C: sqlite hits unsupported AN_TERNARY during IR lowering

• Type: bug (C frontend / IR lowering) — Track C
• Status: done
• Owner: Track CA
• Found / Opened: 2026-06-27, M5 sqlite bring-up ([[feature-c-desktop-lua-sqlite-path]]), after getpid and ternary-middle comma parsing were fixed.
• Closed: 2026-06-27

Symptom

sqlite stopped at:

Unsupported linear node in IR codegen! Kind=10 node=2794 IRA=67 IRB=100111 IRC=100114 IRIVal=0
pascal26:56919: error: Unsupported linear node in IR codegen ()

Kind=10 is IR_UNSUPPORTED; IRA=67 is AN_TERNARY.

Reduction

The failing source was in balance_nonroot:

MemPage *pOld = (nNew>nOld ? apNew : apOld)[nOld-1];

apNew and apOld are local arrays of MemPage *. C decays the selected ternary arm to a pointer value, then indexes that pointer.

Cause

IRLowerAddress(AN_INDEX) handled simple pointer bases and nested pointer indexing, but not computed pointer-value bases like AN_TERNARY. The generic array/index path called IRLowerAddress(base), which asked for the address of the non-lvalue ternary expression and produced IR_UNSUPPORTED.

The parser also did not propagate pointer depth/base/pointee metadata through pointer-valued ternary nodes, so even after address lowering was fixed, nested indexing or field resolution could lose the selected pointer's element type.

Fix

In C mode, IRLowerAddress(AN_INDEX) now recognizes computed pointer-value bases and uses IRLowerAST(base) as the base pointer value, scaled by IRPointerStride(base).

CNodePtrDepth, CNodePtrBaseTk, and CNodePointeeTk now preserve pointer metadata through AN_TERNARY nodes by selecting the pointer-decaying arm.

Regression

Added test/cternary_pointer_array_index_b103.c, wired into make test-core.

Result

sqlite advances to the next parser wall:

char saveBuf[(sizeof(Parse)-((size_t)&(((Parse *)0)->sLastToken)))];

Filed [[bug-c-sqlite-offsetof-style-field-address-array-bound]].