First commitHEADmaster

13 files changed, 4365 insertions, 0 deletions

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..2620041
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,75 @@
+# This file is used to ignore files which are generated
+# ----------------------------------------------------------------------------
+
+*~
+*.autosave
+*.a
+*.core
+*.moc
+*.o
+*.obj
+*.orig
+*.rej
+*.so
+*.so.*
+*_pch.h.cpp
+*_resource.rc
+*.qm
+.#*
+*.*#
+core
+!core/
+tags
+.DS_Store
+.directory
+*.debug
+Makefile*
+*.prl
+*.app
+moc_*.cpp
+ui_*.h
+qrc_*.cpp
+Thumbs.db
+*.res
+*.rc
+/.qmake.cache
+/.qmake.stash
+
+# qtcreator generated files
+*.pro.user*
+CMakeLists.txt.user*
+
+# xemacs temporary files
+*.flc
+
+# Vim temporary files
+.*.swp
+
+# Visual Studio generated files
+*.ib_pdb_index
+*.idb
+*.ilk
+*.pdb
+*.sln
+*.suo
+*.vcproj
+*vcproj.*.*.user
+*.ncb
+*.sdf
+*.opensdf
+*.vcxproj
+*vcxproj.*
+
+# MinGW generated files
+*.Debug
+*.Release
+
+# Python byte code
+*.pyc
+
+# Binaries
+# --------
+*.dll
+*.exe
+
+/build*/
diff --git a/CMakeLists.txt b/CMakeLists.txt
new file mode 100644
index 0000000..192044e
--- /dev/null
+++ b/CMakeLists.txt
@@ -0,0 +1,82 @@
+cmake_minimum_required(VERSION 3.13)
+
+project(qwadb VERSION 0.1 LANGUAGES C CXX)
+
+add_compile_options(-fdata-sections -ffunction-sections)
+
+set(QT_VERSION_MAJOR 5)
+set(CMAKE_INCLUDE_CURRENT_DIR ON)
+
+set(CMAKE_AUTOUIC ON)
+set(CMAKE_AUTOMOC ON)
+set(CMAKE_AUTORCC ON)
+
+set(CMAKE_CXX_STANDARD 11)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+
+find_package(QT NAMES Qt6 Qt5 COMPONENTS
+    Concurrent
+    Network
+    Widgets
+REQUIRED)
+
+find_package(Qt${QT_VERSION_MAJOR} COMPONENTS
+    Concurrent
+    Network
+    Widgets
+    REQUIRED
+)
+
+set(PROJECT_SOURCES
+    instr.cpp
+    leb128.c
+    main.cpp
+    qwadb.cpp
+    qwadb.ui
+    wasm.cpp
+)
+
+if(${QT_VERSION_MAJOR} GREATER_EQUAL 6)
+    qt_add_executable(${PROJECT_NAME}
+        MANUAL_FINALIZATION
+        ${PROJECT_SOURCES}
+    )
+# Define target properties for Android with Qt 6 as:
+#    set_property(TARGET ${PROJECT_NAME} APPEND PROPERTY QT_ANDROID_PACKAGE_SOURCE_DIR
+#                 ${CMAKE_CURRENT_SOURCE_DIR}/android)
+# For more information, see https://doc.qt.io/qt-6/qt-add-executable.html#target-creation
+else()
+    if(ANDROID)
+        add_library(${PROJECT_NAME} SHARED
+            ${PROJECT_SOURCES}
+        )
+# Define properties for Android with Qt 5 after find_package() calls as:
+#    set(ANDROID_PACKAGE_SOURCE_DIR "${CMAKE_CURRENT_SOURCE_DIR}/android")
+    else()
+        add_executable(${PROJECT_NAME}
+            ${PROJECT_SOURCES}
+        )
+    endif()
+endif()
+
+target_link_libraries(${PROJECT_NAME} PRIVATE
+    Qt${QT_VERSION_MAJOR}::Concurrent
+    Qt${QT_VERSION_MAJOR}::Network
+    Qt${QT_VERSION_MAJOR}::Widgets)
+
+target_link_options(${PROJECT_NAME} PRIVATE -Wl,--gc-sections)
+
+set_target_properties(${PROJECT_NAME} PROPERTIES
+    MACOSX_BUNDLE_GUI_IDENTIFIER my.example.com
+    MACOSX_BUNDLE_BUNDLE_VERSION ${PROJECT_VERSION}
+    MACOSX_BUNDLE_SHORT_VERSION_STRING ${PROJECT_VERSION_MAJOR}.${PROJECT_VERSION_MINOR}
+    MACOSX_BUNDLE TRUE
+    WIN32_EXECUTABLE TRUE
+)
+
+if(QT_VERSION_MAJOR EQUAL 6)
+    qt_finalize_executable(${PROJECT_NAME})
+endif()
+
+target_compile_options(${PROJECT_NAME} PUBLIC -Wall)
+target_link_libraries(${PROJECT_NAME} PRIVATE dwarf)
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
+
+  The GNU Affero General Public License is a free, copyleft license for
+software and other kinds of works, specifically designed to ensure
+cooperation with the community in the case of network server software.
+
+  The licenses for most software and other practical works are designed
+to take away your freedom to share and change the works.  By contrast,
+our General Public Licenses are intended to guarantee your freedom to
+share and change all versions of a program--to make sure it remains free
+software for all its users.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+them if you wish), that you receive source code or can get it if you
+want it, that you can change the software or use pieces of it in new
+free programs, and that you know you can do these things.
+
+  Developers that use our General Public Licenses protect your rights
+with two steps: (1) assert copyright on the software, and (2) offer
+you this License which gives you legal permission to copy, distribute
+and/or modify the software.
+
+  A secondary benefit of defending all users' freedom is that
+improvements made in alternate versions of the program, if they
+receive widespread use, become available for other developers to
+incorporate.  Many developers of free software are heartened and
+encouraged by the resulting cooperation.  However, in the case of
+software used on network servers, this result may fail to come about.
+The GNU General Public License permits making a modified version and
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+source code to the public.
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+  The GNU Affero General Public License is designed specifically to
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+users of that server.  Therefore, public use of a modified version, on
+a publicly accessible server, gives the public access to the source
+code of the modified version.
+
+  An older license, called the Affero General Public License and
+published by Affero, was designed to accomplish similar goals.  This is
+a different license, not a version of the Affero GPL, but Affero has
+released a new version of the Affero GPL which permits relicensing under
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+  The precise terms and conditions for copying, distribution and
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+
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+11 of the WIPO copyright treaty adopted on 20 December 1996, or
+similar laws prohibiting or restricting circumvention of such
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+  You may convey verbatim copies of the Program's source code as you
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+consistent with the requirements of this License, to extend the patent
+license to downstream recipients.  "Knowingly relying" means you have
+actual knowledge that, but for the patent license, your conveying the
+covered work in a country, or your recipient's use of the covered work
+in a country, would infringe one or more identifiable patents in that
+country that you have reason to believe are valid.
+
+  If, pursuant to or in connection with a single transaction or
+arrangement, you convey, or propagate by procuring conveyance of, a
+covered work, and grant a patent license to some of the parties
+receiving the covered work authorizing them to use, propagate, modify
+or convey a specific copy of the covered work, then the patent license
+you grant is automatically extended to all recipients of the covered
+work and works based on it.
+
+  A patent license is "discriminatory" if it does not include within
+the scope of its coverage, prohibits the exercise of, or is
+conditioned on the non-exercise of one or more of the rights that are
+specifically granted under this License.  You may not convey a covered
+work if you are a party to an arrangement with a third party that is
+in the business of distributing software, under which you make payment
+to the third party based on the extent of your activity of conveying
+the work, and under which the third party grants, to any of the
+parties who would receive the covered work from you, a discriminatory
+patent license (a) in connection with copies of the covered work
+conveyed by you (or copies made from those copies), or (b) primarily
+for and in connection with specific products or compilations that
+contain the covered work, unless you entered into that arrangement,
+or that patent license was granted, prior to 28 March 2007.
+
+  Nothing in this License shall be construed as excluding or limiting
+any implied license or other defenses to infringement that may
+otherwise be available to you under applicable patent law.
+
+  12. No Surrender of Others' Freedom.
+
+  If conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
+excuse you from the conditions of this License.  If you cannot convey a
+covered work so as to satisfy simultaneously your obligations under this
+License and any other pertinent obligations, then as a consequence you may
+not convey it at all.  For example, if you agree to terms that obligate you
+to collect a royalty for further conveying from those to whom you convey
+the Program, the only way you could satisfy both those terms and this
+License would be to refrain entirely from conveying the Program.
+
+  13. Remote Network Interaction; Use with the GNU General Public License.
+
+  Notwithstanding any other provision of this License, if you modify the
+Program, your modified version must prominently offer all users
+interacting with it remotely through a computer network (if your version
+supports such interaction) an opportunity to receive the Corresponding
+Source of your version by providing access to the Corresponding Source
+from a network server at no charge, through some standard or customary
+means of facilitating copying of software.  This Corresponding Source
+shall include the Corresponding Source for any work covered by version 3
+of the GNU General Public License that is incorporated pursuant to the
+following paragraph.
+
+  Notwithstanding any other provision of this License, you have
+permission to link or combine any covered work with a work licensed
+under version 3 of the GNU General Public License into a single
+combined work, and to convey the resulting work.  The terms of this
+License will continue to apply to the part which is the covered work,
+but the work with which it is combined will remain governed by version
+3 of the GNU General Public License.
+
+  14. Revised Versions of this License.
