Example #1
0
File: lower.go Project: mewmew/uc
// globalVarDecl lowers the given global variable declaration to LLVM IR,
// emitting code to m.
func (m *Module) globalVarDecl(n *ast.VarDecl) {
	// Input:
	//    int x;
	// Output:
	//    @x = global i32 0
	ident := n.Name()
	dbg.Printf("create global variable: %v", n)
	typ := toIrType(n.Type())
	var val value.Value
	switch {
	case n.Val != nil:
		panic("support for global variable initializer not yet implemented")
	case irtypes.IsInt(typ):
		var err error
		val, err = constant.NewInt(typ, "0")
		if err != nil {
			panic(fmt.Sprintf("unable to create integer constant; %v", err))
		}
	default:
		val = constant.NewZeroInitializer(typ)
	}
	global, err := ir.NewGlobalDef(ident.Name, val, false)
	if err != nil {
		panic(fmt.Sprintf("unable to create global variable definition %q", ident))
	}
	m.setIdentValue(ident, global)
	// Emit global variable definition.
	m.emitGlobal(global)
}
Example #2
0
File: lower.go Project: mewmew/uc
// localVarDef lowers the given local variable definition to LLVM IR, emitting
// code to f.
func (m *Module) localVarDef(f *Function, n *ast.VarDecl) {
	// Input:
	//    void f() {
	//       int a;           // <-- relevant line
	//    }
	// Output:
	//    %a = alloca i32
	ident := n.Name()
	dbg.Printf("create local variable: %v", n)
	typ := toIrType(n.Type())
	allocaInst, err := instruction.NewAlloca(typ, 1)
	if err != nil {
		panic(fmt.Sprintf("unable to create alloca instruction; %v", err))
	}
	// Emit local variable definition.
	f.emitLocal(ident, allocaInst)
	if n.Val != nil {
		panic("support for local variable definition initializer not yet implemented")
	}
}