From 7bd79cb741dca1491e510945762dc9d5422de534 Mon Sep 17 00:00:00 2001
From: David Gonzalez Martin <davidgmbb@gmail.com>
Date: Fri, 21 Feb 2025 11:34:20 -0600
Subject: [PATCH] Constant mul

---
 src/LLVM.zig           |  4 ++++
 src/converter.zig      | 12 +++++++++++-
 src/llvm_api.zig       |  1 +
 tests/constant_mul.bbb |  4 ++++
 4 files changed, 20 insertions(+), 1 deletion(-)
 create mode 100644 tests/constant_mul.bbb

diff --git a/src/LLVM.zig b/src/LLVM.zig
index 6d0e585..9b4f72e 100644
--- a/src/LLVM.zig
+++ b/src/LLVM.zig
@@ -548,6 +548,10 @@ pub const Builder = opaque {
         return api.LLVMBuildSub(builder, left, right, "");
     }
 
+    pub fn create_mul(builder: *Builder, left: *Value, right: *Value) *Value {
+        return api.LLVMBuildMul(builder, left, right, "");
+    }
+
     pub fn create_ret_void(builder: *Builder) void {
         builder.create_ret(null);
     }
diff --git a/src/converter.zig b/src/converter.zig
index 90460d8..8d0d32c 100644
--- a/src/converter.zig
+++ b/src/converter.zig
@@ -268,8 +268,9 @@ const Converter = struct {
 
     const ExpressionState = enum {
         none,
-        sub,
         add,
+        sub,
+        mul,
     };
 
     fn parse_value(noalias converter: *Converter, noalias thread: *llvm.Thread, expected_type: *llvm.Type) *llvm.Value {
@@ -293,6 +294,7 @@ const Converter = struct {
                 .none => current_value,
                 .sub => thread.builder.create_sub(left, right),
                 .add => thread.builder.create_add(left, right),
+                .mul => thread.builder.create_mul(left, right),
             };
 
             const ch = converter.content[converter.offset];
@@ -306,6 +308,10 @@ const Converter = struct {
                     converter.offset += 1;
                     break :blk .add;
                 },
+                '*' => blk: {
+                    converter.offset += 1;
+                    break :blk .mul;
+                },
                 else => os.abort(),
             };
 
@@ -693,3 +699,7 @@ test "constant add" {
 test "constant sub" {
     try invoke("constant_sub");
 }
+
+test "constant mul" {
+    try invoke("constant_mul");
+}
diff --git a/src/llvm_api.zig b/src/llvm_api.zig
index f277d13..0f4ccad 100644
--- a/src/llvm_api.zig
+++ b/src/llvm_api.zig
@@ -21,6 +21,7 @@ pub extern fn LLVMPositionBuilderAtEnd(builder: *llvm.Builder, basic_block: *llv
 pub extern fn LLVMBuildRet(builder: *llvm.Builder, value: ?*llvm.Value) void;
 pub extern fn LLVMBuildAdd(builder: *llvm.Builder, left: *llvm.Value, right: *llvm.Value, name: [*:0]const u8) *llvm.Value;
 pub extern fn LLVMBuildSub(builder: *llvm.Builder, left: *llvm.Value, right: *llvm.Value, name: [*:0]const u8) *llvm.Value;
+pub extern fn LLVMBuildMul(builder: *llvm.Builder, left: *llvm.Value, right: *llvm.Value, name: [*:0]const u8) *llvm.Value;
 
 pub extern fn LLVMTypeOf(value: *llvm.Value) *llvm.Type;
 pub extern fn LLVMGlobalGetValueType(value: *llvm.GlobalValue) *llvm.Type;
diff --git a/tests/constant_mul.bbb b/tests/constant_mul.bbb
new file mode 100644
index 0000000..db66565
--- /dev/null
+++ b/tests/constant_mul.bbb
@@ -0,0 +1,4 @@
+[export] main = fn [cc(c)] () s32
+{
+    return 1 * 0;
+}