Merge pull request #45 from orsonmmz/subprogram

Subprograms

vhdlpp/architec_emit.cc

@@ -21,6 +21,7 @@
 # include  "entity.h"
 # include  "expression.h"
 # include  "sequential.h"
+# include  "subprogram.h"
 # include  "vsignal.h"
 # include  <iostream>
 # include  <typeinfo>

vhdlpp/compiler.h

@@ -34,8 +34,4 @@ extern StringHeapLex lex_strings;
 
 extern StringHeapLex filename_strings;
 
-extern void library_set_work_path(const char*work_path);
-extern void library_add_directory(const char*directory);
-extern int emit_packages(void);
-
 #endif /* IVL_compiler_H */

vhdlpp/debug.cc

@@ -23,6 +23,7 @@
 # include  "architec.h"
 # include  "expression.h"
 # include  "parse_types.h"
+# include  "subprogram.h"
 # include  "sequential.h"
 # include  "vsignal.h"
 # include  "vtype.h"

vhdlpp/expression_elaborate.cc

@@ -23,6 +23,8 @@
 # include  "architec.h"
 # include  "entity.h"
 # include  "vsignal.h"
+# include  "subprogram.h"
+# include  "library.h"
 # include  <iostream>
 # include  <typeinfo>
 # include  "parse_types.h"
@@ -710,11 +712,16 @@ int ExpFunc::elaborate_expr(Entity*ent, Architecture*arc, const VType*)
       ivl_assert(*this, arc);
       Subprogram*prog = arc->find_subprogram(name_);
 
+      if(!prog)
+            prog = library_find_subprogram(name_);
+
       ivl_assert(*this, def_==0);
       def_ = prog;
 
       for (size_t idx = 0 ; idx < argv_.size() ; idx += 1) {
 	    const VType*tmp = argv_[idx]->probe_type(ent, arc);
+	    if(!tmp && prog)
+	        tmp = prog->peek_param_type(idx);
 	    errors += argv_[idx]->elaborate_expr(ent, arc, tmp);
       }
 

vhdlpp/expression_emit.cc

@@ -22,6 +22,7 @@
 # include  "vtype.h"
 # include  "architec.h"
 # include  "package.h"
+# include  "subprogram.h"
 # include  "parse_types.h"
 # include  <typeinfo>
 # include  <iostream>

vhdlpp/library.cc

@@ -69,7 +69,25 @@ void library_add_directory(const char*directory)
 	    return;
       }
 
-      library_search_path .push_front(directory);
+      library_search_path.push_front(directory);
+}
+
+Subprogram*library_find_subprogram(perm_string name)
+{
+      Subprogram*subp = NULL;
+      map<perm_string,struct library_contents>::const_iterator lib_it;
+
+      for(lib_it = libraries.begin(); lib_it != libraries.end(); ++lib_it) {
+        const struct library_contents&lib = lib_it->second;
+        map<perm_string,Package*>::const_iterator pack_it;
+
+        for(pack_it = lib.packages.begin(); pack_it != lib.packages.end(); ++pack_it) {
+            if((subp = pack_it->second->find_subprogram(name)))
+                return subp;
+        }
+      }
+
+      return NULL;
 }
 
 static void store_package_in_work(const Package*pack);

vhdlpp/library.h

@@ -0,0 +1,32 @@
+#ifndef IVL_library_H
+#define IVL_library_H
+/*
+ * Copyright (c) 2011-2014 Stephen Williams (steve@icarus.com)
+ *
+ *    This source code is free software; you can redistribute it
+ *    and/or modify it in source code form under the terms of the GNU
+ *    General Public License as published by the Free Software
+ *    Foundation; either version 2 of the License, or (at your option)
+ *    any later version.
+ *
+ *    This program is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    GNU General Public License for more details.
+ *
+ *    You should have received a copy of the GNU General Public License
+ *    along with this program; if not, write to the Free Software
+ *    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+
+class Subprogram;
+
+extern void library_set_work_path(const char*work_path);
+extern void library_add_directory(const char*directory);
+
+extern Subprogram*library_find_subprogram(perm_string name);
+
+extern int emit_packages(void);
+
+#endif /* IVL_library_H */
+

vhdlpp/main.cc

@@ -75,6 +75,7 @@ const char NOTICE[] =
 ;
 
