First commitHEADmaster

5 files changed, 1794 insertions, 0 deletions

diff --git a/CMakeLists.txt b/CMakeLists.txt
new file mode 100644
index 0000000..6234a7a
--- /dev/null
+++ b/CMakeLists.txt
@@ -0,0 +1,9 @@
+cmake_minimum_required(VERSION 3.14)
+project(wadb VERSION 0.0.0 LANGUAGES C)
+add_executable(${PROJECT_NAME} main.c leb128.c)
+target_link_libraries(${PROJECT_NAME} PRIVATE dwarf)
+target_compile_options(${PROJECT_NAME} PRIVATE -Wall)
+
+if(CMAKE_BUILD_TYPE STREQUAL "Debug")
+    target_compile_options(${PROJECT_NAME} PRIVATE -Og)
+endif()
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..be3f7b2
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,661 @@
+                    GNU AFFERO GENERAL PUBLIC LICENSE
+                       Version 3, 19 November 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
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+software and other kinds of works, specifically designed to ensure
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+share and change all versions of a program--to make sure it remains free
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+  When we speak of free software, we are referring to freedom, not
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+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Affero General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Affero General Public License for more details.
+
+    You should have received a copy of the GNU Affero General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If your software can interact with users remotely through a computer
+network, you should also make sure that it provides a way for users to
+get its source.  For example, if your program is a web application, its
+interface could display a "Source" link that leads users to an archive
+of the code.  There are many ways you could offer source, and different
+solutions will be better for different programs; see section 13 for the
+specific requirements.
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU AGPL, see
+<https://www.gnu.org/licenses/>.
diff --git a/leb128.c b/leb128.c
new file mode 100644
index 0000000..c1584c5
--- /dev/null
+++ b/leb128.c
@@ -0,0 +1,165 @@
+/*
+ * nwc, a NanoWasm compiler
+ * Copyright (C) 2025 Xavier Del Campo Romero
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/*
+ * Adapted from:
+ *
+ * nanowasm, a tiny WebAssembly/Wasm interpreter
+ * Copyright (C) 2023-2024  Xavier Del Campo Romero
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/.
+ *
+ * Which, in turn, was adapted from the wac project:
+ * https://github.com/kanaka/wac
+ *
+ * Copyright (C) Joel Martin <github@martintribe.org>
+ * The wac project is licensed under the MPL 2.0 (Mozilla Public License
+ * 2.0). The text of the MPL 2.0 license is included below and can be
+ * found at https://www.mozilla.org/MPL/2.0/
+ */
+
+#include "types.h"
+#include <stdbool.h>
+#include <stdint.h>
+#include <stdio.h>
+
+static int read_leb128(FILE *const f, const unsigned maxbits, const bool sign,
+    unsigned long long *const out)
+{
+    uint8_t byte;
+    unsigned long long result = 0;
+    unsigned shift = 0, bcnt = 0;
+
+    for (;;)
+    {
+        if (!fread(&byte, sizeof byte, 1, f))
+        {
+            if (ferror(f))
+                fprintf(stderr, "%s: ferror\n", __func__);
+
+            return -1;
+        }
+
+        result |= (unsigned long long)(byte & 0x7f) << shift;
+        shift += 7;
+
+        if (!(byte & 0x80))
+            break;
+        else if (++bcnt > (maxbits + 7u - 1u) / 7u)
+        {
+            fprintf(stderr, "%s: overflow\n", __func__);
+            return -1;
+        }
+    }
+
+    if (sign && (shift < maxbits) && (byte & 0x40))
