[ELF] - Support "INSERT AFTER" statement.

This implements INSERT AFTER in a following way:

During reading scripts it collects all insert statements.
After we done and read all files it inserts statements into script commands list.

With that:
* Rest of code does know nothing about INSERT.
* Approach is straightforward and have no visible limitations.
* It is also easy to support INSERT BEFORE (was seen in clang code once).
* Should work for PR35877 and similar cases.

Cons:
* It assumes we have "main" scripts that describes sections.

Differential revision: https://reviews.llvm.org/D43468

llvm-svn: 327003

1 files changed, 4 insertions, 0 deletions

diff --git a/lld/test/ELF/linkerscript/Inputs/insert-after.script b/lld/test/ELF/linkerscript/Inputs/insert-after.script
new file mode 100644
index 00000000000..cb95878bc5c
--- /dev/null
+++ b/lld/test/ELF/linkerscript/Inputs/insert-after.script
@@ -0,0 +1,4 @@
+SECTIONS {
+  .text  : { *(.text.*) }
+  .data  : { *(.data.*) }
+}