The native x86-64 backend is now the default (bkNative). QBE remains
available via --backend qbe. Several codegen bugs that were invisible
while QBE was the default are fixed in this commit:
Native backend fixes:
- EmitLeaqGlobal helper: threadvar globals now emit the correct
fs:0 + @tpoff TLS sequence instead of bare %rip-relative leaq.
Fixes static array write (FreeLists), string subscript assignment,
EmitExprAddr, record memcpy, method-ptr cast, and open-array push
paths that all used raw leaq %s(%rip).
- EmitIncDec: unified local/global paths through VarOperand so
threadvar scalar Inc/Dec (e.g. LargeFreeCount) gets TLS addressing.
- EmitIncDec FAE.Base: Inc(P^.Field) where P is a pointer now
evaluates the base expression instead of leaq on the stack slot.
- FinalizeEmit: data section (.data/.bss/.rodata) now emits once at
the end of unit compilation via FinalizeEmit, not inside each
EmitUnit call. Fixes duplicate/missing string literals in sep-compile.
- EmitFunctionDef AExported: implementation-only helpers in monolithic
mode stay file-local (.globl suppressed) to avoid symbol collisions
with the RTL archive.
QBE backend fixes:
- AppendUnit typeinfo: export prefix added to data $typeinfo_TObject,
$typeinfo_TCustomAttribute, $vtable_TObject, $vtable_TCustomAttribute
so native-built RTL can resolve them.
- FSuppressSystemDefs: decoupled from FExportAll so CreateUnitCodeGen
can export all symbols without suppressing system defs.
Infrastructure:
- runtime/Makefile: BLAISE_FLAGS variable for passing extra compiler
flags (e.g. --backend qbe) from build scripts.
- fixpoint.sh: make clean before RTL rebuild to pick up backend change.
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