Initial pass at Go language support.

	* NEWS: Mention Go.
	* Makefile.in (SFILES): Add go-exp.y, go-lang.c, go-typeprint.c,
	go-valprint.c.
	(COMMON_OBS): Add go-lang.o, go-val.print.o, go-typeprint.o.
	(YYFILES): Add go-exp.c.
	(YYOBJ): Add go-exp.o.
	(local-maintainer-clean): Delete go-exp.c.
	* defs.h (enum language): Add language_go.
	* dwarf2read.c: #include "go-lang.h".
	(fixup_go_packaging): New function.
	(process_full_comp_unit): Call it when processing Go CUs.
	(dwarf2_physname): Add Go support.
	(read_file_scope): Handle missing language spec for GNU Go.
	(set_cu_language): Handle DW_LANG_Go.
	* go-exp.y: New file.
	* go-lang.h: New file.
	* go-lang.c: New file.
	* go-typeprint.c: New file.
	* go-valprint.c: New file.
	* symtab.c: #include "go-lang.h".
	(symbol_set_language): Handle language_go.
	(symbol_find_demangled_name, symbol_set_names): Ditto.
	(symbol_natural_name, demangle_for_lookup, find_main_name): Ditto.

	testsuite/
	* configure.ac: Create gdb.go/Makefile.
	* configure: Regenerate.
	* gdb.base/default.exp: Add "go" to "set language" testing.
	* gdb.go/Makefile.in: New file.
	* gdb.go/basic-types.exp: New file.
	* gdb.go/chan.exp: New file.
	* gdb.go/chan.go: New file.
	* gdb.go/handcall.exp: New file.
	* gdb.go/handcall.go: New file.
	* gdb.go/hello.exp: New file.
	* gdb.go/hello.go: New file.
	* gdb.go/integers.exp: New file.
	* gdb.go/integers.go: New file.
	* gdb.go/methods.exp: New file.
	* gdb.go/methods.go: New file.
	* gdb.go/package.exp: New file.
	* gdb.go/package1.go: New file.
	* gdb.go/package2.go: New file.
	* gdb.go/print.exp: New file.
	* gdb.go/strings.exp: New file.
	* gdb.go/strings.go: New file.
	* gdb.go/types.exp: New file.
	* gdb.go/types.go: New file.
	* gdb.go/unsafe.exp: New file.
	* gdb.go/unsafe.go: New file.
	* lib/future.exp: Add Go support.
	(gdb_find_go, gdb_find_go_linker): New procs.
	(gdb_default_target_compile): Add Go support.
	* lib/gdb.exp (skip_go_tests): New proc.
	* lib/go.exp: New file.

	doc/
	* gdb.texinfo (Supported Languages): Add Go.
	(Go): New node.

2 files changed, 57 insertions, 2 deletions

diff --git a/gdb/doc/ChangeLog b/gdb/doc/ChangeLog
index 92085c9..0f41571 100644
--- a/gdb/doc/ChangeLog
+++ b/gdb/doc/ChangeLog
@@ -1,3 +1,8 @@
+2012-04-25  Doug Evans  <dje@google.com>
+
+	* gdb.texinfo (Supported Languages): Add Go.
+	(Go): New node.
+
 2012-04-25  Yao Qi  <yao@codesourcery.com>
 
 	* gdbint.texinfo (Testsuite): New section `Board settings'.
diff --git a/gdb/doc/gdb.texinfo b/gdb/doc/gdb.texinfo
index a2a4eb3..d4d2f60 100644
--- a/gdb/doc/gdb.texinfo
+++ b/gdb/doc/gdb.texinfo
@@ -12487,8 +12487,8 @@ being set automatically by @value{GDBN}.
 @node Supported Languages
 @section Supported Languages
 
-@value{GDBN} supports C, C@t{++}, D, Objective-C, Fortran, Java, OpenCL C, Pascal,
-assembly, Modula-2, and Ada.
+@value{GDBN} supports C, C@t{++}, D, Go, Objective-C, Fortran, Java,
+OpenCL C, Pascal, assembly, Modula-2, and Ada.
 @c This is false ...
 Some @value{GDBN} features may be used in expressions regardless of the
 language you use: the @value{GDBN} @code{@@} and @code{::} operators,
@@ -12507,6 +12507,7 @@ language reference or tutorial.
 @menu
 * C::                           C and C@t{++}
 * D::                           D
+* Go::                          Go
 * Objective-C::                 Objective-C
 * OpenCL C::                    OpenCL C
 * Fortran::                     Fortran
@@ -13059,6 +13060,55 @@ See @ref{PowerPC,,PowerPC} for more details.
 GDC, LDC or DMD compilers. Currently @value{GDBN} supports only one D
 specific feature --- dynamic arrays.
 
+@node Go
+@subsection Go
+
+@cindex Go (programming language)
+@value{GDBN} can be used to debug programs written in Go and compiled with
+@file{gccgo} or @file{6g} compilers.
+
+Here is a summary of the Go-specific features and restrictions:
+
+@table @code
+@cindex current Go package
+@item The current Go package
+The name of the current package does not need to be specified when
+specifying global variables and functions.
+
+For example, given the program:
+
+@example
+package main
+var myglob = "Shall we?"
+func main () @{
+  // ...
+@}
+@end example
+
+When stopped inside @code{main} either of these work:
+
+@example
+(gdb) p myglob
+(gdb) p main.myglob
+@end example
+
+@cindex builtin Go types
+@item Builtin Go types
+The @code{string} type is recognized by @value{GDBN} and is printed
+as a string.
+
+@cindex builtin Go functions
+@item Builtin Go functions
+The @value{GDBN} expression parser recognizes the @code{unsafe.Sizeof}
+function and handles it internally.
+@end table
+
+@cindex restrictions on Go expressions
+@item Restrictions on Go expressions
+All Go operators are supported except @code{&^}.
+The Go @code{_} ``blank identifier'' is not supported.
+Automatic dereferencing of pointers is not supported.
+
 @node Objective-C
 @subsection Objective-C