r200182 - in /branches/gcc-4_8-branch: gcc/go/C...

[ian@gcc.gnu.org]

Author: ian
Date: Tue Jun 18 23:50:42 2013
New Revision: 200182

URL: http://gcc.gnu.org/viewcvs?rev=200182&root=gcc&view=rev
Log:
compiler, runtime: Use function descriptors.

This changes the representation of a Go value of function type
from being a pointer to function code (like a C function
pointer) to being a pointer to a struct.  The first field of
the struct points to the function code.  The remaining fields,
if any, are the addresses of variables referenced in enclosing
functions.  For each call to a function, the address of the
function descriptor is passed as the last argument.

This lets us avoid generating trampolines, and removes the use
of writable/executable sections of the heap.

	* go-gcc.cc (Gcc_backend::immutable_struct): Add is_hidden
	parameter.
	(Gcc_backend::immutable_struct_set_init): Likewise.

Modified:
    branches/gcc-4_8-branch/gcc/go/ChangeLog
    branches/gcc-4_8-branch/gcc/go/go-gcc.cc
    branches/gcc-4_8-branch/gcc/go/gofrontend/backend.h
    branches/gcc-4_8-branch/gcc/go/gofrontend/expressions.cc
    branches/gcc-4_8-branch/gcc/go/gofrontend/expressions.h
    branches/gcc-4_8-branch/gcc/go/gofrontend/gogo-tree.cc
    branches/gcc-4_8-branch/gcc/go/gofrontend/gogo.cc
    branches/gcc-4_8-branch/gcc/go/gofrontend/gogo.h
    branches/gcc-4_8-branch/gcc/go/gofrontend/parse.cc
    branches/gcc-4_8-branch/gcc/go/gofrontend/runtime.def
    branches/gcc-4_8-branch/gcc/go/gofrontend/statements.cc
    branches/gcc-4_8-branch/gcc/go/gofrontend/types.cc
    branches/gcc-4_8-branch/gcc/go/gofrontend/types.h
    branches/gcc-4_8-branch/libgo/Makefile.am
    branches/gcc-4_8-branch/libgo/Makefile.in
    branches/gcc-4_8-branch/libgo/configure
    branches/gcc-4_8-branch/libgo/configure.ac
    branches/gcc-4_8-branch/libgo/go/reflect/all_test.go
    branches/gcc-4_8-branch/libgo/go/reflect/type.go
    branches/gcc-4_8-branch/libgo/go/reflect/value.go
    branches/gcc-4_8-branch/libgo/go/runtime/extern.go
    branches/gcc-4_8-branch/libgo/go/runtime/parfor_test.go
    branches/gcc-4_8-branch/libgo/runtime/go-reflect-call.c
    branches/gcc-4_8-branch/libgo/runtime/malloc.h
    branches/gcc-4_8-branch/libgo/runtime/mfinal.c
    branches/gcc-4_8-branch/libgo/runtime/mgc0.c
    branches/gcc-4_8-branch/libgo/runtime/parfor.c
    branches/gcc-4_8-branch/libgo/runtime/runtime.h
    branches/gcc-4_8-branch/libgo/runtime/time.goc