diff options
Diffstat (limited to 'wasm.cpp')
| -rw-r--r-- | wasm.cpp | 1108 |
1 files changed, 1108 insertions, 0 deletions
diff --git a/wasm.cpp b/wasm.cpp new file mode 100644 index 0000000..7bd6920 --- /dev/null +++ b/wasm.cpp @@ -0,0 +1,1108 @@ +#include "instr.h" +#include "wasm.h" +#include "types.h" +#include <dwarf.h> +#include <libdwarf/libdwarf.h> +#include <QFile> +#include <QString> +#include <cerrno> +#include <cstdint> +#include <cstdlib> +#include <cstring> +#include <stdexcept> + +const char *const Wasm::names[NSECTIONS] = +{ + "", + ".debug_abbrev", + ".debug_info", + ".debug_str", + ".debug_aranges", + ".debug_frame", + ".debug_line", + ".debug_loc", + ".debug_macinfo", + ".debug_pubnames", + ".debug_pubtypes", + ".debug_ranges", + ".debug_types" +}; + +static void errcb(const Dwarf_Error e, const Dwarf_Ptr args) +{ + fprintf(stderr, "%s\n", __func__); +} + +int Wasm::get_section_info(void *const obj, const Dwarf_Half section_index, + Dwarf_Obj_Access_Section *const return_section, int *const error) +{ + const Wasm *const w = static_cast<const Wasm *>(obj); + + if (section_index >= sizeof w->sections / sizeof *w->sections) + { + fprintf(stderr, "%s: invalid section_index: %hd\n", __func__, + section_index); + return DW_DLV_ERROR; + } + + const struct dwsection *const s = &w->sections[section_index]; + + if (!names[section_index] && !s->len) + return DW_DLV_NO_ENTRY; + + return_section->size = s->len; + return_section->addr = s->offset; + return_section->name = names[section_index]; + return 0; +} + +static Dwarf_Endianness get_byte_order(void *const obj) +{ + return DW_OBJECT_LSB; +} + +static Dwarf_Small get_length_size(void *const obj) +{ + return sizeof (uint32_t); +} + +static Dwarf_Small get_pointer_size(void *const obj) +{ + return sizeof (uint32_t); +} + +Dwarf_Unsigned Wasm::get_section_count(void *const obj) +{ + const Wasm *const w = static_cast<const Wasm *>(obj); + Dwarf_Unsigned ret = 0; + + for (size_t i = 0; i < sizeof w->sections / sizeof *w->sections; i++) + if (w->sections[i].offset) + ret++; + + return ret; +} + +int Wasm::load_section(void *const obj, const Dwarf_Half section_index, + Dwarf_Small **const return_data, int *const error) +{ + Wasm *const w = static_cast<Wasm *>(obj); + FILE *const f = w->f; + struct dwsection *s; + const char *name; + + if (section_index >= NSECTIONS) + { + fprintf(stderr, "%s: invalid section_index %hd\n", __func__, + section_index); + return DW_DLV_ERROR; + } + + s = &w->sections[section_index]; + name = names[section_index]; + + QVector<Dwarf_Small> &p = s->data; + + if (!s->offset) + { + fprintf(stderr, "%s: unavailable section: %s\n", __func__, name); + return DW_DLV_ERROR; + } + else if (!s->len) + { + fprintf(stderr, "%s: unexpected zero length for section: %s\n", + __func__, name); + return DW_DLV_ERROR; + } + + p.reserve(s->len); + + if (fseek(f, s->offset, SEEK_SET)) + { + fprintf(stderr, "%s: fseek(3): %s\n", __func__, strerror(errno)); + return DW_DLV_ERROR; + } + else if (!fread(p.data(), s->len, 1, f)) + { + fprintf(stderr, "%s: fread(3) failed, feof=%d, ferror=%d\n", __func__, + feof(f), ferror(f)); + return DW_DLV_ERROR; + } + + *return_data = p.data(); + return DW_DLV_OK; +} + +int Wasm::check_header(QString &error) const +{ + uint8_t magic[sizeof "asm"], version[sizeof (uint32_t)]; + static const uint8_t exp[sizeof version] = {1, 0, 0, 0}; + + if (!fread(magic, sizeof magic, 1, f)) + { + error = QString("fread(3) magic failed, feof=") + + QString::number(feof(f)) + ", ferror=" + + QString::number(ferror(f)); + return -1; + } + else if (memcmp(magic, "\0asm", sizeof