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assembly.cc
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assembly.cc
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/*
* Copyright (c) 2015-2016 SUSE Linux GmbH
*
* Licensed under the GNU General Public License Version 2
* as published by the Free Software Foundation.
*
* See http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
* for details.
*
* Author: Joerg Roedel <[email protected]>
*/
#include <functional>
#include <algorithm>
#include <iostream>
#include <sstream>
#include <fstream>
#include <vector>
#include <stack>
#include <map>
#include <set>
#include <ctype.h>
#include "assembly.h"
#include "helper.h"
namespace assembly {
static const struct __stmt_map {
const char *str;
stmt_type type;
} stmt_map[] = {
{ .str = ".file", .type = stmt_type::DOTFILE },
{ .str = ".section", .type = stmt_type::SECTION },
{ .str = ".text", .type = stmt_type::TEXT },
{ .str = ".data", .type = stmt_type::DATA },
{ .str = ".bss", .type = stmt_type::BSS },
{ .str = ".type", .type = stmt_type::TYPE },
{ .str = ".globl", .type = stmt_type::GLOBAL },
{ .str = ".local", .type = stmt_type::LOCAL },
{ .str = ".string", .type = stmt_type::DATADEF },
{ .str = ".ascii", .type = stmt_type::DATADEF },
{ .str = ".byte", .type = stmt_type::DATADEF },
{ .str = ".short", .type = stmt_type::DATADEF },
{ .str = ".word", .type = stmt_type::DATADEF },
{ .str = ".long", .type = stmt_type::DATADEF },
{ .str = ".quad", .type = stmt_type::DATADEF },
{ .str = ".float", .type = stmt_type::DATADEF },
{ .str = ".double", .type = stmt_type::DATADEF },
{ .str = ".org", .type = stmt_type::DATADEF },
{ .str = ".zero", .type = stmt_type::DATADEF },
{ .str = ".size", .type = stmt_type::SIZE },
{ .str = ".align", .type = stmt_type::ALIGN },
{ .str = ".p2align", .type = stmt_type::ALIGN },
{ .str = ".comm", .type = stmt_type::COMM },
{ .str = ".lcomm", .type = stmt_type::LCOMM },
{ .str = ".popsection", .type = stmt_type::POPSECTION },
{ .str = ".pushsection", .type = stmt_type::PUSHSECTION },
{ .str = ".ident", .type = stmt_type::IDENT },
{ .str = ".loc", .type = stmt_type::LOC },
{ .str = ".cfi_startproc", .type = stmt_type::CFI_STARTPROC },
{ .str = ".cfi_endproc", .type = stmt_type::CFI_ENDPROC },
{ .str = ".cfi_offset", .type = stmt_type::CFI_OFFSET },
{ .str = ".cfi_remember_state", .type = stmt_type::CFI_REMEBER_STATE },
{ .str = ".cfi_restore_state", .type = stmt_type::CFI_RESTORE_STATE },
{ .str = ".cfi_restore", .type = stmt_type::CFI_RESTORE },
{ .str = ".cfi_def_cfa_offset", .type = stmt_type::CFI_DEF_CFA_OFFSET },
{ .str = ".cfi_def_cfa_register", .type = stmt_type::CFI_DEF_CFA_REGISTER },
{ .str = ".cfi_def_cfa", .type = stmt_type::CFI_DEF_CFA },
{ .str = ".cfi_sections", .type = stmt_type::CFI_SECTIONS },
{ .str = ".cfi_escape", .type = stmt_type::CFI_ESCAPE },
{ .str = ".balign", .type = stmt_type::ALIGN },
{ .str = ".weak", .type = stmt_type::WEAK },
{ .str = ".value", .type = stmt_type::VALUE },
{ .str = ".uleb128", .type = stmt_type::ULEB128 },
{ .str = ".sleb128", .type = stmt_type::SLEB128 },
{ .str = 0, .type = stmt_type::NOSTMT },
};
template<typename T> bool __ff(T f)
{
return (static_cast<int>(f) != 0);
}
// Forward declarations
static std::vector<std::string> line_to_statements(std::string line);
static bool is_valid_symbol(std::string);
static bool is_valid_instr_token(std::string);
static bool is_identifier_char(char c);
static bool is_register_char(char c);
static bool is_typeflag_char(char c);
static bool is_number_char(char c);
/////////////////////////////////////////////////////////////////////
//
// Class asm_token
//
/////////////////////////////////////////////////////////////////////
asm_token::asm_token(std::string token, enum token_type type)
: m_token(token), m_type(type)
