Merge pull request #13420 from jacobly0/c-backend

cbe: enough fixes to bootstrap a compiler with a working c backend
This commit is contained in:
Veikka Tuominen 2022-11-03 13:43:10 +02:00 committed by GitHub
commit b2f8c1f2ef
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GPG Key ID: 4AEE18F83AFDEB23
3 changed files with 92 additions and 79 deletions

103
lib/include/zig.h vendored
View File

@ -66,9 +66,9 @@
#endif
#if defined(__cplusplus)
#define zig_extern_c extern "C"
#define zig_extern extern "C"
#else
#define zig_extern_c
#define zig_extern extern
#endif
#if zig_has_builtin(debugtrap)
@ -265,8 +265,8 @@ typedef int64_t zig_i64;
#define zig_compiler_rt_abbrev_f80 xf
#define zig_compiler_rt_abbrev_f128 tf
zig_extern_c void *memcpy (void *zig_restrict, void const *zig_restrict, zig_usize);
zig_extern_c void *memset (void *, int, zig_usize);
zig_extern void *memcpy (void *zig_restrict, void const *zig_restrict, zig_usize);
zig_extern void *memset (void *, int, zig_usize);
/* ==================== 8/16/32/64-bit Integer Routines ===================== */
@ -279,24 +279,21 @@ zig_extern_c void *memset (void *, int, zig_usize);
static inline zig_##Type zig_##operation##_##Type(zig_##Type lhs, zig_##RhsType rhs) { \
return lhs operator rhs; \
}
#define zig_int_operators(w) \
zig_int_operator(u##w, u##w, and, &) \
zig_int_operator(i##w, i##w, and, &) \
zig_int_operator(u##w, u##w, or, |) \
zig_int_operator(i##w, i##w, or, |) \
zig_int_operator(u##w, u##w, xor, ^) \
zig_int_operator(i##w, i##w, xor, ^) \
zig_int_operator(u##w, u8, shl, <<) \
zig_int_operator(i##w, u8, shl, <<) \
zig_int_operator(u##w, u8, shr, >>) \
zig_int_operator(u##w, u##w, div_floor, /) \
zig_int_operator(u##w, u##w, mod, %)
zig_int_operators(8)
zig_int_operators(16)
zig_int_operators(32)
zig_int_operators(64)
#define zig_int_basic_operator(Type, operation, operator) \
zig_int_operator(Type, Type, operation, operator)
#define zig_int_shift_operator(Type, operation, operator) \
zig_int_operator(Type, u8, operation, operator)
#define zig_int_helpers(w) \
zig_int_basic_operator(u##w, and, &) \
zig_int_basic_operator(i##w, and, &) \
zig_int_basic_operator(u##w, or, |) \
zig_int_basic_operator(i##w, or, |) \
zig_int_basic_operator(u##w, xor, ^) \
zig_int_basic_operator(i##w, xor, ^) \
zig_int_shift_operator(u##w, shl, <<) \
zig_int_shift_operator(i##w, shl, <<) \
zig_int_shift_operator(u##w, shr, >>) \
\
static inline zig_i##w zig_shr_i##w(zig_i##w lhs, zig_u8 rhs) { \
zig_i##w sign_mask = lhs < zig_as_i##w(0) ? -zig_as_i##w(1) : zig_as_i##w(0); \
return ((lhs ^ sign_mask) >> rhs) ^ sign_mask; \
@ -319,10 +316,14 @@ zig_int_operators(64)
return (val & zig_as_u##w(1) << (bits - zig_as_u8(1))) != 0 \
? val | zig_minInt(i##w, bits) : val & zig_maxInt(i##w, bits); \
} \
\
zig_int_basic_operator(u##w, div_floor, /) \
\
static inline zig_i##w zig_div_floor_i##w(zig_i##w lhs, zig_i##w rhs) { \
return lhs / rhs - (((lhs ^ rhs) & (lhs % rhs)) < zig_as_i##w(0)); \
} \
\
zig_int_basic_operator(u##w, mod, %) \
\
static inline zig_i##w zig_mod_i##w(zig_i##w lhs, zig_i##w rhs) { \
zig_i##w rem = lhs % rhs; \