+        result |= -1ll << shift;
+
+    *out = result;
+    return 0;
+}
+
+int read_varint1(FILE *const f, varint1 *const out)
+{
+    unsigned long long res;
+
+    if (read_leb128(f, 1, true, &res))
+        return -1;
+
+    *out = res;
+    return 0;
+}
+
+int read_varint7(FILE *const f, varint7 *const out)
+{
+    unsigned long long res;
+
+    if (read_leb128(f, 7, true, &res))
+        return -1;
+
+    *out = res;
+    return 0;
+}
+
+int read_varint32(FILE *const f, varint32 *const out)
+{
+    unsigned long long res;
+
+    if (read_leb128(f, 32, true, &res))
+        return -1;
+
+    *out = res;
+    return 0;
+}
+
+int read_varint64(FILE *const f, varint64 *const out)
+{
+    unsigned long long res;
+
+    if (read_leb128(f, 64, true, &res))
+        return -1;
+
+    *out = res;
+    return 0;
+}
+
+int read_varuint1(FILE *const f, varuint1 *const out)
+{
+    unsigned long long res;
+
+    if (read_leb128(f, 1, false, &res))
+        return -1;
+
+    *out = res;
+    return 0;
+}
+
+int read_varuint7(FILE *const f, varuint7 *const out)
+{
+    unsigned long long res;
+
+    if (read_leb128(f, 7, false, &res))
+        return -1;
+
+    *out = res;
+    return 0;
+}
+
+int read_varuint32(FILE *const f, varuint32 *const out)
+{
+    unsigned long long res;
+
+    if (read_leb128(f, 32, false, &res))
+        return -1;
+
+    *out = res;
+    return 0;
+}
+
+int read_varuint64(FILE *const f, varuint64 *const out)
+{
+    unsigned long long res;
+
+    if (read_leb128(f, 64, false, &res))
+        return -1;
+
+    *out = res;
+    return 0;
+}
diff --git a/main.c b/main.c
new file mode 100644
index 0000000..440b665
--- /dev/null
+++ b/main.c
@@ -0,0 +1,895 @@
+/*
+ * wadb, a WebAssembly debugger
+ * Copyright (C) 2025 Xavier Del Campo Romero
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#define _POSIX_C_SOURCE 200809L
+
+#include <dwarf.h>
+#include <libdwarf/libdwarf.h>
+#include "types.h"
+#include <sys/socket.h>
+#include <netdb.h>
+#include <unistd.h>
+#include <errno.h>
+#include <limits.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+enum
+{
+    DEBUG_EMPTY,
+    DEBUG_ABBREV,
+    DEBUG_INFO,
+    DEBUG_STR,
+    DEBUG_ARANGES,
+    DEBUG_FRAME,
+    DEBUG_LINE,
+    DEBUG_LOC,
+    DEBUG_MACINFO,
+    DEBUG_PUBNAMES,
+    DEBUG_PUBTYPES,
+    DEBUG_RANGES,
+    DEBUG_TYPES,
+
+    NSECTIONS
+};
+
+struct dwarf
+{
+    FILE *f;
+
+    struct dwsection
+    {
+        long offset;
+        varuint32 len;
+        void *data;
+    } sections[NSECTIONS];
+};
+
+struct header
+{
+    Dwarf_Sig8 type_signature;
+    Dwarf_Unsigned cu_header_length, typeoffset, next_cu_header_offset;
+    Dwarf_Half version_stamp, address_size, length_size, extension_size,
+        header_cu_type;
+    Dwarf_Off abbrev_offset;
+};
+
+static const char *const names[NSECTIONS] =
+{
+    [DEBUG_EMPTY] = "",
+    [DEBUG_ABBREV] = ".debug_abbrev",
+    [DEBUG_ARANGES] = ".debug_aranges",
+    [DEBUG_FRAME] = ".debug_frame",
+    [DEBUG_INFO] = ".debug_info",
+    [DEBUG_LINE] = ".debug_line",
+    [DEBUG_LOC] = ".debug_loc",
+    [DEBUG_MACINFO] = ".debug_macinfo",
+    [DEBUG_PUBNAMES] = ".debug_pubnames",
+    [DEBUG_PUBTYPES] = ".debug_pubtypes",
+    [DEBUG_RANGES] = ".debug_ranges",
+    [DEBUG_STR] = ".debug_str",
+    [DEBUG_TYPES] = ".debug_types"
+};
+
+static void errcb(const Dwarf_Error e, const Dwarf_Ptr args)
+{
+}
+
+static int get_section_info(void *const obj, const Dwarf_Half section_index,
+    Dwarf_Obj_Access_Section *const return_section, int *const error)
+{
+    const struct dwarf *const dw = obj;
+
+    if (section_index >= sizeof dw->sections / sizeof *dw->sections)
+    {