{
}
std::string asm_token::serialize() const
{
std::ostringstream os;
os << '\'';
if (m_type == token_type::STRING)
os << '"';
os << m_token;
if (m_type == token_type::STRING)
os << '"';
os << '\'';
return os.str();
}
enum token_type asm_token::type() const
{
return m_type;
}
std::string asm_token::token() const
{
return m_token;
}
void asm_token::set(std::string token)
{
m_token = token;
}
/////////////////////////////////////////////////////////////////////
//
// Class asm_param
//
/////////////////////////////////////////////////////////////////////
template<typename T>
void asm_param::add_token(T&& t)
{
m_tokens.push_back(std::forward<T>(t));
}
void asm_param::reset()
{
m_tokens.clear();
}
size_t asm_param::tokens() const
{
return m_tokens.size();
}
void asm_param::token(asm_param::token_t::size_type idx,
std::function<void(enum token_type, std::string)> handler) const
{
if (m_tokens.size() <= idx)
return;
handler(m_tokens[idx].type(), m_tokens[idx].token());
}
void asm_param::for_each_token(token_handler handler)
{
for_each(m_tokens.begin(), m_tokens.end(), handler);
}
void asm_param::for_each_token(const_token_handler handler) const
{
for_each(m_tokens.begin(), m_tokens.end(), handler);
}
std::string asm_param::serialize() const
{
std::ostringstream os;
int count = 0;
for_each(m_tokens.begin(), m_tokens.end(), [&](const asm_token& t) {
if (count++)
os << ' ';
os << t.serialize();
});
return os.str();
}
/////////////////////////////////////////////////////////////////////
//
// Class asm_statement
//
/////////////////////////////////////////////////////////////////////
asm_statement::asm_statement(std::string stmt)
: m_stmt(std::move(stmt)), m_type(stmt_type::NOSTMT)
{
}
void asm_statement::rename_label(std::string from, std::string to)
{
for_each_param([&from, &to] (asm_param &p) {
p.for_each_token([&from, &to] (asm_token &t) {
if (t.type() != token_type::IDENTIFIER)
return;
if (t.token() == from)
t.set(to);
});
});
}
void asm_statement::analyze()
{
}
bool asm_statement::operator==(const asm_statement& stmt) const
{
if (m_type != stmt.m_type ||
m_instr != stmt.m_instr ||
m_params.size() != stmt.m_params.size())
return false;
auto size = m_params.size();
auto type = m_type;
bool ret = true;
for (size_t idx = 0; idx < size; ++idx) {
auto &p1 = m_params[idx];
auto &p2 = stmt.m_params[idx];
if (!ret)
break;
if (p1.tokens() != p2.tokens())
return false;
for (size_t jdx = 0; jdx < p1.tokens(); ++jdx) {
p1.token(jdx, [&jdx, &p2, &type, &ret](enum token_type t1, std::string s1) {
p2.token(jdx, [&t1, &s1, &type, &ret](enum token_type t2, std::string s2) {
if (t1 != t2) {
ret = false;
return;
}
ret = (s1 == s2);
if (ret)
return;
if (((type == stmt_type::INSTRUCTION) ||
(type == stmt_type::DATADEF)) &&
(t1 == token_type::IDENTIFIER))
ret = generated_symbol(s1) && generated_symbol(s2);
});
});
if (!ret)
break;
}
}
return ret;
}
bool asm_statement::operator!=(const asm_statement& stmt) const
{
return !operator==(stmt);
}
void asm_statement::type(enum stmt_type t)
{
m_type = t;
}
enum stmt_type asm_statement::type() const
{
return m_type;
}
std::string asm_statement::raw() const
{
return m_stmt;
}
std::string asm_statement::instr() const
{
return m_instr;
}
void asm_statement::set_instr(std::string instr)
{
m_instr = instr;
}
template<typename T>
void asm_statement::add_param(T&& p)
{
m_params.push_back(std::forward<T>(p));
}
void asm_statement::param(param_type::size_type idx,
param_handler p)
{
if (m_params.size() <= idx)
return;
p(m_params[idx]);
}
void asm_statement::param(param_type::size_type idx,
const_param_handler p) const
{
if (m_params.size() <= idx)
return;
p(m_params[idx]);
}
void asm_statement::for_each_param(param_handler handler)
{
std::for_each(m_params.begin(), m_params.end(), handler);
}
