[Warnings] Changed C String to STD String

GCC sometimes gets confused with how strings are allocated, when they
are C strings allocated by hand. Changed to an std string since it is
easier to work with and removes the warning.

Author: AlexandreSinger

vpr/src/power/power.cpp

@@ -138,7 +138,7 @@ static void power_usage_primitive(t_power_usage* power_usage, t_pb* pb, t_pb_gra
     if (strcmp(pb_graph_node->pb_type->blif_model, MODEL_NAMES) == 0) {
         /* LUT */
 
-        char* SRAM_values;
+        std::string SRAM_values;
         float* input_probabilities;
         float* input_densities;
         int LUT_size;
@@ -174,7 +174,6 @@ static void power_usage_primitive(t_power_usage* power_usage, t_pb* pb, t_pb_gra
                         power_ctx.arch->LUT_transistor_size, SRAM_values,
                         input_probabilities, input_densities, power_ctx.solution_inf.T_crit);
         power_add_usage(power_usage, &sub_power_usage);
-        delete[] SRAM_values;
         delete[] input_probabilities;
         delete[] input_densities;
     } else if (strcmp(pb_graph_node->pb_type->blif_model, MODEL_LATCH) == 0) {

vpr/src/power/power_components.cpp

@@ -23,6 +23,7 @@
 /************************* INCLUDES *********************************/
 #include <cstring>
 #include <cmath>
+#include <string>
 
 #include "vtr_math.h"
 #include "vtr_assert.h"
@@ -203,7 +204,7 @@ void power_usage_ff(t_power_usage* power_usage, float size, float D_prob, float
  * 7 _Z_|
  *
  */
-void power_usage_lut(t_power_usage* power_usage, int lut_size, float transistor_size, char* SRAM_values, float* input_prob, float* input_dens, float period) {
+void power_usage_lut(t_power_usage* power_usage, int lut_size, float transistor_size, std::string SRAM_values, float* input_prob, float* input_dens, float period) {
     float** internal_prob;
     float** internal_dens;
     float** internal_v;

vpr/src/power/power_components.h

@@ -24,6 +24,7 @@
 #define __POWER_COMPONENTS_H__
 
 /************************* INCLUDES *********************************/
+#include <string>
 #include "power.h"
 #include "clustered_netlist.h"
 
@@ -82,7 +83,7 @@ void power_component_add_usage(t_power_usage* power_usage,
 float power_component_get_usage_sum(e_power_component_type component_idx);
 
 void power_usage_ff(t_power_usage* power_usage, float size, float D_prob, float D_dens, float Q_prob, float Q_dens, float clk_prob, float clk_dens, float period);
-void power_usage_lut(t_power_usage* power_usage, int LUT_size, float transistor_size, char* SRAM_values, float* input_densities, float* input_probabilities, float period);
+void power_usage_lut(t_power_usage* power_usage, int LUT_size, float transistor_size, std::string SRAM_values, float* input_densities, float* input_probabilities, float period);
 void power_usage_local_interc_mux(t_power_usage* power_usage, t_pb* pb, t_interconnect_pins* interc_pins, ClusterBlockId iblk);
 void power_usage_mux_multilevel(t_power_usage* power_usage,
                                 t_mux_arch* mux_arch,

vpr/src/power/power_util.cpp

@@ -23,6 +23,7 @@
 #include <cstring>
 #include <cmath>
 #include <map>
+#include <string>
 
 #include "vtr_assert.h"
 #include "vtr_memory.h"
@@ -211,16 +212,13 @@ float calc_buffer_stage_effort(int N, float final_stage_size) {
  *  - LUT_size: The number of LUT inputs
  *  - truth_table: The logic terms saved from the BLIF file
  */
-char* alloc_SRAM_values_from_truth_table(int LUT_size,
-                                         const AtomNetlist::TruthTable& truth_table) {
+std::string alloc_SRAM_values_from_truth_table(int LUT_size,
+                                               const AtomNetlist::TruthTable& truth_table) {
     size_t num_SRAM_bits = 1 << LUT_size;
 
     //SRAM value stored as a string of '0' and '1' characters
     // Initialize to all zeros
-    char* SRAM_values = new char[num_SRAM_bits + 1];
-    for (size_t i = 0; i < num_SRAM_bits + 1; i++)
-        SRAM_values[i] = '0';
-    SRAM_values[num_SRAM_bits] = '\0';
+    std::string SRAM_values(num_SRAM_bits, '0');
 
     if (truth_table.empty()) {
         for (size_t i = 0; i < num_SRAM_bits; i++) {

vpr/src/power/power_util.h

@@ -23,6 +23,7 @@
 #define __POWER_UTIL_H__
 
 /************************* INCLUDES *********************************/
+#include <string>
 #include "power.h"
 #include "power_components.h"
 #include "atom_netlist.h"
@@ -63,8 +64,8 @@ bool power_method_is_transistor_level(e_power_estimation_method estimation_metho
 bool power_method_is_recursive(e_power_estimation_method method);
 
 const char* transistor_type_name(e_tx_type type);
-char* alloc_SRAM_values_from_truth_table(int LUT_size,
-                                         const AtomNetlist::TruthTable& truth_table);
+std::string alloc_SRAM_values_from_truth_table(int LUT_size,
+                                               const AtomNetlist::TruthTable& truth_table);
 float clb_net_density(ClusterNetId net_idx);
 const char* interconnect_type_name(enum e_interconnect type);
 float clb_net_prob(ClusterNetId net_idx);