 # include  "compiler.h"
+# include  "library.h"
 # include  "parse_api.h"
 # include  "vtype.h"
 # include  <fstream>

vhdlpp/package.cc

@@ -20,6 +20,7 @@
 
 # include  "package.h"
 # include  "entity.h"
+# include  "subprogram.h"
 # include  "parse_misc.h"
 # include  "ivl_assert.h"
 

vhdlpp/package_emit.cc

@@ -19,6 +19,7 @@
  */
 
 # include  "package.h"
+# include  "subprogram.h"
 # include  <iostream>
 # include  "ivl_assert.h"
 

vhdlpp/parse.y

@@ -83,6 +83,7 @@ extern int yylex(union YYSTYPE*yylvalp,YYLTYPE*yyllocp,yyscan_t yyscanner);
  */
 static ActiveScope*active_scope = new ActiveScope;
 static stack<ActiveScope*> scope_stack;
+static Subprogram*active_sub = NULL;
 
 /*
  * When a scope boundary starts, call the push_scope function to push
@@ -106,6 +107,13 @@ static void pop_scope(void)
       scope_stack.pop();
 }
 
+static bool is_subprogram_param(perm_string name)
+{
+    if(!active_sub)
+        return false;
+
+    return (active_sub->find_param(name) != NULL);
+}
 
 void preload_global_types(void)
 {
@@ -1543,7 +1551,7 @@ name /* IEEE 1076-2008 P8.1 */
   | IDENTIFIER '(' expression_list ')'
       { perm_string name = lex_strings.make($1);
 	delete[]$1;
-	if (active_scope->is_vector_name(name)) {
+	if (active_scope->is_vector_name(name) || is_subprogram_param(name)) {
 	      ExpName*tmp = new ExpName(name, $3);
 	      $$ = tmp;
 	} else {
@@ -1813,16 +1821,7 @@ procedure_call_statement
   ;
 
 process_declarative_item
-  : K_variable identifier_list ':' subtype_indication ';'
-      { /* Save the signal declaration in the block_signals map. */
-	for (std::list<perm_string>::iterator cur = $2->begin()
-		   ; cur != $2->end() ; ++cur) {
-	      Variable*sig = new Variable(*cur, $4);
-	      FILE_NAME(sig, @1);
-	      active_scope->bind_name(*cur, sig);
-	}
-	delete $2;
-      }
+  : variable_declaration
   ;
 
 process_declarative_part
@@ -2175,6 +2174,7 @@ signal_assignment_statement
 
 subprogram_body /* IEEE 1076-2008 P4.3 */
   : subprogram_specification K_is
+      { active_sub = $1; }
     subprogram_declarative_part
     K_begin subprogram_statement_part K_end
     subprogram_kind_opt identifier_opt ';'
@@ -2186,8 +2186,10 @@ subprogram_body /* IEEE 1076-2008 P4.3 */
 	} else if (tmp) {
 	      errormsg(@1, "Subprogram specification for %s doesn't match specification in package header.\n", prog->name().str());
 	}
-	prog->set_program_body($5);
+	prog->transfer_from(*active_scope);
+	prog->set_program_body($6);
 	active_scope->bind_name(prog->name(), prog);
+	active_sub = NULL;
       }
 
   | subprogram_specification K_is
@@ -2410,8 +2412,15 @@ variable_assignment_statement /* IEEE 1076-2008 P10.6.1 */
 