void asm_statement::for_each_param(const_param_handler handler) const
{
std::for_each(m_params.begin(), m_params.end(), handler);
}
void asm_statement::map_symbols(symbol_map &map, const asm_statement &stmt) const
{
auto size = m_params.size();
for (size_t idx = 0; idx < size; ++idx) {
auto &p1 = m_params[idx];
auto &p2 = stmt.m_params[idx];
for (size_t jdx = 0; jdx < p1.tokens(); ++jdx) {
p1.token(jdx, [&jdx, &p2, &map](enum token_type t1, std::string s1) {
p2.token(jdx, [&t1, &s1, &map](enum token_type t2, std::string s2) {
if ((t1 != token_type::IDENTIFIER) || !generated_symbol(s1))
return;
if (map.find(s1) != map.end() && map[s1] != s2) {
std::cerr << "WARNING: Symbol " << s1;
std::cerr << " maps to " << map[s1];
std::cerr << " and " << s2 << std::endl;
} else {
map[s1] = s2;
}
});
});
}
}
}
std::string asm_statement::serialize() const
{
std::ostringstream os;
int count = 0;
os << m_instr;
if (m_type == stmt_type::LABEL)
os << ':';
else
os << ' ';
for_each (m_params.begin(), m_params.end(), [&](const asm_param& p) {
if (count++)
os << ',';
os << p.serialize();
});
return os.str();
}
std::string asm_statement::statement() const
{
return m_stmt;
}
/////////////////////////////////////////////////////////////////////
//
// Class asm_type
//
/////////////////////////////////////////////////////////////////////
asm_type::asm_type(std::string stmt)
: asm_statement(std::move(stmt))
{
m_type = stmt_type::TYPE;
}
void asm_type::rename_label(std::string from, std::string to)
{
asm_statement::rename_label(from, to);
if (m_symbol == from)
m_symbol = to;
}
enum symbol_type asm_type::get_type() const
{
return m_stype;
}
std::string asm_type::get_symbol() const
{
return m_symbol;
}
void asm_type::analyze()
{
if (m_params.size() < 2)
return;
m_params[0].token(0, [&](enum token_type type, std::string token) {
if (type == token_type::IDENTIFIER)
m_symbol = token;
});
m_params[1].token(0, [&](enum token_type type, std::string token) {
if (type == token_type::TYPEFLAG) {
if (token == "@function")
m_stype = symbol_type::FUNCTION;
else if (token == "@object")
m_stype = symbol_type::OBJECT;
else
m_stype = symbol_type::UNKNOWN;
}
});
}
/////////////////////////////////////////////////////////////////////
//
// Class asm_label
//
/////////////////////////////////////////////////////////////////////
asm_label::asm_label(std::string stmt)
: asm_statement(stmt)
{
m_type = stmt_type::LABEL;
}
void asm_label::rename_label(std::string from, std::string to)
{
asm_statement::rename_label(from, to);
if (m_instr == from)
m_instr = to;
}
std::string asm_label::get_label() const
{
return m_instr;
}
/////////////////////////////////////////////////////////////////////
//
// Class asm_size
//
/////////////////////////////////////////////////////////////////////
asm_size::asm_size(std::string stmt)
: asm_statement(stmt)
{
m_type = stmt_type::SIZE;
}
void asm_size::rename_label(std::string from, std::string to)
{
asm_statement::rename_label(from, to);
if (m_symbol == from)
m_symbol = to;
}
void asm_size::analyze()
{
if (m_params.size() < 2)
return;
m_params[0].token(0, [&](enum token_type type, std::string token) {
if (type == token_type::IDENTIFIER)
m_symbol = token;
});
}
std::string asm_size::get_symbol() const
{
return m_symbol;
}
/////////////////////////////////////////////////////////////////////
//
// Class asm_section
//
/////////////////////////////////////////////////////////////////////
asm_section::asm_section(std::string stmt)
: asm_statement(stmt)
{
m_type = stmt_type::SECTION;
}
void asm_section::rename_label(std::string from, std::string to)
{
// Do nothing - we don't rename section names
}
void asm_section::analyze()
{
auto size = m_params.size();
if (size < 1)
return;
m_params[0].token(0, [&](enum token_type type, std::string token) {
if (type == token_type::IDENTIFIER)
m_name = token;