+        fprintf(stderr, "%s: invalid section_index: %hd\n", __func__,
+            section_index);
+        return DW_DLV_ERROR;
+    }
+
+    const struct dwsection *const s = &dw->sections[section_index];
+
+    if (!names[section_index] && !s->len)
+        return DW_DLV_NO_ENTRY;
+
+    *return_section = (const Dwarf_Obj_Access_Section)
+    {
+        .size = s->len,
+        .addr = s->offset,
+        .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);
+}
+
+static Dwarf_Unsigned get_section_count(void *const obj)
+{
+    const struct dwarf *const dw = obj;
+    Dwarf_Unsigned ret = 0;
+
+    for (size_t i = 0; i < sizeof dw->sections / sizeof *dw->sections; i++)
+        if (dw->sections[i].offset)
+            ret++;
+
+    return ret;
+}
+
+static int load_section(void *const obj, const Dwarf_Half section_index,
+    Dwarf_Small **const return_data, int *const error)
+{
+    struct dwarf *const dw = obj;
+    FILE *const f = dw->f;
+    Dwarf_Small *p = NULL;
+
+    if (section_index >= NSECTIONS)
+    {
+        fprintf(stderr, "%s: invalid section_index %hd\n", __func__,
+            section_index);
+        goto failure;
+    }
+
+    struct dwsection *const s = &dw->sections[section_index];
+    const char *const name = names[section_index];
+
+    if (!s->offset)
+    {
+        fprintf(stderr, "%s: unavailable section: %s\n", __func__, name);
+        goto failure;
+    }
+    else if (!s->len)
+    {
+        fprintf(stderr, "%s: unexpected zero length for section: %s\n",
+            __func__, name);
+        goto failure;
+    }
+    else if (!(p = malloc(s->len)))
+    {
+        fprintf(stderr, "%s: malloc(3): %s\n", __func__, strerror(errno));
+        goto failure;
+    }
+    else if (fseek(f, s->offset, SEEK_SET))
+    {
+        fprintf(stderr, "%s: fseek(3): %s\n", __func__, strerror(errno));
+        goto failure;
+    }
+    else if (!fread(p, s->len, 1, f))
+    {
+        fprintf(stderr, "%s: fread(3) failed, feof=%d, ferror=%d\n", __func__,
+            feof(f), ferror(f));
+        goto failure;
+    }
+
+    s->data = p;
+    *return_data = p;
+    return DW_DLV_OK;
+
+failure:
+    free(p);
+    return DW_DLV_ERROR;
+}
+
+static int check_header(FILE *const f)
+{
+    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))
+    {
+        fprintf(stderr, "%s: fread(3) magic failed, feof=%d, ferror=%d\n",
+            __func__, feof(f), ferror(f));
+        return -1;
+    }
+    else if (memcmp(magic, "\0asm", sizeof magic))
+    {
+        fprintf(stderr, "%s: invalid magic number\n", __func__);
+        return -1;
+    }
+    else if (!fread(version, sizeof version, 1, f))
+    {
+        fprintf(stderr, "%s: fread(3) version failed, feof=%d, ferror=%d\n",
+            __func__, feof(f), ferror(f));
+        return -1;
+    }
+    else if (memcmp(version, exp, sizeof version))
+    {
+        fprintf(stderr, "%s: invalid version number\n", __func__);
+        return -1;
+    }
+
+    return 0;
+}
+
+static char *read_name(FILE *const f)
+{
+    varuint32 name_len;
+    char *name = malloc(1);
+
+    if (!name)
+    {
+        fprintf(stderr, "%s: malloc(3): %s\n", __func__, strerror(errno));
+        goto failure;
+    }
+    else if (read_varuint32(f, &name_len))
+    {
+        fprintf(stderr, "%s: read_varuint32 failed\n", __func__);
+        goto failure;
+    }
+
+    for (varuint32 i = 0; i < name_len; i++)
+    {
+        uint8_t c;
+        const size_t r = fread(&c, sizeof c, 1, f);
+
+        if (!r)
+        {
+            fprintf(stderr, "%s: fread(3) failed, ferror(3)=%d, feof(3)=%d\n",
+                __func__, ferror(f), feof(f));
+            goto failure;
+        }
+
+        char *const newname = realloc(name, i + 2);
+
