMIC_STORE16_I64:
case WebAssembly::ATOMIC_STORE16_I64_S:
case WebAssembly::ATOMIC_RMW16_U_ADD_I32:
case WebAssembly::ATOMIC_RMW16_U_ADD_I32_S:
case WebAssembly::ATOMIC_RMW16_U_ADD_I64:
case WebAssembly::ATOMIC_RMW16_U_ADD_I64_S:
case WebAssembly::ATOMIC_RMW16_U_SUB_I32:
case WebAssembly::ATOMIC_RMW16_U_SUB_I32_S:
case WebAssembly::ATOMIC_RMW16_U_SUB_I64:
case WebAssembly::ATOMIC_RMW16_U_SUB_I64_S:
case WebAssembly::ATOMIC_RMW16_U_AND_I32:
case WebAssembly::ATOMIC_RMW16_U_AND_I32_S:
case WebAssembly::ATOMIC_RMW16_U_AND_I64:
case WebAssembly::ATOMIC_RMW16_U_AND_I64_S:
case WebAssembly::ATOMIC_RMW16_U_OR_I32:
case WebAssembly::ATOMIC_RMW16_U_OR_I32_S:
case WebAssembly::ATOMIC_RMW16_U_OR_I64:
case WebAssembly::ATOMIC_RMW16_U_OR_I64_S:
case WebAssembly::ATOMIC_RMW16_U_XOR_I32:
case WebAssembly::ATOMIC_RMW16_U_XOR_I32_S:
case WebAssembly::ATOMIC_RMW16_U_XOR_I64:
case WebAssembly::ATOMIC_RMW16_U_XOR_I64_S:
case WebAssembly::ATOMIC_RMW16_U_XCHG_I32:
case WebAssembly::ATOMIC_RMW16_U_XCHG_I32_S:
case WebAssembly::ATOMIC_RMW16_U_XCHG_I64:
case WebAssembly::ATOMIC_RMW16_U_XCHG_I64_S:
case WebAssembly::ATOMIC_RMW16_U_CMPXCHG_I32:
case WebAssembly::ATOMIC_RMW16_U_CMPXCHG_I32_S:
case WebAssembly::ATOMIC_RMW16_U_CMPXCHG_I64:
case WebAssembly::ATOMIC_RMW16_U_CMPXCHG_I64_S:
return 1;
case WebAssembly::LOAD_I32:
case WebAssembly::LOAD_I32_S:
case WebAssembly::LOAD_F32:
case WebAssembly::LOAD_F32_S:
case WebAssembly::STORE_I32:
case WebAssembly::STORE_I32_S:
case WebAssembly::STORE_F32:
case WebAssembly::STORE_F32_S:
case WebAssembly::LOAD32_S_I64:
case WebAssembly::LOAD32_S_I64_S:
case WebAssembly::LOAD32_U_I64:
case WebAssembly::LOAD32_U_I64_S:
case WebAssembly::STORE32_I64:
case WebAssembly::STORE32_I64_S:
case WebAssembly::ATOMIC_LOAD_I32:
case WebAssembly::ATOMIC_LOAD_I32_S:
case WebAssembly::ATOMIC_LOAD32_U_I64:
case WebAssembly::ATOMIC_LOAD32_U_I64_S:
case WebAssembly::ATOMIC_STORE_I32:
case WebAssembly::ATOMIC_STORE_I32_S:
case WebAssembly::ATOMIC_STORE32_I64:
case WebAssembly::ATOMIC_STORE32_I64_S:
case WebAssembly::ATOMIC_RMW_ADD_I32:
case WebAssembly::ATOMIC_RMW_ADD_I32_S:
case WebAssembly::ATOMIC_RMW32_U_ADD_I64:
case WebAssembly::ATOMIC_RMW32_U_ADD_I64_S:
case WebAssembly::ATOMIC_RMW_SUB_I32:
case WebAssembly::ATOMIC_RMW_SUB_I32_S:
case WebAssembly::ATOMIC_RMW32_U_SUB_I64:
case WebAssembly::ATOMIC_RMW32_U_SUB_I64_S:
case WebAssembly::ATOMIC_RMW_AND_I32:
case WebAssembly::ATOMIC_RMW_AND_I32_S:
case WebAssembly::ATOMIC_RMW32_U_AND_I64:
case WebAssembly::ATOMIC_RMW32_U_AND_I64_S:
case WebAssembly::ATOMIC_RMW_OR_I32:
case WebAssembly::ATOMIC_RMW_OR_I32_S:
case WebAssembly::ATOMIC_RMW32_U_OR_I64:
case WebAssembly::ATOMIC_RMW32_U_OR_I64_S:
case WebAssembly::ATOMIC_RMW_XOR_I32:
case WebAssembly::ATOMIC_RMW_XOR_I32_S:
case WebAssembly::ATOMIC_RMW32_U_XOR_I64:
case WebAssembly::ATOMIC_RMW32_U_XOR_I64_S:
case WebAssembly::ATOMIC_RMW_XCHG_I32:
case WebAssembly::ATOMIC_RMW_XCHG_I32_S:
case WebAssembly::ATOMIC_RMW32_U_XCHG_I64:
case WebAssembly::ATOMIC_RMW32_U_XCHG_I64_S:
case WebAssembly::ATOMIC_RMW_CMPXCHG_I32:
case WebAssembly::ATOMIC_RMW_CMPXCHG_I32_S:
case WebAssembly::ATOMIC_RMW32_U_CMPXCHG_I64:
case WebAssembly::ATOMIC_RMW32_U_CMPXCHG_I64_S:
case WebAssembly::ATOMIC_NOTIFY:
case WebAssembly::ATOMIC_NOTIFY_S:
case WebAssembly::ATOMIC_WAIT_I32:
case WebAssembly::ATOMIC_WAIT_I32_S:
return 2;
case WebAssembly::LOAD_I64:
case WebAssembly::LOAD_I64_S:
case WebAssembly::LOAD_F64:
case WebAssembly::LOAD_F64_S:
case WebAssembly::STORE_I64:
case WebAssembly::STORE_I64_S:
case WebAssembly::STORE_F64:
case WebAssembly::STORE_F64_S:
case WebAssembly::ATOMIC_LOAD_I64:
case WebAssembly::ATOMIC_LOAD_I64_S:
case WebAssembly::ATOMIC_STORE_I64:
case WebAssembly::ATOMIC_STORE_I64_S:
case WebAssembly::ATOMIC_RMW_ADD_I64:
case WebAssembly::ATOMIC_RMW_ADD_I64_S:
case WebAssembly::ATOMIC_RMW_SUB_I64:
case WebAssembly::ATOMIC_RMW_SUB_I64_S:
case WebAssembly::ATOMIC_RMW_AND_I64:
case WebAssembly::ATOMIC_RMW_AND_I64_S:
case WebAssembly::ATOMIC_RMW_OR_I64:
case WebAssembly::ATOMIC_RMW_OR_I64_S:
case WebAssembly::ATOMIC_RMW_XOR_I64:
case WebAssembly::ATOMIC_RMW_XOR_I64_S:
case WebAssembly::ATOMIC_RMW_XCHG_I64:
case WebAssembly::ATOMIC_RMW_XCHG_I64_S:
case WebAssembly::ATOMIC_RMW_CMPXCHG_I64:
case WebAssembly::ATOMIC_RMW_CMPXCHG_I64_S:
case WebAssembly::ATOMIC_WAIT_I64:
case WebAssembly::ATOMIC_WAIT_I64_S:
return 3;
case WebAssembly::LOAD_v16i8:
case WebAssembly::LOAD_v16i8_S:
case WebAssembly::LOAD_v8i16:
case WebAssembly::LOAD_v8i16_S:
case WebAssembly::LOAD_v4i32:
case WebAssembly::LOAD_v4i32_S:
case WebAssembly::LOAD_v2i64:
case WebAssembly::LOAD_v2i64_S:
case WebAssembly::LOAD_v4f32:
case WebAssembly::LOAD_v4f32_S:
case WebAssembly::LOAD_v2f64:
case WebAssembly::LOAD_v2f64_S:
case WebAssembly::STORE_v16i8:
case WebAssembly::STORE_v16i8_S:
case WebAssembly::STORE_v8i16:
case WebAssembly::STORE_v8i16_S:
case WebAssembly::STORE_v4i32:
case WebAssembly::STORE_v4i32_S:
case WebAssembly::STORE_v2i64:
case WebAssembly::STORE_v2i64_S:
case WebAssembly::STORE_v4f32:
case WebAssembly::STORE_v4f32_S:
case WebAssembly::STORE_v2f64:
case WebAssembly::STORE_v2f64_S:
return 4;
default:
llvm_unreachable("Only loads and stores have p2align values");
}
}
/// The operand number of the load or store address in load/store instructions.
static const unsigned LoadAddressOperandNo = 3;
static const unsigned StoreAddressOperandNo = 2;
/// The operand number of the load or store p2align in load/store instructions.
static const unsigned LoadP2AlignOperandNo = 1;
static const unsigned StoreP2AlignOperandNo = 0;
/// This is used to indicate block signatures.
enum class ExprType : unsigned {
Void = 0x40,
I32 = 0x7F,
I64 = 0x7E,
F32 = 0x7D,
F64 = 0x7C,
V128 = 0x7B,
ExceptRef = 0x68
};
/// Instruction opcodes emitted via means other than CodeGen.
static const unsigned Nop = 0x01;
static const unsigned End = 0x0b;
wasm::ValType toValType(const MVT &Ty);
} // end namespace WebAssembly
} // end namespace llvm
#endif
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