});
if (size < 2)
return;
m_params[1].token(0, [&](enum token_type type, std::string token) {
if (type == token_type::STRING)
m_flags = token;
});
m_executable = (m_flags.find_first_of("x") != std::string::npos);
}
std::string asm_section::get_name() const
{
return m_name;
}
bool asm_section::executable() const
{
return m_executable;
}
/////////////////////////////////////////////////////////////////////
//
// Class asm_comm
//
/////////////////////////////////////////////////////////////////////
asm_comm::asm_comm(std::string stmt)
: asm_statement(stmt), m_symbol(), m_alignment(0), m_size(0)
{
m_type = stmt_type::COMM;
}
void asm_comm::rename_label(std::string from, std::string to)
{
asm_statement::rename_label(from, to);
if (m_symbol == from)
m_symbol = to;
}
void asm_comm::analyze()
{
auto size = m_params.size();
if (size < 1)
return;
m_params[0].token(0, [&](enum token_type type, std::string token) {
if (type == token_type::IDENTIFIER)
m_symbol = token;
});
if (size < 2)
return;
m_params[1].token(0, [&](enum token_type type, std::string token) {
if (type == token_type::NUMBER) {
std::istringstream is(token);
is >> m_size;
}
});
if (size < 3)
return;
m_params[2].token(0, [&](enum token_type type, std::string token) {
if (type == token_type::NUMBER) {
std::istringstream is(token);
is >> m_alignment;
}
});
}
std::string asm_comm::get_symbol() const
{
return m_symbol;
}
/////////////////////////////////////////////////////////////////////
//
// Struct asm_symbol
//
/////////////////////////////////////////////////////////////////////
asm_symbol::asm_symbol()
: m_idx(0), m_size_idx(0), m_section_idx(0), m_align_idx(0), m_type_idx(0),
m_type(symbol_type::UNKNOWN), m_scope(symbol_scope::UNKNOWN)
{
}
/////////////////////////////////////////////////////////////////////
//
// Class asm_object
//
/////////////////////////////////////////////////////////////////////
asm_object::asm_object(std::string name)
: m_name(name)
{
}
void asm_object::add_statement(const std::unique_ptr<asm_statement> &stmt)
{
m_statements.push_back(copy_statement(stmt));
}
void asm_object::for_each_statement(std::function<void(asm_statement&)> handler)
{
for (auto it = m_statements.begin(), end = m_statements.end(); it != end; ++it)
handler(*(*it));
}
diff::size_type asm_object::elements() const
{
return static_cast<diff::size_type>(m_statements.size());
}
const asm_statement& asm_object::element(diff::size_type idx) const
{
const asm_statement *ptr = m_statements[idx].get();
return *ptr;
}
std::vector<std::string> asm_object::get_symbols() const
{
std::map<std::string, bool> found;
std::vector<std::string> symbols;
// Keep the symbols in a map first to filter out duplicates
for (auto it = m_statements.begin(), end = m_statements.end();
it != end; ++it) {
if ((*it)->type() == stmt_type::LABEL) {
asm_label *label = dynamic_cast<asm_label*>((*it).get());
// Ignore in-function labels in the symbol-array
found[label->get_label()] = false;
continue;
}
if ((*it)->type() != stmt_type::INSTRUCTION &&
(*it)->type() != stmt_type::DATADEF)
continue;
(*it)->for_each_param([&found](const asm_param &p) {
p.for_each_token([&found](const asm_token &t) {
if (t.type() != token_type::IDENTIFIER)
return;
// Don't overwrite 'false' values
if (found.find(t.token()) == found.end())
found[t.token()] = true;
});
});
}
// Now copy the symbols into the vector
for (auto it : found) {
if (it.second)
symbols.push_back(it.first);
}
return symbols;
}
void asm_object::get_symbol_map(symbol_map &map, const asm_object &fn) const
{
auto size = m_statements.size();
decltype(size) i;
for (i = 0; i < size; ++i) {
if ((m_statements[i]->type() != stmt_type::INSTRUCTION) &&
(m_statements[i]->type() != stmt_type::DATADEF))
continue;
m_statements[i]->map_symbols(map, *(fn.m_statements[i]));
}
}