+
+  The Free Software Foundation may publish revised and/or new versions of
+the GNU Affero General Public License from time to time.  Such new versions
+will be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+  Each version is given a distinguishing version number.  If the
+Program specifies that a certain numbered version of the GNU Affero General
+Public License "or any later version" applies to it, you have the
+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation.  If the Program does not specify a version number of the
+GNU Affero General Public License, you may choose any version ever published
+by the Free Software Foundation.
+
+  If the Program specifies that a proxy can decide which future
+versions of the GNU Affero General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  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/instr.cpp b/instr.cpp
new file mode 100644
index 0000000..db4f79b
--- /dev/null
+++ b/instr.cpp
@@ -0,0 +1,623 @@
+#include "instr.h"
+#include <QString>
+#include <QVector>
+#include <stdio.h>
+
+static int imm_none(FILE *const f, QString &instr)
+{
+    return 0;
+}
+
+static int instr_sig(FILE *const f, QString &instr)
+{
+    varint7 sig;
+
+    if (read_varint7(f, &sig))
+        return -1;
+
+    instr = QString::number(sig);
+    return 0;
+}
+
+static int imm_readvaruint1(FILE *const f, QString &instr)
+{
+    varuint1 v;
+
+    if (read_varuint1(f, &v))
+        return -1;
+
+    instr = QString::number(v);
+    return 0;
+}
+
+static int imm_varuint32(FILE *const f, QString &instr)
+{
+    varuint32 v;
+
+    if (read_varuint32(f, &v))
+        return -1;
+
+    instr = QString::number(v);
+    return 0;
+}
+
+static int imm_varint32(FILE *const f, QString &instr)
+{
+    varint32 v;
+
+    if (read_varint32(f, &v))
+        return -1;
+
+    instr = QString::number(v);
+    return 0;
+}
+
+static int imm_varint64(FILE *const f, QString &instr)
+{
+    varint64 v;
+
+    if (read_varint64(f, &v))
+        return -1;
+
+    instr = QString::number(v);
+    return 0;
+}
+
+static int imm_memory(FILE *const f, QString &instr)
+{
+    varuint32 flags, offset;
+
+    if (read_varuint32(f, &flags)
+        || read_varuint32(f, &offset))
+        return -1;
+
+    instr = "flags=0x" + QString::number(flags, 16)
+        + ", offset=0x" + QString::number(offset, 16);
+    return 0;
+}
+
+static int imm_uint32(FILE *const f, QString &instr)
+{
+    uint32_t v;
+
+    if (!fread(&v, sizeof v, 1, f))
+        return -1;
+
+    instr = QString::number(v);
+    return 0;
+}
+
+static int imm_uint64(FILE *const f, QString &instr)
+{
+    uint64_t v;
+
+    if (!fread(&v, sizeof v, 1, f))
+        return -1;
+
+    instr = QString::number(v);
+    return 0;
+}
+
+static int imm_table(FILE *const f, QString &instr)
+{
+    varuint32 table_count;
+
+    if (read_varuint32(f, &table_count))
+    {
+        fprintf(stderr, "%s: read_varuint32 failed\n", __func__);
+        return -1;
+    }
+
+    instr = "count=" + QString::number(table_count) + ": [";
+
+    for (varuint32 i = 0; i < table_count; i++)
+    {
+        varuint32 v;
+
+        if (read_varuint32(f, &v))
+        {
+            fprintf(stderr, "%s: read_varuint32 %lu failed\n", __func__,
+                (unsigned long)i);
+            return -1;
+        }
+
+        instr += QString::number(v);
+
+        if (i + 1 < table_count)
+            instr += ", ";
+    }
+
+    varuint32 default_target;
+
+    instr += "], default_target=";
+
+    if (read_varuint32(f, &default_target))
+    {
+        fprintf(stderr, "%s: read_varuint32 failed\n", __func__);
+        return -1;
+    }
+
+    instr += QString::number(default_target);
+    return 0;
+}
+
+static int imm_call_indirect(FILE *const f, QString &instr)
+{
+    varuint32 type_index, reserved;
+
+    if (read_varuint32(f, &type_index))
+    {
+        fprintf(stderr, "%s: read_varuint32 failed\n", __func__);
+        return -1;
+    }
+    else if (read_varuint32(f, &reserved))
+    {
+        fprintf(stderr, "%s: read_varuint1 failed\n", __func__);
+        return -1;
+    }
+    else if (reserved)
+    {
+        fprintf(stderr, "%s: expected zero for reserved field\n", __func__);
+        return -1;
+    }
+
+    instr = QString::number(type_index);
+    return 0;
+}
+
+static int imm_extra(FILE *const f, QString &instr)
+{
+    uint8_t v;
+
+    if (!fread(&v, sizeof v, 1, f))
+        return -1;
+
+    instr = QString::number(v);
+    return 0;
+}
+
+enum op
+{
+    OP_UNREACHABLE,
+    OP_NOP,
+    OP_BLOCK,
+    OP_LOOP,
+    OP_IF,
+    OP_ELSE,
+    OP_END = 0xb,
+    OP_BR,
+    OP_BR_IF,
+    OP_BR_TABLE,
+    OP_RETURN,
+    OP_CALL,
+    OP_CALL_INDIRECT,
+    OP_DROP = 0x1a,
+    OP_SELECT,
+    OP_GET_LOCAL = 0x20,
+    OP_SET_LOCAL,
+    OP_TEE_LOCAL,
+    OP_GET_GLOBAL,
+    OP_SET_GLOBAL,
+    OP_I32_LOAD = 0x28,
+    OP_I64_LOAD,
+    OP_F32_LOAD,
+    OP_F64_LOAD,
+    OP_I32_LOAD8_S,
+    OP_I32_LOAD8_U,
+    OP_I32_LOAD16_S,
+    OP_I32_LOAD16_U,
+    OP_I64_LOAD8_S,
+    OP_I64_LOAD8_U,
+    OP_I64_LOAD16_S,
+    OP_I64_LOAD16_U,
+    OP_I64_LOAD32_S,
+    OP_I64_LOAD32_U,
+    OP_I32_STORE,
+    OP_I64_STORE,
+    OP_F32_STORE,
+    OP_F64_STORE,
+    OP_I32_STORE8,
+    OP_I32_STORE16,
+    OP_I64_STORE8,
+    OP_I64_STORE16,
+    OP_I64_STORE32,
+    OP_CURRENT_MEMORY,
+    OP_GROW_MEMORY,
+    OP_I32_CONST,
+    OP_I64_CONST,
+    OP_F32_CONST,
+    OP_F64_CONST,
+    OP_I32_EQZ,
+    OP_I32_EQ,
+    OP_I32_NE,
+    OP_I32_LT_S,
+    OP_I32_LT_U,
+    OP_I32_GT_S,
+    OP_I32_GT_U,
+    OP_I32_LE_S,
+    OP_I32_LE_U,
+    OP_I32_GE_S,
+    OP_I32_GE_U,
+    OP_I64_EQZ,
+    OP_I64_EQ,
+    OP_I64_NE,
+    OP_I64_LT_S,
+    OP_I64_LT_U,
+    OP_I64_GT_S,
+    OP_I64_GT_U,
+    OP_I64_LE_S,
+    OP_I64_LE_U,
+    OP_I64_GE_S,
+    OP_I64_GE_U,
+    OP_F32_EQ,
+    OP_F32_NE,
+    OP_F32_LT,
+    OP_F32_GT,
+    OP_F32_LE,
+    OP_F32_GE,
+    OP_F64_EQ,
+    OP_F64_NE,
+    OP_F64_LT,
+    OP_F64_GT,
+    OP_F64_LE,
+    OP_F64_GE,
+    OP_I32_CLZ,
+    OP_I32_CTZ,
+    OP_I32_POPCNT,
+    OP_I32_ADD,
+    OP_I32_SUB,
+    OP_I32_MUL,
+    OP_I32_DIV_S,
+    OP_I32_DIV_U,
+    OP_I32_REM_S,
+    OP_I32_REM_U,
+    OP_I32_AND,
+    OP_I32_OR,
+    OP_I32_XOR,
+    OP_I32_SHL,
+    OP_I32_SHR_S,
+    OP_I32_SHR_U,
+    OP_I32_ROTL,
+    OP_I32_ROTR,
+    OP_I64_CLZ,
+    OP_I64_CTZ,
+    OP_I64_POPCNT,
+    OP_I64_ADD,
+    OP_I64_SUB,
+    OP_I64_MUL,
+    OP_I64_DIV_S,
+    OP_I64_DIV_U,
+    OP_I64_REM_S,
+    OP_I64_REM_U,
+    OP_I64_AND,
+    OP_I64_OR,
+    OP_I64_XOR,
+    OP_I64_SHL,
+    OP_I64_SHR_S,
+    OP_I64_SHR_U,
+    OP_I64_ROTL,
+    OP_I64_ROTR,
+    OP_F32_ABS,
+    OP_F32_NEG,
+    OP_F32_CEIL,
+    OP_F32_FLOOR,
+    OP_F32_TRUNC,
+    OP_F32_NEAREST,
+    OP_F32_SQRT,
+    OP_F32_ADD,
+    OP_F32_SUB,
+    OP_F32_MUL,
+    OP_F32_DIV,
+    OP_F32_MIN,
+    OP_F32_MAX,
+    OP_F32_COPYSIGN,
+    OP_F64_ABS,
+    OP_F64_NEG,
+    OP_F64_CEIL,
+    OP_F64_FLOOR,
+    OP_F64_TRUNC,
+    OP_F64_NEAREST,
+    OP_F64_SQRT,
+    OP_F64_ADD,
+    OP_F64_SUB,
+    OP_F64_MUL,
+    OP_F64_DIV,
+    OP_F64_MIN,
+    OP_F64_MAX,
+    OP_F64_COPYSIGN,
+    OP_I32_WRAP_I64,
+    OP_I32_TRUNC_S_F32,
+    OP_I32_TRUNC_U_F32,
+    OP_I32_TRUNC_S_F64,
+    OP_I32_TRUNC_U_F64,
+    OP_I64_EXTEND_S_I32,
+    OP_I64_EXTEND_U_I32,
+    OP_I64_TRUNC_S_F32,
+    OP_I64_TRUNC_U_F32,
+    OP_I64_TRUNC_S_F64,
+    OP_I64_TRUNC_U_F64,
+    OP_F32_CONVERT_S_I32,
+    OP_F32_CONVERT_U_I32,
+    OP_F32_CONVERT_S_I64,
+    OP_F32_CONVERT_U_I64,
+    OP_F32_DEMOTE_F64,
+    OP_F64_CONVERT_S_I32,
+    OP_F64_CONVERT_U_I32,
+    OP_F64_CONVERT_S_I64,
+    OP_F64_CONVERT_U_I64,
+    OP_F64_PROMOTE_F32,
+    OP_I32_REINTERPRET_F32,
+    OP_I64_REINTERPRET_F64,
+    OP_F32_REINTERPRET_I32,
+    OP_F64_REINTERPRET_I64,
+    OP_EXTRA = 0xfc,
+};
+
+#define OPS \
+    X(OP_UNREACHABLE, "unreachable", imm_none) \
+    X(OP_NOP, "nop", imm_none) \
+    X(OP_BLOCK, "block", instr_sig) \
+    X(OP_LOOP, "loop", instr_sig) \
+    X(OP_IF, "if", instr_sig) \
+    X(OP_ELSE, "else", imm_none) \
+    X(OP_END, "end", imm_none) \
+    X(OP_BR, "br", imm_varuint32) \
+    X(OP_BR_IF, "br_if", imm_varuint32) \
+    X(OP_BR_TABLE, "br_table", imm_table) \
+    X(OP_RETURN, "return", imm_none) \
+    X(OP_CALL, "call", imm_varuint32) \
+    X(OP_CALL_INDIRECT, "call_indirect", imm_call_indirect) \
+    X(OP_DROP, "drop", imm_none) \
+    X(OP_SELECT, "select", imm_none) \
+    X(OP_GET_LOCAL, "get_local", imm_varuint32) \
+    X(OP_SET_LOCAL, "set_local", imm_varuint32) \
