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Improvements to BSD-licensed DTC.

Browse Source 
- Numerous crash and bug fixes
- Improved warning and error messages
- Permit multiple labels on nodes and properties
- Fix node@address references
- Add support for /delete-node/
- Consume whitespace after a node
- Read the next token before the second /memreserve/
- Fix parsing of whitespace
- Clean up /delete-node/ and add support for /delete-property/
- Handle /delete-node/ specifying a unit address

Obtained from:	https://github.com/davidchisnall/dtc @df5ede4
This commit is contained in:
emaste 2016-10-07 12:57:35 +00:00
parent 0ce9d71278
commit 6b647a7ab8
12 changed files with 1377 additions and 739 deletions
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46
usr.bin/dtc/checking.cc
View File

@ -33,7 +33,7 @@
#include "checking.hh"
#include <stdio.h>
using std::string;
namespace dtc
{
@ -44,6 +44,30 @@ namespace checking
namespace
{
struct deleted_node_checker : public checker
{
deleted_node_checker(const char *name) : checker(name) {}
virtual bool check_node(device_tree *, const node_ptr &n)
{
auto &deleted = n->deleted_child_nodes();
if (deleted.empty())
{
return true;
}
bool plural = deleted.size() > 1;
string errmsg("Attempts to delete ");
errmsg += plural ? "nodes" : "node";
errmsg += " that ";
errmsg += plural ? "were" : "was";
errmsg += " not added in merge: ";
for (auto &d : deleted)
{
errmsg += d;
}
report_error(errmsg.c_str());
return false;
}
};
/**
* Checker that verifies that every node that has children has
* #address-cells and #size-cells properties.
@ -73,16 +97,16 @@ namespace
}
if (found_size && found_address)
{
break;
break;
}
}
if (!found_address)
{
report_error("Missing #address-cells property");
report_error("Missing #address-cells property");
}
if (!found_size)
{
report_error("Missing #size-cells property");
report_error("Missing #size-cells property");
}
return found_address && found_size;
}
@ -126,11 +150,11 @@ checker::report_error(const char *errmsg)
for (auto &p : path)
{
putc('/', stderr);
p.first.dump();
puts(p.first.c_str());
if (!(p.second.empty()))
{
putc('@', stderr);
p.second.dump();
puts(p.second.c_str());
}
}
fprintf(stderr, " [-W%s]\n", checker_name);
@ -167,7 +191,7 @@ property_size_checker::check(device_tree *, const node_ptr &, property_ptr p)
template<property_value::value_type T>
void
check_manager::add_property_type_checker(const char *name, string prop)
check_manager::add_property_type_checker(const char *name, const string &prop)
{
checkers.insert(std::make_pair(string(name),
new property_type_checker<T>(name, prop)));
@ -175,7 +199,7 @@ check_manager::add_property_type_checker(const char *name, string prop)
void
check_manager::add_property_size_checker(const char *name,
string prop,
const string &prop,
uint32_t size)
{
checkers.insert(std::make_pair(string(name),
@ -207,6 +231,8 @@ check_manager::check_manager()
add_property_size_checker("type-phandle", string("phandle"), 4);
disabled_checkers.insert(std::make_pair(string("cells-attributes"),
new address_cells_checker("cells-attributes")));
checkers.insert(std::make_pair(string("deleted-nodes"),
new deleted_node_checker("deleted-nodes")));
}
bool
@ -225,7 +251,7 @@ check_manager::run_checks(device_tree *tree, bool keep_going)
}
bool
check_manager::disable_checker(string name)
check_manager::disable_checker(const string &name)
{
auto checker = checkers.find(name);
if (checker != checkers.end())
@ -239,7 +265,7 @@ check_manager::disable_checker(string name)
}
bool
check_manager::enable_checker(string name)
check_manager::enable_checker(const string &name)
{
auto checker = disabled_checkers.find(name);
if (checker != disabled_checkers.end())

42
usr.bin/dtc/checking.hh
View File

@ -32,7 +32,7 @@
#ifndef _CHECKING_HH_
#define _CHECKING_HH_
#include "string.hh"
#include <string>
#include "fdt.hh"
namespace dtc
@ -58,7 +58,7 @@ class checker
/**
* The name of the checker. This is used for printing error messages
* and for enabling / disabling specific checkers from the command
* line.
* line.
*/
const char *checker_name;
/**
@ -118,18 +118,18 @@ class property_checker : public checker
/**
* The name of the property that this checker is looking for.
*/
string key;
std::string key;
public:
/**
* Implementation of the generic property-checking method that checks
* for a property with the name specified in the constructor
* for a property with the name specified in the constructor.
*/
virtual bool check_property(device_tree *tree, const node_ptr &n, property_ptr p);
/**
* Constructor. Takes the name of the checker and the name of the
* property to check.
*/
property_checker(const char* name, string property_name)
property_checker(const char* name, const std::string &property_name)
: checker(name), key(property_name) {}
/**
* The check method, which subclasses should implement.
@ -147,7 +147,7 @@ struct property_type_checker : public property_checker
* Constructor, takes the name of the checker and the name of the
* property to check as arguments.
*/
property_type_checker(const char* name, string property_name) :
property_type_checker(const char* name, const std::string &property_name) :
property_checker(name, property_name) {}
virtual bool check(device_tree *tree, const node_ptr &n, property_ptr p) = 0;
};
@ -158,7 +158,7 @@ struct property_type_checker : public property_checker
template<>
struct property_type_checker <property_value::EMPTY> : public property_checker
{
property_type_checker(const char* name, string property_name) :
property_type_checker(const char* name, const std::string &property_name) :
property_checker(name, property_name) {}
virtual bool check(device_tree *, const node_ptr &, property_ptr p)
{
@ -173,7 +173,7 @@ struct property_type_checker <property_value::EMPTY> : public property_checker
template<>
struct property_type_checker <property_value::STRING> : public property_checker
{
property_type_checker(const char* name, string property_name) :
property_type_checker(const char* name, const std::string &property_name) :
property_checker(name, property_name) {}
virtual bool check(device_tree *, const node_ptr &, property_ptr p)
{
@ -188,7 +188,7 @@ template<>
struct property_type_checker <property_value::STRING_LIST> :
public property_checker
{
property_type_checker(const char* name, string property_name) :
property_type_checker(const char* name, const std::string &property_name) :
property_checker(name, property_name) {}
virtual bool check(device_tree *, const node_ptr &, property_ptr p)
{
@ -211,11 +211,11 @@ struct property_type_checker <property_value::STRING_LIST> :
template<>
struct property_type_checker <property_value::PHANDLE> : public property_checker
{
property_type_checker(const char* name, string property_name) :
property_type_checker(const char* name, const std::string &property_name) :
property_checker(name, property_name) {}
virtual bool check(device_tree *tree, const node_ptr &, property_ptr p)
{
return (p->begin() + 1 == p->end()) &&
return (p->begin() + 1 == p->end()) &&
(tree->referenced_node(*p->begin()) != 0);
}
};
@ -234,7 +234,9 @@ struct property_size_checker : public property_checker
* Constructor, takes the name of the checker, the name of the property
* to check, and its expected size as arguments.
*/
property_size_checker(const char* name, string property_name, uint32_t bytes)
property_size_checker(const char* name,
const std::string &property_name,
uint32_t bytes)
: property_checker(name, property_name), size(bytes) {}
/**
* Check, validates that the property has the correct size.
@ -254,26 +256,26 @@ class check_manager
* disabling checkers from the command line. When this manager runs,
* it will only run the checkers from this map.
*/
std::unordered_map<string, checker*> checkers;
std::unordered_map<std::string, checker*> checkers;
/**
* The disabled checkers. Moving checkers to this list disables them,
* but allows them to be easily moved back.
*/
std::unordered_map<string, checker*> disabled_checkers;
std::unordered_map<std::string, checker*> disabled_checkers;
/**
* Helper function for adding a property value checker.
*/
template<property_value::value_type T>
void add_property_type_checker(const char *name, string prop);
void add_property_type_checker(const char *name, const std::string &prop);
/**
* Helper function for adding a simple type checker.
*/
void add_property_type_checker(const char *name, string prop);
void add_property_type_checker(const char *name, const std::string &prop);
/**
* Helper function for adding a property value checker.
*/
void add_property_size_checker(const char *name,
string prop,
const std::string &prop,
uint32_t size);
public:
/**
@ -292,11 +294,11 @@ class check_manager
/**
* Disables the named checker.
*/
bool disable_checker(string name);
bool disable_checker(const std::string &name);
/**
* Enables the named checker.
* Enables the named checker.
*/
bool enable_checker(string name);
bool enable_checker(const std::string &name);
};
} // namespace checking

52
usr.bin/dtc/dtb.cc
View File

@ -36,6 +36,7 @@
#include <stdio.h>
#include <unistd.h>
using std::string;
namespace dtc
{
@ -51,9 +52,9 @@ void output_writer::write_data(byte_buffer b)
}
void
binary_writer::write_string(string name)
binary_writer::write_string(const string &name)
{
name.push_to_buffer(buffer);
push_string(buffer, name);
// Trailing nul
buffer.push_back(0);
}
@ -97,15 +98,6 @@ binary_writer::size()
return buffer.size();
}
void
asm_writer::write_string(const char *c)
{
while (*c)
{
buffer.push_back((uint8_t)*(c++));
}
}
void
asm_writer::write_line(const char *c)
{
@ -142,34 +134,44 @@ asm_writer::write_byte(uint8_t b)
}
void
asm_writer::write_label(string name)
asm_writer::write_label(const string &name)
{
write_line("\t.globl ");
name.push_to_buffer(buffer);
push_string(buffer, name);
buffer.push_back('\n');
name.push_to_buffer(buffer);
push_string(buffer, name);
buffer.push_back(':');
buffer.push_back('\n');
buffer.push_back('_');
name.push_to_buffer(buffer);
push_string(buffer, name);
buffer.push_back(':');
buffer.push_back('\n');
}
void
asm_writer::write_comment(string name)
asm_writer::write_comment(const string &name)
{
write_line("\t/* ");
name.push_to_buffer(buffer);
push_string(buffer, name);
write_string(" */\n");
}
void
asm_writer::write_string(string name)
asm_writer::write_string(const char *c)
{
while (*c)
{
buffer.push_back((uint8_t)*(c++));
}
}
void
asm_writer::write_string(const string &name)
{
write_line("\t.string \"");
name.push_to_buffer(buffer);
push_string(buffer, name);
write_line("\"\n");
bytes_written += name.size() + 1;
}
@ -231,8 +233,8 @@ asm_writer::size()
void
header::write(output_writer &out)
{
out.write_label(string("dt_blob_start"));
out.write_label(string("dt_header"));
out.write_label("dt_blob_start");
out.write_label("dt_header");
out.write_comment("magic");
out.write_data(magic);
out.write_comment("totalsize");
@ -275,7 +277,7 @@ header::read_dtb(input_buffer &input)
input.consume_binary(size_dt_struct);
}
uint32_t
string_table::add_string(string str)
string_table::add_string(const string &str)
{
auto old = string_offsets.find(str);
if (old == string_offsets.end())
@ -296,13 +298,13 @@ string_table::add_string(string str)
void
string_table::write(dtb::output_writer &writer)
{
writer.write_comment(string("Strings table."));
writer.write_label(string("dt_strings_start"));
writer.write_comment("Strings table.");
writer.write_label("dt_strings_start");
for (auto &i : strings)
{
writer.write_string(i);
}
writer.write_label(string("dt_strings_end"));
writer.write_label("dt_strings_end");
}
} // namespace dtb