+        if (!newname)
+        {
+            fprintf(stderr, "%s: realloc(3): %s\n", __func__, strerror(errno));
+            goto failure;
+        }
+
+        name = newname;
+        name[i] = c;
+    }
+
+    name[name_len] = '\0';
+    return name;
+
+failure:
+    free(name);
+    return NULL;
+}
+
+struct section
+{
+    varuint7 code;
+    varuint32 len;
+    char *name;
+};
+
+static int parse_header(FILE *const f, struct section *const s)
+{
+    varuint7 code;
+    varuint32 payload_len;
+    char *name = NULL;
+    long before, after;
+
+    if (read_varuint7(f, &code))
+    {
+        /* Exceptionally, this might not be a fatal error. */
+        if (!feof(f))
+            fprintf(stderr, "%s: read_varuint7 failed\n", __func__);
+
+        goto failure;
+    }
+    else if (read_varuint32(f, &payload_len))
+    {
+        fprintf(stderr, "%s: read_varuint32 failed\n", __func__);
+        goto failure;
+    }
+    else if ((before = ftell(f)) < 0)
+    {
+        fprintf(stderr, "%s: ftell(3) before: %s\n", __func__, strerror(errno));
+        goto failure;
+    }
+    else if (!code && !(name = read_name(f)))
+    {
+        fprintf(stderr, "%s: read_name failed\n", __func__);
+        goto failure;
+    }
+    else if ((after = ftell(f)) < 0)
+    {
+        fprintf(stderr, "%s: ftell(3) after: %s\n", __func__, strerror(errno));
+        goto failure;
+    }
+
+    const unsigned long sz = after - before;
+
+    if (payload_len < sz)
+    {
+        fprintf(stderr, "%s: expected payload_len >= %lu, got %lu\n",
+            __func__, sz, (unsigned long)payload_len);
+        goto failure;
+    }
+
+    payload_len -= sz;
+
+    *s = (const struct section)
+    {
+        .code = code,
+        .len = payload_len,
+        .name = name
+    };
+
+    return 0;
+
+failure:
+    free(name);
+    return -1;
+}
+
+static int skip(FILE *const f, const struct section *const s)
+{
+    const int ret = fseek(f, s->len, SEEK_CUR);
+
+    if (ret)
+        fprintf(stderr, "%s: fseek(3): %s\n", __func__, strerror(errno));
+
+    return ret;
+}
+
+static struct dwsection *getdws(struct dwarf *const dw,
+    const char *const name)
+{
+    for (size_t i = 0; i < sizeof names / sizeof *names; i++)
+        if (!strcmp(name, names[i]))
+            return &dw->sections[i];
+
+    return NULL;
+}
+
+static int read_section(FILE *const f, struct dwarf *const dw)
+{
+    int ret = -1;
+    struct section s = {0};
+    struct dwsection *dws;
+    long offset;
+
+    if (parse_header(f, &s))
+    {
+        /* Exceptionally, this might not be a fatal error. */
+        if (!feof(f))
+            fprintf(stderr, "%s: parse_header failed\n", __func__);
+
+        goto end;
+    }
+    else if (s.code != SECTION_CUSTOM || !(dws = getdws(dw, s.name)))
+    {
+        if (skip(f, &s))
+        {
+            fprintf(stderr, "%s: skip failed\n", __func__);
+            goto end;
+        }
+    }
+    else if ((offset = ftell(f)) < 0)
+    {
+        fprintf(stderr, "%s: ftell(3): %s\n", __func__, strerror(errno));
+        goto end;
+    }
+    else
+    {
+        *dws = (const struct dwsection)
+        {
+            .len = s.len,
+            .offset = offset
+        };
+
+        if (skip(f, &s))
+        {
+            fprintf(stderr, "%s: skip failed\n", __func__);
+            goto end;
+        }
+    }
+
+    ret = 0;
+
+end:
+    free(s.name);
+    return ret;
+}
+
+static int parse(struct dwarf *const dw)
+{
+    FILE *const f = dw->f;
+
+    if (check_header(f))
+    {
+        fprintf(stderr, "%s: check_magic failed\n", __func__);
+        return -1;
+    }
+
+    for (;;)
+        if (read_section(f, dw))
+        {
+            if (feof(f))