 variable_declaration /* IEEE 1076-2008 P6.4.2.4 */
   : K_shared_opt K_variable identifier_list ':' subtype_indication ';'
-      { sorrymsg(@2, "variable_declaration not supported.\n"); }
-
+      { /* Save the signal declaration in the block_signals map. */
+	for (std::list<perm_string>::iterator cur = $3->begin()
+		   ; cur != $3->end() ; ++cur) {
+	      Variable*sig = new Variable(*cur, $5);
+	      FILE_NAME(sig, @2);
+	      active_scope->bind_name(*cur, sig);
+	}
+	delete $3;
+      }
   | K_shared_opt K_variable error ';'
       { errormsg(@2, "Syntax error in variable declaration.\n");
 	yyerrok;

vhdlpp/scope.cc

@@ -20,6 +20,7 @@
 
 # include  "scope.h"
 # include  "package.h"
+# include  "subprogram.h"
 # include  <algorithm>
 # include  <iostream>
 # include  <iterator>
@@ -202,6 +203,27 @@ void ScopeBase::do_use_from(const ScopeBase*that)
       }
 }
 
+void ScopeBase::transfer_from(ScopeBase&ref)
+{
+    std::copy(ref.new_signals_.begin(), ref.new_signals_.end(),
+          insert_iterator<map<perm_string, Signal*> >(
+              new_signals_, new_signals_.end())
+    );
+    ref.new_signals_.clear();
+
+    std::copy(ref.new_variables_.begin(), ref.new_variables_.end(),
+          insert_iterator<map<perm_string, Variable*> >(
+              new_variables_, new_variables_.end())
+    );
+    ref.new_variables_.clear();
+
+    std::copy(ref.new_components_.begin(), ref.new_components_.end(),
+          insert_iterator<map<perm_string, ComponentBase*> >(
+              new_components_, new_components_.end())
+    );
+    ref.new_components_.clear();
+}
+
 void ActiveScope::set_package_header(Package*pkg)
 {
       assert(package_header_ == 0);

vhdlpp/scope.h

@@ -26,7 +26,6 @@
 # include  "StringHeap.h"
 # include  "entity.h"
 # include  "expression.h"
-# include  "subprogram.h"
 # include  "vsignal.h"
 
 class ActiveScope;
@@ -58,6 +57,9 @@ class ScopeBase {
       Signal* find_signal(perm_string by_name) const;
       Variable* find_variable(perm_string by_name) const;
       Subprogram* find_subprogram(perm_string by_name) const;
+	// Moves all signals, variables and components from another scope to
+	// this one. After the transfer new_* maps are emptied in the another scope.
+      void transfer_from(ScopeBase&ref);
 
     protected:
       void cleanup();
@@ -203,7 +205,7 @@ class ActiveScope : public ScopeBase {
       { map<perm_string, Subprogram*>::iterator it;
         if((it = use_subprograms_.find(name)) != use_subprograms_.end() )
             use_subprograms_.erase(it);
-        cur_subprograms_[name] = obj;;
+        cur_subprograms_[name] = obj;
       }
 
       void bind(Entity*ent)

vhdlpp/sequential.h

@@ -120,6 +120,8 @@ class ReturnStmt  : public SequentialStmt {
       int emit(ostream&out, Entity*entity, Architecture*arc);
       void dump(ostream&out, int indent) const;
 
+      const Expression*peek_expr() const { return val_; };
+
     private:
       Expression*val_;
 };

vhdlpp/subprogram.cc

@@ -21,6 +21,7 @@
 # include  "subprogram.h"
 # include  "entity.h"
 # include  "vtype.h"
+# include  "sequential.h"
 # include  "ivl_assert.h"
 
 using namespace std;
@@ -45,6 +46,7 @@ void Subprogram::set_program_body(list<SequentialStmt*>*stmt)
 {
       ivl_assert(*this, statements_==0);
       statements_ = stmt;
+      fix_return_type();
 }
 
 bool Subprogram::compare_specification(Subprogram*that) const
@@ -78,6 +80,57 @@ bool Subprogram::compare_specification(Subprogram*that) const
       return true;
 }
 