@ -345,7 +346,7 @@ static inline zig_bool zig_addo_u32(zig_u32 *res, zig_u32 lhs, zig_u32 rhs, zig_
#endif
}
zig_extern_c zig_i32 __addosi4(zig_i32 lhs, zig_i32 rhs, zig_c_int *overflow);
zig_extern zig_i32 __addosi4(zig_i32 lhs, zig_i32 rhs, zig_c_int *overflow);
static inline zig_bool zig_addo_i32(zig_i32 *res, zig_i32 lhs, zig_i32 rhs, zig_u8 bits) {
#if zig_has_builtin(add_overflow)
zig_i32 full_res;
@ -371,7 +372,7 @@ static inline zig_bool zig_addo_u64(zig_u64 *res, zig_u64 lhs, zig_u64 rhs, zig_
#endif
}
zig_extern_c zig_i64 __addodi4(zig_i64 lhs, zig_i64 rhs, zig_c_int *overflow);
zig_extern zig_i64 __addodi4(zig_i64 lhs, zig_i64 rhs, zig_c_int *overflow);
static inline zig_bool zig_addo_i64(zig_i64 *res, zig_i64 lhs, zig_i64 rhs, zig_u8 bits) {
#if zig_has_builtin(add_overflow)
zig_i64 full_res;
@ -441,7 +442,7 @@ static inline zig_bool zig_subo_u32(zig_u32 *res, zig_u32 lhs, zig_u32 rhs, zig_
#endif
}
zig_extern_c zig_i32 __subosi4(zig_i32 lhs, zig_i32 rhs, zig_c_int *overflow);
zig_extern zig_i32 __subosi4(zig_i32 lhs, zig_i32 rhs, zig_c_int *overflow);
static inline zig_bool zig_subo_i32(zig_i32 *res, zig_i32 lhs, zig_i32 rhs, zig_u8 bits) {
#if zig_has_builtin(sub_overflow)
zig_i32 full_res;
@ -467,7 +468,7 @@ static inline zig_bool zig_subo_u64(zig_u64 *res, zig_u64 lhs, zig_u64 rhs, zig_
#endif
}
zig_extern_c zig_i64 __subodi4(zig_i64 lhs, zig_i64 rhs, zig_c_int *overflow);
zig_extern zig_i64 __subodi4(zig_i64 lhs, zig_i64 rhs, zig_c_int *overflow);
static inline zig_bool zig_subo_i64(zig_i64 *res, zig_i64 lhs, zig_i64 rhs, zig_u8 bits) {
#if zig_has_builtin(sub_overflow)
zig_i64 full_res;
@ -537,7 +538,7 @@ static inline zig_bool zig_mulo_u32(zig_u32 *res, zig_u32 lhs, zig_u32 rhs, zig_
#endif
}
zig_extern_c zig_i32 __mulosi4(zig_i32 lhs, zig_i32 rhs, zig_c_int *overflow);
zig_extern zig_i32 __mulosi4(zig_i32 lhs, zig_i32 rhs, zig_c_int *overflow);
static inline zig_bool zig_mulo_i32(zig_i32 *res, zig_i32 lhs, zig_i32 rhs, zig_u8 bits) {
#if zig_has_builtin(mul_overflow)
zig_i32 full_res;
@ -563,7 +564,7 @@ static inline zig_bool zig_mulo_u64(zig_u64 *res, zig_u64 lhs, zig_u64 rhs, zig_
#endif
}
zig_extern_c zig_i64 __mulodi4(zig_i64 lhs, zig_i64 rhs, zig_c_int *overflow);
zig_extern zig_i64 __mulodi4(zig_i64 lhs, zig_i64 rhs, zig_c_int *overflow);
static inline zig_bool zig_mulo_i64(zig_i64 *res, zig_i64 lhs, zig_i64 rhs, zig_u8 bits) {
#if zig_has_builtin(mul_overflow)
zig_i64 full_res;
@ -1210,7 +1211,7 @@ static inline zig_bool zig_addo_u128(zig_u128 *res, zig_u128 lhs, zig_u128 rhs,
#endif
}
zig_extern_c zig_i128 __addoti4(zig_i128 lhs, zig_i128 rhs, zig_c_int *overflow);
zig_extern zig_i128 __addoti4(zig_i128 lhs, zig_i128 rhs, zig_c_int *overflow);
static inline zig_bool zig_addo_i128(zig_i128 *res, zig_i128 lhs, zig_i128 rhs, zig_u8 bits) {
#if zig_has_builtin(add_overflow)
zig_i128 full_res;
@ -1236,7 +1237,7 @@ static inline zig_bool zig_subo_u128(zig_u128 *res, zig_u128 lhs, zig_u128 rhs,
#endif
}
zig_extern_c zig_i128 __suboti4(zig_i128 lhs, zig_i128 rhs, zig_c_int *overflow);
zig_extern zig_i128 __suboti4(zig_i128 lhs, zig_i128 rhs, zig_c_int *overflow);
