wasm-decompile: add function index comments (#2482)

Author: python273

src/decompiler.cc

@@ -826,9 +826,9 @@ struct Decompiler {
         }
       }
       if (is_import) {
-        s += ";";
+        s += cat("; // func", std::to_string(func_index));
       } else {
-        s += " {\n";
+        s += cat(" { // func", std::to_string(func_index), "\n");
         auto val = DecompileExpr(ast.exp_stack[0], nullptr);
         IndentValue(val, indent_amount, {});
         for (auto& stat : val.v) {

test/decompile/basic.txt

@@ -149,9 +149,9 @@ data d_abcdefghijklmnoqrstuvwxyzabc(offset: 100) =
 data d_c(offset: 200) = "hi";
 data d_d(offset: 300) = "Hello, World!\0a\00";
 
-import function ns_fi();
+import function ns_fi(); // func0
 
-export function f(a:int, b:int):int {
+export function f(a:int, b:int):int { // func1
   var c:long = 8L;
   var d:float = 6.0f;
   var e:double = 7.0;
@@ -191,7 +191,7 @@ export function f(a:int, b:int):int {
   return 0;
 }
 
-function f_c() {
+function f_c() { // func2
   var a:int;
   loop L_a {
     a = 1;
@@ -200,13 +200,13 @@ function f_c() {
   a;
 }
 
-function signature() {
+function signature() { // func3
 }
 
-function signature_1() {
+function signature_1() { // func4
 }
 
-function f_f() {
+function f_f() { // func5
 }
 
 ;;; STDOUT ;;)

test/decompile/code-metadata.txt

@@ -8,7 +8,7 @@
     return))
 
 (;; STDOUT ;;;
-function f_a(a:int):int {
+function f_a(a:int):int { // func0
   let t0 = a;
   // @metadata.code.test "aa\01a";
   return 1234 + t0;

test/decompile/loadstore.txt

@@ -110,7 +110,7 @@ memory M_a(initial: 1, max: 0);
 
 data d_HelloWorld(offset: 10) = "Hello, World!\0a\00";
 
-export function f(a:{ a:float, b:float }, b:{ a:ushort, b:long }) {
+export function f(a:{ a:float, b:float }, b:{ a:ushort, b:long }) { // func0
   var c:{ a:float, b:float }
   var d:{ a:ushort, b:long }
   var e:int;

test/decompile/names.txt

@@ -99,18 +99,18 @@ export global G1_EXPORT:int = 0;
 data D0_SYM(offset: 0) = "Hello, World!";
 data D1_SYM(offset: 10) = "bar";
 
-function F0():int {
+function F0():int { // func0
   var L0:int;
   return L0;
 }
 
-function F1_NS() {
+function F1_NS() { // func1
 }
 
-function F2_SYM() {
+function F2_SYM() { // func2
 }
 
-export function F3_EXPORT() {
+export function F3_EXPORT() { // func3
 }
 
 ;;; STDOUT ;;)

test/decompile/precedence.txt

@@ -39,7 +39,7 @@
 (;; STDOUT ;;;
 memory M_a(initial: 1, max: 0);
 
-export function precedence() {
+export function precedence() { // func0
   0[0]:int * 1 + 2 << 3 == 4 & 5;
   (((((6 & 5) == 4) << 3) + 2) * 1)[0]:int;
 }

test/decompile/stack-flush.txt

@@ -50,7 +50,7 @@
 (;; STDOUT ;;;
 memory M_a(initial: 1, max: 0);
 
-export function f(a:int, b:int):int {
+export function f(a:int, b:int):int { // func0
   let t0 = s();
   s();
   let t1, t2 = s(), s();
@@ -70,11 +70,11 @@ export function f(a:int, b:int):int {
   return t7 == t8;
 }
 
-export function s():int {
+export function s():int { // func1
   return 1
 }
 
-export function mv():(int, int) {
+export function mv():(int, int) { // func2
   return 1, 2
 }
 

test/regress/regress-1922.txt

@@ -9,7 +9,7 @@
       i32.add
     end))
 (;; STDOUT ;;;
-function f_a(a:int, b:int):int {
+function f_a(a:int, b:int):int { // func0
   a + br_table[L_a, ..L_a](unreachable);
   return loop L_a {
          }

test/regress/regress-1924.txt

@@ -9,7 +9,7 @@
 (;; STDOUT ;;;
 export global __empty:long = 8L;
 
-function f_a():long {
+function f_a():long { // func0
   return __empty
 }