+    X(OP_TEE_LOCAL, "tee_local", imm_varuint32) \
+    X(OP_GET_GLOBAL, "get_global", imm_varuint32) \
+    X(OP_SET_GLOBAL, "set_global", imm_varuint32) \
+    X(OP_I32_LOAD, "i32_load", imm_memory) \
+    X(OP_I64_LOAD, "i64_load", imm_memory) \
+    X(OP_F32_LOAD, "f32_load", imm_memory) \
+    X(OP_F64_LOAD, "f64_load", imm_memory) \
+    X(OP_I32_LOAD8_S, "i32_load8_s", imm_memory) \
+    X(OP_I32_LOAD8_U, "i32_load8_u", imm_memory) \
+    X(OP_I32_LOAD16_S, "i32_load16_s", imm_memory) \
+    X(OP_I32_LOAD16_U, "i32_load16_u", imm_memory) \
+    X(OP_I64_LOAD8_S, "i64_load8_s", imm_memory) \
+    X(OP_I64_LOAD8_U, "i64_load8_u", imm_memory) \
+    X(OP_I64_LOAD16_S, "i64_load16_s", imm_memory) \
+    X(OP_I64_LOAD16_U, "i64_load16_u", imm_memory) \
+    X(OP_I64_LOAD32_S, "i64_load32_s", imm_memory) \
+    X(OP_I64_LOAD32_U, "i64_load32_u", imm_memory) \
+    X(OP_I32_STORE, "i32_store", imm_memory) \
+    X(OP_I64_STORE, "i64_store", imm_memory) \
+    X(OP_F32_STORE, "f32_store", imm_memory) \
+    X(OP_F64_STORE, "f64_store", imm_memory) \
+    X(OP_I32_STORE8, "i32_store8", imm_memory) \
+    X(OP_I32_STORE16, "i32_store16", imm_memory) \
+    X(OP_I64_STORE8, "i64_store8", imm_memory) \
+    X(OP_I64_STORE16, "i64_store16", imm_memory) \
+    X(OP_I64_STORE32, "i64_store32", imm_memory) \
+    X(OP_CURRENT_MEMORY, "current_memory", imm_readvaruint1) \
+    X(OP_GROW_MEMORY, "grow_memory", imm_readvaruint1) \
+    X(OP_I32_CONST, "i32_const", imm_varint32) \
+    X(OP_I64_CONST, "i64_const", imm_varint64) \
+    X(OP_F32_CONST, "f32_const", imm_uint32) \
+    X(OP_F64_CONST, "f64_const", imm_uint64) \
+    X(OP_I32_EQZ, "i32_eqz", imm_none) \
+    X(OP_I32_EQ, "i32_eq", imm_none) \
+    X(OP_I32_NE, "i32_ne", imm_none) \
+    X(OP_I32_LT_S, "i32_lt_s", imm_none) \
+    X(OP_I32_LT_U, "i32_lt_u", imm_none) \
+    X(OP_I32_GT_S, "i32_gt_s", imm_none) \
+    X(OP_I32_GT_U, "i32_gt_u", imm_none) \
+    X(OP_I32_LE_S, "i32_le_s", imm_none) \
+    X(OP_I32_LE_U, "i32_le_u", imm_none) \
+    X(OP_I32_GE_S, "i32_ge_s", imm_none) \
+    X(OP_I32_GE_U, "i32_ge_u", imm_none) \
+    X(OP_I64_EQZ, "i64_eqz", imm_none) \
+    X(OP_I64_EQ, "i64_eq", imm_none) \
+    X(OP_I64_NE, "i64_ne", imm_none) \
+    X(OP_I64_LT_S, "i64_lt_s", imm_none) \
+    X(OP_I64_LT_U, "i64_lt_u", imm_none) \
+    X(OP_I64_GT_S, "i64_gt_s", imm_none) \
+    X(OP_I64_GT_U, "i64_gt_u", imm_none) \
+    X(OP_I64_LE_S, "i64_le_s", imm_none) \
+    X(OP_I64_LE_U, "i64_le_u", imm_none) \
+    X(OP_I64_GE_S, "i64_ge_s", imm_none) \
+    X(OP_I64_GE_U, "i64_ge_u", imm_none) \
+    X(OP_F32_EQ, "f32_eq", imm_none) \
+    X(OP_F32_NE, "f32_ne", imm_none) \
+    X(OP_F32_LT, "f32_lt", imm_none) \
+    X(OP_F32_GT, "f32_gt", imm_none) \
+    X(OP_F32_LE, "f32_le", imm_none) \
+    X(OP_F32_GE, "f32_ge", imm_none) \
+    X(OP_F64_EQ, "f64_eq", imm_none) \
+    X(OP_F64_NE, "f64_ne", imm_none) \
+    X(OP_F64_LT, "f64_lt", imm_none) \
+    X(OP_F64_GT, "f64_gt", imm_none) \
+    X(OP_F64_LE, "f64_le", imm_none) \
+    X(OP_F64_GE, "f64_ge", imm_none) \
+    X(OP_I32_CLZ, "i32_clz", imm_none) \
+    X(OP_I32_CTZ, "i32_ctz", imm_none) \
+    X(OP_I32_POPCNT, "i32_popcnt", imm_none) \
+    X(OP_I32_ADD, "i32_add", imm_none) \
+    X(OP_I32_SUB, "i32_sub", imm_none) \
+    X(OP_I32_MUL, "i32_mul", imm_none) \
+    X(OP_I32_DIV_S, "i32_div_s", imm_none) \
+    X(OP_I32_DIV_U, "i32_div_u", imm_none) \
+    X(OP_I32_REM_S, "i32_rem_s", imm_none) \
+    X(OP_I32_REM_U, "i32_rem_u", imm_none) \
+    X(OP_I32_AND, "i32_and", imm_none) \
+    X(OP_I32_OR, "i32_or", imm_none) \
+    X(OP_I32_XOR, "i32_xor", imm_none) \
+    X(OP_I32_SHL, "i32_shl", imm_none) \
+    X(OP_I32_SHR_S, "i32_shr_s", imm_none) \
+    X(OP_I32_SHR_U, "i32_shr_u", imm_none) \
+    X(OP_I32_ROTL, "i32_rotl", imm_none) \
+    X(OP_I32_ROTR, "i32_rotr", imm_none) \
+    X(OP_I64_CLZ, "i64_clz", imm_none) \
+    X(OP_I64_CTZ, "i64_ctz", imm_none) \
+    X(OP_I64_POPCNT, "i64_popcnt", imm_none) \
+    X(OP_I64_ADD, "i64_add", imm_none) \
+    X(OP_I64_SUB, "i64_sub", imm_none) \
+    X(OP_I64_MUL, "i64_mul", imm_none) \
+    X(OP_I64_DIV_S, "i64_div_s", imm_none) \
+    X(OP_I64_DIV_U, "i64_div_u", imm_none) \
+    X(OP_I64_REM_S, "i64_rem_s", imm_none) \
+    X(OP_I64_REM_U, "i64_rem_u", imm_none) \
+    X(OP_I64_AND, "i64_and", imm_none) \
+    X(OP_I64_OR, "i64_or", imm_none) \
+    X(OP_I64_XOR, "i64_xor", imm_none) \
+    X(OP_I64_SHL, "i64_shl", imm_none) \
+    X(OP_I64_SHR_S, "i64_shr_s", imm_none) \
+    X(OP_I64_SHR_U, "i64_shr_u", imm_none) \
+    X(OP_I64_ROTL, "i64_rotl", imm_none) \
+    X(OP_I64_ROTR, "i64_rotr", imm_none) \
+    X(OP_F32_ABS, "f32_abs", imm_none) \
+    X(OP_F32_NEG, "f32_neg", imm_none) \
+    X(OP_F32_CEIL, "f32_ceil", imm_none) \
+    X(OP_F32_FLOOR, "f32_floor", imm_none) \
+    X(OP_F32_TRUNC, "f32_trunc", imm_none) \
+    X(OP_F32_NEAREST, "f32_nearest", imm_none) \
+    X(OP_F32_SQRT, "f32_sqrt", imm_none) \
+    X(OP_F32_ADD, "f32_add", imm_none) \
+    X(OP_F32_SUB, "f32_sub", imm_none) \
+    X(OP_F32_MUL, "f32_mul", imm_none) \
+    X(OP_F32_DIV, "f32_div", imm_none) \
+    X(OP_F32_MIN, "f32_min", imm_none) \
+    X(OP_F32_MAX, "f32_max", imm_none) \
+    X(OP_F32_COPYSIGN, "f32_copysign", imm_none) \
+    X(OP_F64_ABS, "f64_abs", imm_none) \
+    X(OP_F64_NEG, "f64_neg", imm_none) \
+    X(OP_F64_CEIL, "f64_ceil", imm_none) \
+    X(OP_F64_FLOOR, "f64_floor", imm_none) \
+    X(OP_F64_TRUNC, "f64_trunc", imm_none) \
+    X(OP_F64_NEAREST, "f64_nearest", imm_none) \
+    X(OP_F64_SQRT, "f64_sqrt", imm_none) \
+    X(OP_F64_ADD, "f64_add", imm_none) \
+    X(OP_F64_SUB, "f64_sub", imm_none) \
+    X(OP_F64_MUL, "f64_mul", imm_none) \
+    X(OP_F64_DIV, "f64_div", imm_none) \
+    X(OP_F64_MIN, "f64_min", imm_none) \
+    X(OP_F64_MAX, "f64_max", imm_none) \
+    X(OP_F64_COPYSIGN, "f64_copysign", imm_none) \
+    X(OP_I32_WRAP_I64, "i32_wrap_i64", imm_none) \
+    X(OP_I32_TRUNC_S_F32, "i32_trunc_s_f32", imm_none) \
+    X(OP_I32_TRUNC_U_F32, "i32_trunc_u_f32", imm_none) \
+    X(OP_I32_TRUNC_S_F64, "i32_trunc_s_f64", imm_none) \
+    X(OP_I32_TRUNC_U_F64, "i32_trunc_u_f64", imm_none) \
+    X(OP_I64_EXTEND_S_I32, "i64_extend_s_i32", imm_none) \
+    X(OP_I64_EXTEND_U_I32, "i64_extend_u_i32", imm_none) \
+    X(OP_I64_TRUNC_S_F32, "i64_trunc_s_f32", imm_none) \
+    X(OP_I64_TRUNC_U_F32, "i64_trunc_u_f32", imm_none) \
+    X(OP_I64_TRUNC_S_F64, "i64_trunc_s_f64", imm_none) \
+    X(OP_I64_TRUNC_U_F64, "i64_trunc_u_f64", imm_none) \
+    X(OP_F32_CONVERT_S_I32, "f32_convert_s_i32", imm_none) \
+    X(OP_F32_CONVERT_U_I32, "f32_convert_u_i32", imm_none) \
+    X(OP_F32_CONVERT_S_I64, "f32_convert_s_i64", imm_none) \
+    X(OP_F32_CONVERT_U_I64, "f32_convert_u_i64", imm_none) \
+    X(OP_F32_DEMOTE_F64, "f32_demote_f64", imm_none) \
+    X(OP_F64_CONVERT_S_I32, "f64_convert_s_i32", imm_none) \
+    X(OP_F64_CONVERT_U_I32, "f64_convert_u_i32", imm_none) \
+    X(OP_F64_CONVERT_S_I64, "f64_convert_s_i64", imm_none) \
+    X(OP_F64_CONVERT_U_I64, "f64_convert_u_i64", imm_none) \
+    X(OP_F64_PROMOTE_F32, "f64_promote_f32", imm_none) \
+    X(OP_I32_REINTERPRET_F32, "i32_reinterpret_f32", imm_none) \
+    X(OP_I64_REINTERPRET_F64, "i64_reinterpret_f64", imm_none) \
+    X(OP_F32_REINTERPRET_I32, "f32_reinterpret_i32", imm_none) \
+    X(OP_F64_REINTERPRET_I64, "f64_reinterpret_i64", imm_none) \
+    X(OP_EXTRA, "extra", imm_extra)
+
+
+struct opcode
+{
+    enum op op;
+    const char *s;
+    int (*read)(FILE *f, QString &);
+};
+
+static const opcode opcodes[] =
+{
+#define X(x, y, z) {x, y, z},
+    OPS
+#undef X
+};
+
+int WasmInstr::parse(FILE *const f, WasmInstr &i, QString &error,
+    bool *const end)
+{
+    quint8 opcode;
+    const long start = ftell(f);
+
+    if (start < 0)
+    {
+        error = QString("ftell(3) failed: ") + strerror(errno);
+        return -1;
+    }
+    else if (!fread(&opcode, sizeof opcode, 1, f))
+    {
+        error = "fread(3) failed, ferror(3)="
+            + QString::number(ferror(f)) + ", feof(3)="
+            + QString::number(feof(f));
+        return -1;
+    }
+
+    for (const auto &o : opcodes)
+        if (opcode == o.op)
+        {
+            QString imm;
+
+            if (o.read(f, imm))
+                return -1;
+            else if (end)
+                *end = opcode == OP_END;
+
+            i.instr = QString(o.s) + " " + imm;
+            i.address = start;
+            return 0;
+        }
+
+    error = "Unknown opcode at offset 0x" + QString::number(start, 16)
