v8/src/flag-definitions.h

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// 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
// a mode defined before it's included. The modes are FLAG_MODE_... below:
#define DEFINE_IMPLICATION(whenflag, thenflag) \
DEFINE_VALUE_IMPLICATION(whenflag, thenflag, true)
#define DEFINE_NEG_IMPLICATION(whenflag, thenflag) \
DEFINE_VALUE_IMPLICATION(whenflag, thenflag, false)
#define DEFINE_NEG_NEG_IMPLICATION(whenflag, thenflag) \
DEFINE_NEG_VALUE_IMPLICATION(whenflag, thenflag, false)
// We want to declare the names of the variables for the header file. Normally
// this will just be an extern declaration, but for a readonly flag we let the
// compiler make better optimizations by giving it the value.
#if defined(FLAG_MODE_DECLARE)
#define FLAG_FULL(ftype, ctype, nam, def, cmt) extern ctype FLAG_##nam;
#define FLAG_READONLY(ftype, ctype, nam, def, cmt) \
static ctype const FLAG_##nam = def;
// We want to supply the actual storage and value for the flag variable in the
// .cc file. We only do this for writable flags.
#elif defined(FLAG_MODE_DEFINE)
#define FLAG_FULL(ftype, ctype, nam, def, cmt) ctype FLAG_##nam = def;
// We need to define all of our default values so that the Flag structure can
// access them by pointer. These are just used internally inside of one .cc,
// for MODE_META, so there is no impact on the flags interface.
#elif defined(FLAG_MODE_DEFINE_DEFAULTS)
#define FLAG_FULL(ftype, ctype, nam, def, cmt) \
static ctype const FLAGDEFAULT_##nam = def;
// We want to write entries into our meta data table, for internal parsing and
// printing / etc in the flag parser code. We only do this for writable flags.
#elif defined(FLAG_MODE_META)
#define FLAG_FULL(ftype, ctype, nam, def, cmt) \
{ Flag::TYPE_##ftype, #nam, &FLAG_##nam, &FLAGDEFAULT_##nam, cmt, false } \
,
#define FLAG_ALIAS(ftype, ctype, alias, nam) \
{ \
Flag::TYPE_##ftype, #alias, &FLAG_##nam, &FLAGDEFAULT_##nam, \
"alias for --" #nam, false \
} \
,
// We produce the code to set flags when it is implied by another flag.
#elif defined(FLAG_MODE_DEFINE_IMPLICATIONS)
#define DEFINE_VALUE_IMPLICATION(whenflag, thenflag, value) \
if (FLAG_##whenflag) FLAG_##thenflag = value;
#define DEFINE_NEG_VALUE_IMPLICATION(whenflag, thenflag, value) \
if (!FLAG_##whenflag) FLAG_##thenflag = value;
#else
#error No mode supplied when including flags.defs
#endif
// Dummy defines for modes where it is not relevant.
#ifndef FLAG_FULL
#define FLAG_FULL(ftype, ctype, nam, def, cmt)
#endif
#ifndef FLAG_READONLY
#define FLAG_READONLY(ftype, ctype, nam, def, cmt)
#endif
#ifndef FLAG_ALIAS
#define FLAG_ALIAS(ftype, ctype, alias, nam)
#endif
#ifndef DEFINE_VALUE_IMPLICATION
#define DEFINE_VALUE_IMPLICATION(whenflag, thenflag, value)
#endif
#ifndef DEFINE_NEG_VALUE_IMPLICATION
#define DEFINE_NEG_VALUE_IMPLICATION(whenflag, thenflag, value)
#endif
#define COMMA ,
#ifdef FLAG_MODE_DECLARE
// Structure used to hold a collection of arguments to the JavaScript code.
struct JSArguments {
public:
inline const char*& operator[](int idx) const { return argv[idx]; }
static JSArguments Create(int argc, const char** argv) {
JSArguments args;
args.argc = argc;
args.argv = argv;
return args;
}
int argc;
const char** argv;
};
struct MaybeBoolFlag {
static MaybeBoolFlag Create(bool has_value, bool value) {
MaybeBoolFlag flag;
flag.has_value = has_value;
flag.value = value;
return flag;
}
bool has_value;
bool value;
};
#endif
#ifdef DEBUG
#define DEBUG_BOOL true
#else
#define DEBUG_BOOL false
#endif
#if (defined CAN_USE_VFP3_INSTRUCTIONS) || !(defined ARM_TEST_NO_FEATURE_PROBE)
#define ENABLE_VFP3_DEFAULT true
#else
#define ENABLE_VFP3_DEFAULT false
#endif
#if (defined CAN_USE_ARMV7_INSTRUCTIONS) || !(defined ARM_TEST_NO_FEATURE_PROBE)
#define ENABLE_ARMV7_DEFAULT true
#else
#define ENABLE_ARMV7_DEFAULT false
#endif
#if (defined CAN_USE_ARMV8_INSTRUCTIONS) || !(defined ARM_TEST_NO_FEATURE_PROBE)
#define ENABLE_ARMV8_DEFAULT true
#else
#define ENABLE_ARMV8_DEFAULT false
#endif
#if (defined CAN_USE_VFP32DREGS) || !(defined ARM_TEST_NO_FEATURE_PROBE)
#define ENABLE_32DREGS_DEFAULT true
#else
#define ENABLE_32DREGS_DEFAULT false
#endif
#if (defined CAN_USE_NEON) || !(defined ARM_TEST_NO_FEATURE_PROBE)
# define ENABLE_NEON_DEFAULT true
#else
# define ENABLE_NEON_DEFAULT false
#endif
[Interpreter] Add option to trace bytecode execution. Adds --trace-ignition flag which allows tracing of bytecodes as they execute. As well as printing out the bytecode, this also prints out the input and output registers to each operation. The generated output looks as follows: -> 0x350cb46d5264 (139) : 49 fc fb 03 07 Call r4, r5, #3, [7] [ accumulator -> 0x177fba00bc99 <JS Array[2]> ] [ r4 -> 0x350cb46ce099 <JS Function InstallFunctions (SharedFunctionInfo 0x350cb46470c1)> ] [ r5 -> 0x350cb46cddc1 <an Object with map 0x35fdf590a3a9> ] [ r6 -> 0x350cb46d3f11 <JS Function Proxy (SharedFunctionInfo 0x350cb46d3e61)> ] [ r7 -> 2 ] [ accumulator <- 0x350cb4604189 <undefined> ] -> 0x350cb46d5978 (47) : 4b f8 00 00 00 CallRuntime [248], r0, #0 [ accumulator -> 0x350cb4604189 <undefined> ] [ accumulator <- 0x350cb4604189 <undefined> ] -> 0x350cb46d597d (52) : 23 09 Ldar a0 [ accumulator -> 0x350cb4604189 <undefined> ] [ a0 -> 0x350cb46d3f11 <JS Function Proxy (SharedFunctionInfo 0x350cb46d3e61)> ] [ accumulator <- 0x350cb46d3f11 <JS Function Proxy (SharedFunctionInfo 0x350cb46d3e61)> ] -> 0x350cb46d597f (54) : 24 fd Star r3 [ accumulator -> 0x350cb46d3f11 <JS Function Proxy (SharedFunctionInfo 0x350cb46d3e61)> ] [ accumulator <- 0x350cb46d3f11 <JS Function Proxy (SharedFunctionInfo 0x350cb46d3e61)> ] [ r3 <- 0x350cb46d3f11 <JS Function Proxy (SharedFunctionInfo 0x350cb46d3e61)> ] Also adds support for --print_source and --print-ast to the interpreter. BUG=v8:4280 LOG=N Review URL: https://codereview.chromium.org/1640213002 Cr-Commit-Position: refs/heads/master@{#33594}
2016-01-28 18:17:30 +00:00
#ifdef V8_OS_WIN
# define ENABLE_LOG_COLOUR false
#else
# define ENABLE_LOG_COLOUR true
#endif
#define DEFINE_BOOL(nam, def, cmt) FLAG(BOOL, bool, nam, def, cmt)
#define DEFINE_BOOL_READONLY(nam, def, cmt) \
FLAG_READONLY(BOOL, bool, nam, def, cmt)
#define DEFINE_MAYBE_BOOL(nam, cmt) \
FLAG(MAYBE_BOOL, MaybeBoolFlag, nam, {false COMMA false}, cmt)
#define DEFINE_INT(nam, def, cmt) FLAG(INT, int, nam, def, cmt)
#define DEFINE_FLOAT(nam, def, cmt) FLAG(FLOAT, double, nam, def, cmt)
#define DEFINE_STRING(nam, def, cmt) FLAG(STRING, const char*, nam, def, cmt)
#define DEFINE_ARGS(nam, cmt) FLAG(ARGS, JSArguments, nam, {0 COMMA NULL}, cmt)
#define DEFINE_ALIAS_BOOL(alias, nam) FLAG_ALIAS(BOOL, bool, alias, nam)
#define DEFINE_ALIAS_INT(alias, nam) FLAG_ALIAS(INT, int, alias, nam)
#define DEFINE_ALIAS_FLOAT(alias, nam) FLAG_ALIAS(FLOAT, double, alias, nam)
#define DEFINE_ALIAS_STRING(alias, nam) \
FLAG_ALIAS(STRING, const char*, alias, nam)
#define DEFINE_ALIAS_ARGS(alias, nam) FLAG_ALIAS(ARGS, JSArguments, alias, nam)
//
// Flags in all modes.
//
#define FLAG FLAG_FULL
DEFINE_BOOL(experimental_extras, false,
"enable code compiled in via v8_experimental_extra_library_files")
// Flags for language modes and experimental language features.
