sym_convert wasm diet: 31.3->11.05 MB via kiface prune + link-order shims (ysync 0009)
New wasm/cli/sym_convert_stubs.cpp: first-definition-wins overrides (--allow-multiple-definition) severing schematic load/save, the KIFONT factory (drops newstroke + freetype/harfbuzz), and the four UI virtuals whose bodies reference pruned typeinfo/data. New wasm/bindings/sym_convert_embind.cpp: no-op kicadCollabOnSave so the converter stops linking eeschema's embind object (and --bind) that rooted the editor surface from .init_array. build-kicad-target.sh: per-app EMBIND_LINK_FLAG + sym_convert now uses its own embind TU. Bumps kicad (kiface prune, gated). Output byte-identical on the qa corpus. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01H58sC87w12FotXEmxrJrQV
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Gergő Törcsvári
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4 changed files with 144 additions and 9 deletions
115
wasm/cli/sym_convert_stubs.cpp
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115
wasm/cli/sym_convert_stubs.cpp
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// sym_convert link-time diet stubs (ysync 0009 size research, steps (b)+(c)).
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//
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// This TU is listed in add_executable(sym_convert …) BEFORE the kiface object
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// library and archives, and the target links with --allow-multiple-definition:
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// wasm-ld resolves duplicate strong symbols to the FIRST definition, so these
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// override the real out-of-line definitions without touching KiCad sources.
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// The losing definitions become unreferenced and post-link GC drops them plus
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// everything only they reached.
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//
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// Safety (verified in 0009-kicad-lint-size-research.md §3): ConvertLibrary uses
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// only the symbol-library entry points (EnumerateSymbolLib/SaveLibrary/
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// SaveSymbol); parse never resolves fonts (SetUnresolvedFontName) and the
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// writer prints only already-set font names. Every stub below either throws or
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// aborts LOUDLY — a violated assumption fails the conversion, never corrupts it.
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#include <cstdio>
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#include <cstdlib>
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#include <ki_exception.h>
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#include <font/font.h>
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#include <sch_field.h>
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#include <sch_io/kicad_legacy/sch_io_kicad_legacy.h>
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#include <sch_io/kicad_sexpr/sch_io_kicad_sexpr.h>
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#include <sch_pin.h>
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#include <sch_text.h>
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#include <sch_textbox.h>
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// ── (b) schematic-file entry points ──────────────────────────────────────────
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// Severs the schematic half of both instantiated plugins: ParseSchematic,
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// SCHEMATIC/SCH_SCREEN/sheets, SCH_SYMBOL/SCH_LINE/labels/groups vtables (and
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// their Plot/font/GUI edges), Fontconfig()->ListFonts and Pgm().
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SCH_SHEET* SCH_IO_KICAD_SEXPR::LoadSchematicFile( const wxString& aFileName, SCHEMATIC*,
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SCH_SHEET*,
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const std::map<std::string, UTF8>* )
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{
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THROW_IO_ERROR( wxString::Format(
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wxS( "sym_convert: schematic loading is compiled out (stub); cannot load '%s'" ),
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aFileName ) );
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}
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void SCH_IO_KICAD_SEXPR::SaveSchematicFile( const wxString& aFileName, SCH_SHEET*, SCHEMATIC*,
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const std::map<std::string, UTF8>* )
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{
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THROW_IO_ERROR( wxString::Format(
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wxS( "sym_convert: schematic saving is compiled out (stub); cannot save '%s'" ),
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aFileName ) );
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}
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SCH_SHEET* SCH_IO_KICAD_LEGACY::LoadSchematicFile( const wxString& aFileName, SCHEMATIC*,
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SCH_SHEET*,
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const std::map<std::string, UTF8>* )
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{
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THROW_IO_ERROR( wxString::Format(
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wxS( "sym_convert: schematic loading is compiled out (stub); cannot load '%s'" ),
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aFileName ) );
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}
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void SCH_IO_KICAD_LEGACY::SaveSchematicFile( const wxString& aFileName, SCH_SHEET*, SCHEMATIC*,
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const std::map<std::string, UTF8>* )
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{
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THROW_IO_ERROR( wxString::Format(
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wxS( "sym_convert: schematic saving is compiled out (stub); cannot save '%s'" ),
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aFileName ) );
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}
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// ── (e) UI virtuals whose real bodies reference pruned typeinfo/data ─────────
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// The kiface prune (cut e) leaves these vtable-pinned bodies referencing
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// typeinfo for SCH_NAVIGATE_TOOL / SCH_EDIT_FRAME and SCH_NAVIGATE_TOOL::
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// g_BackLink — DATA symbols, which (unlike functions) cannot become JS imports
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// under -sERROR_ON_UNDEFINED_SYMBOLS=0. Overriding the whole virtual here makes
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// the real body a discarded duplicate, so its relocations are never processed
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// and the KiCad sources stay untouched. All four are user-interaction paths a
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// headless converter cannot reach (hypertext clicks, the message panel).
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void SCH_FIELD::DoHypertextAction( EDA_DRAW_FRAME*, const VECTOR2I& ) const
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{
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}
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void SCH_TEXT::DoHypertextAction( EDA_DRAW_FRAME*, const VECTOR2I& ) const
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{
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}
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void SCH_TEXTBOX::DoHypertextAction( EDA_DRAW_FRAME*, const VECTOR2I& ) const
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{
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}
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void SCH_PIN::GetMsgPanelInfo( EDA_DRAW_FRAME*, std::vector<MSG_PANEL_ITEM>& )
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{
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}
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// ── (c) font-factory choke point ─────────────────────────────────────────────
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// The single route into the font engine: severs STROKE_FONT::LoadFont (and the
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// 2.7 MB newstroke glyph data), OUTLINE_FONT (freetype + harfbuzz), fontconfig.
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// abort() (not a soft null) so any violated assumption surfaces immediately in
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// the qa corpus instead of producing subtly wrong output.
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namespace KIFONT
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{
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FONT* FONT::GetFont( const wxString&, bool, bool, const std::vector<wxString>*, bool )
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{
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std::fprintf( stderr,
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"sym_convert: FATAL: KIFONT::FONT::GetFont called — the font engine is "
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"compiled out (ysync 0009 diet stub)\n" );
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std::abort();
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}
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} // namespace KIFONT
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