Session Handoff: WiseCode Visual C IDE — Session 9

Date: June 23, 2026

Summary

Refactored code generation to eliminate duplicated logic, added loop support via goto labels, fixed C code quality issues, and added compilation tests.

Changes

Shared codegen module (`codegen/index.js` — new)

Pure C code generation with zero DOM dependencies. Exports as window.CodeGen (browser) and module.exports (Node.js):

branchDescendants(roots, isDecision) — discovers reachable blocks, excluding decisions
emitBranch(roots, stop, visited, isDecision) — emits C code for a branch via generateCode, with goto on back-edges
generateCallWithError(ifHeader, errTargets, okTargets, isDecision) — shared visited set across all branches to prevent duplicate labels
generateCFile(entryBlock, includes, declarations) — assembles complete C file

Browser blocks adapted

blocks-proc.js: _branchDescendants and _emitBranch are now 3-line adapters passing b instanceof WCDecision to CodeGen. _generateCallWithError delegates to CodeGen.generateCallWithError.
blocks-algo.js: WCDecision._emitBranch delegates to generateCode (not generateOwnCode), uses visited in-place. _emitBranch skips roots already visited by prior roots.
index.html: codegen/index.js loaded before blocks-proc.js.

Loop support

Every block in #draw-area emits a C label (block_id:) before its code. generateNextCode emits goto label; when a target is already visited (back-edge). _emitBranch emits goto label; when encountering a visited block.

Files changed: wcblock.js, blocks-algo.js, blocks-proc.js, codegen/index.js

C code quality fixes

Double return 0: wcprogram.js now checks if the body already contains a return/exit before appending the hardcoded return 0;\n.
Variable labels: WCBlock.generateCode checks _isFlowBlock (set from #draw-area presence). Variable blocks in #variable-area skip label/goto logic.
Default array removed: Unconditional vertices array creation in app.js:main() removed. Templates should create their own variables.

Compilation tests (`tests/compile/`)

Makefile: Uses pkg-config, compiles with -Wall -Wextra -fsyntax-only
run.js: Uses shared CodeGen module — no duplicated branchDescendants/emitBranch/generateCode logic
5 test cases (console, error-simple, error-merge, error-sequential, error-value) all pass

Colour: dataset.exitError instead of tagName === "WC-END" — success ENDs default to blue
Value: setAttribute("value", ...) alongside input.value = ... — cloneNode(true) preserves formatted display
4 regression tests added

Warning icon overlap

padding-right added to .proccall-header and .end-header when warnings active, preventing ::after text from colliding with the .block-warn icon.

Template spacing

Block gap increased from 16px to 40px. Error WCEnd blocks added to console and SDL3 templates with error-hook connections.

Commit log

e879e21 fix: variable blocks no longer emit labels; remove default array variable
7451def fix: double return 0 in generated C output
439cc6e feat: loop support via goto labels on each block
f1eed2d refactor: extract pure codegen into shared module, remove duplication
9dd79c2 chore: remove stale test-compile.js
8522ece test: C compilation tests for generated template code
3657a22 fix: WCEnd editor modal pre-loads correct colour and errno value
68da559 refactor: unwrap nested if-else in error-path code generation
5caa306 fix: prevent deletion of library procedures

File inventory (key files)

File	Lines	Notes
`codegen/index.js`	~150	Pure codegen module, shared browser+Node
`blocks-proc.js`	~600	ProcCall with codegen delegation
`blocks-algo.js`	~560	Decision/End blocks with label support
`wcblock.js`	~330	Base class with _isFlowBlock, label/goto
`wcprogram.js`	~300	Double-return guard
`tests/compile/run.js`	~230	Compilation tests using CodeGen module
`tests/compile/Makefile`	~40	pkg-config based build
`tests/app/test-runner.js`	~845	Browser tests
`shell.nix`	~56	Added gcc, mesa
`style.css`	~1340	Warning icon padding fix

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