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elf: add basic handling of .data section

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This commit is contained in:
Jakub Konka 2022-02-03 00:28:56 +01:00
parent 557a097523
commit b77757fe39
3 changed files with 186 additions and 75 deletions
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251
src/link/Elf.zig
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@ -56,6 +56,11 @@ phdr_load_re_index: ?u16 = null,
phdr_got_index: ?u16 = null,
/// The index into the program headers of a PT_LOAD program header with Read flag
phdr_load_ro_index: ?u16 = null,
/// The index into the program headers of a PT_LOAD program header with Write flag
phdr_load_rw_index: ?u16 = null,
phdr_shdr_table: std.AutoHashMapUnmanaged(u16, u16) = .{},
entry_addr: ?u64 = null,
debug_strtab: std.ArrayListUnmanaged(u8) = std.ArrayListUnmanaged(u8){},
@ -63,7 +68,10 @@ shstrtab: std.ArrayListUnmanaged(u8) = std.ArrayListUnmanaged(u8){},
shstrtab_index: ?u16 = null,
symtab_section_index: ?u16 = null,
text_section_index: ?u16 = null,
rodata_section_index: ?u16 = null,
got_section_index: ?u16 = null,
data_section_index: ?u16 = null,
debug_info_section_index: ?u16 = null,
debug_abbrev_section_index: ?u16 = null,
debug_str_section_index: ?u16 = null,
@ -116,8 +124,9 @@ error_flags: File.ErrorFlags = File.ErrorFlags{},
/// overcapacity can be negative. A simple way to have negative overcapacity is to
/// allocate a fresh text block, which will have ideal capacity, and then grow it
/// by 1 byte. It will then have -1 overcapacity.
text_block_list: TextBlockList = .{},
rodata_block_list: TextBlockList = .{},
atoms: std.AutoHashMapUnmanaged(u16, *TextBlock) = .{},
atom_free_lists: std.AutoHashMapUnmanaged(u16, std.ArrayListUnmanaged(*TextBlock)) = .{},
decls: std.AutoHashMapUnmanaged(*Module.Decl, ?u16) = .{},
/// A list of `SrcFn` whose Line Number Programs have surplus capacity.
/// This is the same concept as `text_block_free_list`; see those doc comments.
@ -205,14 +214,6 @@ pub const TextBlock = struct {
}
};
/// A list of text blocks in a specific section
const TextBlockList = struct {
free_list: std.ArrayListUnmanaged(*TextBlock) = .{},
last_block: ?*TextBlock = null,
phdr_index: ?u16 = null,
section_index: ?u16 = null,
};
pub const Export = struct {
sym_index: ?u32 = null,
};
@ -326,11 +327,20 @@ pub fn deinit(self: *Elf) void {
self.global_symbol_free_list.deinit(self.base.allocator);
self.local_symbol_free_list.deinit(self.base.allocator);
self.offset_table_free_list.deinit(self.base.allocator);
self.text_block_list.free_list.deinit(self.base.allocator);
self.rodata_block_list.free_list.deinit(self.base.allocator);
self.dbg_line_fn_free_list.deinit(self.base.allocator);
self.dbg_info_decl_free_list.deinit(self.base.allocator);
self.offset_table.deinit(self.base.allocator);
self.phdr_shdr_table.deinit(self.base.allocator);
self.decls.deinit(self.base.allocator);
self.atoms.deinit(self.base.allocator);
{
var it = self.atom_free_lists.valueIterator();
while (it.next()) |free_list| {
free_list.deinit(self.base.allocator);
}
self.atom_free_lists.deinit(self.base.allocator);
}
}
pub fn getDeclVAddr(self: *Elf, decl: *const Module.Decl) u64 {
@ -463,11 +473,10 @@ pub fn populateMissingMetadata(self: *Elf) !void {
const ptr_size: u8 = self.ptrWidthBytes();
if (self.phdr_load_re_index == null) {
self.phdr_load_re_index = @intCast(u16, self.program_headers.items.len);
self.text_block_list.phdr_index = self.phdr_load_re_index;
const file_size = self.base.options.program_code_size_hint;
const p_align = 0x1000;
const off = self.findFreeSpace(file_size, p_align);
log.debug("found PT_LOAD free space 0x{x} to 0x{x}", .{ off, off + file_size });
log.debug("found PT_LOAD RE free space 0x{x} to 0x{x}", .{ off, off + file_size });
const entry_addr: u64 = self.entry_addr orelse if (self.base.options.target.cpu.arch == .spu_2) @as(u64, 0) else default_entry_addr;
try self.program_headers.append(self.base.allocator, .{
.p_type = elf.PT_LOAD,
@ -479,6 +488,7 @@ pub fn populateMissingMetadata(self: *Elf) !void {
.p_align = p_align,
.p_flags = elf.PF_X | elf.PF_R,
});
try self.atom_free_lists.putNoClobber(self.base.allocator, self.phdr_load_re_index.?, .{});
self.entry_addr = null;
self.phdr_table_dirty = true;
}
@ -489,7 +499,7 @@ pub fn populateMissingMetadata(self: *Elf) !void {
// page align.
