[wasm] Improve trap messages

Especially "invalid function" and "invalid type" could contain much
more information.

Drive-by: Remove unused WasmTrapInvalidIndex.

R=ahaas@chromium.org

Change-Id: I7fd72c095eaad94e3e2d9bfe6ab4a9ce0bb4798b
Reviewed-on: https://chromium-review.googlesource.com/897526
Reviewed-by: Andreas Haas <ahaas@chromium.org>
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#51059}

src/messages.h

@@ -723,11 +723,10 @@ class ErrorUtils : public AllStatic {
   T(WasmTrapDivByZero, "divide by zero")                                       \
   T(WasmTrapDivUnrepresentable, "divide result unrepresentable")               \
   T(WasmTrapRemByZero, "remainder by zero")                                    \
-  T(WasmTrapFloatUnrepresentable, "integer result unrepresentable")            \
-  T(WasmTrapFuncInvalid, "invalid function")                                   \
+  T(WasmTrapFloatUnrepresentable, "float unrepresentable in integer range")    \
+  T(WasmTrapFuncInvalid, "invalid index into function table")                  \
   T(WasmTrapFuncSigMismatch, "function signature mismatch")                    \
-  T(WasmTrapInvalidIndex, "invalid index into function table")                 \
-  T(WasmTrapTypeError, "invalid type")                                         \
+  T(WasmTrapTypeError, "wasm function signature contains illegal type")        \
   T(WasmExceptionError, "wasm exception")                                      \
   /* Asm.js validation related */                                              \
   T(AsmJsInvalid, "Invalid asm.js: %")                                         \

test/mjsunit/wasm/errors.js

@@ -160,15 +160,22 @@ function assertConversionError(bytes, imports, msg) {
 
 (function TestConversionError() {
   let b = builder();
-  b.addImport("foo", "bar", kSig_v_l);
-  assertConversionError(b.addFunction("run", kSig_v_v).addBody([
-    kExprI64Const, 0, kExprCallFunction, 0
-  ]).exportFunc().end().toBuffer(), {foo:{bar: (l)=>{}}}, "invalid type");
+  b.addImport('foo', 'bar', kSig_v_l);
+  let buffer = b.addFunction('run', kSig_v_v)
+                   .addBody([kExprI64Const, 0, kExprCallFunction, 0])
+                   .exportFunc()
+                   .end()
+                   .toBuffer();
+  assertConversionError(
+      buffer, {foo: {bar: (l) => {}}}, kTrapMsgs[kTrapTypeError]);
 
-  b = builder()
-  assertConversionError(builder().addFunction("run", kSig_l_v).addBody([
-    kExprI64Const, 0
-  ]).exportFunc().end().toBuffer(), {}, "invalid type");
+  buffer = builder()
+               .addFunction('run', kSig_l_v)
+               .addBody([kExprI64Const, 0])
+               .exportFunc()
+               .end()
+               .toBuffer();
+  assertConversionError(buffer, {}, kTrapMsgs[kTrapTypeError]);
 })();
 
 
@@ -178,7 +185,7 @@ function assertConversionError(bytes, imports, msg) {
   builder.addImport("mod", "func", sig);
   builder.addFunction("main", sig)
     .addBody([kExprGetLocal, 0, kExprGetLocal, 1, kExprCallFunction, 0])
-    .exportAs("main")
+    .exportAs("main");
   var main = builder.instantiate({
     mod: {
       func: ()=>{%DebugTrace();}

test/mjsunit/wasm/interpreter.js

@@ -296,7 +296,7 @@ function checkStack(stack, expected_lines) {
   } catch (e) {
     if (!(e instanceof TypeError)) throw e;
     checkStack(stripPath(e.stack), [
-      'TypeError: invalid type',                                // -
+      'TypeError: ' + kTrapMsgs[kTrapTypeError],                // -
       '    at direct (wasm-function[1]:1)',                     // -
       '    at main (wasm-function[3]:3)',                       // -
       /^    at testIllegalImports \(interpreter.js:\d+:22\)$/,  // -
@@ -309,7 +309,7 @@ function checkStack(stack, expected_lines) {
   } catch (e) {
     if (!(e instanceof TypeError)) throw e;
     checkStack(stripPath(e.stack), [
-      'TypeError: invalid type',                                // -
+      'TypeError: ' + kTrapMsgs[kTrapTypeError],                // -
       '    at indirect (wasm-function[2]:1)',                   // -
       '    at main (wasm-function[3]:3)',                       // -
       /^    at testIllegalImports \(interpreter.js:\d+:22\)$/,  // -

test/mjsunit/wasm/table-grow.js

@@ -286,7 +286,7 @@ let id = (() => {  // identity exported function
       assertInvalidFunction = function(s) {
         assertThrows(
             () => instances[i].exports.main(s), WebAssembly.RuntimeError,
-            /invalid function/);
+            kTrapMsgs[kTrapFuncInvalid]);
       }
       assertInvalidFunction(size);
       assertInvalidFunction(size + 1);

test/mjsunit/wasm/wasm-constants.js

@@ -374,7 +374,7 @@ let kTrapRemByZero            = 4;
 let kTrapFloatUnrepresentable = 5;
 let kTrapFuncInvalid          = 6;
 let kTrapFuncSigMismatch      = 7;
-let kTrapInvalidIndex         = 8;
+let kTrapTypeError            = 8;
 
 let kTrapMsgs = [
   "unreachable",
@@ -382,10 +382,10 @@ let kTrapMsgs = [
   "divide by zero",
   "divide result unrepresentable",
   "remainder by zero",
-  "integer result unrepresentable",
-  "invalid function",
+  "float unrepresentable in integer range",
+  "invalid index into function table",
   "function signature mismatch",
-  "invalid index into function table"
+  "wasm function signature contains illegal type"
 ];
 
 function assertTraps(trap, code) {