Overloaded name lookup fix (#2199)

* #include an absolute path didn't work - because paths were taken to always be relative.

* Fix for overloaded name lookup.

* Small improvements.

4 files changed, 58 insertions, 0 deletions

diff --git a/tests/bugs/operator-overload.slang b/tests/bugs/operator-overload.slang
new file mode 100644
index 000000000..b70b9b987
--- /dev/null
+++ b/tests/bugs/operator-overload.slang
@@ -0,0 +1,31 @@
+//TEST(compute):COMPARE_COMPUTE_EX:-slang -compute -shaderobj
+
+// Tests operator overloading works in user space.
+
+//TEST_INPUT:ubuffer(data=[0 0 0 0], stride=4):out,name outputBuffer
+RWStructuredBuffer<int> outputBuffer;
+
+struct Vec2d
+{   
+    float x, y;
+};
+
+Vec2d operator+(Vec2d a, Vec2d b)
+{
+    return {a.x + b.x, a.y + b.y};
+}
+
+[numthreads(4, 1, 1)]
+void computeMain(uint3 dispatchThreadID : SV_DispatchThreadID)
+{    
+    int index = dispatchThreadID.x;
+    
+    Vec2d a = { 1, -index + 3 };
+    Vec2d b = { index - 4, index * index };
+    
+    Vec2d c = a + b;
+    
+    int r = int(c.x + c.y);
+    
+    outputBuffer[dispatchThreadID.x] = int(r);
+}
\ No newline at end of file
diff --git a/tests/bugs/operator-overload.slang.expected.txt b/tests/bugs/operator-overload.slang.expected.txt
new file mode 100644
index 000000000..c9fa0697e
--- /dev/null
+++ b/tests/bugs/operator-overload.slang.expected.txt
@@ -0,0 +1,4 @@
+0
+1
+4
+9
diff --git a/tests/bugs/shadowed-lookup.slang b/tests/bugs/shadowed-lookup.slang
new file mode 100644
index 000000000..ed4ab7893
--- /dev/null
+++ b/tests/bugs/shadowed-lookup.slang
@@ -0,0 +1,23 @@
+//TEST:COMPARE_COMPUTE_EX: -slang -compute
+
+RWStructuredBuffer<float> outputBuffer;
+
+struct SomeType
+{
+    float2x2 v;
+};
+
+float mul(SomeType a, float2 v) { return mul(a.v, v).x; }
+
+[numthreads(4, 1, 1)]
+void computeMain(uint3 dispatchThreadID : SV_DispatchThreadID)
+{
+    uint tid = dispatchThreadID.x;
+
+    float inVal = float(tid);
+
+    float2 v = float2(inVal, inVal + 2);
+    SomeType t = { inVal + 1, 0, 1, 0 };
+    
+    outputBuffer[tid] = mul(t, v).x;
+} 
\ No newline at end of file
diff --git a/tests/bugs/shadowed-lookup.slang.expected.txt b/tests/bugs/shadowed-lookup.slang.expected.txt
new file mode 100644
index 000000000..e69de29bb
--- /dev/null
+++ b/tests/bugs/shadowed-lookup.slang.expected.txt