+        +": 0x" + QString::number(opcode, 16);
+    return -1;
+}
+
+int WasmInstr::parse(FILE *const f, varuint32 maxlen,
+    QVector<WasmInstr> &vinstr, QString &error)
+{
+    while (maxlen)
+    {
+        WasmInstr i;
+
+        const long start = ftell(f);
+
+        if (start < 0)
+        {
+            error = QString("ftell(3) failed: ") + strerror(errno);
+            return -1;
+        }
+        else if (parse(f, i, error))
+            return -1;
+
+        const long end = ftell(f);
+
+        if (end < 0)
+        {
+            error = QString("ftell(3) failed: ") + strerror(errno);
+            return -1;
+        }
+
+        const unsigned long consumed = end - start;
+
+        if (consumed > maxlen)
+        {
+            error = "Function body exceeds expected size";
+            return -1;
+        }
+
+        maxlen -= consumed;
+        vinstr.push_back(i);
+    }
+
+    return 0;
+}
diff --git a/instr.h b/instr.h
new file mode 100644
index 0000000..942e474
--- /dev/null
+++ b/instr.h
@@ -0,0 +1,24 @@
+#ifndef INSTR_H
+#define INSTR_H
+
+#include "types.h"
+#include <QString>
+#include <stdio.h>
+
+struct WasmInstr
+{
+    quint32 address;
+    QString instr;
+
+    static int parse(FILE *f, WasmInstr &instr, QString &error,
+        bool *end = nullptr);
+    static int parse(FILE *f, varuint32 maxlen, QVector<WasmInstr> &instr,
+        QString &error);
+    bool operator==(const WasmInstr &other) const
+    {
+        return address == other.address
+            && instr == other.instr;
+    }
+};
+
+#endif
diff --git a/leb128.c b/leb128.c
new file mode 100644
index 0000000..091ff85
--- /dev/null
+++ b/leb128.c
@@ -0,0 +1,170 @@
+/*
+ * 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_value_type(FILE *const f, value_type *const out)
+{
+    return read_varint7(f, out);
+}
+
+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.cpp b/main.cpp
new file mode 100644
index 0000000..8977eff
--- /dev/null
+++ b/main.cpp
@@ -0,0 +1,11 @@
+#include "qwadb.h"
+
+#include <QApplication>
+
+int main(int argc, char *argv[])
+{
+    QApplication a(argc, argv);
+    QWadb w(a);
+    w.show();
+    return a.exec();
+}
diff --git a/qwadb.cpp b/qwadb.cpp
new file mode 100644
index 0000000..db3e2ec
--- /dev/null
+++ b/qwadb.cpp
@@ -0,0 +1,761 @@
+#include "qwadb.h"
+#include "ui_qwadb.h"
+#include "wasm.h"
+#include <QBrush>
+#include <QColor>
+#include <QCommandLineParser>
+#include <QFileDialog>
+#include <QMessageBox>
+#include <QPushButton>
+#include <QTcpSocket>
+#include <cctype>
+#include <cstdint>
+
+#define invoke(o, p) ((*o).*(p))
+
+int QWadb::trap(const QList<QByteArray> &params)
+{
+    bool ok;
+    const auto addr = params.at(0).toUInt(&ok, 0);
+
+    if (!ok)
+        return -1;
+
+    const auto &globals = w.globals();
+
+    ui.pause->setEnabled(false);
+    ui.globals->setRowCount(globals.size());
+
+    for (int i = 0; i < globals.size(); i++)
+    {
+        request req;
+
+        req.type = request::type::global;
+        req.index = req.rindex = i;
+        req.v = QVariant::fromValue(globals.at(i));
+        push(req);
+    }
+
+    const auto pr = w.routine(addr);
+
+    if (pr.isValid())
+    {
+        const auto r = pr.value<WasmRoutine>();
+        const auto &p = r.params;
+        const auto &l = r.locals;
+
+        ui.code->clear();
+        ui.code->setRowCount(r.instructions.size());
+
+        for (int i = 0; i < r.instructions.size(); i++)
+        {
+            const auto &in = r.instructions.at(i);
+            const auto saddr = QString::number(in.address, 16);
+            const auto addr_it = new QTableWidgetItem(saddr),
+                instr = new QTableWidgetItem(in.instr);
+
+            if (in.address == addr)
+            {
+                const auto brush = QBrush(QColor(255, 0, 0));
+
+                addr_it->setForeground(brush);
+                instr->setForeground(brush);
+            }
+
+            ui.code->setItem(i, 0, addr_it);
+            ui.code->setItem(i, 1, instr);
+        }
+
+        for (int i = 0; i < p.size(); i++)
+        {
+            request req;
+
+            req.type = request::type::param;
+            req.index = req.rindex = i;
+            req.v = QVariant::fromValue(p.at(i));
+            push(req);
+        }
+
+        for (int i = 0; i < l.size(); i++)
+        {
+            request req;
+
+            req.type = request::type::local;
+            req.index = i;
+            req.rindex = i + p.size();
+            req.v = QVariant::fromValue(l.at(i));
+            push(req);
+        }
+
+        ui.locals->setRowCount(l.size());
+        ui.params->setRowCount(p.size());
+        ui.routine->setText(r.name);
+    }
+    else
+    {
+        ui.params->clear();
+        ui.routine->setText("??");
+    }
+
+    {
+        QStringList headers;
+
+        headers << tr("Address");
+        headers << tr("Instruction");
+        ui.code->setHorizontalHeaderLabels(headers);
+    }
+
+    {
+        QStringList headers;
+
+        headers << tr("Name");
+        headers << tr("Type");
+        headers << tr("Value");
+        ui.params->setHorizontalHeaderLabels(headers);
+    }
+
+    {
+        QStringList headers;
+
+        headers << tr("Index");
+        headers << tr("Name");
+        headers << tr("Type");
+        headers << tr("Value");
+        ui.params->setHorizontalHeaderLabels(headers);
+    }
+
+    {
+        QStringList headers;
+
+        headers << tr("Index");
+        headers << tr("Type");
+        headers << tr("Value");
+        ui.locals->setHorizontalHeaderLabels(headers);
+    }
+
+    ui.pc->setText("0x" + QString::number(addr, 16));
+    emit sendreq();
+    return 0;
+}
+
+int QWadb::parse_global(const QList<QByteArray> &params) const
+{
+    const auto s = params.at(0);
+    const auto g = lastreq.v.value<WasmGlobal>();
+    const auto v = parse_value(s, g.type);
+
+    if (v.isNull())
+        return -1;
+
+    const auto uip = ui.globals;
+    QString stype = to_string(g.type);
+
+    if (!g.mutability)
+        stype = "const " + stype;
+
+    const auto index = new QTableWidgetItem(QString::number(lastreq.rindex)),
+        type = new QTableWidgetItem(stype),
+        value = new QTableWidgetItem(QString(s));
+
+    uip->setItem(lastreq.index, 0, index);
+    uip->setItem(lastreq.index, 1, type);
+    uip->setItem(lastreq.index, 2, value);
+    return 0;
+}
+
+int QWadb::parse_param(const QList<QByteArray> &params) const
+{
+    const auto s = params.at(0);
+    const auto p = lastreq.v.value<WasmParam>();
+    /* FIXME: WasmParam should have a valid type. */
+    const auto v = parse_value(s, WasmType::i64/* p.type */);
+
+    if (v.isNull())
+        return -1;
+
+    const auto uip = ui.params;
+    const auto index = new QTableWidgetItem(QString::number(lastreq.rindex)),
+        name = new QTableWidgetItem(p.name),
+        type = new QTableWidgetItem(p.dwtype),
+        value = new QTableWidgetItem(QString(s));
+
+    uip->setItem(lastreq.index, 0, index);
+    uip->setItem(lastreq.index, 1, name);
+    uip->setItem(lastreq.index, 2, type);
+    uip->setItem(lastreq.index, 3, value);
+    return 0;
+}
+
+const char *QWadb::to_fmt(const WasmType type) const
+{
+    switch (type)
+    {
+        case WasmType::i32:
+            return "i";
+
+        case WasmType::i64:
+            return "I";
+
+        case WasmType::f32:
+            return "f";
+
+        case WasmType::f64:
+            return "F";
+    }
+
+    return nullptr;
+}
+
+const char *QWadb::to_string(const WasmType type) const
+{
+    switch (type)
+    {
+        case WasmType::i32:
+            return "i32";
+
+        case WasmType::i64:
+            return "i64";
+
+        case WasmType::f32:
+            return "f32";
+
+        case WasmType::f64:
+            return "f64";
+    }
+
+    return nullptr;
+}
+
+int QWadb::from_string(const QString &s, WasmType &type) const
+{
+    int ret = 0;
+
+    if (s == "i32")
+        type = WasmType::i32;
+    else if (s == "i64")
+        type = WasmType::i64;
+    else if (s == "f32")
+        type = WasmType::f32;
+    else if (s == "f64")
+        type = WasmType::f64;
+    else
+        ret = -1;
+
+    return ret;
+}
+
+QVariant QWadb::parse_value(const QByteArray &v, const WasmType type) const
+{
+    bool ok;
+    QVariant ret;
+
+    switch (type)
+    {
+        case WasmType::i32:
+            ret = QVariant::fromValue(v.toUInt(&ok, 0));
+            break;
+
+        case WasmType::i64:
+            ret = QVariant::fromValue(v.toULongLong(&ok, 0));