magic)) + { + error = "invalid magic number"; + return -1; + } + else if (!fread(version, sizeof version, 1, f)) + { + error = QString("fread(3) version failed, feof=") + + QString::number(feof(f)) + ", ferror=" + + QString::number(ferror(f)); + return -1; + } + else if (memcmp(version, exp, sizeof version)) + { + error = "invalid version number"; + return -1; + } + + return 0; +} + +int Wasm::read_name(QString &name, QString &error) const +{ + varuint32 name_len; + + if (read_varuint32(f, &name_len)) + { + error = "read_varuint32 failed"; + return -1; + } + + for (varuint32 i = 0; i < name_len; i++) + { + uint8_t c; + const size_t r = fread(&c, sizeof c, 1, f); + + if (!r) + { + error = "fread(3) failed, ferror(3)=" + + QString::number(ferror(f)) + "feof(3)=" + + QString::number(feof(f)); + return -1; + } + + name += c; + } + + return 0; +} + +int Wasm::parse_header(section &s, QString &error) const +{ + varuint7 code; + varuint32 payload_len; + QString name; + long before, after; + + if (read_varuint7(f, &code)) + { + /* Exceptionally, this might not be a fatal error. */ + if (!feof(f)) + error = "read_varuint7 failed"; + + return -1; + } + else if (read_varuint32(f, &payload_len)) + { + error = "read_varuint32 failed"; + return -1; + } + else if ((before = ftell(f)) < 0) + { + error = QString("ftell(3) before: ") + strerror(errno); + return -1; + } + else if (!code && read_name(name, error)) + return -1; + else if ((after = ftell(f)) < 0) + { + error = QString("ftell(3) after: ") + strerror(errno); + return -1; + } + + const unsigned long sz = after - before; + + if (payload_len < sz) + { + error = "section " + QString::number(code) + + ": expected payload_len >= " + QString::number(sz) + + ", got " + QString::number(payload_len); + return -1; + } + + s.code = code; + s.len = payload_len - sz; + s.name = name; + return 0; +} + +int Wasm::skip(const section &s, QString &error) const +{ + const int ret = fseek(f, s.len, SEEK_CUR); + + if (ret) + error = QString("fseek(3): ") + strerror(errno); + + return ret; +} + +Wasm::dwsection *Wasm::getdws(const QString &name) +{ + for (size_t i = 0; i < sizeof names / sizeof *names; i++) + if (name == names[i]) + return §ions[i]; + + return NULL; +} + +int Wasm::parse_global(QString &error) +{ + varuint32 count; + + if (read_varuint32(f, &count)) + { + error = "read_varuint32 failed"; + return -1; + } + + for (varuint32 i = 0; i < count; i++) + { + WasmGlobal gl; + WasmType wtype; + value_type content_type; + varuint1 mutability; + + if (read_value_type(f, &content_type)) + { + error = "read_value_type failed"; + return -1; + } + else if (get_type(content_type, wtype)) + { + error = "Invalid type for global " + QString::number(i) + + ": 0x" + QString::number(content_type, 16); + return -1; + } + else if (read_varuint1(f, &mutability)) + { + error = "read_varuint1 failed"; + return -1; + } + + int ret; + bool end; + WasmInstr instr; + + while (!(ret = WasmInstr::parse(f, instr, error, &end)) && !end) + ; + + if (ret) + return ret; + + gl.mutability = mutability; + gl.type = wtype; + vglobals.push_back(gl); + } + + return 0; +} + +int Wasm::parse_import(QString &error) +{ + varuint32 fncnt = 0, count; + + if (read_varuint32(f, &count)) + { + error = "read_varuint32 failed"; + return -1; + } + + for (varuint32 i = 0; i < count; i++) + { + varuint32 module_len, field_len; + quint8 external_kind; + enum {FUNCTION, TABLE, MEMORY, GLOBAL}; + + if (read_varuint32(f, &module_len)) + { + error = "read_varuint32 failed"; + return -1; + } + else if (fseek(f, module_len, SEEK_CUR)) + { + error = QString("fseek(3): ") + strerror(errno); + return -1; + } + else if (read_varuint32(f, &field_len)) + { + error = "read_varuint32 failed"; + return -1; + } + else if (fseek(f, field_len, SEEK_CUR)) + { + error = QString("fseek(3): ") + strerror(errno); + return -1; + } + else if (!fread(&external_kind, sizeof external_kind, 1, f)) + { + error = "fread(3) failed, ferror(3)=" + QString::number(ferror(f)) + + ", feof(3)=" + QString::number(feof(f)); + return -1; + } + else if (external_kind == FUNCTION) + { + varuint32 type; + + if (read_varuint32(f, &type)) + { + error = "read_varuint32 failed"; + return -1; + } + + fncnt++; + } + } + + import_fncnt = fncnt; + return 0; +} + +int Wasm::get_type(const value_type type, WasmType &wtype) const +{ + static const struct + { + value_type v; + WasmType wtype; + } types[] = + { + {0x7f, WasmType::i32}, + {0x7e, WasmType::i64}, + {0x7d, WasmType::f32}, + {0x7c, WasmType::f64} + }; + + for (const auto &t : types) + if (type == t.v) + { + wtype = t.wtype; + return 0; + } + + return -1; +} + +int Wasm::parse_body(const varuint32 index, QString &error) +{ + varuint32 body_size, local_count; + QVector<WasmLocal> locals; + long start; + + if (read_varuint32(f, &body_size)) + { + error = "read_varuint32 failed"; + return -1; + } + else if ((start = ftell(f)) < 0) + { + error = QString("ftell(3)") + strerror(errno); + return -1; + } + else if (read_varuint32(f, &local_count)) + { + error = "read_varuint32 failed"; + return -1; + } + + for (varuint32 i = 0; i < local_count; i++) + { + varuint32 count; + value_type type; + WasmType wtype; + + if (read_varuint32(f, &count)) + { + error = "read_varuint32 failed"; + return -1; + } + else if (read_value_type(f, &type)) + { + error = "read_value_type failed"; + return -1; + } + else if (get_type(type, wtype)) + { + error = "Invalid value_type for function " + + QString::number(index) + ": 0x" + QString::number(type, 16); + return -1; + } + + for (varuint32 i = 0; i < count; i++) + { + WasmLocal l; + + l.type = wtype; + locals.push_back(l); + } + } + + const long end = ftell(f); + + if (end < 0) + { + error = QString("ftell(3)") + strerror(errno); + return -1; + } + + const unsigned long delta = end - start; + + if (delta >= body_size) + { + error = "Function " + QString::number(index) + + " exceeds maximum body preamble size (" + + QString::number(delta) + "/" + QString::number(body_size) + ")"; + return -1; + } + + const unsigned long len = body_size - delta; + QVector<WasmInstr> instr; + + if (WasmInstr::parse(f, len, instr, error)) + return -1; + + WasmRoutine r; + + r.lopc = end; + r.hipc = r.lopc + len; + r.instructions = instr; + r.locals = locals; + fmap[index + import_fncnt] = r; + return 0; +} + +int Wasm::parse_code(QString &error) +{ + varuint32 count; + + if (read_varuint32(f, &count)) + { + error = "read_varuint32 failed"; + return -1; + } + + for (varuint32 i = 0; i < count; i++) + if (parse_body(i, error)) + return -1; + + return 0; +} + +int Wasm::parse_fname(QString &error, const varuint32 maxlen) +{ + varuint32 count; + const long start = ftell(f); + + if (start < 0) + { + error = QString("ftell(3): ") + strerror(errno); + return -1; + } + else if (read_varuint32(f, &count)) + { + error = "read_varuint32 failed"; + return -1; + } + + for (varuint32 i = 0; i < count; i++) + { + varuint32 index, name_len; + QString name_payload_data; + + if (read_varuint32(f, &index) + || read_varuint32(f, &name_len)) + { + error = "read_varuint32 failed"; + return -1; + } + + for (varuint32 i = 0; i < name_len; i++) + { + quint8 b; + + if (!fread(&b, sizeof b, 1, f)) + { + error = "fread(3) failed, ferror(3)=" + + QString::number(ferror(f)) + ", feof(3)=" + + QString::number(feof(f)); + return -1; + } + + name_payload_data += b; + } + + if (index >= import_fncnt) + { + if (!fmap.contains(index)) + { + error = "Could not find function index " + + QString::number(index) + + " from code section (" + name_payload_data + ")"; + return -1; + } + + auto r = fmap[index]; + + r.name = name_payload_data; + fmap[index] = r; + } + } + + const long end = ftell(f); + + if (end < 0) + { + error = QString("ftell(3): ") + strerror(errno); + return -1; + } + + const unsigned long delta = end - start; + + if (delta != maxlen) + { + error = "Name entry mismatches expected length (" + + QString::number(delta) + "/" + QString::number(maxlen) + ")"; + return -1; + } + + return 0; +} + +int Wasm::parse_name(QString &error, varuint32 len) +{ + varuint7 name_type; + varuint32 name_payload_len; + enum {MODULE, FUNCTION, LOCAL}; + + while (len) + { + if (read_varuint7(f, &name_type)) + { + error = "read_varuint7 failed"; + return -1; + } + else if (read_varuint32(f, &name_payload_len)) + { + error = "read_varuint32 failed"; + return -1; + } + else if (!name_payload_len) + { + error = "Invalid zero name_payload_len"; + return -1; + } + else if (name_payload_len > len) + { + error = "name_payload_len exceeds maximum allowed length (" + + QString::number(name_payload_len) + "/" + + QString::number(len) + ")"; + return -1; + } + else if (name_type != FUNCTION) + { + if (name_type != LOCAL && name_type != MODULE) + { + error = "Invalid name_type: 0x" + + QString::number(name_type, 16); + return -1; + } + else if (fseek(f, name_payload_len, SEEK_CUR)) + { + error = QString("fseek(3): ") + strerror(errno); + return -1; + } + } + else + return parse_fname(error, name_payload_len); + + len -= name_payload_len; + } + + return 0; +} + +int Wasm::read_section(QString &error) +{ + struct section s; + struct dwsection *dws; + long start, offset; + + if ((start = ftell(f)) < 0) + { + error = QString("ftell(3) start") + strerror(errno); + return -1; + } + else if (parse_header(s, error)) + return -1; + else if (s.code == SECTION_GLOBAL) + return parse_global(error); + else if (s.code == SECTION_IMPORT) + return parse_import(error); + else if (s.code == SECTION_CODE) + { + code_offset = start; + return parse_code(error); + } + else if (s.code != SECTION_CUSTOM) + return skip(s, error); + else if (!(dws = getdws(s.name))) + { + if (s.name == "name") + return parse_name(error, s.len); + else + return skip(s, error); + } + else if ((offset = ftell(f)) < 0) + { + error = QString("ftell(3) offset") + strerror(errno); + return -1; + } + else + { + dws->len = s.len; + dws->offset = offset; + + return skip(s, error); + } + + return 0; +} + +int Wasm::parse(QString &error) +{ + if (check_header(error)) + return -1; + + for (;;) + if (read_section(error)) + { + if (feof(f)) + break; + + return -1; + } + + return 0; +} + +bool Wasm::isformstring(const Dwarf_Half form) +{ + switch (form) + { + case DW_FORM_string: + case DW_FORM_GNU_strp_alt: + case DW_FORM_GNU_str_index: + case DW_FORM_strx: + case DW_FORM_strx1: + case DW_FORM_strx2: + case DW_FORM_strx3: + case DW_FORM_strx4: + case DW_FORM_strp: + return true; + + default: + break; + } + + return false; +} + +bool Wasm::isformudata(const Dwarf_Half form) +{ + switch (form) + { + case DW_FORM_data1: + case DW_FORM_data2: + case DW_FORM_data4: + case DW_FORM_data8: + case DW_FORM_udata: + return true; + + default: + break; + } + + return false; +} + +bool Wasm::isformsdata(const Dwarf_Half form) +{ + switch (form) + { + case DW_FORM_data1: + case DW_FORM_data2: + case DW_FORM_data4: + case DW_FORM_data8: + case DW_FORM_sdata: + return true; + + default: + break; + } + + return false; +} + +int Wasm::read_attr(const Dwarf_Attribute a, Dwarf_Error &e, QString &error, + attr &attr) +{ + Dwarf_Half num, form; + const char *atname; + int res = dwarf_whatattr(a, &num, &e); + + if (res != DW_DLV_OK) + { + error = "dwarf_whatattr failed with " + QString::number(res); + return -1; + } + else if ((res = dwarf_whatform(a, &form, &e)) != DW_DLV_OK) + { + error = "dwarf_whatform failed with " + QString::number(res); + return -1; + } + else if ((res = dwarf_get_AT_name(num, &atname)) != DW_DLV_OK) + { + error = "dwarf_get_AT_name failed with " + QString::number(res); + return -1; + } + + attr.name = atname; + + /* TODO: extract type */ + + if (isformstring(form)) + { + char *s; + + if ((res = dwarf_formstring(a, &s, &e)) != DW_DLV_OK) + { + error = "dwarf_formstring failed with " + QString::number(res); + return -1; + } + + attr.value = QVariant(s); + } + else if (form == DW_FORM_addr) + { + Dwarf_Addr addr; + + if ((res = dwarf_formaddr(a, &addr, &e)) != DW_DLV_OK) + { + error = "dwarf_formaddr failed with " + QString::number(res); + return -1; + } + + attr.value = QVariant(addr); + } + else if (isformudata(form)) + { + Dwarf_Unsigned v; + + if ((res = dwarf_formudata(a, &v, &e)) != DW_DLV_OK) + { + error = "dwarf_formudata failed with " + QString::number(res); + return -1; + } + + attr.value = QVariant(v); + } + else if (isformudata(form)) + { + Dwarf_Signed v; + + if ((res = dwarf_formsdata(a, &v, &e)) != DW_DLV_OK) + { + error = "dwarf_formsdata failed with " + QString::number(res); + return -1; + } + + attr.value = QVariant(v); + } + + return 0; +} + +int Wasm::process_die(const Dwarf_Debug dbg, const Dwarf_Die die, + Dwarf_Error &e, QString &error) +{ + Dwarf_Half tag; + Dwarf_Attribute *attrs = NULL; + Dwarf_Signed nattr = 0; + const char *name; + QHash<QString, QVariant> attrmap; + int ret = -1, r = dwarf_tag(die, &tag, &e); + + if (r) + { + error = "dwarf_tag failed with" + QString::number(r); + goto end; + } + else if ((r = dwarf_get_TAG_name(tag, &name))) + name = "<bogus tag>"; + + if ((r = dwarf_attrlist(die, &attrs, &nattr, &e)) == DW_DLV_ERROR) + { + error = "dwarf_attrlist failed"; + goto end; + } + else if (r == DW_DLV_OK) + for (Dwarf_Signed i = 0; i < nattr; i++) + { + attr attr; + + if (read_attr(attrs[i], e, error, attr)) + goto end; + + attrmap[attr.name] = attr.value; + } + + if (!strcmp(name, "DW_TAG_subprogram")) + { + if (code_offset == -1) + { + error = "Code section expected"; + goto end; + } + else if (attrmap.contains("DW_AT_low_pc") + && attrmap["DW_AT_low_pc"].toUInt() != -1u + && attrmap.contains("DW_AT_high_pc")) + { + WasmRoutine wr; + auto name = attrmap["DW_AT_name"].toString(); + auto lopc = attrmap["DW_AT_low_pc"].toUInt() + code_offset, + hipc = attrmap["DW_AT_high_pc"].toUInt() + lopc; + auto r = routine(name); + + if (r.isValid() + || (r = routine(lopc)).isValid() + || (r = routine(hipc)).isValid()) + lastwr = QVariant::fromValue(fmap.key(r.value<WasmRoutine>())); + else + lastwr.clear(); + } + else + lastwr.clear(); + } + else if (!strcmp(name, "DW_TAG_formal_parameter") + && attrmap.contains("DW_AT_name") + && !lastwr.isNull()) + { + const auto index = lastwr.toUInt(); + WasmRoutine r = fmap[index]; + WasmParam wp; + + wp.name = attrmap["DW_AT_name"].toString(); + wp.dwtype = attrmap["DW_AT_type"].toString(); + r.params.push_back(wp); + fmap[index] = r; + } + + ret = 0; + +end: + + for (Dwarf_Signed i = 0; i < nattr; i++) + dwarf_dealloc_attribute(attrs[i]); + + dwarf_dealloc(dbg, attrs, DW_DLA_LIST); + return