DEFINE_BOOL(use_strict, false, "enforce strict mode")
DEFINE_BOOL(es_staging, false,
"enable test-worthy harmony features (for internal use only)")
DEFINE_BOOL(harmony, false, "enable all completed harmony features")
DEFINE_BOOL(harmony_shipping, true, "enable all shipped harmony features")
DEFINE_IMPLICATION(es_staging, harmony)
DEFINE_BOOL(legacy_const, false, "legacy semantics for const in sloppy mode")
// ES2015 const semantics are shipped
DEFINE_NEG_VALUE_IMPLICATION(harmony_shipping, legacy_const, true)
DEFINE_BOOL(promise_extra, true, "additional V8 Promise functions")
// Removing extra Promise functions is staged
DEFINE_NEG_IMPLICATION(harmony, promise_extra)
// Activate on ClusterFuzz.
DEFINE_IMPLICATION(es_staging, harmony_regexp_lookbehind)
DEFINE_IMPLICATION(es_staging, move_object_start)
DEFINE_IMPLICATION(es_staging, harmony_tailcalls)
// Features that are still work in progress (behind individual flags).
Restrict FunctionDeclarations in Statement position ES2015 generally bans FunctionDeclarations in positions which expect a Statement, as opposed to a StatementListItem, such as a FunctionDeclaration which constitutes the body of a for loop. However, Annex B 3.2 and 3.4 make exceptions for labeled function declarations and function declarations as the body of an if statement in sloppy mode, in the latter case specifying that the semantics are as if the function declaration occurred in a block. Chrome has historically permitted further extensions, for the body of any flow control construct. This patch addresses both the syntactic and semantic mismatches between V8 and the spec. For the semantic mismatch, function declarations as the body of if statements change from unconditionally hoisting in certain cases to acquiring the sloppy mode function in block semantics (based on Annex B 3.3). For the extra syntax permitted, this patch adds a flag, --harmony-restrictive-declarations, which excludes disallowed function declaration cases. A new UseCounter, LegacyFunctionDeclaration, is added to count how often function declarations occur as the body of other constructs in sloppy mode. With this patch, the code generally follows the form of the specification with respect to parsing FunctionDeclarations, rather than allowing them in arbitrary Statement positions, and makes it more clear where our extensions occur. BUG=v8:4647 R=adamk LOG=Y Review URL: https://codereview.chromium.org/1757543003 Cr-Commit-Position: refs/heads/master@{#34470}
2016-03-03 21:33:53 +00:00
#define HARMONY_INPROGRESS(V) \
V(harmony_object_observe, "harmony Object.observe") \
V(harmony_function_sent, "harmony function.sent") \
V(harmony_sharedarraybuffer, "harmony sharedarraybuffer") \
V(harmony_simd, "harmony simd") \
V(harmony_do_expressions, "harmony do-expressions") \
V(harmony_tailcalls, "harmony tail calls") \
V(harmony_regexp_property, "harmony unicode regexp property classes")
// Features that are complete (but still behind --harmony/es-staging flag).
#define HARMONY_STAGED(V) \
V(harmony_regexp_lookbehind, "harmony regexp lookbehind") \
V(harmony_instanceof, "harmony instanceof support") \
V(harmony_object_values_entries, "harmony Object.values / Object.entries") \
V(harmony_object_own_property_descriptors, \
"harmony Object.getOwnPropertyDescriptors()") \
// Features that are shipping (turned on by default, but internal flag remains).
#define HARMONY_SHIPPING(V) \
V(harmony_array_prototype_values, "harmony Array.prototype.values") \
V(harmony_function_name, "harmony Function name inference") \
V(harmony_iterator_close, "harmony iterator finalization") \
V(harmony_regexps, "harmony regular expression extensions") \
V(harmony_unicode_regexps, "harmony unicode regexps") \
V(harmony_sloppy, "harmony features in sloppy mode") \
V(harmony_sloppy_let, "harmony let in sloppy mode") \
V(harmony_sloppy_function, "harmony sloppy function block scoping") \
V(harmony_proxies, "harmony proxies") \
V(harmony_reflect, "harmony Reflect API") \
V(harmony_regexp_subclass, "harmony regexp subclassing") \
V(harmony_restrictive_declarations, \
"harmony limitations on sloppy mode function declarations") \
V(harmony_species, "harmony Symbol.species")
// Once a shipping feature has proved stable in the wild, it will be dropped
// from HARMONY_SHIPPING, all occurrences of the FLAG_ variable are removed,
// and associated tests are moved from the harmony directory to the appropriate
// esN directory.
#define FLAG_INPROGRESS_FEATURES(id, description) \
DEFINE_BOOL(id, false, "enable " #description " (in progress)")
HARMONY_INPROGRESS(FLAG_INPROGRESS_FEATURES)
#undef FLAG_INPROGRESS_FEATURES
#define FLAG_STAGED_FEATURES(id, description) \
DEFINE_BOOL(id, false, "enable " #description) \
DEFINE_IMPLICATION(harmony, id)
HARMONY_STAGED(FLAG_STAGED_FEATURES)
#undef FLAG_STAGED_FEATURES
#define FLAG_SHIPPING_FEATURES(id, description) \
DEFINE_BOOL(id, true, "enable " #description) \
DEFINE_NEG_NEG_IMPLICATION(harmony_shipping, id)
HARMONY_SHIPPING(FLAG_SHIPPING_FEATURES)
#undef FLAG_SHIPPING_FEATURES
// Feature dependencies.
DEFINE_IMPLICATION(harmony_sloppy_let, harmony_sloppy)
DEFINE_IMPLICATION(harmony_sloppy_function, harmony_sloppy)
// Flags for experimental implementation features.
DEFINE_BOOL(compiled_keyed_generic_loads, false,
"use optimizing compiler to generate keyed generic load stubs")
DEFINE_BOOL(allocation_site_pretenuring, true,
"pretenure with allocation sites")
DEFINE_BOOL(trace_pretenuring, false,
"trace pretenuring decisions of HAllocate instructions")
DEFINE_BOOL(trace_pretenuring_statistics, false,
"trace allocation site pretenuring statistics")
DEFINE_BOOL(track_fields, true, "track fields with only smi values")
DEFINE_BOOL(track_double_fields, true, "track fields with double values")
DEFINE_BOOL(track_heap_object_fields, true, "track fields with heap values")
DEFINE_BOOL(track_computed_fields, true, "track computed boilerplate fields")
DEFINE_IMPLICATION(track_double_fields, track_fields)
DEFINE_IMPLICATION(track_heap_object_fields, track_fields)
DEFINE_IMPLICATION(track_computed_fields, track_fields)
DEFINE_BOOL(track_field_types, true, "track field types")
DEFINE_IMPLICATION(track_field_types, track_fields)
DEFINE_IMPLICATION(track_field_types, track_heap_object_fields)
DEFINE_BOOL(smi_binop, true, "support smi representation in binary operations")
// Flags for optimization types.
DEFINE_BOOL(optimize_for_size, false,
"Enables optimizations which favor memory size over execution "
"speed")
DEFINE_VALUE_IMPLICATION(optimize_for_size, max_semi_space_size, 1)
// Flags for data representation optimizations
DEFINE_BOOL(unbox_double_arrays, true, "automatically unbox arrays of doubles")
DEFINE_BOOL(string_slices, true, "use string slices")
// Flags for Ignition.
DEFINE_BOOL(ignition, false, "use ignition interpreter")
DEFINE_STRING(ignition_filter, "*", "filter for ignition interpreter")
DEFINE_BOOL(print_bytecode, false,
"print bytecode generated by ignition interpreter")
[Interpreter] Add option to trace bytecode execution. Adds --trace-ignition flag which allows tracing of bytecodes as they execute. As well as printing out the bytecode, this also prints out the input and output registers to each operation. The generated output looks as follows: -> 0x350cb46d5264 (139) : 49 fc fb 03 07 Call r4, r5, #3, [7] [ accumulator -> 0x177fba00bc99 <JS Array[2]> ] [ r4 -> 0x350cb46ce099 <JS Function InstallFunctions (SharedFunctionInfo 0x350cb46470c1)> ] [ r5 -> 0x350cb46cddc1 <an Object with map 0x35fdf590a3a9> ] [ r6 -> 0x350cb46d3f11 <JS Function Proxy (SharedFunctionInfo 0x350cb46d3e61)> ] [ r7 -> 2 ] [ accumulator <- 0x350cb4604189 <undefined> ] -> 0x350cb46d5978 (47) : 4b f8 00 00 00 CallRuntime [248], r0, #0 [ accumulator -> 0x350cb4604189 <undefined> ] [ accumulator <- 0x350cb4604189 <undefined> ] -> 0x350cb46d597d (52) : 23 09 Ldar a0 [ accumulator -> 0x350cb4604189 <undefined> ] [ a0 -> 0x350cb46d3f11 <JS Function Proxy (SharedFunctionInfo 0x350cb46d3e61)> ] [ accumulator <- 0x350cb46d3f11 <JS Function Proxy (SharedFunctionInfo 0x350cb46d3e61)> ] -> 0x350cb46d597f (54) : 24 fd Star r3 [ accumulator -> 0x350cb46d3f11 <JS Function Proxy (SharedFunctionInfo 0x350cb46d3e61)> ] [ accumulator <- 0x350cb46d3f11 <JS Function Proxy (SharedFunctionInfo 0x350cb46d3e61)> ] [ r3 <- 0x350cb46d3f11 <JS Function Proxy (SharedFunctionInfo 0x350cb46d3e61)> ] Also adds support for --print_source and --print-ast to the interpreter. BUG=v8:4280 LOG=N Review URL: https://codereview.chromium.org/1640213002 Cr-Commit-Position: refs/heads/master@{#33594}
2016-01-28 18:17:30 +00:00
DEFINE_BOOL(trace_ignition, false,
"trace the bytecodes executed by the ignition interpreter")
DEFINE_BOOL(trace_ignition_codegen, false,
"trace the codegen of ignition interpreter bytecode handlers")
// Flags for Crankshaft.
