Look at this simple plugins code ( All sources are at the end of this mail )
bug.cpp
compile with
g++ -shared -I/usr/local/lib/gcc/i686-pc-linux-gnu/4.5.0/plugin/include -DUNIX
-g -Wall -Werror -O0 -fPIC -DPIC -o libbug.so bug.cpp
than ran this plugins on example.cpp with
g++ -S -fplugin=libbug.so example.cpp
the output
starting libbug
processing example.cpp
unused_f2 0 <------- decl saved tree is null
unused_f 0xb7409ad4
main 0xb7496c90
function_1 0xb7496c78
now add a function at the end of the file like example2.cpp
and run the plugins on it
starting libbug
processing example2.cpp
unused_f3 0 <----------- DECL_SAVED_TREE null
unused_f2 0xb754be28 <----------- DECL_SAVED_TREE != null
unused_f 0xb74bead4
main 0xb754bc90
function_1 0xb754bc78
It seem that the last (on file) / first (on list) function_decl has always
DECL_SAVED_TREE == null
Source codes
/* bug.cpp */
// GCC header includes to get the parse tree
// declarations. The order is important and
// doesn't follow any kind of logic.
//
#include "config.h"
/* Needed to undef because gcc-plugins redefine them */
#undef PACKAGE_BUGREPORT
#undef PACKAGE_NAME
#undef PACKAGE_STRING
#undef PACKAGE_TARNAME
#undef PACKAGE_VERSION
#include <stdlib.h>
#include <gmp.h>
#include <set>
#include <cstdlib> // Include before GCC poisons
// some declarations.
extern "C"
{
#include "gcc-plugin.h"
#include "plugin-version.h"
#include "system.h"
#include "coretypes.h"
#include "tree.h"
#include "intl.h"
#include "tm.h"
#include "diagnostic.h"
#include "c-common.h"
#include "c-pragma.h"
#include "cp/cp-tree.h"
}
#include <iostream>
#include "tree-iterator.h"
int plugin_is_GPL_compatible;
void collect (tree ns)
{
tree decl;
cp_binding_level* level (NAMESPACE_LEVEL (ns));
// Collect declarations.
//
for (decl = level->names; decl != 0; decl = TREE_CHAIN (decl))
{
if (DECL_IS_BUILTIN (decl))
continue;
if (TREE_CODE(decl) == FUNCTION_DECL)
std::cerr << IDENTIFIER_POINTER(DECL_NAME(decl)) << " " << DECL_SAVED_TREE(decl) << "\n";
}
}
extern "C" void gate_callback (void*, void*)
{
// If there were errors during compilation,
// let GCC handle the exit.
//
if (errorcount || sorrycount)
return;
int r (0);
//
// Process AST. Issue diagnostics and set r
// to 1 in case of an error.
//
std::cerr << "processing " << main_input_filename << "\n";
collect (global_namespace);
exit (r);
}
extern "C" int plugin_init (plugin_name_args* info, plugin_gcc_version* ver)
{
if (!plugin_default_version_check (ver, &gcc_version))
return 1;
int r (0);
std::cerr << "starting " << info->base_name << "\n";
//
// Parse options if any.
//
// Disable assembly output.
//
asm_file_name = HOST_BIT_BUCKET;
// Register callbacks.
//
register_callback (info->base_name, PLUGIN_OVERRIDE_GATE, &gate_callback, 0);
return r;
}
/* example.cpp */
int test;
double var;
int function_1(int param1, int param2)
{
param1 = param1 * param2;
param2 = param1 + param2;
return param1 + param2;
}
int main(int argc, char **argv)
{
int var = 0;
double test = 0;
test = 5 * var + 7;
return 0;
}
int unused_f(int p1, int p2)
{
return p1 + p2;
}
int unused_f2(int p1)
{
p1 = p1 * p1;
return p1;
}
/* example2.cpp */
int test;
double var;
int function_1(int param1, int param2)
{
param1 = param1 * param2;
param2 = param1 + param2;
return param1 + param2;
}
int main(int argc, char **argv)
{
int var = 0;
double test = 0;
test = 5 * var + 7;
return 0;
}
int unused_f(int p1, int p2)
{
return p1 + p2;
}
int unused_f2(int p1)
{
p1 = p1 * p1;
return p1;
}
int unused_f3(int p1)
{
p1 = p1 / 2;
return p1;
}
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