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Improved support for constant functions

This commit is contained in:
Clifford Wolf 2014-02-16 13:16:38 +01:00
parent b0ae19fa92
commit 7ac524e8e8
1 changed files with 50 additions and 1 deletions
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51
frontends/ast/simplify.cc
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@ -1167,9 +1167,11 @@ skip_dynamic_range_lvalue_expansion:;
if (in_param)
{
bool all_args_const = true;
for (auto child : children)
for (auto child : children) {
while (child->simplify(true, false, false, 1, -1, false, true)) { }
if (child->type != AST_CONSTANT)
all_args_const = false;
}
if (all_args_const) {
AstNode *func_workspace = current_scope[str]->clone();
@ -1931,6 +1933,53 @@ AstNode *AstNode::eval_const_function(AstNode *fcall)
continue;
}
if (stmt->type == AST_CASE)
{
AstNode *expr = stmt->children.at(0)->clone();
expr->replace_variables(variables, fcall);
while (expr->simplify(true, false, false, 1, -1, false, true)) { }
AstNode *sel_case = NULL;
for (size_t i = 1; i < stmt->children.size(); i++)
{
bool found_match = false;
log_assert(stmt->children.at(i)->type == AST_COND);
if (stmt->children.at(i)->children.front()->type == AST_DEFAULT) {
sel_case = stmt->children.at(i)->children.back();
continue;
}
for (size_t j = 0; j+1 < stmt->children.at(i)->children.size() && !found_match; j++)
{
AstNode *cond = stmt->children.at(i)->children.at(j)->clone();
cond->replace_variables(variables, fcall);
cond = new AstNode(AST_EQ, expr->clone(), cond);
while (cond->simplify(true, false, false, 1, -1, false, true)) { }
if (cond->type != AST_CONSTANT)
log_error("Non-constant expression in constant function at %s:%d (called from %s:%d).\n",
stmt->filename.c_str(), stmt->linenum, fcall->filename.c_str(), fcall->linenum);
found_match = cond->asBool();
delete cond;
}
if (found_match) {
sel_case = stmt->children.at(i)->children.back();
break;
}
}
block->children.erase(block->children.begin());
if (sel_case)
block->children.insert(block->children.begin(), sel_case->clone());
delete stmt;
delete expr;
continue;
}
if (stmt->type == AST_BLOCK)
{
block->children.erase(block->children.begin());