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//"use strict";
// Tuning
var QUANTUM_SIZE = 4; // This is the size of an individual field in a structure. 1 would
// lead to e.g. doubles and chars both taking 1 memory address. This
// is a form of 'compressed' memory, with shrinking and stretching
// according to the type, when compared to C/C++. On the other hand
// the normal value of 4 means all fields take 4 memory addresses,
// as per the norm on a 32-bit machine.
//
// 1 is somewhat faster than 4, but dangerous.
var CORRECT_SIGNS = 1; // Whether we make sure to convert unsigned values to signed values.
// Decreases performance with additional runtime checks. Might not be
// needed in some kinds of code.
// If equal to 2, done on a line-by-line basis according to
// CORRECT_SIGNS_LINES, correcting only the specified lines.
// If equal to 3, correcting all *but* the specified lines
var CHECK_SIGNS = 0; // Runtime errors for signing issues that need correcting.
// It is recommended to use this in
// order to find if your code needs CORRECT_SIGNS. If you can get your
// code to run without CORRECT_SIGNS, it will run much faster
var ASSERTIONS = 1; // Whether we should add runtime assertions, for example to
// check that each allocation to the stack does not
// exceed it's size, whether all allocations (stack and static) are
// of positive size, etc., whether we should throw if we encounter a bad __label__, i.e.,
// if code flow runs into a fault
var INVOKE_RUN = 1; // Whether we will call run(). Disable if you embed the generated
// code in your own, and will call run() yourself at the right time
var INIT_STACK = 1; // Whether to initialize memory on the stack to 0.
var INIT_HEAP = 0; // Whether to initialize memory anywhere other than the stack to 0.
var FAST_MEMORY = 2*1024*1024; // The amount of memory to initialize to 0. This ensures it will be
// in a flat array. This only matters in non-typed array builds.
var TOTAL_MEMORY = 50*1024*1024; // The total amount of memory to use. This mainly matters in
// typed array builds - accessing memory about this value will
// return undefined values and lead to serious problems, and there
// is currently no warning about that!
// Code embetterments
var MICRO_OPTS = 0; // Various micro-optimizations, like nativizing variables
var RELOOP = 0; // Recreate js native loops from llvm data
var USE_TYPED_ARRAYS = 0; // Try to use typed arrays for the heap
// 1 has two heaps, IHEAP (int32) and FHEAP (double),
// and addresses there are a match for normal addresses. This wastes memory but can be fast.
// 2 is a single heap, accessible through views as int8, int32, etc. This saves memory but
// has more overhead of pointer calculations. It also is limited to storing doubles as floats,
// simply because double stores are not necessarily 64-bit aligned, and we can only access
// 64-bit aligned values with a 64-bit typed array. Likewise int64s are stored as int32's,
// which is potentially very dangerous!
// TODO: require compiling with -malign-double, which does align doubles
var USE_FHEAP = 1; // Relevant in USE_TYPED_ARRAYS == 1. If this is disabled, only IHEAP will be used, and FHEAP
// not generated at all. This is useful if your code is 100% ints without floats or doubles
var I64_MODE = 0; // How to implement 64-bit integers:
// 0: As doubles. This will work up to about 53 bits.
// 1: As [low, high]. This will support all 64 bits for bit ops, etc. properly, but will still
// use doubles for addition etc., like mode 0. This mode is slower than
// mode 0, so its only benefit is proper support for 64 bit bitops.
// TODO: Full bignum support
var EMULATE_UNALIGNED_ACCESSES = 1; // If set, the compiler will 'emulate' loads and stores that are not known to
// be sufficiently aligned, by working on individual bytes. This can be
// important in USE_TYPED_ARRAYS == 2, where unaligned accesses do not work,
// specifically in the case where unsafe LLVM optimizations have generated possibly
// unaligned code. (Without unsafe LLVM optimizations, there should be no
// need for this option.)
// Currently this only works for integers, not doubles and floats.
var SKIP_STACK_IN_SMALL = 1; // When enabled, does not push/pop the stack at all in
// functions that have no basic stack usage. But, they
// may allocate stack later, and in a loop, this can be
// very bad. In particular, when debugging, printf()ing
// a lot can exhaust the stack very fast, with this option.
// In particular, be careful with the autodebugger!
var INLINE_LIBRARY_FUNCS = 1; // Will inline library functions that have __inline defined
var CLOSURE_INLINE_PREVENTION_LINES = 50; // Functions of this number of lines or larger will have
// code generated that tells the closure compiler not to
// inline them. This is useful to prevent the generation of
// overly large functions.
// Generated code debugging options
var SAFE_HEAP = 0; // Check each write to the heap against a list of blocked addresses
// If equal to 2, done on a line-by-line basis according to
// SAFE_HEAP_LINES, checking only the specified lines.