ret; +} + +int Wasm::read_child(const Dwarf_Debug dbg, Dwarf_Die die, Dwarf_Error &e, + QString &error) +{ + for (;;) + { + int r; + Dwarf_Die child, sibling; + + if (process_die(dbg, die, e, error)) + return -1; + else if ((r = dwarf_child(die, &child, &e)) == DW_DLV_OK) + { + const int ret = read_child(dbg, child, e, error); + + dwarf_dealloc_die(child); + + if (ret) + return ret; + } + else if (r == DW_DLV_ERROR) + { + error = "dwarf_child failed"; + return -1; + } + + if ((r = dwarf_siblingof(dbg, die, &sibling, &e)) == DW_DLV_ERROR) + { + error = "dwarf_siblingof failed"; + return -1; + } + else if (r == DW_DLV_NO_ENTRY) + break; + + die = sibling; + } + + return 0; +} + +int Wasm::read_dwarf(const Dwarf_Debug dbg, header &h, Dwarf_Error &e, + QString &error) +{ + Dwarf_Die die = 0; + int ret = -1; + + for (;;) + { + int r = dwarf_next_cu_header_d(dbg, 1, &h.cu_header_length, + &h.version_stamp, &h.abbrev_offset, &h.address_size, + &h.length_size, &h.extension_size, &h.type_signature, + &h.typeoffset, &h.next_cu_header_offset, &h.header_cu_type, &e); + + die = 0; + + if (r == DW_DLV_ERROR) + { + error = "dwarf_next_cu_header_d failed"; + goto end; + } + else if (r == DW_DLV_NO_ENTRY) + break; + else if ((r = dwarf_siblingof(dbg, NULL, &die, &e)) == DW_DLV_OK) + { + if (read_child(dbg, die, e, error)) + goto end; + } + else if (r == DW_DLV_ERROR) + { + error = "dwarf_siblingof failed with " + QString::number(r); + goto end; + } + else if (DW_DLV_NO_ENTRY) + break; + + dwarf_dealloc_die(die); + } + + ret = 0; + +end: + dwarf_dealloc_die(die); + return ret; +} + +int Wasm::open(const QString &path, QString &error) +{ + int ret = -1, result; + header h; + Dwarf_Obj_Access_Methods m = {0}; + Dwarf_Obj_Access_Interface aitf = {0}; + Dwarf_Debug dbg = 0; + Dwarf_Error dwerr = 0; + const std::string spath = path.toStdString(); + const char *const cpath = spath.c_str(); + + m.get_section_info = get_section_info; + m.get_byte_order = get_byte_order; + m.get_length_size = get_length_size; + m.get_pointer_size = get_pointer_size; + m.get_section_count = get_section_count; + m.load_section = load_section; + + aitf.object = this; + aitf.methods = &m; + + if (!(f = fopen(cpath, "rb"))) + { + error = "Could not open " + path; + goto end; + } + else if (parse(error)) + { + error = "Failed to parse " + path + ":\n" + error; + goto end; + } + else if ((result = dwarf_object_init(&aitf, errcb, this, &dbg, &dwerr)) + != DW_DLV_OK) + { + error = "dwarf_object_init failed with " + QString::number(result) + + ": " + dwarf_errmsg(dwerr); + goto end; + } + else if (read_dwarf(dbg, h, dwerr, error)) + goto end; + + ret = 0; + +end: + + if (f && fclose(f)) + { + error = "fclose(3) " + path + ": " + strerror(errno); + ret = -1; + } + else + f = nullptr; + + if (dbg && dwarf_object_finish(dbg, &dwerr)) + { + error = QString("dwarf_object_finish failed with: ") + + dwarf_errmsg(dwerr); + ret = -1; + } + + return ret; +} + +QVariant Wasm::routine(const QString &name) const +{ + for (const auto &r : fmap.values()) + if (r.name == name) + return QVariant::fromValue(r); + + return QVariant(); +} + +QVariant Wasm::routine(const quint32 addr) const +{ + for (const auto &r : fmap.values()) + if (addr >= r.lopc && addr <= r.hipc) + return QVariant::fromValue(r); + + return QVariant(); +} + +const QVector<WasmGlobal> Wasm::globals() const +{ + return vglobals; +} + +Wasm::Wasm() : + f(nullptr), + code_offset(-1), + import_fncnt(0) +{ +} + +Wasm::~Wasm() +{ + if (f && fclose(f)) + std::runtime_error(std::string("fopen(3): ") + strerror(errno)); +} |