+                break;
+
+            fprintf(stderr, "%s: read_section failed\n", __func__);
+            return -1;
+        }
+
+    return 0;
+}
+
+static bool
+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;
+}
+
+static int read_attr(const Dwarf_Attribute a, const unsigned level,
+    Dwarf_Error *const e)
+{
+    Dwarf_Half num, form;
+    const char *atname, *fname;
+    char *s = NULL;
+    int res = dwarf_whatattr(a, &num, e);
+
+    if (res)
+    {
+        fprintf(stderr, "%s: dwarf_whatattr failed with %d\n", __func__, res);
+        return -1;
+    }
+    else if ((res = dwarf_whatform(a, &form, e)))
+    {
+        fprintf(stderr, "%s: dwarf_whatform failed with %d\n", __func__, res);
+        return -1;
+    }
+    else if ((res = dwarf_get_AT_name(num, &atname)))
+    {
+        fprintf(stderr, "%s: dwarf_get_AT_name failed with %d\n", __func__,
+            res);
+        return -1;
+    }
+    else if ((res = dwarf_get_FORM_name(form, &fname)))
+    {
+        fprintf(stderr, "%s: dwarf_get_FORM_name failed with %d\n", __func__,
+            res);
+        return -1;
+    }
+    else if (isformstring(form) && (res = dwarf_formstring(a, &s, e)))
+    {
+        fprintf(stderr, "%s: dwarf_formstring failed with %d\n", __func__, res);
+        return -1;
+    }
+
+#if 0
+    for (unsigned i = 0; i < level; i++)
+        putchar('\t');
+
+    printf("atname=%s, fname=%s", atname, fname);
+
+    if (s)
+        printf(", s=%s", s);
+
+    putchar('\n');
+#endif
+
+    return 0;
+}
+
+static int print_die(const Dwarf_Debug dbg, const Dwarf_Die die,
+    const unsigned level, Dwarf_Error *const e)
+{
+    Dwarf_Half tag;
+    Dwarf_Attribute *attrs = NULL;
+    Dwarf_Signed nattr = 0;
+    const char *name;
+    int ret = -1, r = dwarf_tag(die, &tag, e);
+
+    if (r)
+    {
+        fprintf(stderr, "%s: dwarf_tag failed with %d\n", __func__, r);
+        goto end;
+    }
+    else if ((r = dwarf_get_TAG_name(tag, &name)))
+        name = "<bogus tag>";
+
+    if ((r = dwarf_attrlist(die, &attrs, &nattr, e)))
+    {
+        fprintf(stderr, "%s: dwarf_attrlist failed with %d\n", __func__, r);
+        goto end;
+    }
+
+    for (Dwarf_Signed i = 0; i < nattr; i++)
+        if (read_attr(attrs[i], level, e))
+        {
+            fprintf(stderr, "%s: failed to read attribute %lld\n", __func__, i);
+            goto end;
+        }
+
+    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;
+}
+
+static int read_children(const Dwarf_Debug dbg, const Dwarf_Die die,
+    const unsigned level, Dwarf_Error *const e)
+{
+    int ret = -1;
+    Dwarf_Die child;
+    int r;
+
+    if (print_die(dbg, die, level, e))
+    {
+        fprintf(stderr, "%s: failed to print die\n", __func__);
+        return -1;
+    }
+    else if (!(r = dwarf_child(die, &child, e)))
+    {
+        ret = read_children(dbg, child, level + 1, e);
+        dwarf_dealloc_die(child);
+        return ret;
+    }
+    else if (r == DW_DLV_ERROR)
+    {
+        fprintf(stderr, "%s: dwarf_child failed\n", __func__);
+        return -1;
+    }
+
+    Dwarf_Die d = die;
+
+    for (;;)
+    {
+        Dwarf_Die sibling;
+
+        if (!(r = dwarf_siblingof(dbg, d, &sibling, e)))
+        {
+            ret = read_children(dbg, sibling, level, e);
+
+            if (ret)
+                return ret;
+        }
+        else if (r == DW_DLV_ERROR)
+        {
+            fprintf(stderr, "%s: dwarf_siblingof failed\n", __func__);
+            return -1;
+        }
+        else if (r == DW_DLV_NO_ENTRY)
+            break;
+
+        d = sibling;
+    }
+
+    return 0;
+}
+
+static int read_header(const Dwarf_Debug dbg, struct header *const h,
+    Dwarf_Error *const e)
+{