+            break;
+
+        case WasmType::f32:
+        case WasmType::f64:
+            ret = QVariant::fromValue(v.toFloat(&ok));
+            break;
+    }
+
+    return ok ? ret : QVariant();
+}
+
+int QWadb::parse_local(const QList<QByteArray> &params) const
+{
+    const auto s = params.at(0);
+    const auto p = lastreq.v.value<WasmLocal>();
+    const auto v = parse_value(s, p.type);
+
+    if (v.isNull())
+        return -1;
+
+    const auto stype = to_string(p.type);
+    const auto uil = ui.locals;
+    const auto index = new QTableWidgetItem(QString::number(lastreq.rindex)),
+        type = new QTableWidgetItem(stype),
+        value = new QTableWidgetItem(QString(s));
+
+    uil->setItem(lastreq.index, 0, index);
+    uil->setItem(lastreq.index, 1, type);
+    uil->setItem(lastreq.index, 2, value);
+    return 0;
+}
+
+int QWadb::parse_linear(const QList<QByteArray> &params) const
+{
+    const auto s = params.at(0);
+    const auto type = lastreq.v.value<QWadbLinear>().type;
+    const auto v = parse_value(s, type);
+    struct item
+    {
+        QTableWidgetItem *addr, *value;
+    };
+
+    if (v.isNull())
+        return -1;
+
+    ui.linear_mem->clear();
+    ui.linear_value->setText(s);
+
+    size_t n;
+
+    switch (type)
+    {
+        case WasmType::i32:
+            n = sizeof (int32_t);
+            break;
+
+        case WasmType::i64:
+            n = sizeof (int64_t);
+            break;
+
+        case WasmType::f32:
+            n = sizeof (float);
+            break;
+
+        case WasmType::f64:
+            n = sizeof (double);
+            break;
+    }
+
+    ui.linear_mem->setRowCount(n);
+
+    for (size_t i = 0; i < n; i++)
+    {
+        auto it = new item;
+        quint8 byte;
+
+        switch (type)
+        {
+            case WasmType::i32:
+                byte = v.toUInt() >> (i * 8);
+                break;
+
+            case WasmType::i64:
+                byte = v.toULongLong() >> (i * 8);
+                break;
+
+            case WasmType::f32:
+            case WasmType::f64:
+                /* HACK */
+                byte = static_cast<uintmax_t>(v.toFloat()) >> (i * 8);
+                break;
+        }
+
+        auto sbyte = QString::number(byte, 16);
+
+        if (isprint(byte))
+        {
+            char c[sizeof "a"];
+
+            snprintf(c, sizeof c, "%c", byte);
+            sbyte += " '" + QString(c) + "'";
+        }
+
+        it->addr = new QTableWidgetItem(QString::number(lastreq.index + i, 16));
+        it->value = new QTableWidgetItem(sbyte);
+
+        ui.linear_mem->setItem(i, 0, it->addr);
+        ui.linear_mem->setItem(i, 1, it->value);
+    }
+
+    return 0;
+}
+
+int QWadb::ok(const QList<QByteArray> &params)
+{
+    int ret = 0;
+
+    switch (lastreq.type)
+    {
+        case request::type::global:
+            ret = parse_global(params);
+            break;
+
+        case request::type::param:
+            ret = parse_param(params);
+            break;
+
+        case request::type::local:
+            ret = parse_local(params);
+            break;
+
+        case request::type::linear:
+            ret = parse_linear(params);
+            break;
+
+        case request::type::bkpt:
+            break;
+    }
+
+    emit sendreq();
+    return ret;
+}
+
+int QWadb::parse(const QByteArray &frame)
+{
+    typedef int (QWadb::*method)(const QList<QByteArray> &);
+
+    static const struct
+    {
+        const char *s;
+        method fn;
+    } methods[] =
+    {
+        {"trap", &QWadb::trap},
+        {"ok", &QWadb::ok}
+    };
+
+    const auto tokens = frame.split(':');
+
+    for (const auto &m : methods)
+        if (m.s == tokens.at(0))
+            return invoke(this, m.fn)(tokens.mid(1));
+
+    return -1;
+}
+
+int QWadb::push(const request &r)
+{
+    reqs.enqueue(r);
+    return 0;
+}
+
+int QWadb::pop(request &r)
+{
+    if (reqs.isEmpty())
+        return -1;
+
+    r = reqs.dequeue();
+    return 0;
+}
+
+int QWadb::process(const QByteArray &frame)
+{
+    if (frame.contains(':'))
+        return parse(frame);
+
+    return 0;
+}
+
+int QWadb::getlf(const char b)
+{
+    const int maxlen = 128;
+
+    if (b == '\n')
+    {
+        const auto ret = process(frame);
+
+        frame.clear();
+        step = &QWadb::getsync;
+        return ret;
+    }
+    else if (frame.length() >= maxlen)
+        return -1;
+
+    frame.append(b);
+    return 0;
+}
+
+int QWadb::getsync(const char b)
+{
+    if (b == ';')
+        step = &QWadb::getlf;
+
+    return 0;
+}
+
+int QWadb::write(const QByteArray &ba)
+{
+    auto rem = ba.size();
+    const char *p = ba.constData();
+
+    while (rem)
+    {
+        auto n = socket.write(p, rem);
+
+        if (n < 0)
+            return -1;
+
+        rem -= n;
+        p += n;
+    }
+
+    return 0;
+}
+
+void QWadb::disconnected(void)
+{
+    connected = false;
+    ui.run->setEnabled(false);
+    ui.step->setEnabled(false);
+    ui.pause->setEnabled(false);
+    ui.linear_read->setEnabled(false);
+    ui.connect->setEnabled(true);
+    ui.connect->setText(tr("Connect"));
+}
+
+void QWadb::open(const QString &path)
+{
+    Wasm w;
+    QString error;
+
+    if (w.open(path, error))
+    {
+        QMessageBox::critical(this, tr("QWadb"), error);
+        ui.modpath->clear();
+        return;
+    }
+
+    ui.modpath->setText(path);
+    this->w = w;
+}
+
+QWadb::QWadb(const QCoreApplication &app, QWidget *parent)
+    : QMainWindow(parent),
+    connected(false),
+    socket(this),
+    step(&QWadb::getsync)
+{
+    QCommandLineParser parser;
+    QStringList args;
+
+    ui.setupUi(this);
+    parser.addHelpOption();
+    parser.addPositionalArgument("file", "WebAssembly file to debug");
+    parser.process(app);
+    args = parser.positionalArguments();
+
+    if (args.size())
+        open(args.at(0));
+
+    connect(&socket, &QTcpSocket::connected, this,
+    [this]
+    {
+        connected = true;
+        ui.connect->setEnabled(true);
+        ui.connect->setText(tr("Disconnect"));
+    });
+
+    connect(&socket, &QTcpSocket::disconnected, this, &QWadb::disconnected);
+
+    connect(&socket, &QTcpSocket::errorOccurred, this,
+    [this]
+    {
+        socket.disconnect();
+        ui.run->setEnabled(false);
+        ui.step->setEnabled(false);
+        ui.pause->setEnabled(false);
+        ui.linear_read->setEnabled(false);
+        emit disconnected();
+        QMessageBox::critical(this, tr("QWadb"), socket.errorString());
+    });
+
+    connect(&socket, &QTcpSocket::readyRead, this,
+    [this]
+    {
+        auto ba = socket.readAll();
+
+        for (auto b : ba)
+            if (invoke(this, step)(b))
+            {
+                frame.clear();
+                step = &QWadb::getsync;
+            }
+    });
+
+    connect(ui.open, &QPushButton::released, this,
+    [this]
+    {
+        auto f = QFileDialog::getOpenFileName(this, tr("Open Wasm file"));
+
+        if (f.isEmpty())
+            return;
+
+        open(f);
+    });
+
+    connect(ui.connect, &QPushButton::released, this,
+    [this]
+    {
+        if (connected)
+        {
+            socket.disconnect();
+            emit disconnected();
+            return;
+        }
+
+        const auto host = ui.host->text(), port = ui.port->text();
+
+        if (host.isEmpty() || port.isEmpty())
+        {
+            QMessageBox::critical(this, tr("QWadb"),
+                tr("Missing hostname or port"));
+            return;
+        }
+
+        ui.connect->setEnabled(false);
+        ui.connect->setText(tr("Connecting..."));
+        socket.connectToHost(host, port.toUInt());
+    });
+
+    connect(ui.step, &QPushButton::released, this,
+    [this]
+    {
+        ui.run->setEnabled(false);
+        ui.step->setEnabled(false);
+        ui.pause->setEnabled(true);
+        ui.toggle_bkpt->setEnabled(false);
+        ui.linear_read->setEnabled(false);
+
+        write(";s\n");
+    });
+
+    connect(ui.run, &QPushButton::released, this,
+    [this]
+    {
+        ui.run->setEnabled(false);
+        ui.step->setEnabled(false);
+        ui.pause->setEnabled(true);
+        ui.toggle_bkpt->setEnabled(false);
+
+        write(";c\n");
+    });
+
+    connect(ui.toggle_bkpt, &QPushButton::released, this,
+    [this]
+    {
+        const auto s = ui.bkpt->text();
+        QVariant r;
+        request req;
+
+        req.type = request::type::bkpt;
+
+        if (s.isEmpty())
+        {
+            QMessageBox::information(this, tr("QWadb"),
+                tr("Missing function name or address"));
