[wasm] Make the output of --wasm-trace-memory more understandable

R=clemensh@chromium.org

Change-Id: I21d185c73dc22a79311f3b35b2602a00a4b96112
Reviewed-on: https://chromium-review.googlesource.com/1141743Reviewed-by: Clemens Hammacher <clemensh@chromium.org>
Commit-Queue: Andreas Haas <ahaas@chromium.org>
Cr-Commit-Position: refs/heads/master@{#54547}

src/wasm/memory-tracing.cc

@@ -33,20 +33,21 @@ void TraceMemoryOperation(ExecutionEngine engine, const MemoryTracingInfo* info,
     default:
       SNPrintF(value, "???");
   }
-  char eng_c = '?';
+  const char* eng = "?";
   switch (engine) {
     case ExecutionEngine::kTurbofan:
-      eng_c = 'T';
+      eng = "turbofan";
       break;
     case ExecutionEngine::kLiftoff:
-      eng_c = 'L';
+      eng = "liftoff";
       break;
     case ExecutionEngine::kInterpreter:
-      eng_c = 'I';
+      eng = "interpreter";
       break;
   }
-  printf("%c %8d+0x%-6x %s @%08x %s\n", eng_c, func_index, position,
-         info->is_store ? "store" : "load ", info->address, value.start());
+  printf("%-11s func:%6d+0x%-6x%s %08x val: %s\n", eng, func_index, position,
+         info->is_store ? " store to" : "load from", info->address,
+         value.start());
 }
 
 }  // namespace wasm

test/message/wasm-trace-memory-interpreted.out

-I        0+0x3      load  @00000004 i32:0 / 00000000
-I        1+0x3      load  @00000001  i8:0 / 00
-I        3+0x5      store @00000004 i32:305419896 / 12345678
-I        0+0x3      load  @00000002 i32:1450704896 / 56780000
-I        1+0x3      load  @00000006  i8:52 / 34
-I        2+0x3      load  @00000002 f32:68169720922112.000000 / 56780000
-I        4+0x5      store @00000004  i8:171 / ab
-I        0+0x3      load  @00000002 i32:1454047232 / 56ab0000
-I        2+0x3      load  @00000002 f32:94008244174848.000000 / 56ab0000
+interpreter func:     0+0x3     load from 00000004 val: i32:0 / 00000000
+interpreter func:     1+0x3     load from 00000001 val:  i8:0 / 00
+interpreter func:     3+0x5      store to 00000004 val: i32:305419896 / 12345678
+interpreter func:     0+0x3     load from 00000002 val: i32:1450704896 / 56780000
+interpreter func:     1+0x3     load from 00000006 val:  i8:52 / 34
+interpreter func:     2+0x3     load from 00000002 val: f32:68169720922112.000000 / 56780000
+interpreter func:     4+0x5      store to 00000004 val:  i8:171 / ab
+interpreter func:     0+0x3     load from 00000002 val: i32:1454047232 / 56ab0000
+interpreter func:     2+0x3     load from 00000002 val: f32:94008244174848.000000 / 56ab0000

test/message/wasm-trace-memory-liftoff.out

-L        0+0x3      load  @00000004 i32:0 / 00000000
-L        1+0x3      load  @00000001  i8:0 / 00
-L        3+0x5      store @00000004 i32:305419896 / 12345678
-L        0+0x3      load  @00000002 i32:1450704896 / 56780000
-L        1+0x3      load  @00000006  i8:52 / 34
-L        2+0x3      load  @00000002 f32:68169720922112.000000 / 56780000
-L        4+0x5      store @00000004  i8:171 / ab
-L        0+0x3      load  @00000002 i32:1454047232 / 56ab0000
-L        2+0x3      load  @00000002 f32:94008244174848.000000 / 56ab0000
+liftoff     func:     0+0x3     load from 00000004 val: i32:0 / 00000000
+liftoff     func:     1+0x3     load from 00000001 val:  i8:0 / 00
+liftoff     func:     3+0x5      store to 00000004 val: i32:305419896 / 12345678
+liftoff     func:     0+0x3     load from 00000002 val: i32:1450704896 / 56780000
+liftoff     func:     1+0x3     load from 00000006 val:  i8:52 / 34
+liftoff     func:     2+0x3     load from 00000002 val: f32:68169720922112.000000 / 56780000
+liftoff     func:     4+0x5      store to 00000004 val:  i8:171 / ab
+liftoff     func:     0+0x3     load from 00000002 val: i32:1454047232 / 56ab0000
+liftoff     func:     2+0x3     load from 00000002 val: f32:94008244174848.000000 / 56ab0000

test/message/wasm-trace-memory.out

-T        0+0x3      load  @00000004 i32:0 / 00000000
-T        1+0x3      load  @00000001  i8:0 / 00
-T        3+0x5      store @00000004 i32:305419896 / 12345678
-T        0+0x3      load  @00000002 i32:1450704896 / 56780000
-T        1+0x3      load  @00000006  i8:52 / 34
-T        2+0x3      load  @00000002 f32:68169720922112.000000 / 56780000
-T        4+0x5      store @00000004  i8:171 / ab
-T        0+0x3      load  @00000002 i32:1454047232 / 56ab0000
-T        2+0x3      load  @00000002 f32:94008244174848.000000 / 56ab0000
+turbofan    func:     0+0x3     load from 00000004 val: i32:0 / 00000000
+turbofan    func:     1+0x3     load from 00000001 val:  i8:0 / 00
+turbofan    func:     3+0x5      store to 00000004 val: i32:305419896 / 12345678
+turbofan    func:     0+0x3     load from 00000002 val: i32:1450704896 / 56780000
+turbofan    func:     1+0x3     load from 00000006 val:  i8:52 / 34
+turbofan    func:     2+0x3     load from 00000002 val: f32:68169720922112.000000 / 56780000
+turbofan    func:     4+0x5      store to 00000004 val:  i8:171 / ab
+turbofan    func:     0+0x3     load from 00000002 val: i32:1454047232 / 56ab0000
+turbofan    func:     2+0x3     load from 00000002 val: f32:94008244174848.000000 / 56ab0000