DEFINE_BOOL(crankshaft, true, "use crankshaft")
DEFINE_STRING(hydrogen_filter, "*", "optimization filter")
DEFINE_BOOL(use_gvn, true, "use hydrogen global value numbering")
DEFINE_INT(gvn_iterations, 3, "maximum number of GVN fix-point iterations")
DEFINE_BOOL(use_canonicalizing, true, "use hydrogen instruction canonicalizing")
DEFINE_BOOL(use_inlining, true, "use function inlining")
DEFINE_BOOL(use_escape_analysis, true, "use hydrogen escape analysis")
DEFINE_BOOL(use_allocation_folding, true, "use allocation folding")
DEFINE_BOOL(use_local_allocation_folding, false, "only fold in basic blocks")
DEFINE_BOOL(use_write_barrier_elimination, true,
"eliminate write barriers targeting allocations in optimized code")
DEFINE_INT(max_inlining_levels, 5, "maximum number of inlining levels")
DEFINE_INT(max_inlined_source_size, 600,
"maximum source size in bytes considered for a single inlining")
DEFINE_INT(max_inlined_nodes, 196,
"maximum number of AST nodes considered for a single inlining")
DEFINE_INT(max_inlined_nodes_cumulative, 400,
"maximum cumulative number of AST nodes considered for inlining")
DEFINE_BOOL(loop_invariant_code_motion, true, "loop invariant code motion")
DEFINE_BOOL(fast_math, true, "faster (but maybe less accurate) math functions")
DEFINE_BOOL(collect_megamorphic_maps_from_stub_cache, false,
"crankshaft harvests type feedback from stub cache")
DEFINE_BOOL(hydrogen_stats, false, "print statistics for hydrogen")
DEFINE_BOOL(trace_check_elimination, false, "trace check elimination phase")
[turbofan] Variable liveness analysis for deopt. This change introduces a liveness analyzer for local variables in frame states. The main idea is to use the AstGraphBuilder::Environment class to build the control flow graph, and record local variable loads, stores and checkpoints in the CFG basic blocks (LivenessAnalyzerBlock class). After the graph building finishes, we run a simple data flow analysis over the CFG to figure out liveness of each local variable at each checkpoint. Finally, we run a pass over all the checkpoints and replace dead local variables in the frame states with the 'undefined' value. Performance numbers for Embenchen are below. ----------- box2d.js Current --turbo-deoptimization: EmbenchenBox2d(RunTime): 11265 ms. d8-master --turbo-deoptimization: EmbenchenBox2d(RunTime): 11768 ms. d8-master: EmbenchenBox2d(RunTime): 10996 ms. ----------- bullet.js Current --turbo-deoptimization: EmbenchenBullet(RunTime): 17049 ms. d8-master --turbo-deoptimization: EmbenchenBullet(RunTime): 17384 ms. d8-master: EmbenchenBullet(RunTime): 16153 ms. ----------- copy.js Current --turbo-deoptimization: EmbenchenCopy(RunTime): 4877 ms. d8-master --turbo-deoptimization: EmbenchenCopy(RunTime): 4938 ms. d8-master: EmbenchenCopy(RunTime): 4940 ms. ----------- corrections.js Current --turbo-deoptimization: EmbenchenCorrections(RunTime): 7068 ms. d8-master --turbo-deoptimization: EmbenchenCorrections(RunTime): 6718 ms. d8-master: EmbenchenCorrections(RunTime): 6858 ms. ----------- fannkuch.js Current --turbo-deoptimization: EmbenchenFannkuch(RunTime): 4167 ms. d8-master --turbo-deoptimization: EmbenchenFannkuch(RunTime): 4608 ms. d8-master: EmbenchenFannkuch(RunTime): 4149 ms. ----------- fasta.js Current --turbo-deoptimization: EmbenchenFasta(RunTime): 9981 ms. d8-master --turbo-deoptimization: EmbenchenFasta(RunTime): 9848 ms. d8-master: EmbenchenFasta(RunTime): 9640 ms. ----------- lua_binarytrees.js Current --turbo-deoptimization: EmbenchenLuaBinaryTrees(RunTime): 11571 ms. d8-master --turbo-deoptimization: EmbenchenLuaBinaryTrees(RunTime): 13089 ms. d8-master: EmbenchenLuaBinaryTrees(RunTime): 10957 ms. ----------- memops.js Current --turbo-deoptimization: EmbenchenMemOps(RunTime): 7766 ms. d8-master --turbo-deoptimization: EmbenchenMemOps(RunTime): 7346 ms. d8-master: EmbenchenMemOps(RunTime): 7738 ms. ----------- primes.js Current --turbo-deoptimization: EmbenchenPrimes(RunTime): 7459 ms. d8-master --turbo-deoptimization: EmbenchenPrimes(RunTime): 7453 ms. d8-master: EmbenchenPrimes(RunTime): 7451 ms. ----------- skinning.js Current --turbo-deoptimization: EmbenchenSkinning(RunTime): 15564 ms. d8-master --turbo-deoptimization: EmbenchenSkinning(RunTime): 15611 ms. d8-master: EmbenchenSkinning(RunTime): 15583 ms. ----------- zlib.js Current --turbo-deoptimization: EmbenchenZLib(RunTime): 10825 ms. d8-master --turbo-deoptimization: EmbenchenZLib(RunTime): 11180 ms. d8-master: EmbenchenZLib(RunTime): 10823 ms. BUG= Review URL: https://codereview.chromium.org/949743002 Cr-Commit-Position: refs/heads/master@{#27232}
2015-03-17 09:38:37 +00:00
DEFINE_BOOL(trace_environment_liveness, false,
"trace liveness of local variable slots")
DEFINE_BOOL(trace_hydrogen, false, "trace generated hydrogen to file")
DEFINE_STRING(trace_hydrogen_filter, "*", "hydrogen tracing filter")
DEFINE_BOOL(trace_hydrogen_stubs, false, "trace generated hydrogen for stubs")
DEFINE_STRING(trace_hydrogen_file, NULL, "trace hydrogen to given file name")
DEFINE_STRING(trace_phase, "HLZ", "trace generated IR for specified phases")
DEFINE_BOOL(trace_inlining, false, "trace inlining decisions")
DEFINE_BOOL(trace_load_elimination, false, "trace load elimination")
DEFINE_BOOL(trace_store_elimination, false, "trace store elimination")
DEFINE_BOOL(trace_alloc, false, "trace register allocator")
DEFINE_BOOL(trace_all_uses, false, "trace all use positions")
DEFINE_BOOL(trace_range, false, "trace range analysis")
DEFINE_BOOL(trace_gvn, false, "trace global value numbering")
DEFINE_BOOL(trace_representation, false, "trace representation types")
DEFINE_BOOL(trace_removable_simulates, false, "trace removable simulates")
DEFINE_BOOL(trace_escape_analysis, false, "trace hydrogen escape analysis")
DEFINE_BOOL(trace_allocation_folding, false, "trace allocation folding")
DEFINE_BOOL(trace_track_allocation_sites, false,
"trace the tracking of allocation sites")
DEFINE_BOOL(trace_migration, false, "trace object migration")
DEFINE_BOOL(trace_generalization, false, "trace map generalization")
DEFINE_BOOL(stress_pointer_maps, false, "pointer map for every instruction")
DEFINE_BOOL(stress_environments, false, "environment for every instruction")
DEFINE_INT(deopt_every_n_times, 0,
"deoptimize every n times a deopt point is passed")
DEFINE_INT(deopt_every_n_garbage_collections, 0,
"deoptimize every n garbage collections")
DEFINE_BOOL(print_deopt_stress, false, "print number of possible deopt points")
DEFINE_BOOL(trap_on_deopt, false, "put a break point before deoptimizing")
DEFINE_BOOL(trap_on_stub_deopt, false,
"put a break point before deoptimizing a stub")
DEFINE_BOOL(deoptimize_uncommon_cases, true, "deoptimize uncommon cases")
DEFINE_BOOL(polymorphic_inlining, true, "polymorphic inlining")
DEFINE_BOOL(use_osr, true, "use on-stack replacement")
DEFINE_BOOL(array_bounds_checks_elimination, true,
"perform array bounds checks elimination")
DEFINE_BOOL(trace_bce, false, "trace array bounds check elimination")
DEFINE_BOOL(array_bounds_checks_hoisting, false,
"perform array bounds checks hoisting")
DEFINE_BOOL(array_index_dehoisting, true, "perform array index dehoisting")
DEFINE_BOOL(analyze_environment_liveness, true,
"analyze liveness of environment slots and zap dead values")
DEFINE_BOOL(load_elimination, true, "use load elimination")
DEFINE_BOOL(check_elimination, true, "use check elimination")
DEFINE_BOOL(store_elimination, false, "use store elimination")
DEFINE_BOOL(dead_code_elimination, true, "use dead code elimination")
DEFINE_BOOL(fold_constants, true, "use constant folding")
DEFINE_BOOL(trace_dead_code_elimination, false, "trace dead code elimination")
DEFINE_BOOL(unreachable_code_elimination, true, "eliminate unreachable code")
DEFINE_BOOL(trace_osr, false, "trace on-stack replacement")
DEFINE_INT(stress_runs, 0, "number of stress runs")
DEFINE_BOOL(lookup_sample_by_shared, true,
"when picking a function to optimize, watch for shared function "
"info, not JSFunction itself")
DEFINE_BOOL(flush_optimized_code_cache, false,
"flushes the cache of optimized code for closures on every GC")
DEFINE_BOOL(inline_construct, true, "inline constructor calls")
DEFINE_BOOL(inline_arguments, true, "inline functions with arguments object")
DEFINE_BOOL(inline_accessors, true, "inline JavaScript accessors")
DEFINE_INT(escape_analysis_iterations, 2,
"maximum number of escape analysis fix-point iterations")
DEFINE_BOOL(concurrent_recompilation, true,
"optimizing hot functions asynchronously on a separate thread")
DEFINE_BOOL(trace_concurrent_recompilation, false,
"track concurrent recompilation")
DEFINE_INT(concurrent_recompilation_queue_length, 8,
"the length of the concurrent compilation queue")
DEFINE_INT(concurrent_recompilation_delay, 0,
"artificial compilation delay in ms")
DEFINE_BOOL(block_concurrent_recompilation, false,
"block queued jobs until released")
DEFINE_BOOL(omit_map_checks_for_leaf_maps, true,
"do not emit check maps for constant values that have a leaf map, "
"deoptimize the optimized code if the layout of the maps changes.")