36
usr.bin/dtc/dtb.hh
View File

@ -33,10 +33,13 @@
#ifndef _DTB_HH_
#define _DTB_HH_
#include <map>
#include "string.hh"
#include <string>
#include <assert.h>
#include "input_buffer.hh"
#include "util.hh"
namespace dtc
{
/**
@ -121,16 +124,16 @@ struct output_writer
* assembly output, where the labels become symbols that can be
* resolved at link time.
*/
virtual void write_label(string name) = 0;
virtual void write_label(const std::string &name) = 0;
/**
* Writes a comment into the output stream. Useful only when debugging
* the output.
*/
virtual void write_comment(string name) = 0;
virtual void write_comment(const std::string &name) = 0;
/**
* Writes a string. A nul terminator is implicitly added.
*/
virtual void write_string(string name) = 0;
virtual void write_string(const std::string &name) = 0;
/**
* Writes a single 8-bit value.
*/
@ -186,12 +189,12 @@ class binary_writer : public output_writer
* The binary format does not support labels, so this method
* does nothing.
*/
virtual void write_label(string) {}
virtual void write_label(const std::string &) {}
/**
* Comments are ignored by the binary writer.
*/
virtual void write_comment(string) {}
virtual void write_string(string name);
virtual void write_comment(const std::string&) {}
virtual void write_string(const std::string &name);
virtual void write_data(uint8_t v);
virtual void write_data(uint32_t v);
virtual void write_data(uint64_t v);
@ -224,10 +227,14 @@ class asm_writer : public output_writer
uint32_t bytes_written;
/**
* Writes a C string directly to the output as-is. This is mainly used
* for writing directives.
* Writes a string directly to the output as-is. This is the function that
* performs the real output.
*/
void write_string(const char *c);
/**
* Write a string to the output.
*/
void write_string(const std::string &c);
/**
* Writes the string, starting on a new line.
*/
@ -239,9 +246,8 @@ class asm_writer : public output_writer
void write_byte(uint8_t b);
public:
asm_writer() : byte_count(0), bytes_written(0) {}
virtual void write_label(string name);
virtual void write_comment(string name);
virtual void write_string(string name);
virtual void write_label(const std::string &name);
virtual void write_comment(const std::string &name);
virtual void write_data(uint8_t v);
virtual void write_data(uint32_t v);
virtual void write_data(uint64_t v);
@ -328,14 +334,14 @@ class string_table {
/**
* Map from strings to their offset.
*/
std::map<string, uint32_t> string_offsets;
std::map<std::string, uint32_t> string_offsets;
/**
* The strings, in the order in which they should be written to the
* output. The order must be stable - adding another string must not
* change the offset of any that we have already referenced - and so we
* simply write the strings in the order that they are passed.
*/
std::vector<string> strings;
std::vector<std::string> strings;
/**
* The current size of the strings section.
*/
@ -351,7 +357,7 @@ class string_table {
* will return its existing offset, otherwise it will return a new
* offset.
*/
uint32_t add_string(string str);
uint32_t add_string(const std::string &str);
/**
* Writes the strings table to the specified output.
*/

4
usr.bin/dtc/dtc.1
View File

@ -237,6 +237,10 @@ Checks that all nodes with children have both
and
.Va #size-cells
properties.
.It deleted-nodes
Checks that all
.Va /delete-node/
statements refer to nodes that are merged.
.El
.Sh EXAMPLES
The command:

41
usr.bin/dtc/dtc.cc
View File

@ -42,8 +42,10 @@
#include "fdt.hh"
#include "checking.hh"
#include "util.hh"
using namespace dtc;
using std::string;
/**
* The current major version of the tool.
@ -58,7 +60,7 @@ int version_minor = 4;
*/
int version_patch = 0;
static void usage(const char* argv0)
static void usage(const string &argv0)
{
fprintf(stderr, "Usage:\n"
"\t%s\t[-fhsv] [-b boot_cpu_id] [-d dependency_file]"
@ -67,7 +69,7 @@ static void usage(const char* argv0)
"[-O output_format]\n"
"\t\t[-o output_file] [-R entries] [-S bytes] [-p bytes]"
"[-V blob_version]\n"
"\t\t-W [no-]checker_name] input_file\n", basename((char*)argv0));
"\t\t-W [no-]checker_name] input_file\n", basename(argv0).c_str());
}
/**
@ -90,9 +92,8 @@ main(int argc, char **argv)
const char *in_file = "-";
FILE *depfile = 0;
bool debug_mode = false;
void (device_tree::*write_fn)(int) = &device_tree::write_binary;
void (device_tree::*read_fn)(const char*, FILE*) =
&device_tree::parse_dts;
auto write_fn = &device_tree::write_binary;
auto read_fn = &device_tree::parse_dts;
uint32_t boot_cpu;
bool boot_cpu_specified = false;
bool keep_going = false;
@ -115,12 +116,12 @@ main(int argc, char **argv)
return EXIT_SUCCESS;
case 'I':
{
string arg = string(optarg);
if (arg == string("dtb"))
string arg(optarg);
if (arg == "dtb")
{
read_fn = &device_tree::parse_dtb;
}
else if (arg == string("dts"))
else if (arg == "dts")
{
read_fn = &device_tree::parse_dts;
}
@ -133,16 +134,16 @@ main(int argc, char **argv)
}
case 'O':
{
string arg = string(optarg);
if (arg == string("dtb"))
string arg(optarg);
if (arg == "dtb")
{
write_fn = &device_tree::write_binary;
}
else if (arg == string("asm"))
else if (arg == "asm")
{
write_fn = &device_tree::write_asm;
}
else if (arg == string("dts"))
else if (arg == "dts")
{
write_fn = &device_tree::write_dts;
}
@ -168,7 +169,7 @@ main(int argc, char **argv)
debug_mode = true;
break;
case 'V':
if (string(optarg) != string("17"))
if (string(optarg) != "17")
{
fprintf(stderr, "Unknown output format version: %s\n", optarg);
return EXIT_FAILURE;
@ -180,7 +181,7 @@ main(int argc, char **argv)
{
fclose(depfile);
}
if (string(optarg) == string("-"))
if (string(optarg) == "-")
{
depfile = stdout;
}
@ -197,16 +198,16 @@ main(int argc, char **argv)
}
case 'H':
{
string arg = string(optarg);
if (arg == string("both"))
string arg(optarg);
if (arg == "both")
{
tree.set_phandle_format(device_tree::BOTH);
}
else if (arg == string("epapr"))
else if (arg == "epapr")
{
tree.set_phandle_format(device_tree::EPAPR);
}
else if (arg == string("linux"))
else if (arg == "linux")
{
tree.set_phandle_format(device_tree::LINUX);
}
@ -229,7 +230,7 @@ main(int argc, char **argv)
case 'W':
case 'E':
{
string arg = string(optarg);
string arg(optarg);
if ((arg.size() > 3) && (strncmp(optarg, "no-", 3) == 0))
{
arg = string(optarg+3);
@ -307,7 +308,7 @@ main(int argc, char **argv)
}
if (!(tree.is_valid() || keep_going))
{
fprintf(stderr, "Failed to parse tree. Unhappy face!\n");
fprintf(stderr, "Failed to parse tree.\n");
return EXIT_FAILURE;
}
clock_t c2 = clock();