+    Dwarf_Die die = 0;
+    int ret = -1, 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);
+
+    if (r != DW_DLV_OK)
+    {
+        fprintf(stderr, "%s: dwarf_next_cu_header_d failed with %d\n",
+            __func__, r);
+        return -1;
+    }
+    else if ((r = dwarf_siblingof(dbg, NULL, &die, e)))
+    {
+        fprintf(stderr, "%s: dwarf_siblingof failed with %d\n", __func__, r);
+        goto end;
+    }
+    else if (read_children(dbg, die, 0, e))
+    {
+        fprintf(stderr, "%s: failed to read children\n", __func__);
+        goto end;
+    }
+
+    ret = 0;
+
+end:
+    dwarf_dealloc_die(die);
+    return ret;
+}
+
+static int init_client(const char *const tgt)
+{
+    int ret = -1, fd = -1;
+    char *hostdup = NULL, *portdup = NULL;
+    const char *sep = strchr(tgt, ':'), *host, *port;
+    struct addrinfo *pai = NULL;
+    unsigned long portv;
+
+    if (!sep)
+    {
+        host = tgt;
+        port = "3333";
+    }
+    else
+    {
+        if (!*(sep + 1))
+        {
+            fprintf(stderr, "%s: missing port number\n", __func__);
+            goto end;
+        }
+        else if (sep == tgt)
+            host = "localhost";
+        else if (!(hostdup = strndup(tgt, sep - tgt)))
+        {
+            perror("strndup(3)");
+            goto end;
+        }
+        else
+            host = hostdup;
+
+        if (!(portdup = strdup(sep + 1)))
+        {
+            fprintf(stderr, "%s: failed to duplicate string: %s\n", __func__,
+                strerror(errno));
+            goto end;
+        }
+        else
+            port = portdup;
+    }
+
+    char *end;
+    int error;
+    const struct addrinfo ai =
+    {
+        .ai_family = AF_INET,
+        .ai_socktype = SOCK_STREAM
+    };
+
+    errno = 0;
+    portv = strtoul(port, &end, 10);
+
+    if (errno || *end || portv > USHRT_MAX)
+    {
+        fprintf(stderr, "%s: invalid port number: %s\n", __func__, port);
+        goto end;
+    }
+    else if ((error = getaddrinfo(host, port, &ai, &pai)))
+    {
+        fprintf(stderr, "%s: getaddrinfo(3) %s:%s: %s\n", __func__,
+            host, port, gai_strerror(error));
+        goto end;
+    }
+
+    for (const struct addrinfo *a = pai; a; a = a->ai_next)
+    {
+        if ((fd = socket(a->ai_family, a->ai_socktype, a->ai_protocol)) < 0)
+        {
+            perror("socket(2)");
+            continue;
+        }
+        else if (connect(fd, a->ai_addr, a->ai_addrlen))
+        {
+            fprintf(stderr, "%s: connect(2) %s:%s: %s\n", __func__,
+                host, port, strerror(errno));
+            goto end;
+        }
+
+        break;
+    }
+
+    ret = fd;
+
+end:
+
+    if (ret < 0 && fd >= 0 && close(fd))
+        perror("close(2)");
+
+    if (pai)
+        freeaddrinfo(pai);
+
+    free(hostdup);
+    free(portdup);
+    return ret;
+}
+
+struct verb
+{
+    const char *verb;
+    int (*f)(void);
+};
+
+static int help(void);
+
+static const struct verb verbs[] =
+{
+    {"?", help},
+    {"help", help}
+};
+
+static int help(void)
+{
+    return -1;
+}
+
+static int process(const char *const l)
+{
+    return 0;
+}
+
+static int run(const int fd)
+{
+    int ret = -1;
+    char *l;
+    size_t n = 0;
+    ssize_t r;
+
+    printf("(wadb) ");
+    fflush(stdout);
+
+    if ((r = getline(&l, &n, stdin) < 0))
+    {
+        if (feof(stdin))
+        {
+            putchar('\n');
+            return 1;
+        }
+        else
+            perror("getline(3)");
+
+        goto end;
+    }
+
+    *strchr(l, '\n') = '\0';
+
+    if (process(l))
+        goto end;
+
+    ret = 0;
+
+end:
+    free(l);
+    return ret;
+}
+
+int main(int argc, char *argv[])
+{
+    static const Dwarf_Obj_Access_Methods methods =
