In general, public headers should not have compiler-specific
constructs but both the core and the port headers have attributes,
which are non-standard. It's better to factor out such constructs
to a common place (a new header) and hide them behind macros, which
can then be defined on a per-compiler basis.

This patch moves the existing definitions of function attributes and
likely/unlikely builtins to the new header. At the same time, it
unifies the names of these attribute defines and where they are
used. Moreover, it touches on jerry-main and removes the uses of
`__attribute__((unused))` entirely and replaces them with the
elsewhere used `(void) ...` pattern.

JerryScript-DCO-1.0-Signed-off-by: Akos Kiss akiss@inf.u-szeged.hu

JerryScript-DCO-1.0-Signed-off-by: Zoltan Herczeg zherczeg.u-szeged@partner.samsung.com

This patch removes all ecma_make_simple_value calls to make the code more easy to understand.
Also removes the type ecma_simple_value_t which improves the performance in related code paths by calculating the value of new ecma_value_t is no longer needed.

JerryScript-DCO-1.0-Signed-off-by: Robert Fancsik frobert@inf.u-szeged.hu

Since the project is now hosted at the JS Foundation we can move to unified copyright notices for the project.

Starting with this commit all future contributions to the project should only carry the following copyright notice (except for third-party code which requires copyright information to be preserved):

"Copyright JS Foundation and other contributors, http://js.foundation" (without the quotes)

This avoids cluttering the codebase with contributor-specific copyright notices which have a higher maintenance overhead and tend to get outdated quickly. Also dropping the year from the copyright notices helps to avoid yearly code changes just to update the copyright notices.

Note that each contributor still retains full copyright ownership of his/her contributions and the respective authorship is tracked very accurately via Git.

JerryScript-DCO-1.0-Signed-off-by: Tilmann Scheller t.scheller@samsung.com

JerryScript-DCO-1.0-Signed-off-by: Zoltan Herczeg zherczeg.u-szeged@partner.samsung.com

JerryScript-DCO-1.0-Signed-off-by: Zsolt Borbély zsborbely.u-szeged@partner.samsung.com

JerryScript-DCO-1.0-Signed-off-by: Zoltan Herczeg zherczeg.u-szeged@partner.samsung.com

Remove ecma_completion_value_t, and add an extra bit to
ecma_value_t to represent errors. From the long list of
completion types only normal and error remained.

JerryScript-DCO-1.0-Signed-off-by: László Langó llango.u-szeged@partner.samsung.com
JerryScript-DCO-1.0-Signed-off-by: Zoltan Herczeg zherczeg.u-szeged@partner.samsung.com

JerryScript-DCO-1.0-Signed-off-by: Ruben Ayrapetyan r.ayrapetyan@samsung.com

JerryScript-DCO-1.0-Signed-off-by: Andrey Shitov a.shitov@samsung.com

Supplementing ECMA_TRY_CATCH with assertion that 'return_value' contains empty completion value prior to execution of ECMA_TRY_CATCH statement.

JerryScript-DCO-1.0-Signed-off-by: Ruben Ayrapetyan r.ayrapetyan@samsung.com

The components are build independently and then are linked with main module corresponding to target platform.
Core is supposed to be platform-independent, while libc and plugins are dependent on specific architecture / platform.

The commit disables unit tests building and running during precommit.
That is supposed to be fixed in a subsequent commit.

Also, the commit disables building and running valgrind targets during precommit.
Build is supposed to be turned on by an option that should be introduced later.
Valgrind-checked runs are supposed to be performed in asynchronous mode.

 - components renaming and moving:
   - liballocator -> mem;
   - libcoreint -> vm;
   - libecmaobjects -> ecma/base;
   - libecmaoperations -> ecma/operations;
   - libecmabuiltins -> ecma/builtins;
   - libjsparser -> parser/js;
   - libintstructs -> parser/collections;
   - liboptimizer -> parser/js;
   - libperipherals -> ../plugins/lib_device_stm;
   - libruntime -> jrt;
 - generated.h now is created as intermediate during build;
 - benchmarks -> tests/benchmarks;
 - docs -> documentation;
 - demo-applications removed (loop_demo.js -> tests/blinky.js).

Reverting changes related to on-stack GC-root introduction (except of passing ecma_value_t by const reference).

This reverts commits:
     31e1405f39d72f8b885e92256b0dc29ecab1a99,
     7cb43840b59c539d9b043990ed658ae15a9defc3,
     1ab57a4493689806035a9853b0030cc6fea65590,
     c24b511ca60587e0db12d46a7e7567c86c3649bc,
     b2caf3e8b31b4b6b16499108ee3aabdcb94f0717,
     44f9c307fb6204bfd2181b19a9d94cabddf04de9.

Converting ecma_completion_value_t to class derived from ecma_value_t with additional field with for completion type and related operations.

Completion value are now returned through ecma_completion_value_t &ret_value argument.

Original ecma_value_t is renamed to ecma_value_packed_t and is used for on-heap storage.
Copy and move constructors, move assignment operator of ecma_value_t are not created.
New ecma-value return convention is introduced: ecma-values are now returned through ecma_value_t &ret_val argument.

Returning ecma_value_t instead of ecma_completion_value_t from ECMA_TRY_CATCH for case when completion value is normal.

This reverts commit 6415130925187a877b83b14db40cade0c336ea44.

Removing free of throw completion value in ECMA_TRY_CATCH macro, instead just copying it to the return value variable.

  - the ECMA_OP_TO_NUMBER_TRY_CATCH macro gets number from given value,
    converting the value to number if it's type is different,
    and catching possible conversion exceptions;

  - using the macroses instead of ecma_op_to_number to reduce allocator invocations
    in several routines with arguments that are likely to be numbers.

Refactoring function call operations to return 'normal' completion values instead of 'return' completion values. Removing ECMA_FUNCTION_CALL macro.

Introducing ECMA_FUNCTION_CALL helper macro for handling return completion values of function calls.

Style fixes in libecmaoperations: space between function name and opening parenthesis, no space after opening parenthesis/before closing parenthesis. By mistake, the changes weren't commited with 8081e5cdb38ad0f9789a89c92362fc73a716d85c.