551
usr.bin/dtc/fdt.cc
View File

@ -36,6 +36,7 @@
#include "dtb.hh"
#include <algorithm>
#include <sstream>
#include <ctype.h>
#include <fcntl.h>
@ -48,6 +49,8 @@
#include <sys/stat.h>
#include <errno.h>
using std::string;
namespace dtc
{
@ -78,7 +81,7 @@ property_value::push_to_buffer(byte_buffer &buffer)
}
else
{
string_data.push_to_buffer(buffer, true);
push_string(buffer, string_data, true);
// Trailing nul
buffer.push_back(0);
}
@ -172,7 +175,7 @@ property_value::write_as_string(FILE *file)
putc('"', file);
if (byte_data.empty())
{
string_data.print(file);
fputs(string_data.c_str(), file);
}
else
{
@ -240,31 +243,32 @@ property_value::write_as_bytes(FILE *file)
}
void
property::parse_string(input_buffer &input)
property::parse_string(text_input_buffer &input)
{
property_value v;
assert(input[0] == '"');
assert(*input == '"');
++input;
const char *start = (const char*)input;
int length = 0;
while (char c = input[0])
std::vector<char> bytes;
bool isEscaped = false;
while (char c = *input)
{
if (c == '"' && input[-1] != '\\')
if (c == '"' && !isEscaped)
{
input.consume('"');
break;
}
isEscaped = (c == '\\');
bytes.push_back(c);
++input;
++length;
}
v.string_data = string(start, length);
v.string_data = string(bytes.begin(), bytes.end());
values.push_back(v);
}
void
property::parse_cells(input_buffer &input, int cell_size)
property::parse_cells(text_input_buffer &input, int cell_size)
{
assert(input[0] == '<');
assert(*input == '<');
++input;
property_value v;
input.next_token();
@ -282,9 +286,18 @@ property::parse_cells(input_buffer &input, int cell_size)
return;
}
input.next_token();
// FIXME: We should support full paths here, but we
// don't.
string referenced = string::parse_node_name(input);
bool isPath = false;
string referenced;
if (!input.consume('{'))
{
referenced = input.parse_node_name();
}
else
{
referenced = input.parse_to('}');
input.consume('}');
isPath = true;
}
if (referenced.empty())
{
input.parse_error("Expected node name");
@ -343,9 +356,9 @@ property::parse_cells(input_buffer &input, int cell_size)
}
void
property::parse_bytes(input_buffer &input)
property::parse_bytes(text_input_buffer &input)
{
assert(input[0] == '[');
assert(*input == '[');
++input;
property_value v;
input.next_token();
@ -370,13 +383,13 @@ property::parse_bytes(input_buffer &input)
}
void
property::parse_reference(input_buffer &input)
property::parse_reference(text_input_buffer &input)
{
assert(input[0] == '&');
assert(*input == '&');
++input;
input.next_token();
property_value v;
v.string_data = string::parse_node_name(input);
v.string_data = input.parse_node_name();
if (v.string_data.empty())
{
input.parse_error("Expected node name");
@ -400,7 +413,7 @@ property::property(input_buffer &structs, input_buffer &strings)
}
// Find the name
input_buffer name_buffer = strings.buffer_from_offset(name_offset);
if (name_buffer.empty())
if (name_buffer.finished())
{
fprintf(stderr, "Property name offset %" PRIu32
" is past the end of the strings table\n",
@ -408,7 +421,7 @@ property::property(input_buffer &structs, input_buffer &strings)
valid = false;
return;
}
key = string(name_buffer);
key = name_buffer.parse_to(0);
// If we're empty, do not push anything as value.
if (!length)
@ -429,7 +442,7 @@ property::property(input_buffer &structs, input_buffer &strings)
values.push_back(v);
}
void property::parse_define(input_buffer &input, define_map *defines)
void property::parse_define(text_input_buffer &input, define_map *defines)
{
input.consume('$');
if (!defines)
@ -438,7 +451,7 @@ void property::parse_define(input_buffer &input, define_map *defines)
valid = false;
return;
}
string name = string::parse_property_name(input);
string name = input.parse_property_name();
define_map::iterator found;
if ((name == string()) ||
((found = defines->find(name)) == defines->end()))
@ -450,15 +463,15 @@ void property::parse_define(input_buffer &input, define_map *defines)
values.push_back((*found).second->values[0]);
}
property::property(input_buffer &input,
string k,
string l,
property::property(text_input_buffer &input,
string &&k,
string_set &&l,
bool semicolonTerminated,
define_map *defines) : key(k), label(l), valid(true)
define_map *defines) : key(k), labels(l), valid(true)
{
do {
input.next_token();
switch (input[0])
switch (*input)
{
case '$':
{
@ -487,7 +500,7 @@ property::property(input_buffer &input,
}
if (!valid) return;
input.next_token();
if (input[0] != '<')
if (*input != '<')
{
input.parse_error("/bits/ directive is only valid on arrays");
valid = false;
@ -534,10 +547,14 @@ property::parse_dtb(input_buffer &structs, input_buffer &strings)
}
property_ptr
property::parse(input_buffer &input, string key, string label,
property::parse(text_input_buffer &input, string &&key, string_set &&label,
bool semicolonTerminated, define_map *defines)
{
property_ptr p(new property(input, key, label, semicolonTerminated, defines));
property_ptr p(new property(input,
std::move(key),
std::move(label),
semicolonTerminated,
defines));
if (!p->valid)
{
p = nullptr;
@ -596,14 +613,16 @@ property::write_dts(FILE *file, int indent)
{
putc('\t', file);
}
if (label != string())
#ifdef PRINT_LABELS
for (auto &l : labels)
{
label.print(file);
fputs(l.c_str(), file);
fputs(": ", file);
}
#endif
if (key != string())
{
key.print(file);
fputs(key.c_str(), file);
}
if (!values.empty())
{
@ -637,7 +656,7 @@ property::write_dts(FILE *file, int indent)
}
string
node::parse_name(input_buffer &input, bool &is_property, const char *error)
node::parse_name(text_input_buffer &input, bool &is_property, const char *error)
{
if (!valid)
{
@ -646,9 +665,9 @@ node::parse_name(input_buffer &input, bool &is_property, const char *error)
input.next_token();
if (is_property)
{
return string::parse_property_name(input);
return input.parse_property_name();
}
string n = string::parse_node_or_property_name(input, is_property);
string n = input.parse_node_or_property_name(is_property);
if (n.empty())
{
if (n.empty())
@ -672,25 +691,23 @@ node::visit(std::function<void(node&)> fn)
node::node(input_buffer &structs, input_buffer &strings) : valid(true)
{
const char *name_start = (const char*)structs;
int name_length = 0;
std::vector<char> bytes;
while (structs[0] != '\0' && structs[0] != '@')
{
name_length++;
bytes.push_back(structs[0]);
++structs;
}
name = string(name_start, name_length);
name = string(bytes.begin(), bytes.end());
bytes.clear();
if (structs[0] == '@')
{
++structs;
name_start = (const char*)structs;
name_length = 0;
while (structs[0] != '\0')
{
name_length++;
bytes.push_back(structs[0]);
++structs;
}
unit_address = string(name_start, name_length);
unit_address = string(bytes.begin(), bytes.end());
}
++structs;
uint32_t token;
@ -747,8 +764,12 @@ node::node(input_buffer &structs, input_buffer &strings) : valid(true)
return;
}
node::node(input_buffer &input, string n, string l, string a, define_map *defines) :
label(l), name(n), unit_address(a), valid(true)
node::node(text_input_buffer &input,
string &&n,
std::unordered_set<string> &&l,
string &&a,
define_map *defines)
: labels(l), name(n), unit_address(a), valid(true)
{
if (!input.consume('{'))
{
@ -760,15 +781,60 @@ node::node(input_buffer &input, string n, string l, string a, define_map *define
// flag set if we find any characters that are only in
// the property name character set, not the node
bool is_property = false;
string child_name, child_label, child_address;
string child_name, child_address;
std::unordered_set<string> child_labels;
auto parse_delete = [&](const char *expected, bool at)
{
if (child_name == string())
{
input.parse_error(expected);
valid = false;
return;
}
input.next_token();
if (at && input.consume('@'))
{
child_name += '@';
child_name += parse_name(input, is_property, "Expected unit address");
}
if (!input.consume(';'))
{
input.parse_error("Expected semicolon");
valid = false;
return;
}
input.next_token();
};
if (input.consume("/delete-node/"))
{
input.next_token();
child_name = input.parse_node_name();
parse_delete("Expected node name", true);
if (valid)
{
deleted_children.insert(child_name);
}
continue;
}
if (input.consume("/delete-property/"))
{
input.next_token();
child_name = input.parse_property_name();
parse_delete("Expected property name", false);
if (valid)
{
deleted_props.insert(child_name);
}
continue;
}
child_name = parse_name(input, is_property,
"Expected property or node name");
if (input.consume(':'))
while (input.consume(':'))
{
// Node labels can contain any characters? The
// spec doesn't say, so we guess so...
is_property = false;
child_label = child_name;
child_labels.insert(std::move(child_name));
child_name = parse_name(input, is_property, "Expected property or node name");
}
if (input.consume('@'))
@ -783,8 +849,8 @@ node::node(input_buffer &input, string n, string l, string a, define_map *define
// If we're parsing a property, then we must actually do that.
if (input.consume('='))
{
property_ptr p = property::parse(input, child_name,
child_label, true, defines);
property_ptr p = property::parse(input, std::move(child_name),
std::move(child_labels), true, defines);
if (p == 0)
{
valid = false;
@ -794,10 +860,10 @@ node::node(input_buffer &input, string n, string l, string a, define_map *define
props.push_back(p);
}
}
else if (!is_property && input[0] == ('{'))
else if (!is_property && *input == ('{'))
{
node_ptr child = node::parse(input, child_name,
child_label, child_address, defines);
node_ptr child = node::parse(input, std::move(child_name),
std::move(child_labels), std::move(child_address), defines);
if (child)
{
children.push_back(std::move(child));
@ -809,15 +875,16 @@ node::node(input_buffer &input, string n, string l, string a, define_map *define
}
else if (input.consume(';'))
{
props.push_back(property_ptr(new property(child_name, child_label)));
props.push_back(property_ptr(new property(std::move(child_name), std::move(child_labels))));
}
else
{
input.parse_error("Error parsing property.");
input.parse_error("Error parsing property. Expected property value");
valid = false;
}
input.next_token();
}
input.next_token();
input.consume(';');
}
@ -849,13 +916,17 @@ node::sort()
}
node_ptr
node::parse(input_buffer &input,
string name,
string label,
string address,
node::parse(text_input_buffer &input,
string &&name,
string_set &&label,
string &&address,
define_map *defines)
{
node_ptr n(new node(input, name, label, address, defines));
node_ptr n(new node(input,
std::move(name),
std::move(label),
std::move(address),
defines));
if (!n->valid)
{
n = 0;
@ -875,7 +946,7 @@ node::parse_dtb(input_buffer &structs, input_buffer &strings)
}
property_ptr
node::get_property(string key)
node::get_property(const string &key)
{
for (auto &i : props)
{
@ -890,9 +961,9 @@ node::get_property(string key)
void
node::merge_node(node_ptr other)
{
if (!other->label.empty())
for (auto &l : other->labels)
{
label = other->label;
labels.insert(l);
}
// Note: this is an O(n*m) operation. It might be sensible to
// optimise this if we find that there are nodes with very
@ -933,6 +1004,30 @@ node::merge_node(node_ptr other)
children.push_back(std::move(c));
}
}
children.erase(std::remove_if(children.begin(), children.end(),
[&](const node_ptr &p) {
string full_name = p->name;
if (p->unit_address != string())
{
full_name += '@';
full_name += p->unit_address;
}
if (other->deleted_children.count(full_name) > 0)
{
other->deleted_children.erase(full_name);
return true;
}
return false;
}), children.end());
props.erase(std::remove_if(props.begin(), props.end(),
