[wasm][asm.js] Adding custom asm.js lexer.

src/flag-definitions.h

 // Copyright 2012 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.
 
 // This file defines all of the flags.  It is separated into different section,
 // for Debug, Release, Logging and Profiling, etc.  To add a new flag, find the
 // correct section, and use one of the DEFINE_ macros, without a trailing ';'.
 //
 // This include does not have a guard, because it is a template-style include,
 // which can be included multiple times in different modes.  It expects to have
@@ skipping 528 matching lines @@
 DEFINE_INT(trace_wasm_ast_start, 0,
            "start function for WASM AST trace (inclusive)")
 DEFINE_INT(trace_wasm_ast_end, 0, "end function for WASM AST trace (exclusive)")
 DEFINE_UINT(skip_compiling_wasm_funcs, 0, "start compiling at function N")
 DEFINE_BOOL(wasm_break_on_decoder_error, false,
             "debug break when wasm decoder encounters an error")
 DEFINE_BOOL(wasm_loop_assignment_analysis, true,
             "perform loop assignment analysis for WASM")
 
 DEFINE_BOOL(validate_asm, false, "validate asm.js modules before compiling")
+DEFINE_BOOL(fast_validate_asm, false,
+            "validate asm.js modules before compiling")
+DEFINE_IMPLICATION(fast_validate_asm, validate_asm)

[vogelheim, 2017/03/16 12:46:48]

I don't see these being used in this CL. Is this intentional?

(Should be fine, since you'll almost certainly need those flags in a subsequent
CL anyhow.)

[bradn, 2017/03/16 17:03:15]

Bad merge, will remove for this CL.

 DEFINE_BOOL(suppress_asm_messages, false,
             "don't emit asm.js related messages (for golden file testing)")
 DEFINE_BOOL(trace_asm_time, false, "log asm.js timing info to the console")
+DEFINE_BOOL(trace_asm_scanner, false,
+            "log tokens encountered by asm.js scanner")
 
 DEFINE_BOOL(dump_wasm_module, false, "dump WASM module bytes")
 DEFINE_STRING(dump_wasm_module_path, NULL, "directory to dump wasm modules to")
 
 DEFINE_INT(typed_array_max_size_in_heap, 64,
            "threshold for in-heap typed array")
 
 DEFINE_BOOL(wasm_simd_prototype, false,
             "enable prototype simd opcodes for wasm")
 DEFINE_BOOL(wasm_eh_prototype, false,
@@ skipping 764 matching lines @@
 #undef DEFINE_ALIAS_FLOAT
 #undef DEFINE_ALIAS_ARGS
 
 #undef FLAG_MODE_DECLARE
 #undef FLAG_MODE_DEFINE
 #undef FLAG_MODE_DEFINE_DEFAULTS
 #undef FLAG_MODE_META
 #undef FLAG_MODE_DEFINE_IMPLICATIONS
 
 #undef COMMA