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Merge "Move DwarfCfaInfo::kTable from data.rel.ro to rodata"

This commit is contained in:
Treehugger Robot 2018-12-21 12:58:26 +00:00 committed by Gerrit Code Review
parent bcede5f61a 80aba5494a
commit a7d2ffa821
2 changed files with 47 additions and 40 deletions
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78
libunwindstack/DwarfCfa.cpp
View File

@ -204,7 +204,7 @@ template <typename AddressType>
bool DwarfCfa<AddressType>::LogInstruction(uint32_t indent, uint64_t cfa_offset, uint8_t op,
uint64_t* cur_pc) {
const auto* cfa = &DwarfCfaInfo::kTable[op];
if (cfa->name == nullptr) {
if (cfa->name[0] == '\0') {
log(indent, "Illegal");
log(indent, "Raw Data: 0x%02x", op);
return true;
@ -677,29 +677,29 @@ const DwarfCfaInfo::Info DwarfCfaInfo::kTable[64] = {
{DW_EH_PE_uleb128, DW_EH_PE_block},
{DWARF_DISPLAY_REGISTER, DWARF_DISPLAY_EVAL_BLOCK},
},
{nullptr, 0, 0, {}, {}}, // 0x17 illegal cfa
{nullptr, 0, 0, {}, {}}, // 0x18 illegal cfa
{nullptr, 0, 0, {}, {}}, // 0x19 illegal cfa
{nullptr, 0, 0, {}, {}}, // 0x1a illegal cfa
{nullptr, 0, 0, {}, {}}, // 0x1b illegal cfa
{nullptr, 0, 0, {}, {}}, // 0x1c DW_CFA_lo_user (Treat as illegal)
{nullptr, 0, 0, {}, {}}, // 0x1d illegal cfa
{nullptr, 0, 0, {}, {}}, // 0x1e illegal cfa
{nullptr, 0, 0, {}, {}}, // 0x1f illegal cfa
{nullptr, 0, 0, {}, {}}, // 0x20 illegal cfa
{nullptr, 0, 0, {}, {}}, // 0x21 illegal cfa
{nullptr, 0, 0, {}, {}}, // 0x22 illegal cfa
{nullptr, 0, 0, {}, {}}, // 0x23 illegal cfa
{nullptr, 0, 0, {}, {}}, // 0x24 illegal cfa
{nullptr, 0, 0, {}, {}}, // 0x25 illegal cfa
{nullptr, 0, 0, {}, {}}, // 0x26 illegal cfa
{nullptr, 0, 0, {}, {}}, // 0x27 illegal cfa
{nullptr, 0, 0, {}, {}}, // 0x28 illegal cfa
{nullptr, 0, 0, {}, {}}, // 0x29 illegal cfa
{nullptr, 0, 0, {}, {}}, // 0x2a illegal cfa
{nullptr, 0, 0, {}, {}}, // 0x2b illegal cfa
{nullptr, 0, 0, {}, {}}, // 0x2c illegal cfa
{nullptr, 0, 0, {}, {}}, // 0x2d DW_CFA_GNU_window_save (Treat as illegal)
{"", 0, 0, {}, {}}, // 0x17 illegal cfa
{"", 0, 0, {}, {}}, // 0x18 illegal cfa
{"", 0, 0, {}, {}}, // 0x19 illegal cfa
{"", 0, 0, {}, {}}, // 0x1a illegal cfa
{"", 0, 0, {}, {}}, // 0x1b illegal cfa
{"", 0, 0, {}, {}}, // 0x1c DW_CFA_lo_user (Treat as illegal)
{"", 0, 0, {}, {}}, // 0x1d illegal cfa
{"", 0, 0, {}, {}}, // 0x1e illegal cfa
{"", 0, 0, {}, {}}, // 0x1f illegal cfa
{"", 0, 0, {}, {}}, // 0x20 illegal cfa
{"", 0, 0, {}, {}}, // 0x21 illegal cfa
{"", 0, 0, {}, {}}, // 0x22 illegal cfa
{"", 0, 0, {}, {}}, // 0x23 illegal cfa
{"", 0, 0, {}, {}}, // 0x24 illegal cfa
{"", 0, 0, {}, {}}, // 0x25 illegal cfa
