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stage2: set up a trampoline table for functions

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However there does not appear to be an x86 encoding for calling an
immediate address. So there's no point of setting this up. We should
just emit an indirect call to the got addr.
This commit is contained in:
Andrew Kelley
2020-05-19 13:33:36 -04:00
parent 1cde0edff4
commit 8d812dba30
3 changed files with 183 additions and 34 deletions
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17
src-self-hosted/Module.zig
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@@ -231,6 +231,7 @@ pub const Fn = struct {
dependency_failure,
success: Body,
},
owner_decl: *Decl,
/// This memory is temporary and points to stack memory for the duration
/// of Fn analysis.
@@ -883,14 +884,6 @@ fn resolveDecl(
};
const arena_state = try decl_scope.arena.allocator.create(std.heap.ArenaAllocator.State);
const has_codegen_bits = typed_value.ty.hasCodeGenBits();
if (has_codegen_bits) {
// We don't fully codegen the decl until later, but we do need to reserve a global
// offset table index for it. This allows us to codegen decls out of dependency order,
// increasing how many computations can be done in parallel.
try self.bin_file.allocateDeclIndexes(new_decl);
}
arena_state.* = decl_scope.arena.state;
new_decl.typed_value = .{
@@ -900,7 +893,12 @@ fn resolveDecl(
},
};
new_decl.analysis = .complete;
if (has_codegen_bits) {
if (typed_value.ty.hasCodeGenBits()) {
// We don't fully codegen the decl until later, but we do need to reserve a global
// offset table index for it. This allows us to codegen decls out of dependency order,
// increasing how many computations can be done in parallel.
try self.bin_file.allocateDeclIndexes(new_decl);
// We ensureCapacity when scanning for decls.
self.work_queue.writeItemAssumeCapacity(.{ .codegen_decl = new_decl });
}
@@ -1329,6 +1327,7 @@ fn analyzeInstFn(self: *Module, scope: *Scope, fn_inst: *zir.Inst.Fn) InnerError
new_func.* = .{
.fn_type = fn_type,
.analysis = .{ .queued = fn_inst },
.owner_decl = scope.decl(),
};
const fn_payload = try scope.arena().create(Value.Payload.Function);
fn_payload.* = .{ .func = new_func };