| 1 | //
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| 2 | // Cforall Version 1.0.0 Copyright (C) 2021 University of Waterloo
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| 3 | //
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| 4 | // The contents of this file are covered under the licence agreement in the
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| 5 | // file "LICENCE" distributed with Cforall.
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| 6 | //
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| 7 | // LinkOnce.cc -- Translate the cfa_linkonce attribute.
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| 8 | //
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| 9 | // Author : Andrew Beach
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| 10 | // Created On : Thur May 13 10:10:00 2021
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| 11 | // Last Modified By : Andrew Beach
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| 12 | // Last Modified On : Thur May 13 14:39:00 2021
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| 13 | // Update Count : 0
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| 14 | //
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| 15 |
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| 16 | #include "LinkOnce.h"
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| 17 |
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| 18 | #include <algorithm>
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| 19 |
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| 20 | #include "Common/PassVisitor.h" // for PassVisitor, WithShortCircuiting
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| 21 |
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| 22 | namespace CodeGen {
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| 23 |
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| 24 | static bool is_cfa_linkonce( Attribute const * attr ) {
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| 25 | return std::string("cfa_linkonce") == attr->name;
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| 26 | }
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| 27 |
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| 28 | static bool is_section_attribute( Attribute const * attr ) {
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| 29 | return std::string("section") == attr->name;
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| 30 | }
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| 31 |
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| 32 | class LinkOnceVisitorCore : public WithShortCircuiting {
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| 33 | public:
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| 34 | void previsit( Declaration * ) {
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| 35 | visit_children = false;
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| 36 | }
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| 37 |
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| 38 | void previsit( DeclarationWithType * decl ) {
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| 39 | std::list< Attribute * > & attributes = decl->attributes;
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| 40 | // See if we can find the element:
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| 41 | auto found = std::find_if(attributes.begin(), attributes.end(), is_cfa_linkonce );
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| 42 | if ( attributes.end() != found ) {
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| 43 | // Remove any other sections:
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| 44 | attributes.remove_if( is_section_attribute );
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| 45 | // Iterator to the cfa_linkonce attribute should still be valid.
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| 46 | Attribute * attribute = *found;
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| 47 | assert( attribute->parameters.empty() );
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| 48 | assert( !decl->mangleName.empty() );
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| 49 | // Overwrite the attribute in place.
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| 50 | const std::string section_name = ".gnu.linkonce." + decl->mangleName;
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| 51 | attribute->name = "section";
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| 52 | attribute->parameters.push_back(
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| 53 | new ConstantExpr( Constant::from_string( section_name ) )
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| 54 | );
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| 55 |
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| 56 | // Unconditionnaly add "visibility(default)" to anything with gnu.linkonce
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| 57 | // visibility is a mess otherwise
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| 58 | attributes.push_back(new Attribute("visibility", {new ConstantExpr( Constant::from_string( "default" ) )}));
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| 59 |
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| 60 | }
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| 61 | visit_children = false;
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| 62 | }
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| 63 | };
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| 64 |
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| 65 | void translateLinkOnce( std::list< Declaration *> & translationUnit ) {
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| 66 | PassVisitor<LinkOnceVisitorCore> translator;
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| 67 | acceptAll( translationUnit, translator );
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| 68 | }
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| 69 |
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| 70 | }
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