const p_align = if (self.base.options.target.os.tag == .linux) 0x1000 else @as(u16, ptr_size);
const off = self.findFreeSpace(file_size, p_align);
log.debug("found PT_LOAD free space 0x{x} to 0x{x}", .{ off, off + file_size });
log.debug("found PT_LOAD GOT free space 0x{x} to 0x{x}", .{ off, off + file_size });
// TODO instead of hard coding the vaddr, make a function to find a vaddr to put things at.
// we'll need to re-use that function anyway, in case the GOT grows and overlaps something
// else in virtual memory.
@ -508,15 +518,14 @@ pub fn populateMissingMetadata(self: *Elf) !void {
}
if (self.phdr_load_ro_index == null) {
self.phdr_load_ro_index = @intCast(u16, self.program_headers.items.len);
self.rodata_block_list.phdr_index = self.phdr_load_ro_index;
// TODO Find a hint about how much data need to be in rodata ?
const file_size = 1024;
// Same reason as for GOT
const p_align = if (self.base.options.target.os.tag == .linux) 0x1000 else @as(u16, ptr_size);
const off = self.findFreeSpace(file_size, p_align);
log.debug("found PT_LOAD free space 0x{x} to 0x{x}\n", .{ off, off + file_size });
log.debug("found PT_LOAD RO free space 0x{x} to 0x{x}\n", .{ off, off + file_size });
// TODO Same as for GOT
const rodata_addr: u32 = if (self.base.options.target.cpu.arch.ptrBitWidth() >= 32) 0x6000000 else 0xD000;
const rodata_addr: u32 = if (self.base.options.target.cpu.arch.ptrBitWidth() >= 32) 0x5000000 else 0xa000;
try self.program_headers.append(self.base.allocator, .{
.p_type = elf.PT_LOAD,
.p_offset = off,
@ -527,6 +536,30 @@ pub fn populateMissingMetadata(self: *Elf) !void {
.p_align = p_align,
.p_flags = elf.PF_R,
});
try self.atom_free_lists.putNoClobber(self.base.allocator, self.phdr_load_ro_index.?, .{});
self.phdr_table_dirty = true;
}
if (self.phdr_load_rw_index == null) {
self.phdr_load_rw_index = @intCast(u16, self.program_headers.items.len);
// TODO Find a hint about how much data need to be in data ?