// Flags for TurboFan.
DEFINE_BOOL(turbo, false, "enable TurboFan compiler")
DEFINE_IMPLICATION(turbo, turbo_asm_deoptimization)
DEFINE_BOOL(turbo_shipping, true, "enable TurboFan compiler on subset")
DEFINE_BOOL(turbo_greedy_regalloc, false, "use the greedy register allocator")
DEFINE_BOOL(turbo_sp_frame_access, false,
"use stack pointer-relative access to frame wherever possible")
[turbofan] Deferred blocks splintering. This change encompasses what is necessary to enable stack checks in loops without suffering large regressions. Primarily, it consists of a new mechanism for dealing with deferred blocks by "splintering", rather than splitting, inside deferred blocks. My initial change was splitting along deferred block boundaries, but the regression introduced by stackchecks wasn't resolved conclusively. After investigation, it appears that just splitting ranges along cold block boundaries leads to a greater opportunity for moves on the hot path, hence the suboptimal outcome. The alternative "splinters" ranges rather than splitting them. While splitting creates 2 ranges and links them (parent-child), in contrast, splintering creates a new independent range with no parent-child relation to the original. The original range appears as if it has a liveness hole in the place of the splintered one. All thus obtained ranges are then register allocated with no change to the register allocator. The splinters (cold blocks) do not conflict with the hot path ranges, by construction. The hot path ones have less pressure to split, because we remove a source of conflicts. After allocation, we merge the splinters back to their original ranges and continue the pipeline. We leverage the previous changes made for deferred blocks (determining where to spill, for example). Review URL: https://codereview.chromium.org/1305393003 Cr-Commit-Position: refs/heads/master@{#30357}
2015-08-25 14:47:26 +00:00
DEFINE_BOOL(turbo_preprocess_ranges, true,
"run pre-register allocation heuristics")
[turbofan] Deferred blocks splintering. This change encompasses what is necessary to enable stack checks in loops without suffering large regressions. Primarily, it consists of a new mechanism for dealing with deferred blocks by "splintering", rather than splitting, inside deferred blocks. My initial change was splitting along deferred block boundaries, but the regression introduced by stackchecks wasn't resolved conclusively. After investigation, it appears that just splitting ranges along cold block boundaries leads to a greater opportunity for moves on the hot path, hence the suboptimal outcome. The alternative "splinters" ranges rather than splitting them. While splitting creates 2 ranges and links them (parent-child), in contrast, splintering creates a new independent range with no parent-child relation to the original. The original range appears as if it has a liveness hole in the place of the splintered one. All thus obtained ranges are then register allocated with no change to the register allocator. The splinters (cold blocks) do not conflict with the hot path ranges, by construction. The hot path ones have less pressure to split, because we remove a source of conflicts. After allocation, we merge the splinters back to their original ranges and continue the pipeline. We leverage the previous changes made for deferred blocks (determining where to spill, for example). Review URL: https://codereview.chromium.org/1305393003 Cr-Commit-Position: refs/heads/master@{#30357}
2015-08-25 14:47:26 +00:00
DEFINE_BOOL(turbo_loop_stackcheck, true, "enable stack checks in loops")
DEFINE_STRING(turbo_filter, "~~", "optimization filter for TurboFan compiler")
DEFINE_BOOL(trace_turbo, false, "trace generated TurboFan IR")
DEFINE_BOOL(trace_turbo_graph, false, "trace generated TurboFan graphs")
DEFINE_IMPLICATION(trace_turbo_graph, trace_turbo)
DEFINE_STRING(trace_turbo_cfg_file, NULL,
"trace turbo cfg graph (for C1 visualizer) to a given file name")
DEFINE_BOOL(trace_turbo_types, true, "trace TurboFan's types")
DEFINE_BOOL(trace_turbo_scheduler, false, "trace TurboFan's scheduler")
DEFINE_BOOL(trace_turbo_reduction, false, "trace TurboFan's various reducers")
DEFINE_BOOL(trace_turbo_jt, false, "trace TurboFan's jump threading")
DEFINE_BOOL(trace_turbo_ceq, false, "trace TurboFan's control equivalence")
DEFINE_BOOL(turbo_asm, true, "enable TurboFan for asm.js code")
DEFINE_BOOL(turbo_asm_deoptimization, false,
"enable deoptimization in TurboFan for asm.js code")
DEFINE_BOOL(turbo_verify, DEBUG_BOOL, "verify TurboFan graphs at each phase")
DEFINE_BOOL(turbo_stats, false, "print TurboFan statistics")
DEFINE_BOOL(turbo_splitting, true, "split nodes during scheduling in TurboFan")
DEFINE_BOOL(turbo_types, true, "use typed lowering in TurboFan")
DEFINE_BOOL(turbo_source_positions, false,
"track source code positions when building TurboFan IR")
DEFINE_IMPLICATION(trace_turbo, turbo_source_positions)
DEFINE_BOOL(function_context_specialization, false,
"enable function context specialization in TurboFan")
DEFINE_BOOL(native_context_specialization, true,
"enable native context specialization in TurboFan")
DEFINE_BOOL(turbo_inlining, true, "enable inlining in TurboFan")
DEFINE_BOOL(trace_turbo_inlining, false, "trace TurboFan inlining")
DEFINE_BOOL(loop_assignment_analysis, true, "perform loop assignment analysis")
DEFINE_BOOL(turbo_profiling, false, "enable profiling in TurboFan")
DEFINE_BOOL(turbo_verify_allocation, DEBUG_BOOL,
"verify register allocation in TurboFan")
DEFINE_BOOL(turbo_move_optimization, true, "optimize gap moves in TurboFan")
DEFINE_BOOL(turbo_jt, true, "enable jump threading in TurboFan")
DEFINE_BOOL(turbo_osr, true, "enable OSR in TurboFan")
DEFINE_BOOL(turbo_stress_loop_peeling, false,
"stress loop peeling optimization")
DEFINE_BOOL(turbo_cf_optimization, true, "optimize control flow in TurboFan")
DEFINE_BOOL(turbo_frame_elision, true, "elide frames in TurboFan")
DEFINE_BOOL(turbo_cache_shared_code, true, "cache context-independent code")
DEFINE_BOOL(turbo_preserve_shared_code, false, "keep context-independent code")
DEFINE_BOOL(turbo_escape, false, "enable escape analysis")
DEFINE_BOOL(turbo_instruction_scheduling, false,
"enable instruction scheduling in TurboFan")
DEFINE_BOOL(turbo_stress_instruction_scheduling, false,
"randomly schedule instructions to stress dependency tracking")
// Flags for native WebAssembly.
DEFINE_BOOL(expose_wasm, false, "expose WASM interface to JavaScript")
DEFINE_BOOL(trace_wasm_encoder, false, "trace encoding of wasm code")
DEFINE_BOOL(trace_wasm_decoder, false, "trace decoding of wasm code")
DEFINE_BOOL(trace_wasm_decode_time, false, "trace decoding time of wasm code")
DEFINE_BOOL(trace_wasm_compiler, false, "trace compiling of wasm code")
DEFINE_BOOL(trace_wasm_ast, false, "dump AST after WASM decode")
DEFINE_BOOL(wasm_break_on_decoder_error, false,
"debug break when wasm decoder encounters an error")
DEFINE_BOOL(wasm_loop_assignment_analysis, false,
"perform loop assignment analysis for WASM")
DEFINE_BOOL(enable_simd_asmjs, false, "enable SIMD.js in asm.js stdlib")
DEFINE_BOOL(dump_asmjs_wasm, false, "dump Asm.js to WASM module bytes")
DEFINE_STRING(asmjs_wasm_dumpfile, "asmjs.wasm",
"file to dump asm wasm conversion result to")
DEFINE_INT(typed_array_max_size_in_heap, 64,
"threshold for in-heap typed array")
// Profiler flags.
DEFINE_INT(frame_count, 1, "number of stack frames inspected by the profiler")
// 0x1800 fits in the immediate field of an ARM instruction.
