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closures with captures: env struct + global instance + body rewriting

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- AST: captureCount + captureName0..7 + captureType0..7 in Expr
- Sema: Scope_LookupUpTo + closureScope for capture analysis
- HIR Lower: env struct generation, capture assignments in skLet,
  body rewriting (ekIdent -> hFieldAccess on env instance)
- C Backend: env struct def + global instance emission for closures
- Bootstrap: full capture support in sema, hir_lower, lir_lower, lir_c_backend
- Selfhost loop remains deterministic
This commit is contained in:
dimgigov
2026-06-09 21:23:05 +03:00
parent ba54aa240e
commit 9b473c667c
17 changed files with 5267 additions and 53 deletions
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src/c_backend.bux
+45
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@@ -445,6 +445,14 @@ func CBE_EmitExpr(cbe: *CEmitter, node: *HirNode) {
return;
}
// Field access on value (direct dot): obj.field
if kind == hFieldAccess {
CBE_EmitExpr(cbe, node.child1);
StringBuilder_Append(&cbe.sb, ".");
StringBuilder_Append(&cbe.sb, node.strValue);
return;
}
// Field access: obj.field — use -> if base is pointer, else .
if kind == hFieldPtr {
CBE_EmitExpr(cbe, node.child1);
@@ -1042,6 +1050,43 @@ func CBackend_Generate(mod: *HirModule) -> String {
i = i + 1;
continue;
}
// Emit env struct and global instance for closures with captures
if mod.funcs[i].captureCount > 0 {
let envName: String = mod.funcs[i].envStructName;
let instName: String = mod.funcs[i].envInstanceName;
if !String_Eq(envName, "") {
// Emit struct definition
StringBuilder_Append(&cbe.sb, "struct ");
StringBuilder_Append(&cbe.sb, envName);
StringBuilder_Append(&cbe.sb, " {\n");
var ci: int = 0;
while ci < mod.funcs[i].captureCount {
var capName: String = "";
var capType: String = "int";
if ci == 0 { capName = mod.funcs[i].captureName0; capType = CBackend_TypeToC(mod.funcs[i].captureType0); }
else if ci == 1 { capName = mod.funcs[i].captureName1; capType = CBackend_TypeToC(mod.funcs[i].captureType1); }
else if ci == 2 { capName = mod.funcs[i].captureName2; capType = CBackend_TypeToC(mod.funcs[i].captureType2); }
else if ci == 3 { capName = mod.funcs[i].captureName3; capType = CBackend_TypeToC(mod.funcs[i].captureType3); }
else if ci == 4 { capName = mod.funcs[i].captureName4; capType = CBackend_TypeToC(mod.funcs[i].captureType4); }
else if ci == 5 { capName = mod.funcs[i].captureName5; capType = CBackend_TypeToC(mod.funcs[i].captureType5); }
else if ci == 6 { capName = mod.funcs[i].captureName6; capType = CBackend_TypeToC(mod.funcs[i].captureType6); }
else if ci == 7 { capName = mod.funcs[i].captureName7; capType = CBackend_TypeToC(mod.funcs[i].captureType7); }
StringBuilder_Append(&cbe.sb, " ");
StringBuilder_Append(&cbe.sb, capType);
StringBuilder_Append(&cbe.sb, " ");
StringBuilder_Append(&cbe.sb, capName);
StringBuilder_Append(&cbe.sb, ";\n");
ci = ci + 1;
}
StringBuilder_Append(&cbe.sb, "};\n");
// Emit global instance
StringBuilder_Append(&cbe.sb, "static struct ");
StringBuilder_Append(&cbe.sb, envName);
StringBuilder_Append(&cbe.sb, " ");
StringBuilder_Append(&cbe.sb, instName);
StringBuilder_Append(&cbe.sb, ";\n\n");
}
}
CBE_EmitFuncDecl(cbe, &mod.funcs[i]);
StringBuilder_Append(&cbe.sb, " {\n");
// Body