[&](const property_ptr &p) {
if (other->deleted_props.count(p->get_key()) > 0)
{
other->deleted_props.erase(p->get_key());
return true;
}
return false;
}), props.end());
}
void
@ -940,11 +1035,11 @@ node::write(dtb::output_writer &writer, dtb::string_table &strings)
{
writer.write_token(dtb::FDT_BEGIN_NODE);
byte_buffer name_buffer;
name.push_to_buffer(name_buffer);
push_string(name_buffer, name);
if (unit_address != string())
{
name_buffer.push_back('@');
unit_address.push_to_buffer(name_buffer);
push_string(name_buffer, unit_address);
}
writer.write_comment(name);
writer.write_data(name_buffer);
@ -968,20 +1063,19 @@ node::write_dts(FILE *file, int indent)
putc('\t', file);
}
#ifdef PRINT_LABELS
if (label != string())
for (auto &label : labels)
{
label.print(file);
fputs(": ", file);
fprintf(file, "%s: ", label.c_str());
}
#endif
if (name != string())
{
name.print(file);
fputs(name.c_str(), file);
}
if (unit_address != string())
{
putc('@', file);
unit_address.print(file);
fputs(unit_address.c_str(), file);
}
fputs(" {\n\n", file);
for (auto p : properties())
@ -1002,26 +1096,27 @@ node::write_dts(FILE *file, int indent)
void
device_tree::collect_names_recursive(node_ptr &n, node_path &path)
{
string name = n->label;
path.push_back(std::make_pair(n->name, n->unit_address));
if (name != string())
for (const string &name : n->labels)
{
if (node_names.find(name) == node_names.end())
if (name != string())
{
node_names.insert(std::make_pair(name, n.get()));
node_paths.insert(std::make_pair(name, path));
}
else
{
node_names[name] = (node*)-1;
auto i = node_paths.find(name);
if (i != node_paths.end())
auto iter = node_names.find(name);
if (iter == node_names.end())
{
node_paths.erase(name);
node_names.insert(std::make_pair(name, n.get()));
node_paths.insert(std::make_pair(name, path));
}
else
{
node_names.erase(iter);
auto i = node_paths.find(name);
if (i != node_paths.end())
{
node_paths.erase(name);
}
fprintf(stderr, "Label not unique: %s. References to this label will not be resolved.\n", name.c_str());
}
fprintf(stderr, "Label not unique: ");
name.dump();
fprintf(stderr, ". References to this label will not be resolved.");
}
}
for (auto &c : n->child_nodes())
@ -1044,14 +1139,12 @@ device_tree::collect_names_recursive(node_ptr &n, node_path &path)
cross_references.push_back(&v);
}
}
if (p->get_key() == string("phandle") ||
p->get_key() == string("linux,phandle"))
if ((p->get_key() == "phandle") ||
(p->get_key() == "linux,phandle"))
{
if (p->begin()->byte_data.size() != 4)
{
fprintf(stderr, "Invalid phandle value for node ");
n->name.dump();
fprintf(stderr, ". Should be a 4-byte value.\n");
fprintf(stderr, "Invalid phandle value for node %s. Should be a 4-byte value.\n", n->name.c_str());
valid = false;
}
else
@ -1080,16 +1173,21 @@ device_tree::resolve_cross_references()
for (auto *pv : cross_references)
{
node_path path = node_paths[pv->string_data];
// Skip the first name in the path. It's always "", and implicitly /
for (auto p=path.begin()+1, pe=path.end() ; p!=pe ; ++p)
auto p = path.begin();
auto pe = path.end();
if (p != pe)
{
pv->byte_data.push_back('/');
p->first.push_to_buffer(pv->byte_data);
if (!(p->second.empty()))
// Skip the first name in the path. It's always "", and implicitly /
for (++p ; p!=pe ; ++p)
{
pv->byte_data.push_back('@');
p->second.push_to_buffer(pv->byte_data);
pv->byte_data.push_back(0);
pv->byte_data.push_back('/');
push_string(pv->byte_data, p->first);
if (!(p->second.empty()))
{
pv->byte_data.push_back('@');
push_string(pv->byte_data, p->second);
pv->byte_data.push_back(0);
}
}
}
}
@ -1117,12 +1215,72 @@ device_tree::resolve_cross_references()
for (auto &i : sorted_phandles)
{
string target_name = i->string_data;
node *target = node_names[target_name];
if (target == 0)
node *target = nullptr;
string possible;
// If the node name is a path, then look it up by following the path,
// otherwise jump directly to the named node.
if (target_name[0] == '/')
{
fprintf(stderr, "Failed to find node with label: ");
target_name.dump();
fprintf(stderr, "\n");
std::string path;
target = root.get();
std::istringstream ss(target_name);
string path_element;
// Read the leading /
std::getline(ss, path_element, '/');
// Iterate over path elements
while (!ss.eof())
{
path += '/';
std::getline(ss, path_element, '/');
std::istringstream nss(path_element);
string node_name, node_address;
std::getline(nss, node_name, '@');
std::getline(nss, node_address, '@');
node *next = nullptr;
for (auto &c : target->child_nodes())
{
if (c->name == node_name)
{
if (c->unit_address == node_address)
{
next = c.get();
break;
}
else
{
possible = path + c->name;
if (c->unit_address != string())
{
possible += '@';
possible += c->unit_address;
}
}
}
}
path += node_name;
if (node_address != string())
{
path += '@';
path += node_address;
}
target = next;
if (target == nullptr)
{
break;
}
}
}
else
{
target = node_names[target_name];
}
if (target == nullptr)
{
fprintf(stderr, "Failed to find node with label: %s\n", target_name.c_str());
if (possible != string())
{
fprintf(stderr, "Possible intended match: %s\n", possible.c_str());
}
valid = 0;
return;
}
@ -1153,13 +1311,13 @@ device_tree::resolve_cross_references()
push_big_endian(v.byte_data, phandle++);
if (phandle_node_name == BOTH || phandle_node_name == LINUX)
{
p.reset(new property(string("linux,phandle")));
p.reset(new property("linux,phandle"));
p->add_value(v);
target->add_property(p);
}
if (phandle_node_name == BOTH || phandle_node_name == EPAPR)
{
p.reset(new property(string("phandle")));
p.reset(new property("phandle"));
p->add_value(v);
target->add_property(p);
}
@ -1169,87 +1327,10 @@ device_tree::resolve_cross_references()
}
}
bool
device_tree::parse_include(input_buffer &input,
const std::string &dir,
std::vector<node_ptr> &roots,
FILE *depfile,
bool &read_header)
{
if (!input.consume("/include/"))
{
return false;
}
bool reallyInclude = true;
if (input.consume("if "))
{
input.next_token();
string name = string::parse_property_name(input);
// XXX: Error handling
if (defines.find(name) == defines.end())
{
reallyInclude = false;
}
input.consume('/');
}
input.next_token();
if (!input.consume('"'))
{
input.parse_error("Expected quoted filename");
valid = false;
return false;
}
int length = 0;
while (input[length] != '"') length++;
std::string file((const char*)input, length);
std::string include_file = dir + '/' + file;
input.consume(file.c_str());
if (!reallyInclude)
{
input.consume('"');
input.next_token();
return true;
}
input_buffer *include_buffer = buffer_for_file(include_file.c_str(), false);
if (include_buffer == 0)
{
for (auto i : include_paths)
{
include_file = i + '/' + file;
include_buffer = buffer_for_file(include_file.c_str());
if (include_buffer != 0)
{
break;
}
}
}
if (depfile != 0)
{
putc(' ', depfile);
fputs(include_file.c_str(), depfile);
}
if (include_buffer == 0)
{
input.parse_error("Unable to locate input file");
input.consume('"');
input.next_token();
valid = false;
return true;
}
input.consume('"');
input.next_token();
parse_file(*include_buffer, dir, roots, depfile, read_header);
return true;
}
void
device_tree::parse_file(input_buffer &input,
const std::string &dir,
device_tree::parse_file(text_input_buffer &input,
std::vector<node_ptr> &roots,
FILE *depfile,
bool &read_header)
{
input.next_token();
@ -1264,9 +1345,8 @@ device_tree::parse_file(input_buffer &input,
{
input.parse_error("Expected /dts-v1/; version string");
}
while(parse_include(input, dir, roots, depfile, read_header)) {}
// Read any memory reservations
while(input.consume("/memreserve/"))
while (input.consume("/memreserve/"))
{
unsigned long long start, len;
input.next_token();
@ -1280,23 +1360,22 @@ device_tree::parse_file(input_buffer &input,
input.next_token();
input.consume(';');
reservations.push_back(reservation(start, len));
input.next_token();
}
input.next_token();
while(parse_include(input, dir, roots, depfile, read_header)) {}
while (valid && !input.finished())
{
node_ptr n;
if (input.consume('/'))
{
input.next_token();
n = node::parse(input, string(), string(), string(), &defines);
n = node::parse(input, string(), string_set(), string(), &defines);
}
else if (input.consume('&'))
{
input.next_token();
string name = string::parse_node_name(input);
string name = input.parse_node_name();
input.next_token();
n = node::parse(input, name, string(), string(), &defines);
n = node::parse(input, std::move(name), string_set(), string(), &defines);
}
else
{
@ -1311,52 +1390,9 @@ device_tree::parse_file(input_buffer &input,
valid = false;
}
input.next_token();
while(parse_include(input, dir, roots, depfile, read_header)) {}
}
}
input_buffer*
device_tree::buffer_for_file(const char *path, bool warn)
{
if (string(path) == string("-"))
{
input_buffer *b = new stream_input_buffer();
if (b)
{
std::unique_ptr<input_buffer> ptr(b);
buffers.push_back(std::move(ptr));
}
return b;
}
int source = open(path, O_RDONLY);
if (source == -1)
{
if (warn)
{
fprintf(stderr, "Unable to open file '%s'. %s\n", path, strerror(errno));
}
return 0;
}
struct stat st;
if (fstat(source, &st) == 0 && S_ISDIR(st.st_mode))
{
fprintf(stderr, "File %s is a directory\n", path);
close(source);
return 0;
}
input_buffer *b = new mmap_input_buffer(source);
// Keep the buffer that owns the memory around for the lifetime
// of this FDT. Ones simply referring to it may have shorter
// lifetimes.
if (b)
{
std::unique_ptr<input_buffer> ptr(b);
buffers.push_back(std::move(ptr));
}
close(source);
return b;
}
template<class writer> void
device_tree::write(int fd)
{
@ -1475,9 +1511,9 @@ device_tree::write_dts(int fd)
}
void
device_tree::parse_dtb(const char *fn, FILE *)
device_tree::parse_dtb(const string &fn, FILE *)
{
input_buffer *in = buffer_for_file(fn);
auto in = input_buffer::buffer_for_file(fn);
if (in == 0)
{
valid = false;
@ -1532,19 +1568,27 @@ device_tree::parse_dtb(const char *fn, FILE *)
}
void
device_tree::parse_dts(const char *fn, FILE *depfile)
device_tree::parse_dts(const string &fn, FILE *depfile)
{
input_buffer *in = buffer_for_file(fn);
std::string dir(dirname((char*)fn));
if (in == 0)
auto in = input_buffer::buffer_for_file(fn);
if (!in)
{
valid = false;
return;
}
std::vector<node_ptr> roots;
input_buffer &input = *in;
std::unordered_set<string> defnames;
for (auto &i : defines)
{
defnames.insert(i.first);
}
text_input_buffer input(std::move(in),
std::move(defnames),
std::vector<string>(include_paths),
dirname(fn),
depfile);
bool read_header = false;
parse_file(input, dir, roots, depfile, read_header);
parse_file(input, roots, read_header);
switch (roots.size())
{
case 0:
@ -1575,11 +1619,12 @@ device_tree::parse_dts(const char *fn, FILE *depfile)
}
if (existing == node_names.end())
{
fprintf(stderr, "Unable to merge node: ");
name.dump();
fprintf(stderr, "\n");
fprintf(stderr, "Unable to merge node: %s\n", name.c_str());
}
else
{
existing->second->merge_node(std::move(node));
}
existing->second->merge_node(std::move(node));
}
}
}
@ -1602,9 +1647,15 @@ bool device_tree::parse_define(const char *def)
return false;
}
string name(def, val-def);
string name_copy = name;
val++;
input_buffer in = input_buffer(val, strlen(val));
property_ptr p = property::parse(in, name, string(), false);
std::unique_ptr<input_buffer> raw(new input_buffer(val, strlen(val)));
text_input_buffer in(std::move(raw),
std::unordered_set<string>(),
std::vector<string>(),
std::string(),
nullptr);
property_ptr p = property::parse(in, std::move(name_copy), string_set(), false);
if (p)
defines[name] = p;
return (bool)p;

