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llvm-project/llvm/tools/llvm-size/llvm-size.cpp

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//===-- llvm-size.cpp - Print the size of each object section -------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This program is a utility that works like traditional Unix "size",
// that is, it prints out the size of each section, and the total size of all
// sections.
//
//===----------------------------------------------------------------------===//
#include "llvm/ADT/APInt.h"
#include "llvm/Object/Archive.h"
#include "llvm/Object/ObjectFile.h"
#include "llvm/Support/Casting.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/Format.h"
#include "llvm/Support/ManagedStatic.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/PrettyStackTrace.h"
#include "llvm/Support/Signals.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Support/system_error.h"
#include <algorithm>
#include <string>
using namespace llvm;
using namespace object;
enum OutputFormatTy {berkeley, sysv};
static cl::opt<OutputFormatTy>
OutputFormat("format",
cl::desc("Specify output format"),
cl::values(clEnumVal(sysv, "System V format"),
clEnumVal(berkeley, "Berkeley format"),
clEnumValEnd),
cl::init(berkeley));
static cl::opt<OutputFormatTy>
OutputFormatShort(cl::desc("Specify output format"),
cl::values(clEnumValN(sysv, "A", "System V format"),
clEnumValN(berkeley, "B", "Berkeley format"),
clEnumValEnd),
cl::init(berkeley));
enum RadixTy {octal = 8, decimal = 10, hexadecimal = 16};
static cl::opt<unsigned int>
Radix("-radix",
cl::desc("Print size in radix. Only 8, 10, and 16 are valid"),
cl::init(decimal));
static cl::opt<RadixTy>
RadixShort(cl::desc("Print size in radix:"),
cl::values(clEnumValN(octal, "o", "Print size in octal"),
clEnumValN(decimal, "d", "Print size in decimal"),
clEnumValN(hexadecimal, "x", "Print size in hexadecimal"),
clEnumValEnd),
cl::init(decimal));
static cl::list<std::string>
InputFilenames(cl::Positional, cl::desc("<input files>"),
cl::ZeroOrMore);
static std::string ToolName;
/// @brief If ec is not success, print the error and return true.
static bool error(error_code ec) {
if (!ec) return false;
outs() << ToolName << ": error reading file: " << ec.message() << ".\n";
outs().flush();
return true;
}
/// @brief Get the length of the string that represents @p num in Radix
/// including the leading 0x or 0 for hexadecimal and octal respectively.
static size_t getNumLengthAsString(uint64_t num) {
APInt conv(64, num);
SmallString<32> result;
conv.toString(result, Radix, false, true);
return result.size();
}
/// @brief Print the size of each section in @p o.
///
/// The format used is determined by @c OutputFormat and @c Radix.
static void PrintObjectSectionSizes(ObjectFile *o) {
uint64_t total = 0;
std::string fmtbuf;
raw_string_ostream fmt(fmtbuf);
const char *radix_fmt = 0;
switch (Radix) {
case octal:
radix_fmt = PRIo64;
break;
case decimal:
radix_fmt = PRIu64;
break;
case hexadecimal:
radix_fmt = PRIx64;
break;
}
if (OutputFormat == sysv) {
// Run two passes over all sections. The first gets the lengths needed for
// formatting the output. The second actually does the output.
std::size_t max_name_len = strlen("section");
std::size_t max_size_len = strlen("size");
std::size_t max_addr_len = strlen("addr");
error_code ec;
for (section_iterator i = o->begin_sections(),
e = o->end_sections(); i != e;
i.increment(ec)) {
if (error(ec))
return;
uint64_t size = 0;
if (error(i->getSize(size)))
return;
total += size;
StringRef name;
uint64_t addr = 0;
if (error(i->getName(name))) return;
if (error(i->getAddress(addr))) return;
max_name_len = std::max(max_name_len, name.size());
max_size_len = std::max(max_size_len, getNumLengthAsString(size));
max_addr_len = std::max(max_addr_len, getNumLengthAsString(addr));
}
// Add extra padding.
max_name_len += 2;
max_size_len += 2;
max_addr_len += 2;
// Setup header format.
fmt << "%-" << max_name_len << "s "
<< "%" << max_size_len << "s "
<< "%" << max_addr_len << "s\n";
// Print header
outs() << format(fmt.str().c_str(),
static_cast<const char*>("section"),
static_cast<const char*>("size"),
static_cast<const char*>("addr"));
fmtbuf.clear();
// Setup per section format.
fmt << "%-" << max_name_len << "s "
<< "%#" << max_size_len << radix_fmt << " "
<< "%#" << max_addr_len << radix_fmt << "\n";
// Print each section.