const file_size = 1024;
// Same reason as for GOT
const p_align = if (self.base.options.target.os.tag == .linux) 0x1000 else @as(u16, ptr_size);
const off = self.findFreeSpace(file_size, p_align);
log.debug("found PT_LOAD RW free space 0x{x} to 0x{x}\n", .{ off, off + file_size });
// TODO Same as for GOT
const rwdata_addr: u32 = if (self.base.options.target.cpu.arch.ptrBitWidth() >= 32) 0x6000000 else 0xc000;
try self.program_headers.append(self.base.allocator, .{
.p_type = elf.PT_LOAD,
.p_offset = off,
.p_filesz = file_size,
.p_vaddr = rwdata_addr,
.p_paddr = rwdata_addr,
.p_memsz = file_size,
.p_align = p_align,
.p_flags = elf.PF_R | elf.PF_W,
});
try self.atom_free_lists.putNoClobber(self.base.allocator, self.phdr_load_rw_index.?, .{});
self.phdr_table_dirty = true;
}
if (self.shstrtab_index == null) {
@ -550,8 +583,8 @@ pub fn populateMissingMetadata(self: *Elf) !void {
self.shstrtab_dirty = true;
self.shdr_table_dirty = true;
}
if (self.text_block_list.section_index == null) {
self.text_block_list.section_index = @intCast(u16, self.sections.items.len);
if (self.text_section_index == null) {
self.text_section_index = @intCast(u16, self.sections.items.len);
const phdr = &self.program_headers.items[self.phdr_load_re_index.?];
try self.sections.append(self.base.allocator, .{
@ -566,6 +599,11 @@ pub fn populateMissingMetadata(self: *Elf) !void {
.sh_addralign = phdr.p_align,
.sh_entsize = 0,
});
try self.phdr_shdr_table.putNoClobber(
self.base.allocator,
self.phdr_load_re_index.?,
self.text_section_index.?,
);
self.shdr_table_dirty = true;
}
if (self.got_section_index == null) {
@ -584,10 +622,15 @@ pub fn populateMissingMetadata(self: *Elf) !void {
.sh_addralign = phdr.p_align,
.sh_entsize = 0,
});
try self.phdr_shdr_table.putNoClobber(
self.base.allocator,
self.phdr_got_index.?,
self.got_section_index.?,
);
self.shdr_table_dirty = true;
}
if (self.rodata_block_list.section_index == null) {
self.rodata_block_list.section_index = @intCast(u16, self.sections.items.len);
if (self.rodata_section_index == null) {
self.rodata_section_index = @intCast(u16, self.sections.items.len);
const phdr = &self.program_headers.items[self.phdr_load_ro_index.?];
try self.sections.append(self.base.allocator, .{
@ -602,6 +645,34 @@ pub fn populateMissingMetadata(self: *Elf) !void {
.sh_addralign = phdr.p_align,
.sh_entsize = 0,
});
try self.phdr_shdr_table.putNoClobber(
self.base.allocator,
self.phdr_load_ro_index.?,
self.rodata_section_index.?,
);
self.shdr_table_dirty = true;
}
if (self.data_section_index == null) {
self.data_section_index = @intCast(u16, self.sections.items.len);
const phdr = &self.program_headers.items[self.phdr_load_rw_index.?];
try self.sections.append(self.base.allocator, .{
.sh_name = try self.makeString(".data"),
.sh_type = elf.SHT_PROGBITS,
.sh_flags = elf.SHF_WRITE | elf.SHF_ALLOC,
.sh_addr = phdr.p_vaddr,
.sh_offset = phdr.p_offset,
.sh_size = phdr.p_filesz,
.sh_link = 0,
.sh_info = 0,
.sh_addralign = phdr.p_align,
.sh_entsize = 0,
});
try self.phdr_shdr_table.putNoClobber(
self.base.allocator,
self.phdr_load_rw_index.?,
self.data_section_index.?,
);
self.shdr_table_dirty = true;
}
if (self.symtab_section_index == null) {
@ -2072,17 +2143,18 @@ fn writeElfHeader(self: *Elf) !void {
try self.base.file.?.pwriteAll(hdr_buf[0..index], 0);
}
fn freeTextBlock(self: *Elf, block_list: *TextBlockList, text_block: *TextBlock) void {
fn freeTextBlock(self: *Elf, text_block: *TextBlock, phdr_index: u16) void {
const free_list = self.atom_free_lists.getPtr(phdr_index).?;
var already_have_free_list_node = false;
{
var i: usize = 0;
// TODO turn text_block_free_list into a hash map
while (i < block_list.free_list.items.len) {
if (block_list.free_list.items[i] == text_block) {
_ = block_list.free_list.swapRemove(i);
// TODO turn free_list into a hash map
while (i < free_list.items.len) {
if (free_list.items[i] == text_block) {
_ = free_list.swapRemove(i);
continue;
}
if (block_list.free_list.items[i] == text_block.prev) {
if (free_list.items[i] == text_block.prev) {
already_have_free_list_node = true;
}
i += 1;
@ -2090,10 +2162,17 @@ fn freeTextBlock(self: *Elf, block_list: *TextBlockList, text_block: *TextBlock)
}
// TODO process free list for dbg info just like we do above for vaddrs
if (block_list.last_block == text_block) {
// TODO shrink the .text section size here
block_list.last_block = text_block.prev;
if (self.atoms.getPtr(phdr_index)) |last_block| {
if (last_block.* == text_block) {
if (text_block.prev) |prev| {
// TODO shrink the section size here
last_block.* = prev;
} else {
_ = self.atoms.fetchRemove(phdr_index);
}
}
}
if (self.dbg_info_decl_first == text_block) {
self.dbg_info_decl_first = text_block.dbg_info_next;
}
@ -2108,7 +2187,7 @@ fn freeTextBlock(self: *Elf, block_list: *TextBlockList, text_block: *TextBlock)
if (!already_have_free_list_node and prev.freeListEligible(self.*)) {
// The free list is heuristics, it doesn't have to be perfect, so we can
// ignore the OOM here.