static inline zig_bool zig_subo_i128(zig_i128 *res, zig_i128 lhs, zig_i128 rhs, zig_u8 bits) {
#if zig_has_builtin(sub_overflow)
zig_i128 full_res;
@ -1262,7 +1263,7 @@ static inline zig_bool zig_mulo_u128(zig_u128 *res, zig_u128 lhs, zig_u128 rhs,
#endif
}
zig_extern_c zig_i128 __muloti4(zig_i128 lhs, zig_i128 rhs, zig_c_int *overflow);
zig_extern zig_i128 __muloti4(zig_i128 lhs, zig_i128 rhs, zig_c_int *overflow);
static inline zig_bool zig_mulo_i128(zig_i128 *res, zig_i128 lhs, zig_i128 rhs, zig_u8 bits) {
#if zig_has_builtin(mul_overflow)
zig_i128 full_res;
@ -1552,7 +1553,7 @@ typedef long double zig_c_longdouble;
#define zig_as_special_c_longdouble(sign, name, arg, repr) sign __builtin_##name##l(arg)
#define zig_convert_builtin(ResType, operation, ArgType, version) \
zig_extern_c zig_##ResType zig_expand_concat(zig_expand_concat(zig_expand_concat(__##operation, \
zig_extern zig_##ResType zig_expand_concat(zig_expand_concat(zig_expand_concat(__##operation, \
zig_compiler_rt_abbrev_##ArgType), zig_compiler_rt_abbrev_##ResType), version)(zig_##ArgType);
zig_convert_builtin(f16, trunc, f32, 2)
zig_convert_builtin(f16, trunc, f64, 2)
@ -1585,7 +1586,7 @@ zig_convert_builtin(f128, extend, f80, 2)
}
#define zig_float_less_builtin_0(Type, operation) \
zig_extern_c zig_i8 zig_expand_concat(zig_expand_concat(__##operation, \
zig_extern zig_i8 zig_expand_concat(zig_expand_concat(__##operation, \
zig_compiler_rt_abbrev_##Type), 2)(zig_##Type, zig_##Type); \
static inline zig_i8 zig_##operation##_##Type(zig_##Type lhs, zig_##Type rhs) { \
return (zig_i8)zig_expand_concat(zig_expand_concat(__##operation, zig_compiler_rt_abbrev_##Type), 2)(lhs, rhs); \
@ -1603,7 +1604,7 @@ zig_convert_builtin(f128, extend, f80, 2)
}
#define zig_float_binary_builtin_0(Type, operation, operator) \
zig_extern_c zig_##Type zig_expand_concat(zig_expand_concat(__##operation, \
zig_extern zig_##Type zig_expand_concat(zig_expand_concat(__##operation, \
zig_compiler_rt_abbrev_##Type), 3)(zig_##Type, zig_##Type); \
static inline zig_##Type zig_##operation##_##Type(zig_##Type lhs, zig_##Type rhs) { \
return zig_expand_concat(zig_expand_concat(__##operation, zig_compiler_rt_abbrev_##Type), 3)(lhs, rhs); \
@ -1638,24 +1639,24 @@ zig_convert_builtin(f128, extend, f80, 2)
zig_expand_concat(zig_float_binary_builtin_, zig_has_##Type)(Type, sub, -) \
zig_expand_concat(zig_float_binary_builtin_, zig_has_##Type)(Type, mul, *) \
zig_expand_concat(zig_float_binary_builtin_, zig_has_##Type)(Type, div, /) \
zig_extern_c zig_##Type zig_libc_name_##Type(sqrt)(zig_##Type); \
zig_extern_c zig_##Type zig_libc_name_##Type(sin)(zig_##Type); \
zig_extern_c zig_##Type zig_libc_name_##Type(cos)(zig_##Type); \
zig_extern_c zig_##Type zig_libc_name_##Type(tan)(zig_##Type); \
zig_extern_c zig_##Type zig_libc_name_##Type(exp)(zig_##Type); \
zig_extern_c zig_##Type zig_libc_name_##Type(exp2)(zig_##Type); \
zig_extern_c zig_##Type zig_libc_name_##Type(log)(zig_##Type); \
zig_extern_c zig_##Type zig_libc_name_##Type(log2)(zig_##Type); \
zig_extern_c zig_##Type zig_libc_name_##Type(log10)(zig_##Type); \
zig_extern_c zig_##Type zig_libc_name_##Type(fabs)(zig_##Type); \
