flatten lib/std/special and improve "pkg inside another" logic

stage2: change logic for detecting whether the main package is inside
the std package. Previously it relied on realpath() which is not portable.
This uses resolve() which is how imports already work.

 * stage2: fix cleanup bug when creating Module
 * flatten lib/std/special/* to lib/*
   - this was motivated by making main_pkg_is_inside_std false for
     compiler_rt & friends.
 * rename "mini libc" to "universal libc"

1 files changed, 105 insertions, 0 deletions

diff --git a/lib/compiler_rt/cmpdi2_test.zig b/lib/compiler_rt/cmpdi2_test.zig
new file mode 100644
index 0000000000..a6d136b875
--- /dev/null
+++ b/lib/compiler_rt/cmpdi2_test.zig
@@ -0,0 +1,105 @@
+const cmp = @import("cmp.zig");
+const testing = @import("std").testing;
+
+fn test__cmpdi2(a: i64, b: i64, expected: i64) !void {
+    var result = cmp.__cmpdi2(a, b);
+    try testing.expectEqual(expected, result);
+}
+
+test "cmpdi2" {
+    // minInt == -9223372036854775808
+    // maxInt == 9223372036854775807
+    // minInt/2 == -4611686018427387904
+    // maxInt/2 == 4611686018427387903
+    // 1. equality minInt, minInt+1, minInt/2, 0, maxInt/2, maxInt-1, maxInt
+    try test__cmpdi2(-9223372036854775808, -9223372036854775808, 1);
+    try test__cmpdi2(-9223372036854775807, -9223372036854775807, 1);
+    try test__cmpdi2(-4611686018427387904, -4611686018427387904, 1);
+    try test__cmpdi2(-1, -1, 1);
+    try test__cmpdi2(0, 0, 1);
+    try test__cmpdi2(1, 1, 1);
+    try test__cmpdi2(4611686018427387903, 4611686018427387903, 1);
+    try test__cmpdi2(9223372036854775806, 9223372036854775806, 1);
+    try test__cmpdi2(9223372036854775807, 9223372036854775807, 1);
+    // 2. cmp minInt,   {        minInt + 1, minInt/2, -1, 0, 1, maxInt/2, maxInt-1, maxInt}
+    try test__cmpdi2(-9223372036854775808, -9223372036854775807, 0);
+    try test__cmpdi2(-9223372036854775808, -4611686018427387904, 0);
+    try test__cmpdi2(-9223372036854775808, -1, 0);
+    try test__cmpdi2(-9223372036854775808, 0, 0);
+    try test__cmpdi2(-9223372036854775808, 1, 0);
+    try test__cmpdi2(-9223372036854775808, 4611686018427387903, 0);
+    try test__cmpdi2(-9223372036854775808, 9223372036854775806, 0);
+    try test__cmpdi2(-9223372036854775808, 9223372036854775807, 0);
+    // 3. cmp minInt+1, {minInt,             minInt/2, -1,0,1, maxInt/2, maxInt-1, maxInt}
+    try test__cmpdi2(-9223372036854775807, -9223372036854775808, 2);
+    try test__cmpdi2(-9223372036854775807, -4611686018427387904, 0);
+    try test__cmpdi2(-9223372036854775807, -1, 0);
+    try test__cmpdi2(-9223372036854775807, 0, 0);
+    try test__cmpdi2(-9223372036854775807, 1, 0);
+    try test__cmpdi2(-9223372036854775807, 4611686018427387903, 0);
+    try test__cmpdi2(-9223372036854775807, 9223372036854775806, 0);
+    try test__cmpdi2(-9223372036854775807, 9223372036854775807, 0);
+    // 4. cmp minInt/2, {minInt, minInt + 1,           -1,0,1, maxInt/2, maxInt-1, maxInt}
+    try test__cmpdi2(-4611686018427387904, -9223372036854775808, 2);
+    try test__cmpdi2(-4611686018427387904, -9223372036854775807, 2);
+    try test__cmpdi2(-4611686018427387904, -1, 0);
+    try test__cmpdi2(-4611686018427387904, 0, 0);
+    try test__cmpdi2(-4611686018427387904, 1, 0);
