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x86_64: add support for pie executables

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This commit is contained in:
Jacob Young
2025-06-04 21:45:31 -04:00
committed by Andrew Kelley
parent 178ee8aef1
commit 0bf8617d96
45 changed files with 884 additions and 640 deletions
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34
src/codegen/c.zig
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@@ -2255,19 +2255,30 @@ pub const DeclGen = struct {
fn renderFwdDecl(
dg: *DeclGen,
nav_index: InternPool.Nav.Index,
flags: struct {
is_extern: bool,
flags: packed struct {
is_const: bool,
is_threadlocal: bool,
is_weak_linkage: bool,
linkage: std.builtin.GlobalLinkage,
visibility: std.builtin.SymbolVisibility,
},
) !void {
const zcu = dg.pt.zcu;
const ip = &zcu.intern_pool;
const nav = ip.getNav(nav_index);
const fwd = dg.fwdDeclWriter();
try fwd.writeAll(if (flags.is_extern) "zig_extern " else "static ");
if (flags.is_weak_linkage) try fwd.writeAll("zig_weak_linkage ");
try fwd.writeAll(switch (flags.linkage) {
.internal => "static ",
.strong, .weak, .link_once => "zig_extern ",
});
switch (flags.linkage) {
.internal, .strong => {},
.weak => try fwd.writeAll("zig_weak_linkage "),
.link_once => return dg.fail("TODO: CBE: implement linkonce linkage?", .{}),
}
switch (flags.linkage) {
.internal => {},
.strong, .weak, .link_once => try fwd.print("zig_visibility({s}) ", .{@tagName(flags.visibility)}),
}
if (flags.is_threadlocal and !dg.mod.single_threaded) try fwd.writeAll("zig_threadlocal ");
try dg.renderTypeAndName(
fwd,
@@ -2994,10 +3005,10 @@ pub fn genDecl(o: *Object) !void {
switch (ip.indexToKey(nav.status.fully_resolved.val)) {
.@"extern" => |@"extern"| {
if (!ip.isFunctionType(nav_ty.toIntern())) return o.dg.renderFwdDecl(o.dg.pass.nav, .{
.is_extern = true,
.is_const = @"extern".is_const,
.is_threadlocal = @"extern".is_threadlocal,
.is_weak_linkage = @"extern".is_weak_linkage,
.linkage = @"extern".linkage,
.visibility = @"extern".visibility,
});
const fwd = o.dg.fwdDeclWriter();
@@ -3016,13 +3027,12 @@ pub fn genDecl(o: *Object) !void {
},
.variable => |variable| {
try o.dg.renderFwdDecl(o.dg.pass.nav, .{
.is_extern = false,
.is_const = false,
.is_threadlocal = variable.is_threadlocal,
.is_weak_linkage = variable.is_weak_linkage,
.linkage = .internal,
.visibility = .default,
});
const w = o.writer();
if (variable.is_weak_linkage) try w.writeAll("zig_weak_linkage ");
if (variable.is_threadlocal and !o.dg.mod.single_threaded) try w.writeAll("zig_threadlocal ");
if (nav.status.fully_resolved.@"linksection".toSlice(&zcu.intern_pool)) |s|
try w.print("zig_linksection({s}) ", .{fmtStringLiteral(s, null)});
@@ -3467,7 +3477,7 @@ fn genBodyInner(f: *Function, body: []const Air.Inst.Index) error{ AnalysisFail,
.error_set_has_value => return f.fail("TODO: C backend: implement error_set_has_value", .{}),
.vector_store_elem => return f.fail("TODO: C backend: implement vector_store_elem", .{}),
.tlv_dllimport_ptr => try airTlvDllimportPtr(f, inst),
.runtime_nav_ptr => try airRuntimeNavPtr(f, inst),
.c_va_start => try airCVaStart(f, inst),
.c_va_arg => try airCVaArg(f, inst),
@@ -7672,7 +7682,7 @@ fn airMulAdd(f: *Function, inst: Air.Inst.Index) !CValue {
return local;
}
fn airTlvDllimportPtr(f: *Function, inst: Air.Inst.Index) !CValue {
fn airRuntimeNavPtr(f: *Function, inst: Air.Inst.Index) !CValue {
const ty_nav = f.air.instructions.items(.data)[@intFromEnum(inst)].ty_nav;
const writer = f.object.writer();
const local = try f.allocLocal(inst, .fromInterned(ty_nav.ty));