/////////////////////////////////////////////////////////////////////
//
// Class asm_file
//
/////////////////////////////////////////////////////////////////////
void asm_file::cleanup_symbol_table()
{
// We remove label-only symbols, which are labels within
// functions
std::set<std::string> labels;
for (auto &sym : m_symbols) {
if (sym.second.m_type != symbol_type::FUNCTION)
continue;
auto fn = get_function(sym.first, func_flags::NONE);
if (fn == nullptr)
continue;
fn->for_each_statement([&labels](asm_statement &stmt) {
if (stmt.type() != stmt_type::LABEL)
return;
asm_label *label = dynamic_cast<asm_label*>(&stmt);
labels.insert(label->get_label());
});
}
for (auto item : labels)
m_symbols.erase(item);
}
void asm_file::load()
{
std::ifstream in(m_filename.c_str());
std::stack<size_t> sections;
std::map<std::string, size_t> first_sec; // Where the section was first seen
size_t curr_section_idx = 0;
size_t curr_align_idx = 0;
if (!in.is_open())
throw std::runtime_error(std::string("Can't open input file ") + m_filename);
while (!in.eof()) {
char buffer[1024];
std::string line;
in.getline(buffer, 1024);
if (in.fail() && !in.eof())
throw std::runtime_error("Can't parse input data");
line = trim(strip_comment(buffer));
std::vector<std::string> stmts = line_to_statements(line);
for (auto it = stmts.begin(), end = stmts.end(); it != end; ++it) {
// first check for labels
bool is_label = true;
std::string input;
int pos = it->size();
for (int i = 0, e = it->size(); i != e && is_label; ++i) {
if (!(is_identifier_char((*it)[i]) || (*it)[i] == ':'))
break;
if ((*it)[i] == ':') {
pos = i + 1;
break;
}
}
input = it->substr(0, pos);
*it = it->substr(pos);
std::unique_ptr<asm_statement> stmt = parse_statement(input);
if (stmt == nullptr)
continue;
if (stmt->type() == stmt_type::LABEL) {
asm_label *label = dynamic_cast<asm_label*>(stmt.get());
std::string name = label->get_label();
// Symbols starting with '.' have local scope only
if (is_valid_symbol(name)) {
m_symbols[name].m_idx = m_statements.size();
m_symbols[name].m_section_idx = curr_section_idx;
if (curr_align_idx)
m_symbols[name].m_align_idx = curr_align_idx;
if (m_symbols[name].m_scope == symbol_scope::UNKNOWN &&
name[0] != '.')
m_symbols[name].m_scope = symbol_scope::GLOBAL;
if (m_symbols[name].m_scope == symbol_scope::UNKNOWN &&
name[0] == '.')
m_symbols[name].m_scope = symbol_scope::LOCAL;
if (m_symbols[name].m_type == symbol_type::UNKNOWN)
m_symbols[name].m_type = symbol_type::OBJECT;
}
} else if (stmt->type() == stmt_type::COMM) {
asm_comm *comm = dynamic_cast<asm_comm*>(stmt.get());
std::string name = comm->get_symbol();
if (is_valid_symbol(name)) {
m_symbols[name].m_idx = m_statements.size();
m_symbols[name].m_section_idx = curr_section_idx;
m_symbols[name].m_type = symbol_type::OBJECT;
if (curr_align_idx)
m_symbols[name].m_align_idx = curr_align_idx;
if (m_symbols[name].m_scope == symbol_scope::UNKNOWN)
m_symbols[name].m_scope = symbol_scope::GLOBAL;
}
// .comm statements change location pointer
curr_align_idx = 0;
} else if (stmt->type() == stmt_type::TYPE) {
asm_type *type = dynamic_cast<asm_type*>(stmt.get());
std::string symbol(type->get_symbol());
if (symbol.size() != 0) {
m_symbols[symbol].m_type = type->get_type();
m_symbols[symbol].m_type_idx = m_statements.size();
if (m_symbols[symbol].m_scope == symbol_scope::UNKNOWN) {
if (symbol[0] == '.')
m_symbols[symbol].m_scope = symbol_scope::LOCAL;
else
m_symbols[symbol].m_scope = symbol_scope::GLOBAL;
}
}
} else if (stmt->type() == stmt_type::LOCAL ||
stmt->type() == stmt_type::GLOBAL) {
std::string symbol;
stmt->param(0, [&symbol](asm_param& p) {
p.token(0, [&symbol](enum token_type t, std::string s) {
if (t == token_type::IDENTIFIER)
symbol = s;
});
});
if (symbol != "") {
m_symbols[symbol].m_scope =
stmt->type() == stmt_type::LOCAL ?
