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Maksim Panchenko 3b3752c898 HHVM calling conventions. 
HHVM calling convention, hhvmcc, is used by HHVM JIT for
functions in translated cache. We currently support LLVM back end to
generate code for X86-64 and may support other architectures in the
future.

In HHVM calling convention any GP register could be used to pass and
return values, with the exception of R12 which is reserved for
thread-local area and is callee-saved. Other than R12, we always
pass RBX and RBP as args, which are our virtual machine's stack pointer
and frame pointer respectively.

When we enter translation cache via hhvmcc function, we expect
the stack to be aligned at 16 bytes, i.e. skewed by 8 bytes as opposed
to standard ABI alignment. This affects stack object alignment and stack
adjustments for function calls.

One extra calling convention, hhvm_ccc, is used to call C++ helpers from
HHVM's translation cache. It is almost identical to standard C calling
convention with an exception of first argument which is passed in RBP
(before we use RDI, RSI, etc.)

Differential Revision: http://reviews.llvm.org/D12681

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@248832 91177308-0d34-0410-b5e6-96231b3b80d8
2015-09-29 22:09:16 +00:00
..
ftdetect Vim: Set filetype=python for lit configuration files. 2015-05-04 21:41:23 +00:00
ftplugin [vim] Add the IR's comment prefix to the comments list. This allows vim 2015-07-15 01:36:50 +00:00
indent Vim: Fix some bugs in llvm indent plugin. 2015-05-04 21:41:25 +00:00
syntax HHVM calling conventions. 2015-09-29 22:09:16 +00:00
README Rename all references to old mailing lists to new lists.llvm.org address. 2015-08-05 03:51:17 +00:00
vimrc Enable syntax highlighting for reStructuredText files. 2013-02-28 06:43:24 +00:00

README 

-*- llvm/utils/vim/README -*-

This directory contains settings for the vim editor to work on llvm *.ll and
tablegen *.td files. It comes with filetype detection rules in the (ftdetect),
syntax highlighting (syntax), some minimal sensible default settings (ftplugin)
and indentation plugins (indent).

To install copy all subdirectories to your $HOME/.vim or if you prefer create
symlinks to the files here. Do not copy the vimrc file here it is only meant as an inspiration and starting point for those working on llvm c++ code.

Note: If you notice missing or incorrect syntax highlighting, please contact
<llvm-bugs [at] lists.llvm.org>; if you wish to provide a patch to improve the
functionality, it will be most appreciated. Thank you.

If you find yourself working with LLVM Makefiles often, but you don't get syntax
highlighting (because the files have names such as Makefile.rules or
TEST.nightly.Makefile), add the following to your ~/.vimrc:

  " LLVM Makefile highlighting mode
  augroup filetype
    au! BufRead,BufNewFile *Makefile*     set filetype=make
  augroup END