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https://github.com/JakeHillion/drgn.git
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87b7292aa5
drgn is currently licensed as GPLv3+. Part of the long term vision for drgn is that other projects can use it as a library providing programmatic interfaces for debugger functionality. A more permissive license is better suited to this goal. We decided on LGPLv2.1+ as a good balance between software freedom and permissiveness. All contributors not employed by Meta were contacted via email and consented to the license change. The only exception was the author of commitc4fbf7e589("libdrgn: fix for compilation error"), who did not respond. That commit reverted a single line of code to one originally written by me in commit640b1c011d("libdrgn: embed DWARF index in DWARF info cache"). Signed-off-by: Omar Sandoval <osandov@osandov.com>
107 lines
2.9 KiB
C
107 lines
2.9 KiB
C
// Copyright (c) Meta Platforms, Inc. and affiliates.
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// SPDX-License-Identifier: LGPL-2.1-or-later
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#include <assert.h>
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#include <stdlib.h>
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#include <string.h>
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#include "cfi.h"
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const struct drgn_cfi_row drgn_empty_cfi_row_impl;
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bool drgn_cfi_row_copy(struct drgn_cfi_row **dst,
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const struct drgn_cfi_row *src)
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{
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if (src->num_regs + 1 > (*dst)->allocated_rules) {
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if ((*dst)->allocated_rules == 0 && src->allocated_rules == 0) {
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*dst = (struct drgn_cfi_row *)src;
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return true;
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}
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struct drgn_cfi_row *tmp =
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malloc(sizeof(struct drgn_cfi_row) +
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src->num_regs * sizeof(struct drgn_cfi_rule));
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if (!tmp)
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return false;
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tmp->allocated_rules = src->num_regs + 1;
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drgn_cfi_row_destroy(*dst);
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*dst = tmp;
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}
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(*dst)->num_regs = src->num_regs;
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(*dst)->cfa_rule = src->cfa_rule;
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memcpy((*dst)->reg_rules, src->reg_rules,
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(*dst)->num_regs * sizeof((*dst)->reg_rules[0]));
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return true;
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}
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static bool drgn_cfi_row_reserve(struct drgn_cfi_row **row, uint16_t num_rules)
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{
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if ((*row)->allocated_rules < num_rules) {
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if (num_rules < (*row)->num_regs + 1)
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num_rules = (*row)->num_regs + 1;
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size_t size;
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if (__builtin_mul_overflow((uint16_t)(num_rules - 1),
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sizeof(struct drgn_cfi_rule),
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&size) ||
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__builtin_add_overflow(sizeof(struct drgn_cfi_row), size,
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&size))
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return false;
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struct drgn_cfi_row *tmp;
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if ((*row)->allocated_rules == 0) {
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tmp = malloc(size);
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if (!tmp)
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return false;
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tmp->num_regs = (*row)->num_regs;
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tmp->cfa_rule = (*row)->cfa_rule;
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memcpy(tmp->reg_rules, (*row)->reg_rules,
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tmp->num_regs * sizeof(tmp->reg_rules[0]));
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} else {
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tmp = realloc(*row, size);
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if (!tmp)
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return false;
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}
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tmp->allocated_rules = num_rules;
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*row = tmp;
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}
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return true;
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}
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bool drgn_cfi_row_set_cfa(struct drgn_cfi_row **row,
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const struct drgn_cfi_rule *rule)
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{
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assert(rule->kind != DRGN_CFI_RULE_AT_CFA_PLUS_OFFSET);
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assert(rule->kind != DRGN_CFI_RULE_CFA_PLUS_OFFSET);
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if (!drgn_cfi_row_reserve(row, 1))
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return false;
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(*row)->cfa_rule = *rule;
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return true;
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}
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void drgn_cfi_row_get_register(const struct drgn_cfi_row *row,
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drgn_register_number regno,
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struct drgn_cfi_rule *ret)
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{
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if (regno < row->num_regs)
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*ret = row->reg_rules[regno];
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else
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ret->kind = DRGN_CFI_RULE_UNDEFINED;
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}
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bool drgn_cfi_row_set_register(struct drgn_cfi_row **row,
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drgn_register_number regno,
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const struct drgn_cfi_rule *rule)
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{
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assert(regno <= DRGN_MAX_REGISTER_NUMBER);
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if (!drgn_cfi_row_reserve(row, regno + 2))
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return false;
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if (regno >= (*row)->num_regs) {
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static_assert(DRGN_CFI_RULE_UNDEFINED == 0,
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"DRGN_CFI_RULE_UNDEFINED must be zero");
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memset(&(*row)->reg_rules[(*row)->num_regs], 0,
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(regno - (*row)->num_regs) *
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sizeof((*row)->reg_rules[0]));
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(*row)->num_regs = regno + 1;
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}
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(*row)->reg_rules[regno] = *rule;
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return true;
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}
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