zig_extern_c zig_##Type zig_libc_name_##Type(floor)(zig_##Type); \
zig_extern_c zig_##Type zig_libc_name_##Type(ceil)(zig_##Type); \
zig_extern_c zig_##Type zig_libc_name_##Type(round)(zig_##Type); \
zig_extern_c zig_##Type zig_libc_name_##Type(trunc)(zig_##Type); \
zig_extern_c zig_##Type zig_libc_name_##Type(fmod)(zig_##Type, zig_##Type); \
zig_extern_c zig_##Type zig_libc_name_##Type(fmin)(zig_##Type, zig_##Type); \
zig_extern_c zig_##Type zig_libc_name_##Type(fmax)(zig_##Type, zig_##Type); \
zig_extern_c zig_##Type zig_libc_name_##Type(fma)(zig_##Type, zig_##Type, zig_##Type); \
zig_extern zig_##Type zig_libc_name_##Type(sqrt)(zig_##Type); \
zig_extern zig_##Type zig_libc_name_##Type(sin)(zig_##Type); \
zig_extern zig_##Type zig_libc_name_##Type(cos)(zig_##Type); \
zig_extern zig_##Type zig_libc_name_##Type(tan)(zig_##Type); \
zig_extern zig_##Type zig_libc_name_##Type(exp)(zig_##Type); \
zig_extern zig_##Type zig_libc_name_##Type(exp2)(zig_##Type); \
zig_extern zig_##Type zig_libc_name_##Type(log)(zig_##Type); \
zig_extern zig_##Type zig_libc_name_##Type(log2)(zig_##Type); \
zig_extern zig_##Type zig_libc_name_##Type(log10)(zig_##Type); \
zig_extern zig_##Type zig_libc_name_##Type(fabs)(zig_##Type); \
zig_extern zig_##Type zig_libc_name_##Type(floor)(zig_##Type); \
zig_extern zig_##Type zig_libc_name_##Type(ceil)(zig_##Type); \
zig_extern zig_##Type zig_libc_name_##Type(round)(zig_##Type); \
zig_extern zig_##Type zig_libc_name_##Type(trunc)(zig_##Type); \
zig_extern zig_##Type zig_libc_name_##Type(fmod)(zig_##Type, zig_##Type); \
zig_extern zig_##Type zig_libc_name_##Type(fmin)(zig_##Type, zig_##Type); \
zig_extern zig_##Type zig_libc_name_##Type(fmax)(zig_##Type, zig_##Type); \
zig_extern zig_##Type zig_libc_name_##Type(fma)(zig_##Type, zig_##Type, zig_##Type); \
\
static inline zig_##Type zig_div_trunc_##Type(zig_##Type lhs, zig_##Type rhs) { \
return zig_libc_name_##Type(trunc)(zig_div_##Type(lhs, rhs)); \

View File

@ -704,9 +704,13 @@ pub const DeclGen = struct {
try writer.writeByte('{');
if (ty.unionTagTypeSafety()) |tag_ty| {
try writer.writeAll(" .tag = ");
try dg.renderValue(writer, tag_ty, val, .Initializer);
try writer.writeAll(", .payload = {");
const layout = ty.unionGetLayout(target);
if (layout.tag_size != 0) {
try writer.writeAll(" .tag = ");
try dg.renderValue(writer, tag_ty, val, .Initializer);
try writer.writeByte(',');
}
try writer.writeAll(" .payload = {");
}
for (ty.unionFields().values()) |field| {
if (!field.ty.hasRuntimeBits()) continue;
@ -1115,7 +1119,6 @@ pub const DeclGen = struct {
},
.Union => {
const union_obj = val.castTag(.@"union").?.data;
const layout = ty.unionGetLayout(target);
if (location != .Initializer) {
try writer.writeByte('(');
@ -1125,6 +1128,7 @@ pub const DeclGen = struct {
try writer.writeByte('{');
if (ty.unionTagTypeSafety()) |tag_ty| {
const layout = ty.unionGetLayout(target);
if (layout.tag_size != 0) {
try writer.writeAll(".tag = ");
try dg.renderValue(writer, tag_ty, union_obj.tag, .Initializer);
@ -2215,7 +2219,7 @@ pub fn genFunc(f: *Function) !void {
const is_global = o.dg.module.decl_exports.contains(f.func.owner_decl);
