From 878558174888118f5b11199e8767cc62a691da2e Mon Sep 17 00:00:00 2001
From: Christine Dodrill <me@christine.website>
Date: Wed, 20 Jun 2018 07:58:19 -0700
Subject: [PATCH] cmd/land: add struct test

---
 cmd/land/process_test.go      |  34 ++++++++++++++++++++++++++++++++++
 cmd/land/testdata/Tupfile     |   7 +++++++
 cmd/land/testdata/arbint.c    |   7 +++++++
 cmd/land/testdata/arbint.wasm | Bin 0 -> 200 bytes
 cmd/land/testdata/struct.c    |  16 ++++++++++++++++
 cmd/land/testdata/struct.wasm | Bin 0 -> 235 bytes
 6 files changed, 64 insertions(+)
 create mode 100644 cmd/land/testdata/Tupfile
 create mode 100644 cmd/land/testdata/arbint.c
 create mode 100755 cmd/land/testdata/arbint.wasm
 create mode 100644 cmd/land/testdata/struct.c
 create mode 100755 cmd/land/testdata/struct.wasm

diff --git a/cmd/land/process_test.go b/cmd/land/process_test.go
index bbc939a..29d4c18 100644
--- a/cmd/land/process_test.go
+++ b/cmd/land/process_test.go
@@ -1,8 +1,12 @@
 package main
 
 import (
+	"bytes"
+	"encoding/binary"
 	"os"
 	"testing"
+
+	"github.com/kr/pretty"
 )
 
 func testWasmFile(t *testing.T, fname string) *Process {
@@ -77,3 +81,33 @@ func TestFileOps(t *testing.T) {
 		t.Fatalf("wanted \"Hello, world\", got: %q", string(data))
 	}
 }
+
+func TestArbint(t *testing.T) {
+	p := testWasmFile(t, "./testdata/arbint.wasm")
+	pretty.Println(p.vm.Memory()[0x200:0x204])
+}
+
+type structFromC struct {
+	Bar int32
+	Baz int32
+}
+
+func TestStruct(t *testing.T) {
+	p := testWasmFile(t, "./testdata/struct.wasm")
+	pretty.Println(p.vm.Memory()[0x200:0x208])
+
+	foo := structFromC{}
+	if err := binary.Read(bytes.NewReader(p.vm.Memory()[0x200:0x208]), binary.LittleEndian, &foo); err != nil {
+		t.Fatalf("can't read memory as the struct: %v", err)
+	}
+
+	t.Logf("%#v", foo)
+
+	if foo.Bar != 31337 {
+		t.Fatalf("wanted foo.bar to be 31337, got: %d", foo.Bar)
+	}
+
+	if foo.Baz != 255 {
+		t.Fatalf("wanted foo.baz to be 255, got: %d", foo.Baz)
+	}
+}
diff --git a/cmd/land/testdata/Tupfile b/cmd/land/testdata/Tupfile
new file mode 100644
index 0000000..cb970cd
--- /dev/null
+++ b/cmd/land/testdata/Tupfile
@@ -0,0 +1,7 @@
+include_rules
+
+CFLAGS += --target=wasm32-unknown-unknown-wasm
+CFLAGS += --sysroot=~/code/wasmception/sysroot/
+CFLAGS += -O0 -nostartfiles -Wl,--no-entry -nostdlib
+
+: foreach *.c |>  ~/code/wasmception/dist/bin/clang $(CFLAGS) %f -o %o |> %B.wasm
diff --git a/cmd/land/testdata/arbint.c b/cmd/land/testdata/arbint.c
new file mode 100644
index 0000000..ac1cf21
--- /dev/null
+++ b/cmd/land/testdata/arbint.c
@@ -0,0 +1,7 @@
+void _start() {}
+
+__attribute__ ((visibility ("default")))
+int main() {
+  *(int*)0x200 = 255;
+  return 0;
+}
diff --git a/cmd/land/testdata/arbint.wasm b/cmd/land/testdata/arbint.wasm
new file mode 100755
index 0000000000000000000000000000000000000000..696d679cf1150e5af2f3dba5d064215c39bb5b47
GIT binary patch
literal 200
zcmX|*v2MaZ5JYEo&j#U0Ns2U7ccP_slj^=?xxh(8_zc2Gh{`Vc>%>ZtX<qZBH%LPv
z04`+*?7&e~Kv(fXvQk3o4;>k&r)x(1W7#aWt}eNpuMa_EcFgHwUunq7mDwTPlI8xO
z;!67N!PTeCTFZLeO!E*B-vT{6PeCGr#>oX2e;6t+UR!zb&R4C#>uZDH`cyL4f_Jm~
ReA)J?>ui5JUkCmbegR;6C{F+Y

literal 0
HcmV?d00001

diff --git a/cmd/land/testdata/struct.c b/cmd/land/testdata/struct.c
new file mode 100644
index 0000000..ce2c5d9
--- /dev/null
+++ b/cmd/land/testdata/struct.c
@@ -0,0 +1,16 @@
+struct Foo {
+  int bar;
+  int baz;
+};
+
+__attribute__ ((visibility ("default")))
+int main() {
+  struct Foo foo;
+
+  foo.bar = 31337;
+  foo.baz = 255;
+
+  *(struct Foo*)0x200 = foo;
+
+  return 0;
+}
diff --git a/cmd/land/testdata/struct.wasm b/cmd/land/testdata/struct.wasm
new file mode 100755
index 0000000000000000000000000000000000000000..543b3d10e944872e5d36bda5594ab98ea0d6bc4f
GIT binary patch
literal 235
zcmX|+yG{c!6hvpPy$@xPfP#j~78MfpQu{M#xG{+(5b-9;MnW`rOMaD}9xMu`In61~
zAkLWp*vlGNgT)vDZNme}#t_n8nZmGq+M(bd{m|XnHmAHlz6%D`=M)e66z62PQr*T=
z)HH34*c@LbaP=rvdoW$$2g}V;2aj;!>EQV4CBPde-i9CgCVYL<w@#cH<*cF|1r^OG
q*4bNu@2cLr-gWn~SZB@$css?McrCb8eXFl@6L&k^oc70=e-Xdm^ew3X

literal 0
HcmV?d00001