[wasm] Remove TableSwitch and replace with br_table.

src/wasm/wasm-macro-gen.h

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_WASM_MACRO_GEN_H_
 #define V8_WASM_MACRO_GEN_H_
 
 #include "src/wasm/wasm-opcodes.h"
 
 // Convenience macros for building Wasm bytecode directly into a byte array.
@@ skipping 15 matching lines @@
 #define WASM_BRV(depth, val) kExprBr, static_cast<byte>(depth), val
 #define WASM_BRV_IF(depth, val, cond) \
   kExprBrIf, static_cast<byte>(depth), val, cond
 #define WASM_BREAK(depth) kExprBr, static_cast<byte>(depth + 1), kExprNop
 #define WASM_CONTINUE(depth) kExprBr, static_cast<byte>(depth), kExprNop
 #define WASM_BREAKV(depth, val) kExprBr, static_cast<byte>(depth + 1), val
 #define WASM_RETURN0 kExprReturn
 #define WASM_RETURN(...) kExprReturn, __VA_ARGS__
 #define WASM_UNREACHABLE kExprUnreachable
 
-#define WASM_TABLESWITCH_OP(case_count, table_count, ...)                 \
-  kExprTableSwitch, static_cast<byte>(case_count),                        \
-      static_cast<byte>(case_count >> 8), static_cast<byte>(table_count), \
-      static_cast<byte>(table_count >> 8), __VA_ARGS__
-
-#define WASM_TABLESWITCH_BODY0(key) key
-
-#define WASM_TABLESWITCH_BODY(key, ...) key, __VA_ARGS__
+#define WASM_BR_TABLE(key, count, ...) \
+  kExprBrTable, U16_LE(count), __VA_ARGS__, key
 
 #define WASM_CASE(x) static_cast<byte>(x), static_cast<byte>(x >> 8)
 #define WASM_CASE_BR(x) static_cast<byte>(x), static_cast<byte>(0x80 | (x) >> 8)
 
 //------------------------------------------------------------------------------
 // Misc expressions.
 //------------------------------------------------------------------------------
 #define WASM_ID(...) __VA_ARGS__
 #define WASM_ZERO kExprI8Const, 0
 #define WASM_ONE kExprI8Const, 1
@@ skipping 346 matching lines @@
   static_cast<byte>(v), static_cast<byte>((v) >> 8), \
       static_cast<byte>((v) >> 16), static_cast<byte>((v) >> 24)
 
 #define U16_LE(v) static_cast<byte>(v), static_cast<byte>((v) >> 8)
 
 #define WASM_MODULE_HEADER U32_LE(kWasmMagic), U32_LE(kWasmVersion)
 
 #define SIG_INDEX(v) U16_LE(v)
 #define FUNC_INDEX(v) U16_LE(v)
 #define NAME_OFFSET(v) U32_LE(v)
+#define BR_TARGET(v) U16_LE(v)
 
 #define MASK_7 ((1 << 7) - 1)
 #define MASK_14 ((1 << 14) - 1)
 #define MASK_21 ((1 << 21) - 1)
 #define MASK_28 ((1 << 28) - 1)
 
 #define U32V_1(x) static_cast<byte>(x & MASK_7)
 #define U32V_2(x) \
   static_cast<byte>((x & MASK_7) | 0x80), static_cast<byte>((x >> 7) & MASK_7)
 #define U32V_3(x)                                    \
   static_cast<byte>((x & MASK_7) | 0x80),            \
       static_cast<byte>(((x >> 7) & MASK_7) | 0x80), \
       static_cast<byte>((x >> 14) & MASK_7)
 #define U32V_4(x)                                     \
   static_cast<byte>((x & MASK_7) | 0x80),             \
       static_cast<byte>(((x >> 7) & MASK_7) | 0x80),  \
       static_cast<byte>(((x >> 14) & MASK_7) | 0x80), \
       static_cast<byte>((x >> 21) & MASK_7)
 #define U32V_5(x)                                     \
   static_cast<byte>((x & MASK_7) | 0x80),             \
       static_cast<byte>(((x >> 7) & MASK_7) | 0x80),  \
       static_cast<byte>(((x >> 14) & MASK_7) | 0x80), \
       static_cast<byte>(((x >> 21) & MASK_7) | 0x80), \
       static_cast<byte>(((x >> 28) & MASK_7))
 
 #endif  // V8_WASM_MACRO_GEN_H_