Commit 47a4d43e41

Timon Kruiper <timonkruiper@gmail.com>
2020-12-29 20:18:17
stage2: Add code generation for Load instruction in LLVM backend
The following now works: ``` export fn _start() noreturn { var x: bool = true; var y: bool = x; exit(); } fn exit() noreturn { unreachable; } ```
master
1 parent 19cfd31
Changed files (2)
src
llvm_backend.zig
llvm_bindings.zig
src/llvm_backend.zig
@@ -312,6 +312,7 @@ pub const LLVMIRModule = struct {
                         .arg => try self.genArg(inst.castTag(.arg).?),
                         .alloc => try self.genAlloc(inst.castTag(.alloc).?),
                         .store => try self.genStore(inst.castTag(.store).?),
+                        .load => try self.genLoad(inst.castTag(.load).?),
                         .dbg_stmt => blk: {
                             // TODO: implement debug info
                             break :blk null;
@@ -396,6 +397,11 @@ pub const LLVMIRModule = struct {
         return null;
     }
 
+    fn genLoad(self: *LLVMIRModule, inst: *Inst.UnOp) !?*const llvm.ValueRef {
+        const ptr_val = try self.resolveInst(inst.operand);
+        return self.builder.buildLoad(ptr_val, "");
+    }
+
     fn genBreakpoint(self: *LLVMIRModule, inst: *Inst.NoOp) !?*const llvm.ValueRef {
         // TODO: Store this function somewhere such that we dont have to add it again
         const fn_type = llvm.TypeRef.functionType(llvm.voidType(), null, 0, false);
src/llvm_bindings.zig
@@ -125,6 +125,9 @@ pub const BuilderRef = opaque {
 
     pub const buildStore = LLVMBuildStore;
     extern fn LLVMBuildStore(*const BuilderRef, Val: *const ValueRef, Ptr: *const ValueRef) *const ValueRef;
+
+    pub const buildLoad = LLVMBuildLoad;
+    extern fn LLVMBuildLoad(*const BuilderRef, PointerVal: *const ValueRef, Name: [*:0]const u8) *const ValueRef;
 };
 
 pub const BasicBlockRef = opaque {