+            return;
+        }
+        else if ((r = w.routine(s)).isValid())
+            req.index = r.value<WasmRoutine>().lopc;
+        else
+        {
+            bool ok;
+            const auto addr = s.toUInt(&ok, 0);
+
+            if (!ok)
+            {
+                QMessageBox::warning(this, tr("QWadb"),
+                    tr("Invalid function name or address: ") + s);
+                return;
+            }
+
+            req.index = addr;
+        }
+
+        ui.bkpt->clear();
+        push(req);
+        emit sendreq();
+    });
+
+    connect(ui.pause, &QPushButton::released, this,
+    [this]
+    {
+        QByteArray ba;
+
+        ui.pause->setEnabled(false);
+        ba.push_back(-1);
+        socket.write(ba);
+    });
+
+    connect(ui.linear_read, &QPushButton::released, this,
+    [this]
+    {
+        QWadbLinear l;
+        request r;
+        bool ok;
+        const auto saddr = ui.linear_addr->text(),
+            stype = ui.linear_type->currentText();
+        unsigned long addr = saddr.toULong(&ok, 0);
+
+        if (!ok || addr > UINT32_MAX)
+        {
+            QMessageBox::warning(this, tr("QWadb"),
+                tr("Invalid address: ") + saddr);
+            return;
+        }
+        else if (from_string(stype, l.type))
+        {
+            QMessageBox::warning(this, tr("QWadb"),
+                tr("Invalid type: ") + stype);
+            return;
+        }
+
+        r.type = request::type::linear;
+        r.index = addr;
+        r.v = QVariant::fromValue(l);
+        ui.run->setEnabled(false);
+        ui.step->setEnabled(false);
+        ui.linear_read->setEnabled(false);
+        push(r);
+        emit sendreq();
+    });
+
+    connect(this, &QWadb::sendreq, this,
+    [this]
+    {
+        request r;
+
+        if (pop(r))
+        {
+            ui.toggle_bkpt->setEnabled(true);
+            ui.step->setEnabled(true);
+            ui.run->setEnabled(true);
+            ui.linear_read->setEnabled(true);
+            return;
+        }
+
+        QByteArray ba = ";";
+
+        switch (r.type)
+        {
+            case request::type::global:
+                ba.push_back("g:");
+                break;
+
+            case request::type::bkpt:
+                ba.push_back("b:");
+                break;
+
+            case request::type::param:
+                ba.push_back("p:");
+                break;
+
+            case request::type::local:
+                ba.push_back("l:");
+                break;
+
+            case request::type::linear:
+            {
+                const auto type = r.v.value<QWadbLinear>().type;
+
+                ba.push_back("m:" + QByteArray(to_fmt(type)) + ":");
+            }
+                break;
+        }
+
+        ba.push_back(QString::number(r.index).toUtf8());
+        ba.push_back('\n');
+        write(ba);
+        lastreq = r;
+    });
+}
diff --git a/qwadb.h b/qwadb.h
new file mode 100644
index 0000000..87335cf
--- /dev/null
+++ b/qwadb.h
@@ -0,0 +1,82 @@
+#ifndef QWADB_H
+#define QWADB_H
+
+#include <QByteArray>
+#include <QList>
+#include <QMainWindow>
+#include <QTcpSocket>
+#include <QQueue>
+#include "ui_qwadb.h"
+#include "wasm.h"
+
+QT_BEGIN_NAMESPACE
+namespace Ui {
+class QWadb;
+}
+QT_END_NAMESPACE
+
+struct QWadbLinear
+{
+    WasmType type;
+};
+
+Q_DECLARE_METATYPE(QWadbLinear);
+
+class QWadb : public QMainWindow
+{
+    Q_OBJECT
+
+public:
+    QWadb(const QCoreApplication &app, QWidget *parent = nullptr);
+
+private:
+
+    struct request
+    {
+        enum class type {global, local, param, bkpt, linear} type;
+        varuint32 index, rindex;
+        QVariant v;
+    };
+
+    void open(const QString &path);
+
+    int trap(const QList<QByteArray> &frame);
+    int ok(const QList<QByteArray> &frame);
+    int parse(const QByteArray &frame);
+    int process(const QByteArray &frame);
+    QVariant parse_value(const QByteArray &v, WasmType type) const;
+    int parse_global(const QList<QByteArray> &params) const;
+    int parse_param(const QList<QByteArray> &params) const;
+    int parse_local(const QList<QByteArray> &params) const;
+    int parse_linear(const QList<QByteArray> &params) const;
+
+    int push(const request &r);
+    int pop(request &r);
+
+    typedef int (QWadb::*stepfn)(char);
+    int getlf(char b);
+    int getsync(char b);
+
+    int write(const QByteArray &ba);
+
+    const char *to_fmt(WasmType type) const;
+    const char *to_string(WasmType type) const;
+    int from_string(const QString &s, WasmType &type) const;
+
+    request lastreq;
+    bool connected;
+    QTcpSocket socket;
+    QByteArray frame;
+    QQueue<request> reqs;
+    stepfn step;
+    Ui::QWadb ui;
+    Wasm w;
+
+signals:
+    void sendreq(void);
+
+private slots:
+    void disconnected(void);
+};
+
+#endif
diff --git a/qwadb.ui b/qwadb.ui
new file mode 100644
index 0000000..85c66cb
--- /dev/null
+++ b/qwadb.ui
@@ -0,0 +1,510 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>QWadb</class>
+ <widget class="QMainWindow" name="QWadb">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>800</width>
+    <height>644</height>
+   </rect>
+  </property>
+  <property name="windowTitle">
+   <string>QWadb</string>
+  </property>
+  <widget class="QWidget" name="centralwidget">
+   <layout class="QGridLayout" name="gridLayout_2">
+    <item row="0" column="0">
+     <layout class="QGridLayout" name="gridLayout">
+      <item row="2" column="0">
+       <layout class="QHBoxLayout" name="horizontalLayout_2">
+        <item>
+         <widget class="QLabel" name="label_3">
+          <property name="text">
+           <string>Host:</string>
+          </property>
+         </widget>
+        </item>
+        <item>
+         <widget class="QLineEdit" name="host">
+          <property name="text">
+           <string>localhost</string>
+          </property>
+          <property name="clearButtonEnabled">
+           <bool>true</bool>
+          </property>
+         </widget>
+        </item>
+        <item>
+         <widget class="QLabel" name="label_4">
+          <property name="text">
+           <string>Port:</string>
+          </property>
+         </widget>
+        </item>
+        <item>
+         <widget class="QLineEdit" name="port">
+          <property name="text">
+           <string>33307</string>
+          </property>
+          <property name="maxLength">
+           <number>5</number>
+          </property>
+          <property name="clearButtonEnabled">
+           <bool>true</bool>
+          </property>
+         </widget>
+        </item>
+       </layout>
+      </item>
+      <item row="4" column="0">
+       <widget class="QTableWidget" name="code">
+        <property name="sizePolicy">
+         <sizepolicy hsizetype="Expanding" vsizetype="Expanding">
+          <horstretch>0</horstretch>
+          <verstretch>0</verstretch>
+         </sizepolicy>
+        </property>
+        <property name="font">
+         <font>
+          <family>FreeMono</family>
+         </font>
+        </property>
+        <property name="editTriggers">
+         <set>QAbstractItemView::NoEditTriggers</set>
+        </property>
+        <property name="selectionBehavior">
+         <enum>QAbstractItemView::SelectRows</enum>
+        </property>
+        <property name="gridStyle">
+         <enum>Qt::NoPen</enum>
+        </property>
+        <property name="cornerButtonEnabled">
+         <bool>true</bool>
+        </property>
+        <property name="rowCount">
+         <number>0</number>
+        </property>
+        <property name="columnCount">
+         <number>2</number>
+        </property>
+        <attribute name="horizontalHeaderVisible">
+         <bool>true</bool>
+        </attribute>
+        <attribute name="horizontalHeaderStretchLastSection">
+         <bool>true</bool>
+        </attribute>
+        <attribute name="verticalHeaderVisible">
+         <bool>false</bool>
+        </attribute>
+        <column>
+         <property name="text">
+          <string>Address</string>
+         </property>
+        </column>
+        <column>
+         <property name="text">
+          <string>Instruction</string>
+         </property>
+        </column>
+       </widget>
+      </item>
+      <item row="4" column="1">
+       <widget class="QTabWidget" name="tabWidget">
+        <property name="currentIndex">
+         <number>0</number>
+        </property>
+        <widget class="QWidget" name="tab_7">
+         <attribute name="title">
