[binutils-gdb/origin/users/ssbssa/pdb-reader-preview] PDB: cache types

[Hannes Domani <ssbssa@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=e4405d097d465efe60f42992bcd2067ca530eb45

commit e4405d097d465efe60f42992bcd2067ca530eb45
Author: Hannes Domani <ssbssa@yahoo.de>
Date:   Mon Apr 11 17:27:46 2022 +0200

    PDB: cache types

Diff:
---
 gdb/windows-nat.c | 20 +++++++++++++++++++-
 1 file changed, 19 insertions(+), 1 deletion(-)

diff --git a/gdb/windows-nat.c b/gdb/windows-nat.c
index 59fbae765cd..e7930e931ef 100644
--- a/gdb/windows-nat.c
+++ b/gdb/windows-nat.c
@@ -3297,6 +3297,7 @@ struct pdb_line_info
   SymGetTypeInfo_ftype *fSymGetTypeInfo;
   DWORD64 addr;
   DWORD64 max_addr;
+  std::vector<type *> cache;
 };
 
 
@@ -3315,7 +3316,9 @@ static const char *wchar_to_objfile (pdb_line_info *pli, WCHAR *nameW)
   return pli->objfile->intern (name.get ());
 }
 
-static type *get_pdb_type (pdb_line_info *pli, DWORD type_index)
+static type *get_pdb_type (pdb_line_info *pli, DWORD type_index);
+
+static type *get_pdb_type_cached (pdb_line_info *pli, DWORD type_index)
 {
   const struct objfile_type *ot = objfile_type (pli->objfile);
 
@@ -3451,6 +3454,8 @@ static type *get_pdb_type (pdb_line_info *pli, DWORD type_index)
 	      type *t = alloc_type (pli->objfile);
 	      INIT_CPLUS_SPECIFIC (t);
 
+	      pli->cache[type_index] = t;
+
 	      t->set_name (wchar_to_objfile (pli, nameW));
 
 	      if (udtkind == UdtUnion)
@@ -3517,6 +3522,19 @@ static type *get_pdb_type (pdb_line_info *pli, DWORD type_index)
   return ot->builtin_void;
 }
 
+static type *get_pdb_type (pdb_line_info *pli, DWORD type_index)
+{
+  if (type_index >= pli->cache.size ())
+    pli->cache.resize (type_index + 1, nullptr);
+  else if (pli->cache[type_index] != nullptr)
+    return pli->cache[type_index];
+
+  type *t = get_pdb_type_cached (pli, type_index);
+  pli->cache[type_index] = t;
+
+  return t;
+}
+
 static BOOL CALLBACK symbol_callback(PSYMBOL_INFO si,
     ULONG /*SymbolSize*/, PVOID UserContext)
 {