Implement Exception Handling for classic interpreter

build-scripts/config_common.cmake

@@ -335,6 +335,11 @@ if (WAMR_BUILD_REF_TYPES EQUAL 1)
 else ()
   message ("     Reference types disabled")
 endif ()
+if (WAMR_BUILD_EXCE_HANDLING EQUAL 1)
+  add_definitions (-DWASM_ENABLE_EXCE_HANDLING=1)
+  add_definitions (-DWASM_ENABLE_TAGS=1)
+  message ("     Exception Handling enabled")
+endif ()
 if (DEFINED WAMR_BH_VPRINTF)
   add_definitions (-DBH_VPRINTF=${WAMR_BH_VPRINTF})
 endif ()

core/config.h

@@ -457,6 +457,14 @@
 #define WASM_ENABLE_REF_TYPES 0
 #endif
 
+#ifndef WASM_ENABLE_EXCE_HANDLING
+#define WASM_ENABLE_EXCE_HANDLING 0
+#endif
+
+#ifndef WASM_ENABLE_TAGS
+#define WASM_ENABLE_TAGS 0
+#endif
+
 #ifndef WASM_ENABLE_SGX_IPFS
 #define WASM_ENABLE_SGX_IPFS 0
 #endif

core/iwasm/interpreter/wasm.h

@@ -65,6 +65,9 @@ extern "C" {
 #if WASM_ENABLE_BULK_MEMORY != 0
 #define SECTION_TYPE_DATACOUNT 12
 #endif
+#if WASM_ENABLE_TAGS != 0
+#define SECTION_TYPE_TAG 13
+#endif
 
 #define SUB_SECTION_TYPE_MODULE 0
 #define SUB_SECTION_TYPE_FUNC 1
@@ -74,20 +77,34 @@ extern "C" {
 #define IMPORT_KIND_TABLE 1
 #define IMPORT_KIND_MEMORY 2
 #define IMPORT_KIND_GLOBAL 3
+#if WASM_ENABLE_TAGS != 0
+#define IMPORT_KIND_TAG 4
+#endif
 
 #define EXPORT_KIND_FUNC 0
 #define EXPORT_KIND_TABLE 1
 #define EXPORT_KIND_MEMORY 2
 #define EXPORT_KIND_GLOBAL 3
+#if WASM_ENABLE_TAGS != 0
+#define EXPORT_KIND_TAG 4
+#endif
 
 #define LABEL_TYPE_BLOCK 0
 #define LABEL_TYPE_LOOP 1
 #define LABEL_TYPE_IF 2
 #define LABEL_TYPE_FUNCTION 3
+#if WASM_ENABLE_EXCE_HANDLING != 0
+#define LABEL_TYPE_TRY 4
+#define LABEL_TYPE_CATCH 5
+#define LABEL_TYPE_CATCH_ALL 6
+#endif
 
 typedef struct WASMModule WASMModule;
 typedef struct WASMFunction WASMFunction;
 typedef struct WASMGlobal WASMGlobal;
+#if WASM_ENABLE_TAGS != 0
+typedef struct WASMTag WASMTag;
+#endif
 
 typedef union V128 {
     int8 i8x16[16];
@@ -201,6 +218,24 @@ typedef struct WASMFunctionImport {
     bool call_conv_wasm_c_api;
 } WASMFunctionImport;
 
+#if WASM_ENABLE_TAGS != 0
+typedef struct WASMTagImport {
+    char *module_name;
+    char *field_name;
+    uint8 attribute; /* the type of the tag (numerical) */
+    uint32 type;     /* the type of the catch function (numerical)*/
+    WASMType *tag_type;
+    void *tag_ptr_linked;
+
+#if WASM_ENABLE_MULTI_MODULE != 0
+    /* imported tag  pointer after linked */
+    WASMModule *import_module;
+    WASMTag *import_tag_linked;
+    uint32 import_tag_index_linked;
+#endif
+} WASMTagImport;
+#endif
+
 typedef struct WASMGlobalImport {
     char *module_name;
     char *field_name;
@@ -227,6 +262,9 @@ typedef struct WASMImport {
         WASMFunctionImport function;
         WASMTableImport table;
         WASMMemoryImport memory;
+#if WASM_ENABLE_TAGS != 0
+        WASMTagImport tag;
+#endif
         WASMGlobalImport global;
         struct {
             char *module_name;
@@ -265,6 +303,10 @@ struct WASMFunction {
     uint32 const_cell_num;
 #endif
 
+#if WASM_ENABLE_EXCE_HANDLING != 0
+    uint32 exception_handler_count;
+#endif
+
 #if WASM_ENABLE_FAST_JIT != 0 || WASM_ENABLE_JIT != 0 \
     || WASM_ENABLE_WAMR_COMPILER != 0
     /* Whether function has opcode memory.grow */
@@ -294,6 +336,14 @@ struct WASMFunction {
 #endif
 };
 
+#if WASM_ENABLE_TAGS != 0
+struct WASMTag {
+    uint8 attribute; /* the attribute property of the tag (expected to be 0) */
+    uint32 type; /* the type of the tag (expected valid inden in type table) */
+    WASMType *tag_type;
+};
+#endif
+
 struct WASMGlobal {
     uint8 type;
     bool is_mutable;
@@ -420,6 +470,9 @@ struct WASMModule {
     uint32 function_count;
     uint32 table_count;
     uint32 memory_count;
+#if WASM_ENABLE_TAGS != 0
+    uint32 tag_count;
+#endif
     uint32 global_count;
     uint32 export_count;
     uint32 table_seg_count;
@@ -433,18 +486,27 @@ struct WASMModule {
     uint32 import_function_count;
     uint32 import_table_count;
     uint32 import_memory_count;
+#if WASM_ENABLE_TAGS != 0
+    uint32 import_tag_count;
+#endif
     uint32 import_global_count;
 
     WASMImport *import_functions;
     WASMImport *import_tables;
     WASMImport *import_memories;
+#if WASM_ENABLE_TAGS != 0
+    WASMImport *import_tags;
+#endif
     WASMImport *import_globals;
 
     WASMType **types;
     WASMImport *imports;
     WASMFunction **functions;
     WASMTable *tables;
     WASMMemory *memories;
+#if WASM_ENABLE_TAGS != 0
+    WASMTag **tags;
+#endif
     WASMGlobal *globals;
     WASMExport *exports;
     WASMTableSeg *table_segments;
@@ -628,6 +690,11 @@ typedef struct WASMBranchBlock {
     uint8 *target_addr;
     uint32 *frame_sp;
     uint32 cell_num;
+#if WASM_ENABLE_EXCE_HANDLING != 0
+    /* in exception handling, label_type needs to be stored to lookup exception
+     * handlers */
+    uint8 label_type;
+#endif
 } WASMBranchBlock;
 
 /**

core/iwasm/interpreter/wasm_interp.h

@@ -34,6 +34,14 @@ typedef struct WASMInterpFrame {
     uint64 time_started;
 #endif
 
+#if WASM_ENABLE_EXCE_HANDLING != 0
+    /* set to true if the callee returns an exception rather than
+     * result values on the stack
+     */
+    bool exception_raised;
+    uint32 tag_index;
+#endif
+
 #if WASM_ENABLE_FAST_INTERP != 0
     /* Return offset of the first return value of current frame,
        the callee will put return values here continuously */