block_list.free_list.append(self.base.allocator, prev) catch {};
free_list.append(self.base.allocator, prev) catch {};
}
} else {
text_block.prev = null;
@ -2135,24 +2214,25 @@ fn freeTextBlock(self: *Elf, block_list: *TextBlockList, text_block: *TextBlock)
}
}
fn shrinkTextBlock(self: *Elf, block_list: *TextBlockList, text_block: *TextBlock, new_block_size: u64) void {
fn shrinkTextBlock(self: *Elf, text_block: *TextBlock, new_block_size: u64, phdr_index: u16) void {
_ = self;
_ = block_list;
_ = text_block;
_ = new_block_size;
_ = phdr_index;
}
fn growTextBlock(self: *Elf, block_list: *TextBlockList, text_block: *TextBlock, new_block_size: u64, alignment: u64) !u64 {
fn growTextBlock(self: *Elf, text_block: *TextBlock, new_block_size: u64, alignment: u64, phdr_index: u16) !u64 {
const sym = self.local_symbols.items[text_block.local_sym_index];
const align_ok = mem.alignBackwardGeneric(u64, sym.st_value, alignment) == sym.st_value;
const need_realloc = !align_ok or new_block_size > text_block.capacity(self.*);
if (!need_realloc) return sym.st_value;
return self.allocateTextBlock(block_list, text_block, new_block_size, alignment);
return self.allocateTextBlock(text_block, new_block_size, alignment, phdr_index);
}
fn allocateTextBlock(self: *Elf, block_list: *TextBlockList, text_block: *TextBlock, new_block_size: u64, alignment: u64) !u64 {
const phdr = &self.program_headers.items[block_list.phdr_index.?];
const shdr = &self.sections.items[block_list.section_index.?];
fn allocateTextBlock(self: *Elf, text_block: *TextBlock, new_block_size: u64, alignment: u64, phdr_index: u16) !u64 {
const shdr_index = self.phdr_shdr_table.get(phdr_index).?;
const phdr = &self.program_headers.items[phdr_index];
const shdr = &self.sections.items[shdr_index];
const new_block_ideal_capacity = padToIdeal(new_block_size);
// We use these to indicate our intention to update metadata, placing the new block,
@ -2162,13 +2242,14 @@ fn allocateTextBlock(self: *Elf, block_list: *TextBlockList, text_block: *TextBl
// is actually carried out at the end of the function, when errors are no longer possible.
var block_placement: ?*TextBlock = null;
var free_list_removal: ?usize = null;
var free_list = self.atom_free_lists.get(phdr_index).?;
// First we look for an appropriately sized free list node.
// The list is unordered. We'll just take the first thing that works.
const vaddr = blk: {
var i: usize = 0;
while (i < block_list.free_list.items.len) {
const big_block = block_list.free_list.items[i];
while (i < free_list.items.len) {
const big_block = free_list.items[i];
// We now have a pointer to a live text block that has too much capacity.
