Use 3 modes for potentially trapping ops in asm2wasm (#929)

* use 3 modes for potentially trapping ops in asm2wasm: allow (just emit a potentially trapping op), js (do exactly what js does, even if it takes a slow ffi to do it), and clamp (avoid the trap by clamping as necessary)

1 files changed, 23 insertions, 0 deletions

diff --git a/test/importedSignCast.fromasm.clamp.no-opts b/test/importedSignCast.fromasm.clamp.no-opts
new file mode 100644
index 000000000..97f1f82b7
--- /dev/null
+++ b/test/importedSignCast.fromasm.clamp.no-opts
@@ -0,0 +1,23 @@
+(module
+  (type $FUNCSIG$ii (func (param i32) (result i32)))
+  (import "env" "_emscripten_glIsTexture" (func $gm (param i32) (result i32)))
+  (import "env" "memory" (memory $0 256 256))
+  (import "env" "table" (table 1 1 anyfunc))
+  (import "env" "memoryBase" (global $memoryBase i32))
+  (import "env" "tableBase" (global $tableBase i32))
+  (elem (get_global $tableBase) $gm)
+  (export "func" (func $func))
+  (func $func
+    (drop
+      (i32.shr_s
+        (i32.shl
+          (call $gm
+            (i32.const 0)
+          )
+          (i32.const 24)
+        )
+        (i32.const 24)
+      )
+    )
+  )
+)