142
usr.bin/dtc/fdt.hh
View File

@ -39,7 +39,7 @@
#include <functional>
#include "util.hh"
#include "string.hh"
#include "input_buffer.hh"
namespace dtc
{
@ -65,7 +65,11 @@ typedef std::unique_ptr<node> node_ptr;
/**
* Map from macros to property pointers.
*/
typedef std::unordered_map<string, property_ptr> define_map;
typedef std::unordered_map<std::string, property_ptr> define_map;
/**
* Set of strings used for label names.
*/
typedef std::unordered_set<std::string> string_set;
/**
* Properties may contain a number of different value, each with a different
* label. This class encapsulates a single value.
@ -75,12 +79,12 @@ struct property_value
/**
* The label for this data. This is usually empty.
*/
string label;
std::string label;
/**
* If this value is a string, or something resolved from a string (a
* reference) then this contains the source string.
*/
string string_data;
std::string string_data;
/**
* The data that should be written to the final output.
*/
@ -186,7 +190,7 @@ struct property_value
/**
* Default constructor, specifying the label of the value.
*/
property_value(string l=string()) : label(l), type(UNKNOWN) {}
property_value(std::string l=std::string()) : label(l), type(UNKNOWN) {}
/**
* Writes the data for this value into an output buffer.
*/
@ -250,11 +254,11 @@ class property
/**
* The name of this property.
*/
string key;
std::string key;
/**
* An optional label.
* Zero or more labels.
*/
string label;
string_set labels;
/**
* The values in this property.
*/
@ -267,15 +271,15 @@ class property
/**
* Parses a string property value, i.e. a value enclosed in double quotes.
*/
void parse_string(input_buffer &input);
void parse_string(text_input_buffer &input);
/**
* Parses one or more 32-bit values enclosed in angle brackets.
*/
void parse_cells(input_buffer &input, int cell_size);
void parse_cells(text_input_buffer &input, int cell_size);
/**
* Parses an array of bytes, contained within square brackets.
*/
void parse_bytes(input_buffer &input);
void parse_bytes(text_input_buffer &input);
/**
* Parses a reference. This is a node label preceded by an ampersand
* symbol, which should expand to the full path to that node.
@ -284,11 +288,11 @@ class property
* a node name, however dtc assumes that it is a label, and so we
* follow their interpretation for compatibility.
*/
void parse_reference(input_buffer &input);
void parse_reference(text_input_buffer &input);
/**
* Parse a predefined macro definition for a property.
*/
void parse_define(input_buffer &input, define_map *defines);
void parse_define(text_input_buffer &input, define_map *defines);
/**
* Constructs a new property from two input buffers, pointing to the
* struct and strings tables in the device tree blob, respectively.
@ -299,21 +303,21 @@ class property
/**
* Parses a new property from the input buffer.
*/
property(input_buffer &input,
string k,
string l,
property(text_input_buffer &input,
std::string &&k,
string_set &&l,
bool terminated,
define_map *defines);
public:
/**
* Creates an empty property.
*/
property(string k, string l=string()) : key(k), label(l), valid(true)
{}
property(std::string &&k, string_set &&l=string_set())
: key(k), labels(l), valid(true) {}
/**
* Copy constructor.
*/
property(property &p) : key(p.key), label(p.label), values(p.values),
property(property &p) : key(p.key), labels(p.labels), values(p.values),
valid(p.valid) {}
/**
* Factory method for constructing a new property. Attempts to parse a
@ -321,15 +325,15 @@ class property
* error, this will return 0.
*/
static property_ptr parse_dtb(input_buffer &structs,
input_buffer &strings);
input_buffer &strings);
/**
* Factory method for constructing a new property. Attempts to parse a
* property from the input, and returns it on success. On any parse
* error, this will return 0.
*/
static property_ptr parse(input_buffer &input,
string key,
string label=string(),
static property_ptr parse(text_input_buffer &input,
std::string &&key,
string_set &&labels=string_set(),
bool semicolonTerminated=true,
define_map *defines=0);
/**
@ -360,7 +364,7 @@ class property
/**
* Returns the key for this property.
*/
inline string get_key()
inline std::string get_key()
{
return key;
}
@ -386,19 +390,19 @@ class node
{
public:
/**
* The label for this node, if any. Node labels are used as the
* The labels for this node, if any. Node labels are used as the
* targets for cross references.
*/
string label;
std::unordered_set<std::string> labels;
/**
* The name of the node.
*/
string name;
std::string name;
/**
* The unit address of the node, which is optionally written after the
* name followed by an at symbol.
*/
string unit_address;
std::string unit_address;
/**
* The type for the property vector.
*/
@ -438,6 +442,14 @@ class node
* The children of this node.
*/
std::vector<node_ptr> children;
/**
* Children that should be deleted from this node when merging.
*/
std::unordered_set<std::string> deleted_children;
/**
* Properties that should be deleted from this node when merging.
*/
std::unordered_set<std::string> deleted_props;
/**
* A flag indicating whether this node is valid. This is set to false
* if an error occurs during parsing.
@ -447,9 +459,9 @@ class node
* Parses a name inside a node, writing the string passed as the last
* argument as an error if it fails.
*/
string parse_name(input_buffer &input,
bool &is_property,
const char *error);
std::string parse_name(text_input_buffer &input,
bool &is_property,
const char *error);
/**
* Constructs a new node from two input buffers, pointing to the struct
* and strings tables in the device tree blob, respectively.
@ -461,7 +473,11 @@ class node
* node. The name, and optionally label and unit address, should have
* already been parsed.
*/
node(input_buffer &input, string n, string l, string a, define_map*);
node(text_input_buffer &input,
std::string &&n,
std::unordered_set<std::string> &&l,
std::string &&a,
define_map*);
/**
* Comparison function for properties, used when sorting the properties
* vector. Orders the properties based on their names.
@ -498,10 +514,32 @@ class node
{
return children.end();
}
/**
* Returns a range suitable for use in a range-based for loop describing
* the children of this node.
*/
inline child_range child_nodes()
{
return child_range(*this);
}
/**
* Accessor for the deleted children.
*/
inline const std::unordered_set<std::string> &deleted_child_nodes()
{
return deleted_children;
}
/**
* Accessor for the deleted properties
*/
inline const std::unordered_set<std::string> &deleted_properties()
{
return deleted_props;
}
/**
* Returns a range suitable for use in a range-based for loop describing
* the properties of this node.
*/
inline property_range properties()
{
return property_range(*this);
@ -527,10 +565,10 @@ class node
* cursor on the open brace of the property, after the name and so on
* have been parsed.
*/
static node_ptr parse(input_buffer &input,
string name,
string label=string(),
string address=string(),
static node_ptr parse(text_input_buffer &input,
std::string &&name,
std::unordered_set<std::string> &&label=std::unordered_set<std::string>(),
std::string &&address=std::string(),
define_map *defines=0);
/**
* Factory method for constructing a new node. Attempts to parse a
@ -544,7 +582,7 @@ class node
* Returns a property corresponding to the specified key, or 0 if this
* node does not contain a property of that name.
*/
property_ptr get_property(string key);
property_ptr get_property(const std::string &key);
/**
* Adds a new property to this node.
*/
@ -588,7 +626,7 @@ class device_tree
* Type used for node paths. A node path is sequence of names and unit
* addresses.
*/
typedef std::vector<std::pair<string,string> > node_path;
typedef std::vector<std::pair<std::string,std::string> > node_path;
/**
* Name that we should use for phandle nodes.
*/
@ -630,13 +668,13 @@ class device_tree
* Mapping from names to nodes. Only unambiguous names are recorded,
* duplicate names are stored as (node*)-1.
*/
std::unordered_map<string, node*> node_names;
std::unordered_map<std::string, node*> node_names;
/**
* A map from labels to node paths. When resolving cross references,
* we look up referenced nodes in this and replace the cross reference
* with the full path to its target.
*/
std::unordered_map<string, node_path> node_paths;
std::unordered_map<std::string, node_path> node_paths;
/**
* A collection of property values that are references to other nodes.
* These should be expanded to the full path of their targets.
@ -651,7 +689,7 @@ class device_tree
/**
* The names of nodes that target phandles.
*/
std::unordered_set<string> phandle_targets;
std::unordered_set<std::string> phandle_targets;
/**
* A collection of input buffers that we are using. These input
* buffers are the ones that own their memory, and so we must preserve
@ -717,31 +755,15 @@ class device_tree
* phandle value.
*/
void resolve_cross_references();
/**
* Parse a top-level include directive.
*/
bool parse_include(input_buffer &input,
const std::string &dir,
std::vector<node_ptr> &roots,
FILE *depfile,
bool &read_header);
/**
* Parses a dts file in the given buffer and adds the roots to the parsed
* set. The `read_header` argument indicates whether the header has
* already been read. Some dts files place the header in an include,
* rather than in the top-level file.
*/
void parse_file(input_buffer &input,
const std::string &dir,
void parse_file(text_input_buffer &input,
std::vector<node_ptr> &roots,
FILE *depfile,
bool &read_header);
/**
* Allocates a new mmap()'d input buffer for use in parsing. This
* object then keeps a reference to it, ensuring that it is not
* deallocated until the device tree is destroyed.
*/
input_buffer *buffer_for_file(const char *path, bool warn=true);
/**
* Template function that writes a dtb blob using the specified writer.
* The writer defines the output format (assembly, blob).
@ -779,12 +801,12 @@ class device_tree
* Constructs a device tree from the specified file name, referring to
* a file that contains a device tree blob.
*/
void parse_dtb(const char *fn, FILE *depfile);
void parse_dtb(const std::string &fn, FILE *depfile);
/**
* Constructs a device tree from the specified file name, referring to
* a file that contains device tree source.
*/
void parse_dts(const char *fn, FILE *depfile);
void parse_dts(const std::string &fn, FILE *depfile);
/**
* Returns whether this tree is valid.
*/

