postgres: fix stage 2 self-hosting regression via minimal src surface

step 2 added a usesPostgres field to LLVMGenerator plus a cs_pg_ prefix
check in generateExternDeclaration plus a trailing-return workaround in
parser-native/transformer.ts. any of those shifted enough state that the
native stage 1 compiler began miscompiling generateGlobalVariableDeclarations
— storing a pointer into a double slot for isClassInstance. --quick
skipped stage 2 so it passed local verify but failed CI.

fix: do the -lpq/pg-bridge.o detection entirely in compiler.ts and
native-compiler-lib.ts by walking generator.declaredExternFunctions for
anything starting with cs_pg_. no changes to llvm-generator.ts,
generator-context.ts, or parser-native/transformer.ts. feature is
functionally identical end-to-end (verified against local postgres).

npm run verify (full, including stage 2) is green on this commit.

Author: cs01

src/codegen/infrastructure/generator-context.ts

@@ -800,8 +800,6 @@ export interface IGeneratorContext {
   getUsesTimers(): boolean;
   setUsesTreeSitter(value: boolean): void;
   setUsesSqlite(value: boolean): void;
-  setUsesPostgres(value: boolean): void;
-  getUsesPostgres(): boolean;
   setUsesCurl(value: boolean): void;
   setUsesOs(value: boolean): void;
   setUsesUvHrtime(value: boolean): void;
@@ -1036,7 +1034,6 @@ export class MockGeneratorContext implements IGeneratorContext {
   public usesPromises: number = 0;
   public usesTimers: number = 0;
   public usesSqlite: number = 0;
-  public usesPostgres: number = 0;
   public usesCurl: number = 0;
   public usesUvHrtime: number = 0;
   public usesCrypto: number = 0;
@@ -1241,12 +1238,6 @@ export class MockGeneratorContext implements IGeneratorContext {
   setUsesSqlite(value: boolean): void {
     this.usesSqlite = value ? 1 : 0;
   }
-  setUsesPostgres(value: boolean): void {
-    this.usesPostgres = value ? 1 : 0;
-  }
-  getUsesPostgres(): boolean {
-    return this.usesPostgres !== 0;
-  }
   setUsesCurl(value: boolean): void {
     this.usesCurl = value ? 1 : 0;
   }

src/codegen/llvm-generator.ts

@@ -265,7 +265,6 @@ export class LLVMGenerator extends BaseGenerator implements IGeneratorContext {
   public usesStringBuilder: number = 0;
   public usesLLVM: number = 0;
   public usesLLD: number = 0;
-  public usesPostgres: number = 0;
   public usesCompression: number = 0;
   public usesYaml: number = 0;
   private stringBuilderSlen: Map<string, string> = new Map();
@@ -993,12 +992,6 @@ export class LLVMGenerator extends BaseGenerator implements IGeneratorContext {
   public getUsesLLD(): boolean {
     return this.usesLLD !== 0;
   }
-  public setUsesPostgres(value: boolean): void {
-    this.usesPostgres = value ? 1 : 0;
-  }
-  public getUsesPostgres(): boolean {
-    return this.usesPostgres !== 0;
-  }
   public setUsesCompression(value: boolean): void {
     this.usesCompression = value ? 1 : 0;
   }
@@ -1415,7 +1408,6 @@ export class LLVMGenerator extends BaseGenerator implements IGeneratorContext {
     this.usesAsyncFs = 0;
     this.usesGC = 0;
     this.usesMathRandom = 0;
-    this.usesPostgres = 0;
 
     this.ast = ast;
 
@@ -3387,7 +3379,6 @@ export class LLVMGenerator extends BaseGenerator implements IGeneratorContext {
     this.declaredExternFunctions.push(func.name);
     if (func.name.startsWith("cs_llvm_")) this.usesLLVM = 1;
     if (func.name.startsWith("cs_lld_")) this.usesLLD = 1;
-    if (func.name.startsWith("cs_pg_")) this.usesPostgres = 1;
     return `declare ${retType} @${func.name}(${paramLlvmTypes.join(", ")})\n`;
   }
 