// Is it enough that we could fit this new text block?
const sym = self.local_symbols.items[big_block.local_sym_index];
@ -2183,7 +2264,7 @@ fn allocateTextBlock(self: *Elf, block_list: *TextBlockList, text_block: *TextBl
// should be deleted because the block that it points to has grown to take up
// more of the extra capacity.
if (!big_block.freeListEligible(self.*)) {
_ = block_list.free_list.swapRemove(i);
_ = free_list.swapRemove(i);
} else {
i += 1;
}
@ -2201,7 +2282,7 @@ fn allocateTextBlock(self: *Elf, block_list: *TextBlockList, text_block: *TextBl
free_list_removal = i;
}
break :blk new_start_vaddr;
} else if (block_list.last_block) |last| {
} else if (self.atoms.get(phdr_index)) |last| {
const sym = self.local_symbols.items[last.local_sym_index];
const ideal_capacity = padToIdeal(sym.st_size);
const ideal_capacity_end_vaddr = sym.st_value + ideal_capacity;
@ -2221,7 +2302,7 @@ fn allocateTextBlock(self: *Elf, block_list: *TextBlockList, text_block: *TextBl
if (needed_size > text_capacity) {
// Must move the entire text section.
const new_offset = self.findFreeSpace(needed_size, 0x1000);
const text_size = if (block_list.last_block) |last| blk: {
const text_size = if (self.atoms.get(phdr_index)) |last| blk: {
const sym = self.local_symbols.items[last.local_sym_index];
break :blk (sym.st_value + sym.st_size) - phdr.p_vaddr;
} else 0;
@ -2230,7 +2311,7 @@ fn allocateTextBlock(self: *Elf, block_list: *TextBlockList, text_block: *TextBl
shdr.sh_offset = new_offset;
phdr.p_offset = new_offset;
}
block_list.last_block = text_block;
_ = try self.atoms.put(self.base.allocator, phdr_index, text_block);
shdr.sh_size = needed_size;
phdr.p_memsz = needed_size;
@ -2268,19 +2349,11 @@ fn allocateTextBlock(self: *Elf, block_list: *TextBlockList, text_block: *TextBl
text_block.next = null;
}
if (free_list_removal) |i| {
_ = block_list.free_list.swapRemove(i);
_ = free_list.swapRemove(i);
}
return vaddr;
}
/// Get the block list corresponding to a specific decl
/// For example, if the decl is a function, it returns the list of the section .text
fn getDeclBlockList(self: *Elf, decl: *const Module.Decl) *TextBlockList {
// const is_fn = decl.val.tag() == .function;
const is_fn = decl.ty.zigTypeTag() == .Fn;
return if (is_fn) &self.text_block_list else &self.rodata_block_list;
}
pub fn allocateDeclIndexes(self: *Elf, decl: *Module.Decl) !void {
if (self.llvm_object) |_| return;
@ -2288,6 +2361,7 @@ pub fn allocateDeclIndexes(self: *Elf, decl: *Module.Decl) !void {
try self.local_symbols.ensureUnusedCapacity(self.base.allocator, 1);
try self.offset_table.ensureUnusedCapacity(self.base.allocator, 1);
try self.decls.putNoClobber(self.base.allocator, decl, null);
if (self.local_symbol_free_list.popOrNull()) |i| {
log.debug("reusing symbol index {d} for {s}", .{ i, decl.name });
@ -2306,14 +2380,12 @@ pub fn allocateDeclIndexes(self: *Elf, decl: *Module.Decl) !void {
self.offset_table_count_dirty = true;
}
const phdr = &self.program_headers.items[self.phdr_load_re_index.?];
self.local_symbols.items[decl.link.elf.local_sym_index] = .{
.st_name = 0,
.st_info = 0,
.st_other = 0,
.st_shndx = 0,
.st_value = phdr.p_vaddr,
.st_value = 0,
.st_size = 0,
};
self.offset_table.items[decl.link.elf.offset_table_index] = 0;
@ -2324,10 +2396,12 @@ pub fn freeDecl(self: *Elf, decl: *Module.Decl) void {
if (self.llvm_object) |llvm_object| return llvm_object.freeDecl(decl);
}
const block_list = self.getDeclBlockList(decl);
const kv = self.decls.fetchRemove(decl);
if (kv.?.value) |index| {
self.freeTextBlock(&decl.link.elf, index);
}
// Appending to free lists is allowed to fail because the free lists are heuristics based anyway.