for (section_iterator i = o->begin_sections(),
e = o->end_sections(); i != e;
i.increment(ec)) {
if (error(ec))
return;
StringRef name;
uint64_t size = 0;
uint64_t addr = 0;
if (error(i->getName(name))) return;
if (error(i->getSize(size))) return;
if (error(i->getAddress(addr))) return;
std::string namestr = name;
outs() << format(fmt.str().c_str(),
namestr.c_str(),
size,
addr);
}
// Print total.
fmtbuf.clear();
fmt << "%-" << max_name_len << "s "
<< "%#" << max_size_len << radix_fmt << "\n";
outs() << format(fmt.str().c_str(),
static_cast<const char*>("Total"),
total);
} else {
// The Berkeley format does not display individual section sizes. It
// displays the cumulative size for each section type.
uint64_t total_text = 0;
uint64_t total_data = 0;
uint64_t total_bss = 0;
// Make one pass over the section table to calculate sizes.
error_code ec;
for (section_iterator i = o->begin_sections(),
e = o->end_sections(); i != e;
i.increment(ec)) {
if (error(ec))
return;
uint64_t size = 0;
bool isText = false;
bool isData = false;
bool isBSS = false;
if (error(i->getSize(size))) return;
if (error(i->isText(isText))) return;
if (error(i->isData(isData))) return;
if (error(i->isBSS(isBSS))) return;
if (isText)
total_text += size;
else if (isData)
total_data += size;
else if (isBSS)
total_bss += size;
}
total = total_text + total_data + total_bss;
// Print result.
fmt << "%#7" << radix_fmt << " "
<< "%#7" << radix_fmt << " "
<< "%#7" << radix_fmt << " ";
outs() << format(fmt.str().c_str(),
total_text,
total_data,
total_bss);
fmtbuf.clear();
fmt << "%7" << (Radix == octal ? PRIo64 : PRIu64) << " "
<< "%7" PRIx64 " ";
outs() << format(fmt.str().c_str(),
total,
total);
}
}
/// @brief Print the section sizes for @p file. If @p file is an archive, print
/// the section sizes for each archive member.
static void PrintFileSectionSizes(StringRef file) {
// If file is not stdin, check that it exists.
if (file != "-") {
bool exists;
if (sys::fs::exists(file, exists) || !exists) {
errs() << ToolName << ": '" << file << "': " << "No such file\n";
return;
}
}
// Attempt to open the binary.
OwningPtr<Binary> binary;
if (error_code ec = createBinary(file, binary)) {
errs() << ToolName << ": " << file << ": " << ec.message() << ".\n";
return;
}
if (Archive *a = dyn_cast<Archive>(binary.get())) {
// This is an archive. Iterate over each member and display its sizes.
for (object::Archive::child_iterator i = a->begin_children(),
e = a->end_children(); i != e; ++i) {
OwningPtr<Binary> child;
if (error_code ec = i->getAsBinary(child)) {
errs() << ToolName << ": " << file << ": " << ec.message() << ".\n";
continue;
}
if (ObjectFile *o = dyn_cast<ObjectFile>(child.get())) {
if (OutputFormat == sysv)
outs() << o->getFileName() << " (ex " << a->getFileName()
<< "):\n";
PrintObjectSectionSizes(o);
if (OutputFormat == berkeley)
outs() << o->getFileName() << " (ex " << a->getFileName() << ")\n";
}
}
} else if (ObjectFile *o = dyn_cast<ObjectFile>(binary.get())) {
if (OutputFormat == sysv)
outs() << o->getFileName() << " :\n";
PrintObjectSectionSizes(o);
if (OutputFormat == berkeley)
outs() << o->getFileName() << "\n";
} else {
errs() << ToolName << ": " << file << ": " << "Unrecognized file type.\n";
}
// System V adds an extra newline at the end of each file.
if (OutputFormat == sysv)
outs() << "\n";
}
int main(int argc, char **argv) {
// Print a stack trace if we signal out.
sys::PrintStackTraceOnErrorSignal();
PrettyStackTraceProgram X(argc, argv);
llvm_shutdown_obj Y; // Call llvm_shutdown() on exit.
cl::ParseCommandLineOptions(argc, argv, "llvm object size dumper\n");
ToolName = argv[0];
if (OutputFormatShort.getNumOccurrences())
OutputFormat = OutputFormatShort;
if (RadixShort.getNumOccurrences())
Radix = RadixShort;
if (InputFilenames.size() == 0)
InputFilenames.push_back("a.out");
if (OutputFormat == berkeley)
outs() << " text data bss "
<< (Radix == octal ? "oct" : "dec")
<< " hex filename\n";
std::for_each(InputFilenames.begin(), InputFilenames.end(),
PrintFileSectionSizes);
return 0;
}
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