Alex Crichton bec7b766fb rustc: Move to FNV hashing for node/def ids
This leverages the new hashing framework and hashmap implementation to provide a
much speedier hashing algorithm for node ids and def ids. The hash algorithm
used is currentl FNV hashing, but it's quite easy to swap out.

I originally implemented hashing as the identity function, but this actually
ended up in slowing down rustc compiling libstd from 8s to 13s. I would suspect
that this is a result of a large number of collisions.

With FNV hashing, we get these timings (compiling with --no-trans, in seconds):

|           |  before  |  after  |
|-----------|---------:|--------:|
| libstd    |   8.324  |  6.703  |
| stdtest   |  47.674  | 46.857  |
| libsyntax |   9.918  |  8.400  |
2014-03-06 17:45:48 -08:00
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This is a preliminary version of the Rust compiler, libraries and tools.

Source layout:

Path Description
librustc/ The self-hosted compiler
libstd/ The standard library (imported and linked by default)
libextra/ The "extras" library (slightly more peripheral code)
libgreen/ The M:N runtime library
libnative/ The 1:1 runtime library
libsyntax/ The Rust parser and pretty-printer
libcollections/ A collection of useful data structures and containers
libnum/ Extended number support library (complex, rational, etc)
libtest/ Rust's test-runner code
------------------- ---------------------------------------------------------
libarena/ The arena (a fast but limited) memory allocator
libflate/ Simple compression library
libfourcc/ Data format identifier library
libgetopts/ Get command-line-options library
libglob/ Unix glob patterns library
libsemver/ Rust's semantic versioning library
libserialize/ Encode-Decode types library
libsync/ Concurrency mechanisms and primitives
libterm/ ANSI color library for terminals
libtime/ Time operations library
libuuid/ UUID's handling code
------------------- ---------------------------------------------------------
rt/ The runtime system
rt/rust_*.c - Some of the runtime services
rt/vg - Valgrind headers
rt/msvc - MSVC support
rt/sundown - The Markdown library used by rustdoc
------------------- ---------------------------------------------------------
compiletest/ The test runner
test/ Testsuite
test/codegen - Tests for the LLVM IR infrastructure
test/compile-fail - Tests that should fail to compile
test/debug-info - Tests for the debuginfo tool
test/run-fail - Tests that should compile, run and fail
test/run-make - Tests that depend on a Makefile infrastructure
test/run-pass - Tests that should compile, run and succeed
test/bench - Benchmarks and miscellaneous
test/pretty - Pretty-printer tests
test/auxiliary - Dependencies of tests
------------------- ---------------------------------------------------------
librustdoc/ The Rust API documentation tool
libuv/ The libuv submodule
librustuv/ Rust libuv support code
------------------- ---------------------------------------------------------
llvm/ The LLVM submodule
rustllvm/ LLVM support code
------------------- ---------------------------------------------------------
etc/ Scripts, editors support, misc

NOTE: This list (especially the second part of the table which contains modules and libraries) is highly volatile and subject to change.