const fwd_decl_writer = o.dg.fwd_decl.writer();
try fwd_decl_writer.writeAll(if (is_global) "zig_extern_c " else "static ");
try fwd_decl_writer.writeAll(if (is_global) "zig_extern " else "static ");
try o.dg.renderFunctionSignature(fwd_decl_writer, .Forward);
try fwd_decl_writer.writeAll(";\n");
@ -2252,9 +2256,10 @@ pub fn genDecl(o: *Object) !void {
.ty = o.dg.decl.ty,
.val = o.dg.decl.val,
};
if (!tv.ty.isFnOrHasRuntimeBitsIgnoreComptime()) return;
if (tv.val.tag() == .extern_fn) {
const fwd_decl_writer = o.dg.fwd_decl.writer();
try fwd_decl_writer.writeAll("zig_extern_c ");
try fwd_decl_writer.writeAll("zig_extern ");
try o.dg.renderFunctionSignature(fwd_decl_writer, .Forward);
try fwd_decl_writer.writeAll(";\n");
} else if (tv.val.castTag(.variable)) |var_payload| {
@ -2268,22 +2273,19 @@ pub fn genDecl(o: *Object) !void {
.decl = o.dg.decl_index,
};
if (is_global) try fwd_decl_writer.writeAll("zig_extern_c ");
try fwd_decl_writer.writeAll(if (is_global) "zig_extern " else "static ");
if (variable.is_threadlocal) try fwd_decl_writer.writeAll("zig_threadlocal ");
try o.dg.renderTypeAndName(fwd_decl_writer, o.dg.decl.ty, decl_c_value, .Mut, o.dg.decl.@"align", .Complete);
try fwd_decl_writer.writeAll(";\n");
if (variable.is_extern or variable.init.isUndefDeep()) {
return;
}
if (variable.is_extern) return;
const w = o.writer();
if (!is_global) try w.writeAll("static ");
if (variable.is_threadlocal) try w.writeAll("zig_threadlocal ");
try o.dg.renderTypeAndName(w, o.dg.decl.ty, decl_c_value, .Mut, o.dg.decl.@"align", .Complete);
try w.writeAll(" = ");
if (variable.init.tag() != .unreachable_value) {
try o.dg.renderValue(w, tv.ty, variable.init, .Initializer);
}
try o.dg.renderValue(w, tv.ty, variable.init, .Initializer);
try w.writeByte(';');
try o.indent_writer.insertNewline();
} else {
@ -2319,7 +2321,7 @@ pub fn genHeader(dg: *DeclGen) error{ AnalysisFail, OutOfMemory }!void {
.Fn => {
const is_global = dg.declIsGlobal(tv);
if (is_global) {
try writer.writeAll("zig_extern_c ");
try writer.writeAll("zig_extern ");
try dg.renderFunctionSignature(writer, .Complete);
try dg.fwd_decl.appendSlice(";\n");
}
@ -2432,7 +2434,7 @@ fn genBody(f: *Function, body: []const Air.Inst.Index) error{ AnalysisFail, OutO
.bool_or, .bit_or => try airBinOp(f, inst, "|", "or", .None),
.xor => try airBinOp(f, inst, "^", "xor", .None),
.shr, .shr_exact => try airBinBuiltinCall(f, inst, "shr", .None),
.shl, => try airBinBuiltinCall(f, inst, "shl", .None),
.shl, => try airBinBuiltinCall(f, inst, "shlw", .Bits),
.shl_exact => try airBinOp(f, inst, "<<", "shl", .None),
.not => try airNot (f, inst),
@ -3701,7 +3703,6 @@ fn airBitcast(f: *Function, inst: Air.Inst.Index) !CValue {
const local = try f.allocLocal(inst_ty, .Const);
try writer.writeAll(" = (");
try f.renderTypecast(writer, inst_ty);
try writer.writeByte(')');
try f.writeCValue(writer, operand, .Other);
try writer.writeAll(";\n");
@ -3719,6 +3720,17 @@ fn airBitcast(f: *Function, inst: Air.Inst.Index) !CValue {
try f.renderTypecast(writer, inst_ty);
try writer.writeAll("));\n");
// Ensure padding bits have the expected value.
