Serialize the symbol tables

base/loader/symtab.cc:
    Add support for clearing out the symbol table
    Add support for serializing the symbol table (clear on unserialize)
    Don't allow empty symbols to be entered into the table
base/loader/symtab.hh:
    Add support for clearing out the symbol table
    Add support for serializing the symbol table
sim/system.cc:
    Serialize the kernel, console, and palcode symbol tables so that
    we can capture any dynamic symbols that are added and so that we
    don't have to have the same kernel binary around to get the
    symbols right

--HG--
extra : convert_revision : 779888c88aa530f3adcd37dc7600a335951d05f7

base/loader/symtab.cc

@@ -31,18 +31,29 @@
 #include <string>
 #include <vector>
 
-#include "sim/host.hh"
+#include "base/loader/symtab.hh"
 #include "base/misc.hh"
 #include "base/str.hh"
-#include "base/loader/symtab.hh"
+#include "sim/host.hh"
+#include "sim/serialize.hh"
 
 using namespace std;
 
 SymbolTable *debugSymbolTable = NULL;
 
+void
+SymbolTable::clear()
+{
+    addrTable.clear();
+    symbolTable.clear();
+}
+
 bool
 SymbolTable::insert(Addr address, string symbol)
 {
+    if (symbol.empty())
+        return false;
+
     if (!addrTable.insert(make_pair(address, symbol)).second)
         return false;
 
@@ -59,10 +70,8 @@ SymbolTable::load(const string &filename)
     string buffer;
     ifstream file(filename.c_str());
 
-    if (!file) {
-        cerr << "Can't open symbol table file " << filename << endl;
-        fatal("file error");
-    }
+    if (!file)
+        fatal("file error: Can't open symbol table file %s\n", filename);
 
     while (!file.eof()) {
         getline(file, buffer);
@@ -95,3 +104,34 @@ SymbolTable::load(const string &filename)
 
     return true;
 }
+
+void
+SymbolTable::serialize(const string &base, ostream &os)
+{
+    paramOut(os, base + ".size", addrTable.size());
+
+    int i = 0;
+    ATable::const_iterator p, end = addrTable.end();
+    for (p = addrTable.begin(); p != end; ++p) {
+        paramOut(os, csprintf("%s.addr_%d", base, i), p->first);
+        paramOut(os, csprintf("%s.symbol_%d", base, i), p->second);
+        ++i;
+    }
+}
+
+void
+SymbolTable::unserialize(const string &base, Checkpoint *cp,
+                         const string &section)
+{
+    clear();
+    int size;
+    paramIn(cp, section, base + ".size", size);
+    for (int i = 0; i < size; ++i) {
+        Addr addr;
+        std::string symbol;
+
+        paramIn(cp, section, csprintf("%s.addr_%d", base, i), addr);
+        paramIn(cp, section, csprintf("%s.symbol_%d", base, i), symbol);
+        insert(addr, symbol);
+    }
+}

base/loader/symtab.hh

@@ -29,9 +29,12 @@
 #ifndef __SYMTAB_HH__
 #define __SYMTAB_HH__
 
+#include <iosfwd>
 #include <map>
+
 #include "targetarch/isa_traits.hh"	// for Addr
 
+class Checkpoint;
 class SymbolTable
 {
   public:
@@ -61,12 +64,18 @@ class SymbolTable
     SymbolTable(const std::string &file) { load(file); }
     ~SymbolTable() {}
 
+    void clear();
     bool insert(Addr address, std::string symbol);
     bool load(const std::string &file);
 
     const ATable &getAddrTable() const { return addrTable; }
     const STable &getSymbolTable() const { return symbolTable; }
 
+  public:
+    void serialize(const std::string &base, std::ostream &os);
+    void unserialize(const std::string &base, Checkpoint *cp,
+                     const std::string &section);
+
   public:
     bool
     findSymbol(Addr address, std::string &symbol) const

sim/system.cc

@@ -333,6 +333,10 @@ void
 System::serialize(ostream &os)
 {
     kernelBinning->serialize(os);
+
+    kernelSymtab->serialize("kernel_symtab", os);
+    consoleSymtab->serialize("console_symtab", os);
+    palSymtab->serialize("pal_symtab", os);
 }
 
 
@@ -340,6 +344,10 @@ void
 System::unserialize(Checkpoint *cp, const string &section)
 {
     kernelBinning->unserialize(cp, section);
+
+    kernelSymtab->unserialize("kernel_symtab", cp, section);
+    consoleSymtab->unserialize("console_symtab", cp, section);
+    palSymtab->unserialize("pal_symtab", cp, section);
 }
 
 void