[analysis] Implement an Int lattice (#6037)

Implement a generic lattice template for integral types ordered by `<`.

1 files changed, 36 insertions, 0 deletions

diff --git a/test/gtest/lattices.cpp b/test/gtest/lattices.cpp
index f06ba612b..d72e088fc 100644
--- a/test/gtest/lattices.cpp
+++ b/test/gtest/lattices.cpp
@@ -15,6 +15,7 @@
  */
 
 #include "analysis/lattices/bool.h"
+#include "analysis/lattices/int.h"
 #include "gtest/gtest.h"
 
 using namespace wasm;
@@ -48,3 +49,38 @@ TEST(BoolLattice, Join) {
   EXPECT_FALSE(lattice.join(elem, true));
   ASSERT_TRUE(elem);
 }
+
+TEST(IntLattice, GetBottom) {
+  analysis::Int32 int32;
+  EXPECT_EQ(int32.getBottom(), (int32_t)(1ll << 31));
+
+  analysis::Int64 int64;
+  EXPECT_EQ(int64.getBottom(), (int64_t)(1ll << 63));
+
+  analysis::UInt32 uint32;
+  EXPECT_EQ(uint32.getBottom(), (uint32_t)0);
+
+  analysis::UInt64 uint64;
+  EXPECT_EQ(uint64.getBottom(), (uint32_t)0);
+}
+
+TEST(IntLattice, Compare) {
+  analysis::Int32 int32;
+  EXPECT_EQ(int32.compare(-5, 42), analysis::LESS);
+  EXPECT_EQ(int32.compare(42, -5), analysis::GREATER);
+  EXPECT_EQ(int32.compare(42, 42), analysis::EQUAL);
+}
+
+TEST(IntLattice, Join) {
+  analysis::Int32 int32;
+  int elem = 0;
+
+  EXPECT_FALSE(int32.join(elem, -10));
+  ASSERT_EQ(elem, 0);
+
+  EXPECT_FALSE(int32.join(elem, 0));
+  ASSERT_EQ(elem, 0);
+
+  EXPECT_TRUE(int32.join(elem, 100));
+  ASSERT_EQ(elem, 100);
+}