self.freeTextBlock(block_list, &decl.link.elf);
if (decl.link.elf.local_sym_index != 0) {
self.local_symbol_free_list.append(self.base.allocator, decl.link.elf.local_sym_index) catch {};
self.offset_table_free_list.append(self.base.allocator, decl.link.elf.offset_table_index) catch {};
@ -2366,11 +2440,39 @@ fn deinitRelocs(gpa: Allocator, table: *File.DbgInfoTypeRelocsTable) void {
table.deinit(gpa);
}
fn getDeclPhdrIndex(self: *Elf, decl: *Module.Decl) !u16 {
const ty = decl.ty;
const zig_ty = ty.zigTypeTag();
const val = decl.val;
const phdr_index: u16 = blk: {
if (val.isUndefDeep()) {
// TODO in release-fast and release-small, we should put undef in .bss
break :blk self.phdr_load_rw_index.?;
}
switch (zig_ty) {
.Fn => break :blk self.phdr_load_re_index.?,
else => {
if (val.castTag(.variable)) |_| {
break :blk self.phdr_load_rw_index.?;
}
break :blk self.phdr_load_ro_index.?;
},
}
};
return phdr_index;
}
fn updateDeclCode(self: *Elf, decl: *Module.Decl, code: []const u8, stt_bits: u8) !*elf.Elf64_Sym {
log.debug("updateDeclCode {s}{*}", .{ mem.sliceTo(decl.name, 0), decl });
const required_alignment = decl.ty.abiAlignment(self.base.options.target);
const block_list = self.getDeclBlockList(decl);
const decl_ptr = self.decls.getPtr(decl).?;
if (decl_ptr.* == null) {
decl_ptr.* = try self.getDeclPhdrIndex(decl);
}
const phdr_index = decl_ptr.*.?;
const shdr_index = self.phdr_shdr_table.get(phdr_index).?;
assert(decl.link.elf.local_sym_index != 0); // Caller forgot to allocateDeclIndexes()
const local_sym = &self.local_symbols.items[decl.link.elf.local_sym_index];
@ -2379,7 +2481,7 @@ fn updateDeclCode(self: *Elf, decl: *Module.Decl, code: []const u8, stt_bits: u8
const need_realloc = code.len > capacity or
!mem.isAlignedGeneric(u64, local_sym.st_value, required_alignment);
if (need_realloc) {
const vaddr = try self.growTextBlock(block_list, &decl.link.elf, code.len, required_alignment);
const vaddr = try self.growTextBlock(&decl.link.elf, code.len, required_alignment, phdr_index);
log.debug("growing {s} from 0x{x} to 0x{x}", .{ decl.name, local_sym.st_value, vaddr });
if (vaddr != local_sym.st_value) {
local_sym.st_value = vaddr;
@ -2389,28 +2491,28 @@ fn updateDeclCode(self: *Elf, decl: *Module.Decl, code: []const u8, stt_bits: u8
try self.writeOffsetTableEntry(decl.link.elf.offset_table_index);
}
} else if (code.len < local_sym.st_size) {
self.shrinkTextBlock(block_list, &decl.link.elf, code.len);
self.shrinkTextBlock(&decl.link.elf, code.len, phdr_index);
}
local_sym.st_size = code.len;
local_sym.st_name = try self.updateString(local_sym.st_name, mem.sliceTo(decl.name, 0));
local_sym.st_info = (elf.STB_LOCAL << 4) | stt_bits;
local_sym.st_other = 0;
local_sym.st_shndx = block_list.section_index.?;
local_sym.st_shndx = shdr_index;
// TODO this write could be avoided if no fields of the symbol were changed.
