From 14cf82aa37ec33012ca48febd83fb16e1178beee Mon Sep 17 00:00:00 2001 From: qmuntal Date: Tue, 17 Jan 2023 08:15:33 +0100 Subject: cmd/link: generate .pdata PE section This CL adds a .pdata section to the PE file generated by the Go linker. The .pdata section is a standard section [1] that contains an array of function table entries that are used for stack unwinding. The table entries layout is taken from [2]. This CL just generates the table entries without any unwinding information, which is enough to start doing some E2E tests between the Go linker and the Win32 APIs. The goal of the .pdata table is to allow Windows retrieve unwind information for a function at a given PC. It does so by doing a binary search on the table, looking for an entry that meets BeginAddress >= PC < EndAddress. Each table entry takes 12 bytes and only non-leaf functions with frame pointer needs an entry on the .pdata table. The result is that PE binaries will be ~0.7% bigger due to the unwind information, a reasonable amount considering the benefits in debuggability. Updates #57302 [1] https://learn.microsoft.com/en-us/windows/win32/debug/pe-format#the-pdata-section [2] https://learn.microsoft.com/en-us/cpp/build/exception-handling-x64#struct-runtime_function Change-Id: If675d10c64452946dbab76709da20569651e3e9f Reviewed-on: https://go-review.googlesource.com/c/go/+/461738 TryBot-Result: Gopher Robot Reviewed-by: Alex Brainman Reviewed-by: Than McIntosh Run-TryBot: Quim Muntal Reviewed-by: Cherry Mui --- src/runtime/export_windows_test.go | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) (limited to 'src/runtime/export_windows_test.go') diff --git a/src/runtime/export_windows_test.go b/src/runtime/export_windows_test.go index 332136b586..5b9f08fb79 100644 --- a/src/runtime/export_windows_test.go +++ b/src/runtime/export_windows_test.go @@ -20,3 +20,19 @@ func NumberOfProcessors() int32 { stdcall1(_GetSystemInfo, uintptr(unsafe.Pointer(&info))) return int32(info.dwnumberofprocessors) } + +type ContextStub struct { + context +} + +func (c ContextStub) GetPC() uintptr { + return c.ip() +} + +func NewContextStub() ContextStub { + var ctx context + ctx.set_ip(getcallerpc()) + ctx.set_sp(getcallersp()) + ctx.set_fp(getcallerfp()) + return ContextStub{ctx} +} -- cgit v1.3-5-g9baa