compiler: test traps report correct line numbers (#1528)

Signed-off-by: Nuno Cruces <ncruces@users.noreply.github.com>

Makefile

@@ -62,7 +62,7 @@ build.examples.tinygo: $(tinygo_sources)
 
 # We use zig to build C as it is easy to install and embeds a copy of zig-cc.
 # Note: Don't use "-Oz" as that breaks our wasi sock example.
-c_sources := imports/wasi_snapshot_preview1/example/testdata/zig-cc/cat.c imports/wasi_snapshot_preview1/testdata/zig-cc/wasi.c
+c_sources := imports/wasi_snapshot_preview1/example/testdata/zig-cc/cat.c imports/wasi_snapshot_preview1/testdata/zig-cc/wasi.c internal/testing/dwarftestdata/testdata/zig-cc/main.c
 .PHONY: build.examples.zig-cc
 build.examples.zig-cc: $(c_sources)
 	@for f in $^; do \

dwarf_test.go

@@ -88,6 +88,18 @@ wasm stack trace:
 	._start()
 		0x6a: /start.zig:609:37 (inlined)
 		      /start.zig:224:5`,
+				},
+				{
+					name: "cc",
+					bin:  dwarftestdata.ZigCCWasm,
+					exp: `module[] function[_start] failed: wasm error: unreachable
+wasm stack trace:
+	.a()
+		0x312: /main.c:7:18
+	.__original_main() i32
+		0x47c: /main.c:11:3
+	._start()
+	._start.command_export()`,
 				},
 				{
 					name: "rust",

internal/testing/dwarftestdata/data.go

@@ -19,6 +19,9 @@ var TinyGoWasm []byte
 //go:embed testdata/zig/main.wasm
 var ZigWasm []byte
 
+//go:embed testdata/zig-cc/main.wasm
+var ZigCCWasm []byte
+
 // RustWasm comes with huge DWARF sections, so we do not check it in directly,
 // but instead xz-compressed one is.
 var RustWasm []byte

internal/testing/dwarftestdata/testdata/zig-cc/main.c

@@ -0,0 +1,13 @@
+volatile int base = 65536;
+
+void a() {
+  char str[16];
+  str[4] = 'a';
+  str[8] = 'b';
+  str[12 + base] = 'c';  // This traps.
+}
+
+int main() {
+  a();
+  return 0;
+}