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stage2 cbe: loop instruction

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Veikka Tuominen 2021-01-26 19:50:46 +02:00
parent bf76501b5d
commit 81c512f35b
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GPG Key ID: 59AEB8936E16A6AC
1 changed files with 58 additions and 41 deletions
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97
src/codegen/c.zig
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@ -6,7 +6,8 @@ const Writer = std.ArrayList(u8).Writer;
const link = @import("../link.zig");
const Module = @import("../Module.zig");
const Compilation = @import("../Compilation.zig");
const Inst = @import("../ir.zig").Inst;
const ir = @import("../ir.zig");
const Inst = ir.Inst;
const Value = @import("../value.zig").Value;
const Type = @import("../type.zig").Type;
const TypedValue = @import("../TypedValue.zig");
@ -324,51 +325,13 @@ pub fn genDecl(o: *Object) !void {
try fwd_decl_writer.writeAll(";\n");
const func: *Module.Fn = func_payload.data;
const instructions = func.body.instructions;
const writer = o.code.writer();
try writer.writeAll("\n");
try o.dg.renderFunctionSignature(writer, is_global);
if (instructions.len == 0) {
try writer.writeAll(" {}\n");
return;
}
try writer.writeAll(" {");
try genBody(o, func.body);
try writer.writeAll("\n");
for (instructions) |inst| {
const result_value = switch (inst.tag) {
.add => try genBinOp(o, inst.castTag(.add).?, " + "),
.alloc => try genAlloc(o, inst.castTag(.alloc).?),
.arg => genArg(o),
.assembly => try genAsm(o, inst.castTag(.assembly).?),
.block => try genBlock(o, inst.castTag(.block).?),
.bitcast => try genBitcast(o, inst.castTag(.bitcast).?),
.breakpoint => try genBreakpoint(o, inst.castTag(.breakpoint).?),
.call => try genCall(o, inst.castTag(.call).?),
.cmp_eq => try genBinOp(o, inst.castTag(.cmp_eq).?, " == "),
.cmp_gt => try genBinOp(o, inst.castTag(.cmp_gt).?, " > "),
.cmp_gte => try genBinOp(o, inst.castTag(.cmp_gte).?, " >= "),
.cmp_lt => try genBinOp(o, inst.castTag(.cmp_lt).?, " < "),
.cmp_lte => try genBinOp(o, inst.castTag(.cmp_lte).?, " <= "),
.cmp_neq => try genBinOp(o, inst.castTag(.cmp_neq).?, " != "),
.dbg_stmt => try genDbgStmt(o, inst.castTag(.dbg_stmt).?),
.intcast => try genIntCast(o, inst.castTag(.intcast).?),
.load => try genLoad(o, inst.castTag(.load).?),
.ret => try genRet(o, inst.castTag(.ret).?),
.retvoid => try genRetVoid(o),
.store => try genStore(o, inst.castTag(.store).?),
.sub => try genBinOp(o, inst.castTag(.sub).?, " - "),
.unreach => try genUnreach(o, inst.castTag(.unreach).?),
else => |e| return o.dg.fail(o.dg.decl.src(), "TODO: C backend: implement codegen for {}", .{e}),
};
switch (result_value) {
.none => {},
else => try o.value_map.putNoClobber(inst, result_value),
}
}
try writer.writeAll("}\n");
} else if (tv.val.tag() == .extern_fn) {
const writer = o.code.writer();
try writer.writeAll("ZIG_EXTERN_C ");
@ -410,6 +373,52 @@ pub fn genHeader(dg: *DeclGen) error{ AnalysisFail, OutOfMemory }!void {
}
}
pub fn genBody(o: *Object, body: ir.Body) error{ AnalysisFail, OutOfMemory }!void {
const writer = o.code.writer();
if (body.instructions.len == 0) {
try writer.writeAll(" {}");
return;
}
try writer.writeAll(" {");
try writer.writeAll("\n");
for (body.instructions) |inst| {
const result_value = switch (inst.tag) {
.add => try genBinOp(o, inst.castTag(.add).?, " + "),
.alloc => try genAlloc(o, inst.castTag(.alloc).?),
.arg => genArg(o),
.assembly => try genAsm(o, inst.castTag(.assembly).?),
.block => try genBlock(o, inst.castTag(.block).?),
.bitcast => try genBitcast(o, inst.castTag(.bitcast).?),
.breakpoint => try genBreakpoint(o, inst.castTag(.breakpoint).?),
.call => try genCall(o, inst.castTag(.call).?),
.cmp_eq => try genBinOp(o, inst.castTag(.cmp_eq).?, " == "),
.cmp_gt => try genBinOp(o, inst.castTag(.cmp_gt).?, " > "),
.cmp_gte => try genBinOp(o, inst.castTag(.cmp_gte).?, " >= "),
.cmp_lt => try genBinOp(o, inst.castTag(.cmp_lt).?, " < "),
.cmp_lte => try genBinOp(o, inst.castTag(.cmp_lte).?, " <= "),
.cmp_neq => try genBinOp(o, inst.castTag(.cmp_neq).?, " != "),
.dbg_stmt => try genDbgStmt(o, inst.castTag(.dbg_stmt).?),
.intcast => try genIntCast(o, inst.castTag(.intcast).?),
.load => try genLoad(o, inst.castTag(.load).?),
.ret => try genRet(o, inst.castTag(.ret).?),
.retvoid => try genRetVoid(o),
.store => try genStore(o, inst.castTag(.store).?),
.sub => try genBinOp(o, inst.castTag(.sub).?, " - "),
.unreach => try genUnreach(o, inst.castTag(.unreach).?),
.loop => try genLoop(o, inst.castTag(.loop).?),
else => |e| return o.dg.fail(o.dg.decl.src(), "TODO: C backend: implement codegen for {}", .{e}),
};
switch (result_value) {
.none => {},
else => try o.value_map.putNoClobber(inst, result_value),
}
}
try writer.writeAll("}");
}
fn genAlloc(o: *Object, alloc: *Inst.NoOp) !CValue {
const writer = o.code.writer();
@ -627,6 +636,14 @@ fn genUnreach(o: *Object, inst: *Inst.NoOp) !CValue {
return CValue.none;
}
fn genLoop(o: *Object, inst: *Inst.Loop) !CValue {
try o.indent();
try o.code.writer().writeAll("while (true)");
try genBody(o, inst.body);
try o.code.writer().writeAll("\n");
return CValue.none;
}
fn genAsm(o: *Object, as: *Inst.Assembly) !CValue {
if (as.base.isUnused() and !as.is_volatile)
return CValue.none;