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-rw-r--r--src/common/linux/dump_symbols.cc52
1 files changed, 35 insertions, 17 deletions
diff --git a/src/common/linux/dump_symbols.cc b/src/common/linux/dump_symbols.cc
index e1c3047a..a52c13c8 100644
--- a/src/common/linux/dump_symbols.cc
+++ b/src/common/linux/dump_symbols.cc
@@ -131,6 +131,19 @@ class SourceFileInfoList : public std::list<SourceFileInfo *> {
struct SymbolInfo {
SourceFileInfoList source_file_info;
+ // An array of some addresses at which a file boundary occurs.
+ //
+ // The STABS information describing a compilation unit gives the
+ // unit's start address, but not its ending address or size. Those
+ // must be inferred by finding the start address of the next file.
+ // For the last compilation unit, or when one compilation unit ends
+ // before the next one starts, STABS includes an N_SO entry whose
+ // filename is the empty string; such an entry's address serves
+ // simply to mark the end of the preceding compilation unit. Rather
+ // than create FuncInfoList for such entries, we record their
+ // addresses here. These are not necessarily sorted.
+ std::vector<ElfW(Addr)> file_boundaries;
+
// The next source id for newly found source file.
int next_source_id;
};
@@ -390,11 +403,12 @@ static bool ComputeSizeAndRVA(ElfW(Addr) loading_addr,
FuncInfoList::iterator func_it;
LineInfoList::iterator line_it;
- // A table of all the addresses at which files and functions start.
- // We build this from our lists, sort it, and then use it to find
- // the ends of functions and source lines for which we have no size
+ // A table of all the addresses at which files and functions start
+ // or end. We build this from the file boundary list and our lists
+ // of files and functions, sort it, and then use it to find the ends
+ // of functions and source lines for which we have no size
// information.
- std::vector<ElfW(Addr)> boundaries;
+ std::vector<ElfW(Addr)> boundaries = symbols->file_boundaries;
for (file_it = symbols->source_file_info.begin();
file_it != symbols->source_file_info.end(); file_it++) {
boundaries.push_back((*file_it)->addr);
@@ -497,19 +511,23 @@ static bool LoadSymbols(const ElfW(Shdr) *stab_section,
int step = 1;
struct nlist *cur_list = lists + i;
if (cur_list->n_type == N_SO) {
- // FUNC <address> <length> <param_stack_size> <function>
- struct SourceFileInfo *source_file_info = new SourceFileInfo;
- source_file_info->name_index = cur_list->n_un.n_strx;
- source_file_info->name = reinterpret_cast<char *>(cur_list->n_un.n_strx +
- stabstr_section->sh_offset);
- source_file_info->addr = cur_list->n_value;
- if (strchr(source_file_info->name, '.'))
- source_file_info->source_id = symbols->next_source_id++;
- else
- source_file_info->source_id = -1;
- step = LoadFuncSymbols(cur_list, lists + nstab,
- stabstr_section, source_file_info);
- symbols->source_file_info.push_back(source_file_info);
+ if (cur_list->n_un.n_strx) {
+ struct SourceFileInfo *source_file_info = new SourceFileInfo;
+ source_file_info->name_index = cur_list->n_un.n_strx;
+ source_file_info->name = reinterpret_cast<char *>(cur_list->n_un.n_strx
+ + stabstr_section->sh_offset);
+ source_file_info->addr = cur_list->n_value;
+ if (strchr(source_file_info->name, '.'))
+ source_file_info->source_id = symbols->next_source_id++;
+ else
+ source_file_info->source_id = -1;
+ step = LoadFuncSymbols(cur_list, lists + nstab,
+ stabstr_section, source_file_info);
+ symbols->source_file_info.push_back(source_file_info);
+ } else {
+ // N_SO entries with no name mark file boundary addresses.
+ symbols->file_boundaries.push_back(cur_list->n_value);
+ }
}
i += step;
}