+    try test__cmpdi2(-4611686018427387904, 4611686018427387903, 0);
+    try test__cmpdi2(-4611686018427387904, 9223372036854775806, 0);
+    try test__cmpdi2(-4611686018427387904, 9223372036854775807, 0);
+    // 5. cmp -1,       {minInt, minInt + 1, minInt/2,    0,1, maxInt/2, maxInt-1, maxInt}
+    try test__cmpdi2(-1, -9223372036854775808, 2);
+    try test__cmpdi2(-1, -9223372036854775807, 2);
+    try test__cmpdi2(-1, -4611686018427387904, 2);
+    try test__cmpdi2(-1, 0, 0);
+    try test__cmpdi2(-1, 1, 0);
+    try test__cmpdi2(-1, 4611686018427387903, 0);
+    try test__cmpdi2(-1, 9223372036854775806, 0);
+    try test__cmpdi2(-1, 9223372036854775807, 0);
+    // 6. cmp 0,        {minInt, minInt + 1, minInt/2, -1,  1, maxInt/2, maxInt-1, maxInt}
+    try test__cmpdi2(0, -9223372036854775808, 2);
+    try test__cmpdi2(0, -9223372036854775807, 2);
+    try test__cmpdi2(0, -4611686018427387904, 2);
+    try test__cmpdi2(0, -1, 2);
+    try test__cmpdi2(0, 1, 0);
+    try test__cmpdi2(0, 4611686018427387903, 0);
+    try test__cmpdi2(0, 9223372036854775806, 0);
+    try test__cmpdi2(0, 9223372036854775807, 0);
+    // 7. cmp 1,        {minInt, minInt + 1, minInt/2, -1,0,  maxInt/2, maxInt-1, maxInt}
+    try test__cmpdi2(1, -9223372036854775808, 2);
+    try test__cmpdi2(1, -9223372036854775807, 2);
+    try test__cmpdi2(1, -4611686018427387904, 2);
+    try test__cmpdi2(1, -1, 2);
+    try test__cmpdi2(1, 0, 2);
+    try test__cmpdi2(1, 4611686018427387903, 0);
+    try test__cmpdi2(1, 9223372036854775806, 0);
+    try test__cmpdi2(1, 9223372036854775807, 0);
+    // 8. cmp maxInt/2, {minInt, minInt + 1, minInt/2, -1,0,1,           maxInt-1, maxInt}
+    try test__cmpdi2(4611686018427387903, -9223372036854775808, 2);
+    try test__cmpdi2(4611686018427387903, -9223372036854775807, 2);
+    try test__cmpdi2(4611686018427387903, -4611686018427387904, 2);
+    try test__cmpdi2(4611686018427387903, -1, 2);
+    try test__cmpdi2(4611686018427387903, 0, 2);
+    try test__cmpdi2(4611686018427387903, 1, 2);
+    try test__cmpdi2(4611686018427387903, 9223372036854775806, 0);
+    try test__cmpdi2(4611686018427387903, 9223372036854775807, 0);
+    // 9. cmp maxInt-1, {minInt, minInt + 1, minInt/2, -1,0,1, maxInt/2,           maxInt}
+    try test__cmpdi2(9223372036854775806, -9223372036854775808, 2);
+    try test__cmpdi2(9223372036854775806, -9223372036854775807, 2);
+    try test__cmpdi2(9223372036854775806, -4611686018427387904, 2);
+    try test__cmpdi2(9223372036854775806, -1, 2);
+    try test__cmpdi2(9223372036854775806, 0, 2);
+    try test__cmpdi2(9223372036854775806, 1, 2);
+    try test__cmpdi2(9223372036854775806, 4611686018427387903, 2);
+    try test__cmpdi2(9223372036854775806, 9223372036854775807, 0);
+    // 10.cmp maxInt,   {minInt, minInt + 1, minInt/2, -1,0,1, maxInt/2, maxInt-1,       }
+    try test__cmpdi2(9223372036854775807, -9223372036854775808, 2);
+    try test__cmpdi2(9223372036854775807, -9223372036854775807, 2);
+    try test__cmpdi2(9223372036854775807, -4611686018427387904, 2);
+    try test__cmpdi2(9223372036854775807, -1, 2);
+    try test__cmpdi2(9223372036854775807, 0, 2);
+    try test__cmpdi2(9223372036854775807, 1, 2);
+    try test__cmpdi2(9223372036854775807, 4611686018427387903, 2);
+    try test__cmpdi2(9223372036854775807, 9223372036854775806, 2);
+}