+const InterfacePort*Subprogram::find_param(perm_string nam) const
+{
+      if(!ports_)
+        return NULL;
+
+      for (std::list<InterfacePort*>::const_iterator it = ports_->begin()
+                ; it != ports_->end(); ++it) {
+        if((*it)->name == nam)
+            return *it;
+      }
+
+      return NULL;
+}
+
+const VType*Subprogram::peek_param_type(int idx) const
+{
+      if(!ports_ || idx >= ports_->size())
+        return NULL;
+
+      std::list<InterfacePort*>::const_iterator p = ports_->begin();
+      std::advance(p, idx);
+
+      return (*p)->type;
+}
+
+void Subprogram::fix_return_type(void)
+{
+    if(!statements_)
+        return;
+
+    const ReturnStmt*ret = NULL;
+    const VType*t = NULL;
+
+    for (std::list<SequentialStmt*>::const_iterator s = statements_->begin()
+	; s != statements_->end(); ++s) {
+      if((ret = dynamic_cast<const ReturnStmt*>(*s))) {
+            const Expression*expr = ret->peek_expr();
+
+            if(const ExpName*n = dynamic_cast<const ExpName*>(expr)) {
+                if(Variable*v = find_variable(n->peek_name()))
+                    t = v->peek_type();
+            } else {
+                t = expr->peek_type();
+            }
+
+            if(t)
+                return_type_ = t;
+        }
+    }
+}
+
 void Subprogram::write_to_stream(ostream&fd) const
 {
       fd << "  function " << name_ << "(";

vhdlpp/subprogram.h

@@ -22,15 +22,15 @@
 
 # include  "StringHeap.h"
 # include  "LineInfo.h"
+# include  "scope.h"
 # include  <iostream>
 # include  <list>
 
 class InterfacePort;
-class ScopeBase;
 class SequentialStmt;
 class VType;
 
-class Subprogram : public LineInfo {
+class Subprogram : public LineInfo, public ScopeBase {
 
     public:
       Subprogram(perm_string name, std::list<InterfacePort*>*ports,
@@ -48,6 +48,11 @@ class Subprogram : public LineInfo {
 	// matches this subprogram and that subprogram.
       bool compare_specification(Subprogram*that) const;
 
+      const InterfacePort*find_param(perm_string nam) const;
+      const VType*peek_param_type(int idx) const;
+
+      int emit(ostream&out, Entity*ent, Architecture*arc);
+
 	// Emit a definition as it would show up in a package.
       int emit_package(std::ostream&fd) const;
 
@@ -55,6 +60,10 @@ class Subprogram : public LineInfo {
       void dump(std::ostream&fd) const;
 
     private:
+	// Determines appropriate return type. Un case of std_logic_vector
+	// VHDL requires skipping its size in contrary to Verilog
+      void fix_return_type(void);
+
       perm_string name_;
       const ScopeBase*parent_;
       std::list<InterfacePort*>*ports_;

vhdlpp/subprogram_emit.cc

@@ -60,6 +60,13 @@ int Subprogram::emit_package(ostream&fd) const
 
       fd << ");" << endl;
 
+      for (map<perm_string,Variable*>::const_iterator cur = new_variables_.begin()
+         ; cur != new_variables_.end() ; ++cur) {
+        // Workaround to enable reg_flag for variables
+        cur->second->count_ref_sequ();
+        errors += cur->second->emit(fd, NULL, NULL);
+      }
+
       if (statements_) {
 	    for (list<SequentialStmt*>::const_iterator cur = statements_->begin()
 		       ; cur != statements_->end() ; ++cur) {

vhdlpp/vtype.h

@@ -86,7 +86,7 @@ class VType {
       virtual bool can_be_packed() const { return false; }
 
     private:
-      friend class decl_t;
+      friend struct decl_t;
 	// This virtual method is called to emit the declaration. This
 	// is used by the decl_t object to emit variable/wire/port declarations.
       virtual int emit_decl(std::ostream&out, perm_string name, bool reg_flag) const;