symbol_scope::LOCAL :
symbol_scope::GLOBAL;
}
} else if (stmt->type() == stmt_type::SIZE) {
asm_size *size = dynamic_cast<asm_size*>(stmt.get());
std::string symbol(size->get_symbol());
m_symbols[symbol].m_size_idx = m_statements.size();
} else if (stmt->type() == stmt_type::TEXT ||
stmt->type() == stmt_type::DATA ||
stmt->type() == stmt_type::BSS ||
stmt->type() == stmt_type::SECTION) {
if (stmt->type() == stmt_type::SECTION) {
asm_section *sec = dynamic_cast<asm_section*>(stmt.get());
std::string secname = sec->get_name();
if (first_sec.find(secname) == first_sec.end())
first_sec[secname] = m_statements.size();
curr_section_idx = first_sec[secname];
} else {
curr_section_idx = m_statements.size();
}
} else if (stmt->type() == stmt_type::PUSHSECTION) {
sections.push(curr_section_idx);
} else if (stmt->type() == stmt_type::POPSECTION) {
if (sections.empty()) {
std::cerr << "Warning: .popsection on empty stack" << std::endl;
} else {
curr_section_idx = sections.top();
sections.pop();
}
} else if (stmt->type() == stmt_type::ALIGN) {
curr_align_idx = m_statements.size();
} else {
curr_align_idx = 0;
}
m_statements.push_back(std::move(stmt));
}
}
cleanup_symbol_table();
}
const asm_statement& asm_file::stmt(unsigned idx) const
{
return *m_statements[idx];
}
void asm_file::for_each_symbol(std::function<void(std::string, asm_symbol)> handler)
{
for (auto it = m_symbols.begin(), end = m_symbols.end(); it != end; ++it)
handler(it->first, it->second);
}
bool asm_file::has_symbol(std::string symbol) const
{
return m_symbols.find(symbol) != m_symbols.end();
}
const asm_symbol& asm_file::get_symbol(std::string symbol) const
{
auto s = m_symbols.find(symbol);
if (s == m_symbols.end())
throw std::runtime_error("No such symbol: " + symbol);
return s->second;
}
bool asm_file::has_function(std::string symbol) const
{
auto it = m_symbols.find(symbol);
if (it == m_symbols.end())
return false;
return (it->second.m_type == symbol_type::FUNCTION);
}
std::unique_ptr<asm_object> asm_file::get_function(std::string name, enum func_flags flags) const
{
std::unique_ptr<asm_object> fn(nullptr);
if (!has_function(name))
return fn;
fn = std::unique_ptr<asm_object>(new asm_object(name));
auto it_sym = m_symbols.find(name);
auto it = m_statements.begin() + it_sym->second.m_idx + 1;
for (auto end = m_statements.end(); it != end; ++it) {
if ((*it)->type() == stmt_type::SIZE) {
asm_size *size = dynamic_cast<asm_size*>(it->get());
if (size->get_symbol() == name)
break;
}
if (__ff(flags & func_flags::STRIP_DEBUG)) {
if ((*it)->type() == stmt_type::DOTFILE)
continue;
if ((*it)->type() == stmt_type::LOC)
continue;
if ((*it)->type() == stmt_type::LABEL) {
asm_label *label = dynamic_cast<asm_label*>(it->get());
std::string name = label->get_label();
if (name.size() >= 3 && name.substr(0, 2) == ".L" && isalpha(name[2]))
continue;
}
}
fn->add_statement(*it);
}
if (__ff(flags & func_flags::NORMALIZE)) {
std::map<std::string, std::string> symbols;
int counter = 0;
// Generate map of replacement symbols
fn->for_each_statement([&symbols, &counter](asm_statement& stmt) {
if (stmt.type() != stmt_type::LABEL)
return;
asm_label *label = dynamic_cast<asm_label*>(&stmt);
std::string name = label->get_label();
// Only replace symbols generated by the compiler
if ((name.size() > 2) && (name.substr(0, 2) != ".L"))
return;
// Generate the replacement symbol and put in into the map
std::ostringstream os;
os << "~ASMTOOL" << counter++;
symbols[name] = os.str();
});
// Now do the replacement
for (auto it = symbols.begin(), end = symbols.end(); it != end; ++it) {
fn->for_each_statement([&it](asm_statement& stmt) {
stmt.rename_label(it->first, it->second);
});
}