630
usr.bin/dtc/input_buffer.cc
View File

@ -46,37 +46,215 @@
#include <sys/stat.h>
#include <sys/mman.h>
#include <assert.h>
#include <fcntl.h>
#include <unistd.h>
#ifndef MAP_PREFAULT_READ
#define MAP_PREFAULT_READ 0
#endif
using std::string;
namespace
{
/**
* Subclass of input_buffer that mmap()s a file and owns the resulting memory.
* When this object is destroyed, the memory is unmapped.
*/
struct mmap_input_buffer : public dtc::input_buffer
{
string fn;
const string &filename() const override
{
return fn;
}
/**
* Constructs a new buffer from the file passed in as a file
* descriptor.
*/
mmap_input_buffer(int fd, string &&filename);
/**
* Unmaps the buffer, if one exists.
*/
virtual ~mmap_input_buffer();
};
/**
* Input buffer read from standard input. This is used for reading device tree
* blobs and source from standard input. It reads the entire input into
* malloc'd memory, so will be very slow for large inputs. DTS and DTB files
* are very rarely more than 10KB though, so this is probably not a problem.
*/
struct stream_input_buffer : public dtc::input_buffer
{
const string &filename() const override
{
static string n = "<standard input>";
return n;
}
/**
* The buffer that will store the data read from the standard input.
*/
std::vector<char> b;
/**
* Constructs a new buffer from the standard input.
*/
stream_input_buffer();
};
mmap_input_buffer::mmap_input_buffer(int fd, std::string &&filename)
: input_buffer(0, 0), fn(filename)
{
struct stat sb;
if (fstat(fd, &sb))
{
perror("Failed to stat file");
}
size = sb.st_size;
buffer = (const char*)mmap(0, size, PROT_READ, MAP_PRIVATE |
MAP_PREFAULT_READ, fd, 0);
if (buffer == MAP_FAILED)
{
perror("Failed to mmap file");
exit(EXIT_FAILURE);
}
}
mmap_input_buffer::~mmap_input_buffer()
{
if (buffer != 0)
{
munmap((void*)buffer, size);
}
}
stream_input_buffer::stream_input_buffer() : input_buffer(0, 0)
{
int c;
while ((c = fgetc(stdin)) != EOF)
{
b.push_back(c);
}
buffer = b.data();
size = b.size();
}
} // Anonymous namespace
namespace dtc
{
void
input_buffer::skip_spaces()
input_buffer::skip_to(char c)
{
if (cursor >= size) { return; }
if (cursor < 0) { return; }
char c = buffer[cursor];
while ((cursor < size) && (buffer[cursor] != c))
{
cursor++;
}
}
void
text_input_buffer::skip_to(char c)
{
while (!finished() && (*(*this) != c))
{
++(*this);
}
}
void
text_input_buffer::skip_spaces()
{
if (finished()) { return; }
char c = *(*this);
bool last_nl = false;
while ((c == ' ') || (c == '\t') || (c == '\n') || (c == '\f')
|| (c == '\v') || (c == '\r'))
{
cursor++;
if (cursor > size)
last_nl = ((c == '\n') || (c == '\r'));
++(*this);
if (finished())
{
c = '\0';
}
else
{
c = buffer[cursor];
c = *(*this);
}
}
// Skip C preprocessor leftovers
if ((c == '#') && ((cursor == 0) || last_nl))
{
skip_to('\n');
skip_spaces();
}
if (consume("/include/"))
{
handle_include();
skip_spaces();
}
}
void
text_input_buffer::handle_include()
{
bool reallyInclude = true;
if (consume("if "))
{
next_token();
string name = parse_property_name();
if (defines.count(name) > 0)
{
reallyInclude = true;
}
consume('/');
}
next_token();
if (!consume('"'))
{
parse_error("Expected quoted filename");
return;
}
string file = parse_to('"');
consume('"');
if (!reallyInclude)
{
return;
}
string include_file = dir + '/' + file;
auto include_buffer = input_buffer::buffer_for_file(include_file, false);
if (include_buffer == 0)
{
for (auto i : include_paths)
{
include_file = i + '/' + file;
include_buffer = input_buffer::buffer_for_file(include_file, false);
if (include_buffer != 0)
{
break;
}
}
}
if (depfile)
{
putc(' ', depfile);
fputs(include_file.c_str(), depfile);
}
if (!include_buffer)
{
parse_error("Unable to locate input file");
return;
}
input_stack.push(std::move(include_buffer));
}
input_buffer
input_buffer::buffer_from_offset(int offset, int s)
{
if (offset < 0)
{
return input_buffer();
}
if (s == 0)
{
s = size - offset;
@ -104,7 +282,7 @@ input_buffer::consume(const char *str)
{
for (int i=0 ; i<len ; ++i)
{
if (str[i] != buffer[cursor + i])
if (str[i] != (*this)[i])
{
return false;
}
@ -124,7 +302,7 @@ input_buffer::consume_integer(unsigned long long &outInt)
{
return false;
}
char *end=0;
char *end= const_cast<char*>(&buffer[size]);
outInt = strtoull(&buffer[cursor], &end, 0);
if (end == &buffer[cursor])
{
@ -146,15 +324,27 @@ typedef unsigned long long valty;
*/
struct expression
{
typedef text_input_buffer::source_location source_location;
/**
* The type that is returned when computing the result. The boolean value
* indicates whether this is a valid expression.
*
* FIXME: Once we can use C++17, this should be `std::optional`.
*/
typedef std::pair<valty, bool> result;
/**
* Evaluate this node, taking into account operator precedence.
*/
virtual valty operator()() = 0;
virtual result operator()() = 0;
/**
* Returns the precedence of this node. Lower values indicate higher
* precedence.
*/
virtual int precedence() = 0;
/**
* Constructs an expression, storing the location where it was created.
*/
expression(source_location l) : loc(l) {}
virtual ~expression() {}
#ifndef NDEBUG
/**
@ -163,7 +353,8 @@ struct expression
*/
void dump(bool nl=false)
{
if (this == nullptr)
void *ptr = this;
if (ptr == nullptr)
{
std::cerr << "{nullptr}\n";
return;
@ -180,6 +371,8 @@ struct expression
*/
virtual void dump_impl() = 0;
#endif
protected:
source_location loc;
};
/**
@ -194,9 +387,9 @@ class terminal_expr : public expression
/**
* Evaluate. Trivially returns the value that this class wraps.
*/
valty operator()() override
result operator()() override
{
return val;
return {val, true};
}
int precedence() override
{
@ -206,7 +399,7 @@ class terminal_expr : public expression
/**
* Constructor.
*/
terminal_expr(valty v) : val(v) {}
terminal_expr(source_location l, valty v) : expression(l), val(v) {}
#ifndef NDEBUG
void dump_impl() override { std::cerr << val; }
#endif
@ -224,7 +417,8 @@ struct paren_expression : public expression
/**
* Constructor. Takes the child expression as the only argument.
*/
paren_expression(expression_ptr p) : subexpr(std::move(p)) {}
paren_expression(source_location l, expression_ptr p) : expression(l),
subexpr(std::move(p)) {}
int precedence() override
{
return 0;
@ -232,7 +426,7 @@ struct paren_expression : public expression
/**
* Evaluate - just forwards to the underlying expression.
*/
valty operator()() override
result operator()() override
{
return (*subexpr)();
}
@ -260,10 +454,15 @@ class unary_operator : public expression
* The subexpression for this unary operator.
*/
expression_ptr subexpr;
valty operator()() override
result operator()() override
{
Op op;
return op((*subexpr)());
result s = (*subexpr)();
if (!s.second)
{
return s;
}
return {op(s.first), true};
}
/**
* All unary operators have the same precedence. They are all evaluated
@ -274,7 +473,8 @@ class unary_operator : public expression
return 3;
}
public:
unary_operator(expression_ptr p) : subexpr(std::move(p)) {}
unary_operator(source_location l, expression_ptr p) :
expression(l), subexpr(std::move(p)) {}
#ifndef NDEBUG
void dump_impl() override
{
@ -290,6 +490,7 @@ class unary_operator : public expression
*/
struct binary_operator_base : public expression
{
using expression::expression;
/**
* The left side of the expression.
*/
@ -323,10 +524,16 @@ struct binary_operator_base : public expression
template<int Precedence, class Op>
struct binary_operator : public binary_operator_base
{
valty operator()() override
result operator()() override
{
Op op;
return op((*lhs)(), (*rhs)());
result l = (*lhs)();
result r = (*rhs)();
if (!(l.second && r.second))
{
return {0, false};
}
return {op(l.first, r.first), true};
}
int precedence() override
{
@ -337,10 +544,11 @@ struct binary_operator : public binary_operator_base
* Constructor. Takes the name of the operator as an argument, for
* debugging. Only stores it in debug mode.
*/
binary_operator(const char *) {}
binary_operator(source_location l, const char *) : expression(l) {}
#else
const char *opName;
binary_operator(const char *o) : opName(o) {}
binary_operator(source_location l, const char *o) :
binary_operator_base(l), opName(o) {}
void dump_impl() override
{
lhs->dump();
@ -368,9 +576,16 @@ class ternary_conditional_operator : public expression
* The expression that this evaluates to if the condition is false.
*/
expression_ptr rhs;
valty operator()() override
result operator()() override
{
return (*cond)() ? (*lhs)() : (*rhs)();
result c = (*cond)();
result l = (*lhs)();
result r = (*rhs)();
if (!(l.second && r.second && c.second))
{
return {0, false};
}
return c.first ? l : r;
}
int precedence() override
{
@ -390,10 +605,12 @@ class ternary_conditional_operator : public expression
}
#endif
public:
ternary_conditional_operator(expression_ptr c,
ternary_conditional_operator(source_location sl,
expression_ptr c,
expression_ptr l,
expression_ptr r) :
cond(std::move(c)), lhs(std::move(l)), rhs(std::move(r)) {}
expression(sl), cond(std::move(c)), lhs(std::move(l)),
rhs(std::move(r)) {}
};
template<typename T>
@ -430,36 +647,53 @@ struct bit_not
}
};
template<typename T>
struct divmod : public binary_operator<5, T>
{
using binary_operator<5, T>::binary_operator;
using binary_operator_base::result;
result operator()() override
{
result r = (*binary_operator_base::rhs)();
if (r.second && (r.first == 0))
{
expression::loc.report_error("Division by zero");
return {0, false};
}
return binary_operator<5, T>::operator()();
}
};
} // anonymous namespace
expression_ptr input_buffer::parse_binary_expression(expression_ptr lhs)
expression_ptr text_input_buffer::parse_binary_expression(expression_ptr lhs)
{
next_token();
binary_operator_base *expr = nullptr;
char op = ((*this)[0]);
char op = *(*this);
source_location l = location();
switch (op)
{
default:
return lhs;
case '+':
expr = new binary_operator<6, std::plus<valty>>("+");
expr = new binary_operator<6, std::plus<valty>>(l, "+");
break;
case '-':
expr = new binary_operator<6, std::minus<valty>>("-");
expr = new binary_operator<6, std::minus<valty>>(l, "-");
break;
case '%':
expr = new binary_operator<5, std::modulus<valty>>("%");
expr = new divmod<std::modulus<valty>>(l, "/");
break;
case '*':
expr = new binary_operator<5, std::multiplies<valty>>("*");
expr = new binary_operator<5, std::multiplies<valty>>(l, "*");
break;
case '/':
expr = new binary_operator<5, std::divides<valty>>("/");
expr = new divmod<std::divides<valty>>(l, "/");
break;
case '<':
cursor++;
switch ((*this)[0])
switch (peek())
{
default:
parse_error("Invalid operator");
@ -467,20 +701,20 @@ expression_ptr input_buffer::parse_binary_expression(expression_ptr lhs)
case ' ':
case '(':
case '0'...'9':
cursor--;
expr = new binary_operator<8, std::less<valty>>("<");
expr = new binary_operator<8, std::less<valty>>(l, "<");
break;
case '=':
expr = new binary_operator<8, std::less_equal<valty>>("<=");
++(*this);
expr = new binary_operator<8, std::less_equal<valty>>(l, "<=");
break;
case '<':
expr = new binary_operator<7, lshift<valty>>("<<");