{"", 0, 0, {}, {}}, // 0x26 illegal cfa
{"", 0, 0, {}, {}}, // 0x27 illegal cfa
{"", 0, 0, {}, {}}, // 0x28 illegal cfa
{"", 0, 0, {}, {}}, // 0x29 illegal cfa
{"", 0, 0, {}, {}}, // 0x2a illegal cfa
{"", 0, 0, {}, {}}, // 0x2b illegal cfa
{"", 0, 0, {}, {}}, // 0x2c illegal cfa
{"", 0, 0, {}, {}}, // 0x2d DW_CFA_GNU_window_save (Treat as illegal)
{
"DW_CFA_GNU_args_size", // 0x2e DW_CFA_GNU_args_size
2,
@ -714,21 +714,21 @@ const DwarfCfaInfo::Info DwarfCfaInfo::kTable[64] = {
{DW_EH_PE_uleb128, DW_EH_PE_uleb128},
{DWARF_DISPLAY_REGISTER, DWARF_DISPLAY_NUMBER},
},
{nullptr, 0, 0, {}, {}}, // 0x31 illegal cfa
{nullptr, 0, 0, {}, {}}, // 0x32 illegal cfa
{nullptr, 0, 0, {}, {}}, // 0x33 illegal cfa
{nullptr, 0, 0, {}, {}}, // 0x34 illegal cfa
{nullptr, 0, 0, {}, {}}, // 0x35 illegal cfa
{nullptr, 0, 0, {}, {}}, // 0x36 illegal cfa
{nullptr, 0, 0, {}, {}}, // 0x37 illegal cfa
{nullptr, 0, 0, {}, {}}, // 0x38 illegal cfa
{nullptr, 0, 0, {}, {}}, // 0x39 illegal cfa
{nullptr, 0, 0, {}, {}}, // 0x3a illegal cfa
{nullptr, 0, 0, {}, {}}, // 0x3b illegal cfa
{nullptr, 0, 0, {}, {}}, // 0x3c illegal cfa
{nullptr, 0, 0, {}, {}}, // 0x3d illegal cfa
{nullptr, 0, 0, {}, {}}, // 0x3e illegal cfa
{nullptr, 0, 0, {}, {}}, // 0x3f DW_CFA_hi_user (Treat as illegal)
{"", 0, 0, {}, {}}, // 0x31 illegal cfa
{"", 0, 0, {}, {}}, // 0x32 illegal cfa
{"", 0, 0, {}, {}}, // 0x33 illegal cfa
{"", 0, 0, {}, {}}, // 0x34 illegal cfa
{"", 0, 0, {}, {}}, // 0x35 illegal cfa
{"", 0, 0, {}, {}}, // 0x36 illegal cfa
{"", 0, 0, {}, {}}, // 0x37 illegal cfa
{"", 0, 0, {}, {}}, // 0x38 illegal cfa
{"", 0, 0, {}, {}}, // 0x39 illegal cfa
{"", 0, 0, {}, {}}, // 0x3a illegal cfa
{"", 0, 0, {}, {}}, // 0x3b illegal cfa
{"", 0, 0, {}, {}}, // 0x3c illegal cfa
{"", 0, 0, {}, {}}, // 0x3d illegal cfa
{"", 0, 0, {}, {}}, // 0x3e illegal cfa
{"", 0, 0, {}, {}}, // 0x3f DW_CFA_hi_user (Treat as illegal)
};
// Explicitly instantiate DwarfCfa.

9
libunwindstack/DwarfCfa.h
View File

@ -49,7 +49,14 @@ class DwarfCfaInfo {
};
struct Info {
const char* name;
// It may seem cleaner to just change the type of 'name' to 'const char *'.
// However, having a pointer here would require relocation at runtime,
// causing 'kTable' to be placed in data.rel.ro section instead of rodata
// section, adding memory pressure to the system. Note that this is only
// safe because this is only used in C++ code. C++ standard, unlike C
// standard, mandates the array size to be large enough to hold the NULL
// terminator when initialized with a string literal.
const char name[36];
uint8_t supported_version;
uint8_t num_operands;
uint8_t operands[2];