[EH] Fuzz throws from JS (#7027)

We already generated (throw ..) instructions in wasm, but it makes sense to model
throws from outside as well, as they cross the module boundary. This adds a new fuzzer
import to the generated modules, "throw", that just does a throw from JS etc.

Also be more precise about handling fuzzing-support imports in fuzz-exec: we now
check that logging functions start with "log*" and error otherwise (this check is
now needed given we have "throw", which is not logging). Also fix a minor issue
with name conflicts for logging functions by using getValidFunctionName for them,
both for logging and for throw.

1 files changed, 3 insertions, 3 deletions

diff --git a/test/passes/simplify-locals_all-features_disable-exception-handling.wast b/test/passes/simplify-locals_all-features_disable-exception-handling.wast
index 0fc110696..44c31e344 100644
--- a/test/passes/simplify-locals_all-features_disable-exception-handling.wast
+++ b/test/passes/simplify-locals_all-features_disable-exception-handling.wast
@@ -1194,9 +1194,9 @@
   (type $4 (func (param i32)))
   (type $5 (func (param i32) (result i32)))
   (type $6 (func (param i32 i32 i32 i32 i32 i32)))
-  (import "fuzzing-support" "log1" (func $fimport$0 (result i32)))
-  (import "fuzzing-support" "log2" (func $fimport$1 (param i32)))
-  (import "fuzzing-support" "log3" (func $fimport$2 (param f32)))
+  (import "env" "get1" (func $fimport$0 (result i32)))
+  (import "fuzzing-support" "log-i32" (func $fimport$1 (param i32)))
+  (import "fuzzing-support" "log-f32" (func $fimport$2 (param f32)))
   (memory 256 256 shared)
   (global $global$0 (mut i32) (i32.const 10))
   (func $nonatomics (result i32) ;; loads are reordered