Make spvOpcodeString part of the public API (#3174)

Fixes #3138

include/spirv-tools/libspirv.h

@@ -766,6 +766,9 @@ SPIRV_TOOLS_EXPORT void spvDiagnosticDestroy(spv_diagnostic diagnostic);
 SPIRV_TOOLS_EXPORT spv_result_t
 spvDiagnosticPrint(const spv_diagnostic diagnostic);
 
+// Gets the name of an instruction, without the "Op" prefix.
+SPIRV_TOOLS_EXPORT const char* spvOpcodeString(const uint32_t opcode);
+
 // The binary parser interface.
 
 // A pointer to a function that accepts a parsed SPIR-V header.

source/opcode.cpp

@@ -181,11 +181,15 @@ void spvInstructionCopy(const uint32_t* words, const SpvOp opcode,
   }
 }
 
-const char* spvOpcodeString(const SpvOp opcode) {
+const char* spvOpcodeString(const uint32_t opcode) {
   const auto beg = kOpcodeTableEntries;
   const auto end = kOpcodeTableEntries + ARRAY_SIZE(kOpcodeTableEntries);
-  spv_opcode_desc_t needle = {"",    opcode, 0, nullptr, 0,   {},
-                              false, false,  0, nullptr, ~0u, ~0u};
+  spv_opcode_desc_t needle = {"",    static_cast<const SpvOp>(opcode),
+                              0,     nullptr,
+                              0,     {},
+                              false, false,
+                              0,     nullptr,
+                              ~0u,   ~0u};
   auto comp = [](const spv_opcode_desc_t& lhs, const spv_opcode_desc_t& rhs) {
     return lhs.opcode < rhs.opcode;
   };

source/opcode.h

@@ -56,9 +56,6 @@ void spvInstructionCopy(const uint32_t* words, const SpvOp opcode,
                         const uint16_t word_count,
                         const spv_endianness_t endian, spv_instruction_t* inst);
 
-// Gets the name of an instruction, without the "Op" prefix.
-const char* spvOpcodeString(const SpvOp opcode);
-
 // Determine if the given opcode is a scalar type. Returns zero if false,
 // non-zero otherwise.
 int32_t spvOpcodeIsScalarType(const SpvOp opcode);