DEFINE_INT(interrupt_budget, 0x1800,
"execution budget before interrupt is triggered")
DEFINE_INT(type_info_threshold, 25,
"percentage of ICs that must have type info to allow optimization")
DEFINE_INT(generic_ic_threshold, 30,
"max percentage of megamorphic/generic ICs to allow optimization")
DEFINE_INT(self_opt_count, 130, "call count before self-optimization")
DEFINE_BOOL(trace_opt_verbose, false, "extra verbose compilation tracing")
DEFINE_IMPLICATION(trace_opt_verbose, trace_opt)
// assembler-ia32.cc / assembler-arm.cc / assembler-x64.cc
DEFINE_BOOL(debug_code, false, "generate extra code (assertions) for debugging")
DEFINE_BOOL(code_comments, false, "emit comments in code disassembly")
DEFINE_BOOL(enable_sse3, true, "enable use of SSE3 instructions if available")
DEFINE_BOOL(enable_sse4_1, true,
"enable use of SSE4.1 instructions if available")
DEFINE_BOOL(enable_sahf, true,
"enable use of SAHF instruction if available (X64 only)")
DEFINE_BOOL(enable_avx, true, "enable use of AVX instructions if available")
DEFINE_BOOL(enable_fma3, true, "enable use of FMA3 instructions if available")
DEFINE_BOOL(enable_bmi1, true, "enable use of BMI1 instructions if available")
DEFINE_BOOL(enable_bmi2, true, "enable use of BMI2 instructions if available")
DEFINE_BOOL(enable_lzcnt, true, "enable use of LZCNT instruction if available")
DEFINE_BOOL(enable_popcnt, true,
"enable use of POPCNT instruction if available")
DEFINE_BOOL(enable_vfp3, ENABLE_VFP3_DEFAULT,
"enable use of VFP3 instructions if available")
DEFINE_BOOL(enable_armv7, ENABLE_ARMV7_DEFAULT,
"enable use of ARMv7 instructions if available (ARM only)")
DEFINE_BOOL(enable_armv8, ENABLE_ARMV8_DEFAULT,
"enable use of ARMv8 instructions if available (ARM 32-bit only)")
DEFINE_BOOL(enable_neon, ENABLE_NEON_DEFAULT,
"enable use of NEON instructions if available (ARM only)")
DEFINE_BOOL(enable_sudiv, true,
"enable use of SDIV and UDIV instructions if available (ARM only)")
DEFINE_BOOL(enable_mls, true,
"enable use of MLS instructions if available (ARM only)")
DEFINE_BOOL(enable_movw_movt, false,
"enable loading 32-bit constant by means of movw/movt "
"instruction pairs (ARM only)")
DEFINE_BOOL(enable_unaligned_accesses, true,
"enable unaligned accesses for ARMv7 (ARM only)")
DEFINE_BOOL(enable_32dregs, ENABLE_32DREGS_DEFAULT,
"enable use of d16-d31 registers on ARM - this requires VFP3")
DEFINE_BOOL(enable_vldr_imm, false,
"enable use of constant pools for double immediate (ARM only)")
DEFINE_BOOL(force_long_branches, false,
"force all emitted branches to be in long mode (MIPS/PPC only)")
DEFINE_STRING(mcpu, "auto", "enable optimization for specific cpu")
DEFINE_IMPLICATION(enable_armv8, enable_vfp3)
DEFINE_IMPLICATION(enable_armv8, enable_neon)
DEFINE_IMPLICATION(enable_armv8, enable_32dregs)
DEFINE_IMPLICATION(enable_armv8, enable_sudiv)
DEFINE_IMPLICATION(enable_armv8, enable_mls)
// bootstrapper.cc
DEFINE_STRING(expose_natives_as, NULL, "expose natives in global object")
DEFINE_STRING(expose_debug_as, NULL, "expose debug in global object")
DEFINE_BOOL(expose_free_buffer, false, "expose freeBuffer extension")
DEFINE_BOOL(expose_gc, false, "expose gc extension")
DEFINE_STRING(expose_gc_as, NULL,
"expose gc extension under the specified name")
DEFINE_IMPLICATION(expose_gc_as, expose_gc)
DEFINE_BOOL(expose_externalize_string, false,
"expose externalize string extension")
DEFINE_BOOL(expose_trigger_failure, false, "expose trigger-failure extension")
DEFINE_INT(stack_trace_limit, 10, "number of stack frames to capture")
DEFINE_BOOL(builtins_in_stack_traces, false,
"show built-in functions in stack traces")
DEFINE_BOOL(disable_native_files, false, "disable builtin natives files")
// builtins-ia32.cc
DEFINE_BOOL(inline_new, true, "use fast inline allocation")
// codegen-ia32.cc / codegen-arm.cc
DEFINE_BOOL(trace_codegen, false,
"print name of functions for which code is generated")
DEFINE_BOOL(trace, false, "trace function calls")
DEFINE_BOOL(mask_constants_with_cookie, true,
"use random jit cookie to mask large constants")
// codegen.cc
DEFINE_BOOL(lazy, true, "use lazy compilation")
DEFINE_BOOL(trace_opt, false, "trace lazy optimization")
DEFINE_BOOL(trace_opt_stats, false, "trace lazy optimization statistics")
DEFINE_BOOL(opt, true, "use adaptive optimizations")
DEFINE_BOOL(always_opt, false, "always try to optimize functions")
DEFINE_BOOL(always_osr, false, "always try to OSR functions")
DEFINE_BOOL(prepare_always_opt, false, "prepare for turning on always opt")
DEFINE_BOOL(trace_deopt, false, "trace optimize function deoptimization")
DEFINE_BOOL(trace_stub_failures, false,
"trace deoptimization of generated code stubs")
DEFINE_BOOL(serialize_toplevel, true, "enable caching of toplevel scripts")
DEFINE_BOOL(serialize_eager, false, "compile eagerly when caching scripts")
DEFINE_BOOL(serialize_age_code, false, "pre age code in the code cache")
DEFINE_BOOL(trace_serializer, false, "print code serializer trace")
// compiler.cc
DEFINE_INT(min_preparse_length, 1024,
Initial infrastructure for fast compilation of top-level code. The fast code generator is optimized for compilation time and code size. Currently it is only implemented on IA32. It is potentially triggered for any code in the global scope (including code eval'd in the global scope). It performs a syntactic check and chooses to compile in fast mode if the AST contains only supported constructs and matches some other constraints. Initially supported constructs are * ExpressionStatement, * ReturnStatement, * VariableProxy (variable references) to parameters and stack-allocated locals, * Assignment with lhs a parameter or stack-allocated local, and * Literal This allows compilation of literals at the top level and not much else. All intermediate values are allocated to temporaries and the stack is used for all temporaries. The extra memory traffic is a known issue. The code generated for 'true' is: 0 push ebp 1 mov ebp,esp 3 push esi 4 push edi 5 push 0xf5cca135 ;; object: 0xf5cca135 <undefined> 10 cmp esp,[0x8277efc] 16 jnc 27 (0xf5cbbb1b) 22 call 0xf5cac960 ;; code: STUB, StackCheck, minor: 0 27 push 0xf5cca161 ;; object: 0xf5cca161 <true> 32 mov eax,[esp] 35 mov [ebp+0xf4],eax 38 pop eax 39 mov eax,[ebp+0xf4] 42 mov esp,ebp ;; js return 44 pop ebp 45 ret 0x4 48 mov eax,0xf5cca135 ;; object: 0xf5cca135 <undefined> 53 mov esp,ebp ;; js return 55 pop ebp 56 ret 0x4 Review URL: http://codereview.chromium.org/273050 git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@3067 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
2009-10-14 19:30:50 +00:00
"minimum length for automatic enable preparsing")
DEFINE_INT(max_opt_count, 10,
"maximum number of optimization attempts before giving up.")
