This patch extends the libLLVMDebugInfo which contains a minimalistic DWARF parser:
1) DIContext is now able to return function name for a given instruction address (besides file/line info).
2) llvm-dwarfdump accepts flag --functions that prints the function name (if address is specified by --address flag).
3) test case that checks the basic functionality of llvm-dwarfdump added
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@159512 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/DebugInfo/DWARFCompileUnit.cpp b/lib/DebugInfo/DWARFCompileUnit.cpp
index 24bf97f..2683990 100644
--- a/lib/DebugInfo/DWARFCompileUnit.cpp
+++ b/lib/DebugInfo/DWARFCompileUnit.cpp
@@ -82,7 +82,7 @@
Abbrevs = 0;
AddrSize = 0;
BaseAddr = 0;
- DieArray.clear();
+ clearDIEs(false);
}
void DWARFCompileUnit::dump(raw_ostream &OS) {
@@ -201,7 +201,7 @@
}
void DWARFCompileUnit::clearDIEs(bool keep_compile_unit_die) {
- if (DieArray.size() > 1) {
+ if (DieArray.size() > (unsigned)keep_compile_unit_die) {
// std::vectors never get any smaller when resized to a smaller size,
// or when clear() or erase() are called, the size will report that it
// is smaller, but the memory allocated remains intact (call capacity()
@@ -227,8 +227,8 @@
// all compile units to stay loaded when they weren't needed. So we can end
// up parsing the DWARF and then throwing them all away to keep memory usage
// down.
- const bool clear_dies = extractDIEsIfNeeded(false) > 1;
-
+ const bool clear_dies = extractDIEsIfNeeded(false) > 1 &&
+ clear_dies_if_already_not_parsed;
DieArray[0].buildAddressRangeTable(this, debug_aranges);
// Keep memory down by clearing DIEs if this generate function
@@ -236,3 +236,13 @@
if (clear_dies)
clearDIEs(true);
}
+
+const DWARFDebugInfoEntryMinimal*
+DWARFCompileUnit::getFunctionDIEForAddress(int64_t address) {
+ size_t n = extractDIEsIfNeeded(false);
+ for (size_t i = 0; i != n; i++) {
+ if (DieArray[i].addressRangeContainsAddress(this, address))
+ return &DieArray[i];
+ }
+ return 0;
+}