+          <string>Variables</string>
+         </attribute>
+         <layout class="QVBoxLayout" name="verticalLayout_3">
+          <item>
+           <layout class="QVBoxLayout" name="verticalLayout">
+            <item>
+             <widget class="QLabel" name="label_2">
+              <property name="text">
+               <string>Parameters:</string>
+              </property>
+             </widget>
+            </item>
+            <item>
+             <widget class="QTableWidget" name="params">
+              <property name="editTriggers">
+               <set>QAbstractItemView::NoEditTriggers</set>
+              </property>
+              <property name="gridStyle">
+               <enum>Qt::NoPen</enum>
+              </property>
+              <property name="rowCount">
+               <number>0</number>
+              </property>
+              <property name="columnCount">
+               <number>4</number>
+              </property>
+              <attribute name="horizontalHeaderStretchLastSection">
+               <bool>true</bool>
+              </attribute>
+              <attribute name="verticalHeaderVisible">
+               <bool>false</bool>
+              </attribute>
+              <column>
+               <property name="text">
+                <string>Index</string>
+               </property>
+              </column>
+              <column>
+               <property name="text">
+                <string>Name</string>
+               </property>
+              </column>
+              <column>
+               <property name="text">
+                <string>Type</string>
+               </property>
+              </column>
+              <column>
+               <property name="text">
+                <string>Value</string>
+               </property>
+              </column>
+             </widget>
+            </item>
+            <item>
+             <widget class="QLabel" name="label">
+              <property name="text">
+               <string>Locals:</string>
+              </property>
+             </widget>
+            </item>
+            <item>
+             <widget class="QTableWidget" name="locals">
+              <property name="editTriggers">
+               <set>QAbstractItemView::NoEditTriggers</set>
+              </property>
+              <attribute name="horizontalHeaderStretchLastSection">
+               <bool>true</bool>
+              </attribute>
+              <attribute name="verticalHeaderVisible">
+               <bool>false</bool>
+              </attribute>
+              <column>
+               <property name="text">
+                <string>Index</string>
+               </property>
+              </column>
+              <column>
+               <property name="text">
+                <string>Type</string>
+               </property>
+              </column>
+              <column>
+               <property name="text">
+                <string>Value</string>
+               </property>
+              </column>
+             </widget>
+            </item>
+            <item>
+             <widget class="QLabel" name="label_5">
+              <property name="text">
+               <string>Globals:</string>
+              </property>
+             </widget>
+            </item>
+            <item>
+             <widget class="QTableWidget" name="globals">
+              <attribute name="verticalHeaderVisible">
+               <bool>false</bool>
+              </attribute>
+              <column>
+               <property name="text">
+                <string>Index</string>
+               </property>
+              </column>
+              <column>
+               <property name="text">
+                <string>Type</string>
+               </property>
+              </column>
+              <column>
+               <property name="text">
+                <string>Value</string>
+               </property>
+              </column>
+             </widget>
+            </item>
+           </layout>
+          </item>
+         </layout>
+        </widget>
+        <widget class="QWidget" name="tab_8">
+         <attribute name="title">
+          <string>Linear memory</string>
+         </attribute>
+         <layout class="QVBoxLayout" name="verticalLayout_5">
+          <item>
+           <layout class="QVBoxLayout" name="verticalLayout_4">
+            <item>
+             <layout class="QHBoxLayout" name="horizontalLayout_7">
+              <item>
+               <widget class="QLabel" name="label_9">
+                <property name="text">
+                 <string>Linear memory:</string>
+                </property>
+               </widget>
+              </item>
+              <item>
+               <widget class="QLineEdit" name="linear_addr">
+                <property name="sizePolicy">
+                 <sizepolicy hsizetype="Expanding" vsizetype="Fixed">
+                  <horstretch>0</horstretch>
+                  <verstretch>0</verstretch>
+                 </sizepolicy>
+                </property>
+               </widget>
+              </item>
+              <item>
+               <widget class="QComboBox" name="linear_type">
+                <item>
+                 <property name="text">
+                  <string>i32</string>
+                 </property>
+                </item>
+                <item>
+                 <property name="text">
+                  <string>i64</string>
+                 </property>
+                </item>
+                <item>
+                 <property name="text">
+                  <string>f32</string>
+                 </property>
+                </item>
+                <item>
+                 <property name="text">
+                  <string>f64</string>
+                 </property>
+                </item>
+               </widget>
+              </item>
+              <item>
+               <widget class="QPushButton" name="linear_read">
+                <property name="text">
+                 <string>Read</string>
+                </property>
+               </widget>
+              </item>
+             </layout>
+            </item>
+           </layout>
+          </item>
+          <item>
+           <layout class="QVBoxLayout" name="verticalLayout_7">
+            <item>
+             <widget class="QLineEdit" name="linear_value">
+              <property name="enabled">
+               <bool>true</bool>
+              </property>
+              <property name="readOnly">
+               <bool>true</bool>
+              </property>
+             </widget>
+            </item>
+            <item>
+             <widget class="QTableWidget" name="linear_mem">
+              <attribute name="horizontalHeaderStretchLastSection">
+               <bool>true</bool>
+              </attribute>
+              <attribute name="verticalHeaderVisible">
+               <bool>false</bool>
+              </attribute>
+              <column>
+               <property name="text">
+                <string>Address</string>
+               </property>
+              </column>
+              <column>
+               <property name="text">
+                <string>Value</string>
+               </property>
+              </column>
+             </widget>
+            </item>
+           </layout>
+          </item>
+         </layout>
+        </widget>
+       </widget>
+      </item>
+      <item row="2" column="1">
+       <layout class="QHBoxLayout" name="horizontalLayout_4">
+        <item>
+         <widget class="QPushButton" name="connect">
+          <property name="text">
+           <string>Connect</string>
+          </property>
+         </widget>
+        </item>
+        <item>
+         <widget class="QPushButton" name="open">
+          <property name="text">
+           <string>Open file</string>
+          </property>
+         </widget>
+        </item>
+       </layout>
+      </item>
+     </layout>
+    </item>
+    <item row="1" column="0">
+     <layout class="QVBoxLayout" name="verticalLayout_2">
+      <item>
+       <layout class="QHBoxLayout" name="horizontalLayout_5">
+        <item>
+         <widget class="QLabel" name="label_7">
+          <property name="sizePolicy">
+           <sizepolicy hsizetype="Minimum" vsizetype="Preferred">
+            <horstretch>0</horstretch>
+            <verstretch>0</verstretch>
+           </sizepolicy>
+          </property>
+          <property name="text">
+           <string>Loaded Wasm module:</string>
+          </property>