// compilation-cache.cc
DEFINE_BOOL(compilation_cache, true, "enable compilation cache")
DEFINE_BOOL(cache_prototype_transitions, true, "cache prototype transitions")
Support higher CPU profiler sampling rate on posix systems New flag is added that allows to specify CPU profiler sampling rate in microseconds as command line argument. It was tested to work fine with 100us interval(currently it is 1ms). Default values are kept the same as in the current implementation. The new implementation is enabled only on POSIX platforms which use signals to collect samples. Other platforms that pause thread being sampled are to follow. SIGPROF signals are now sent on the profiler event processor thread to make sure that the processing thread does fall far behind the sampling. The patch is based on the previous one that was rolled out in r13851. The main difference is that the circular queue is not modified for now. On Linux sampling for CPU profiler is initiated on the profiler event processor thread, other platforms to follow. CPU profiler continues to use SamplingCircularQueue, we will probably replace it with a single sample buffer when Mac and Win ports support profiling on the event processing thread. When --prof option is specified profiling is initiated either on the profiler event processor thread if CPU profiler is on or on the SignalSender thread as it used to be if no CPU profiles are being collected. ProfilerEventsProcessor::ProcessEventsAndDoSample now waits in a tight loop, processing collected samples until sampling interval expires. To save CPU resources I'm planning to change that to use nanosleep as only one sample is expected in the queue at any point. BUG=v8:2814 R=bmeurer@chromium.org Review URL: https://codereview.chromium.org/21101002 git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@16310 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
2013-08-26 07:17:12 +00:00
// cpu-profiler.cc
DEFINE_INT(cpu_profiler_sampling_interval, 1000,
Support higher CPU profiler sampling rate on posix systems New flag is added that allows to specify CPU profiler sampling rate in microseconds as command line argument. It was tested to work fine with 100us interval(currently it is 1ms). Default values are kept the same as in the current implementation. The new implementation is enabled only on POSIX platforms which use signals to collect samples. Other platforms that pause thread being sampled are to follow. SIGPROF signals are now sent on the profiler event processor thread to make sure that the processing thread does fall far behind the sampling. The patch is based on the previous one that was rolled out in r13851. The main difference is that the circular queue is not modified for now. On Linux sampling for CPU profiler is initiated on the profiler event processor thread, other platforms to follow. CPU profiler continues to use SamplingCircularQueue, we will probably replace it with a single sample buffer when Mac and Win ports support profiling on the event processing thread. When --prof option is specified profiling is initiated either on the profiler event processor thread if CPU profiler is on or on the SignalSender thread as it used to be if no CPU profiles are being collected. ProfilerEventsProcessor::ProcessEventsAndDoSample now waits in a tight loop, processing collected samples until sampling interval expires. To save CPU resources I'm planning to change that to use nanosleep as only one sample is expected in the queue at any point. BUG=v8:2814 R=bmeurer@chromium.org Review URL: https://codereview.chromium.org/21101002 git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@16310 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
2013-08-26 07:17:12 +00:00
"CPU profiler sampling interval in microseconds")
// Array abuse tracing
DEFINE_BOOL(trace_js_array_abuse, false,
"trace out-of-bounds accesses to JS arrays")
DEFINE_BOOL(trace_external_array_abuse, false,
"trace out-of-bounds-accesses to external arrays")
DEFINE_BOOL(trace_array_abuse, false,
"trace out-of-bounds accesses to all arrays")
DEFINE_IMPLICATION(trace_array_abuse, trace_js_array_abuse)
DEFINE_IMPLICATION(trace_array_abuse, trace_external_array_abuse)
// debugger
DEFINE_BOOL(debug_eval_readonly_locals, true,
"do not update locals after debug-evaluate")
DEFINE_BOOL(trace_debug_json, false, "trace debugging JSON request/response")
DEFINE_BOOL(enable_liveedit, true, "enable liveedit experimental feature")
DEFINE_BOOL(hard_abort, true, "abort by crashing")
// execution.cc
DEFINE_INT(stack_size, V8_DEFAULT_STACK_SIZE_KB,
"default size of stack region v8 is allowed to use (in kBytes)")
// frames.cc
DEFINE_INT(max_stack_trace_source_length, 300,
"maximum length of function source code printed in a stack trace.")
// full-codegen.cc
DEFINE_BOOL(always_inline_smi_code, false,
"always inline smi code in non-opt code")
DEFINE_BOOL(verify_operand_stack_depth, false,
"emit debug code that verifies the static tracking of the operand "
"stack depth")
// heap.cc
DEFINE_INT(min_semi_space_size, 0,
"min size of a semi-space (in MBytes), the new space consists of two"
"semi-spaces")
DEFINE_INT(max_semi_space_size, 0,
"max size of a semi-space (in MBytes), the new space consists of two"
"semi-spaces")
DEFINE_INT(semi_space_growth_factor, 2, "factor by which to grow the new space")
DEFINE_BOOL(experimental_new_space_growth_heuristic, false,
"Grow the new space based on the percentage of survivors instead "
"of their absolute value.")
DEFINE_INT(max_old_space_size, 0, "max size of the old space (in Mbytes)")
DEFINE_INT(initial_old_space_size, 0, "initial old space size (in Mbytes)")
DEFINE_INT(max_executable_size, 0, "max size of executable memory (in Mbytes)")
DEFINE_BOOL(gc_global, false, "always perform global GCs")
DEFINE_INT(gc_interval, -1, "garbage collect after <n> allocations")
DEFINE_INT(retain_maps_for_n_gc, 2,
"keeps maps alive for <n> old space garbage collections")
DEFINE_BOOL(trace_gc, false,
"print one trace line following each garbage collection")
DEFINE_BOOL(trace_gc_nvp, false,
"print one detailed trace line in name=value format "
"after each garbage collection")
DEFINE_BOOL(trace_gc_ignore_scavenger, false,
"do not print trace line after scavenger collection")
DEFINE_BOOL(trace_idle_notification, false,
"print one trace line following each idle notification")
DEFINE_BOOL(trace_idle_notification_verbose, false,
"prints the heap state used by the idle notification")
DEFINE_BOOL(print_cumulative_gc_stat, false,
"print cumulative GC statistics in name=value format on exit")
DEFINE_BOOL(print_max_heap_committed, false,
"print statistics of the maximum memory committed for the heap "
"in name=value format on exit")
DEFINE_BOOL(trace_gc_verbose, false,
"print more details following each garbage collection")
DEFINE_INT(trace_allocation_stack_interval, -1,
"print stack trace after <n> free-list allocations")
DEFINE_BOOL(trace_fragmentation, false, "report fragmentation for old space")
DEFINE_BOOL(trace_fragmentation_verbose, false,
"report fragmentation for old space (detailed)")
DEFINE_BOOL(trace_mutator_utilization, false,
"print mutator utilization, allocation speed, gc speed")
DEFINE_BOOL(weak_embedded_maps_in_optimized_code, true,
"make maps embedded in optimized code weak")
DEFINE_BOOL(weak_embedded_objects_in_optimized_code, true,
"make objects embedded in optimized code weak")
DEFINE_BOOL(flush_code, true, "flush code that we expect not to use again")
DEFINE_BOOL(trace_code_flushing, false, "trace code flushing progress")
DEFINE_BOOL(age_code, true,
"track un-executed functions to age code and flush only "
"old code (required for code flushing)")
DEFINE_BOOL(incremental_marking, true, "use incremental marking")
DEFINE_INT(min_progress_during_incremental_marking_finalization, 32,
"keep finalizing incremental marking as long as we discover at "
"least this many unmarked objects")
DEFINE_INT(max_incremental_marking_finalization_rounds, 3,
"at most try this many times to finalize incremental marking")
DEFINE_BOOL(black_allocation, false, "use black allocation")
DEFINE_BOOL(concurrent_sweeping, true, "use concurrent sweeping")
DEFINE_BOOL(parallel_compaction, true, "use parallel compaction")
DEFINE_BOOL(parallel_pointer_update, true,
"use parallel pointer update during compaction")
DEFINE_BOOL(trace_incremental_marking, false,
"trace progress of the incremental marking")
DEFINE_BOOL(track_gc_object_stats, false,
"track object counts and memory usage")
DEFINE_BOOL(trace_gc_object_stats, false,
"trace object counts and memory usage")
DEFINE_IMPLICATION(trace_gc_object_stats, track_gc_object_stats)
DEFINE_BOOL(track_detached_contexts, true,
"track native contexts that are expected to be garbage collected")
DEFINE_BOOL(trace_detached_contexts, false,
"trace native contexts that are expected to be garbage collected")
DEFINE_IMPLICATION(trace_detached_contexts, track_detached_contexts)
#ifdef VERIFY_HEAP
DEFINE_BOOL(verify_heap, false, "verify heap pointers before and after GC")
#endif
DEFINE_BOOL(move_object_start, true, "enable moving of object starts")
DEFINE_BOOL(memory_reducer, true, "use memory reducer")
DEFINE_BOOL(scavenge_reclaim_unmodified_objects, false,
"remove unmodified and unreferenced objects")
DEFINE_INT(heap_growing_percent, 0,
"specifies heap growing factor as (1 + heap_growing_percent/100)")
// counters.cc
DEFINE_INT(histogram_interval, 600000,
"time interval in ms for aggregating memory histograms")
// global-handles.cc
DEFINE_BOOL(trace_object_groups, false,
"print object groups detected during each garbage collection")
// heap-snapshot-generator.cc
DEFINE_BOOL(heap_profiler_trace_objects, false,
"Dump heap object allocations/movements/size_updates")
// sampling-heap-profiler.cc
DEFINE_BOOL(sampling_heap_profiler_suppress_randomness, false,
"Use constant sample intervals to eliminate test flakiness")
// v8.cc
DEFINE_BOOL(use_idle_notification, true,
"Use idle notification to reduce memory footprint.")
// ic.cc
DEFINE_BOOL(use_ic, true, "use inline caching")
DEFINE_BOOL(trace_ic, false, "trace inline cache state transitions")
// macro-assembler-ia32.cc
DEFINE_BOOL(native_code_counters, false,
"generate extra code for manipulating stats counters")
// mark-compact.cc
DEFINE_BOOL(always_compact, false, "Perform compaction on every full GC")
DEFINE_BOOL(never_compact, false,
"Never perform compaction on full GC - testing only")
DEFINE_BOOL(compact_code_space, true, "Compact code space on full collections")
DEFINE_BOOL(cleanup_code_caches_at_gc, true,
"Flush inline caches prior to mark compact collection and "
"flush code caches in maps during mark compact cycle.")
DEFINE_BOOL(use_marking_progress_bar, true,
"Use a progress bar to scan large objects in increments when "
"incremental marking is active.")
DEFINE_BOOL(zap_code_space, DEBUG_BOOL,
"Zap free memory in code space with 0xCC while sweeping.")
DEFINE_INT(random_seed, 0,
"Default seed for initializing random generator "
"(0, the default, means to use system random).")