src/compiler.ts

@@ -406,7 +406,14 @@ export function compile(
   if (generator.usesSqlite) {
     linkLibs += " -lsqlite3";
   }
-  if (generator.usesPostgres) {
+  let usesPostgres = false;
+  for (let i = 0; i < generator.declaredExternFunctions.length; i++) {
+    if (generator.declaredExternFunctions[i].startsWith("cs_pg_")) {
+      usesPostgres = true;
+      break;
+    }
+  }
+  if (usesPostgres) {
     linkLibs += " -lpq";
   }
   if (generator.usesHttpServer) {
@@ -433,7 +440,7 @@ export function compile(
     if (generator.usesSqlite) {
       linkLibs = `-L${brewPrefix}/sqlite/lib ` + linkLibs;
     }
-    if (generator.usesPostgres) {
+    if (usesPostgres) {
       linkLibs = `-L${brewPrefix}/libpq/lib ` + linkLibs;
     }
     if (generator.usesHttpServer || generator.usesCompression) {
@@ -464,7 +471,7 @@ export function compile(
   const arenaBridgeObj = `${bridgePath}/arena-bridge.o`;
   const cpSpawnObj = generator.getUsesSpawn() ? `${bridgePath}/child-process-spawn.o` : "";
   const curlBridgeObj = generator.usesCurl ? `${bridgePath}/curl-bridge.o` : "";
-  const pgBridgeObj = generator.usesPostgres ? `${bridgePath}/pg-bridge.o` : "";
+  const pgBridgeObj = usesPostgres ? `${bridgePath}/pg-bridge.o` : "";
   const compressBridgeObj = generator.usesCompression ? `${bridgePath}/compress-bridge.o` : "";
   const yamlBridgeObj = generator.usesYaml ? `${bridgePath}/yaml-bridge.o` : "";
   let extraObjs = "";

src/native-compiler-lib.ts

@@ -664,7 +664,14 @@ export function compileNative(inputFile: string, outputFile: string): void {
   if (generator.getUsesSqlite()) {
     linkLibs = "-lsqlite3 " + linkLibs;
   }
-  if (generator.getUsesPostgres()) {
+  let usesPostgres: boolean = false;
+  for (let i = 0; i < generator.declaredExternFunctions.length; i++) {
+    if (generator.declaredExternFunctions[i].startsWith("cs_pg_")) {
+      usesPostgres = true;
+      break;
+    }
+  }
+  if (usesPostgres) {
     linkLibs = "-lpq " + linkLibs;
   }
   if (generator.getUsesHttpServer()) {
@@ -698,7 +705,7 @@ export function compileNative(inputFile: string, outputFile: string): void {
   const arenaBridgeObj = effectiveBridgePath + "/arena-bridge.o";
   const cpSpawnObj = generator.getUsesSpawn() ? effectiveBridgePath + "/child-process-spawn.o" : "";
   const curlBridgeObj = generator.getUsesCurl() ? effectiveBridgePath + "/curl-bridge.o" : "";
-  const pgBridgeObj = generator.getUsesPostgres() ? effectiveBridgePath + "/pg-bridge.o" : "";
+  const pgBridgeObj = usesPostgres ? effectiveBridgePath + "/pg-bridge.o" : "";
   const compressBridgeObj = generator.getUsesCompression()
     ? effectiveBridgePath + "/compress-bridge.o"
     : "";
@@ -825,7 +832,7 @@ export function compileNative(inputFile: string, outputFile: string): void {
         if (fs.existsSync("/usr/local/opt/sqlite/lib"))
           linkLibs = "-L/usr/local/opt/sqlite/lib " + linkLibs;
       }
-      if (generator.getUsesPostgres()) {
+      if (usesPostgres) {
         if (fs.existsSync("/opt/homebrew/opt/libpq/lib"))
           linkLibs = "-L/opt/homebrew/opt/libpq/lib " + linkLibs;
         if (fs.existsSync("/usr/local/opt/libpq/lib"))
@@ -906,7 +913,7 @@ export function compileNative(inputFile: string, outputFile: string): void {
         if (fs.existsSync("/usr/local/opt/sqlite/lib"))
           linkLibs = "-L/usr/local/opt/sqlite/lib " + linkLibs;
       }
-      if (generator.getUsesPostgres()) {
+      if (usesPostgres) {
         if (fs.existsSync("/opt/homebrew/opt/libpq/lib"))
           linkLibs = "-L/opt/homebrew/opt/libpq/lib " + linkLibs;
         if (fs.existsSync("/usr/local/opt/libpq/lib"))

src/parser-native/transformer.ts

@@ -614,7 +614,6 @@ function transformExpression(node: TreeSitterNode): Expression {
     default:
       return { type: "variable", name: "undefined" };
   }
-  return { type: "variable", name: "undefined" };
 }
 
 // ============================================