add wasm-abi field in TargetSpec && set generic for WASI by default

builder/build.go

@@ -79,7 +79,7 @@ func Build(pkgName, outpath string, config *compileopts.Config, action func(Buil
 	// keep functions interoperable, pass int64 types as pointers to
 	// stack-allocated values.
 	// Use -wasm-abi=generic to disable this behaviour.
-	if config.Options.WasmAbi == "js" && strings.HasPrefix(config.Triple(), "wasm") {
+	if config.WasmAbi() == "js" {
 		err := transform.ExternalInt64AsPtr(mod)
 		if err != nil {
 			return err

compileopts/config.go

@@ -329,6 +329,15 @@ func (c *Config) RelocationModel() string {
 	return "static"
 }
 
+// WasmAbi returns the WASM ABI which is specified in the target JSON file, and
+// the value is overridden by `-wasm-abi` flag if it is provided
+func (c *Config) WasmAbi() string {
+	if c.Options.WasmAbi != "" {
+		return c.Options.WasmAbi
+	}
+	return c.Target.WasmAbi
+}
+
 type TestConfig struct {
 	CompileTestBinary bool
 	// TODO: Filter the test functions to run, include verbose flag, etc

compileopts/target.go

@@ -55,6 +55,7 @@ type TargetSpec struct {
 	JLinkDevice      string   `json:"jlink-device"`
 	CodeModel        string   `json:"code-model"`
 	RelocationModel  string   `json:"relocation-model"`
+	WasmAbi          string   `json:"wasm-abi"`
 }
 
 // overrideProperties overrides all properties that are set in child into itself using reflection.

main.go

@@ -816,7 +816,7 @@ func main() {
 	programmer := flag.String("programmer", "", "which hardware programmer to use")
 	cFlags := flag.String("cflags", "", "additional cflags for compiler")
 	ldFlags := flag.String("ldflags", "", "additional ldflags for linker")
-	wasmAbi := flag.String("wasm-abi", "js", "WebAssembly ABI conventions: js (no i64 params) or generic")
+	wasmAbi := flag.String("wasm-abi", "", "WebAssembly ABI conventions: js (no i64 params) or generic")
 	heapSize := flag.String("heap-size", "1M", "default heap size in bytes (only supported by WebAssembly)")
 
 	var flagJSON, flagDeps *bool

main_test.go

@@ -162,11 +162,7 @@ func runTest(path, target string, t *testing.T) {
 		VerifyIR:   true,
 		Debug:      true,
 		PrintSizes: "",
-		WasmAbi:    "js",
-	}
-
-	if target == "wasi" {
-		config.WasmAbi = "generic"
+		WasmAbi:    "",
 	}
 
 	binary := filepath.Join(tmpdir, "test")

targets/wasi.json

@@ -18,5 +18,6 @@
 		"--no-demangle",
 		"{root}/lib/wasi-libc/sysroot/lib/wasm32-wasi/libc.a"
 	],
-	"emulator":      ["wasmtime"]
+	"emulator":      ["wasmtime"],
+	"wasm-abi":      "generic"
 }

targets/wasm.json

@@ -17,5 +17,6 @@
 		"--no-demangle",
 		"{root}/lib/wasi-libc/sysroot/lib/wasm32-wasi/libc.a"
 	],
-	"emulator":      ["node", "targets/wasm_exec.js"]
+	"emulator":      ["node", "targets/wasm_exec.js"],
+	"wasm-abi":      "js"
 }