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Added Verilog/AST support for DPI functions (dpi_call() still unimplemented)

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This commit is contained in:
Clifford Wolf 2014-08-21 12:43:51 +02:00
parent 38addd4c67
commit 7bfc4ae120
8 changed files with 135 additions and 3 deletions
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1
frontends/ast/Makefile.inc
View file

@ -2,4 +2,5 @@
OBJS += frontends/ast/ast.o
OBJS += frontends/ast/simplify.o
OBJS += frontends/ast/genrtlil.o
OBJS += frontends/ast/dpicall.o

1
frontends/ast/ast.cc
View file

@ -68,6 +68,7 @@ std::string AST::type2str(AstNodeType type)
X(AST_MODULE)
X(AST_TASK)
X(AST_FUNCTION)
X(AST_DPI_FUNCTION)
X(AST_WIRE)
X(AST_MEMORY)
X(AST_AUTOWIRE)

4
frontends/ast/ast.h
View file

@ -46,6 +46,7 @@ namespace AST
AST_MODULE,
AST_TASK,
AST_FUNCTION,
AST_DPI_FUNCTION,
AST_WIRE,
AST_MEMORY,
@ -278,6 +279,9 @@ namespace AST
// set set_line_num and get_line_num to internal dummy functions (done by simplify() and AstModule::derive
// to control the filename and linenum properties of new nodes not generated by a frontend parser)
void use_internal_line_num();
// call a DPI function
AstNode *dpi_call(const std::string &rtype, const std::string &fname, const std::vector<std::string> &argtypes, const std::vector<AstNode*> &args);
}
namespace AST_INTERNAL

44
frontends/ast/dpicall.cc Normal file
View file

@ -0,0 +1,44 @@
/*
* yosys -- Yosys Open SYnthesis Suite
*
* Copyright (C) 2012 Clifford Wolf <clifford@clifford.at>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
*/
#include "ast.h"
AST::AstNode *AST::dpi_call(const std::string &rtype, const std::string &fname, const std::vector<std::string> &argtypes, const std::vector<AstNode*> &args)
{
AST::AstNode *newNode = nullptr;
log("Calling DPI function `%s' and returning `%s':\n", fname.c_str(), rtype.c_str());
log_assert(SIZE(args) == SIZE(argtypes));
for (int i = 0; i < SIZE(args); i++)
if (argtypes[i] == "real" || argtypes[i] == "shortreal")
log(" arg %d (%s): %f\n", i, argtypes[i].c_str(), args[i]->asReal(args[i]->is_signed));
else
log(" arg %d (%s): %d\n", i, argtypes[i].c_str(), args[i]->bitsAsConst().as_int());
if (rtype == "real" || rtype == "shortreal") {
newNode = new AstNode(AST_REALVALUE);
newNode->realvalue = 1234;
} else {
newNode = AstNode::mkconst_int(1234, false);
}
return newNode;
}

1
frontends/ast/genrtlil.cc
View file

@ -753,6 +753,7 @@ RTLIL::SigSpec AstNode::genRTLIL(int width_hint, bool sign_hint)
// and are only accessed here thru this references
case AST_TASK:
case AST_FUNCTION:
case AST_DPI_FUNCTION:
case AST_AUTOWIRE:
case AST_LOCALPARAM:
case AST_DEFPARAM:

32
frontends/ast/simplify.cc
View file

@ -226,7 +226,7 @@ bool AstNode::simplify(bool const_fold, bool at_zero, bool in_lvalue, int stage,
this_wire_scope[node->str] = node;
}
if (node->type == AST_PARAMETER || node->type == AST_LOCALPARAM || node->type == AST_WIRE || node->type == AST_AUTOWIRE || node->type == AST_GENVAR ||
node->type == AST_MEMORY || node->type == AST_FUNCTION || node->type == AST_TASK || node->type == AST_CELL) {
node->type == AST_MEMORY || node->type == AST_FUNCTION || node->type == AST_TASK || node->type == AST_DPI_FUNCTION || node->type == AST_CELL) {
backup_scope[node->str] = current_scope[node->str];
current_scope[node->str] = node;
}
@ -646,7 +646,7 @@ bool AstNode::simplify(bool const_fold, bool at_zero, bool in_lvalue, int stage,
if (current_scope.count(str) == 0) {
for (auto node : current_ast_mod->children) {
if ((node->type == AST_PARAMETER || node->type == AST_LOCALPARAM || node->type == AST_WIRE || node->type == AST_AUTOWIRE || node->type == AST_GENVAR ||
node->type == AST_MEMORY || node->type == AST_FUNCTION || node->type == AST_TASK) && str == node->str) {
node->type == AST_MEMORY || node->type == AST_FUNCTION || node->type == AST_TASK || node->type == AST_DPI_FUNCTION) && str == node->str) {
current_scope[node->str] = node;
break;
}
@ -1442,6 +1442,34 @@ skip_dynamic_range_lvalue_expansion:;
goto apply_newNode;
}
if (current_scope.count(str) != 0 && current_scope[str]->type == AST_DPI_FUNCTION)
{
AstNode *dpi_decl = current_scope[str];
std::string rtype, fname;
std::vector<std::string> argtypes;
std::vector<AstNode*> args;
rtype = RTLIL::unescape_id(dpi_decl->children.at(0)->str);
fname = RTLIL::unescape_id(dpi_decl->str);
for (int i = 1; i < SIZE(dpi_decl->children); i++)
{
if (i-1 >= SIZE(children))
log_error("Insufficient number of arguments in DPI function call at %s:%d.\n", filename.c_str(), linenum);
argtypes.push_back(RTLIL::unescape_id(dpi_decl->children.at(i)->str));
args.push_back(children.at(i-1)->clone());
while (args.back()->simplify(true, false, false, stage, -1, false, true)) { }
if (args.back()->type != AST_CONSTANT && args.back()->type != AST_REALVALUE)
log_error("Failed to evaluate DPI function with non-constant argument at %s:%d.\n", filename.c_str(), linenum);
}
newNode = dpi_call(rtype, fname, argtypes, args);
goto apply_newNode;
}
if (current_scope.count(str) == 0 || current_scope[str]->type != AST_FUNCTION)
log_error("Can't resolve function name `%s' at %s:%d.\n", str.c_str(), filename.c_str(), linenum);
}