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CBE: properly resolve Insts

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This commit is contained in:
Noam Preil
2020-09-08 14:41:51 -04:00
parent 9ef6c0a035
commit e06ba9e86e
1 changed files with 15 additions and 3 deletions
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18
src/codegen/c.zig
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@@ -109,6 +109,18 @@ const Context = struct {
argdex: usize = 0,
unnamed_index: usize = 0,
fn resolveInst(self: *Context, inst: *Inst) ![]u8 {
if (inst.cast(Inst.Constant)) |const_inst| {
var out = std.ArrayList(u8).init(&self.arena.allocator);
try renderValue(self, out.writer(), inst.ty, const_inst.val);
return out.toOwnedSlice();
}
if (self.inst_map.get(inst)) |val| {
return val;
}
return self.file.fail(inst.src, "Internal error: failed to resolve inst!", .{});
}
fn name(self: *Context) ![]u8 {
const val = try std.fmt.allocPrint(&self.arena.allocator, "__temp_{}", .{self.unnamed_index});
self.unnamed_index += 1;
@@ -186,8 +198,7 @@ fn genIntCast(ctx: *Context, inst: *Inst.UnOp) !?[]u8 {
const op = inst.operand;
const writer = ctx.file.main.writer();
const name = try ctx.name();
const from = ctx.inst_map.get(op) orelse
return ctx.file.fail(ctx.decl.src(), "Internal error in C backend: intCast argument not found in inst_map", .{});
const from = try ctx.resolveInst(inst.operand);
try writer.writeAll(indentation ++ "const ");
try renderType(ctx, writer, inst.base.ty);
try writer.print(" {} = (", .{name});
@@ -223,7 +234,8 @@ fn genCall(ctx: *Context, inst: *Inst.Call) !?[]u8 {
if (arg.cast(Inst.Constant)) |con| {
try renderValue(ctx, writer, arg.ty, con.val);
} else {
return ctx.file.fail(ctx.decl.src(), "TODO call pass arg {}", .{arg});
const val = try ctx.resolveInst(arg);
try writer.print("{}", .{val});
}
}
}