+         </widget>
+        </item>
+        <item>
+         <widget class="QLabel" name="modpath">
+          <property name="sizePolicy">
+           <sizepolicy hsizetype="Preferred" vsizetype="Preferred">
+            <horstretch>1</horstretch>
+            <verstretch>0</verstretch>
+           </sizepolicy>
+          </property>
+          <property name="text">
+           <string/>
+          </property>
+         </widget>
+        </item>
+       </layout>
+      </item>
+      <item>
+       <layout class="QHBoxLayout" name="horizontalLayout_3">
+        <item>
+         <widget class="QLabel" name="label_8">
+          <property name="text">
+           <string>Program counter:</string>
+          </property>
+         </widget>
+        </item>
+        <item>
+         <widget class="QLabel" name="pc">
+          <property name="sizePolicy">
+           <sizepolicy hsizetype="Preferred" vsizetype="Preferred">
+            <horstretch>1</horstretch>
+            <verstretch>0</verstretch>
+           </sizepolicy>
+          </property>
+          <property name="text">
+           <string/>
+          </property>
+         </widget>
+        </item>
+        <item>
+         <widget class="QLabel" name="label_6">
+          <property name="text">
+           <string>Routine:</string>
+          </property>
+         </widget>
+        </item>
+        <item>
+         <widget class="QLabel" name="routine">
+          <property name="sizePolicy">
+           <sizepolicy hsizetype="Preferred" vsizetype="Preferred">
+            <horstretch>1</horstretch>
+            <verstretch>0</verstretch>
+           </sizepolicy>
+          </property>
+          <property name="text">
+           <string/>
+          </property>
+         </widget>
+        </item>
+       </layout>
+      </item>
+      <item>
+       <layout class="QHBoxLayout" name="horizontalLayout_6">
+        <item>
+         <widget class="QLineEdit" name="bkpt"/>
+        </item>
+        <item>
+         <widget class="QPushButton" name="toggle_bkpt">
+          <property name="enabled">
+           <bool>false</bool>
+          </property>
+          <property name="text">
+           <string>Toggle breakpoint</string>
+          </property>
+         </widget>
+        </item>
+       </layout>
+      </item>
+      <item>
+       <layout class="QHBoxLayout" name="horizontalLayout">
+        <item>
+         <widget class="QPushButton" name="step">
+          <property name="enabled">
+           <bool>false</bool>
+          </property>
+          <property name="text">
+           <string>Single step (F10)</string>
+          </property>
+         </widget>
+        </item>
+        <item>
+         <widget class="QPushButton" name="run">
+          <property name="enabled">
+           <bool>false</bool>
+          </property>
+          <property name="text">
+           <string>Continue (F5)</string>
+          </property>
+         </widget>
+        </item>
+        <item>
+         <widget class="QPushButton" name="pause">
+          <property name="enabled">
+           <bool>false</bool>
+          </property>
+          <property name="text">
+           <string>Pause</string>
+          </property>
+         </widget>
+        </item>
+       </layout>
+      </item>
+     </layout>
+    </item>
+   </layout>
+  </widget>
+  <widget class="QMenuBar" name="menubar">
+   <property name="geometry">
+    <rect>
+     <x>0</x>
+     <y>0</y>
+     <width>800</width>
+     <height>30</height>
+    </rect>
+   </property>
+  </widget>
+  <widget class="QStatusBar" name="statusbar">
+   <property name="enabled">
+    <bool>true</bool>
+   </property>
+  </widget>
+ </widget>
+ <resources/>
+ <connections/>
+</ui>
diff --git a/types.h b/types.h
new file mode 100644
index 0000000..efdd2fd
--- /dev/null
+++ b/types.h
@@ -0,0 +1,74 @@
+/*
+ * 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>
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+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);
+int read_value_type(FILE *f, value_type *out);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
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 &sections[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));
+}
diff --git a/wasm.h b/wasm.h
new file mode 100644
index 0000000..0bb6269
--- /dev/null
+++ b/wasm.h
@@ -0,0 +1,184 @@
+#ifndef WASM_H
+#define WASM_H
+
+#include "instr.h"
+#include <libdwarf/libdwarf.h>
+#include <QHash>
+#include <QObject>
+#include <QString>
+#include <QVariant>
+#include <QVector>
+#include <cerrno>
+#include <cstdio>
+#include <cstring>
+#include "types.h"
+
+enum class WasmType
+{
+    i32,
+    i64,
+    f32,
+    f64
+};
+
+struct WasmGlobal
+{
+    WasmType type;
+    bool mutability;
+    bool operator==(const WasmGlobal &other) const
+    {
+        return type == other.type
+            && mutability == other.mutability;
+    }
+};
+
+struct WasmLocal
+{
+    WasmType type;
+    bool operator==(const WasmLocal &other) const
+    {
+        return type == other.type;
+    }
+};
+
+struct WasmParam
+{
+    QString name, dwtype;
+    WasmType type;
+    bool operator==(const WasmParam &other) const
+    {
+        return type == other.type
+            && name == other.name
+            && dwtype == other.dwtype;
+    }
+};
+
+struct WasmRoutine
+{
+    QString name;
+    quint32 lopc, hipc;
+    QVector<WasmParam> params;
+    QVector<WasmLocal> locals;
+    QVector<WasmInstr> instructions;
+    bool operator==(const WasmRoutine &other) const
+    {
+        return name == other.name
+            && lopc == other.lopc
+            && hipc == other.hipc
+            && params == other.params
+            && locals == other.locals
+            && instructions == other.instructions;
+    }
+};
+
+Q_DECLARE_METATYPE(WasmGlobal);
+Q_DECLARE_METATYPE(WasmLocal);
+Q_DECLARE_METATYPE(WasmParam);
+Q_DECLARE_METATYPE(WasmRoutine);
+
+class Wasm
+{
+public:
+    Wasm();
+    ~Wasm();
+    int open(const QString &path, QString &error);
+    const QVector<WasmGlobal> globals() const;
+    QVariant routine(const QString &name) const;
+    QVariant routine(quint32 addr) const;
+
+private:
+
+    struct section
+    {
+        varuint7 code;
+        varuint32 len;
+        QString name;
+    };
+
+    struct dwsection
+    {
+        quint32 offset;
+        varuint32 len;
+        QVector<Dwarf_Small> data;
+        dwsection() : offset(0), len(0) {}
+    };
+
+    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;
+    };
+
+    struct attr
+    {
+        QString name;
+        QVariant value;
+    };
+
+    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
+    };
+
+    int parse(QString &error);
+    int parse_global(QString &error);
+    int parse_import(QString &error);
+    int parse_code(QString &error);
+    int parse_body(varuint32 index, QString &error);
+    int parse_name(QString &error, varuint32 len);
+    int parse_fname(QString &error, varuint32 maxlen);
+    int get_type(value_type type, WasmType &wtype) const;
+    int check_header(QString &error) const;
+    int read_section(QString &error);
+    int parse_header(section &s, QString &error) const;
+    int read_name(QString &name, QString &error) const;
+    dwsection *getdws(const QString &name);
+    int skip(const section &s, QString &error) const;
+    int read_dwarf(const Dwarf_Debug dbg,
+        header &h, Dwarf_Error &e, QString &error);
+    int read_child(Dwarf_Debug dbg,
+        Dwarf_Die die, Dwarf_Error &e, QString &error);
+    int process_die(Dwarf_Debug dbg,
+        Dwarf_Die die, Dwarf_Error &e, QString &error);
+    int read_attr(Dwarf_Attribute a, Dwarf_Error &e, QString &error,
+        attr &attr);
+
+    static bool isformstring(Dwarf_Half form);
+    static bool isformaddr(Dwarf_Half form);
+    static bool isformudata(Dwarf_Half form);
+    static bool isformsdata(Dwarf_Half form);
+
+    static int load_section(void *const obj, const Dwarf_Half section_index,
+        Dwarf_Small **const return_data, int *const error);
+    static int get_section_info(void *const obj, const Dwarf_Half section_index,
+        Dwarf_Obj_Access_Section *const return_section, int *const error);
+    static Dwarf_Unsigned get_section_count(void *const obj);
+
+    FILE *f;
+    long code_offset;
+    varuint32 import_fncnt;
+    dwsection sections[NSECTIONS];
+    QVariant lastwr;
+    QHash<varuint32, WasmRoutine> fmap;
+    QVector<WasmGlobal> vglobals;
+    static const char *const names[NSECTIONS];
+};
+
+#endif