// objects.cc
DEFINE_BOOL(trace_weak_arrays, false, "Trace WeakFixedArray usage")
DEFINE_BOOL(track_prototype_users, false,
"Keep track of which maps refer to a given prototype object")
DEFINE_BOOL(trace_prototype_users, false,
"Trace updates to prototype user tracking")
DEFINE_BOOL(eliminate_prototype_chain_checks, true,
"Collapse prototype chain checks into single-cell checks")
DEFINE_IMPLICATION(eliminate_prototype_chain_checks, track_prototype_users)
DEFINE_BOOL(use_verbose_printer, true, "allows verbose printing")
DEFINE_BOOL(trace_for_in_enumerate, false, "Trace for-in enumerate slow-paths")
#if TRACE_MAPS
DEFINE_BOOL(trace_maps, false, "trace map creation")
#endif
// parser.cc
DEFINE_BOOL(allow_natives_syntax, false, "allow natives syntax")
DEFINE_BOOL(trace_parse, false, "trace parsing and preparsing")
// simulator-arm.cc, simulator-arm64.cc and simulator-mips.cc
DEFINE_BOOL(trace_sim, false, "Trace simulator execution")
DEFINE_BOOL(debug_sim, false, "Enable debugging the simulator")
DEFINE_BOOL(check_icache, false,
"Check icache flushes in ARM and MIPS simulator")
DEFINE_INT(stop_sim_at, 0, "Simulator stop after x number of instructions")
#if defined(V8_TARGET_ARCH_ARM64) || defined(V8_TARGET_ARCH_MIPS64) || \
defined(V8_TARGET_ARCH_PPC64)
DEFINE_INT(sim_stack_alignment, 16,
"Stack alignment in bytes in simulator. This must be a power of two "
"and it must be at least 16. 16 is default.")
#else
DEFINE_INT(sim_stack_alignment, 8,
"Stack alingment in bytes in simulator (4 or 8, 8 is default)")
#endif
DEFINE_INT(sim_stack_size, 2 * MB / KB,
"Stack size of the ARM64, MIPS64 and PPC64 simulator "
"in kBytes (default is 2 MB)")
DEFINE_BOOL(log_regs_modified, true,
"When logging register values, only print modified registers.")
[Interpreter] Add option to trace bytecode execution. Adds --trace-ignition flag which allows tracing of bytecodes as they execute. As well as printing out the bytecode, this also prints out the input and output registers to each operation. The generated output looks as follows: -> 0x350cb46d5264 (139) : 49 fc fb 03 07 Call r4, r5, #3, [7] [ accumulator -> 0x177fba00bc99 <JS Array[2]> ] [ r4 -> 0x350cb46ce099 <JS Function InstallFunctions (SharedFunctionInfo 0x350cb46470c1)> ] [ r5 -> 0x350cb46cddc1 <an Object with map 0x35fdf590a3a9> ] [ r6 -> 0x350cb46d3f11 <JS Function Proxy (SharedFunctionInfo 0x350cb46d3e61)> ] [ r7 -> 2 ] [ accumulator <- 0x350cb4604189 <undefined> ] -> 0x350cb46d5978 (47) : 4b f8 00 00 00 CallRuntime [248], r0, #0 [ accumulator -> 0x350cb4604189 <undefined> ] [ accumulator <- 0x350cb4604189 <undefined> ] -> 0x350cb46d597d (52) : 23 09 Ldar a0 [ accumulator -> 0x350cb4604189 <undefined> ] [ a0 -> 0x350cb46d3f11 <JS Function Proxy (SharedFunctionInfo 0x350cb46d3e61)> ] [ accumulator <- 0x350cb46d3f11 <JS Function Proxy (SharedFunctionInfo 0x350cb46d3e61)> ] -> 0x350cb46d597f (54) : 24 fd Star r3 [ accumulator -> 0x350cb46d3f11 <JS Function Proxy (SharedFunctionInfo 0x350cb46d3e61)> ] [ accumulator <- 0x350cb46d3f11 <JS Function Proxy (SharedFunctionInfo 0x350cb46d3e61)> ] [ r3 <- 0x350cb46d3f11 <JS Function Proxy (SharedFunctionInfo 0x350cb46d3e61)> ] Also adds support for --print_source and --print-ast to the interpreter. BUG=v8:4280 LOG=N Review URL: https://codereview.chromium.org/1640213002 Cr-Commit-Position: refs/heads/master@{#33594}
2016-01-28 18:17:30 +00:00
DEFINE_BOOL(log_colour, ENABLE_LOG_COLOUR,
"When logging, try to use coloured output.")
DEFINE_BOOL(ignore_asm_unimplemented_break, false,
"Don't break for ASM_UNIMPLEMENTED_BREAK macros.")
DEFINE_BOOL(trace_sim_messages, false,
"Trace simulator debug messages. Implied by --trace-sim.")
// isolate.cc
DEFINE_BOOL(stack_trace_on_illegal, false,
"print stack trace when an illegal exception is thrown")
DEFINE_BOOL(abort_on_uncaught_exception, false,
"abort program (dump core) when an uncaught exception is thrown")
DEFINE_BOOL(randomize_hashes, true,
"randomize hashes to avoid predictable hash collisions "
"(with snapshots this option cannot override the baked-in seed)")
DEFINE_INT(hash_seed, 0,
"Fixed seed to use to hash property keys (0 means random)"
"(with snapshots this option cannot override the baked-in seed)")
// runtime.cc
DEFINE_BOOL(runtime_call_stats, false, "report runtime call counts and times")
// snapshot-common.cc
DEFINE_BOOL(profile_deserialization, false,
"Print the time it takes to deserialize the snapshot.")
DEFINE_BOOL(serialization_statistics, false,
"Collect statistics on serialized objects.")
// Regexp
DEFINE_BOOL(regexp_optimization, true, "generate optimized regexp code")
// Testing flags test/cctest/test-{flags,api,serialization}.cc
DEFINE_BOOL(testing_bool_flag, true, "testing_bool_flag")
DEFINE_MAYBE_BOOL(testing_maybe_bool_flag, "testing_maybe_bool_flag")
DEFINE_INT(testing_int_flag, 13, "testing_int_flag")
DEFINE_FLOAT(testing_float_flag, 2.5, "float-flag")
DEFINE_STRING(testing_string_flag, "Hello, world!", "string-flag")
DEFINE_INT(testing_prng_seed, 42, "Seed used for threading test randomness")
#ifdef _WIN32
DEFINE_STRING(testing_serialization_file, "C:\\Windows\\Temp\\serdes",
"file in which to testing_serialize heap")
#else
DEFINE_STRING(testing_serialization_file, "/tmp/serdes",
"file in which to serialize heap")
#endif
// mksnapshot.cc
DEFINE_STRING(startup_src, NULL,
"Write V8 startup as C++ src. (mksnapshot only)")
DEFINE_STRING(startup_blob, NULL,
"Write V8 startup blob file. (mksnapshot only)")
// code-stubs-hydrogen.cc
DEFINE_BOOL(profile_hydrogen_code_stub_compilation, false,
"Print the time it takes to lazily compile hydrogen code stubs.")
DEFINE_BOOL(predictable, false, "enable predictable mode")
DEFINE_NEG_IMPLICATION(predictable, concurrent_recompilation)
DEFINE_NEG_IMPLICATION(predictable, concurrent_sweeping)
DEFINE_NEG_IMPLICATION(predictable, parallel_compaction)
DEFINE_NEG_IMPLICATION(predictable, memory_reducer)
// mark-compact.cc
DEFINE_BOOL(force_marking_deque_overflows, false,
"force overflows of marking deque by reducing it's size "
"to 64 words")
DEFINE_BOOL(stress_compaction, false,
"stress the GC compactor to flush out bugs (implies "
"--force_marking_deque_overflows)")
DEFINE_BOOL(manual_evacuation_candidates_selection, false,
"Test mode only flag. It allows an unit test to select evacuation "
"candidates pages (requires --stress_compaction).")
// api.cc
DEFINE_INT(external_allocation_limit_incremental_time, 1,
"Time spent in incremental marking steps (in ms) once the external "
"allocation limit is reached")
DEFINE_BOOL(disable_old_api_accessors, false,
"Disable old-style API accessors whose setters trigger through the "
"prototype chain")
//
// Dev shell flags
//
DEFINE_BOOL(help, false, "Print usage message, including flags, on console")
DEFINE_BOOL(dump_counters, false, "Dump counters on exit")
DEFINE_STRING(map_counters, "", "Map counters to a file")
DEFINE_ARGS(js_arguments,
"Pass all remaining arguments to the script. Alias for \"--\".")
//
// GDB JIT integration flags.
//
#undef FLAG
#ifdef ENABLE_GDB_JIT_INTERFACE
#define FLAG FLAG_FULL
#else
#define FLAG FLAG_READONLY
#endif
DEFINE_BOOL(gdbjit, false, "enable GDBJIT interface")
DEFINE_BOOL(gdbjit_full, false, "enable GDBJIT interface for all code objects")
DEFINE_BOOL(gdbjit_dump, false, "dump elf objects with debug info to disk")
DEFINE_STRING(gdbjit_dump_filter, "",
"dump only objects containing this substring")
#ifdef ENABLE_GDB_JIT_INTERFACE
DEFINE_IMPLICATION(gdbjit_full, gdbjit)
DEFINE_IMPLICATION(gdbjit_dump, gdbjit)
#endif
DEFINE_NEG_IMPLICATION(gdbjit, compact_code_space)
//
// Debug only flags
//
#undef FLAG
#ifdef DEBUG
#define FLAG FLAG_FULL
#else
#define FLAG FLAG_READONLY
#endif
// checks.cc
#ifdef ENABLE_SLOW_DCHECKS
DEFINE_BOOL(enable_slow_asserts, false,
"enable asserts that are slow to execute")
#endif
// codegen-ia32.cc / codegen-arm.cc / macro-assembler-*.cc
DEFINE_BOOL(print_source, false, "pretty print source code")
DEFINE_BOOL(print_builtin_source, false,
"pretty print source code for builtins")
DEFINE_BOOL(print_ast, false, "print source AST")
DEFINE_BOOL(print_builtin_ast, false, "print source AST for builtins")
DEFINE_BOOL(trap_on_abort, false, "replace aborts by breakpoints")
// compiler.cc
DEFINE_BOOL(print_builtin_scopes, false, "print scopes for builtins")
DEFINE_BOOL(print_scopes, false, "print scopes")
// contexts.cc
DEFINE_BOOL(trace_contexts, false, "trace contexts operations")
// heap.cc
DEFINE_BOOL(gc_verbose, false, "print stuff during garbage collection")
DEFINE_BOOL(heap_stats, false, "report heap statistics before and after GC")
DEFINE_BOOL(code_stats, false, "report code statistics after GC")
DEFINE_BOOL(print_handles, false, "report handles after GC")
DEFINE_BOOL(check_handle_count, false,
"Check that there are not too many handles at GC")
DEFINE_BOOL(print_global_handles, false, "report global handles after GC")
// TurboFan debug-only flags.