+    {
+        .get_section_info = get_section_info,
+        .get_byte_order = get_byte_order,
+        .get_length_size = get_length_size,
+        .get_pointer_size = get_pointer_size,
+        .get_section_count = get_section_count,
+        .load_section = load_section
+    };
+
+    int ret = EXIT_FAILURE, result, fd = -1;
+    struct dwarf dw = {0};
+    Dwarf_Obj_Access_Interface aitf = {.object = &dw, .methods = &methods};
+    Dwarf_Debug dbg = 0;
+    Dwarf_Error error = 0;
+    struct header h;
+
+    if (argc < 2)
+    {
+        fprintf(stderr, "%s [-h <host:port>] <wasm-file> [args ...]\n", *argv);
+        goto end;
+    }
+
+    const char *hostport = "localhost:3333";
+    int opt;
+
+    while ((opt = getopt(argc, argv, "h:")) != -1)
+        switch (opt)
+        {
+            case 'h':
+                hostport = optarg;
+                break;
+        }
+
+    const char *const path = argv[optind];
+
+    if (!(dw.f = fopen(path, "rb")))
+    {
+        fprintf(stderr, "fopen(3) %s: %s\n", path, strerror(errno));
+        goto end;
+    }
+    else if (parse(&dw))
+    {
+        fprintf(stderr, "failed to parse %s\n", path);
+        goto end;
+    }
+    else if ((result = dwarf_object_init(&aitf, errcb, &dw, &dbg, &error))
+        != DW_DLV_OK)
+    {
+        fprintf(stderr, "dwarf_object_init failed with %d: %s\n", result,
+            dwarf_errmsg(error));
+        goto end;
+    }
+    else if (read_header(dbg, &h, &error))
+    {
+        fprintf(stderr, "failed to read header\n");
+        goto end;
+    }
+    else if ((fd = init_client(hostport)) < 0)
+    {
+        fprintf(stderr, "failed to init client\n");
+        goto end;
+    }
+
+    while (!(result = run(fd)))
+        ;
+
+    if (result < 0)
+        goto end;
+
+    ret = EXIT_SUCCESS;
+
+end:
+
+    if (fd >= 0 && close(fd))
+    {
+        perror("close(2)");
+        ret = EXIT_FAILURE;
+    }
+
+    for (size_t i = 0; i < sizeof dw.sections / sizeof *dw.sections; i++)
+        free(dw.sections[i].data);
+
+    if (dbg && dwarf_object_finish(dbg, &error))
+    {
+        fprintf(stderr, "dwarf_object_finish: %s\n", dwarf_errmsg(error));
+        ret = EXIT_FAILURE;
+    }
+
+    if (dw.f && fclose(dw.f))
+    {
+        fprintf(stderr, "fclose(3) %s: %s\n", path, strerror(errno));
+        ret = EXIT_FAILURE;
+    }
+
+    return ret;
+}
diff --git a/types.h b/types.h
new file mode 100644
index 0000000..7b5ec0c
--- /dev/null
+++ b/types.h
@@ -0,0 +1,64 @@
+/*
+ * wadb, a WebAssembly debugger
+ * Copyright (C) 2025 Xavier Del Campo Romero
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef TYPES_H
+#define TYPES_H
+
+#include <stdbool.h>
+#include <stddef.h>
+#include <stdint.h>
+#include <stdio.h>
+
+enum
+{
+    SECTION_CUSTOM,
+    SECTION_TYPE,
+    SECTION_IMPORT,
+    SECTION_FUNCTION,
+    SECTION_TABLE,
+    SECTION_MEMORY,
+    SECTION_GLOBAL,
+    SECTION_EXPORT,
+    SECTION_START,
+    SECTION_ELEMENT,
+    SECTION_CODE,
+    SECTION_DATA
+};
+
+typedef bool varint1;
+typedef bool varuint1;
+typedef signed char varint7;
+typedef short varint16;
+typedef long varint32;
+typedef long long varint64;
+typedef unsigned char varuint7;
+typedef unsigned short varuint16;
+typedef unsigned long varuint32;
+typedef unsigned long long varuint64;
+typedef varint7 value_type;
+
+int read_varint1(FILE *f, varint1 *out);
+int read_varint7(FILE *f, varint7 *out);
+int read_varint32(FILE *f, varint32 *out);
+int read_varint64(FILE *f, varint64 *out);
+int read_varuint1(FILE *f, varuint1 *out);
+int read_varuint7(FILE *f, varuint7 *out);
+int read_varuint32(FILE *f, varuint32 *out);
+int read_varuint64(FILE *f, varuint64 *out);
+
+#endif