if (inst_ty.isAbiInt()) {
try f.writeCValue(writer, local, .Other);
try writer.writeAll(" = zig_wrap_");
try f.object.dg.renderTypeForBuiltinFnName(writer, inst_ty);
try writer.writeByte('(');
try f.writeCValue(writer, local, .Other);
try f.object.dg.renderBuiltinInfo(writer, inst_ty, .Bits);
try writer.writeAll(");\n");
}
return local;
}
@ -5307,7 +5319,6 @@ fn airUnionInit(f: *Function, inst: Air.Inst.Index) !CValue {
const extra = f.air.extraData(Air.UnionInit, ty_pl.payload).data;
const union_ty = f.air.typeOfIndex(inst);
const target = f.object.dg.module.getTarget();
const layout = union_ty.unionGetLayout(target);
const union_obj = union_ty.cast(Type.Payload.Union).?.data;
const field_name = union_obj.fields.keys()[extra.field_index];
const payload = try f.resolveInst(extra.init);
@ -5316,6 +5327,7 @@ fn airUnionInit(f: *Function, inst: Air.Inst.Index) !CValue {
const local = try f.allocLocal(union_ty, .Const);
try writer.writeAll(" = {");
if (union_ty.unionTagTypeSafety()) |tag_ty| {
const layout = union_ty.unionGetLayout(target);
if (layout.tag_size != 0) {
const field_index = tag_ty.enumFieldIndex(field_name).?;

View File

@ -951,7 +951,7 @@ pub fn addCases(ctx: *TestContext) !void {
ctx.h("simple header", linux_x64,
\\export fn start() void{}
,
\\zig_extern_c zig_void start(zig_void);
\\zig_extern zig_void start(zig_void);
\\
);
ctx.h("header with single param function", linux_x64,
@ -959,7 +959,7 @@ pub fn addCases(ctx: *TestContext) !void {
\\ _ = a;
\\}
,
\\zig_extern_c zig_void start(zig_u8 const a0);
\\zig_extern zig_void start(zig_u8 const a0);
\\
);
ctx.h("header with multiple param function", linux_x64,
@ -967,25 +967,25 @@ pub fn addCases(ctx: *TestContext) !void {
\\ _ = a; _ = b; _ = c;
\\}
,
\\zig_extern_c zig_void start(zig_u8 const a0, zig_u8 const a1, zig_u8 const a2);
\\zig_extern zig_void start(zig_u8 const a0, zig_u8 const a1, zig_u8 const a2);
\\
);
ctx.h("header with u32 param function", linux_x64,
\\export fn start(a: u32) void{ _ = a; }
,
\\zig_extern_c zig_void start(zig_u32 const a0);
\\zig_extern zig_void start(zig_u32 const a0);
\\
);
ctx.h("header with usize param function", linux_x64,
\\export fn start(a: usize) void{ _ = a; }
,
\\zig_extern_c zig_void start(zig_usize const a0);
\\zig_extern zig_void start(zig_usize const a0);
\\
);
ctx.h("header with bool param function", linux_x64,
\\export fn start(a: bool) void{_ = a;}
,
\\zig_extern_c zig_void start(zig_bool const a0);
\\zig_extern zig_void start(zig_bool const a0);
\\
);
ctx.h("header with noreturn function", linux_x64,
@ -993,7 +993,7 @@ pub fn addCases(ctx: *TestContext) !void {
\\ unreachable;
\\}
,
\\zig_extern_c zig_noreturn start(zig_void);
\\zig_extern zig_noreturn start(zig_void);
\\
);
ctx.h("header with multiple functions", linux_x64,
@ -1001,15 +1001,15 @@ pub fn addCases(ctx: *TestContext) !void {
\\export fn b() void{}
\\export fn c() void{}
,
\\zig_extern_c zig_void a(zig_void);
\\zig_extern_c zig_void b(zig_void);
\\zig_extern_c zig_void c(zig_void);
\\zig_extern zig_void a(zig_void);
\\zig_extern zig_void b(zig_void);
\\zig_extern zig_void c(zig_void);
\\
);
ctx.h("header with multiple includes", linux_x64,
\\export fn start(a: u32, b: usize) void{ _ = a; _ = b; }
,
\\zig_extern_c zig_void start(zig_u32 const a0, zig_usize const a1);
\\zig_extern zig_void start(zig_u32 const a0, zig_usize const a1);
\\
);
}