gccrs: proc_macro: Add literal_from_string callback

The function to get a literal from a string missed an implementation.
It did require a conversion function to achieve it, now that callback
system has been merged this function can be easily implemented.

gcc/rust/ChangeLog:

	* expand/rust-proc-macro.cc (literal_from_string): Add callback
	function.
	(load_macros_array): Likewise.

libgrust/ChangeLog:

	* libproc_macro/literal.cc (Literal__from_string): Add
	implementation with call to constructor.
	(Literal::make_literal): Add new constructor which calls the
	callback.
	* libproc_macro/literal.h: Add new constructor's
	prototype.
	* libproc_macro/proc_macro.cc (bridge_is_available):
	Change symbol name to match convention.
	* libproc_macro/registration.h: Add lit_from_str
	symbol.
	* libproc_macro/tokenstream.cc (TokenStream::make_tokenstream):
	Change symbol name to disambiguate with literal from string.

Signed-off-by: Pierre-Emmanuel Patry <pierre-emmanuel.patry@embecosm.com>

5 files changed, 25 insertions, 11 deletions

diff --git a/libgrust/libproc_macro/literal.cc b/libgrust/libproc_macro/literal.cc
index 8e1e0a4a116..ea09106cd62 100644
--- a/libgrust/libproc_macro/literal.cc
+++ b/libgrust/libproc_macro/literal.cc
@@ -24,15 +24,19 @@
 #include <cstring>
 #include <cstdlib>
 
+#include "registration.h"
+
 namespace ProcMacro {
 
 extern "C" {
 bool
 Literal__from_string (FFIString str, Literal *lit)
 {
-  // FIXME: implement this function with lexer
-  std::abort ();
-  return false;
+  bool result;
+  auto source = str.to_string ();
+
+  *lit = Literal::make_literal (source, result);
+  return result;
 }
 }
 
@@ -50,6 +54,12 @@ Literal::clone () const
 }
 
 Literal
+Literal::make_literal (const std::string &text, bool &has_error)
+{
+  return __gccrs_proc_macro_lit_from_str_ (text, has_error);
+}
+
+Literal
 Literal::make_literal (LitKind kind, Span span, const std::string &text,
 		       const std::string &suffix)
 {
diff --git a/libgrust/libproc_macro/literal.h b/libgrust/libproc_macro/literal.h
index fb8a8b442e2..37ba0891dbe 100644
--- a/libgrust/libproc_macro/literal.h
+++ b/libgrust/libproc_macro/literal.h
@@ -77,6 +77,7 @@ public:
   Literal clone () const;
   bool has_suffix () const { return suffix.len != 0; };
 
+  static Literal make_literal (const std::string &text, bool &has_error);
   static Literal make_literal (const LitKind kind, Span span,
 			       const std::string &text,
 			       const std::string &suffix = "");
diff --git a/libgrust/libproc_macro/proc_macro.cc b/libgrust/libproc_macro/proc_macro.cc
index 293fc957038..0490673b656 100644
--- a/libgrust/libproc_macro/proc_macro.cc
+++ b/libgrust/libproc_macro/proc_macro.cc
@@ -53,12 +53,12 @@ Procmacro::make_bang (const char *name, BangMacro macro)
 extern "C" bool
 bridge_is_available ()
 {
-  return __gccrs_proc_macro_is_available_fn
-	 == ProcMacro::BridgeState::Available;
+  return __gccrs_proc_macro_is_available_ == ProcMacro::BridgeState::Available;
 }
 
 } // namespace ProcMacro
 
-ProcMacro::from_str_function_t __gccrs_proc_macro_from_str_fn = nullptr;
-ProcMacro::BridgeState __gccrs_proc_macro_is_available_fn
+ProcMacro::ts_from_str_fn_t __gccrs_proc_macro_ts_from_str_ = nullptr;
+ProcMacro::lit_from_str_fn_t __gccrs_proc_macro_lit_from_str_ = nullptr;
+ProcMacro::BridgeState __gccrs_proc_macro_is_available_
   = ProcMacro::BridgeState::Unavailable;
diff --git a/libgrust/libproc_macro/registration.h b/libgrust/libproc_macro/registration.h
index aba7edd81fb..98e7c139c27 100644
--- a/libgrust/libproc_macro/registration.h
+++ b/libgrust/libproc_macro/registration.h
@@ -26,14 +26,17 @@
 #include <string>
 #include "tokenstream.h"
 #include "bridge.h"
+#include "literal.h"
 
 namespace ProcMacro {
 
-using from_str_function_t = ProcMacro::TokenStream (*) (std::string &, bool &);
+using ts_from_str_fn_t = ProcMacro::TokenStream (*) (std::string &, bool &);
+using lit_from_str_fn_t = ProcMacro::Literal (*) (const std::string &, bool &);
 
 } // namespace ProcMacro
 
-extern "C" ProcMacro::from_str_function_t __gccrs_proc_macro_from_str_fn;
-extern "C" ProcMacro::BridgeState __gccrs_proc_macro_is_available_fn;
+extern "C" ProcMacro::ts_from_str_fn_t __gccrs_proc_macro_ts_from_str_;
+extern "C" ProcMacro::lit_from_str_fn_t __gccrs_proc_macro_lit_from_str_;
+extern "C" ProcMacro::BridgeState __gccrs_proc_macro_is_available_;
 
 #endif /* !REGISTRATION_H */
diff --git a/libgrust/libproc_macro/tokenstream.cc b/libgrust/libproc_macro/tokenstream.cc
index 0f7f1f2079b..685f28424d2 100644
--- a/libgrust/libproc_macro/tokenstream.cc
+++ b/libgrust/libproc_macro/tokenstream.cc
@@ -49,7 +49,7 @@ TokenStream::make_tokenstream (std::uint64_t capacity)
 TokenStream
 TokenStream::make_tokenstream (std::string &source, bool &has_error)
 {
-  return __gccrs_proc_macro_from_str_fn (source, has_error);
+  return __gccrs_proc_macro_ts_from_str_ (source, has_error);
 }
 
 void