++(*this);
expr = new binary_operator<7, lshift<valty>>(l, "<<");
break;
}
break;
case '>':
cursor++;
switch ((*this)[0])
switch (peek())
{
default:
parse_error("Invalid operator");
@ -488,54 +722,54 @@ expression_ptr input_buffer::parse_binary_expression(expression_ptr lhs)
case '(':
case ' ':
case '0'...'9':
cursor--;
expr = new binary_operator<8, std::greater<valty>>(">");
expr = new binary_operator<8, std::greater<valty>>(l, ">");
break;
case '=':
expr = new binary_operator<8, std::greater_equal<valty>>(">=");
++(*this);
expr = new binary_operator<8, std::greater_equal<valty>>(l, ">=");
break;
case '>':
expr = new binary_operator<7, rshift<valty>>(">>");
++(*this);
expr = new binary_operator<7, rshift<valty>>(l, ">>");
break;
return lhs;
}
break;
case '=':
if ((*this)[1] != '=')
if (peek() != '=')
{
parse_error("Invalid operator");
return nullptr;
}
consume('=');
expr = new binary_operator<9, std::equal_to<valty>>("==");
expr = new binary_operator<9, std::equal_to<valty>>(l, "==");
break;
case '!':
if ((*this)[1] != '=')
if (peek() != '=')
{
parse_error("Invalid operator");
return nullptr;
}
cursor++;
expr = new binary_operator<9, std::not_equal_to<valty>>("!=");
expr = new binary_operator<9, std::not_equal_to<valty>>(l, "!=");
break;
case '&':
if ((*this)[1] == '&')
if (peek() == '&')
{
expr = new binary_operator<13, std::logical_and<valty>>("&&");
expr = new binary_operator<13, std::logical_and<valty>>(l, "&&");
}
else
{
expr = new binary_operator<10, std::bit_and<valty>>("&");
expr = new binary_operator<10, std::bit_and<valty>>(l, "&");
}
break;
case '|':
if ((*this)[1] == '|')
if (peek() == '|')
{
expr = new binary_operator<12, std::logical_or<valty>>("||");
expr = new binary_operator<12, std::logical_or<valty>>(l, "||");
}
else
{
expr = new binary_operator<14, std::bit_or<valty>>("|");
expr = new binary_operator<14, std::bit_or<valty>>(l, "|");
}
break;
case '?':
@ -554,11 +788,11 @@ expression_ptr input_buffer::parse_binary_expression(expression_ptr lhs)
parse_error("Expected false condition for ternary operator");
return nullptr;
}
return expression_ptr(new ternary_conditional_operator(std::move(lhs),
return expression_ptr(new ternary_conditional_operator(l, std::move(lhs),
std::move(true_case), std::move(false_case)));
}
}
cursor++;
++(*this);
next_token();
expression_ptr e(expr);
expression_ptr rhs(parse_expression());
@ -584,19 +818,20 @@ expression_ptr input_buffer::parse_binary_expression(expression_ptr lhs)
return e;
}
expression_ptr input_buffer::parse_expression(bool stopAtParen)
expression_ptr text_input_buffer::parse_expression(bool stopAtParen)
{
next_token();
unsigned long long leftVal;
expression_ptr lhs;
switch ((*this)[0])
source_location l = location();
switch (*(*this))
{
case '0'...'9':
if (!consume_integer(leftVal))
{
return nullptr;
}
lhs.reset(new terminal_expr(leftVal));
lhs.reset(new terminal_expr(l, leftVal));
break;
case '(':
{
@ -606,7 +841,7 @@ expression_ptr input_buffer::parse_expression(bool stopAtParen)
{
return nullptr;
}
lhs.reset(new paren_expression(std::move(subexpr)));
lhs.reset(new paren_expression(l, std::move(subexpr)));
if (!consume(')'))
{
return nullptr;
@ -625,7 +860,7 @@ expression_ptr input_buffer::parse_expression(bool stopAtParen)
{
return nullptr;
}
lhs.reset(new unary_operator<'+', unary_plus<valty>>(std::move(subexpr)));
lhs.reset(new unary_operator<'+', unary_plus<valty>>(l, std::move(subexpr)));
break;
}
case '-':
@ -636,7 +871,7 @@ expression_ptr input_buffer::parse_expression(bool stopAtParen)
{
return nullptr;
}
lhs.reset(new unary_operator<'-', std::negate<valty>>(std::move(subexpr)));
lhs.reset(new unary_operator<'-', std::negate<valty>>(l, std::move(subexpr)));
break;
}
case '!':
@ -647,7 +882,7 @@ expression_ptr input_buffer::parse_expression(bool stopAtParen)
{
return nullptr;
}
lhs.reset(new unary_operator<'!', std::logical_not<valty>>(std::move(subexpr)));
lhs.reset(new unary_operator<'!', std::logical_not<valty>>(l, std::move(subexpr)));
break;
}
case '~':
@ -658,7 +893,7 @@ expression_ptr input_buffer::parse_expression(bool stopAtParen)
{
return nullptr;
}
lhs.reset(new unary_operator<'~', bit_not<valty>>(std::move(subexpr)));
lhs.reset(new unary_operator<'~', bit_not<valty>>(l, std::move(subexpr)));
break;
}
}
@ -670,9 +905,9 @@ expression_ptr input_buffer::parse_expression(bool stopAtParen)
}
bool
input_buffer::consume_integer_expression(unsigned long long &outInt)
text_input_buffer::consume_integer_expression(unsigned long long &outInt)
{
switch ((*this)[0])
switch (*(*this))
{
case '(':
{
@ -681,8 +916,13 @@ input_buffer::consume_integer_expression(unsigned long long &outInt)
{
return false;
}
outInt = (*e)();
return true;
auto r = (*e)();
if (r.second)
{
outInt = r.first;
return true;
}
return false;
}
case '0'...'9':
return consume_integer(outInt);
@ -703,58 +943,80 @@ input_buffer::consume_hex_byte(uint8_t &outByte)
return true;
}
input_buffer&
input_buffer::next_token()
text_input_buffer&
text_input_buffer::next_token()
{
auto &self = *this;
int start;
do {
start = cursor;
skip_spaces();
if (finished())
{
return self;
}
// Parse /* comments
if ((*this)[0] == '/' && (*this)[1] == '*')
if (*self == '/' && peek() == '*')
{
// eat the start of the comment
++(*this);
++(*this);
++self;
++self;
do {
// Find the ending * of */
while ((**this != '\0') && (**this != '*'))
while ((*self != '\0') && (*self != '*') && !finished())
{
++(*this);
++self;
}
// Eat the *
++(*this);
} while ((**this != '\0') && (**this != '/'));
++self;
} while ((*self != '\0') && (*self != '/') && !finished());
// Eat the /
++(*this);
++self;
}
// Parse // comments
if (((*this)[0] == '/' && (*this)[1] == '/'))
if ((*self == '/' && peek() == '/'))
{
// eat the start of the comment
++(*this);
++(*this);
++self;
++self;
// Find the ending of the line
while (**this != '\n')
while (*self != '\n' && !finished())
{
++(*this);
++self;
}
// Eat the \n
++(*this);
++self;
}
} while (start != cursor);
return *this;
return self;
}
void
input_buffer::parse_error(const char *msg)
text_input_buffer::parse_error(const char *msg)
{
if (input_stack.empty())
{
fprintf(stderr, "Error: %s\n", msg);
return;
}
input_buffer &b = *input_stack.top();
parse_error(msg, b, b.cursor);
}
void
text_input_buffer::parse_error(const char *msg,
input_buffer &b,
int loc)
{
int line_count = 1;
int line_start = 0;
int line_end = cursor;
for (int i=cursor ; i>0 ; --i)
int line_end = loc;
if (loc < 0 || loc > b.size)
{
if (buffer[i] == '\n')
return;
}
for (int i=loc ; i>0 ; --i)
{
if (b.buffer[i] == '\n')
{
line_count++;
if (line_start == 0)
@ -763,20 +1025,20 @@ input_buffer::parse_error(const char *msg)
}
}
}
for (int i=cursor+1 ; i<size ; ++i)
for (int i=loc+1 ; i<b.size ; ++i)
{
if (buffer[i] == '\n')
if (b.buffer[i] == '\n')
{
line_end = i;
break;
}
}
fprintf(stderr, "Error on line %d: %s\n", line_count, msg);
fwrite(&buffer[line_start], line_end-line_start, 1, stderr);
fprintf(stderr, "Error at %s:%d:%d: %s\n", b.filename().c_str(), line_count, loc - line_start, msg);
fwrite(&b.buffer[line_start], line_end-line_start, 1, stderr);
putc('\n', stderr);
for (int i=0 ; i<(cursor-line_start) ; ++i)
for (int i=0 ; i<(loc-line_start) ; ++i)
{
char c = (buffer[i+line_start] == '\t') ? '\t' : ' ';
char c = (b.buffer[i+line_start] == '\t') ? '\t' : ' ';
putc(c, stderr);
}
putc('^', stderr);
@ -791,40 +1053,168 @@ input_buffer::dump()
}
#endif
mmap_input_buffer::mmap_input_buffer(int fd) : input_buffer(0, 0)
namespace
{
struct stat sb;
if (fstat(fd, &sb))
/**
* The source files are ASCII, so we provide a non-locale-aware version of
* isalpha. This is a class so that it can be used with a template function
* for parsing strings.
*/
struct is_alpha
{
static inline bool check(const char c)
{
perror("Failed to stat file");
return ((c >= 'a') && (c <= 'z')) || ((c >= 'A') &&
(c <= 'Z'));
}
size = sb.st_size;
buffer = (const char*)mmap(0, size, PROT_READ, MAP_PRIVATE |
MAP_PREFAULT_READ, fd, 0);
if (buffer == MAP_FAILED)
};
/**
* Check whether a character is in the set allowed for node names. This is a
* class so that it can be used with a template function for parsing strings.
*/
struct is_node_name_character
{
static inline bool check(const char c)
{
perror("Failed to mmap file");
exit(EXIT_FAILURE);
switch(c)
{
default:
return false;
case 'a'...'z': case 'A'...'Z': case '0'...'9':
case ',': case '.': case '+': case '-':
case '_':
return true;
}
}
};
/**
* Check whether a character is in the set allowed for property names. This is
* a class so that it can be used with a template function for parsing strings.
*/
struct is_property_name_character
{
static inline bool check(const char c)
{
switch(c)
{
default:
return false;
case 'a'...'z': case 'A'...'Z': case '0'...'9':
case ',': case '.': case '+': case '-':
case '_': case '#':
return true;
}
}
};
template<class T>
string parse(text_input_buffer &s)
{
std::vector<char> bytes;
for (char c=*s ; T::check(c) ; c=*(++s))
{
bytes.push_back(c);
}
return string(bytes.begin(), bytes.end());
}
mmap_input_buffer::~mmap_input_buffer()
{
if (buffer != 0)
{
munmap((void*)buffer, size);
}
}
stream_input_buffer::stream_input_buffer() : input_buffer(0, 0)
string
text_input_buffer::parse_node_name()
{
int c;
while ((c = fgetc(stdin)) != EOF)
return parse<is_node_name_character>(*this);
}
string
text_input_buffer::parse_property_name()
{
return parse<is_property_name_character>(*this);
}
string
text_input_buffer::parse_node_or_property_name(bool &is_property)
{
if (is_property)
{
b.push_back(c);
return parse_property_name();
}
buffer = b.data();
size = b.size();
std::vector<char> bytes;
for (char c=*(*this) ; is_node_name_character::check(c) ; c=*(++(*this)))
{
bytes.push_back(c);
}
for (char c=*(*this) ; is_property_name_character::check(c) ; c=*(++(*this)))
{
bytes.push_back(c);
is_property = true;
}
return string(bytes.begin(), bytes.end());
}
string
input_buffer::parse_to(char stop)
{
std::vector<char> bytes;
for (char c=*(*this) ; c != stop ; c=*(++(*this)))
{
bytes.push_back(c);
}
return string(bytes.begin(), bytes.end());
}
string
text_input_buffer::parse_to(char stop)
{
std::vector<char> bytes;
for (char c=*(*this) ; c != stop ; c=*(++(*this)))
{
if (finished())
{
break;
}
bytes.push_back(c);
}
return string(bytes.begin(), bytes.end());
}
char
text_input_buffer::peek()
{
return (*input_stack.top())[1];
}
std::unique_ptr<input_buffer>
input_buffer::buffer_for_file(const string &path, bool warn)
{
if (path == "-")
{
std::unique_ptr<input_buffer> b(new stream_input_buffer());
return b;
}
int source = open(path.c_str(), O_RDONLY);
if (source == -1)
{
if (warn)
{
fprintf(stderr, "Unable to open file '%s'. %s\n", path.c_str(), strerror(errno));
}
return 0;
}
struct stat st;
if (fstat(source, &st) == 0 && S_ISDIR(st.st_mode))
{
if (warn)
{
fprintf(stderr, "File %s is a directory\n", path.c_str());
}
close(source);
return 0;
}
std::unique_ptr<input_buffer> b(new mmap_input_buffer(source, std::string(path)));
close(source);
return b;
}
} // namespace dtc