DEFINE_BOOL(print_turbo_replay, false,
"print C++ code to recreate TurboFan graphs")
DEFINE_BOOL(trace_turbo_escape, false, "enable tracing in escape analysis")
// objects.cc
DEFINE_BOOL(trace_normalization, false,
"prints when objects are turned into dictionaries.")
// runtime.cc
DEFINE_BOOL(trace_lazy, false, "trace lazy compilation")
// spaces.cc
DEFINE_BOOL(collect_heap_spill_statistics, false,
"report heap spill statistics along with heap_stats "
"(requires heap_stats)")
DEFINE_BOOL(trace_live_bytes, false,
"trace incrementing and resetting of live bytes")
DEFINE_BOOL(trace_isolates, false, "trace isolate state changes")
// Regexp
DEFINE_BOOL(regexp_possessive_quantifier, false,
"enable possessive quantifier syntax for testing")
DEFINE_BOOL(trace_regexp_bytecodes, false, "trace regexp bytecode execution")
DEFINE_BOOL(trace_regexp_assembler, false,
"trace regexp macro assembler calls.")
DEFINE_BOOL(trace_regexp_parser, false, "trace regexp parsing")
// Debugger
DEFINE_BOOL(print_break_location, false, "print source location on debug break")
//
// Logging and profiling flags
//
#undef FLAG
#define FLAG FLAG_FULL
// log.cc
DEFINE_BOOL(log, false,
"Minimal logging (no API, code, GC, suspect, or handles samples).")
DEFINE_BOOL(log_all, false, "Log all events to the log file.")
DEFINE_BOOL(log_api, false, "Log API events to the log file.")
DEFINE_BOOL(log_code, false,
"Log code events to the log file without profiling.")
DEFINE_BOOL(log_gc, false,
"Log heap samples on garbage collection for the hp2ps tool.")
DEFINE_BOOL(log_handles, false, "Log global handle events.")
DEFINE_BOOL(log_snapshot_positions, false,
"log positions of (de)serialized objects in the snapshot.")
DEFINE_BOOL(log_suspect, false, "Log suspect operations.")
DEFINE_BOOL(prof, false,
"Log statistical profiling information (implies --log-code).")
DEFINE_BOOL(prof_cpp, false, "Like --prof, but ignore generated code.")
DEFINE_IMPLICATION(prof, prof_cpp)
DEFINE_BOOL(prof_browser_mode, true,
"Used with --prof, turns on browser-compatible mode for profiling.")
DEFINE_BOOL(log_regexp, false, "Log regular expression execution.")
DEFINE_STRING(logfile, "v8.log", "Specify the name of the log file.")
DEFINE_BOOL(logfile_per_isolate, true, "Separate log files for each isolate.")
DEFINE_BOOL(ll_prof, false, "Enable low-level linux profiler.")
DEFINE_BOOL(perf_basic_prof, false,
"Enable perf linux profiler (basic support).")
DEFINE_NEG_IMPLICATION(perf_basic_prof, compact_code_space)
DEFINE_BOOL(perf_basic_prof_only_functions, false,
"Only report function code ranges to perf (i.e. no stubs).")
DEFINE_IMPLICATION(perf_basic_prof_only_functions, perf_basic_prof)
DEFINE_STRING(gc_fake_mmap, "/tmp/__v8_gc__",
"Specify the name of the file for fake gc mmap used in ll_prof")
DEFINE_BOOL(log_internal_timer_events, false, "Time internal events.")
DEFINE_BOOL(log_timer_events, false,
"Time events including external callbacks.")
DEFINE_IMPLICATION(log_timer_events, log_internal_timer_events)
DEFINE_IMPLICATION(log_internal_timer_events, prof)
DEFINE_BOOL(log_instruction_stats, false, "Log AArch64 instruction statistics.")
DEFINE_STRING(log_instruction_file, "arm64_inst.csv",
"AArch64 instruction statistics log file.")
DEFINE_INT(log_instruction_period, 1 << 22,
"AArch64 instruction statistics logging period.")
DEFINE_BOOL(redirect_code_traces, false,
"output deopt information and disassembly into file "
"code-<pid>-<isolate id>.asm")
DEFINE_STRING(redirect_code_traces_to, NULL,
"output deopt information and disassembly into the given file")
DEFINE_BOOL(hydrogen_track_positions, false,
"track source code positions when building IR")
//
// Disassembler only flags
//
#undef FLAG
#ifdef ENABLE_DISASSEMBLER
#define FLAG FLAG_FULL
#else
#define FLAG FLAG_READONLY
#endif
// elements.cc
DEFINE_BOOL(trace_elements_transitions, false, "trace elements transitions")
DEFINE_BOOL(trace_creation_allocation_sites, false,
"trace the creation of allocation sites")
// code-stubs.cc
DEFINE_BOOL(print_code_stubs, false, "print code stubs")
DEFINE_BOOL(test_secondary_stub_cache, false,
"test secondary stub cache by disabling the primary one")
DEFINE_BOOL(test_primary_stub_cache, false,
"test primary stub cache by disabling the secondary one")
// codegen-ia32.cc / codegen-arm.cc
DEFINE_BOOL(print_code, false, "print generated code")
DEFINE_BOOL(print_opt_code, false, "print optimized code")
DEFINE_BOOL(print_unopt_code, false,
"print unoptimized code before "
"printing optimized code based on it")
DEFINE_BOOL(print_code_verbose, false, "print more information for code")
DEFINE_BOOL(print_builtin_code, false, "print generated code for builtins")
#ifdef ENABLE_DISASSEMBLER
DEFINE_BOOL(sodium, false,
"print generated code output suitable for use with "
"the Sodium code viewer")
DEFINE_IMPLICATION(sodium, print_code_stubs)
DEFINE_IMPLICATION(sodium, print_code)
DEFINE_IMPLICATION(sodium, print_opt_code)
DEFINE_IMPLICATION(sodium, hydrogen_track_positions)
DEFINE_IMPLICATION(sodium, code_comments)
DEFINE_BOOL(print_all_code, false, "enable all flags related to printing code")
DEFINE_IMPLICATION(print_all_code, print_code)
DEFINE_IMPLICATION(print_all_code, print_opt_code)
DEFINE_IMPLICATION(print_all_code, print_unopt_code)
DEFINE_IMPLICATION(print_all_code, print_code_verbose)
DEFINE_IMPLICATION(print_all_code, print_builtin_code)
DEFINE_IMPLICATION(print_all_code, print_code_stubs)
DEFINE_IMPLICATION(print_all_code, code_comments)
#ifdef DEBUG
DEFINE_IMPLICATION(print_all_code, trace_codegen)
#endif
#endif
//
// VERIFY_PREDICTABLE related flags
//
#undef FLAG
#ifdef VERIFY_PREDICTABLE
#define FLAG FLAG_FULL
#else
#define FLAG FLAG_READONLY
#endif
DEFINE_BOOL(verify_predictable, false,
"this mode is used for checking that V8 behaves predictably")
DEFINE_INT(dump_allocations_digest_at_alloc, -1,
"dump allocations digest each n-th allocation")
//
// Read-only flags
//
#undef FLAG
#define FLAG FLAG_READONLY
// assembler.h
DEFINE_BOOL(enable_embedded_constant_pool, V8_EMBEDDED_CONSTANT_POOL,
"enable use of embedded constant pools (ARM/PPC only)")
DEFINE_BOOL(unbox_double_fields, V8_DOUBLE_FIELDS_UNBOXING,
"enable in-object double fields unboxing (64-bit only)")
DEFINE_IMPLICATION(unbox_double_fields, track_double_fields)
DEFINE_BOOL(global_var_shortcuts, false, "use ic-less global loads and stores")
// Cleanup...
#undef FLAG_FULL
#undef FLAG_READONLY
#undef FLAG
#undef FLAG_ALIAS
#undef DEFINE_BOOL
#undef DEFINE_MAYBE_BOOL
#undef DEFINE_INT
#undef DEFINE_STRING
#undef DEFINE_FLOAT
#undef DEFINE_ARGS
#undef DEFINE_IMPLICATION
#undef DEFINE_NEG_IMPLICATION
#undef DEFINE_NEG_VALUE_IMPLICATION
#undef DEFINE_VALUE_IMPLICATION
#undef DEFINE_ALIAS_BOOL
#undef DEFINE_ALIAS_INT
#undef DEFINE_ALIAS_STRING
#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