// If equal to 3, checking all *but* the specified lines. Note
// that 3 is the option you usually want here.
var SAFE_HEAP_LOG = 0; // Log out all SAFE_HEAP operations
var LABEL_DEBUG = 0; // Print out labels and functions as we enter them
var EXCEPTION_DEBUG = 1; // Print out exceptions in emscriptened code
var LIBRARY_DEBUG = 0; // Print out when we enter a library call (library*.js)
var DISABLE_EXCEPTION_CATCHING = 0; // Disables generating code to actually catch exceptions. If the code you
// are compiling does not actually rely on catching exceptions (but the
// compiler generates code for it, maybe because of stdlibc++ stuff),
// then this can make it much faster. If an exception actually happens,
// it will not be caught and the program will halt (so this will not
// introduce silent failures, which is good).
// TODO: Make this also remove cxa_begin_catch etc., optimize relooper
// for it, etc. (perhaps do all of this as preprocessing on .ll?)
var EXECUTION_TIMEOUT = -1; // Throw an exception after X seconds - useful to debug infinite loops
var CHECK_OVERFLOWS = 0; // Add code that checks for overflows in integer math operations.
// There is currently not much to do to handle overflows if they occur.
// We can add code to simulate i32/i64 overflows in JS, but that would
// be very slow. It probably makes more sense to avoid overflows in
// C/C++ code. For example, if you have an int that you multiply by
// some factor, in order to get 'random' hash values - by taking
// that |value & hash_table_size| - then multiplying enough times will overflow.
// But instead, you can do |value = value & 30_BITS| in each iteration.
var CHECK_SIGNED_OVERFLOWS = 0; // Whether to allow *signed* overflows - our correction for overflows generates signed
// values (since we use &). This means that we correct some things are not strictly overflows,
// and we cause them to be signed (which may lead to unnecessary unSign()ing later).
// With this enabled, we check signed overflows for CHECK_OVERFLOWS
var CORRECT_OVERFLOWS = 1; // Experimental code that tries to prevent unexpected JS overflows in integer
// mathops, by doing controlled overflows (sort of parallel to a CPU).
// Note that as mentioned above in CHECK_OVERFLOWS, the best thing is to
// not rely on overflows in your C/C++ code, as even if this option works,
// it slows things down.
//
// If equal to 2, done on a line-by-line basis according to
// CORRECT_OVERFLOWS_LINES, correcting only the specified lines.
// If equal to 3, correcting all *but* the specified lines
//
// NOTE: You can introduce signing issues by using this option. If you
// take a large enough 32-bit value, and correct it for overflows,
// you may get a negative number, as JS & operations are signed.
var CORRECT_ROUNDINGS = 1; // C rounds to 0 (-5.5 to -5, +5.5 to 5), while JS has no direct way to do that:
// Math.floor is to negative, ceil to positive. With CORRECT_ROUNDINGS,
// we will do slow but correct C rounding operations.
var PGO = 0; // Profile-guided optimization.
// When run with the CHECK_* options, will not fail on errors. Instead, will
// keep a record of which checks succeeded and which failed. On shutdown, will
// print out that information. This is useful for knowing which lines need
// checking enabled and which do not, that is, this is a way to automate the
// generation of line data for CORRECT_*_LINES options.
// All CORRECT_* options default to 1 with PGO builds.
// See https://github.com/kripken/emscripten/wiki/Optimizing-Code for more info
var PROFILE = 0; // Enables runtime profiling. See test_profiling for a usage example.
var EXPORTED_FUNCTIONS = ['_main']; // Functions that are explicitly exported, so they are guaranteed to
// be accessible outside of the generated code.
var IGNORED_FUNCTIONS = []; // Functions that we should not generate, neither a stub nor a complete function.
// This is useful if your project code includes a function, and you want to replace
// that in the compiled code with your own handwritten JS. (Of course even without
// this option, you could just override the generated function at runtime. However,
// JS engines might optimize better if the function is defined once in a single
// place in your code.)
var EXPORTED_GLOBALS = []; // Global non-function variables that are explicitly
// exported, so they are guaranteed to be
// accessible outside of the generated code.
var INCLUDE_FULL_LIBRARY = 0; // Whether to include the whole library rather than just the
// functions used by the generated code. This is needed when
// dynamically loading modules that make use of runtime
// library functions that are not used in the main module.
// A set of defines, for example generated from your header files. This
// lets the emscripten libc (library.js) see the right values.
// The default value here has been generated from system/include. If you
// modify those files, or use different headers, you will need to override
// this.
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var SHOW_LABELS = 0; // Show labels in the generated code
var BUILD_AS_SHARED_LIB = 0; // Whether to build the code as a shared library, which
// must be loaded dynamically using dlopen().
var RUNTIME_TYPE_INFO = 0; // Whether to expose type info to the script at run time. This
// increases the size of the generated script, but allows you
// to more easily perform operations from handwritten JS on
// objects with structures etc.
var FAKE_X86_FP80 = 0; // Replaces x86_fp80 with double. This loses precision. It is better,
// if you can, to get the original source code to build without x86_fp80
// (which is nonportable anyhow).
// Compiler debugging options
var DEBUG_TAGS_SHOWING = [];
// Some useful items:
// framework
// frameworkLines
// gconst
// types
// vars
// relooping
// unparsedFunctions
// metadata
|