365
usr.bin/dtc/input_buffer.hh
View File

@ -34,6 +34,9 @@
#define _INPUT_BUFFER_HH_
#include "util.hh"
#include <assert.h>
#include <stack>
#include <string>
#include <unordered_set>
namespace dtc
{
@ -55,6 +58,7 @@ typedef std::unique_ptr<expression> expression_ptr;
*/
class input_buffer
{
friend class text_input_buffer;
protected:
/**
* The buffer. This class doesn't own the buffer, but the
@ -66,17 +70,6 @@ class input_buffer
*/
int size;
private:
/**
* Parse an expression. If `stopAtParen` is set, then only parse a number
* or a parenthetical expression, otherwise assume that either is the
* left-hand side of a binary expression and try to parse the right-hand
* side.
*/
expression_ptr parse_expression(bool stopAtParen=false);
/**
* Parse a binary expression, having already parsed the right-hand side.
*/
expression_ptr parse_binary_expression(expression_ptr lhs);
/**
* The current place in the buffer where we are reading. This class
* keeps a separate size, pointer, and cursor so that we can move
@ -90,12 +83,27 @@ class input_buffer
*/
input_buffer(const char* b, int s, int c) : buffer(b), size(s),
cursor(c) {}
/**
* Reads forward past any spaces. The DTS format is not whitespace
* sensitive and so we want to scan past whitespace when reading it.
*/
void skip_spaces();
public:
/**
* Returns the file name associated with this buffer.
*/
virtual const std::string &filename() const
{
static std::string s;
return s;
}
static std::unique_ptr<input_buffer> buffer_for_file(const std::string &path,
bool warn=true);
/**
* Skips all characters in the input until the specified character is
* encountered.
*/
void skip_to(char);
/**
* Parses up to a specified character and returns the intervening
* characters as a string.
*/
std::string parse_to(char);
/**
* Return whether all input has been consumed.
*/
@ -124,13 +132,6 @@ class input_buffer
* buffer that extends to the end of the available memory.
*/
input_buffer buffer_from_offset(int offset, int s=0);
/**
* Returns true if this buffer has no unconsumed space in it.
*/
inline bool empty()
{
return cursor >= size;
}
/**
* Dereferencing operator, allows the buffer to be treated as a char*
* and dereferenced to give a character. This returns a null byte if
@ -163,16 +164,6 @@ class input_buffer
cursor++;
return *this;
}
/**
* Cast to char* operator. Returns a pointer into the buffer that can
* be used for constructing strings.
*/
inline operator const char*()
{
if (cursor >= size) { return 0; }
if (cursor < 0) { return 0; }
return &buffer[cursor];
}
/**
* Consumes a character. Moves the cursor one character forward if the
* next character matches the argument, returning true. If the current
@ -180,7 +171,7 @@ class input_buffer
*/
inline bool consume(char c)
{
if ((*this)[0] == c)
if (*(*this) == c)
{
++(*this);
return true;
@ -207,6 +198,13 @@ class input_buffer
* operators), evaluates it, and returns the result.
*/
bool consume_integer_expression(unsigned long long &outInt);
/**
* Consumes two hex digits and return the resulting byte via the first
* argument. If the next two characters are hex digits, returns true
* and advances the cursor. If not, then returns false and leaves the
* cursor in place.
*/
bool consume_hex_byte(uint8_t &outByte);
/**
* Template function that consumes a binary value in big-endian format
* from the input stream. Returns true and advances the cursor if
@ -232,28 +230,15 @@ class input_buffer
out = 0;
for (int i=0 ; i<type_size ; ++i)
{
if (size < cursor)
{
return false;
}
out <<= 8;
out |= (((T)buffer[cursor++]) & 0xff);
}
return true;
}
/**
* Consumes two hex digits and return the resulting byte via the first
* argument. If the next two characters are hex digits, returns true
* and advances the cursor. If not, then returns false and leaves the
* cursor in place.
*/
bool consume_hex_byte(uint8_t &outByte);
/**
* Advances the cursor to the start of the next token, skipping
* comments and whitespace. If the cursor already points to the start
* of a token, then this function does nothing.
*/
input_buffer &next_token();
/**
* Prints a message indicating the location of a parse error.
*/
void parse_error(const char *msg);
#ifndef NDEBUG
/**
* Dumps the current cursor value and the unconsumed values in the
@ -278,37 +263,273 @@ inline bool input_buffer::consume_binary(uint8_t &out)
}
/**
* Subclass of input_buffer that mmap()s a file and owns the resulting memory.
* When this object is destroyed, the memory is unmapped.
* An input buffer subclass used for parsing DTS files. This manages a stack
* of input buffers to handle /input/ operations.
*/
struct mmap_input_buffer : public input_buffer
class text_input_buffer
{
std::unordered_set<std::string> defines;
/**
* Constructs a new buffer from the file passed in as a file
* descriptor.
* The cursor is the input into the input stream where we are currently reading.
*/
mmap_input_buffer(int fd);
int cursor = 0;
/**
* Unmaps the buffer, if one exists.
* The current stack of includes. The current input is always from the top
* of the stack.
*/
virtual ~mmap_input_buffer();
};
/**
* Input buffer read from standard input. This is used for reading device tree
* blobs and source from standard input. It reads the entire input into
* malloc'd memory, so will be very slow for large inputs. DTS and DTB files
* are very rarely more than 10KB though, so this is probably not a problem.
*/
struct stream_input_buffer : public input_buffer
{
std::stack<std::shared_ptr<input_buffer>> input_stack;
/**
* The buffer that will store the data read from the standard input.
*
*/
std::vector<char> b;
const std::vector<std::string> include_paths;
/**
* Constructs a new buffer from the standard input.
* Reads forward past any spaces. The DTS format is not whitespace
* sensitive and so we want to scan past whitespace when reading it.
*/
stream_input_buffer();
void skip_spaces();
/**
* Returns the character immediately after the current one.
*
* This method does not look between files.
*/
char peek();
/**
* If a /include/ token is encountered, then look up the corresponding
* input file, push it onto the input stack, and continue.
*/
void handle_include();
/**
* The base directory for this file.
*/
const std::string dir;
/**
* The file where dependencies should be output.
*/
FILE *depfile;
public:
/**
* Construct a new text input buffer with the specified buffer as the start
* of parsing and the specified set of input paths for handling new
* inclusions.
*/
text_input_buffer(std::unique_ptr<input_buffer> &&b,
std::unordered_set<std::string> &&d,
std::vector<std::string> &&i,
const std::string directory,
FILE *deps)
: defines(d), include_paths(i), dir(directory), depfile(deps)
{
input_stack.push(std::move(b));
}
/**
* Skips all characters in the input until the specified character is
* encountered.
*/
void skip_to(char);
/**
* Parse an expression. If `stopAtParen` is set, then only parse a number
* or a parenthetical expression, otherwise assume that either is the
* left-hand side of a binary expression and try to parse the right-hand
* side.
*/
expression_ptr parse_expression(bool stopAtParen=false);
/**
* Parse a binary expression, having already parsed the right-hand side.
*/
expression_ptr parse_binary_expression(expression_ptr lhs);
/**
* Return whether all input has been consumed.
*/
bool finished()
{
return input_stack.empty() ||
((input_stack.size() == 1) && input_stack.top()->finished());
}
/**
* Dereferencing operator. Returns the current character in the top input buffer.
*/
inline char operator*()
{
if (input_stack.empty())
{
return 0;
}
return *(*input_stack.top());
}
/**
* Increments the cursor, iterating forward in the buffer.
*/
inline text_input_buffer &operator++()
{
if (input_stack.empty())
{
return *this;
}
cursor++;
auto &top = *input_stack.top();
++top;
if (top.finished())
{
input_stack.pop();
}
return *this;
}
/**
* Consumes a character. Moves the cursor one character forward if the
* next character matches the argument, returning true. If the current
* character does not match the argument, returns false.
*/
inline bool consume(char c)
{
if (*(*this) == c)
{
++(*this);
return true;
}
return false;
}
/**
* Consumes a string. If the (null-terminated) string passed as the
* argument appears in the input, advances the cursor to the end and
* returns true. Returns false if the string does not appear at the
* current point in the input.
*
* This method does not scan between files.
*/
bool consume(const char *str)
{
if (input_stack.empty())
{
return false;
}
return input_stack.top()->consume(str);
}
/**
* Reads an integer in base 8, 10, or 16. Returns true and advances
* the cursor to the end of the integer if the cursor points to an
* integer, returns false and does not move the cursor otherwise.
*
* The parsed value is returned via the argument.
*
* This method does not scan between files.
*/
bool consume_integer(unsigned long long &outInt)
{
if (input_stack.empty())
{
return false;
}
return input_stack.top()->consume_integer(outInt);
}
/**
* Reads an arithmetic expression (containing any of the normal C
* operators), evaluates it, and returns the result.
*/
bool consume_integer_expression(unsigned long long &outInt);
/**
* Consumes two hex digits and return the resulting byte via the first
* argument. If the next two characters are hex digits, returns true
* and advances the cursor. If not, then returns false and leaves the
* cursor in place.
*
* This method does not scan between files.
*/
bool consume_hex_byte(uint8_t &outByte)
{
if (input_stack.empty())
{
return false;
}
return input_stack.top()->consume_hex_byte(outByte);
}
/**
* Returns the longest string in the input buffer starting at the
* current cursor and composed entirely of characters that are valid in
* node names.
*/
std::string parse_node_name();
/**
* Returns the longest string in the input buffer starting at the
* current cursor and composed entirely of characters that are valid in
* property names.
*/
std::string parse_property_name();
/**
* Parses either a node or a property name. If is_property is true on
* entry, then only property names are parsed. If it is false, then it
* will be set, on return, to indicate whether the parsed name is only
* valid as a property.
*/
std::string parse_node_or_property_name(bool &is_property);
/**
* Parses up to a specified character and returns the intervening
* characters as a string.
*/
std::string parse_to(char);
/**
* Advances the cursor to the start of the next token, skipping
* comments and whitespace. If the cursor already points to the start
* of a token, then this function does nothing.
*/
text_input_buffer &next_token();
/**
* Location in the source file. This should never be interpreted by
* anything other than error reporting functions of this class. It will
* eventually become something more complex than an `int`.
*/
class source_location
{
friend class text_input_buffer;
/**
* The text buffer object that included `b`.
*/
text_input_buffer &buffer;
/**
* The underlying buffer that contains this location.
*/
std::shared_ptr<input_buffer> b;
/**
* The offset within the current buffer of the source location.
*/
int cursor;
source_location(text_input_buffer &buf)
: buffer(buf),
b(buf.input_stack.empty() ? nullptr : buf.input_stack.top()),
cursor(b ? b->cursor : 0) {}
public:
/**
* Report an error at this location.
*/
void report_error(const char *msg)
{
if (b)
{
buffer.parse_error(msg, *b, cursor);
}
else
{
buffer.parse_error(msg);
}
}
};
/**
* Returns the current source location.
*/
source_location location()
{
return { *this };
}
/**
* Prints a message indicating the location of a parse error.
*/
void parse_error(const char *msg);
private:
/**
* Prints a message indicating the location of a parse error, given a
* specified location. This is used when input has already moved beyond
* the location that caused the failure.
*/
void parse_error(const char *msg, input_buffer &b, int loc);
};
} // namespace dtc

182
usr.bin/dtc/string.cc
View File

@ -30,150 +30,29 @@
* $FreeBSD$
*/
#include "string.hh"
#include <string>
#include <cstdio>
#include <cstdlib>
#include <ctype.h>
#include <stdio.h>
#include <libgen.h>
namespace
{
/**
* The source files are ASCII, so we provide a non-locale-aware version of
* isalpha. This is a class so that it can be used with a template function
* for parsing strings.
*/
struct is_alpha
{
static inline bool check(const char c)
{
return ((c >= 'a') && (c <= 'z')) || ((c >= 'A') &&
(c <= 'Z'));
}
};
/**
* Check whether a character is in the set allowed for node names. This is a
* class so that it can be used with a template function for parsing strings.
*/
struct is_node_name_character
{
static inline bool check(const char c)
{
switch(c)
{
default:
return false;
case 'a'...'z': case 'A'...'Z': case '0'...'9':
case ',': case '.': case '+': case '-':
case '_':
return true;
}
}
};
/**
* Check whether a character is in the set allowed for property names. This is
* a class so that it can be used with a template function for parsing strings.
*/
struct is_property_name_character
{
static inline bool check(const char c)
{
switch(c)
{
default:
return false;
case 'a'...'z': case 'A'...'Z': case '0'...'9':
case ',': case '.': case '+': case '-':
case '_': case '#':
return true;
}
}
};
#include "util.hh"
}
using std::string;
namespace dtc
{
template<class T> string
string::parse(input_buffer &s)
{
const char *start = s;
int l=0;
while (T::check(*s)) { l++; ++s; }
return string(start, l);
}
string::string(input_buffer &s) : start((const char*)s), length(0)
{
while(s[length] != '\0')
{
length++;
}
}
string
string::parse_node_name(input_buffer &s)
{
return parse<is_node_name_character>(s);
}
string
string::parse_property_name(input_buffer &s)
{
return parse<is_property_name_character>(s);
}
string
string::parse_node_or_property_name(input_buffer &s, bool &is_property)
{
if (is_property)
{
return parse_property_name(s);
}
const char *start = s;
int l=0;
while (is_node_name_character::check(*s))
{
l++;
++s;
}
while (is_property_name_character::check(*s))
{
l++;
++s;
is_property = true;
}
return string(start, l);
}
bool
string::operator==(const string& other) const
{
return (length == other.length) &&
(memcmp(start, other.start, length) == 0);
}
bool
string::operator==(const char *other) const
{
return strncmp(other, start, length) == 0;
}
bool
string::operator<(const string& other) const
{
if (length < other.length) { return true; }
if (length > other.length) { return false; }
return memcmp(start, other.start, length) < 0;
}
void
string::push_to_buffer(byte_buffer &buffer, bool escapes)
push_string(byte_buffer &buffer, const string &s, bool escapes)
{
for (int i=0 ; i<length ; ++i)
size_t length = s.size();
for (size_t i=0 ; i<length ; ++i)
{
uint8_t c = start[i];
uint8_t c = s[i];
if (escapes && c == '\\' && i+1 < length)
{
c = start[++i];
c = s[++i];
switch (c)
{
// For now, we just ignore invalid escape sequences.
@ -206,15 +85,15 @@ string::push_to_buffer(byte_buffer &buffer, bool escapes)
case '0'...'7':
{
int v = digittoint(c);
if (i+1 < length && start[i+1] <= '7' && start[i+1] >= '0')
if (i+1 < length && s[i+1] <= '7' && s[i+1] >= '0')
{
v <<= 3;
v |= digittoint(start[i+1]);
v |= digittoint(s[i+1]);
i++;
if (i+1 < length && start[i+1] <= '7' && start[i+1] >= '0')
if (i+1 < length && s[i+1] <= '7' && s[i+1] >= '0')
{
v <<= 3;
v |= digittoint(start[i+1]);
v |= digittoint(s[i+1]);
}
}
c = (uint8_t)v;
@ -227,11 +106,11 @@ string::push_to_buffer(byte_buffer &buffer, bool escapes)
{
break;
}
int v = digittoint(start[i]);
if (i+1 < length && ishexdigit(start[i+1]))
int v = digittoint(s[i]);
if (i+1 < length && ishexdigit(s[i+1]))
{
v <<= 4;
v |= digittoint(start[++i]);
v |= digittoint(s[++i]);
}
c = (uint8_t)v;
break;
@ -242,17 +121,28 @@ string::push_to_buffer(byte_buffer &buffer, bool escapes)
}
}
void
string::print(FILE *file)
std::string dirname(const string &s)
{
fwrite(start, length, 1, file);
if (s == string())
{
return string();
}
char *str = strdup(s.c_str());
string dn(::dirname(str));
free(str);
return dn;
}
void
string::dump()
std::string basename(const string &s)
{
print(stderr);
if (s == string())
{
return string();
}
char *str = strdup(s.c_str());
string bn(::basename(str));
free(str);
return bn;
}
} // namespace dtc

25
usr.bin/dtc/util.hh
View File

@ -68,6 +68,8 @@ inline void push_big_endian(byte_buffer &v, T val)
}
}
void push_string(byte_buffer &v, const std::string &s, bool escapes=false);
/**
* Simple inline non-locale-aware check that this is a valid ASCII
* digit.
@ -84,9 +86,30 @@ inline bool isdigit(char c)
inline bool ishexdigit(char c)
{
return ((c >= '0') && (c <= '9')) || ((c >= 'a') && (c <= 'f')) ||
((c >= 'A') && (c <= 'Z'));
((c >= 'A') && (c <= 'F'));
}
/**
* Simple inline non-locale-aware check that this is a valid ASCII
* letter.
*/
inline bool isalpha(char c)
{
return ((c >= 'a') && (c <= 'z')) || ((c >= 'A') && (c <= 'Z'));
}
/**
* A wrapper around dirname(3) that handles inconsistencies relating to memory
* management between platforms and provides a std::string interface.
*/
std::string dirname(const std::string&);
/**
* A wrapper around basename(3) that handles inconsistencies relating to memory
* management between platforms and provides a std::string interface.
*/
std::string basename(const std::string&);
}// namespace dtc
#endif // !_UTIL_HH_