try self.writeSymbol(decl.link.elf.local_sym_index);
} else {
const decl_name = mem.sliceTo(decl.name, 0);
const name_str_index = try self.makeString(decl_name);
const vaddr = try self.allocateTextBlock(block_list, &decl.link.elf, code.len, required_alignment);
errdefer self.freeTextBlock(block_list, &decl.link.elf);
const vaddr = try self.allocateTextBlock(&decl.link.elf, code.len, required_alignment, phdr_index);
errdefer self.freeTextBlock(&decl.link.elf, phdr_index);
log.debug("allocated text block for {s} at 0x{x}", .{ decl_name, vaddr });
errdefer self.freeTextBlock(block_list, &decl.link.elf);
errdefer self.freeTextBlock(&decl.link.elf, phdr_index);
local_sym.* = .{
.st_name = name_str_index,
.st_info = (elf.STB_LOCAL << 4) | stt_bits,
.st_other = 0,
.st_shndx = block_list.section_index.?,
.st_shndx = shdr_index,
.st_value = vaddr,
.st_size = code.len,
};
@ -2420,8 +2522,8 @@ fn updateDeclCode(self: *Elf, decl: *Module.Decl, code: []const u8, stt_bits: u8
try self.writeOffsetTableEntry(decl.link.elf.offset_table_index);
}
const section_offset = local_sym.st_value - self.program_headers.items[block_list.phdr_index.?].p_vaddr;
const file_offset = self.sections.items[block_list.section_index.?].sh_offset + section_offset;
const section_offset = local_sym.st_value - self.program_headers.items[phdr_index].p_vaddr;
const file_offset = self.sections.items[shdr_index].sh_offset + section_offset;
try self.base.file.?.pwriteAll(code, file_offset);
return local_sym;
@ -3008,7 +3110,12 @@ pub fn updateDeclExports(
if (decl.link.elf.local_sym_index == 0) return;
const decl_sym = self.local_symbols.items[decl.link.elf.local_sym_index];
const block_list = self.getDeclBlockList(decl);
const decl_ptr = self.decls.getPtr(decl).?;
if (decl_ptr.* == null) {
decl_ptr.* = try self.getDeclPhdrIndex(decl);
}
const phdr_index = decl_ptr.*.?;
const shdr_index = self.phdr_shdr_table.get(phdr_index).?;
for (exports) |exp| {
if (exp.options.section) |section_name| {
@ -3047,7 +3154,7 @@ pub fn updateDeclExports(
.st_name = try self.updateString(sym.st_name, exp.options.name),
.st_info = (stb_bits << 4) | stt_bits,
.st_other = 0,
.st_shndx = block_list.section_index.?,
.st_shndx = shdr_index,
.st_value = decl_sym.st_value,
.st_size = decl_sym.st_size,
};
@ -3061,7 +3168,7 @@ pub fn updateDeclExports(
.st_name = name,
.st_info = (stb_bits << 4) | stt_bits,
.st_other = 0,
.st_shndx = block_list.section_index.?,
.st_shndx = shdr_index,
.st_value = decl_sym.st_value,
.st_size = decl_sym.st_size,
};

2
test/behavior.zig
View File

@ -14,6 +14,7 @@ test {
_ = @import("behavior/bugs/1277.zig");
_ = @import("behavior/bugs/1310.zig");
_ = @import("behavior/bugs/1381.zig");
_ = @import("behavior/bugs/1486.zig");
_ = @import("behavior/bugs/1500.zig");
_ = @import("behavior/bugs/1735.zig");
_ = @import("behavior/bugs/2006.zig");
@ -43,7 +44,6 @@ test {
_ = @import("behavior/bugs/624.zig");
_ = @import("behavior/bugs/704.zig");
_ = @import("behavior/bugs/1076.zig");
_ = @import("behavior/bugs/1486.zig");
_ = @import("behavior/bugs/2692.zig");
_ = @import("behavior/bugs/2889.zig");
_ = @import("behavior/bugs/3046.zig");

8
test/behavior/bugs/1486.zig
View File

@ -1,9 +1,13 @@
const expect = @import("std").testing.expect;
const std = @import("std");
const builtin = @import("builtin");
const expect = std.testing.expect;
const ptr = &global;
var global: u64 = 123;
var global: usize = 123;
test "constant pointer to global variable causes runtime load" {
if (builtin.zig_backend == .stage2_x86_64) return error.SkipZigTest;
global = 1234;
try expect(&global == ptr);
try expect(ptr.* == 1234);