diff options
Diffstat (limited to 'gold/icf.h')
| -rw-r--r-- | gold/icf.h | 38 |
1 files changed, 37 insertions, 1 deletions
@@ -50,9 +50,11 @@ class Icf typedef Unordered_map<Section_id, unsigned int, Section_id_hash> Uniq_secn_id_map; + typedef Unordered_set<Section_id, Section_id_hash> Secn_fptr_taken_set; Icf() : id_section_(), section_id_(), kept_section_id_(), + fptr_section_id_(), num_tracked_relocs(NULL), icf_ready_(false), section_reloc_list_(), symbol_reloc_list_(), addend_reloc_list_() @@ -88,7 +90,37 @@ class Icf // given section. bool is_section_folded(Object* obj, unsigned int shndx); - + + // Given an object and a section index, this returns true if the + // pointer of the function defined in this section is taken. + bool + section_has_function_pointers(Object *obj, unsigned int shndx) + { + return (this->fptr_section_id_.find(Section_id(obj, shndx)) + != this->fptr_section_id_.end()); + } + + // Records that a pointer of the function defined in this section + // is taken. + void + set_section_has_function_pointers(Object *obj, unsigned int shndx) + { + this->fptr_section_id_.insert(Section_id(obj, shndx)); + } + + // Checks if the section_name should be searched for relocs + // corresponding to taken function pointers. Ignores eh_frame + // and vtable sections. + inline bool + check_section_for_function_pointers(std::string section_name, + Target* target) + { + return (parameters->options().icf_safe_folding() + && target->can_check_for_function_pointers() + && !is_prefix_of(".rodata._ZTV", section_name.c_str()) + && !is_prefix_of(".eh_frame", section_name.c_str())); + } + // Returns a map of a section to a list of all sections referenced // by its relocations. Section_list& @@ -122,6 +154,10 @@ class Icf // section. If the id's are the same then this section is // not folded. std::vector<unsigned int> kept_section_id_; + // Given a section id, this says if the pointer to this + // function is taken in which case it is dangerous to fold + // this function. + Secn_fptr_taken_set fptr_section_id_; unsigned int* num_tracked_relocs; // Flag to indicate if ICF has been run. bool icf_ready_; |