Remove compiler switches from $(TOPLEVEL)/deps/v8/build/common.gypi,
we set them globally in $(TOPLEVEL)/common.gypi.
Commit 7b4d95a introduced the switches again, resulting in V8 getting
built without any optimizations.
This commit is essentially a rehash of commit 4b8629d.
The int8_t and uint8_t typedefs on sunos/smartos depend on a number of
compiler directives. Avoid ambiguity and specify signed and unsigned
char explicitly.
Fixes the following build error:
../src/stream_wrap.cc: In static member function 'static void*
node::WriteWrap::operator new(size_t)':
../src/stream_wrap.cc:70:49: warning: no return statement in function
returning non-void [-Wreturn-type]
In file included from ../src/v8_typed_array.cc:26:0:
../src/v8_typed_array_bswap.h: In function 'T
v8_typed_array::SwapBytes(T) [with T = signed char]':
../src/v8_typed_array_bswap.h:150:23: instantiated from 'T
v8_typed_array::LoadAndSwapBytes(void*) [with T = signed char]'
../src/v8_typed_array.cc:694:7: instantiated from 'static
v8::Handle<v8::Value> {anonymous}::DataView::getGeneric(const
v8::Arguments&) [with T = signed char]'
../src/v8_typed_array.cc:738:40: instantiated from here
../src/v8_typed_array_bswap.h:125:16: error: size of array is
negative
For example, to cross-compile from my OS X laptop for Raspberry Pi, you would
do something like:
$ make binary BINARYNAME=node-v`python tools/getnodeversion.py`-linux-arm-pi \
DESTCPU=arm CONFIG_FLAGS="--dest-os=linux"
This also slightly changes the semantics, in that a 'readable'
event may be triggered by the first write() call, even if a
user has not yet called read().
This happens because the Transform _write() handler is calling
read(0) to start the flow of data. Technically, the new behavior
is more 'correct', since it is more in line with the semantics
of the 'readable' event in other streams.
Implement load and store swizzling operations. This reduces an unneeded
back and forth between types and additionally keeps the value in the
swappable type until it is swapped. This is important for correctness
when dealing with floating point, to avoid the possibility of loading
the bits of a signaling NaN (because it isn't yet swapped) into the FPU.
This additionally produces better code (comments are mine):
gcc version 4.2.1 (Based on Apple Inc. build 5658) (LLVM build 2336.11.00)
setValue<double>:
movd %xmm0, %rax ; fp reg -> gen reg
bswapq %rax ; 64-bit byte swap
movq %rax, (%r15,%r12) ; store
Implement swizzling with compiler intrinsics and be aware of the native
endianness to correctly swap on big endian machines.
This introduces a template function to swap the bytes of a value,
and macros for the low level swap (taking advantage of gcc and msvc
intrinsics). This produces code like the following (comments are mine):
gcc version 4.2.1 (Based on Apple Inc. build 5658) (LLVM build 2336.11.00)
setValue<double>:
movd %xmm0, %rax ; fp reg -> gen reg
bswapq %rax ; 64-bit byte swap
movd %rax, %xmm0 ; gen reg -> fp reg
movq %xmm0, (%r15,%r12) ; store
When switching into compatibility mode by setting `data` event listener,
`_read()` method will be called immediately. If method implementation
invokes callback in the same tick - all emitted `data` events will be
discarded, because `data` listener wasn't set yet.
